Merge pull request #6210 from vector-im/ismail/6176_auth_fallback

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

@@ -137,7 +137,7 @@ class AuthenticationService: NSObject {
     func reset() {
         loginWizard = nil
         registrationWizard = nil
-        
+
         // The previously used homeserver is re-used as `startFlow` will be called again a replace it anyway.
         let address = state.homeserver.addressFromUser ?? state.homeserver.address
         self.state = AuthenticationState(flow: .login, homeserverAddress: address)

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

@@ -63,8 +63,26 @@ struct AuthenticationState {
             AuthenticationHomeserverViewData(address: displayableAddress,
                                              isMatrixDotOrg: isMatrixDotOrg,
                                              showLoginForm: preferredLoginMode.supportsPasswordFlow,
-                                             showRegistrationForm: registrationFlow != nil,
+                                             showRegistrationForm: registrationFlow != nil && !needsRegistrationFallback,
                                              ssoIdentityProviders: preferredLoginMode.ssoIdentityProviders ?? [])
         }
+
+        /// Needs authentication fallback for login
+        var needsLoginFallback: Bool {
+            return preferredLoginMode.isUnsupported
+        }
+
+        /// Needs authentication fallback for registration
+        var needsRegistrationFallback: Bool {
+            guard let flow = registrationFlow else {
+                return false
+            }
+            switch flow {
+            case .flowResponse(let result):
+                return result.needsFallback
+            default:
+                return false
+            }
+        }
     }
 }

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

@@ -75,6 +75,15 @@ enum LoginMode {
             return false
         }
     }
+
+    var isUnsupported: Bool {
+        switch self {
+        case .unsupported:
+            return true
+        default:
+            return false
+        }
+    }
 }
 
 /// Data obtained when calling `LoginWizard.resetPassword` that will be used