Automatic discovery of the sliding sync proxy. (#535)

* Automatic discovery of the sliding sync proxy.

* Handle homeserver detection from a MXID.

* Update sliding sync info link, SDK and bump patch.

Add a migration on the new version. The change in restoration token format requires the user to sign in again, but this will fail with the existing device ID.

ElementX/Sources/Screens/Authentication/LoginScreen/LoginCoordinator.swift

@@ -124,6 +124,8 @@ final class LoginCoordinator: CoordinatorProtocol {
             viewModel.displayError(.alert(ElementL10n.authInvalidLoginParam))
         case .accountDeactivated:
             viewModel.displayError(.alert(ElementL10n.authInvalidLoginDeactivatedAccount))
+        case .slidingSyncNotAvailable:
+            viewModel.displayError(.slidingSyncAlert)
         default:
             viewModel.displayError(.alert(ElementL10n.unknownError))
         }
@@ -197,10 +199,8 @@ final class LoginCoordinator: CoordinatorProtocol {
     
     /// Presents the server selection screen as a modal.
     private func presentServerSelectionScreen() {
-        let userNotificationController = UserNotificationController(rootCoordinator: navigationStackCoordinator)
-        
         let parameters = ServerSelectionCoordinatorParameters(authenticationService: authenticationService,
-                                                              userNotificationController: userNotificationController,
+                                                              userNotificationController: ServiceLocator.shared.userNotificationController,
                                                               isModallyPresented: false)
         
         let coordinator = ServerSelectionCoordinator(parameters: parameters)

ElementX/Sources/Screens/Authentication/LoginScreen/LoginModels.swift

@@ -94,6 +94,8 @@ enum LoginErrorType: Hashable {
     case alert(String)
     /// Looking up the homeserver from the username failed.
     case invalidHomeserver
+    /// An alert that allows the user to learn about sliding sync.
+    case slidingSyncAlert
     /// The response from the homeserver was unexpected.
     case unknown
 }

ElementX/Sources/Screens/Authentication/LoginScreen/LoginViewModel.swift

@@ -62,6 +62,16 @@ class LoginViewModel: LoginViewModelType, LoginViewModelProtocol {
             state.bindings.alertInfo = AlertInfo(id: type,
                                                  title: ElementL10n.dialogTitleError,
                                                  message: ElementL10n.loginSigninMatrixIdErrorInvalidMatrixId)
+        case .slidingSyncAlert:
+            let openURL = { UIApplication.shared.open(ServiceLocator.shared.settings.slidingSyncLearnMoreURL) }
+            state.bindings.alertInfo = AlertInfo(id: .slidingSyncAlert,
+                                                 title: ElementL10n.serverSelectionSlidingSyncAlertTitle,
+                                                 message: ElementL10n.serverSelectionSlidingSyncAlertMessage,
+                                                 primaryButton: .init(title: ElementL10n.actionLearnMore, role: .cancel, action: openURL),
+                                                 secondaryButton: .init(title: ElementL10n.actionCancel, action: nil))
+            
+            // Clear out the invalid username to avoid an attempted login to matrix.org
+            state.bindings.username = ""
         case .unknown:
             state.bindings.alertInfo = AlertInfo(id: type)
         }

ElementX/Sources/Screens/Authentication/LoginScreen/View/LoginScreen.swift

@@ -64,7 +64,6 @@ struct LoginScreen: View {
         LoginServerInfoSection(address: context.viewState.homeserver.address) {
             context.send(viewAction: .selectServer)
         }
-        .disabled(true) // The button is disabled for this demo.
     }
     
     /// The form with text fields for username and password, along with a submit button.
@@ -96,14 +95,6 @@ struct LoginScreen: View {
                 .onSubmit(submit)
                 .accessibilityIdentifier("passwordTextField")
             
-            // uncomment this piece of code once forgot password will be available
-//            Button { context.send(viewAction: .forgotPassword) } label: {
-//                Text(ElementL10n.ftueAuthForgotPassword)
-//                    .font(.element.body)
-//            }
-//            .frame(maxWidth: .infinity, alignment: .trailing)
-//            .padding(.bottom, 8)
-            
             Spacer().frame(height: 32)
 
             Button(action: submit) {

ElementX/Sources/Screens/Authentication/LoginScreen/View/LoginServerInfoSection.swift

@@ -48,7 +48,6 @@ struct LoginServerInfoSection: View {
                     Image(systemName: "chevron.right")
                         .foregroundColor(.element.tertiaryContent)
                         .padding(.trailing, 16)
-                        .hidden() // The button is disabled for this demo.
                 }
                 .background(RoundedRectangle(cornerRadius: 14).fill(Color.element.system))
             }

ElementX/Sources/Screens/Authentication/ServerSelection/ServerSelectionCoordinator.swift

@@ -102,6 +102,8 @@ final class ServerSelectionCoordinator: CoordinatorProtocol {
         switch error {
         case .invalidServer, .invalidHomeserverAddress:
             viewModel.displayError(.footerMessage(ElementL10n.loginErrorHomeserverNotFound))
+        case .slidingSyncNotAvailable:
+            viewModel.displayError(.slidingSyncAlert)
         default:
             viewModel.displayError(.footerMessage(ElementL10n.unknownError))
         }

ElementX/Sources/Screens/Authentication/ServerSelection/ServerSelectionModels.swift

@@ -71,4 +71,6 @@ enum ServerSelectionViewAction {
 enum ServerSelectionErrorType: Hashable {
     /// An error message to be shown in the text field footer.
     case footerMessage(String)
+    /// An alert that allows the user to learn about sliding sync.
+    case slidingSyncAlert
 }

ElementX/Sources/Screens/Authentication/ServerSelection/ServerSelectionViewModel.swift

@@ -45,6 +45,13 @@ class ServerSelectionViewModel: ServerSelectionViewModelType, ServerSelectionVie
             withElementAnimation {
                 state.footerErrorMessage = message
             }
+        case .slidingSyncAlert:
+            let openURL = { UIApplication.shared.open(ServiceLocator.shared.settings.slidingSyncLearnMoreURL) }
+            state.bindings.alertInfo = AlertInfo(id: .slidingSyncAlert,
+                                                 title: ElementL10n.serverSelectionSlidingSyncAlertTitle,
+                                                 message: ElementL10n.serverSelectionSlidingSyncAlertMessage,
+                                                 primaryButton: .init(title: ElementL10n.actionLearnMore, role: .cancel, action: openURL),
+                                                 secondaryButton: .init(title: ElementL10n.actionCancel, action: nil))
         }
     }