312 lines
13 KiB
Swift
312 lines
13 KiB
Swift
//
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// Copyright 2022-2024 New Vector Ltd.
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//
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// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
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// Please see LICENSE files in the repository root for full details.
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//
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import AVKit
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import CallKit
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import Combine
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import SwiftUI
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typealias CallScreenViewModelType = StateStoreViewModel<CallScreenViewState, CallScreenViewAction>
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class CallScreenViewModel: CallScreenViewModelType, CallScreenViewModelProtocol {
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private let elementCallService: ElementCallServiceProtocol
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private let configuration: ElementCallConfiguration
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private let isPictureInPictureAllowed: Bool
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private let appSettings: AppSettings
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private let analyticsService: AnalyticsService
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private let widgetDriver: ElementCallWidgetDriverProtocol
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private let actionsSubject: PassthroughSubject<CallScreenViewModelAction, Never> = .init()
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var actions: AnyPublisher<CallScreenViewModelAction, Never> {
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actionsSubject.eraseToAnyPublisher()
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}
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@CancellableTask
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private var timeoutTask: Task<Void, Never>?
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/// Designated initialiser
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/// - Parameters:
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/// - elementCallService: service responsible for setting up CallKit
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/// - roomProxy: The room in which the call should be created
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/// - callBaseURL: Which Element Call instance should be used
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/// - clientID: Something to identify the current client on the Element Call side
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init(elementCallService: ElementCallServiceProtocol,
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configuration: ElementCallConfiguration,
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allowPictureInPicture: Bool,
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appHooks: AppHooks,
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appSettings: AppSettings,
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analyticsService: AnalyticsService) {
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self.elementCallService = elementCallService
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self.configuration = configuration
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self.appSettings = appSettings
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self.analyticsService = analyticsService
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isPictureInPictureAllowed = allowPictureInPicture
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switch configuration.kind {
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case .genericCallLink(let url):
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widgetDriver = GenericCallLinkWidgetDriver(url: url)
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case .roomCall(let roomProxy, let clientProxy, _, _, _, _, _):
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guard let deviceID = clientProxy.deviceID else { fatalError("Missing device ID for the call.") }
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widgetDriver = roomProxy.elementCallWidgetDriver(deviceID: deviceID)
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}
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super.init(initialViewState: CallScreenViewState(script: CallScreenJavaScriptMessageName.allCasesInjectionScript,
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certificateValidator: appHooks.certificateValidatorHook))
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elementCallService.actions
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.receive(on: DispatchQueue.main)
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.sink { [weak self] action in
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guard let self else { return }
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switch action {
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case let .setAudioEnabled(enabled, roomID):
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guard roomID == configuration.callRoomID else {
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MXLog.error("Received mute request for a different room: \(roomID) != \(configuration.callRoomID)")
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return
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}
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Task {
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await self.setAudioEnabled(enabled)
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}
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default:
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break
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}
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}
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.store(in: &cancellables)
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widgetDriver.messagePublisher
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.receive(on: DispatchQueue.main)
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.sink { [weak self] receivedMessage in
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guard let self else { return }
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Task {
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await self.postJSONToWidget(receivedMessage)
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}
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}
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.store(in: &cancellables)
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widgetDriver.actions
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.receive(on: DispatchQueue.main)
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.sink { [weak self] action in
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guard let self else { return }
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switch action {
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case .callEnded:
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actionsSubject.send(.dismiss)
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case .mediaStateChanged(let audioEnabled, _):
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elementCallService.setAudioEnabled(audioEnabled, roomID: configuration.callRoomID)
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}
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}
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.store(in: &cancellables)
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NotificationCenter.default
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.publisher(for: AVAudioSession.routeChangeNotification)
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.sink { [weak self] _ in
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Task { await self?.updateOutputsListOnWeb() }
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}
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.store(in: &cancellables)
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setupCall()
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timeoutTask = Task { [weak self] in
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try? await Task.sleep(for: .seconds(10))
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guard !Task.isCancelled, let self else { return }
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MXLog.error("Failed to join Element Call: Timeout")
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state.bindings.alertInfo = .init(id: UUID(),
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title: L10n.commonError,
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message: L10n.errorUnknown,
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primaryButton: .init(title: L10n.actionDismiss) { [weak self] in self?.actionsSubject.send(.dismiss) })
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timeoutTask = nil
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}
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}
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override func process(viewAction: CallScreenViewAction) {
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switch viewAction {
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case .urlChanged(let url):
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guard let url else { return }
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MXLog.info("URL changed to: \(url)")
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case .pictureInPictureIsAvailable(let controller):
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actionsSubject.send(.pictureInPictureIsAvailable(controller))
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case .navigateBack:
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Task { await handleBackwardsNavigation() }
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case .pictureInPictureWillStop:
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actionsSubject.send(.pictureInPictureStopped)
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case .endCall:
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actionsSubject.send(.dismiss)
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case .mediaCapturePermissionGranted:
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Task { await updateOutputsListOnWeb() }
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case .outputDeviceSelected(deviceID: let deviceID):
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handleOutputDeviceSelected(deviceID: deviceID)
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case .widgetAction(let message):
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Task { await handleWidgetAction(message: message) }
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}
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}
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func stop() {
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Task {
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await hangup()
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}
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elementCallService.tearDownCallSession()
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UIDevice.current.isProximityMonitoringEnabled = false
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}
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// MARK: - Private
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private func handleWidgetAction(message: String) async {
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if timeoutTask != nil,
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let decodedMessage = try? DecodedWidgetMessage.decode(message: message),
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decodedMessage.hasJoined {
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// This means that the call room was joined succesfully, we can stop the timeout task
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timeoutTask = nil
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}
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await widgetDriver.handleMessage(message)
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}
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private func setupCall() {
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switch configuration.kind {
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case .genericCallLink(let url):
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state.url = url
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// We need widget messaging to work before enabling CallKit, otherwise mute, hangup etc do nothing.
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case .roomCall(let roomProxy, _, let clientID, let elementCallBaseURL, let elementCallBaseURLOverride, let colorScheme, let notifyOtherParticipants):
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Task { [weak self] in
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guard let self else { return }
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let baseURL = if let elementCallBaseURLOverride {
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elementCallBaseURLOverride
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} else {
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elementCallBaseURL
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}
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// We only set the analytics configuration if analytics are enabled
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let analyticsConfiguration = analyticsService.isEnabled ? ElementCallAnalyticsConfiguration(posthogAPIHost: appSettings.elementCallPosthogAPIHost,
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posthogAPIKey: appSettings.elementCallPosthogAPIKey,
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sentryDSN: appSettings.elementCallPosthogSentryDSN) : nil
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switch await widgetDriver.start(baseURL: baseURL,
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clientID: clientID,
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colorScheme: colorScheme,
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rageshakeURL: appSettings.bugReportRageshakeURL?.absoluteString,
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analyticsConfiguration: analyticsConfiguration) {
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case .success(let url):
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state.url = url
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case .failure(let error):
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MXLog.error("Failed starting ElementCall Widget Driver with error: \(error)")
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state.bindings.alertInfo = .init(id: UUID(),
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title: L10n.errorUnknown,
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primaryButton: .init(title: L10n.actionOk) {
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self.actionsSubject.send(.dismiss)
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})
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return
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}
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await elementCallService.setupCallSession(roomID: roomProxy.id,
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roomDisplayName: roomProxy.infoPublisher.value.displayName ?? roomProxy.id)
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if notifyOtherParticipants {
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_ = await roomProxy.sendCallNotificationIfNeeded()
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}
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}
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}
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}
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// This should always match the web app value
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private static let earpieceID = "earpiece-id"
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private func handleOutputDeviceSelected(deviceID: String) {
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let isEarpiece = deviceID == Self.earpieceID
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MXLog.info("[handleOutputDeviceSelected] is earpiece: \(isEarpiece)")
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UIDevice.current.isProximityMonitoringEnabled = isEarpiece
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}
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private func handleBackwardsNavigation() async {
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guard state.url != nil,
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isPictureInPictureAllowed,
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let requestPictureInPictureHandler = state.bindings.requestPictureInPictureHandler else {
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actionsSubject.send(.dismiss)
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return
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}
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switch await requestPictureInPictureHandler() {
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case .success:
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actionsSubject.send(.pictureInPictureStarted)
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case .failure:
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actionsSubject.send(.dismiss)
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}
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}
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private func setAudioEnabled(_ enabled: Bool) async {
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let message = ElementCallWidgetMessage(direction: .toWidget,
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action: .mediaState,
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data: .init(audioEnabled: enabled),
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widgetId: widgetDriver.widgetID)
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await postMessageToWidget(message)
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}
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func hangup() async {
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let message = ElementCallWidgetMessage(direction: .fromWidget,
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action: .hangup,
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widgetId: widgetDriver.widgetID)
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await postMessageToWidget(message)
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}
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private func postMessageToWidget(_ message: ElementCallWidgetMessage) async {
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let data: Data
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do {
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data = try JSONEncoder().encode(message)
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} catch {
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MXLog.error("Failed encoding widget message with error: \(error)")
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return
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}
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guard let json = String(data: data, encoding: .utf8) else {
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MXLog.error("Invalid data for widget message")
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return
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}
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await postJSONToWidget(json)
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}
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private func postJSONToWidget(_ json: String) async {
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do {
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let message = "postMessage(\(json), '*')"
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let result = try await state.bindings.javaScriptEvaluator?(message)
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MXLog.debug("Evaluated javascript: \(json) with result: \(String(describing: result))")
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} catch {
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MXLog.error("Received javascript evaluation error: \(error)")
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}
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}
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/// This function updates the list of available audio outputs on the web side
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/// however since we actually handle switching the audio output through the OS,
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/// this is only used to inform the webview when the speaker is selected,
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/// so that the option to use the earpiece can be displayed.
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private func updateOutputsListOnWeb() async {
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guard let currentOutput = AVAudioSession.sharedInstance().currentRoute.outputs.first else {
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return
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}
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let deviceList = if currentOutput.portType == .builtInSpeaker {
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// This allows the webview to display the earpiece option
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"{id: '\(currentOutput.uid)', name: '\(currentOutput.portName)', forEarpiece: true, isSpeaker: true}"
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} else {
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// Doesn't matter because the switch is handled through the OS
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"{id: 'dummy', name: 'dummy'}"
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}
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let javaScript = "window.controls.setAvailableOutputDevices([\(deviceList)])"
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do {
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let result = try await state.bindings.javaScriptEvaluator?(javaScript)
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MXLog.debug("Evaluated with result: \(String(describing: result))")
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} catch {
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MXLog.error("Received javascript evaluation error: \(error)")
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}
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}
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}
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