1.2.0: voice input in the web chat

- RECORD_AUDIO permission granted to the WebView (onPermissionRequest)
- the chat's single composer button becomes a microphone when the input is
  empty and voice input is available; recording stops into server-side ASR
  (/api/transcribe) when the browser has no Web Speech API
- version 1.2.0

app/build.gradle.kts

@@ -22,8 +22,8 @@ android {
         applicationId = "dev.n1ko.nikogpt"
         minSdk = 29 // Android 10
         targetSdk = 35
-        versionCode = 5
-        versionName = "1.1.0"
+        versionCode = 6
+        versionName = "1.2.0"
     }
 
     signingConfigs {

app/src/main/AndroidManifest.xml

@@ -2,6 +2,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
     <uses-permission android:name="android.permission.INTERNET" />
+    <!-- Voice input in the web chat (MediaRecorder + server-side recognition). -->
+    <uses-permission android:name="android.permission.RECORD_AUDIO" />
 
     <application
         android:allowBackup="false"

app/src/main/java/dev/n1ko/nikogpt/MainActivity.kt

@@ -1,11 +1,13 @@
 package dev.n1ko.nikogpt
 
+import android.Manifest
 import android.annotation.SuppressLint
 import android.app.AlertDialog
 import android.app.DownloadManager
 import android.content.ActivityNotFoundException
 import android.content.Context
 import android.content.Intent
+import android.content.pm.PackageManager
 import android.net.Uri
 import android.net.http.SslError
 import android.os.Bundle
@@ -14,6 +16,7 @@ import android.view.View
 import android.webkit.CookieManager
 import android.webkit.DownloadListener
 import android.webkit.JavascriptInterface
+import android.webkit.PermissionRequest
 import android.webkit.SslErrorHandler
 import android.webkit.URLUtil
 import android.webkit.ValueCallback
@@ -32,6 +35,7 @@ import androidx.activity.OnBackPressedCallback
 import androidx.activity.result.ActivityResultLauncher
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.appcompat.app.AppCompatActivity
+import androidx.core.content.ContextCompat
 import androidx.core.content.FileProvider
 import androidx.core.view.ViewCompat
 import androidx.core.view.WindowCompat
@@ -103,6 +107,16 @@ class MainActivity : AppCompatActivity() {
             }
         }
 
+    // Runtime microphone permission, bridged to the WebView.
+    private var pendingWebPermission: PermissionRequest? = null
+    private val audioPermission: ActivityResultLauncher<String> =
+        registerForActivityResult(ActivityResultContracts.RequestPermission()) { granted ->
+            val request = pendingWebPermission
+            pendingWebPermission = null
+            if (request == null) return@registerForActivityResult
+            if (granted) request.grant(request.resources) else request.deny()
+        }
+
     // Camera capture for the attach button.
     private val takePicture: ActivityResultLauncher<Uri> =
         registerForActivityResult(ActivityResultContracts.TakePicture()) { ok ->
@@ -195,6 +209,22 @@ class MainActivity : AppCompatActivity() {
         }
 
         webView.webChromeClient = object : WebChromeClient() {
+            override fun onPermissionRequest(request: PermissionRequest) {
+                if (request.resources.none { it == PermissionRequest.RESOURCE_AUDIO_CAPTURE }) {
+                    request.deny()
+                    return
+                }
+                if (ContextCompat.checkSelfPermission(
+                        this@MainActivity, Manifest.permission.RECORD_AUDIO,
+                    ) == PackageManager.PERMISSION_GRANTED
+                ) {
+                    request.grant(request.resources)
+                    return
+                }
+                pendingWebPermission = request
+                audioPermission.launch(Manifest.permission.RECORD_AUDIO)
+            }
+
             override fun onProgressChanged(view: WebView, newProgress: Int) {
                 progress.visibility = if (newProgress in 1..99) View.VISIBLE else View.GONE
                 progress.progress = newProgress