Show correct error screen scanning a QR that is valid but unsupported

ElementX/Sources/Services/Authentication/AuthenticationService.swift

@@ -179,20 +179,18 @@
             return progressSubject.asCurrentValuePublisher()
         }
 
-        // At some stage the SDK will have a `qrCodeData.intent` which we should check before continuing here.
-        // Note the equivalent check will also happen for linking a device by QR in the LinkNewDeviceService.
+        // n.b. We rely on the SDK checking that the intent of the QR is suitable for us to login with.
 
-        guard let scannedServerName = qrData.serverName() else {
+        // Future versions of the QR should always give us the baseUrl
+        guard let scannedServerNameOrBaseUrl = qrData.baseUrl() ?? qrData.serverName() else {
+            // With the older version of QR we treat the presence of serverName as meaning that the other device
+            // is not signed in.
             MXLog.error("The QR code is from a device that is not yet signed in.")
             progressSubject.send(completion: .failure(.qrCodeError(.deviceNotSignedIn)))
             return progressSubject.asCurrentValuePublisher()
         }
-
-        if !appSettings.allowOtherAccountProviders, !appSettings.accountProviders.contains(scannedServerName) {
-            MXLog.error("The scanned device's server is not allowed: \(scannedServerName)")
-            progressSubject.send(completion: .failure(.qrCodeError(.providerNotAllowed(scannedProvider: scannedServerName, allowedProviders: appSettings.accountProviders))))
-            return progressSubject.asCurrentValuePublisher()
-        }
+
+        // n.b. We deliberatley don't check whether the received server is in our appSettings.accountProviders
 
         let listener = SDKListener { progress in
             guard let progress = QRLoginProgress(rustProgress: progress) else { return }
@@ -201,7 +199,7 @@
 
         Task {
             do {
-                let client = try await makeClient(homeserverAddress: scannedServerName)
+                let client = try await makeClient(homeserverAddress: scannedServerNameOrBaseUrl)
                 let qrCodeHandler = client.newLoginWithQrCodeHandler(oidcConfiguration: appSettings.oidcConfiguration.rustValue)
                 try await qrCodeHandler.scan(qrCodeData: qrData, progressListener: listener)
 
@@ -281,6 +279,8 @@
             .qrCodeError(.slidingSyncNotAvailable)
         case .OtherDeviceNotSignedIn:
             .qrCodeError(.deviceNotSignedIn)
+        case .UnsupportedQrCodeType:
+            .qrCodeError(.invalidQRCode)
         case .Unknown, .OidcMetadataInvalid, .CheckCodeAlreadySent, .CheckCodeCannotBeSent:
             .qrCodeError(.unknown)
         }

ElementX/Sources/Services/Authentication/LinkNewDeviceService.swift

@@ -201,6 +201,8 @@
             .cancelled
         case .OtherDeviceAlreadySignedIn:
             .deviceAlreadySignedIn
+        case .UnsupportedQrCodeType:
+            .invalidQRCode
         case .Unknown, .MissingSecretsBackup, .DeviceIdAlreadyInUse:
             .unknown
         }