Show an alert when entering an account provider that requires Element Pro. (#4326)

ElementX/Sources/Services/Client/Client.swift

@@ -0,0 +1,35 @@
+//
+// Copyright 2025 New Vector Ltd.
+//
+// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+// Please see LICENSE files in the repository root for full details.
+//
+
+import Foundation
+import MatrixRustSDK
+
+extension ClientProtocol {
+    func elementWellKnown() async -> Result<Data, ClientProxyError> {
+        let serverNameURLString = if let userIDServerName = try? userIdServerName() {
+            "https://\(userIDServerName)"
+        } else {
+            server() ?? homeserver()
+        }
+        
+        do {
+            guard let url = URL(string: serverNameURLString)?.appending(path: "/.well-known/element/element.json") else {
+                return .failure(.invalidServerName)
+            }
+            
+            let response = try await getUrl(url: url.absoluteString)
+            
+            guard let data = response.data(using: .utf8) else {
+                return .failure(.invalidResponse)
+            }
+            
+            return .success(data)
+        } catch {
+            return .failure(.sdkError(error))
+        }
+    }
+}

ElementX/Sources/Services/Client/ClientProxyProtocol.swift

@@ -34,6 +34,7 @@ enum ClientProxyError: Error {
     
     case invalidMedia
     case invalidServerName
+    case invalidResponse
     case failedUploadingMedia(ErrorKind)
     case roomPreviewIsPrivate
     case failedRetrievingUserIdentity