EC Timeout if it doesn't respond after 30 seconds (#4237)

* basic implementation

* using a decodable struct to interpret the widget message

* small code refactor/improvement

ElementX/Sources/Mocks/Generated/GeneratedMocks.swift

@@ -6357,6 +6357,7 @@ class ElementCallWidgetDriverMock: ElementCallWidgetDriverProtocol, @unchecked S
     }
     var handleMessageClosure: ((String) async -> Result<Bool, ElementCallWidgetDriverError>)?
 
+    @discardableResult
     func handleMessage(_ message: String) async -> Result<Bool, ElementCallWidgetDriverError> {
         handleMessageCallsCount += 1
         handleMessageReceivedMessage = message

ElementX/Sources/Screens/CallScreen/CallScreenModels.swift

@@ -94,3 +94,23 @@ enum CallScreenJavaScriptMessageName: String, CaseIterable {
         allCases.map(\.postMessageScript).joined(separator: "\n")
     }
 }
+
+struct DecodedWidgetMessage: Decodable {
+    private static let decoder = JSONDecoder()
+    private static let joinAction = "io.element.join"
+    private static let fromWidget = "fromWidget"
+    
+    let action: String?
+    let api: String?
+    
+    static func decode(message: String) throws -> DecodedWidgetMessage? {
+        guard let data = message.data(using: .utf8) else {
+            return nil
+        }
+        return try decoder.decode(DecodedWidgetMessage.self, from: data)
+    }
+    
+    var hasJoined: Bool {
+        action == Self.joinAction && api == Self.fromWidget
+    }
+}

ElementX/Sources/Screens/CallScreen/CallScreenViewModel.swift

@@ -26,6 +26,9 @@ class CallScreenViewModel: CallScreenViewModelType, CallScreenViewModelProtocol
         actionsSubject.eraseToAnyPublisher()
     }
     
+    @CancellableTask
+    private var timeoutTask: Task<Void, Never>?
+        
     /// Designated initialiser
     /// - Parameters:
     ///   - elementCallService: service responsible for setting up CallKit
@@ -109,6 +112,17 @@ class CallScreenViewModel: CallScreenViewModelType, CallScreenViewModelProtocol
             .store(in: &cancellables)
         
         setupCall()
+        
+        timeoutTask = Task { [weak self] in
+            try? await Task.sleep(for: .seconds(30))
+            guard !Task.isCancelled, let self else { return }
+            MXLog.error("Failed to join Element Call: Timeout")
+            state.bindings.alertInfo = .init(id: UUID(),
+                                             title: L10n.commonError,
+                                             message: L10n.errorUnknown,
+                                             primaryButton: .init(title: L10n.actionDismiss) { [weak self] in self?.actionsSubject.send(.dismiss) })
+            timeoutTask = nil
+        }
     }
     
     override func process(viewAction: CallScreenViewAction) {
@@ -129,7 +143,7 @@ class CallScreenViewModel: CallScreenViewModelType, CallScreenViewModelProtocol
         case .outputDeviceSelected(deviceID: let deviceID):
             handleOutputDeviceSelected(deviceID: deviceID)
         case .widgetAction(let message):
-            Task { await widgetDriver.handleMessage(message) }
+            Task { await handleWidgetAction(message: message) }
         }
     }
     
@@ -143,6 +157,16 @@ class CallScreenViewModel: CallScreenViewModelType, CallScreenViewModelProtocol
     }
     
     // MARK: - Private
+
+    private func handleWidgetAction(message: String) async {
+        if timeoutTask != nil,
+           let decodedMessage = try? DecodedWidgetMessage.decode(message: message),
+           decodedMessage.hasJoined {
+            // This means that the call room was joined succesfully, we can stop the timeout task
+            timeoutTask = nil
+        }
+        await widgetDriver.handleMessage(message)
+    }
     
     private func setupCall() {
         switch configuration.kind {

ElementX/Sources/Services/ElementCall/ElementCallWidgetDriver.swift

@@ -163,6 +163,7 @@ class ElementCallWidgetDriver: WidgetCapabilitiesProvider, ElementCallWidgetDriv
         return .success(url)
     }
     
+    @discardableResult
     func handleMessage(_ message: String) async -> Result<Bool, ElementCallWidgetDriverError> {
         guard let widgetDriver else {
             return .failure(.driverNotSetup)

ElementX/Sources/Services/ElementCall/ElementCallWidgetDriverProtocol.swift

@@ -36,6 +36,7 @@ protocol ElementCallWidgetDriverProtocol {
                analyticsConfiguration: ElementCallAnalyticsConfiguration?) async -> Result<URL, ElementCallWidgetDriverError>
     
     /// Passes a message from the Widget to the SDK to handle, returning a Bool that represents whether or not the widget driver is still running.
+    @discardableResult
     func handleMessage(_ message: String) async -> Result<Bool, ElementCallWidgetDriverError>
 }