263 lines
11 KiB
Swift
263 lines
11 KiB
Swift
//
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// Copyright 2022 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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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 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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private var syncUpdateCancellable: AnyCancellable?
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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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self.elementCallService = elementCallService
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self.configuration = configuration
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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(messageHandler: Self.eventHandlerName,
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script: Self.eventHandlerInjectionScript,
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certificateValidator: appHooks.certificateValidatorHook))
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state.bindings.javaScriptMessageHandler = { [weak self] message in
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guard let self, let message = message as? String else { return }
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Task { await self.widgetDriver.handleMessage(message) }
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}
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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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setupCall()
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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 .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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}
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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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}
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// MARK: - Private
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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 clientProxy, let clientID, let elementCallBaseURL, let elementCallBaseURLOverride, let colorScheme):
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// Wait for room states to be up to date before starting the call and notifying others
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syncUpdateCancellable = clientProxy.actionsPublisher
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.filter(\.isSyncUpdate)
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.timeout(.seconds(5), scheduler: DispatchQueue.main)
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.first() // Timeout will make the publisher complete, use first to handle both branches in the same place
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.sink(receiveCompletion: { [weak self] _ in
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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 if case .success(let wellKnown) = await clientProxy.getElementWellKnown(), let wellKnownCall = wellKnown?.call {
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wellKnownCall.widgetURL
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} else {
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elementCallBaseURL
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}
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switch await widgetDriver.start(baseURL: baseURL, clientID: clientID, colorScheme: colorScheme) {
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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, roomDisplayName: roomProxy.roomTitle)
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_ = await roomProxy.sendCallNotificationIfNeeded()
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syncUpdateCancellable = nil
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}
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}, receiveValue: { _ in })
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}
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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(let controller):
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actionsSubject.send(.pictureInPictureStarted(controller))
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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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do {
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let data = try JSONEncoder().encode(message)
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let json = String(decoding: data, as: UTF8.self)
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await postJSONToWidget(json)
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} catch {
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MXLog.error("Failed encoding widget message with error: \(error)")
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}
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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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private static let eventHandlerName = "elementx"
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private static var eventHandlerInjectionScript: String {
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"""
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window.addEventListener(
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"message",
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(event) => {
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let message = {data: event.data, origin: event.origin}
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if (message.data.response && message.data.api == "toWidget"
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|| !message.data.response && message.data.api == "fromWidget") {
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window.webkit.messageHandlers.\(eventHandlerName).postMessage(JSON.stringify(message.data));
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}else{
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console.log("-- skipped event handling by the client because it is send from the client itself.");
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}
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},
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false,
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);
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"""
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}
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}
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