Speak to Khoj from the Web client

- Use icons to style speech to text recording state

src/khoj/interface/web/assets/icons/microphone-solid.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 384 512"><!--! Font Awesome Pro 6.4.2 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license (Commercial License) Copyright 2023 Fonticons, Inc. --><path d="M192 0C139 0 96 43 96 96V256c0 53 43 96 96 96s96-43 96-96V96c0-53-43-96-96-96zM64 216c0-13.3-10.7-24-24-24s-24 10.7-24 24v40c0 89.1 66.2 162.7 152 174.4V464H120c-13.3 0-24 10.7-24 24s10.7 24 24 24h72 72c13.3 0 24-10.7 24-24s-10.7-24-24-24H216V430.4c85.8-11.7 152-85.3 152-174.4V216c0-13.3-10.7-24-24-24s-24 10.7-24 24v40c0 70.7-57.3 128-128 128s-128-57.3-128-128V216z"/></svg>

src/khoj/interface/web/assets/icons/stop-solid.svg

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   viewBox="0 0 384 512"
+   version="1.1"
+   id="svg1"
+   sodipodi:docname="stop-solid.svg"
+   inkscape:version="1.3 (0e150ed, 2023-07-21)"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs1" />
+  <sodipodi:namedview
+     id="namedview1"
+     pagecolor="#ffffff"
+     bordercolor="#000000"
+     borderopacity="0.25"
+     inkscape:showpageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     inkscape:zoom="0.4609375"
+     inkscape:cx="192"
+     inkscape:cy="256"
+     inkscape:window-width="1312"
+     inkscape:window-height="449"
+     inkscape:window-x="0"
+     inkscape:window-y="88"
+     inkscape:window-maximized="0"
+     inkscape:current-layer="svg1" />
+  <!--! Font Awesome Pro 6.4.2 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license (Commercial License) Copyright 2023 Fonticons, Inc. -->
+  <path
+     d="M0 128C0 92.7 28.7 64 64 64H320c35.3 0 64 28.7 64 64V384c0 35.3-28.7 64-64 64H64c-35.3 0-64-28.7-64-64V128z"
+     id="path1"
+     style="fill:#aa0000" />
+</svg>

src/khoj/interface/web/chat.html

@@ -369,6 +369,56 @@ To get started, just start typing below. You can also type / to see a list of co
                 chat();
             }
         }
+
+        let mediaRecorder;
+        function speechToText() {
+            const speakButton = document.getElementById('speak-button');
+            const speakButtonImg = document.getElementById('speak-button-img');
+            const chatInput = document.getElementById('chat-input');
+
+            const sendToServer = (audioBlob) => {
+                const formData = new FormData();
+                formData.append('file', audioBlob);
+
+                fetch('/api/speak?client=web', { method: 'POST', body: formData })
+                    .then(response => response.ok ? response.json() : Promise.reject(response))
+                    .then(data => { chatInput.value += data.text; })
+                    .catch(err => err.status == 422 ? console.error("Configure speech-to-text model on server.") : console.error("Failed to transcribe audio"));
+            };
+
+            const handleRecording = (stream) => {
+                const audioChunks = [];
+                const recordingConfig = { mimeType: 'audio/webm' };
+                mediaRecorder = new MediaRecorder(stream, recordingConfig);
+
+                mediaRecorder.addEventListener("dataavailable", function(event) {
+                    if (event.data.size > 0) audioChunks.push(event.data);
+                });
+
+                mediaRecorder.addEventListener("stop", function() {
+                    const audioBlob = new Blob(audioChunks, { type: 'audio/webm' });
+                    sendToServer(audioBlob);
+                });
+
+                mediaRecorder.start();
+                speakButtonImg.src = '/static/assets/icons/stop-solid.svg';
+                speakButtonImg.alt = 'Stop Speaking';
+            };
+
+            // Toggle recording
+            if (!mediaRecorder || mediaRecorder.state === 'inactive') {
+                navigator.mediaDevices
+                .getUserMedia({ audio: true })
+                .then(handleRecording)
+                .catch((e) => {
+                    console.error(e);
+                });
+            } else if (mediaRecorder.state === 'recording') {
+                mediaRecorder.stop();
+                speakButtonImg.src = '/static/assets/icons/microphone-solid.svg';
+                speakButtonImg.alt = 'Speak';
+            }
+        }
     </script>
     <body>
         <div id="khoj-empty-container" class="khoj-empty-container">
@@ -384,7 +434,12 @@ To get started, just start typing below. You can also type / to see a list of co
         <!-- Chat Footer -->
         <div id="chat-footer">
             <div id="chat-tooltip" style="display: none;"></div>
+            <div id="input-row">
                 <textarea id="chat-input" class="option" oninput="onChatInput()" onkeydown=incrementalChat(event) autofocus="autofocus" placeholder="Type / to see a list of commands, or just type your questions and hit enter."></textarea>
+                <button id="speak-button" onclick="speechToText()">
+                    <img id="speak-button-img" src="/static/assets/icons/microphone-solid.svg" alt="Speak"></img>
+                </button>
+            </div>
         </div>
     </body>
     <script>
@@ -580,15 +635,17 @@ To get started, just start typing below. You can also type / to see a list of co
 
         #chat-footer {
             padding: 0;
+            margin: 8px;
             display: grid;
             grid-template-columns: minmax(70px, 100%);
             grid-column-gap: 10px;
             grid-row-gap: 10px;
         }
-        #chat-footer > * {
-            padding: 15px;
-            border-radius: 5px;
-            border: 1px solid var(--main-text-color);
+        #input-row {
+            display: grid;
+            grid-template-columns: auto 32px;
+            grid-column-gap: 10px;
+            grid-row-gap: 10px;
             background: #f9fafc
         }
         .option:hover {
@@ -609,6 +666,26 @@ To get started, just start typing below. You can also type / to see a list of co
         #chat-input:focus {
             outline: none !important;
         }
+        #speak-button {
+            background: var(--background-color);
+            border: none;
+            border-radius: 5px;
+            padding: 5px;
+            font-size: 14px;
+            font-weight: 300;
+            line-height: 1.5em;
+            cursor: pointer;
+            transition: background 0.3s ease-in-out;
+        }
+        #speak-button:hover {
+            background: var(--primary-hover);
+        }
+        #speak-button:active {
+            background: var(--primary-active);
+        }
+        #speak-button-img {
+            width: 24px;
+        }
 
         .option-enabled {
             box-shadow: 0 0 12px rgb(119, 156, 46);