Login with QR UI components (#6790)

* Display QR button on login screen if HS supports

* Create start screen

* Add build flag

* Connect start screen to the login

* QR display screen

* Move `LabelledDividerView` into separate file

* Show display QR screen on button tap

* Add swift concurreny to CameraAccessManager

* Introduce `QRLoginServiceProtocol`

* Use new service in screens

* Introduce scan QR code screen

* Remove hardcoded service availability

* Remove unnecessary import

* Add confirmation screen

* Add loading screen

* Fix ZXingObjc targets

* Add failure screen

* Add strings

* Various UI tweaks, navigation according to the service state

* Fix tests

* Add string for invalid QR error

* Add QR login service mode

RiotSwiftUI/Modules/Authentication/Common/Service/MatrixSDK/AuthenticationRestClient.swift

@@ -48,6 +48,10 @@ protocol AuthenticationRestClient: AnyObject {
     func forgetPassword(for email: String, clientSecret: String, sendAttempt: UInt) async throws -> String
     func resetPassword(parameters: CheckResetPasswordParameters) async throws
     func resetPassword(parameters: [String: Any]) async throws
+
+    // MARK: Versions
+
+    func supportedMatrixVersions() async throws -> MXMatrixVersions
 }
 
 extension MXRestClient: AuthenticationRestClient { }

RiotSwiftUI/Modules/Authentication/Common/Service/MatrixSDK/AuthenticationService.swift

@@ -259,10 +259,14 @@ class AuthenticationService: NSObject {
         }
         
         let loginFlow = try await getLoginFlowResult(client: client)
+
+        let supportsQRLogin = try await QRLoginService(client: client,
+                                                       mode: .notAuthenticated).isServiceAvailable()
         
         let homeserver = AuthenticationState.Homeserver(address: loginFlow.homeserverAddress,
                                                         addressFromUser: homeserverAddress,
-                                                        preferredLoginMode: loginFlow.loginMode)
+                                                        preferredLoginMode: loginFlow.loginMode,
+                                                        supportsQRLogin: supportsQRLogin)
         return (client, homeserver)
     }
     

RiotSwiftUI/Modules/Authentication/Common/Service/MatrixSDK/AuthenticationState.swift

@@ -52,6 +52,9 @@ struct AuthenticationState {
         
         /// The preferred login mode for the server
         var preferredLoginMode: LoginMode = .unknown
+
+        /// Flag indicating whether the homeserver supports logging in via a QR code.
+        var supportsQRLogin = false
         
         /// The response returned when querying the homeserver for registration flows.
         var registrationFlow: RegistrationResult?
@@ -67,6 +70,7 @@ struct AuthenticationState {
             AuthenticationHomeserverViewData(address: displayableAddress,
                                              showLoginForm: preferredLoginMode.supportsPasswordFlow,
                                              showRegistrationForm: registrationFlow != nil && !needsRegistrationFallback,
+                                             showQRLogin: supportsQRLogin,
                                              ssoIdentityProviders: preferredLoginMode.ssoIdentityProviders ?? [])
         }