implement homeserver consent stage

css/main.css

@@ -61,6 +61,11 @@ textarea {
     font-style: normal;
 }
 
+button, input {
+    font-size: inherit;
+    font-weight: inherit;
+}
+
 .RootView {
     margin: 0 auto;
 	max-width: 480px;
@@ -174,6 +179,39 @@ input[type='text'].large {
     box-sizing: border-box;
 }
 
+.ServerConsentView .actions {
+    margin-top: 24px;
+    display: flex;
+    align-items: center;
+}
+
+.ServerConsentView input[type=submit] {
+    flex: 1;
+    margin-left: 12px;
+}
+
+.ServerOptions div {
+    margin: 8px 0;
+}
+
+.ServerOptions label {
+    display: flex;
+    align-items: center;
+}
+
+.ServerOptions label > span,
+.ServerOptions label > .line {
+    margin-left: 8px;
+}
+
+.ServerOptions label > .line {
+    flex: 1;
+    border: none;
+    border-bottom: 1px solid var(--grey);
+    padding: 4px 0;
+}
+
+
 .LoadServerPolicyView {
     display: flex;
 }

src/Preferences.js

@@ -22,7 +22,7 @@ export class Preferences {
 		this.clientId = null;
 		// used to differentiate web from native if a client supports both
 		this.platform = null;
-		this.homeservers = [];
+		this.homeservers = null;
 
 		const prefsStr = localStorage.getItem("preferred_client");
 		if (prefsStr) {
@@ -30,6 +30,10 @@ export class Preferences {
 			this.clientId = id;
 			this.platform = Platform[platform];
 		}
+        const serversStr = localStorage.getItem("consented_servers");
+        if (serversStr) {
+            this.homeservers = JSON.parse(serversStr);
+        }
 	}
 
 	setClient(id, platform) {
@@ -40,16 +44,19 @@ export class Preferences {
 	}
 
 	setHomeservers(homeservers) {
-
+        this.homeservers = homeservers;
+        this._localStorage.setItem("consented_servers", JSON.stringify(homeservers));
 	}
 
 	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; 
+		return !!this.clientId || !!this.platform || !!this.homeservers; 
 	}
 }

src/RootViewModel.js

@@ -37,10 +37,8 @@ export class RootViewModel extends ViewModel {
 			if (!oldLink || !oldLink.equals(this.link)) {
 				this.openLinkViewModel = new OpenLinkViewModel(this.childOptions({
 					link: this.link,
-					consentedServers: this.link.servers,
 					clients: createClients()
 				}));
-				this.openLinkViewModel.load();
 			}
 		} else {
 			this.openLinkViewModel = null;

src/open/OpenLinkView.js

@@ -17,10 +17,22 @@ 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.p({className: {accept: true, hidden: vm => vm.clientsViewModel}}, t.button({
                 className: "primary fullwidth",

src/open/OpenLinkViewModel.js

@@ -18,25 +18,43 @@ 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";
 
 export class OpenLinkViewModel extends ViewModel {
 	constructor(options) {
 		super(options);
-		const {clients, link, consentedServers} = options;
+		const {clients, link} = options;
 		this._link = link;
 		this._clients = clients;
-		this.previewViewModel = new PreviewViewModel(this.childOptions({link, consentedServers}));
+        this.serverConsentViewModel = null;
+		this.previewViewModel = null;
+        this.clientsViewModel = null;
 		this.previewLoading = false;
-		const preferredClient = this.preferences.clientId ? clients.find(c => c.id === this.preferences.clientId) : null;
-		this.clientsViewModel = preferredClient ? new ClientListViewModel(this.childOptions({
-			clients,
-			link,
-			client: preferredClient,
-		})) : null;
+        if (this.preferences.homeservers === null) {
+            this.serverConsentViewModel = new ServerConsentViewModel(this.childOptions({
+                servers: this._link.servers,
+                done: () => {
+                    this.serverConsentViewModel = null;
+                    this._showLink();
+                }
+            }));
+        } else {
+            this._showLink();
+        }
 	}
 
-	async load() {
+    async _showLink() {
+        const preferredClient = this.preferences.clientId ? this._clients.find(c => c.id === this.preferences.clientId) : null;
+        this.clientsViewModel = preferredClient ? new ClientListViewModel(this.childOptions({
+            clients: this._clients,
+            link: this._link,
+            client: preferredClient,
+        })) : null;
+        this.previewViewModel = new PreviewViewModel(this.childOptions({
+            link: this._link,
+            consentedServers: this.preferences.homeservers
+        }));
 		this.previewLoading = true;	
 		this.emitChange();
 		await this.previewViewModel.load();

src/open/ServerConsentView.js

@@ -0,0 +1,118 @@
+/*
+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()
+        }, "continue without a preview");
+		return t.div({className: "ServerConsentView"}, [
+            t.p([
+                "View this link using ",
+                t.strong(vm => vm.selectedServer || "…"),
+                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}}, [
+                    " to preview content, or your can ",
+                    useAnotherServer,
+                ]),
+                " or ",
+                continueWithoutPreview,
+                "."
+            ]),
+            t.form({action: "#", 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: "persist"}), "Ask every time"]),
+                    t.input({type: "submit", value: "Continue", className: "primary fullwidth"})
+                ])
+            ])
+        ]);
+	}
+
+    _onSubmit(evt) {
+        evt.preventDefault();
+        this.value.continueWithSelection();
+    }
+}
+
+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}), 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",
+                pattern: "((?:[0-9a-zA-Z][0-9a-zA-Z-]{1,61}\\.)*)(xn--[a-z0-9]+|[a-z]+)",
+                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") {
+            this.value.selectServer(value);
+        }
+    }
+
+    _onChangeServerRadio(radio) {
+        let {value, form} = radio;
+        const {otherServer} = form.elements;
+        if (value === "other") {
+            otherServer.required = true;
+            value = otherServer.value;
+        } else {
+            otherServer.required = false;
+        }
+        this.value.selectServer(value);
+    }
+}

src/open/ServerConsentViewModel.js

@@ -0,0 +1,54 @@
+/*
+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";
+
+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();
+    }
+
+    continueWithSelection() {
+        // keep previously consented servers
+        const homeservers = this.preferences.homeservers || [];
+        homeservers.unshift(this.selectedServer);
+        this.preferences.setHomeservers(homeservers);
+        this.done();
+    }
+
+    continueWithoutConsent() {
+        this.preferences.setHomeservers([]);
+        this.done();
+    }
+}