Update README.md

Add support for deeplink for Fractal

.editorconfig

@@ -0,0 +1,14 @@
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+indent_style = space
+indent_size = 4
+
+# Matches multiple files with brace expansion notation
+# Set default charset
+# [*.{js,py}]

.eslintrc.js

@@ -1,7 +1,14 @@
 module.exports = {
-    "extends": [
+    "env": {
-        "matrix-org/ts",
+        "browser": true,
-        "matrix-org/react",
+        "es6": true
-    ],
+    },
-}
+    "extends": "eslint:recommended",
-
+    "parserOptions": {
+        "ecmaVersion": 2020,
+        "sourceType": "module"
+    },
+    "rules": {
+        "no-console": "off"
+    }
+};

.gitignore

@@ -1,31 +1,5 @@
-# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+node_modules
-
+build
-# dependencies
+*.tar.gz
-/node_modules
+/.idea
-/.pnp
-.pnp.js
-
-# testing
-/coverage
-
-# development
-bundle.js
-bundle.js.map
-
-# production
-/build
-
-# misc
 .DS_Store
-.env.local
-.env.development.local
-.env.test.local
-.env.production.local
-
-npm-debug.log*
-yarn-debug.log*
-yarn-error.log*
-
-.vercel
-
-storybook-static

.storybook/preview.js

@@ -1,45 +0,0 @@
-/*
-Copyright 2020 The Matrix.org Foundation C.I.C.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-import React from 'react';
-import { addDecorator } from '@storybook/react';
-import { withA11y } from '@storybook/addon-a11y';
-import { withKnobs } from '@storybook/addon-knobs';
-import { withDesign } from 'storybook-addon-designs'
-import { addParameters } from '@storybook/react';
-
-import SingleColumn from '../src/layouts/SingleColumn';
-
-// Default styles
-import "../src/index.scss";
-
-addDecorator(
-    storyFn => <SingleColumn>{storyFn()}</SingleColumn>
-);
-
-addDecorator(withA11y);
-
-addDecorator(withKnobs);
-
-addDecorator(withDesign);
-
-addParameters({
-    backgrounds: [
-        {name: 'light', value: '#F4F4F4', default: true},
-        {name: 'white', value: '#FFFFFF'},
-    ],
-});
-

CONTRIBUTING.md

@@ -0,0 +1,59 @@
+# Contributing to Matrix.to
+
+Thank you for taking the time to contribute to Matrix!
+
+This is the repository for Matrix.to, a simple url redirection service for the Matrix.org ecosystem which lets users share links to matrix entities without being tied to a specific app.
+
+## Sign off
+
+We ask that everybody who contributes to this project signs off their contributions, as explained below.
+
+We follow a simple 'inbound=outbound' model for contributions: the act of submitting an 'inbound' contribution means that the contributor agrees to license their contribution under the same terms as the project's overall 'outbound' license - in our case, this is Apache Software License v2 (see [LICENSE](./LICENSE)).
+
+In order to have a concrete record that your contribution is intentional and you agree to license it under the same terms as the project's license, we've adopted the same lightweight approach used by the [Linux Kernel](https://www.kernel.org/doc/html/latest/process/submitting-patches.html), [Docker](https://github.com/docker/docker/blob/master/CONTRIBUTING.md), and many other projects: the [Developer Certificate of Origin](https://developercertificate.org/) (DCO). This is a simple declaration that you wrote the contribution or otherwise have the right to contribute it to Matrix:
+
+```
+Developer Certificate of Origin
+Version 1.1
+
+Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
+660 York Street, Suite 102,
+San Francisco, CA 94110 USA
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+Developer's Certificate of Origin 1.1
+
+By making a contribution to this project, I certify that:
+
+(a) The contribution was created in whole or in part by me and I
+    have the right to submit it under the open source license
+    indicated in the file; or
+
+(b) The contribution is based upon previous work that, to the best
+    of my knowledge, is covered under an appropriate open source
+    license and I have the right under that license to submit that
+    work with modifications, whether created in whole or in part
+    by me, under the same open source license (unless I am
+    permitted to submit under a different license), as indicated
+    in the file; or
+
+(c) The contribution was provided directly to me by some other
+    person who certified (a), (b) or (c) and I have not modified
+    it.
+
+(d) I understand and agree that this project and the contribution
+    are public and that a record of the contribution (including all
+    personal information I submit with it, including my sign-off) is
+    maintained indefinitely and may be redistributed consistent with
+    this project or the open source license(s) involved.
+```
+
+If you agree to this for your contribution, then all that's needed is to include the line in your commit or pull request comment:
+
+```
+Signed-off-by: Your Name <your@email.example.org>
+```
+
+Git allows you to add this signoff automatically when using the `-s` flag to `git commit`, which uses the name and email set in your `user.name` and `user.email` git configs.

Dockerfile

@@ -0,0 +1,19 @@
+FROM node:latest
+
+# Set working directory
+WORKDIR /app
+
+# Copy package files first to leverage Docker cache
+COPY package.json yarn.lock ./
+
+# Install dependencies
+RUN yarn install
+
+# Copy the rest of the application
+COPY . .
+
+# Expose port 5000
+EXPOSE 5000
+
+# Start the application
+CMD ["yarn", "start"]

LICENSE

@@ -0,0 +1,177 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
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+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
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+
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+      the original version of the Work and any modifications or additions
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+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
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+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
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+      on Your own behalf and on Your sole responsibility, not on behalf
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+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS

README.md

@@ -1,10 +1,54 @@
-# Matrix.to
+# dm.sij.law
+This repo is cloned from the official Matrix.to repo on Github. I've added a Dockerfile and will make modifications in the future. The current version is live at [dm.sij.law](https://dm.sij.law)
+
+## First clone the repo
+```bash
+git clone https://sij.ai/sij/env.esq.git
+```
+
+## Next build the image
+```bash
+docker build -t matrix-to .
+```
+
+## Then run it
+```bash
+docker run -d \
+  --name matrix-to \
+  -p 3636:5000 \
+  matrix-to
+```
+
+# EVERYTHING BELOW HERE IS ORIGINAL DOCUMENTATION
+
+## Matrix.to
 
 Matrix.to is a simple url redirection service for the Matrix.org ecosystem
 which lets users share links to matrix entities without being tied to a
 specific app.
 Stylistically it serves as a landing page for rooms and communities.
 
+## How can I put a badge on my website linking to my matrix room?
+
+You can use the badge image we've put up at https://matrix.to/img/matrix-badge.svg, and use it in a link like this:
+
+[![Chat on Matrix](https://matrix.to/img/matrix-badge.svg)](https://matrix.to/#/#matrix.to:matrix.org)
+
+You can use this Markdown:
+```md
+[![Chat on Matrix](https://matrix.to/img/matrix-badge.svg)](https://matrix.to/#/#matrix.to:matrix.org)
+```
+
+Or this HTML:
+
+```html
+<a href="https://matrix.to/#/#matrix.to:matrix.org" rel="noopener" target="_blank"><img src="https://matrix.to/img/matrix-badge.svg" alt="Chat on Matrix"></a>
+```
+
+to show the badge.
+
+## How does matrix.to work?
+
 Matrix.to preserves user privacy by not sharing any information about the links
 being followed with the Matrix.to server - the redirection is calculated
 entirely clientside using JavaScript, and the link details is hidden behind a
@@ -21,6 +65,8 @@ point at an alternative deployment of the service.  The Matrix.to service could
 also be hosted in an immutable/signed environment such as IPFS to further
 increase its availability and avoid tampering.
 
+## URL Scheme
+
 The matrix.to URL scheme is
 
 | Entity type: | Example URL                                                       |
@@ -40,10 +86,23 @@ visitors.
 (Technically the # and @ in the URL fragment should probably be escaped, but in
 practice for legibility we bend the rules and include it verbatim)
 
+### Optional parameters
+
+https://matrix.to/#/#matrix:matrix.org?web-instance[element.io]=chat.mozilla.org
+
+- `client`, e.g. `client=im.fluffychat`, `client=element.io`
+- `web-instance[]`, e.g. `web-instance[element.io]=chat.mozilla.org`.
+    - For [matrix.to](https://matrix.to/), we have a list of [trusted web instances configured](src/open/clients/Element.js) (see `trustedWebInstances`).
+-  `via`, e.g. `via=mozilla.org`
+
 You can discuss matrix.to in
 [`#matrix.to:matrix.org`](https://matrix.to/#/#matrix.to:matrix.org)
 
-A development build of matrix-two can be found at https://matrix-to.vercel.app
+## Build Instructions
 
-A preview of all components can be found at
+1. Install [yarn](https://classic.yarnpkg.com/en/docs/install)
-https://matrix-to-storybook.vercel.app
+1. `git clone https://github.com/matrix-org/matrix.to`
+1. `cd matrix.to`
+1. `yarn`
+1. `yarn start`
+1. Go to http://localhost:5000 in your browser

css/client.css

@@ -0,0 +1,98 @@
+.ClientListView h2 {
+    text-align: center;
+    margin: 18px 0;
+}
+
+.ClientListView .filterOption {
+    display: flex;
+    align-items: center;
+    margin: 8px 0;
+}
+
+.ClientView {
+    border: 1px solid #E6E6E6;
+    border-radius: 8px;
+    margin: 16px 0;
+    padding: 16px;
+}
+
+.ClientView.isPreferred {
+    border: 3px solid var(--link);
+    box-shadow: 0px 8px 4px rgba(0, 0, 0, 0.05);
+}
+
+.ClientView .hostedBanner {
+    text-align: center;
+    margin-bottom: 29px;
+    padding: 4px 0;
+    line-height: 20px;
+    border-radius: 8px;
+    font-weight: bold;
+    font-size: 16px;
+    background-color: var(--lightgrey);
+}
+
+.ClientView .header {
+    display: flex;
+}
+
+.ClientView .description {
+    flex: 1;
+}
+
+.ClientView h3 {
+    margin-top: 0;
+}
+
+.ClientView .clientIcon {
+    border-radius: 8px;
+    background-repeat: no-repeat;
+    background-size: cover;
+    width: 60px;
+    height: 60px;
+    overflow: hidden;
+    display: block;
+    margin-left: 16px;
+}
+
+.ClientView .platforms {
+    background-image: url('../images/platform-icon.svg');
+    background-repeat: no-repeat;
+    background-position: 0 center;
+    padding-left: 28px;
+}
+
+.ClientView .actions a.badge {
+    display: inline-block;
+    height: 40px;
+    margin: 8px 16px 8px 0;
+}
+
+.ClientView .actions img {
+    height: 100%;
+}
+
+.ClientView .back {
+    margin-top: 22px;
+}
+
+.InstallClientView .instructions button {
+    background-repeat: no-repeat;
+    background-position: center;
+    background-color: transparent;
+    padding: 4px;
+    border: none;
+    width: 24px;
+    height: 24px;
+    margin: 8px;
+    vertical-align: middle;
+}
+
+.InstallClientView .instructions button.copy {
+    background-image: url('../images/copy.svg');
+}
+
+.InstallClientView .instructions button.tick {
+    background-image: url('../images/tick-dark.svg');
+}
+

css/create.css

@@ -0,0 +1,13 @@
+.CreateLinkView h2 {
+    padding: 0 40px;
+    word-break: break-all;
+    text-align: center;
+}
+
+.CreateLinkView form {
+    margin-top: 36px;
+}
+
+.CreateLinkView form > *:not(:first-child) {
+    margin-top: 24px;
+}

css/main.css

@@ -0,0 +1,223 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+@import url('spinner.css');
+@import url('client.css');
+@import url('preview.css');
+@import url('create.css');
+@import url('open.css');
+
+:root {
+    --app-background: #f4f4f4;
+    --background: #ffffff;
+    --foreground: #000000;
+    --font: #333333;
+    --grey: #666666;
+    --accent: #0098d4;
+    --error: #d6001c;
+    --link: #0098d4;
+    --borders: #f4f4f4;
+    --lightgrey: #E6E6E6;
+    --spinner-stroke-size: 2px;
+}
+
+html {
+    margin: 0;
+    padding: 0;
+}
+
+body {
+    background-color: var(--app-background);
+    background-image: url('../images/background.svg');
+    background-attachment: fixed;
+    background-repeat: no-repeat;
+    background-size: auto;
+    background-position: center -50px;
+    height: 100%;
+    width: 100%;
+    font-size: 14px;
+    color: var(--font);
+    padding: 120px 0 0 0;
+    margin: 0;
+}
+
+noscript {
+    display: block;
+    padding: 20px;
+}
+
+p { line-height: 150%; }
+a { text-decoration: none; }
+
+h1 { font-size: 24px; }
+h2 { font-size: 21px; }
+h3 { font-size: 16px; }
+
+body,
+button,
+input,
+textarea {
+    font-family: Helvetica Neue, Helvetica, Arial, sans-serif;
+    font-style: normal;
+}
+
+button, input[type=submit] {
+    cursor: pointer;
+}
+
+button, input {
+    font-size: inherit;
+    font-weight: inherit;
+}
+
+input[type="checkbox"], input[type="radio"] {
+    margin: 0 8px 0 0;
+}
+
+.RootView {
+    margin: 0 auto;
+    max-width: 480px;
+    width: 100%;
+}
+
+.card {
+    background-color: var(--background);
+    border-radius: 16px;
+    box-shadow: 0px 18px 24px rgba(0, 0, 0, 0.06);
+}
+
+.card, .footer {
+    padding: 2rem;
+}
+
+.hidden {
+    display: none !important;
+}
+
+
+@media screen and (max-width: 480px) {
+    body {
+        background-image: none;
+        background-color: var(--background);
+        padding: 0;
+    }
+
+    .card {
+        border-radius: unset;
+        box-shadow: unset;
+    }
+}
+
+.footer .links li:not(:first-child) {
+    margin-left: 0.5em;
+}
+
+.footer .links li:not(:first-child)::before {
+    content: "·";
+    margin-right: 0.5em;
+}
+
+.footer .links li {
+    display: inline-block;
+}
+
+.footer .links {
+    font-size: 12px;
+    list-style: none;
+    padding: 0;
+}
+
+a, button.text {
+    color: var(--link);
+}
+
+button.text {
+    background: none;
+    border: none;
+    font-style: normal;
+    font-weight: normal;
+    font-size: inherit;
+    padding: 8px 0;
+    margin: -8px 0;
+}
+
+button.text:hover {
+    cursor: pointer;
+}
+
+.primary, .secondary {
+    text-decoration: none;
+    font-weight: bold;
+    text-align: center;
+    padding: 12px 8px;
+    margin: 8px 0;
+}
+
+.secondary {
+    background: var(--background);
+    color: var(--link);
+    border: 1px solid var(--link);
+    border-radius: 32px;
+}
+
+.primary {
+    background: var(--link);
+    color: var(--background);
+    border-radius: 32px;
+}
+
+.primary.icon, .secondary.icon {
+    background-repeat: no-repeat;
+    background-position: 12px center;
+}
+
+.icon.link { background-image: url('../images/link.svg'); }
+.icon.tick { background-image: url('../images/tick.svg'); }
+.icon.copy { background-image: url('../images/copy.svg'); }
+
+button.primary, input[type='submit'].primary, button.secondary, input[type='submit'].secondary {
+    border: none;
+    font-size: inherit;
+}
+
+input[type='text'].large {
+    width: 100%;
+    padding: 12px;
+    background: var(--background);
+    border: 1px solid var(--foreground);
+    border-radius: 16px;
+    font-size: 14px;
+}
+
+.fullwidth {
+    display: block;
+    width: 100%;
+    box-sizing: border-box;
+}
+
+.LoadServerPolicyView {
+    display: flex;
+}
+
+.LoadServerPolicyView .spinner {
+    width: 32px;
+    height: 32px;
+    margin-right: 12px;
+}
+
+.LoadServerPolicyView h2 {
+    margin-top: 0;
+}

css/open.css

@@ -0,0 +1,52 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+.OpenLinkView .caption {
+    color: var(--grey);
+    font-size: 12px;
+}
+
+.ServerConsentView .actions label {
+    display: flex;
+    align-items: center;
+}
+
+.ServerConsentView .actions {
+    margin-top: 24px;
+    display: flex;
+    align-items: center;
+}
+
+.ServerConsentView input[type=submit] {
+    flex: 1;
+    margin-left: 32px;
+}
+
+.ServerOptions div {
+    margin: 8px 0;
+}
+
+.ServerOptions label {
+    display: flex;
+    align-items: center;
+}
+
+.ServerOptions label > .line {
+    flex: 1;
+    border: none;
+    border-bottom: 1px solid var(--grey);
+    padding: 4px 0;
+}

css/preview.css

@@ -0,0 +1,133 @@
+.PreviewView {
+    text-align: center;
+    margin-bottom: 32px;
+}
+
+.PreviewView h1 {
+    font-size: 24px;
+    line-height: 32px;
+    margin-bottom: 8px;
+    word-wrap: anywhere;
+}
+
+.PreviewView .avatarContainer {
+    display: flex;
+    justify-content: center;
+    margin: 0;
+}
+
+.PreviewView .avatar {
+    border-radius: 100%;
+    width: 64px;
+    height: 64px;
+}
+
+.PreviewView .mxSpace .avatar {
+    border-radius: 12px;
+}
+
+.PreviewView .defaultAvatar {
+    width: 64px;
+    height: 64px;
+    background-image: url('../images/chat-icon.svg');
+    background-repeat: no-repeat;
+    background-position: center;
+    background-size: 85%;
+}
+
+.PreviewView .spinner {
+    width: 32px;
+    height: 32px;
+}
+
+.PreviewView .avatar.loading {
+    border: 1px solid #eee;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    box-sizing: border-box;
+}
+
+.PreviewView .identifier {
+    color: var(--grey);
+    font-size: 12px;
+    margin: 8px 0;
+}
+
+.PreviewView .identifier.placeholder {
+    height: 1em;
+    margin: 1em 30%;
+}
+
+.PreviewView .memberCount {
+    display: flex;
+    justify-content: center;
+    margin: 8px 0;
+}
+
+.PreviewView .memberCount.loading {
+    margin: 16px 0;
+}
+
+.PreviewView .memberCount p {
+    font-size: 12px;
+    margin: 0;
+}
+
+.PreviewView .memberCount p:not(.placeholder) {
+    padding: 4px 8px 4px 24px;
+    border-radius: 14px;
+    background-image: url(../images/member-icon.svg);
+    background-repeat: no-repeat;
+    background-position: 2px center;
+    background-color: var(--lightgrey);
+}
+
+.PreviewView .memberCount p.placeholder {
+    height: 1.5em;
+    width: 100px;
+}
+
+.PreviewView .topic {
+    font-size: 12px;
+    color: var(--grey);
+    margin: 32px 0;
+}
+
+.PreviewView .topic.loading {
+    display: block;
+    margin: 24px 12px;
+    padding: 4px 0;
+}
+
+.PreviewView .topic.loading .placeholder {
+    height: 0.8em;
+    display: block;
+    margin: 12px 0;
+}
+
+.PreviewView .topic.loading .placeholder:nth-child(2) {
+    margin-left: 5%;
+    margin-right: 5%;
+}
+
+.placeholder {
+    border-radius: 1em;
+    --flash-bg: #ddd;
+    --flash-fg: #eee;
+    background: linear-gradient(120deg,
+        var(--flash-bg),
+        var(--flash-bg) 10%,
+        var(--flash-fg) calc(10% + 25px),
+        var(--flash-bg) calc(10% + 50px)
+    );
+    animation: flash 2s linear infinite;
+    background-size: 200%;
+}
+
+@keyframes flash {
+    0% { background-position-x: 0; }
+    50% { background-position-x: -80%; }
+    51% { background-position-x: 80%; }
+    100% { background-position-x: 0%; }
+}

css/spinner.css

@@ -0,0 +1,27 @@
+@keyframes rotate {
+  0% { transform: rotate(0deg); }
+  100% { transform: rotate(360deg); }
+}
+
+.spinner {
+    width: 40px;
+    height: 40px;
+    border-radius: 100%;
+    border: var(--spinner-stroke-size) solid var(--app-background);
+    box-sizing: border-box;
+}
+
+.spinner::before {
+    content: "";
+    display: block;
+    width: inherit;
+    height: inherit;
+    border-radius: 100%;
+    border-width: var(--spinner-stroke-size);
+    border-style: solid;
+    border-color: transparent;
+    border-top-color: var(--grey);
+    animation: rotate 0.8s linear infinite;
+    box-sizing: border-box;
+    margin: calc(-1 * var(--spinner-stroke-size));
+}

docker-compose.yaml

@@ -0,0 +1,6 @@
+version: '3'
+services:
+  matrix-to:
+    build: .
+    ports:
+      - "3636:5000"

images-nohash/matrix-badge.svg

@@ -0,0 +1,20 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="99" height="20">
+<linearGradient id="b" x2="0" y2="100%">
+  <stop offset="0" stop-color="#bbb" stop-opacity=".1"/>
+  <stop offset="1" stop-opacity=".1"/>
+</linearGradient>
+<mask id="a">
+  <rect width="99" height="20" rx="3" fill="#fff"/>
+</mask>
+<g mask="url(#a)">
+  <path fill="#555" d="M0 0h42v20H0z"/>
+  <path fill="#46BC99" d="M42 0h59v20H42z"/>
+  <path fill="url(#b)" d="M0 0h99v20H0z"/>
+</g>
+<g fill="#fff" text-anchor="middle" font-family="DejaVu Sans,Verdana,Geneva,sans-serif" font-size="11">
+  <text x="21" y="15" fill="#010101" fill-opacity=".3">matrix</text>
+  <text x="21" y="14">matrix</text>
+  <text x="68.5" y="15" fill="#010101" fill-opacity=".3">join chat</text>
+  <text x="68.5" y="14">join chat</text>
+</g>
+</svg>

images/background.svg

@@ -0,0 +1,226 @@
+<svg width="1440" height="1505" viewBox="0 0 1440 1505" fill="none" xmlns="http://www.w3.org/2000/svg">
+<g clip-path="url(#clip0)">
+<g>
+<path opacity="0.26" d="M1027.99 602.979C1262.01 860.194 1465.48 1242.7 1528.69 1544.36C1592.2 1847.63 1503.31 2018.17 1310.8 1964.61C1117.48 1910.83 851.081 1638.68 658.35 1297.66C466.355 957.9 378.93 607.541 443.1 434.715C506.167 264.833 707.508 296.249 938.653 512.115C968.31 539.852 998.261 570.239 1027.99 602.979Z" stroke="url(#paint0_linear)" stroke-opacity="0.5" stroke-miterlimit="10"/>
+<path opacity="0.26" d="M1044.18 604.303C1277.61 867.698 1476.23 1255.51 1532.89 1558.78C1589.85 1863.67 1493.74 2031.71 1297.33 1973.07C1100.11 1914.14 833.789 1635 645.032 1288.91C457.01 944.068 376.871 591.501 447.59 420.442C517.133 252.325 723.184 289.112 954.844 511.085C984.648 539.632 1014.53 570.827 1044.18 604.303Z" stroke="url(#paint1_linear)" stroke-opacity="0.5" stroke-miterlimit="10"/>
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images/platform-icon.svg

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+<svg width="22" height="22" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M13.358 14.752H4.97a1.048 1.048 0 01-1.047-1.048V6.286c0-.579.469-1.048 1.047-1.048H17.08c.579 0 1.048.47 1.048 1.048v1.33M11.424 15.152v1.21M9.304 16.362h3.653" stroke="#666" stroke-width=".8" stroke-linecap="round" stroke-linejoin="round"/><rect x="14.543" y="8.955" width="3.914" height="7.371" rx=".648" stroke="#666" stroke-width=".8"/><path stroke="#666" stroke-width=".8" d="M16.028 15.174h1.048"/></svg>

images/tick-dark.svg

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+<svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M5.5 12.5L8.84497 15.845C9.71398 16.714 11.1538 16.601 11.8767 15.6071L18.5 6.5" stroke="#333" stroke-width="2" stroke-linecap="round"/>
+</svg>

images/tick.svg

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+<svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M5.5 12.5L8.84497 15.845C9.71398 16.714 11.1538 16.601 11.8767 15.6071L18.5 6.5" stroke="white" stroke-width="2" stroke-linecap="round"/>
+</svg>

index.html

@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>You're invited to talk on Matrix</title>
+    <meta name="description" content="You're invited to talk on Matrix">
+    <meta name="viewport" content="width=device-width, user-scalable=no">
+    <link rel="stylesheet" type="text/css" href="css/main.css">
+    <meta property="twitter:card" content="summary"/>
+    <meta property="twitter:image" content="https://matrix.org/blog/img/matrix-logo.png"/>
+	<meta property="twitter:site" content="@matrixdotorg"/>
+	<meta property="twitter:title" content="Matrix - Decentralised and secure communication"/>
+	<meta property="twitter:description" content="You're invited to talk on Matrix. If you don't already have a client this link will help you pick one, and join the conversation. If you already have one, this link will help you join the conversation"/>
+</head>
+<body>
+    <script id="main" type="module">
+        import {main} from "./src/main.js";
+        main(document.body);
+    </script>
+    <noscript>
+        <h1>Please enable javascript</h1>
+        <p>Matrix.to is a preview service from chat rooms, people and communities on <a href="https://matrix.org">Matrix</a>.</p>
+        <p>It preserves your privacy by only processing what you view on the client side. For this to work, it needs javascript.</p>
+    </noscript>
+</body>
+</html>

package.json

@@ -1,4 +1,37 @@
 {
-    "name": "matrix.to",
+  "name": "matrix.to",
-    "version": "1.1.3",
+  "version": "1.2.17",
+  "type": "module",
+  "license": "Apache-2.0",
+  "engines": {
+    "node": ">= 14.0.0"
+  },
+  "scripts": {
+    "start": "node scripts/serve-local.js",
+    "build": "node scripts/build.js"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.11.1",
+    "@babel/preset-env": "^7.11.0",
+    "@rollup/plugin-babel": "^5.1.0",
+    "@rollup/plugin-commonjs": "^15.0.0",
+    "@rollup/plugin-multi-entry": "^4.0.0",
+    "@rollup/plugin-node-resolve": "^9.0.0",
+    "@rollup/plugin-replace": "^2.3.4",
+    "autoprefixer": "^10.0.1",
+    "cheerio": "^1.0.0-rc.3",
+    "core-js": "^3.6.5",
+    "finalhandler": "^1.1.2",
+    "mdn-polyfills": "^5.20.0",
+    "postcss": "^8.4.31",
+    "postcss-css-variables": "^0.17.0",
+    "postcss-flexbugs-fixes": "^4.2.1",
+    "postcss-import": "^12.0.1",
+    "postcss-url": "^8.0.0",
+    "regenerator-runtime": "^0.13.7",
+    "rollup": "^2.26.4",
+    "rollup-plugin-terser": "^7.0.2",
+    "serve-static": "^1.14.1",
+    "xxhashjs": "^0.2.2"
+  }
 }

scripts/build.js

@@ -0,0 +1,307 @@
+/*
+Copyright 2020 Bruno Windels <bruno@windels.cloud>
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import cheerio from "cheerio";
+import fs from "fs/promises";
+import path from "path";
+import xxhash from 'xxhashjs';
+import { rollup } from 'rollup';
+import postcss from "postcss";
+import postcssImport from "postcss-import";
+// needed for legacy bundle
+import babel from '@rollup/plugin-babel';
+// needed to find the polyfill modules in the main-legacy.js bundle
+import { nodeResolve } from '@rollup/plugin-node-resolve';
+// needed because some of the polyfills are written as commonjs modules
+import commonjs from '@rollup/plugin-commonjs';
+// multi-entry plugin so we can add polyfill file to main
+import multi from '@rollup/plugin-multi-entry';
+import { terser } from "rollup-plugin-terser";
+import replace from "@rollup/plugin-replace";
+// replace urls of asset names with content hashed version
+import postcssUrl from "postcss-url";
+import cssvariables from "postcss-css-variables";
+import autoprefixer from "autoprefixer";
+import flexbugsFixes from "postcss-flexbugs-fixes";
+
+import {createClients} from "../src/open/clients/index.js";
+
+import { fileURLToPath } from 'url';
+import { dirname } from 'path';
+const projectDir = path.join(dirname(fileURLToPath(import.meta.url)), "../");
+
+async function build() {
+    // get version number
+    const version = JSON.parse(await fs.readFile(path.join(projectDir, "package.json"), "utf8")).version;
+    // clear target dir
+    const targetDir = path.join(projectDir, "build/");
+    await removeDirIfExists(targetDir);
+    await fs.mkdir(targetDir);
+    await fs.mkdir(path.join(targetDir, "images"));
+    await fs.mkdir(path.join(targetDir, "img")); // contains the badge image for historical reasons, unhashed
+    await fs.mkdir(path.join(targetDir, ".well-known"));
+    const assets = new AssetMap(targetDir);
+    const imageAssets = await copyFolder(path.join(projectDir, "images"), path.join(targetDir, "images"));
+    assets.addSubMap(imageAssets);
+    await assets.write(`bundle.js`, await buildJs("src/main.js", assets, ["src/polyfill.js"]));
+    await assets.write(`bundle.css`, await buildCss("css/main.css", targetDir, assets));
+    await assets.writeUnhashed(".well-known/apple-app-site-association", buildAppleAssociatedAppsFile(createClients()));
+    await assets.writeUnhashed("index.html", await buildHtml(assets));
+    await assets.writeUnhashed("img/matrix-badge.svg", await fs.readFile(path.join(projectDir, "images-nohash/matrix-badge.svg")));
+    const globalHash = assets.hashForAll();
+    console.log(`built matrix.to ${version} (${globalHash}) successfully with ${assets.size} files`);
+}
+
+async function buildHtml(assets) {
+    const devHtml = await fs.readFile(path.join(projectDir, "index.html"), "utf8");
+    const doc = cheerio.load(devHtml);
+    doc("link[rel=stylesheet]").attr("href", assets.resolve(`bundle.css`));
+    const mainScripts = [
+        // this is needed to avoid hitting https://github.com/facebook/regenerator/issues/378
+        // which prevents the whole bundle to load, as our CSP headers don't allow unsafe-eval
+        // and I preferred this over disabling strict mode for the whole bundle
+        `<script type="text/javascript">window.regeneratorRuntime = undefined;</script>`,
+        `<script type="text/javascript" src="${assets.resolve(`bundle.js`)}"></script>`,
+        `<script type="text/javascript">bundle.main(document.body);</script>`
+    ];
+    doc("script#main").replaceWith(mainScripts.join(""));
+    return doc.html();
+}
+
+function createReplaceUrlPlugin(assets) {
+    const replacements = {};
+    for (const [key, value] of assets) {
+        replacements[key] = value;
+    }
+    return replace(replacements);
+}
+
+async function buildJs(mainFile, assets, extraFiles = []) {
+    // compile down to whatever IE 11 needs
+    const babelPlugin = babel.babel({
+        babelHelpers: 'bundled',
+        exclude: 'node_modules/**',
+        presets: [
+            [
+                "@babel/preset-env",
+                {
+                    useBuiltIns: "entry",
+                    corejs: "3",
+                    targets: "IE 11",
+                }
+            ]
+        ]
+    });
+    // create js bundle
+    const rollupConfig = {
+        // important the extraFiles come first,
+        // so polyfills are available in the global scope
+        // if needed for the mainfile
+        input: extraFiles.concat(mainFile),
+        plugins: [multi(), commonjs(), nodeResolve(), createReplaceUrlPlugin(assets), babelPlugin, terser()]
+    };
+    const bundle = await rollup(rollupConfig);
+    const {output} = await bundle.generate({
+        format: 'iife',
+        name: `bundle`
+    });
+    const code = output[0].code;
+    return code;
+}
+
+function buildAppleAssociatedAppsFile(clients) {
+    const appIds = clients.map(c => c.appleAssociatedAppId).flat().filter(id => !!id);
+    return JSON.stringify({
+        "applinks": {
+            "details": [
+                {
+                    appIDs: appIds,
+                    components: [
+                        {
+                            "#": "/*",
+                            "comment": "Only open urls with a fragment, so you can still create links"
+                        }
+                    ]
+                }
+            ]
+        }
+    });
+}
+
+async function buildCss(entryPath, targetDir, assets) {
+    entryPath = path.join(projectDir, entryPath);
+    const assetUrlMapper = ({absolutePath}) => {
+        const relPath = absolutePath.slice(projectDir.length);
+        return assets.resolve(path.join(targetDir, relPath));
+    };
+
+    const preCss = await fs.readFile(entryPath, "utf8");
+    const options = [
+        postcssImport,
+        cssvariables(),
+        autoprefixer({overrideBrowserslist: ["IE 11"], grid: "no-autoplace"}),
+        flexbugsFixes(),
+        postcssUrl({url: assetUrlMapper}),
+    ];
+    const cssBundler = postcss(options);
+    const result = await cssBundler.process(preCss, {from: entryPath});
+    return result.css;
+}
+
+async function removeDirIfExists(targetDir) {
+    try {
+        await fs.rmdir(targetDir, {recursive: true});
+    } catch (err) {
+        if (err.code !== "ENOENT") {
+            throw err;
+        }
+    }
+}
+
+async function copyFolder(srcRoot, dstRoot, filter = null, assets = null) {
+    assets = assets || new AssetMap(dstRoot);
+    const dirEnts = await fs.readdir(srcRoot, {withFileTypes: true});
+    for (const dirEnt of dirEnts) {
+        const dstPath = path.join(dstRoot, dirEnt.name);
+        const srcPath = path.join(srcRoot, dirEnt.name);
+        if (dirEnt.isDirectory()) {
+            await fs.mkdir(dstPath);
+            await copyFolder(srcPath, dstPath, filter, assets);
+        } else if ((dirEnt.isFile() || dirEnt.isSymbolicLink()) && (!filter || filter(srcPath))) {
+            const content = await fs.readFile(srcPath);
+            await assets.write(dstPath, content);
+        }
+    }
+    return assets;
+}
+
+function contentHash(str) {
+    var hasher = new xxhash.h32(0);
+    hasher.update(str);
+    return hasher.digest();
+}
+
+class AssetMap {
+    constructor(targetDir) {
+        // remove last / if any, so substr in create works well
+        this._targetDir = path.resolve(targetDir);
+        this._assets = new Map();
+        // hashes for unhashed resources so changes in these resources also contribute to the hashForAll
+        this._unhashedHashes = [];
+    }
+
+    _toRelPath(resourcePath) {
+        let relPath = resourcePath;
+        if (path.isAbsolute(resourcePath)) {
+            if (!resourcePath.startsWith(this._targetDir)) {
+                throw new Error(`absolute path ${resourcePath} that is not within target dir ${this._targetDir}`);
+            }
+            relPath = resourcePath.slice(this._targetDir.length + 1); // + 1 for the /
+        }
+        return relPath;
+    }
+
+    _create(resourcePath, content) {
+        const relPath = this._toRelPath(resourcePath);
+        const hash = contentHash(Buffer.from(content));
+        const dir = path.dirname(relPath);
+        const extname = path.extname(relPath);
+        const basename = path.basename(relPath, extname);
+        const dstRelPath = path.join(dir, `${basename}-${hash}${extname}`);
+        this._assets.set(relPath, dstRelPath);
+        return dstRelPath;
+    }
+
+    async write(resourcePath, content) {
+        const relPath = this._create(resourcePath, content);
+        const fullPath = path.join(this.directory, relPath);
+        if (typeof content === "string") {
+            await fs.writeFile(fullPath, content, "utf8");
+        } else {
+            await fs.writeFile(fullPath, content);
+        }
+        return relPath;
+    }
+
+    async writeUnhashed(resourcePath, content) {
+        const relPath = this._toRelPath(resourcePath);
+        this._assets.set(relPath, relPath);
+        const fullPath = path.join(this.directory, relPath);
+        if (typeof content === "string") {
+            await fs.writeFile(fullPath, content, "utf8");
+        } else {
+            await fs.writeFile(fullPath, content);
+        }
+        return relPath;
+    }
+
+    get directory() {
+        return this._targetDir;
+    }
+
+    resolve(resourcePath) {
+        const relPath = this._toRelPath(resourcePath);
+        const result = this._assets.get(relPath);
+        if (!result) {
+            throw new Error(`unknown path: ${relPath}, only know ${Array.from(this._assets.keys()).join(", ")}`);
+        }
+        return result;
+    }
+
+    addSubMap(assetMap) {
+        if (!assetMap.directory.startsWith(this.directory)) {
+            throw new Error(`map directory doesn't start with this directory: ${assetMap.directory} ${this.directory}`);
+        }
+        const relSubRoot = assetMap.directory.slice(this.directory.length + 1);
+        for (const [key, value] of assetMap._assets.entries()) {
+            this._assets.set(path.join(relSubRoot, key), path.join(relSubRoot, value));
+        }
+    }
+
+    [Symbol.iterator]() {
+        return this._assets.entries();
+    }
+
+    isUnhashed(relPath) {
+        const resolvedPath = this._assets.get(relPath);
+        if (!resolvedPath) {
+            throw new Error("Unknown asset: " + relPath);
+        }
+        return relPath === resolvedPath;
+    }
+
+    get size() {
+        return this._assets.size;
+    }
+
+    has(relPath) {
+        return this._assets.has(relPath);
+    }
+
+    hashForAll() {
+        const globalHashAssets = Array.from(this).map(([, resolved]) => resolved);
+        globalHashAssets.push(...this._unhashedHashes);
+        globalHashAssets.sort();
+        return contentHash(globalHashAssets.join(","));
+    }
+
+    addToHashForAll(resourcePath, content) {
+        this._unhashedHashes.push(`${resourcePath}-${contentHash(Buffer.from(content))}`);
+    }
+}
+
+build().catch(err => console.error(err));

scripts/package.sh

@@ -0,0 +1,8 @@
+set -e
+VERSION=$(jq -r ".version" package.json)
+PACKAGE=matrixto-$VERSION.tar.gz
+yarn build
+pushd build
+tar -czvf ../$PACKAGE ./
+popd
+echo $PACKAGE

scripts/serve-local.js

@@ -0,0 +1,48 @@
+/*
+Copyright 2020 Bruno Windels <bruno@windels.cloud>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import finalhandler from "finalhandler"
+import http from "http"
+import serveStatic from "serve-static"
+import path from "path"
+import { fileURLToPath } from "url";
+const projectDir = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "../");
+
+// Serve up parent directory with cache disabled
+const serve = serveStatic(
+    projectDir,
+    {
+        etag: false,
+        setHeaders: res => {
+            res.setHeader("Pragma", "no-cache");
+            res.setHeader("Cache-Control", "no-cache, no-store, must-revalidate");
+            res.setHeader("Expires", "Wed, 21 Oct 2015 07:28:00 GMT");
+            // same CSP as matrix.to server is using, so local testing happens under similar environment
+            res.setHeader("Content-Security-Policy", "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src * data:; connect-src *; font-src 'self'; manifest-src 'self'; form-action 'self'; navigate-to *;");
+        },
+        index: ['index.html', 'index.htm']
+    }
+);
+ 
+// Create server
+const server = http.createServer(function onRequest (req, res) {
+    console.log(req.method, req.url);
+    serve(req, res, finalhandler(req, res))
+});
+
+// Listen
+server.listen(5000);
+console.log("Listening on port 5000");

src/InvalidUrlView.js

@@ -0,0 +1,56 @@
+/*
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {TemplateView} from "./utils/TemplateView.js";
+import {LinkKind, IdentifierKind} from "./Link.js";
+
+export class InvalidUrlView extends TemplateView {
+    render(t, vm) {
+        return t.div({ className: "DisclaimerView card" }, [
+            t.h1("Invalid URL"),
+            t.p([
+                'The link you have entered is not valid. If you like, you can ',
+                t.a({ href: "#/" }, 'return to the home page.')
+            ]),
+            vm.validFixes.length ? this._renderValidFixes(t, vm.validFixes) : [],
+        ]);
+    }
+
+    _describeRoom(identifierKind) {
+        return identifierKind === IdentifierKind.RoomAlias ? "room alias" : "room";
+    }
+
+    _describeLinkKind(linkKind, identifierKind) {
+        switch (linkKind) {
+            case LinkKind.Room: return `The ${this._describeRoom(identifierKind)} `;
+            case LinkKind.User: return "The user ";
+            case LinkKind.Group: return "The group ";
+            case LinkKind.Event: return `An event in ${this._describeRoom(identifierKind)} `;
+        }
+    }
+
+    _renderValidFixes(t, validFixes) {
+        return t.p([
+            'Did you mean any of the following?',
+            t.ul(validFixes.map(fix =>
+                t.li([
+                    this._describeLinkKind(fix.link.kind, fix.link.identifierKind),
+                    t.a({ href: fix.url }, fix.link.identifier)
+                ])
+            ))
+        ]);
+    }
+}

src/InvalidUrlViewModel.js

@@ -14,19 +14,12 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-module.exports = {
+import {ViewModel} from "./utils/ViewModel.js";
-    stories: ['../src/**/*.stories.tsx'],
+import {tryFixUrl} from "./Link.js";
-    addons: [
-        '@storybook/preset-create-react-app',
-        '@storybook/addon-actions',
-        '@storybook/addon-links',
-        '@storybook/addon-storysource',
-        '@storybook/addon-viewport/register',
-        '@storybook/addon-a11y/register',
-        '@storybook/addon-knobs/register',
-        '@storybook/addon-actions/register',
-        'storybook-addon-designs',
-        '@storybook/addon-backgrounds/register',
-    ],
-};
 
+export class InvalidUrlViewModel extends ViewModel {
+    constructor(options) {
+        super(options);
+        this.validFixes = tryFixUrl(options.fragment);
+    }
+}

src/Link.js

@@ -0,0 +1,212 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {createEnum} from "./utils/enum.js";
+import {orderedUnique} from "./utils/unique.js";
+
+const ROOMALIAS_PATTERN = /^#([^:]*):(.+)$/;
+const ROOMID_PATTERN = /^!([^:]*):(.+)$/;
+const USERID_PATTERN = /^@([^:]+):(.+)$/;
+const EVENTID_PATTERN = /^$([^:]+):(.+)$/;
+const GROUPID_PATTERN = /^\+([^:]+):(.+)$/;
+
+export const IdentifierKind = createEnum(
+    "RoomId",
+    "RoomAlias",
+    "UserId",
+    "GroupId",
+);
+
+function asPrefix(identifierKind) {
+    switch (identifierKind) {
+        case IdentifierKind.RoomId: return "!";
+        case IdentifierKind.RoomAlias: return "#";
+        case IdentifierKind.GroupId: return "+";
+        case IdentifierKind.UserId: return "@";
+        default: throw new Error("invalid id kind " + identifierKind);
+    }
+}
+
+function getWebInstanceMap(queryParams) {
+    const prefix = "web-instance[";
+    const postfix = "]";
+    const webInstanceParams = queryParams.filter(([key]) => key.startsWith(prefix) && key.endsWith(postfix));
+    const webInstances = webInstanceParams.map(([key, value]) => {
+        const noPrefix = key.slice(prefix.length);
+        const clientId = noPrefix.slice(0, -postfix.length);
+        return [clientId, value];
+    });
+    return webInstances.reduce((map, [clientId, host]) => {
+        map[clientId] = host;
+        return map;
+    }, {});
+}
+
+export function getLabelForLinkKind(kind) {
+    switch (kind) {
+        case LinkKind.User: return "Start chat";
+        case LinkKind.Room: return "View room";
+        case LinkKind.Group: return "View community";
+        case LinkKind.Event: return "View message";
+    }
+}
+
+export const LinkKind = createEnum(
+    "Room",
+    "User",
+    "Group",
+    "Event"
+)
+
+export function tryFixUrl(fragment) {
+    const attempts = [];
+    const afterHash = fragment.substring(fragment.startsWith("#/") ? 2 : 1);
+    attempts.push('#/@' + afterHash);
+    attempts.push('#/#' + afterHash);
+    attempts.push('#/!' + afterHash);
+
+    const validAttempts = [];
+    for (const attempt of [...new Set(attempts)]) {
+        const link = Link.parseFragment(attempt);
+        if (link) {
+            validAttempts.push({ url: attempt, link });
+        }
+    }
+    return validAttempts;
+}
+
+export class Link {
+    static validateIdentifier(identifier) {
+        return !!(
+            USERID_PATTERN.exec(identifier) ||
+            ROOMALIAS_PATTERN.exec(identifier) || 
+            ROOMID_PATTERN.exec(identifier) ||
+            GROUPID_PATTERN.exec(identifier)
+        );
+    }
+
+    static parseIdentifier(identifier) {
+        return Link._parse(identifier);
+    }
+
+    static parseFragment(fragment) {
+        if (!fragment) {
+            return null;
+        }
+        let [linkStr, queryParamsStr] = fragment.split("?");
+        if (!linkStr.startsWith("#/")) {
+            return null;
+        }
+        linkStr = linkStr.slice(2);
+        const [identifier, eventId] = linkStr.split("/");
+
+        let viaServers = [];
+        let clientId = null;
+        let webInstances = {};
+        if (queryParamsStr) {
+            const queryParams = queryParamsStr.split("&").map(pair => {
+                const [key, value] = pair.split("=");
+                return [decodeURIComponent(key), decodeURIComponent(value)];
+            });
+            viaServers = queryParams
+                .filter(([key, value]) => key === "via")
+                .map(([,value]) => value);
+            const clientParam = queryParams.find(([key]) => key === "client");
+            if (clientParam) {
+                clientId = clientParam[1];
+            }
+            webInstances = getWebInstanceMap(queryParams);
+        }
+        return Link._parse(identifier, eventId, clientId, viaServers, webInstances);
+    }
+
+    static _parse(identifier, eventId = undefined, clientId = null, viaServers = [], webInstances = {}) {
+        if (!identifier) {
+            return null;
+        }
+        let matches;
+        matches = USERID_PATTERN.exec(identifier);
+        if (matches) {
+            const server = matches[2];
+            const localPart = matches[1];
+            return new Link(clientId, viaServers, IdentifierKind.UserId, localPart, server, webInstances);
+        }
+        matches = ROOMALIAS_PATTERN.exec(identifier);
+        if (matches) {
+            const server = matches[2];
+            const localPart = matches[1];
+            return new Link(clientId, viaServers, IdentifierKind.RoomAlias, localPart, server, webInstances, eventId);
+        }
+        matches = ROOMID_PATTERN.exec(identifier);
+        if (matches) {
+            const server = matches[2];
+            const localPart = matches[1];
+            return new Link(clientId, viaServers, IdentifierKind.RoomId, localPart, server, webInstances, eventId);
+        }
+        matches = GROUPID_PATTERN.exec(identifier);
+        if (matches) {
+            const server = matches[2];
+            const localPart = matches[1];
+            return new Link(clientId, viaServers, IdentifierKind.GroupId, localPart, server, webInstances);
+        }
+        return null;
+    }
+
+    constructor(clientId, viaServers, identifierKind, localPart, server, webInstances, eventId) {
+        const servers = [server];
+        servers.push(...viaServers);
+        this.webInstances = webInstances;
+        this.servers = orderedUnique(servers);
+        this.identifierKind = identifierKind;
+        this.identifier = `${asPrefix(identifierKind)}${localPart}:${server}`;
+        this.eventId = eventId;
+        this.clientId = clientId;
+    }
+
+    get kind() {
+        if (this.eventId) {
+            return LinkKind.Event;
+        }
+        switch (this.identifierKind) {
+            case IdentifierKind.RoomId:
+            case IdentifierKind.RoomAlias:
+                return LinkKind.Room;
+            case IdentifierKind.UserId:
+                return LinkKind.User;
+            case IdentifierKind.GroupId:
+                return LinkKind.Group;
+            default:
+                return null;
+        }
+    }
+
+    equals(link) {
+        return link &&
+            link.identifier === this.identifier &&
+            this.servers.length === link.servers.length &&
+            this.servers.every((s, i) => link.servers[i] === s) &&
+            Object.keys(this.webInstances).length === Object.keys(link.webInstances).length &&
+            Object.keys(this.webInstances).every(k => this.webInstances[k] === link.webInstances[k]);
+    }
+
+    toFragment() {
+        if (this.eventId) {
+            return `/${this.identifier}/${this.eventId}`;
+        } else {
+            return `/${this.identifier}`;
+        }
+    }
+}

src/Platform.js

@@ -0,0 +1,64 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {createEnum} from "./utils/enum.js";
+
+export const Platform = createEnum(
+    "DesktopWeb",
+    "MobileWeb",
+    "Android",
+    "iOS",
+    "Windows",
+    "macOS",
+    "Linux"
+);
+
+export function guessApplicablePlatforms(userAgent, platform) {
+    // return [Platform.DesktopWeb, Platform.Linux];
+    let nativePlatform;
+    let webPlatform;
+    if (/android/i.test(userAgent)) {
+        nativePlatform = Platform.Android;
+        webPlatform = Platform.MobileWeb;
+    } else if ( // https://stackoverflow.com/questions/9038625/detect-if-device-is-ios/9039885
+        (
+            /iPad|iPhone|iPod/.test(navigator.platform) ||
+            (navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1)
+        ) && !window.MSStream
+    ) {
+        nativePlatform = Platform.iOS;
+        webPlatform = Platform.MobileWeb;
+    } else if (platform.toLowerCase().indexOf("linux") !== -1) {
+        nativePlatform = Platform.Linux;
+        webPlatform = Platform.DesktopWeb;
+    } else if (platform.toLowerCase().indexOf("mac") !== -1) {
+        nativePlatform = Platform.macOS;
+        webPlatform = Platform.DesktopWeb;
+    } else {
+        nativePlatform = Platform.Windows;
+        webPlatform = Platform.DesktopWeb;
+    }
+    return [nativePlatform, webPlatform];
+}
+
+export function isWebPlatform(p) {
+    return p === Platform.DesktopWeb || p === Platform.MobileWeb;
+}
+
+
+export function isDesktopPlatform(p) {
+    return p === Platform.Linux || p === Platform.Windows || p === Platform.macOS;
+}

src/Preferences.js

@@ -0,0 +1,68 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {Platform} from "./Platform.js";
+import {EventEmitter} from "./utils/ViewModel.js";
+
+export class Preferences extends EventEmitter {
+    constructor(localStorage) {
+        super();
+        this._localStorage = localStorage;
+        this.clientId = null;
+        // used to differentiate web from native if a client supports both
+        this.platform = null;
+        this.homeservers = null;
+
+        const prefsStr = localStorage.getItem("preferred_client");
+        if (prefsStr) {
+            const {id, platform} = JSON.parse(prefsStr);
+            this.clientId = id;
+            this.platform = Platform[platform];
+        }
+        const serversStr = localStorage.getItem("consented_servers");
+        if (serversStr) {
+            this.homeservers = JSON.parse(serversStr);
+        }
+    }
+
+    setClient(id, platform) {
+        this.clientId = id;
+        platform = Platform[platform];
+        this.platform = platform;
+        this._localStorage.setItem("preferred_client", JSON.stringify({id, platform}));
+        this.emit("canClear")
+    }
+
+    setHomeservers(homeservers, persist) {
+        this.homeservers = homeservers;
+        if (persist) {
+            this._localStorage.setItem("consented_servers", JSON.stringify(homeservers));
+            this.emit("canClear");
+        }
+    }
+
+    clear() {
+        this._localStorage.removeItem("preferred_client");
+        this._localStorage.removeItem("consented_servers");
+        this.clientId = null;
+        this.platform = null;
+        this.homeservers = null;
+    }
+
+    get canClear() {
+        return !!this.clientId || !!this.platform || !!this.homeservers;
+    }
+}

src/RootView.js

@@ -0,0 +1,49 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {TemplateView} from "./utils/TemplateView.js";
+import {OpenLinkView} from "./open/OpenLinkView.js";
+import {CreateLinkView} from "./create/CreateLinkView.js";
+import {LoadServerPolicyView} from "./policy/LoadServerPolicyView.js";
+import {DisclaimerView} from "./disclaimer/DisclaimerView.js";
+import {InvalidUrlView} from "./InvalidUrlView.js";
+
+export class RootView extends TemplateView {
+    render(t, vm) {
+        return t.div({className: "RootView"}, [
+            t.mapView(vm => vm.invalidUrlViewModel, invalidVM => invalidVM ? new InvalidUrlView(invalidVM) : null),
+            t.mapView(vm => vm.showDisclaimer, disclaimer => disclaimer ? new DisclaimerView() : null),
+            t.mapView(vm => vm.openLinkViewModel, vm => vm ? new OpenLinkView(vm) : null),
+            t.mapView(vm => vm.createLinkViewModel, vm => vm ? new CreateLinkView(vm) : null),
+            t.mapView(vm => vm.loadServerPolicyViewModel, vm => vm ? new LoadServerPolicyView(vm) : null),
+            t.div({className: "footer"}, [
+                t.p(t.img({src: "images/matrix-logo.svg"})),
+                t.p(["This invite uses ", externalLink(t, "https://matrix.org", "Matrix"), ", an open network for secure, decentralized communication."]),
+                t.ul({className: "links"}, [
+                    t.li(externalLink(t, "https://github.com/matrix-org/matrix.to", "GitHub project")),
+                    t.li(externalLink(t, "https://github.com/matrix-org/matrix.to/tree/main/src/open/clients", "Add your app")),
+                    t.li({className: {hidden: vm => !vm.hasPreferences}},
+                        t.button({className: "text", onClick: () => vm.clearPreferences()}, "Clear preferences")),
+                    t.li(t.a({href: "#/disclaimer/"}, "Disclaimer")),
+                ])
+            ])
+        ]);
+    }
+}
+
+function externalLink(t, href, label) {
+    return t.a({href, target: "_blank", rel: "noopener noreferrer"}, label);
+}

src/RootViewModel.js

@@ -0,0 +1,98 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {Link} from "./Link.js";
+import {ViewModel} from "./utils/ViewModel.js";
+import {OpenLinkViewModel} from "./open/OpenLinkViewModel.js";
+import {createClients} from "./open/clients/index.js";
+import {CreateLinkViewModel} from "./create/CreateLinkViewModel.js";
+import {LoadServerPolicyViewModel} from "./policy/LoadServerPolicyViewModel.js";
+import {InvalidUrlViewModel} from "./InvalidUrlViewModel.js";
+import {Platform} from "./Platform.js";
+
+export class RootViewModel extends ViewModel {
+    constructor(options) {
+        super(options);
+        this.link = null;
+        this.openLinkViewModel = null;
+        this.createLinkViewModel = null;
+        this.loadServerPolicyViewModel = null;
+        this.invalidUrlViewModel = null;
+        this.showDisclaimer = false;
+        this.preferences.on("canClear", () => {
+            this.emitChange();
+        });
+    }
+
+    _updateChildVMs(newLink, oldLink) {
+        this.link = newLink;
+        if (!newLink) {
+            this.openLinkViewModel = null;
+        } else if (!oldLink || !oldLink.equals(newLink)) {
+            this.openLinkViewModel = new OpenLinkViewModel(this.childOptions({
+                link: newLink,
+                clients: createClients(),
+            }));
+        }
+    }
+
+    _hideLinks() {
+        this.link = null;
+        this.openLinkViewModel = null;
+        this.createLinkViewModel = null;
+    }
+
+    updateHash(hash) {
+        // All view models except openLink are re-created anyway. Might as well
+        // clear them to avoid having to manually reset (n-1)/n view models in every case.
+        // That just doesn't scale well when we add new views.
+        const oldLink = this.link;
+        this.invalidUrlViewModel = null;
+        this.showDisclaimer = false;
+        this.loadServerPolicyViewModel = null;
+        this.createLinkViewModel = null;
+        let newLink;
+        if (hash.startsWith("#/policy/")) {
+            const server = hash.slice(9);
+            this._updateChildVMs(null, oldLink);
+            this.loadServerPolicyViewModel = new LoadServerPolicyViewModel(this.childOptions({server}));
+            this.loadServerPolicyViewModel.load();
+        } else if (hash.startsWith("#/disclaimer/")) {
+            this._updateChildVMs(null, oldLink);
+            this.showDisclaimer = true;
+        }  else if (hash === "" || hash === "#" || hash === "#/") {
+            this._updateChildVMs(null, oldLink);
+            this.createLinkViewModel = new CreateLinkViewModel(this.childOptions());
+        } else if (newLink = Link.parseFragment(hash)) {
+            this._updateChildVMs(newLink, oldLink);
+        } else {
+            this._updateChildVMs(null, oldLink);
+            this.invalidUrlViewModel = new InvalidUrlViewModel(this.childOptions({
+                fragment: hash
+            }));
+        }
+        this.emitChange();
+    }
+
+    clearPreferences() {
+        this.preferences.clear();
+        this._updateChildVMs();
+    }
+
+    get hasPreferences() {
+        return this.preferences.canClear;
+    }
+}

src/create/CreateLinkView.js

@@ -0,0 +1,56 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {TemplateView} from "../utils/TemplateView.js";
+import {PreviewView} from "../preview/PreviewView.js";
+import {copyButton} from "../utils/copy.js";
+
+export class CreateLinkView extends TemplateView {
+    render(t, vm) {
+        const link = t.a({href: vm => vm.linkUrl}, vm => vm.linkUrl);
+        return t.div({className: "CreateLinkView card"}, [
+            t.h1("Create shareable links to Matrix rooms, users or messages without being tied to any app"),
+            t.form({action: "#", onSubmit: evt => this._onSubmit(evt)}, [
+                t.div(t.input({
+                    className: "fullwidth large",
+                    type: "text",
+                    name: "identifier",
+                    required: true,
+                    placeholder: "#room:example.com, @user:example.com",
+                    onChange: evt => this._onIdentifierChange(evt)
+                })),
+                t.div(t.input({className: "primary fullwidth icon link", type: "submit", value: "Create link"}))
+            ]),
+        ]);
+    }
+
+    _onSubmit(evt) {
+        evt.preventDefault();
+        const form = evt.target;
+        const {identifier} = form.elements;
+        this.value.createLink(identifier.value);
+        identifier.value = "";
+    }
+
+    _onIdentifierChange(evt) {
+        const inputField = evt.target;
+        if (!this.value.validateIdentifier(inputField.value)) {
+            inputField.setCustomValidity("That doesn't seem valid. Try #room:example.com, @user:example.com or +group:example.com.");
+        } else {
+            inputField.setCustomValidity("");
+        }
+    }
+}

src/create/CreateLinkViewModel.js

@@ -0,0 +1,38 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {ViewModel} from "../utils/ViewModel.js";
+import {PreviewViewModel} from "../preview/PreviewViewModel.js";
+import {Link} from "../Link.js";
+
+export class CreateLinkViewModel extends ViewModel {
+    constructor(options) {
+        super(options);
+        this._link = null;
+        this.previewViewModel = null;
+    }
+
+    validateIdentifier(identifier) {
+        return Link.validateIdentifier(identifier);
+    }
+
+    async createLink(identifier) {
+        this._link = Link.parseIdentifier(identifier);
+        if (this._link) {
+            this.openLink("#" + this._link.toFragment());
+        }
+    }
+}

src/disclaimer/DisclaimerView.js

@@ -0,0 +1,33 @@
+/*
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {TemplateView} from "../utils/TemplateView.js";
+
+export class DisclaimerView extends TemplateView {
+    render(t) {
+        return t.div({ className: "DisclaimerView card" }, [
+            t.h1("Disclaimer"),
+            t.p(
+                'Matrix.to is a service provided by the Matrix.org Foundation ' +
+                'which allows you to easily create invites to Matrix rooms and accounts, ' +
+                'regardless of your Matrix homeserver. The service is provided "as is" without ' +
+                'warranty of any kind, either express, implied, statutory or otherwise. ' +
+                'The Matrix.org Foundation shall not be responsible or liable for the room ' +
+                'and account contents shared via this service.'
+            ),
+        ]);
+    }
+}

src/main.js

@@ -0,0 +1,38 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {xhrRequest} from "./utils/xhr.js";
+import {RootViewModel} from "./RootViewModel.js";
+import {RootView} from "./RootView.js";
+import {Preferences} from "./Preferences.js";
+import {guessApplicablePlatforms} from "./Platform.js";
+
+export async function main(container) {
+    const vm = new RootViewModel({
+        request: xhrRequest,
+        openLink: url => location.href = url,
+        platforms: guessApplicablePlatforms(navigator.userAgent, navigator.platform),
+        preferences: new Preferences(window.localStorage),
+        origin: location.origin,
+    });
+    vm.updateHash(decodeURIComponent(location.hash));
+    window.__rootvm = vm;
+    const view = new RootView(vm);
+    container.appendChild(view.mount());
+    window.addEventListener('hashchange', () => {
+        vm.updateHash(decodeURIComponent(location.hash));
+    });
+}

src/open/ClientListView.js

@@ -0,0 +1,67 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {TemplateView} from "../utils/TemplateView.js";
+import {ClientView} from "./ClientView.js";
+
+export class ClientListView extends TemplateView {
+    render(t, vm) {
+        return t.mapView(vm => vm.clientViewModel, () => {
+            if (vm.clientViewModel) {
+                return new ContinueWithClientView(vm);
+            } else {
+                return new AllClientsView(vm);
+            }
+        });
+    }
+}
+
+class AllClientsView extends TemplateView {
+    render(t, vm) {
+        return t.div({className: "ClientListView"}, [
+            t.h2("Choose an app to continue"),
+            t.map(vm => vm.clientList, (clientList, t) => {
+                return t.div({className: "list"}, clientList.map(clientViewModel => {
+                    return t.view(new ClientView(clientViewModel));
+                }));
+            }),
+            t.div(t.label([
+                t.input({
+                    type: "checkbox",
+                    checked: vm.showUnsupportedPlatforms,
+                    onChange: evt => vm.showUnsupportedPlatforms = evt.target.checked,
+                }),
+                "Show apps not available on my platform"
+            ])),
+            t.div(t.label({className: "filterOption"}, [
+                t.input({
+                    type: "checkbox",
+                    checked: vm.showExperimental,
+                    onChange: evt => vm.showExperimental = evt.target.checked,
+                }),
+                "Show experimental apps"
+            ])),
+        ]);
+    }
+}
+
+class ContinueWithClientView extends TemplateView {
+    render(t, vm) {
+        return t.div({className: "ClientListView"}, [
+            t.div({className: "list"}, t.view(new ClientView(vm.clientViewModel)))
+        ]);
+    }
+}

src/open/ClientListViewModel.js

@@ -0,0 +1,89 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {isWebPlatform, Platform} from "../Platform.js";
+import {Maturity} from "./types.js";
+import {ClientViewModel} from "./ClientViewModel.js";
+import {ViewModel} from "../utils/ViewModel.js";
+
+export class ClientListViewModel extends ViewModel {
+    constructor(options) {
+        super(options);
+        const {clients, client, link} = options;
+        this._clients = clients;
+        this._link = link;
+        this.clientList = null;
+        this._showExperimental = false;
+        this._showUnsupportedPlatforms = false;
+        this._filterClients();
+        this.clientViewModel = null;
+        if (client) {
+            this._pickClient(client);
+        }
+    }
+
+    get showUnsupportedPlatforms() {
+        return this._showUnsupportedPlatforms;
+    }
+
+    get showExperimental() {
+        return this._showExperimental;
+    }
+
+    set showUnsupportedPlatforms(enabled) {
+        this._showUnsupportedPlatforms = enabled;
+        this._filterClients();
+    }
+
+    set showExperimental(enabled) {
+        this._showExperimental = enabled;
+        this._filterClients();
+    }
+
+    _filterClients() {
+        const clientVMs = this._clients.filter(client => {
+            const platformMaturities = this.platforms.map(p => client.getMaturity(p));
+            const isStable = platformMaturities.includes(Maturity.Stable) || platformMaturities.includes(Maturity.Beta);
+            const isSupported = client.platforms.some(p => this.platforms.includes(p));
+            if (!this._showExperimental && !isStable) {
+                return false;
+            }
+            if (!this._showUnsupportedPlatforms && !isSupported) {
+                return false;
+            }
+            return true;
+        }).map(client => new ClientViewModel(this.childOptions({
+            client,
+            link: this._link,
+            pickClient: client => this._pickClient(client)
+        })));
+        const preferredClientVMs = clientVMs.filter(c => c.hasPreferredWebInstance);
+        const otherClientVMs = clientVMs.filter(c => !c.hasPreferredWebInstance);
+        this.clientList = preferredClientVMs.concat(otherClientVMs);
+        this.emitChange();
+    }
+
+    _pickClient(client) {
+        this.clientViewModel = this.clientList.find(vm => vm.clientId === client.id);
+        this.clientViewModel.pick(this);
+        this.emitChange();
+    }
+
+    showAll() {
+        this.clientViewModel = null;
+        this.emitChange();
+    }
+}

src/open/ClientView.js

@@ -0,0 +1,142 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {TemplateView} from "../utils/TemplateView.js";
+import {copy} from "../utils/copy.js";
+import {text, tag} from "../utils/html.js";
+
+function formatPlatforms(platforms) {
+    return platforms.reduce((str, p, i, all) => {
+        const first = i === 0;
+        const last = i === all.length - 1;
+        return str + (first ? "" : last ? " & " : ", ") + p;
+    }, "");
+}
+
+function renderInstructions(parts) {
+    return parts.map(p => {
+        if (p.type === "code") {
+            return tag.code(p.text);
+        } else {
+            return text(p);
+        }
+    });
+}
+
+export class ClientView extends TemplateView {
+
+    render(t, vm) {
+        return t.div({className: {"ClientView": true, "isPreferred": vm => vm.hasPreferredWebInstance}}, [
+            ... vm.hasPreferredWebInstance ? [t.div({className: "hostedBanner"}, vm.hostedByBannerLabel)] : [],
+            t.div({className: "header"}, [
+                t.div({className: "description"}, [
+                    t.h3(vm.name),
+                    t.p([vm.description, " ", t.a({
+                        href: vm.homepage,
+                        target: "_blank",
+                        rel: "noopener noreferrer"
+                    }, "Learn more")]),
+                    t.p({className: "platforms"}, formatPlatforms(vm.availableOnPlatformNames)),
+                ]),
+                t.img({className: "clientIcon", src: vm.iconUrl})
+            ]),
+            t.mapView(vm => vm.stage, stage => {
+                switch (stage) {
+                    case "open": return new OpenClientView(vm);
+                    case "install": return new InstallClientView(vm);
+                }
+            }),
+        ]);
+    }
+}
+
+class OpenClientView extends TemplateView {
+    render(t, vm) {
+        return t.div({className: "OpenClientView"}, [
+            ...vm.openActions.map(a => renderAction(t, a)),
+            showBack(t, vm),
+        ]);
+    }
+}
+
+class InstallClientView extends TemplateView {
+    render(t, vm) {
+        const children = [];
+
+        const textInstructions = vm.textInstructions;
+        if (textInstructions) {
+            const copyButton = t.button({
+                className: "copy",
+                title: "Copy instructions",
+                "aria-label": "Copy instructions",
+                onClick: evt => {
+                    if (copy(vm.copyString, copyButton.parentElement)) {
+                        copyButton.className = "tick";
+                        setTimeout(() => {
+                            copyButton.className = "copy";
+                        }, 2000);
+                    }
+                }
+            });
+            children.push(t.p({className: "instructions"}, renderInstructions(textInstructions).concat(copyButton)));
+        }
+
+        const actions = t.div({className: "actions"}, vm.installActions.map(a => renderAction(t, a)));
+        children.push(actions);
+
+        if (vm.showDeepLinkInInstall) {
+            const openItHere = t.a({
+                rel: "noopener noreferrer",
+                href: vm.openActions[0].url,
+                onClick: () => vm.openActions[0].activated(),
+            }, "open it here");
+            children.push(t.p([`If you already have ${vm.name} installed, you can `, openItHere, "."]))
+        }
+
+        children.push(showBack(t, vm));
+
+        return t.div({className: "InstallClientView"}, children);
+    }
+}
+
+function showBack(t, vm) {
+    return t.p({className: {caption: true, "back": true, hidden: vm => !vm.showBack}}, [
+        `Continue with ${vm.name} · `,
+        t.button({className: "text", onClick: () => vm.back()}, "Change"),
+    ]);
+}
+
+function renderAction(t, a) {
+    let badgeUrl;
+    switch (a.kind) {
+        case "play-store": badgeUrl = "images/google-play-us.svg"; break;
+        case "fdroid": badgeUrl = "images/fdroid-badge.png"; break;
+        case "apple-app-store": badgeUrl = "images/app-store-us-alt.svg"; break;
+        case "flathub": badgeUrl = "images/flathub-badge.svg"; break;
+    }
+    return t.a({
+        href: a.url,
+        className: {
+            fullwidth: !badgeUrl,
+            primary: a.primary && !badgeUrl,
+            secondary: !a.primary && !badgeUrl,
+            badge: !!badgeUrl,
+        },
+        rel: "noopener noreferrer",
+        ["aria-label"]: a.label, 
+        onClick: () => a.activated()
+    }, badgeUrl ? t.img({src: badgeUrl}) : a.label);
+}

src/open/ClientViewModel.js

@@ -0,0 +1,239 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {isWebPlatform, isDesktopPlatform, Platform} from "../Platform.js";
+import {ViewModel} from "../utils/ViewModel.js";
+import {IdentifierKind} from "../Link.js";
+
+function getMatchingPlatforms(client, supportedPlatforms) {
+    const clientPlatforms = client.platforms;
+    const matchingPlatforms = supportedPlatforms.filter(p => {
+        return clientPlatforms.includes(p);
+    });
+    return matchingPlatforms;
+}
+
+export class ClientViewModel extends ViewModel {
+    constructor(options) {
+        super(options);
+        const {client, link, pickClient} = options;
+        this._client = client;
+        this._link = link;
+        this._pickClient = pickClient;
+        // to provide "choose other client" button after calling pick()
+        this._clientListViewModel = null;
+        this._update();
+    }
+
+    _update() {
+        const matchingPlatforms = getMatchingPlatforms(this._client, this.platforms);
+        this._webPlatform = matchingPlatforms.find(p => isWebPlatform(p));
+        this._nativePlatform = matchingPlatforms.find(p => !isWebPlatform(p));
+        const preferredPlatform = matchingPlatforms.find(p => p === this.preferences.platform);
+        this._proposedPlatform = preferredPlatform || this._nativePlatform || this._webPlatform;
+
+        this.openActions = this._createOpenActions();
+        this.installActions = this._createInstallActions();
+        this._clientCanIntercept = !!(this._nativePlatform && this._client.canInterceptMatrixToLinks(this._nativePlatform));
+        this._showOpen = this.openActions.length && !this._clientCanIntercept;
+    }
+
+    // these are only shown in the open stage
+    _createOpenActions() {
+        const hasPreferredWebInstance = this.hasPreferredWebInstance;
+        let deepLinkLabel = "Continue";
+        if (hasPreferredWebInstance) {
+            if (this._proposedPlatform === this._nativePlatform) {
+                deepLinkLabel = "Open in app";
+            } else {
+                deepLinkLabel = `Open on ${this._client.getPreferredWebInstance(this._link)}`;
+            }
+        }
+        const actions = [];
+        const proposedDeepLink = this._client.getDeepLink(this._proposedPlatform, this._link);
+        if (proposedDeepLink) {
+            actions.push({
+                label: deepLinkLabel,
+                url: proposedDeepLink,
+                primary: true,
+                activated: () => {
+                    this._pickClient(this._client);
+                    this.preferences.setClient(this._client.id, this._proposedPlatform);
+                    // only show install screen if we tried to open a native deeplink
+                    if (this._showOpen && this._proposedPlatform === this._nativePlatform) {
+                        this._showOpen = false;
+                        this.emitChange();
+                    }
+                },
+            });
+        }
+        // show only if there is a preferred instance, and if we don't already link to it in the first button
+        if (hasPreferredWebInstance && this._webPlatform && this._proposedPlatform !== this._webPlatform) {
+            actions.push({
+                label: `Open on ${this._client.getPreferredWebInstance(this._link)}`,
+                url: this._client.getDeepLink(this._webPlatform, this._link),
+                kind: "open-in-web",
+                activated: () => {} // don't persist this choice as we don't persist the preferred web instance, it's in the url
+            });
+        }
+        return actions;
+    }
+
+    // these are only shown in the install stage
+    _createInstallActions() {
+        let actions = [];
+        if (this._nativePlatform) {
+            const nativeActions = (this._client.getInstallLinks(this._nativePlatform) || []).map(installLink => {
+                return {
+                    label: installLink.getDescription(this._nativePlatform),
+                    url: installLink.createInstallURL(this._link),
+                    kind: installLink.channelId,
+                    primary: true,
+                    activated: () => this.preferences.setClient(this._client.id, this._nativePlatform),
+                };
+            });
+            actions.push(...nativeActions);
+        }
+        if (this._webPlatform) {
+            const webDeepLink = this._client.getDeepLink(this._webPlatform, this._link);
+            if (webDeepLink) {
+                const webLabel = this.hasPreferredWebInstance ?
+                    `Open on ${this._client.getPreferredWebInstance(this._link)}` :
+                    `Continue in your browser`;
+                actions.push({
+                    label: webLabel,
+                    url: webDeepLink,
+                    kind: "open-in-web",
+                    activated: () => {
+                        if (!this.hasPreferredWebInstance) {
+                            this.preferences.setClient(this._client.id, this._webPlatform);
+                        }
+                    },
+                });
+            }
+        }
+        return actions;
+    }
+
+    get hasPreferredWebInstance() {
+        // also check there is a web platform that matches the platforms the user is on (mobile or desktop web)
+        return this._webPlatform && typeof this._client.getPreferredWebInstance(this._link) === "string";
+    }
+
+    get hostedByBannerLabel() {
+        const preferredWebInstance = this._client.getPreferredWebInstance(this._link);
+        if (this._webPlatform && preferredWebInstance) {
+            let label = preferredWebInstance;
+            const subDomainIdx = preferredWebInstance.lastIndexOf(".", preferredWebInstance.lastIndexOf("."));
+            if (subDomainIdx !== -1) {
+                label = preferredWebInstance.slice(preferredWebInstance.length - subDomainIdx + 1);
+            }
+            return `Hosted by ${label}`;
+        }
+        return;
+    }
+
+    get homepage() {
+        return this._client.homepage;
+    }
+
+    get identifier() {
+        return this._link.identifier;
+    }
+
+    get description() {
+        return this._client.description;
+    }
+
+    get clientId() {
+        return this._client.id;
+    }
+
+    get name() {
+        return this._client.name;
+    }
+
+    get iconUrl() {
+        return this._client.icon;
+    }
+
+    get stage() {
+        return this._showOpen ? "open" : "install";
+    }
+
+    get textInstructions() {
+        let instructions = this._client.getLinkInstructions(this._proposedPlatform, this._link);
+        if (instructions && !Array.isArray(instructions)) {
+            instructions = [instructions];
+        }
+        return instructions;
+    }
+
+    get copyString() {
+        return this._client.getCopyString(this._proposedPlatform, this._link);
+    }
+
+    get showDeepLinkInInstall() {
+        // we can assume this._nativePlatform as this._clientCanIntercept already checks it
+        return this._clientCanIntercept && !!this._client.getDeepLink(this._nativePlatform, this._link);
+    }
+
+    get availableOnPlatformNames() {
+        const platforms = this._client.platforms;
+        const textPlatforms = [];
+        const hasWebPlatform = platforms.some(p => isWebPlatform(p));
+        if (hasWebPlatform) {
+            textPlatforms.push("Web");
+        }
+        const desktopPlatforms = platforms.filter(p => isDesktopPlatform(p));
+        if (desktopPlatforms.length === 1) {
+            textPlatforms.push(desktopPlatforms[0]);
+        } else {
+            textPlatforms.push("Desktop");
+        }
+        if (platforms.includes(Platform.Android)) {
+            textPlatforms.push("Android");
+        }
+        if (platforms.includes(Platform.iOS)) {
+            textPlatforms.push("iOS");
+        }
+        return textPlatforms;
+    }
+
+    pick(clientListViewModel) {
+        this._clientListViewModel = clientListViewModel;
+        this.emitChange();
+    }
+
+    // whether or not we are only showing this client (in open or install stage)
+    get showBack() {
+        return !!this._clientListViewModel;
+    }
+
+    back() {
+        if (this._clientListViewModel) {
+            const vm = this._clientListViewModel;
+            this._clientListViewModel = null;
+            // clear the client preference so we default back to to native link if any
+            // in the list with all clients, and also if we refresh, we get the list with
+            // all clients rather than having our "change client" click reverted.
+            this.preferences.setClient(undefined, undefined);
+            this._update();
+            this.emitChange();
+            vm.showAll();
+        }
+    }
+}

src/open/OpenLinkView.js

@@ -0,0 +1,45 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {TemplateView} from "../utils/TemplateView.js";
+import {ClientListView} from "./ClientListView.js";
+import {PreviewView} from "../preview/PreviewView.js";
+import {ServerConsentView} from "./ServerConsentView.js";
+
+export class OpenLinkView extends TemplateView {
+    render(t, vm) {
+        return t.div({className: "OpenLinkView card"}, [
+            t.mapView(vm => vm.previewViewModel, previewVM => previewVM ?
+                new ShowLinkView(vm) :
+                new ServerConsentView(vm.serverConsentViewModel)
+            ),
+        ]);
+    }
+}
+
+class ShowLinkView extends TemplateView {
+    render(t, vm) {
+        return t.div([
+            t.view(new PreviewView(vm.previewViewModel)),
+            t.view(new ClientListView(vm.clientsViewModel)),
+            t.p({className: {caption: true, hidden: vm => !vm.previewDomain}}, [
+                vm => vm.previewFailed ? `${vm.previewDomain} has not returned a preview.` : `Preview provided by ${vm.previewDomain}`,
+                " · ",
+                t.button({className: "text", onClick: () => vm.changeServer()}, "Change"),
+            ]),
+        ]);
+    }
+}

src/open/OpenLinkViewModel.js

@@ -0,0 +1,95 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {ViewModel} from "../utils/ViewModel.js";
+import {ClientListViewModel} from "./ClientListViewModel.js";
+import {ClientViewModel} from "./ClientViewModel.js";
+import {PreviewViewModel} from "../preview/PreviewViewModel.js";
+import {ServerConsentViewModel} from "./ServerConsentViewModel.js";
+import {getLabelForLinkKind} from "../Link.js";
+import {orderedUnique} from "../utils/unique.js";
+
+export class OpenLinkViewModel extends ViewModel {
+    constructor(options) {
+        super(options);
+        const {clients, link} = options;
+        this._link = link;
+        this._clients = clients;
+        this.serverConsentViewModel = null;
+        this.previewViewModel = null;
+        this.clientsViewModel = null;
+        this.previewLoading = false;
+        if (this.preferences.homeservers === null) {
+            this._showServerConsent();
+        } else {
+            this._showLink();
+        }
+    }
+
+    _showServerConsent() {
+        let servers = [];
+        if (this.preferences.homeservers) {
+            servers.push(...this.preferences.homeservers);
+        }
+        servers.push(...this._link.servers);
+        servers = orderedUnique(servers);
+        this.serverConsentViewModel = new ServerConsentViewModel(this.childOptions({
+            servers,
+            done: () => {
+                this.serverConsentViewModel = null;
+                this._showLink();
+            }
+        }));
+    }
+
+    async _showLink() {
+        const clientId = this.preferences.clientId || this._link.clientId;
+        const preferredClient = clientId ? this._clients.find(c => c.id === clientId) : null;
+        this.clientsViewModel = new ClientListViewModel(this.childOptions({
+            clients: this._clients,
+            link: this._link,
+            client: preferredClient,
+        }));
+        this.previewViewModel = new PreviewViewModel(this.childOptions({
+            link: this._link,
+            consentedServers: this.preferences.homeservers
+        }));
+        this.previewLoading = true;
+        this.emitChange();
+        await this.previewViewModel.load();
+        this.previewLoading = false;
+        this.emitChange();
+    }
+
+    get previewDomain() {
+        return this.previewViewModel?.domain;
+    }
+
+    get previewFailed() {
+        return this.previewViewModel?.failed;
+    }
+
+    get showClientsLabel() {
+        return getLabelForLinkKind(this._link.kind);
+    }
+
+    changeServer() {
+        this.previewViewModel = null;
+        this.clientsViewModel = null;
+        this._showServerConsent();
+        this.emitChange();
+    }
+}

src/open/ServerConsentView.js

@@ -0,0 +1,134 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {TemplateView} from "../utils/TemplateView.js";
+import {ClientListView} from "./ClientListView.js";
+import {PreviewView} from "../preview/PreviewView.js";
+
+export class ServerConsentView extends TemplateView {
+    render(t, vm) {
+        const useAnotherServer = t.button({
+            className: "text",
+            onClick: () => vm.setShowServers()}, "use another server");
+        const continueWithoutPreview = t.button({
+            className: "text",
+            onClick: () => vm.continueWithoutConsent(this._askEveryTimeChecked)
+        }, "continue without a preview");
+        return t.div({className: "ServerConsentView"}, [
+            t.p([
+                "Preview this link using the ",
+                t.strong(vm => vm.selectedServer || "…"),
+                " homeserver ",
+                t.span({className: {hidden: vm => !vm.selectedServer}}, [
+                    " (",
+                    t.a({
+                        href: vm => `#/policy/${vm.selectedServer}`,
+                        target: "_blank",
+                    }, "privacy policy"),
+                    ")",
+                ]),
+                t.span({className: {hidden: vm => vm.showSelectServer}}, [
+                    ", ",
+                    useAnotherServer,
+                ]),
+                " or ",
+                continueWithoutPreview,
+                "."
+            ]),
+            t.form({action: "#", id: "serverConsentForm", onSubmit: evt => this._onSubmit(evt)}, [
+                t.mapView(vm => vm.showSelectServer, show => show ? new ServerOptions(vm) : null),
+                t.div({className: "actions"}, [
+                    t.label([t.input({type: "checkbox", name: "askEveryTime"}), "Ask every time"]),
+                    t.input({type: "submit", value: "Continue", className: "primary fullwidth"})
+                ])
+            ])
+        ]);
+    }
+
+    _onSubmit(evt) {
+        evt.preventDefault();
+        this.value.continueWithSelection(this._askEveryTimeChecked);
+    }
+
+    get _askEveryTimeChecked() {
+        const form = document.getElementById("serverConsentForm");
+        const {askEveryTime} = form.elements;
+        return askEveryTime.checked;
+    }
+}
+
+class ServerOptions extends TemplateView {
+    render(t, vm) {
+        const options = vm.servers.map(server => {
+            return t.div(t.label([t.input({
+                type: "radio",
+                name: "selectedServer",
+                value: server,
+                checked: server === vm.selectedServer
+            }), t.span(server)]))
+        });
+        options.push(t.div({className: "other"}, t.label([
+            t.input({type: "radio", name: "selectedServer", value: "other"}),
+            t.input({
+                type: "text",
+                className: "line",
+                placeholder: "Other",
+                name: "otherServer",
+                onClick: evt => this._onClickOther(evt),
+            })
+        ])));
+        return t.div({
+            className: "ServerOptions",
+            onChange: evt => this._onChange(evt),
+        }, options);
+    }
+
+    _onClickOther(evt) {
+        const textField = evt.target;
+        const radio = Array.from(textField.form.elements.selectedServer).find(r => r.value === "other");
+        if (!radio.checked) {
+            radio.checked = true;
+            this._onChangeServerRadio(radio);
+        }
+    }
+
+    _onChange(evt) {
+        let {name, value} = evt.target;
+        if (name === "selectedServer") {
+            this._onChangeServerRadio(evt.target);
+        } else if (name === "otherServer") {
+            const textField = evt.target;
+            if(!this.value.selectOtherServer(value)) {
+                textField.setCustomValidity("Please enter a valid domain name");
+            } else {
+                textField.setCustomValidity("");
+            }
+        }
+    }
+
+    _onChangeServerRadio(radio) {
+        let {value, form} = radio;
+        const {otherServer} = form.elements;
+        if (value === "other") {
+            otherServer.required = true;
+            value = otherServer.value;
+        } else {
+            otherServer.required = false;
+            otherServer.setCustomValidity("");
+        }
+        this.value.selectServer(value);
+    }
+}

src/open/ServerConsentViewModel.js

@@ -0,0 +1,71 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {ViewModel} from "../utils/ViewModel.js";
+import {ClientListViewModel} from "./ClientListViewModel.js";
+import {ClientViewModel} from "./ClientViewModel.js";
+import {PreviewViewModel} from "../preview/PreviewViewModel.js";
+import {getLabelForLinkKind} from "../Link.js";
+import {orderedUnique} from "../utils/unique.js";
+
+export class ServerConsentViewModel extends ViewModel {
+    constructor(options) {
+        super(options);
+        this.servers = options.servers;
+        this.done = options.done;
+        this.selectedServer = this.servers[0];
+        this.showSelectServer = false;
+    }
+
+    setShowServers() {
+        this.showSelectServer = true;
+        this.emitChange();
+    }
+
+    selectServer(server) {
+        this.selectedServer = server;
+        this.emitChange();
+    }
+
+    selectOtherServer(domainOrUrl) {
+        let urlStr = domainOrUrl;
+        if (!urlStr.startsWith("http://") && !urlStr.startsWith("https://")) {
+            urlStr = `https://${domainOrUrl}`;
+        }
+        try {
+            const domain = new URL(urlStr).hostname;
+            if (/((?:[0-9a-zA-Z][0-9a-zA-Z-]{1,61}\.)+)(xn--[a-z0-9]+|[a-z]+)/.test(domain) || domain === "localhost") {
+                this.selectServer(domainOrUrl);
+                return true;
+            }
+        } catch (err) {}
+        this.selectServer(null);
+        return false;
+    }
+
+    continueWithSelection(askEveryTime) {
+        // keep previously consented servers
+        const homeservers = this.preferences.homeservers || [];
+        homeservers.unshift(this.selectedServer);
+        this.preferences.setHomeservers(orderedUnique(homeservers), !askEveryTime);
+        this.done();
+    }
+
+    continueWithoutConsent(askEveryTime) {
+        this.preferences.setHomeservers([], !askEveryTime);
+        this.done();
+    }
+}

src/open/clients/Cinny.js

@@ -0,0 +1,84 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+Copyright 2022 3nt3 <gott@3nt3.de>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { Maturity, Platform, LinkKind, FlathubLink, style } from "../types.js";
+
+export class Cinny {
+    get id() {
+        return "cinny";
+    }
+    get name() {
+        return "Cinny";
+    }
+    get icon() {
+        return "images/client-icons/cinny.svg";
+    }
+    get author() {
+        return "Copyright (c) 2021-present Ajay Bura (ajbura) and contributors";
+    }
+    get homepage() {
+        return "https://cinny.in";
+    }
+    get platforms() {
+        return [
+            Platform.DesktopWeb,
+            Platform.Linux,
+            Platform.macOS,
+            Platform.Windows,
+        ];
+    }
+    get description() {
+        return "A Matrix client focusing primarily on simple, elegant and secure interface. The main goal is to have an instant messaging application that is easy on people and has a modern touch.";
+    }
+    getMaturity(platform) {
+        return Maturity.Stable;
+    }
+
+    getDeepLink(platform, link) {
+        let fragmentPath;
+
+        switch (link.kind) {
+            case LinkKind.User:
+                fragmentPath = `direct/create?userId=${encodeURIComponent(link.identifier)}`;
+                break;
+            case LinkKind.Room:
+                fragmentPath = `home/${encodeURIComponent(link.identifier)}`;
+                break;
+            case LinkKind.Event:
+                fragmentPath = `home/${encodeURIComponent(link.identifier)}/${encodeURIComponent(link.eventId)}`;
+                break;
+        }
+
+         if ((link.kind === LinkKind.Event || link.kind === LinkKind.Room) && link.servers.length > 0) {
+            fragmentPath += `?via=${link.servers.map(server => encodeURIComponent(server)).join(',')}`;
+        }
+
+        return `https://app.cinny.in/${fragmentPath}`
+    }
+
+    canInterceptMatrixToLinks(platform) {
+        return false;
+    }
+
+    getLinkInstructions(platform, link) {}
+
+    getCopyString(platform, link) {}
+
+    getInstallLinks(platform) {}
+
+    getPreferredWebInstance(link) {}
+}

src/open/clients/Element.js

@@ -0,0 +1,114 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {Maturity, Platform, LinkKind,
+    FDroidLink, AppleStoreLink, PlayStoreLink, WebsiteLink} from "../types.js";
+
+const trustedWebInstances = [
+    "app.element.io",   // first one is the default one
+    "develop.element.io",
+    "chat.fedoraproject.org",
+    "chat.fosdem.org",
+    "chat.mozilla.org",
+    "webchat.kde.org",
+    "app.gitter.im",
+];
+
+/**
+ * Information on how to deep link to a given matrix client.
+ */
+export class Element {
+    get id() { return "element.io"; }
+
+    get platforms() {
+        return [
+            Platform.Android, Platform.iOS,
+            Platform.Windows, Platform.macOS, Platform.Linux,
+            Platform.DesktopWeb
+        ];
+    }
+
+    get icon() { return "images/client-icons/element.svg"; }
+    get appleAssociatedAppId() { 
+        return [
+            "7J4U792NQT.im.vector.app",
+            "7J4U792NQT.io.element.elementx",
+            "7J4U792NQT.io.element.elementx.nightly",
+            "7J4U792NQT.io.element.elementx.pr"
+        ]; 
+    }
+    get name() {return "Element"; }
+    get description() { return 'Fully-featured Matrix client, used by millions.'; }
+    get homepage() { return "https://element.io"; }
+    get author() { return "Element"; }
+    getMaturity(platform) { return Maturity.Stable; }
+
+    getDeepLink(platform, link) {
+        let fragmentPath;
+        switch (link.kind) {
+            case LinkKind.User:
+                fragmentPath = `user/${encodeURIComponent(link.identifier)}`;
+                break;
+            case LinkKind.Room:
+                fragmentPath = `room/${encodeURIComponent(link.identifier)}`;
+                break;
+            case LinkKind.Group:
+                fragmentPath = `group/${encodeURIComponent(link.identifier)}`;
+                break;
+            case LinkKind.Event:
+                fragmentPath = `room/${encodeURIComponent(link.identifier)}/${encodeURIComponent(link.eventId)}`;
+                break;
+        }
+
+        if ((link.kind === LinkKind.Event || link.kind === LinkKind.Room) && link.servers.length > 0) {
+            fragmentPath += '?' + link.servers.map(server => `via=${encodeURIComponent(server)}`).join('&');
+        }
+
+        const isWebPlatform = platform === Platform.DesktopWeb || platform === Platform.MobileWeb;
+        if (isWebPlatform || platform === Platform.iOS) {
+            let instanceHost = trustedWebInstances[0];
+            // we use app.element.io which iOS will intercept, but it likely won't intercept any other trusted instances
+            // so only use a preferred web instance for true web links.
+            if (isWebPlatform && trustedWebInstances.includes(link.webInstances[this.id])) {
+                instanceHost = link.webInstances[this.id];
+            }
+            return `https://${instanceHost}/#/${fragmentPath}`;
+        } else if (platform === Platform.Linux || platform === Platform.Windows || platform === Platform.macOS) {
+            return `element://vector/webapp/#/${fragmentPath}`;
+        } else {
+            return `element://${fragmentPath}`;
+        }
+    }
+
+    getLinkInstructions(platform, link) {}
+    getCopyString(platform, link) {}
+    getInstallLinks(platform) {
+        switch (platform) {
+            case Platform.iOS: return [new AppleStoreLink('vector', 'id1083446067')];
+            case Platform.Android: return [new PlayStoreLink('im.vector.app'), new FDroidLink('im.vector.app')];
+            default: return [new WebsiteLink("https://element.io/download")];
+        }
+    }
+
+    canInterceptMatrixToLinks(platform) {
+        return platform === Platform.Android;
+    }
+
+    getPreferredWebInstance(link) {
+        const idx = trustedWebInstances.indexOf(link.webInstances[this.id])
+        return idx === -1 ? undefined : trustedWebInstances[idx];
+    }
+}

src/open/clients/Fluffychat.js

@@ -0,0 +1,94 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { Maturity, Platform, LinkKind, FlathubLink, AppleStoreLink, PlayStoreLink, FDroidLink, WebsiteLink } from "../types.js";
+
+/**
+ * Information on how to deep link to a given matrix client.
+ */
+export class Fluffychat {
+    get id() { return "im.fluffychat"; }
+    get name() { return "FluffyChat"; }
+    get icon() { return "images/client-icons/fluffychat.svg"; }
+    get author() { return "Krille Fear"; }
+    get homepage() { return "https://fluffychat.im"; }
+    get platforms() {
+        return [
+            Platform.Android, Platform.iOS,
+            Platform.Windows, Platform.macOS, Platform.Linux,
+            Platform.DesktopWeb,
+        ];
+    }
+    get description() { return "Chat with your friends using the cutest messenger in the Matrix network"; }
+    getMaturity(platform) {
+        switch (platform) {
+            case Platform.Android: return Maturity.Stable;
+            case Platform.iOS: return Maturity.Stable;
+            case Platform.DesktopWeb: return Maturity.Stable;
+            case Platform.Linux: return Maturity.Stable;
+            case Platform.macOS: return Maturity.Beta;
+            case Platform.Windows: return Maturity.Beta;
+        }
+    }
+
+    getInstallLinks(platform) {
+        switch (platform) {
+            case Platform.iOS: return [new AppleStoreLink("fluffychat", "id1551469600")];
+            case Platform.Android: return [
+                new PlayStoreLink("chat.fluffy.fluffychat"),
+                new FDroidLink('chat.fluffy.fluffychat'),
+            ];
+            case Platform.Linux: return [
+                new FlathubLink("im.fluffychat.Fluffychat"),
+                new WebsiteLink("https://fluffychat.im"),
+            ];
+            default: return [new WebsiteLink("https://fluffychat.im")];
+        }
+    }
+
+    getLinkInstructions(platform, link) {
+        if (link.kind === LinkKind.User) {
+            switch (platform) {
+                case Platform.Android: return;
+                case Platform.DesktopWeb: return "Open the web app at https://fluffychat.im/web/ and log in to your account. Click on '+' and paste the username.";
+                default: return "Open the app and click on '+' and paste the username.";
+            }
+        }
+        if (link.kind === LinkKind.Room) {
+            switch (platform) {
+                case Platform.Android: return;
+                case Platform.DesktopWeb: return "Open the web app at https://fluffychat.im/web/ and log in to your account. Click on 'Discover' and paste the identifier.";
+                default: return "Open the app on your device. Click on 'Discover' and paste the identifier.";
+            }
+        }
+    }
+
+    getCopyString(platform, link) {
+        if (link.kind === LinkKind.User || link.kind === LinkKind.Room) {
+            return link.identifier;
+        }
+    }
+
+    getDeepLink(platform, link) {
+        switch (platform) {
+            case Platform.Android: return `im.fluffychat://chat/${link.identifier}`;
+            case Platform.iOS: return `im.fluffychat://chat/${link.identifier}`;
+            default: break;
+        }
+    }
+    canInterceptMatrixToLinks(platform) {
+        return platform === Platform.Android;
+    }
+
+    getPreferredWebInstance(link) {}
+}

src/open/clients/Fractal.js

@@ -0,0 +1,81 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {Maturity, Platform, LinkKind, FlathubLink} from "../types.js";
+
+/**
+ * Information on how to deep link to a given matrix client.
+ */
+export class Fractal {
+    get id() { return "fractal"; }
+    get name() { return "Fractal"; }
+    get icon() { return "images/client-icons/fractal.svg"; }
+    get author() { return "Daniel Garcia Moreno"; }
+    get homepage() { return "https://gitlab.gnome.org/World/fractal"; }
+    get platforms() { return [Platform.Linux]; }
+    get description() { return 'GNOME client, suitable for desktop and mobile. Written in Rust.'; }
+    getMaturity(platform) { return Maturity.Beta; }
+
+    getDeepLink(platform, link) {
+        if (platform === Platform.Linux) {
+            let identifier = encodeURIComponent(link.identifier.substring(1));
+            let isRoomid = link.identifier.substring(0, 1) === '!';
+            let fragmentPath;
+            switch (link.kind) {
+                case LinkKind.User:
+                    fragmentPath = `u/${identifier}?action=chat`;
+                    break;
+                case LinkKind.Room:
+                case LinkKind.Event:
+                    if (isRoomid)
+                        fragmentPath = `roomid/${identifier}`;
+                    else
+                        fragmentPath = `r/${identifier}`;
+
+                    if (link.kind === LinkKind.Event)
+                        fragmentPath += `/e/${encodeURIComponent(link.eventId.substring(1))}`;
+                    fragmentPath += '?action=join';
+                    fragmentPath += link.servers.map(server => `&via=${encodeURIComponent(server)}`).join('');
+                    break;
+                case LinkKind.Group:
+                    return;
+            }
+            return `matrix:${fragmentPath}`;
+        }
+    }
+
+    canInterceptMatrixToLinks(platform) { return false; }
+
+    getLinkInstructions(platform, link) {
+        if (link.kind === LinkKind.User || link.kind === LinkKind.Room) {
+            return "Click the menu button above the list of rooms, select the Join Room entry, and paste the identifier";
+        }
+    }
+
+    getCopyString(platform, link) {
+        if (link.kind === LinkKind.User || link.kind === LinkKind.Room) {
+            return link.identifier;
+        }
+    }
+
+    getInstallLinks(platform) {
+        if (platform === Platform.Linux) {
+            return [new FlathubLink("org.gnome.Fractal")];
+        }
+    }
+
+    getPreferredWebInstance(link) {}
+}

src/open/clients/NeoChat.js

@@ -0,0 +1,79 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+Copyright 2021 Carl Schwan <carl@carlschwan.eu>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {Maturity, Platform, LinkKind, FlathubLink, style} from "../types.js";
+
+export class NeoChat {
+    get id() { return "neochat"; }
+    get name() { return "NeoChat"; }
+    get icon() { return "images/client-icons/org.kde.neochat.svg"; }
+    get author() { return "Tobias Fella and Carl Schwan"; }
+    get homepage() { return "https://apps.kde.org/neochat/"; }
+    get platforms() { return [Platform.Linux]; }
+    get description() { return 'NeoChat is a convergent, cross-platform Matrix client.'; }
+    getMaturity(platform) { return Maturity.Beta; }
+    getDeepLink(platform, link) {
+        if (platform === Platform.Linux || platform === Platform.Windows) {
+            let identifier = encodeURIComponent(link.identifier.substring(1));
+            let isRoomid = link.identifier.substring(0, 1) === '!';
+            let fragmentPath;
+            switch (link.kind) {
+                case LinkKind.User:
+                    fragmentPath = `u/${identifier}?action=chat`;
+                    break;
+                case LinkKind.Room:
+                case LinkKind.Event:
+                    if (isRoomid)
+                        fragmentPath = `roomid/${identifier}`;
+                    else
+                        fragmentPath = `r/${identifier}`;
+
+                    if (link.kind === LinkKind.Event)
+                        fragmentPath += `/e/${encodeURIComponent(link.eventId.substring(1))}`;
+                    fragmentPath += '?action=join';
+                    fragmentPath += link.servers.map(server => `&via=${encodeURIComponent(server)}`).join('');
+                    break;
+                case LinkKind.Group:
+                    return;
+            }
+            return `matrix:${fragmentPath}`;
+        }
+    }
+    canInterceptMatrixToLinks(platform) { return false; }
+
+    getLinkInstructions(platform, link) {
+        switch (link.kind) {
+            case LinkKind.User: return [`Type `, style.code(`/invite ${link.identifier}`)];
+            case LinkKind.Room: return [`Type `, style.code(`/join ${link.identifier}`)];
+        }
+    }
+
+    getCopyString(platform, link) {
+        switch (link.kind) {
+            case LinkKind.User: return `/invite ${link.identifier}`;
+            case LinkKind.Room: return `/join ${link.identifier}`;
+        }
+    }
+
+    getInstallLinks(platform) {
+        if (platform === Platform.Linux) {
+            return [new FlathubLink("org.kde.neochat")];
+        }
+    }
+
+    getPreferredWebInstance(link) {}
+}

src/open/clients/Nheko.js

@@ -0,0 +1,85 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {Maturity, Platform, LinkKind, FlathubLink, WebsiteLink, style} from "../types.js";
+
+/**
+ * Information on how to deep link to a given matrix client.
+ */
+export class Nheko {
+    get id() { return "nheko"; }
+    get name() { return "Nheko"; }
+    get icon() { return "images/client-icons/nheko.svg"; }
+    get author() { return "mujx, red_sky, deepbluev7, Konstantinos Sideris"; }
+    get homepage() { return "https://github.com/Nheko-Reborn/nheko"; }
+    get platforms() { return [Platform.Windows, Platform.macOS, Platform.Linux]; }
+    get description() { return 'A native desktop app for Matrix that feels more like a mainstream chat app.'; }
+    getMaturity(platform) { return Maturity.Beta; }
+    getDeepLink(platform, link) {
+        if (platform === Platform.Linux || platform === Platform.Windows) {
+            let identifier = encodeURIComponent(link.identifier.substring(1));
+            let isRoomid = link.identifier.substring(0, 1) === '!';
+            let fragmentPath;
+            switch (link.kind) {
+                case LinkKind.User:
+                    fragmentPath = `u/${identifier}?action=chat`;
+                    break;
+                case LinkKind.Room:
+                case LinkKind.Event:
+                    if (isRoomid)
+                        fragmentPath = `roomid/${identifier}`;
+                    else
+                        fragmentPath = `r/${identifier}`;
+
+                    if (link.kind === LinkKind.Event)
+                        fragmentPath += `/e/${encodeURIComponent(link.eventId.substring(1))}`;
+                    fragmentPath += '?action=join';
+                    fragmentPath += link.servers.map(server => `&via=${encodeURIComponent(server)}`).join('');
+                    break;
+                case LinkKind.Group:
+                    return;
+            }
+            return `matrix:${fragmentPath}`;
+        }
+    }
+    canInterceptMatrixToLinks(platform) { return false; }
+
+    getLinkInstructions(platform, link) {
+        switch (link.kind) {
+            case LinkKind.User: return [`Type `, style.code(`/invite ${link.identifier}`)];
+            case LinkKind.Room: return [`Type `, style.code(`/join ${link.identifier}`)];
+        }
+    }
+
+    getCopyString(platform, link) {
+        switch (link.kind) {
+            case LinkKind.User: return `/invite ${link.identifier}`;
+            case LinkKind.Room: return `/join ${link.identifier}`;
+        }
+    }
+
+    getInstallLinks(platform) {
+        switch (platform) {
+            case Platform.Linux: return [
+                new FlathubLink("io.github.NhekoReborn.Nheko"),
+                new WebsiteLink("https://github.com/Nheko-Reborn/nheko/releases/latest"),
+            ];
+            default: return [new WebsiteLink("https://github.com/Nheko-Reborn/nheko/releases/latest")];
+        }
+    }
+
+    getPreferredWebInstance(link) {}
+}

src/open/clients/Quaternion.js

@@ -0,0 +1,56 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {Maturity, Platform, LinkKind, FlathubLink, WebsiteLink, style} from "../types.js";
+
+export class Quaternion {
+    get id() { return "quaternion"; }
+    get name() { return "Quaternion"; }
+    get icon() { return "images/client-icons/quaternion.svg"; }
+    get author() { return "The Quotient project"; }
+    get homepage() { return "https://github.com/quotient-im/Quaternion"; }
+    get platforms() { return [Platform.Windows, Platform.macOS, Platform.Linux]; }
+    get description() { return 'Qt5 and C++ cross-platform desktop Matrix client.'; }
+    getMaturity(platform) { return Maturity.Beta; }
+    getDeepLink(platform, link) {}
+    canInterceptMatrixToLinks(platform) { return false; }
+
+    getLinkInstructions(platform, link) {
+        switch (link.kind) {
+            case LinkKind.User: return [`Type `, style.code(`/invite ${link.identifier}`)];
+            case LinkKind.Room: return [`Type `, style.code(`/join ${link.identifier}`)];
+        }
+    }
+
+    getCopyString(platform, link) {
+        switch (link.kind) {
+            case LinkKind.User: return `/invite ${link.identifier}`;
+            case LinkKind.Room: return `/join ${link.identifier}`;
+        }
+    }
+
+    getInstallLinks(platform) {
+        switch (platform) {
+            case Platform.Linux: return [
+                new FlathubLink("com.github.quaternion"),
+                new WebsiteLink("https://github.com/quotient-im/Quaternion/releases/latest"),
+            ];
+            default: return [new WebsiteLink("https://github.com/quotient-im/Quaternion/releases/latest")];
+        }
+    }
+
+    getPreferredWebInstance(link) {}
+}

src/open/clients/SchildiChat.js

@@ -0,0 +1,112 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {
+    Maturity, Platform, LinkKind,
+    FDroidLink, FlathubLink, PlayStoreLink, WebsiteLink
+} from "../types.js";
+
+const trustedWebInstances = [
+    "app.schildi.chat",   // first one is the default one
+    "test.schildi.chat",
+];
+
+/**
+ * Information on how to deep link to a given matrix client.
+ */
+export class SchildiChat {
+    get id() { return "schildi.chat"; }
+
+    get platforms() {
+        return [
+            Platform.Android,
+            Platform.Windows, Platform.macOS, Platform.Linux,
+            Platform.DesktopWeb
+        ];
+    }
+
+    get icon() { return "images/client-icons/schildichat.svg"; }
+    get name() { return "SchildiChat"; }
+    get description() { return 'Feature-rich messenger for Matrix based on Element with some extras and tweaks.'; }
+    get homepage() { return "https://schildi.chat"; }
+    get author() { return "SchildiChat team"; }
+    getMaturity(platform) { return Maturity.Stable; }
+
+    getDeepLink(platform, link) {
+        let fragmentPath;
+        switch (link.kind) {
+            case LinkKind.User:
+                fragmentPath = `user/${encodeURIComponent(link.identifier)}`;
+                break;
+            case LinkKind.Room:
+                fragmentPath = `room/${encodeURIComponent(link.identifier)}`;
+                break;
+            case LinkKind.Group:
+                fragmentPath = `group/${encodeURIComponent(link.identifier)}`;
+                break;
+            case LinkKind.Event:
+                fragmentPath = `room/${encodeURIComponent(link.identifier)}/${encodeURIComponent(link.eventId)}`;
+                break;
+        }
+
+        if ((link.kind === LinkKind.Event || link.kind === LinkKind.Room) && link.servers.length > 0) {
+            fragmentPath += '?' + link.servers.map(server => `via=${encodeURIComponent(server)}`).join('&');
+        }
+
+        const isWebPlatform = platform === Platform.DesktopWeb || platform === Platform.MobileWeb;
+        if (isWebPlatform) {
+            let instanceHost = trustedWebInstances[0];
+            if (isWebPlatform && trustedWebInstances.includes(link.webInstances[this.id])) {
+                instanceHost = link.webInstances[this.id];
+            }
+            return `https://${instanceHost}/#/${fragmentPath}`;
+        } else if (platform === Platform.Linux || platform === Platform.Windows || platform === Platform.macOS) {
+            return `schildichat://vector/webapp/#/${fragmentPath}`;
+        } else {
+            return `schildichat://${fragmentPath}`;
+        }
+    }
+
+    getLinkInstructions(platform, link) { }
+    getCopyString(platform, link) { }
+    getInstallLinks(platform) {
+        switch (platform) {
+            case Platform.Linux:
+                return [
+                    new FlathubLink("chat.schildi.desktop"),
+                    new WebsiteLink("https://schildi.chat/desktop/"),
+                ]
+            case Platform.Windows || Platform.macOS:
+                return [new WebsiteLink("https://schildi.chat/desktop/")];
+            case Platform.Android:
+                return [
+                    new PlayStoreLink('de.spiritcroc.riotx'),
+                    new FDroidLink('de.spiritcroc.riotx'),
+                    new WebsiteLink("https://schildi.chat/android/"),
+                ];
+            default: return [new WebsiteLink("https://schildi.chat")];
+        }
+    }
+
+    canInterceptMatrixToLinks(platform) {
+        return platform === Platform.Android;
+    }
+
+    getPreferredWebInstance(link) {
+        const idx = trustedWebInstances.indexOf(link.webInstances[this.id])
+        return idx === -1 ? undefined : trustedWebInstances[idx];
+    }
+}

src/open/clients/Syphon.js

@@ -0,0 +1,91 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+Copyright 2022 0x1a8510f2 <admin@0x1a8510f2.space>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { Maturity, Platform, LinkKind, FlathubLink, AppleStoreLink, PlayStoreLink, FDroidLink, WebsiteLink } from "../types.js";
+
+export class Syphon {
+    get id() { return "org.syphon.syphon"; }
+    get name() { return "Syphon"; }
+    get icon() { return "images/client-icons/syphon.svg"; }
+    get author() { return "Taylor Ereio"; }
+    get homepage() { return "https://syphon.org"; }
+    get platforms() {
+        return [
+            Platform.Android,
+            Platform.iOS,
+            Platform.Linux,
+            Platform.Windows,
+            Platform.macOS,
+            //Platform.DesktopWeb, // Supported by flutter but no builds yet
+        ];
+    }
+    get description() {
+        return "chat with your privacy and freedom intact";
+    }
+
+    getMaturity(platform) {
+        return Maturity.Alpha;
+    }
+
+    getInstallLinks(platform) {
+        switch (platform) {
+            case Platform.Android: return [
+                new PlayStoreLink("org.tether.tether"),
+                new FDroidLink("org.tether.tether"),
+            ];
+            case Platform.iOS: return [
+                new AppleStoreLink("syphon", "id1496285352")
+            ];
+            case Platform.Linux: return [
+                new FlathubLink("org.syphon.Syphon"),
+                new WebsiteLink("https://syphon.org"),
+            ];
+            default: return [new WebsiteLink("https://syphon.org")];
+        }
+    }
+
+    getLinkInstructions(platform, link) {
+        if (link.kind === LinkKind.User) {
+            return "Open the app, click on the direct message button (inside the floating button \
+                    at the bottom), then paste the identifier.";
+        }
+        if (link.kind === LinkKind.Room) {
+            return "Open the app, click on the search public rooms button (inside the floating button \
+                at the bottom), then paste the identifier.";
+        }
+    }
+
+    getCopyString(platform, link) {
+        if (link.kind === LinkKind.User || link.kind === LinkKind.Room) {
+            return link.identifier;
+        }
+    }
+
+    getDeepLink(platform, link) {
+        /*switch (platform) {
+            case Platform.Android: return `org.tether.tether://chat/${link.identifier}`;
+            case Platform.iOS: return `org.tether.tether://chat/${link.identifier}`;
+            default: break;
+        }*/
+    }
+
+    canInterceptMatrixToLinks(platform) {
+        return platform === Platform.Android;
+    }
+
+    getPreferredWebInstance(link) {}
+}

src/open/clients/Tensor.js

@@ -0,0 +1,52 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {Maturity, Platform, LinkKind, FlathubLink,  style} from "../types.js";
+
+export class Tensor {
+    get id() { return "tensor"; }
+    get name() { return "Tensor"; }
+    get icon() { return "images/client-icons/tensor.png"; }
+    get author() { return "David A Roberts"; }
+    get homepage() { return "https://github.com/davidar/tensor"; }
+    get platforms() { return [Platform.Windows, Platform.macOS, Platform.Linux, Platform.Android, Platform.iOS]; }
+    get description() { return 'QML and JS cross-platform desktop Matrix client'; }
+    getMaturity(platform) { return Maturity.Alpha; }
+    getDeepLink(platform, link) {}
+    canInterceptMatrixToLinks(platform) { return false; }
+
+    getLinkInstructions(platform, link) {
+        switch (link.kind) {
+            case LinkKind.User: return [`Type `, style.code(`/invite ${link.identifier}`)];
+            case LinkKind.Room: return [`Type `, style.code(`/join ${link.identifier}`)];
+        }
+    }
+
+    getCopyString(platform, link) {
+        switch (link.kind) {
+            case LinkKind.User: return `/invite ${link.identifier}`;
+            case LinkKind.Room: return `/join ${link.identifier}`;
+        }
+    }
+
+    getInstallLinks(platform) {
+        if (platform === Platform.Android) {
+            return [new FDroidLink("io.davidar.tensor")];
+        }
+    }
+
+    getPreferredWebInstance(link) {}
+}

src/open/clients/Thunderbird.js

@@ -0,0 +1,70 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { Maturity, Platform, LinkKind, FlathubLink, WebsiteLink, style} from "../types.js";
+
+/**
+ * Information on how to deep link to a given matrix client.
+ */
+export class Thunderbird {
+    get id() { return "thunderbird"; }
+    get name() { return "Thunderbird"; }
+    get icon() { return "images/client-icons/thunderbird.svg"; }
+    get author() { return "MZLA Technologies Corporation"; }
+    get homepage() { return "https://www.thunderbird.net"; }
+    get platforms() {
+        return [
+            Platform.Windows, Platform.macOS, Platform.Linux,
+        ];
+    }
+    get description() { return "Thunderbird is a free open-source email, calendar & chat app."; }
+    getMaturity(platform) {
+        return Maturity.Beta;
+    }
+
+    getInstallLinks(platform) {
+        const links = [];
+        if (platform === Platform.Linux) {
+            links.push(new FlathubLink("org.mozilla.Thunderbird"));
+        }
+        links.push(new WebsiteLink(this.homepage));
+        return links;
+    }
+
+    getLinkInstructions(platform, link) {
+        if (link.kind === LinkKind.User) {
+            return "Open the Chat tab, click on 'Add Contact' and paste the username.";
+        }
+        if (link.kind === LinkKind.Room) {
+            return [
+                "Open the Chat tab, click on 'Join Chat' and paste the identifier or type ",
+                style.code(`/join ${link.identifier}`),
+                " in an existing Matrix conversation."
+            ];
+        }
+    }
+
+    getCopyString(platform, link) {
+        if (link.kind === LinkKind.User || link.kind === LinkKind.Room) {
+            return link.identifier;
+        }
+    }
+
+    getDeepLink(platform, link) {}
+
+    canInterceptMatrixToLinks(platform) {
+        return false;
+    }
+
+    getPreferredWebInstance(link) {}
+}

src/open/clients/Weechat.js

@@ -0,0 +1,51 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {Maturity, Platform, LinkKind, WebsiteLink, style} from "../types.js";
+
+/**
+ * Information on how to deep link to a given matrix client.
+ */
+export class Weechat {
+    get id() { return "weechat"; }
+    get name() { return "Weechat"; }
+    get icon() { return "images/client-icons/weechat.svg"; }
+    get author() { return "Poljar"; }
+    get homepage() { return "https://github.com/poljar/weechat-matrix"; }
+    get platforms() { return [Platform.Windows, Platform.macOS, Platform.Linux]; }
+    get description() { return 'Command-line Matrix interface using Weechat.'; }
+    getMaturity(platform) { return Maturity.Beta; }
+    getDeepLink(platform, link) {}
+    canInterceptMatrixToLinks(platform) { return false; }
+
+    getLinkInstructions(platform, link) {
+        switch (link.kind) {
+            case LinkKind.User: return [`Type `, style.code(`/invite ${link.identifier}`)];
+            case LinkKind.Room: return [`Type `, style.code(`/join ${link.identifier}`)];
+        }
+    }
+
+    getCopyString(platform, link) {
+        switch (link.kind) {
+            case LinkKind.User: return `/invite ${link.identifier}`;
+            case LinkKind.Room: return `/join ${link.identifier}`;
+        }
+    }
+
+    getInstallLinks(platform) {}
+
+    getPreferredWebInstance(link) {}
+}

src/open/clients/index.js

@@ -0,0 +1,45 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {Element} from "./Element.js";
+import {SchildiChat} from "./SchildiChat.js";
+import {Weechat} from "./Weechat.js";
+import {Nheko} from "./Nheko.js";
+import {Fractal} from "./Fractal.js";
+import {Quaternion} from "./Quaternion.js";
+import {Tensor} from "./Tensor.js";
+import {Fluffychat} from "./Fluffychat.js";
+import {NeoChat} from "./NeoChat.js";
+import {Syphon} from "./Syphon.js";
+import {Thunderbird} from "./Thunderbird.js";
+import {Cinny} from "./Cinny.js"
+
+export function createClients() {
+    return [
+        new Element(),
+        new SchildiChat(),
+        new Weechat(),
+        new Nheko(),
+        new Fractal(),
+        new Quaternion(),
+        new Tensor(),
+        new Fluffychat(),
+        new NeoChat(),
+        new Syphon(),
+        new Thunderbird(),
+        new Cinny(),
+    ];
+}

src/open/types.js

@@ -0,0 +1,117 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {createEnum} from "../utils/enum.js";
+export const Maturity = createEnum("Alpha", "Beta", "Stable");
+export {LinkKind} from "../Link.js";
+export {Platform} from "../Platform.js";
+
+export class AppleStoreLink {
+    constructor(org, appId) {
+        this._org = org;
+        this._appId = appId;
+    }
+
+    createInstallURL(link) {
+        return `https://apps.apple.com/app/${encodeURIComponent(this._org)}/${encodeURIComponent(this._appId)}`;
+    }
+
+    get channelId() {
+        return "apple-app-store";
+    }
+
+    getDescription() {
+        return "Download on the App Store";
+    }
+}
+
+export class PlayStoreLink {
+    constructor(appId) {
+        this._appId = appId;
+    }
+
+    createInstallURL(link) {
+        return `https://play.google.com/store/apps/details?id=${encodeURIComponent(this._appId)}&referrer=${encodeURIComponent(link.identifier)}`;
+    }
+      
+    get channelId() {
+        return "play-store";
+    }
+
+    getDescription() {
+        return "Get it on Google Play";
+    }
+}
+
+export class FDroidLink {
+    constructor(appId) {
+        this._appId = appId;
+    }
+
+    createInstallURL(link) {
+        return `https://f-droid.org/packages/${encodeURIComponent(this._appId)}`;
+    }
+
+    get channelId() {
+        return "fdroid";
+    }
+
+    getDescription() {
+        return "Get it on F-Droid";
+    }
+}
+
+export class FlathubLink {
+    constructor(appId) {
+        this._appId = appId;
+    }
+
+    createInstallURL(link) {
+        return `https://flathub.org/apps/details/${encodeURIComponent(this._appId)}`;
+    }
+
+    get channelId() {
+        return "flathub";
+    }
+
+    getDescription() {
+        return "Get it on Flathub";
+    }
+}
+
+export class WebsiteLink {
+    constructor(url) {
+        this._url = url;
+    }
+
+    createInstallURL(link) {
+        return this._url;
+    }
+
+    get channelId() {
+        return "website";
+    }
+
+    getDescription(platform) {
+        return `Download for ${platform}`;
+    }
+}
+
+export const style = {
+    code(text) {
+        return {type: "code", text};
+    }
+}

src/policy/LoadServerPolicyView.js

@@ -0,0 +1,26 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {TemplateView} from "../utils/TemplateView.js";
+
+export class LoadServerPolicyView extends TemplateView {
+    render(t, vm) {
+        return t.div({className: "LoadServerPolicyView card"}, [
+            t.div({className: {spinner: true, hidden: vm => !vm.loading}}),
+            t.h2(vm => vm.message)
+        ]);
+    }
+}

src/policy/LoadServerPolicyViewModel.js

@@ -0,0 +1,52 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {ViewModel} from "../utils/ViewModel.js";
+import {resolveServer} from "../preview/HomeServer.js";
+
+export class LoadServerPolicyViewModel extends ViewModel {
+    constructor(options) {
+        super(options);
+        this.server = options.server;
+        this.message = `Looking up ${this.server} privacy policy…`;
+        this.loading = false;
+    }
+
+    async load() {
+        this.loading = true;
+        this.emitChange();
+        try {
+            const homeserver = await resolveServer(this.request, this.server);
+            if (homeserver) {
+                const url = await homeserver.getPrivacyPolicyUrl();
+                if (url) {
+                    this.message = `Loading ${this.server} privacy policy now…`;
+                    this.openLink(url);
+                } else {
+                    this.loading = false;
+                    this.message = `${this.server} does not declare a privacy policy.`;
+                }
+            } else {
+                this.loading = false;
+                this.message = `${this.server} does not look like a matrix homeserver.`;
+            }
+        } catch (err) {
+            this.loading = false;
+            this.message = `Failed to get the privacy policy for ${this.server}`;
+        }
+        this.emitChange();
+    }
+}

src/polyfill.js

@@ -0,0 +1,18 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import "core-js/stable";
+import "regenerator-runtime/runtime";

src/preview/HomeServer.js

@@ -0,0 +1,142 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+function noTrailingSlash(url) {
+    return url.endsWith("/") ? url.slice(0, -1) : url;
+}
+
+export async function resolveServer(request, baseURL) {
+    baseURL = noTrailingSlash(baseURL);
+    if (!baseURL.startsWith("http://") && !baseURL.startsWith("https://")) {
+        baseURL = `https://${baseURL}`;
+    }
+    {
+        try {
+            const {status, body} = await request(`${baseURL}/.well-known/matrix/client`, {method: "GET"}).response();
+            if (status === 200) {
+                const proposedBaseURL = body?.['m.homeserver']?.base_url;
+                if (typeof proposedBaseURL === "string") {
+                    baseURL = noTrailingSlash(proposedBaseURL);
+                }
+            }
+        } catch (e) {
+            console.warn("Failed to fetch ${baseURL}/.well-known/matrix/client", e);
+        }
+    }
+    {
+        const {status} = await request(`${baseURL}/_matrix/client/versions`, {method: "GET"}).response();
+        if (status !== 200) {
+            throw new Error(`Invalid versions response from ${baseURL}`);
+        }
+    }
+    return new HomeServer(request, baseURL);
+}
+
+export class HomeServer {
+    constructor(request, baseURL) {
+        this._request = request;
+        this.baseURL = baseURL;
+    }
+
+    async getUserProfile(userId) {
+        const {body} = await this._request(`${this.baseURL}/_matrix/client/r0/profile/${encodeURIComponent(userId)}`).response();
+        return body;
+    }
+
+    // MSC3266 implementation
+    async getRoomSummary(roomIdOrAlias, viaServers) {
+        let query;
+        if (viaServers.length > 0) {
+            query = "?" + viaServers.map(server => `via=${encodeURIComponent(server)}`).join('&');
+        }
+        const {body, status} = await this._request(`${this.baseURL}/_matrix/client/unstable/im.nheko.summary/rooms/${encodeURIComponent(roomIdOrAlias)}/summary${query}`).response();
+        if (status !== 200) return;
+        return body;
+    }
+
+    async findPublicRoomById(roomId) {
+        const {body, status} = await this._request(`${this.baseURL}/_matrix/client/r0/directory/list/room/${encodeURIComponent(roomId)}`).response();
+        if (status !== 200 || body.visibility !== "public") {
+            return;
+        }
+        let nextBatch;
+        do {
+            const queryParams = encodeQueryParams({limit: 10000, since: nextBatch});
+            const {body, status} = await this._request(`${this.baseURL}/_matrix/client/r0/publicRooms?${queryParams}`).response();
+            nextBatch = body.next_batch;
+            const publicRoom = body.chunk.find(c => c.room_id === roomId);
+            if (publicRoom) {
+                return publicRoom;
+            }
+        } while (nextBatch);
+    }
+
+    async getRoomIdFromAlias(alias) {
+        const {status, body}  = await this._request(`${this.baseURL}/_matrix/client/r0/directory/room/${encodeURIComponent(alias)}`).response();
+        if (status === 200) {
+            return body.room_id;
+        }
+    }
+
+    async getPrivacyPolicyUrl(lang = "en") {
+        const headers = new Map();
+        headers.set("Content-Type", "application/json");
+        const options = {method: "POST", body: "{}", headers};
+        const {status, body}  = await this._request(`${this.baseURL}/_matrix/client/r0/register`, options).response();
+        if (status === 401 && body) {   // Unauthorized
+            const hasTermsStage = body.flows.some(flow => flow.stages.includes("m.login.terms"));
+            if (hasTermsStage) {
+                const privacyPolicy = body.params?.["m.login.terms"]?.policies?.privacy_policy;
+                if (privacyPolicy) {
+                    const firstLang = Object.keys(privacyPolicy).find(k => k !== "version");
+                    let languagePolicy = privacyPolicy[lang] || privacyPolicy[firstLang];
+                    return languagePolicy?.url;
+                }
+            }
+        }
+    }
+
+    mxcUrlThumbnail(url, width, height, method) {
+        const parts = parseMxcUrl(url);
+        if (parts) {
+            const [serverName, mediaId] = parts;
+            const httpUrl = `${this.baseURL}/_matrix/media/r0/thumbnail/${encodeURIComponent(serverName)}/${encodeURIComponent(mediaId)}`;
+            return httpUrl + `?width=${width}&height=${height}&method=${method}`;
+        }
+        return null;
+    }
+}
+
+function parseMxcUrl(url) {
+    const prefix = "mxc://";
+    if (url.startsWith(prefix)) {
+        return url.slice(prefix.length).split("/", 2);
+    } else {
+        return null;
+    }
+}
+
+function encodeQueryParams(queryParams) {
+    return Object.entries(queryParams || {})
+        .filter(([, value]) => value !== undefined)
+        .map(([name, value]) => {
+            if (typeof value === "object") {
+                value = JSON.stringify(value);
+            }
+            return `${encodeURIComponent(name)}=${encodeURIComponent(value)}`;
+        })
+        .join("&");
+}

src/preview/PreviewView.js

@@ -0,0 +1,62 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {TemplateView} from "../utils/TemplateView.js";
+import {ClientListView} from "../open/ClientListView.js";
+import {ClientView} from "../open/ClientView.js";
+
+export class PreviewView extends TemplateView {
+    render(t, vm) {
+        return t.div({className: "PreviewView"}, t.mapView(vm => vm.loading, loading => {
+            return loading ? new LoadingPreviewView(vm) : new LoadedPreviewView(vm);
+        }));
+    }
+}
+
+class LoadingPreviewView extends TemplateView {
+    render(t, vm) {
+        return t.div([
+            t.div({className: "avatarContainer"}, t.div({className: "avatar loading"}, t.div({className: "spinner"}))),
+            t.h1(vm => vm.name),
+            t.p({className: "identifier placeholder"}),
+            t.div({className: {memberCount: true, loading: true, hidden: !vm.hasMemberCount}}, t.p({className: "placeholder"})),
+            t.p({className: {topic: true, loading: true, hidden: !vm.hasTopic}}, [
+                t.div({className: "placeholder"}),
+                t.div({className: "placeholder"}),
+                t.div({className: "placeholder"}),
+            ]),
+        ]);
+    }
+}
+
+class LoadedPreviewView extends TemplateView {
+    render(t, vm) {
+        const avatar = t.map(vm => vm.avatarUrl, (avatarUrl, t) => {
+            if (avatarUrl) {
+                return t.img({className: "avatar", src: avatarUrl});
+            } else {
+                return t.div({className: "defaultAvatar"});
+            }
+        });
+        return t.div({className: vm.isSpaceRoom ? "mxSpace" : undefined}, [
+            t.div({className: "avatarContainer"}, avatar),
+            t.h1(vm => vm.name),
+            t.p({className: {identifier: true, hidden: vm => !vm.identifier}}, vm => vm.identifier),
+            t.div({className: {memberCount: true, hidden: vm => !vm.memberCount}}, t.p([vm => vm.memberCount, " members"])),
+            t.p({className: {topic: true, hidden: vm => !vm.topic}}, [vm => vm.topic]),
+        ]);
+    }
+}

src/preview/PreviewViewModel.js

@@ -0,0 +1,125 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {LinkKind, IdentifierKind} from "../Link.js";
+import {ViewModel} from "../utils/ViewModel.js";
+import {resolveServer} from "./HomeServer.js";
+import {ClientListViewModel} from "../open/ClientListViewModel.js";
+import {ClientViewModel} from "../open/ClientViewModel.js";
+
+export class PreviewViewModel extends ViewModel {
+    constructor(options) {
+        super(options);
+        const { link, consentedServers } = options;
+        this._link = link;
+        this._consentedServers = consentedServers;
+        this.loading = false;
+        this.name = this._link.identifier;
+        this.avatarUrl = null;
+        this.identifier = null;
+        this.memberCount = null;
+        this.topic = null;
+        this.domain = null;
+        this.failed = false;
+        this.isSpaceRoom = false;
+    }
+
+    async load() {
+        const {kind} = this._link; 
+        const supportsPreview = kind === LinkKind.User || kind === LinkKind.Room || kind === LinkKind.Event;
+        if (supportsPreview) {
+            this.loading = true;
+            this.emitChange();
+            for (const server of this._consentedServers) {
+                try {
+                    const homeserver = await resolveServer(this.request, server);
+                    switch (this._link.kind) {
+                        case LinkKind.User:
+                            await this._loadUserPreview(homeserver, this._link.identifier);
+                            break;
+                        case LinkKind.Room:
+                        case LinkKind.Event:
+                            await this._loadRoomPreview(homeserver, this._link);
+                            break;
+                    }
+                    // assume we're done if nothing threw
+                    this.domain = server;
+                    this.loading = false;
+                    this.emitChange();
+                    return;
+                } catch (err) {
+                    continue;
+                }
+            }
+        }
+
+        this.loading = false;
+        this._setNoPreview(this._link);
+        if (this._consentedServers.length && supportsPreview) {
+            this.domain = this._consentedServers[this._consentedServers.length - 1];
+            this.failed = true;
+        }
+        this.emitChange();
+    }
+
+    get hasTopic() { return this._link.kind === LinkKind.Room; }
+    get hasMemberCount() { return this.hasTopic; }
+
+    async _loadUserPreview(homeserver, userId) {
+        const profile = await homeserver.getUserProfile(userId);
+        this.name = profile.displayname || userId;
+        this.avatarUrl = profile.avatar_url ?
+            homeserver.mxcUrlThumbnail(profile.avatar_url, 64, 64, "crop") :
+            null;
+        this.identifier = userId;
+    }
+
+    async _loadRoomPreview(homeserver, link) {
+        let publicRoom;
+        if (link.identifierKind === IdentifierKind.RoomId || link.identifierKind === IdentifierKind.RoomAlias) {
+            publicRoom = await homeserver.getRoomSummary(link.identifier, link.servers);
+        }
+
+        if (!publicRoom) {
+            if (link.identifierKind === IdentifierKind.RoomId) {
+                publicRoom = await homeserver.findPublicRoomById(link.identifier);
+            } else if (link.identifierKind === IdentifierKind.RoomAlias) {
+                const roomId = await homeserver.getRoomIdFromAlias(link.identifier);
+                if (roomId) {
+                    publicRoom = await homeserver.findPublicRoomById(roomId);
+                }
+            }
+        }
+
+        this.name = publicRoom?.name || publicRoom?.canonical_alias || link.identifier;
+        this.avatarUrl = publicRoom?.avatar_url ?
+            homeserver.mxcUrlThumbnail(publicRoom.avatar_url, 64, 64, "crop") :
+            null;
+        this.memberCount = publicRoom?.num_joined_members;
+        this.topic = publicRoom?.topic;
+        this.identifier = publicRoom?.canonical_alias || link.identifier;
+        this.isSpaceRoom = publicRoom?.room_type === "m.space";
+        if (this.identifier === this.name) {
+            this.identifier = null;
+        }
+    }
+
+    _setNoPreview(link) {
+        this.name = link.identifier;
+        this.identifier = null;
+        this.avatarUrl = null;
+    }
+}

src/utils/TemplateView.js

@@ -0,0 +1,370 @@
+/*
+Copyright 2020 Bruno Windels <bruno@windels.cloud>
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { setAttribute, text, isChildren, classNames, TAG_NAMES, HTML_NS } from "./html.js";
+
+/**
+    Bindable template. Renders once, and allows bindings for given nodes. If you need
+    to change the structure on a condition, use a subtemplate (if)
+
+    supports
+        - event handlers (attribute fn value with name that starts with on)
+        - one way binding of attributes (other attribute fn value)
+        - one way binding of text values (child fn value)
+        - refs to get dom nodes
+        - className binding returning object with className => enabled map
+        - add subviews inside the template
+*/
+// TODO: should we rename this to BoundView or something? As opposed to StaticView ...
+export class TemplateView {
+    constructor(value, render = undefined) {
+        this._value = value;
+        // TODO: can avoid this if we have a separate class for inline templates vs class template views
+        this._render = render;
+        this._eventListeners = null;
+        this._bindings = null;
+        this._subViews = null;
+        this._root = null;
+        // TODO: can avoid this if we adopt the handleEvent pattern in our EventListener
+        this._boundUpdateFromValue = null;
+    }
+
+    get value() {
+        return this._value;
+    }
+
+    _subscribe() {
+        if (typeof this._value?.on === "function") {
+            this._boundUpdateFromValue = this._updateFromValue.bind(this);
+            this._value.on("change", this._boundUpdateFromValue);
+        }
+    }
+
+    _unsubscribe() {
+        if (this._boundUpdateFromValue) {
+            if (typeof this._value.off === "function") {
+                this._value.off("change", this._boundUpdateFromValue);
+            }
+            this._boundUpdateFromValue = null;
+        }
+    }
+
+    _attach() {
+        if (this._eventListeners) {
+            for (let {node, name, fn, useCapture} of this._eventListeners) {
+                node.addEventListener(name, fn, useCapture);
+            }
+        }
+    }
+
+    _detach() {
+        if (this._eventListeners) {
+            for (let {node, name, fn, useCapture} of this._eventListeners) {
+                node.removeEventListener(name, fn, useCapture);
+            }
+        }
+    }
+
+    mount(options) {
+        const builder = new TemplateBuilder(this);
+        if (this._render) {
+            this._root = this._render(builder, this._value);
+        } else if (this.render) {   // overriden in subclass
+            this._root = this.render(builder, this._value);
+        } else {
+            throw new Error("no render function passed in, or overriden in subclass");
+        }
+        const parentProvidesUpdates = options && options.parentProvidesUpdates;
+        if (!parentProvidesUpdates) {
+            this._subscribe();
+        }
+        this._attach();
+        return this._root;
+    }
+
+    unmount() {
+        this._detach();
+        this._unsubscribe();
+        if (this._subViews) {
+            for (const v of this._subViews) {
+                v.unmount();
+            }
+        }
+    }
+
+    root() {
+        return this._root;
+    }
+
+    _updateFromValue(changedProps) {
+        this.update(this._value, changedProps);
+    }
+
+    update(value) {
+        this._value = value;
+        if (this._bindings) {
+            for (const binding of this._bindings) {
+                binding();
+            }
+        }
+    }
+
+    _addEventListener(node, name, fn, useCapture = false) {
+        if (!this._eventListeners) {
+            this._eventListeners = [];
+        }
+        this._eventListeners.push({node, name, fn, useCapture});
+    }
+
+    _addBinding(bindingFn) {
+        if (!this._bindings) {
+            this._bindings = [];
+        }
+        this._bindings.push(bindingFn);
+    }
+
+    addSubView(view) {
+        if (!this._subViews) {
+            this._subViews = [];
+        }
+        this._subViews.push(view);
+    }
+
+    removeSubView(view) {
+        const idx = this._subViews.indexOf(view);
+        if (idx !== -1) {
+            this._subViews.splice(idx, 1);
+        }
+    }
+}
+
+// what is passed to render
+class TemplateBuilder {
+    constructor(templateView) {
+        this._templateView = templateView;
+    }
+
+    get _value() {
+        return this._templateView._value;
+    }
+
+    addEventListener(node, name, fn, useCapture = false) {
+        this._templateView._addEventListener(node, name, fn, useCapture);
+    }
+
+    _addAttributeBinding(node, name, fn) {
+        let prevValue = undefined;
+        const binding = () => {
+            const newValue = fn(this._value);
+            if (prevValue !== newValue) {
+                prevValue = newValue;
+                setAttribute(node, name, newValue);
+            }
+        };
+        this._templateView._addBinding(binding);
+        binding();
+    }
+
+    _addClassNamesBinding(node, obj) {
+        this._addAttributeBinding(node, "className", value => classNames(obj, value));
+    }
+
+    _addTextBinding(fn) {
+        const initialValue = fn(this._value);
+        const node = text(initialValue);
+        let prevValue = initialValue;
+        const binding = () => {
+            const newValue = fn(this._value);
+            if (prevValue !== newValue) {
+                prevValue = newValue;
+                node.textContent = newValue+"";
+            }
+        };
+
+        this._templateView._addBinding(binding);
+        return node;
+    }
+
+    _setNodeAttributes(node, attributes) {
+        for(let [key, value] of Object.entries(attributes)) {
+            const isFn = typeof value === "function";
+            // binding for className as object of className => enabled
+            if (key === "className" && typeof value === "object" && value !== null) {
+                if (objHasFns(value)) {
+                    this._addClassNamesBinding(node, value);
+                } else {
+                    setAttribute(node, key, classNames(value));
+                }
+            } else if (key.startsWith("on") && key.length > 2 && isFn) {
+                const eventName = key.slice(2, 3).toLowerCase() + key.slice(3);
+                const handler = value;
+                this._templateView._addEventListener(node, eventName, handler);
+            } else if (isFn) {
+                this._addAttributeBinding(node, key, value);
+            } else {
+                setAttribute(node, key, value);
+            }
+        }
+    }
+
+    _setNodeChildren(node, children) {
+        if (!Array.isArray(children)) {
+            children = [children];
+        }
+        for (let child of children) {
+            if (typeof child === "function") {
+                child = this._addTextBinding(child);
+            } else if (!child.nodeType) {
+                // not a DOM node, turn into text
+                child = text(child);
+            }
+            node.appendChild(child);
+        }
+    }
+    
+    _addReplaceNodeBinding(fn, renderNode) {
+        let prevValue = fn(this._value);
+        let node = renderNode(null);
+
+        const binding = () => {
+            const newValue = fn(this._value);
+            if (prevValue !== newValue) {
+                prevValue = newValue;
+                const newNode = renderNode(node);
+                if (node.parentNode) {
+                    node.parentNode.replaceChild(newNode, node);
+                }
+                node = newNode;
+            }
+        };
+        this._templateView._addBinding(binding);
+        return node;
+    }
+
+    el(name, attributes, children) {
+        return this.elNS(HTML_NS, name, attributes, children);
+    }
+
+    elNS(ns, name, attributes, children) {
+        if (attributes && isChildren(attributes)) {
+            children = attributes;
+            attributes = null;
+        }
+
+        const node = document.createElementNS(ns, name);
+        
+        if (attributes) {
+            this._setNodeAttributes(node, attributes);
+        }
+        if (children) {
+            this._setNodeChildren(node, children);
+        }
+
+        return node;
+    }
+
+    // this insert a view, and is not a view factory for `if`, so returns the root element to insert in the template
+    // you should not call t.view() and not use the result (e.g. attach the result to the template DOM tree).
+    view(view) {
+        let root;
+        try {
+            root = view.mount();
+        } catch (err) {
+            return errorToDOM(err);
+        }
+        this._templateView.addSubView(view);
+        return root;
+    }
+
+    // map a value to a view, every time the value changes
+    mapView(mapFn, viewCreator) {
+        return this._addReplaceNodeBinding(mapFn, (prevNode) => {
+            if (prevNode && prevNode.nodeType !== Node.COMMENT_NODE) {
+                const subViews = this._templateView._subViews;
+                const viewIdx = subViews.findIndex(v => v.root() === prevNode);
+                if (viewIdx !== -1) {
+                    const [view] = subViews.splice(viewIdx, 1);
+                    view.unmount();
+                }
+            }
+            const view = viewCreator(mapFn(this._value));
+            if (view) {
+                return this.view(view);
+            } else {
+                return document.createComment("node binding placeholder");
+            }
+        });
+    }
+
+    // Special case of mapView for a TemplateView.
+    // Always creates a TemplateView, if this is optional depending
+    // on mappedValue, use `if` or `mapView`
+    map(mapFn, renderFn) {
+        return this.mapView(mapFn, mappedValue => {
+            return new TemplateView(this._value, (t, vm) => {
+                const rootNode = renderFn(mappedValue, t, vm);
+                if (!rootNode) {
+                    // TODO: this will confuse mapView which assumes that
+                    // a comment node means there is no view to clean up
+                    return document.createComment("map placeholder");
+                }
+                return rootNode;
+            });
+        });
+    }
+
+    ifView(predicate, viewCreator) {
+        return this.mapView(
+            value => !!predicate(value),
+            enabled => enabled ? viewCreator(this._value) : null
+        );
+    }
+
+    // creates a conditional subtemplate
+    // use mapView if you need to map to a different view class
+    if(predicate, renderFn) {
+        return this.ifView(predicate, vm => new TemplateView(vm, renderFn));
+    }
+}
+
+function errorToDOM(error) {
+    const stack = new Error().stack;
+    const callee = stack.split("\n")[1];
+    return tag.div([
+        tag.h2("Something went wrong…"),
+        tag.h3(error.message),
+        tag.p(`This occurred while running ${callee}.`),
+        tag.pre(error.stack),
+    ]);
+}
+
+function objHasFns(obj) {
+    for(const value of Object.values(obj)) {
+        if (typeof value === "function") {
+            return true;
+        }
+    }
+    return false;
+}
+
+for (const [ns, tags] of Object.entries(TAG_NAMES)) {
+    for (const tag of tags) {
+        TemplateBuilder.prototype[tag] = function(attributes, children) {
+            return this.elNS(ns, tag, attributes, children);
+        };
+    }
+}

src/utils/ViewModel.js

@@ -0,0 +1,78 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+export class EventEmitter {
+    constructor() {
+        this._handlersByName = {};
+    }
+
+    emit(name, ...values) {
+        const handlers = this._handlersByName[name];
+        if (handlers) {
+            for(const h of handlers) {
+                h(...values);
+            }
+        }
+    }
+
+    on(name, callback) {
+        let handlers = this._handlersByName[name];
+        if (!handlers) {
+            this._handlersByName[name] = handlers = new Set();
+        }
+        handlers.add(callback);
+        return () => {
+            this.off(name, callback);
+        }
+    }
+
+    off(name, callback) {
+        const handlers = this._handlersByName[name];
+        if (handlers) {
+            handlers.delete(callback);
+            if (handlers.length === 0) {
+                delete this._handlersByName[name];
+            }
+        }
+    }
+}
+
+export class ViewModel extends EventEmitter {
+    constructor(options) {
+        super();
+        this._options = options;
+    }
+
+    emitChange() {
+        this.emit("change");
+    }
+
+    get request() { return this._options.request; }
+    get origin() { return this._options.origin; }
+    get openLink() { return this._options.openLink; }
+    get platforms() { return this._options.platforms; }
+    get preferences() { return this._options.preferences; }
+
+    childOptions(options = {}) {
+        return Object.assign({
+            request: this.request,
+            origin: this.origin,
+            openLink: this.openLink,
+            platforms: this.platforms,
+            preferences: this.preferences,
+        }, options);
+    }
+}

src/utils/copy.js

@@ -0,0 +1,49 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+function selectNode(node) {
+    const selection = window.getSelection();
+    selection.removeAllRanges();
+    const range = document.createRange();
+    range.selectNode(node);
+    selection.addRange(range);
+}
+
+export function copy(text, parent) {
+    const span = document.createElement("span");
+    span.innerText = text;
+    parent.appendChild(span);
+    selectNode(span);
+    const result = document.execCommand("copy");
+    parent.removeChild(span);
+    return result;
+}
+
+export function copyButton(t, getCopyText, label, classNames) {
+    return t.button({className: `${classNames} icon copy`, onClick: evt => {
+        const button = evt.target;
+        if (copy(getCopyText(), button)) {
+            button.innerText = "Copied!";
+            button.classList.remove("copy");
+            button.classList.add("tick");
+            setTimeout(() => {
+                button.classList.remove("tick");
+                button.classList.add("copy");
+                button.innerText = label;
+            }, 2000);
+        }
+    }}, label);
+}

src/utils/enum.js

@@ -0,0 +1,26 @@
+/*
+Copyright 2020 Bruno Windels <bruno@windels.cloud>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+export function createEnum(...values) {
+    const obj = {};
+    for (const value of values) {
+        if (typeof value !== "string") {
+            throw new Error("Invalid enum value name" + value?.toString());
+        }
+        obj[value] = value;
+    }
+    return Object.freeze(obj);
+}

src/utils/error.js

@@ -0,0 +1,32 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+export class ConnectionError extends Error {
+    constructor(message, isTimeout) {
+        super(message || "ConnectionError");
+        this.isTimeout = isTimeout;
+    }
+
+    get name() {
+        return "ConnectionError";
+    }
+}
+
+export class AbortError extends Error {
+    get name() {
+        return "AbortError";
+    }
+}

src/utils/html.js

@@ -0,0 +1,111 @@
+/*
+Copyright 2020 Bruno Windels <bruno@windels.cloud>
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// DOM helper functions
+
+export function isChildren(children) {
+    // children should be an not-object (that's the attributes), or a domnode, or an array
+    return typeof children !== "object" || !!children.nodeType || Array.isArray(children);
+}
+
+export function classNames(obj, value) {
+    return Object.entries(obj).reduce((cn, [name, enabled]) => {
+        if (typeof enabled === "function") {
+            enabled = enabled(value);
+        }
+        if (enabled) {
+            return cn + (cn.length ? " " : "") + name;
+        } else {
+            return cn;
+        }
+    }, "");
+}
+
+export function setAttribute(el, name, value) {
+    if (name === "className") {
+        name = "class";
+    }
+    if (value === false) {
+        el.removeAttribute(name);
+    } else {
+        if (value === true) {
+            value = name;
+        }
+        el.setAttribute(name, value);
+    }
+}
+
+export function el(elementName, attributes, children) {
+    return elNS(HTML_NS, elementName, attributes, children);
+}
+
+export function elNS(ns, elementName, attributes, children) {
+    if (attributes && isChildren(attributes)) {
+        children = attributes;
+        attributes = null;
+    }
+
+    const e = document.createElementNS(ns, elementName);
+
+    if (attributes) {
+        for (let [name, value] of Object.entries(attributes)) {
+            if (name === "className" && typeof value === "object" && value !== null) {
+                value = classNames(value);
+            }
+            setAttribute(e, name, value);
+        }
+    }
+
+    if (children) {
+        if (!Array.isArray(children)) {
+            children = [children];
+        }
+        for (let c of children) {
+            if (!c.nodeType) {
+                c = text(c);
+            }
+            e.appendChild(c);
+        }
+    }
+    return e;
+}
+
+export function text(str) {
+    return document.createTextNode(str);
+}
+
+export const HTML_NS = "http://www.w3.org/1999/xhtml";
+export const SVG_NS = "http://www.w3.org/2000/svg";
+
+export const TAG_NAMES = {
+    [HTML_NS]: [
+        "br", "a", "ol", "ul", "li", "div", "h1", "h2", "h3", "h4", "h5", "h6",
+        "p", "strong", "em", "span", "img", "section", "main", "article", "aside",
+        "pre", "button", "time", "input", "textarea", "label", "form", "progress", "output", "code"],
+    [SVG_NS]: ["svg", "circle"]
+};
+
+export const tag = {};
+
+
+for (const [ns, tags] of Object.entries(TAG_NAMES)) {
+    for (const tagName of tags) {
+        tag[tagName] = function(attributes, children) {
+            return elNS(ns, tagName, attributes, children);
+        }
+    }
+}

src/utils/unique.js

@@ -0,0 +1,25 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+export function orderedUnique(array) {
+    const copy = [];
+    for (let i = 0; i < array.length; ++i) {
+        if (i === 0 || array.lastIndexOf(array[i], i - 1) === -1) {
+            copy.push(array[i]);
+        }
+    }
+    return copy;
+}

src/utils/xhr.js

@@ -0,0 +1,100 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {
+    AbortError,
+    ConnectionError
+} from "./error.js";
+
+function addCacheBuster(urlStr, random = Math.random) {
+    // XHR doesn't have a good way to disable cache,
+    // so add a random query param
+    // see https://davidtranscend.com/blog/prevent-ie11-cache-ajax-requests/
+    if (urlStr.includes("?")) {
+        urlStr = urlStr + "&";
+    } else {
+        urlStr = urlStr + "?";
+    }
+    return urlStr + `_cacheBuster=${Math.ceil(random() * Number.MAX_SAFE_INTEGER)}`;
+}
+
+class RequestResult {
+    constructor(promise, xhr) {
+        this._promise = promise;
+        this._xhr = xhr;
+    }
+
+    abort() {
+        this._xhr.abort();
+    }
+
+    response() {
+        return this._promise;
+    }
+}
+
+function createXhr(url, {method, headers, timeout, uploadProgress}) {
+    const xhr = new XMLHttpRequest();
+    xhr.open(method, url);
+
+    if (headers) {
+        for(const [name, value] of headers.entries()) {
+            try {
+                xhr.setRequestHeader(name, value);
+            } catch (err) {
+                console.info(`Could not set ${name} header: ${err.message}`);
+            }
+        }
+    }
+    if (timeout) {
+        xhr.timeout = timeout;
+    }
+
+    if (uploadProgress) {
+        xhr.upload.addEventListener("progress", evt => uploadProgress(evt.loaded));
+    }
+
+    return xhr;
+}
+
+function xhrAsPromise(xhr, method, url) {
+    return new Promise((resolve, reject) => {
+        xhr.addEventListener("load", () => resolve(xhr));
+        xhr.addEventListener("abort", () => reject(new AbortError()));
+        xhr.addEventListener("error", () => reject(new ConnectionError(`Error ${method} ${url}`)));
+        xhr.addEventListener("timeout", () => reject(new ConnectionError(`Timeout ${method} ${url}`, true)));
+    });
+}
+
+export function xhrRequest(url, options = {}) {
+    if (!options.method) {
+        options.method = "GET";
+    }
+    let {cache, body, method} = options;
+    if (!cache) {
+        url = addCacheBuster(url);
+    }
+    const xhr = createXhr(url, options);
+    const promise = xhrAsPromise(xhr, method, url).then(xhr => {
+        const {status} = xhr;
+        const body = JSON.parse(xhr.responseText);
+        return {status, body};
+    });
+    
+    xhr.send(body || null);
+
+    return new RequestResult(promise, xhr);
+}