Integrate Element Call with widget API (#1581)

* Integrate Element Call with widget API.

- Add `appconfig` module and extract constants that can be overridden in forks there.
- Add an Element Call feature flag, disabled by default.
- Refactor the whole `ElementCallActivity`, move most logic out of it.
- Integrate with the Rust Widget Driver API (note the Rust SDK version used in this PR lacks some needed changes to make the calls actually work).
- Handle calls differently based on `CallType`.
- Add UI to create/join a call.

---------

Co-authored-by: ElementBot <benoitm+elementbot@element.io>

libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/FakeMatrixClient.kt

@@ -208,8 +208,12 @@ class FakeMatrixClient(
         findDmResult = result
     }
 
-    fun givenGetRoomResult(roomId: RoomId, result: MatrixRoom) {
-        getRoomResults[roomId] = result
+    fun givenGetRoomResult(roomId: RoomId, result: MatrixRoom?) {
+        if (result == null) {
+            getRoomResults.remove(roomId)
+        } else {
+            getRoomResults[roomId] = result
+        }
     }
 
     fun givenSearchUsersResult(searchTerm: String, result: Result<MatrixSearchUserResults>) {

libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/FakeMatrixClientProvider.kt

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2023 New Vector Ltd
+ *
+ * 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.
+ */
+
+package io.element.android.libraries.matrix.test
+
+import io.element.android.libraries.matrix.api.MatrixClient
+import io.element.android.libraries.matrix.api.MatrixClientProvider
+import io.element.android.libraries.matrix.api.core.SessionId
+
+class FakeMatrixClientProvider(
+    private val getClient: (SessionId) -> Result<MatrixClient> = { Result.success(FakeMatrixClient()) }
+) : MatrixClientProvider {
+    override suspend fun getOrRestore(sessionId: SessionId): Result<MatrixClient> = getClient(sessionId)
+}

libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/room/FakeMatrixRoom.kt

@@ -36,11 +36,14 @@ import io.element.android.libraries.matrix.api.room.MessageEventType
 import io.element.android.libraries.matrix.api.room.StateEventType
 import io.element.android.libraries.matrix.api.room.location.AssetType
 import io.element.android.libraries.matrix.api.timeline.MatrixTimeline
+import io.element.android.libraries.matrix.api.widget.MatrixWidgetDriver
+import io.element.android.libraries.matrix.api.widget.MatrixWidgetSettings
 import io.element.android.libraries.matrix.test.A_ROOM_ID
 import io.element.android.libraries.matrix.test.A_SESSION_ID
 import io.element.android.libraries.matrix.test.media.FakeMediaUploadHandler
 import io.element.android.libraries.matrix.test.notificationsettings.FakeNotificationSettingsService
 import io.element.android.libraries.matrix.test.timeline.FakeMatrixTimeline
+import io.element.android.libraries.matrix.test.widget.FakeWidgetDriver
 import io.element.android.tests.testutils.simulateLongTask
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -92,6 +95,8 @@ class FakeMatrixRoom(
     private var sendPollResponseResult = Result.success(Unit)
     private var endPollResult = Result.success(Unit)
     private var progressCallbackValues = emptyList<Pair<Long, Long>>()
+    private var generateWidgetWebViewUrlResult = Result.success("https://call.element.io")
+    private var getWidgetDriverResult: Result<MatrixWidgetDriver> = Result.success(FakeWidgetDriver())
     val editMessageCalls = mutableListOf<Pair<String, String?>>()
 
     var sendMediaCount = 0
@@ -368,6 +373,15 @@ class FakeMatrixRoom(
         progressCallback: ProgressCallback?
     ): Result<MediaUploadHandler> = fakeSendMedia(progressCallback)
 
+    override suspend fun generateWidgetWebViewUrl(
+        widgetSettings: MatrixWidgetSettings,
+        clientId: String,
+        languageTag: String?,
+        theme: String?,
+    ): Result<String> = generateWidgetWebViewUrlResult
+
+    override fun getWidgetDriver(widgetSettings: MatrixWidgetSettings): Result<MatrixWidgetDriver> = getWidgetDriverResult
+
     fun givenLeaveRoomError(throwable: Throwable?) {
         this.leaveRoomError = throwable
     }
@@ -475,6 +489,14 @@ class FakeMatrixRoom(
     fun givenProgressCallbackValues(values: List<Pair<Long, Long>>) {
         progressCallbackValues = values
     }
+
+    fun givenGenerateWidgetWebViewUrlResult(result: Result<String>) {
+        generateWidgetWebViewUrlResult = result
+    }
+
+    fun givenGetWidgetDriverResult(result: Result<MatrixWidgetDriver>) {
+        getWidgetDriverResult = result
+    }
 }
 
 data class SendLocationInvocation(

libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/widget/FakeCallWidgetSettingsProvider.kt

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2023 New Vector Ltd
+ *
+ * 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.
+ */
+
+package io.element.android.libraries.matrix.test.widget
+
+import io.element.android.libraries.matrix.api.widget.CallWidgetSettingsProvider
+import io.element.android.libraries.matrix.api.widget.MatrixWidgetSettings
+
+class FakeCallWidgetSettingsProvider(
+    private val provideFn: (String, String) -> MatrixWidgetSettings = { _, _ -> MatrixWidgetSettings("id", true, "url") }
+) : CallWidgetSettingsProvider {
+
+    val providedBaseUrls = mutableListOf<String>()
+
+    override fun provide(baseUrl: String, widgetId: String): MatrixWidgetSettings {
+        providedBaseUrls += baseUrl
+        return provideFn(baseUrl, widgetId)
+    }
+}

libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/widget/FakeWidgetDriver.kt

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2023 New Vector Ltd
+ *
+ * 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.
+ */
+
+package io.element.android.libraries.matrix.test.widget
+
+import io.element.android.libraries.matrix.api.widget.MatrixWidgetDriver
+import kotlinx.coroutines.flow.MutableSharedFlow
+import java.util.UUID
+
+class FakeWidgetDriver(
+    override val id: String = UUID.randomUUID().toString(),
+) : MatrixWidgetDriver {
+
+    private val _sentMessages = mutableListOf<String>()
+    val sentMessages: List<String> = _sentMessages
+
+    var runCalledCount = 0
+        private set
+    var closeCalledCount = 0
+        private set
+
+    override val incomingMessages = MutableSharedFlow<String>(extraBufferCapacity = 1)
+
+    override suspend fun run() {
+        runCalledCount++
+    }
+
+    override suspend fun send(message: String) {
+        _sentMessages.add(message)
+    }
+
+    override fun close() {
+        closeCalledCount++
+    }
+
+    fun givenIncomingMessage(message: String) {
+        incomingMessages.tryEmit(message)
+    }
+}