127 lines
4.6 KiB
Swift
127 lines
4.6 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 SwiftUI
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struct ServerSelectionCoordinatorParameters {
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/// The service used to authenticate the user.
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let authenticationService: AuthenticationServiceProxyProtocol
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/// Whether the screen is presented modally or within a navigation stack.
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let hasModalPresentation: Bool
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}
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enum ServerSelectionCoordinatorAction {
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case updated
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case dismiss
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}
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final class ServerSelectionCoordinator: Coordinator, Presentable {
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// MARK: - Properties
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// MARK: Private
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private let parameters: ServerSelectionCoordinatorParameters
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private let serverSelectionHostingController: UIViewController
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private var serverSelectionViewModel: ServerSelectionViewModelProtocol
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private var authenticationService: AuthenticationServiceProxyProtocol { parameters.authenticationService }
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private var indicatorPresenter: UserIndicatorTypePresenterProtocol
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private var loadingIndicator: UserIndicator?
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// MARK: Public
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// Must be used only internally
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var childCoordinators: [Coordinator] = []
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var callback: (@MainActor (ServerSelectionCoordinatorAction) -> Void)?
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// MARK: - Setup
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init(parameters: ServerSelectionCoordinatorParameters) {
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self.parameters = parameters
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let viewModel = ServerSelectionViewModel(homeserverAddress: parameters.authenticationService.homeserver.address,
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hasModalPresentation: parameters.hasModalPresentation)
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let view = ServerSelectionScreen(context: viewModel.context)
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serverSelectionViewModel = viewModel
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serverSelectionHostingController = UIHostingController(rootView: view)
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indicatorPresenter = UserIndicatorTypePresenter(presentingViewController: serverSelectionHostingController)
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}
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// MARK: - Public
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func start() {
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MXLog.debug("[ServerSelectionCoordinator] did start.")
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serverSelectionViewModel.callback = { [weak self] action in
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guard let self = self else { return }
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MXLog.debug("[ServerSelectionCoordinator] ServerSelectionViewModel did callback with action: \(action).")
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switch action {
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case .confirm(let homeserverAddress):
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self.useHomeserver(homeserverAddress)
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case .dismiss:
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self.callback?(.dismiss)
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}
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}
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}
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func toPresentable() -> UIViewController {
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serverSelectionHostingController
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}
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// MARK: - Private
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/// Show an activity indicator whilst loading.
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/// - Parameters:
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/// - label: The label to show on the indicator.
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/// - isInteractionBlocking: Whether the indicator should block any user interaction.
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private func startLoading(label: String = ElementL10n.loading, isInteractionBlocking: Bool = true) {
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loadingIndicator = indicatorPresenter.present(.loading(label: label, isInteractionBlocking: isInteractionBlocking))
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}
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/// Hide the currently displayed activity indicator.
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private func stopLoading() {
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loadingIndicator = nil
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}
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/// Updates the login flow using the supplied homeserver address, or shows an error when this isn't possible.
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private func useHomeserver(_ homeserverAddress: String) {
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startLoading()
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Task {
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switch await authenticationService.configure(for: homeserverAddress) {
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case .success:
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callback?(.updated)
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stopLoading()
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case .failure(let error):
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stopLoading()
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handleError(error)
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}
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}
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}
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/// Processes an error to either update the flow or display it to the user.
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private func handleError(_ error: AuthenticationServiceError) {
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switch error {
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case .invalidServer, .invalidHomeserverAddress:
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serverSelectionViewModel.displayError(.footerMessage(ElementL10n.loginErrorHomeserverNotFound))
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default:
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serverSelectionViewModel.displayError(.footerMessage(ElementL10n.unknownError))
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}
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}
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}
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