fix: Show clear alert for expired AWS tokens

- Update error handling in BackendModel to detect expired token errors by checking if error.localizedDescription contains "expired".
- Set a specific alert message ("Your AWS credentials have expired. Please log in again.") when an expired token is detected.
- This change replaces the generic "BedrockError error 0" message with a clear re-login prompt.

Author: didhd

Amazon Bedrock Client for Mac/Managers/BedrockClient.swift

@@ -32,12 +32,13 @@ class BackendModel: ObservableObject {
             self.backend = try BackendModel.createBackend()
             logger.info("Backend initialized successfully")
         } catch {
-            logger.error(
-                "Failed to initialize Backend: \(error.localizedDescription). Using fallback Backend."
-            )
+            logger.error("Failed to initialize Backend: \(error.localizedDescription). Using fallback Backend.")
             self.backend = Backend.fallbackInstance()
-            alertMessage =
-            "Backend initialization failed: \(error.localizedDescription). Using fallback settings."
+            if error.localizedDescription.lowercased().contains("expired") {
+                alertMessage = "Your AWS credentials have expired. Please log in again."
+            } else {
+                alertMessage = "Backend initialization failed: \(error.localizedDescription). Using fallback settings."
+            }
         }
         setupObservers()
     }
@@ -489,29 +490,23 @@ class Backend: Equatable {
         maxResults: Int? = nil,
         nextToken: String? = nil,
         typeEquals: BedrockClientTypes.InferenceProfileType? = nil
-    ) async throws -> [BedrockClientTypes.InferenceProfileSummary] {
+    ) async -> [BedrockClientTypes.InferenceProfileSummary] {
         do {
-            // Prepare the request input
             let input = AWSBedrock.ListInferenceProfilesInput(
                 maxResults: maxResults,
                 nextToken: nextToken,
                 typeEquals: typeEquals
             )
-            
-            // Execute the API call
             let response = try await self.bedrockClient.listInferenceProfiles(input: input)
-            
-            // Validate and process the response
             guard let summaries = response.inferenceProfileSummaries else {
                 logger.warning("No inference profiles found in the response.")
                 return []
             }
-            
             logger.info("Fetched \(summaries.count) inference profiles.")
             return summaries
         } catch {
             logger.error("Failed to fetch inference profiles: \(error.localizedDescription)")
-            throw BedrockError.invalidResponse(error.localizedDescription)
+            return []
         }
     }
 
@@ -1399,7 +1394,24 @@ enum BedrockRuntimeError: Error {
     case decodingFailed
 }
 enum BedrockError: Error {
+    /// The response from Bedrock was invalid.
     case invalidResponse(String?)
-    case genericError(String)
-    case tokenExpired
+    /// The AWS credentials have expired.
+    case expiredToken(String?)
+    /// An unknown error occurred.
+    case unknown(String?)
+    
+    init(error: Error) {
+        if let awsError = error as? AWSClientRuntime.AWSServiceError {
+            if let typeName = awsError.typeName?.lowercased(), typeName.contains("expiredtoken") {
+                self = .expiredToken(awsError.message)
+            } else {
+                self = .unknown(awsError.message)
+            }
+        } else if let commonError = error as? AwsCommonRuntimeKit.CommonRunTimeError {
+            self = .invalidResponse(commonError.localizedDescription)
+        } else {
+            self = .unknown(error.localizedDescription)
+        }
+    }
 }

Amazon Bedrock Client for Mac/Views/MainView.swift

@@ -14,8 +14,6 @@ import Logging
 struct MainView: View {
     @State private var selection: SidebarSelection? = .newChat
     @State private var menuSelection: SidebarSelection? = nil
-    @State private var showAlert: Bool = false
-    @State private var alertMessage: String = ""
     @State private var organizedChatModels: [String: [ChatModel]] = [:]
     @State private var isHovering = false
     @State private var alertInfo: AlertInfo?
@@ -42,7 +40,8 @@ struct MainView: View {
         .navigationTitle("")
         .onChange(of: backendModel.backend) { _ in
             fetchModels()
-        }.onChange(of: selection) { newValue in
+        }
+        .onChange(of: selection) { newValue in
             if case .chat(let chat) = newValue {
                 if !chatManager.chats.contains(where: { $0.chatId == chat.chatId }) {
                     selection = .newChat
@@ -117,46 +116,27 @@ struct MainView: View {
     }
 
     private func handleFetchModelsError(_ error: Error) {
-        if let awsError = error as? AWSClientRuntime.AWSServiceError {
-            let errorType = awsError.typeName ?? "Unknown AWS Error"
-            var errorMessage = awsError.message ?? "No error message provided"
-            
-            if errorType == "ExpiredTokenException" {
-                errorMessage += "\nPlease log in again."
-            }
-            
+        let bedrockError = BedrockError(error: error)
+        switch bedrockError {
+        case .expiredToken(let message):
             self.alertInfo = AlertInfo(
-                title: "\(errorType)",
-                message: errorMessage
+                title: "Expired Token",
+                message: message ?? "Your AWS credentials have expired. Please log in again."
             )
-        } else if let crtError = error as? AwsCommonRuntimeKit.CRTError {
+        case .invalidResponse(let message):
             self.alertInfo = AlertInfo(
-                title: "CRT Error",
-                message: "Code: \(crtError.code), Message: \(crtError.message)"
+                title: "Invalid Response",
+                message: message ?? "The response from Bedrock was invalid."
             )
-        } else if let commonRunTimeError = error as? AwsCommonRuntimeKit.CommonRunTimeError {
-            self.alertInfo = AlertInfo(
-                title: "CommonRunTime Error",
-                message: "Error: \(commonRunTimeError)"
-            )
-        } else {
-            // 알 수 없는 에러 타입에 대한 더 자세한 정보 제공
+        case .unknown(let message):
             self.alertInfo = AlertInfo(
                 title: "Unknown Error",
-                message: "Type: \(type(of: error)), Description: \(error.localizedDescription)"
+                message: message ?? "An unknown error occurred."
             )
         }
-        
-        // 로깅 추가
+        logger.error("Fetch Models Error - \(self.alertInfo?.title ?? "Error"): \(self.alertInfo?.message ?? "No message")")
         print("Error type: \(type(of: error))")
         print("Error description: \(error)")
-        
-        if let alertInfo = self.alertInfo {
-            logger.error("Fetch Models Error - \(alertInfo.title): \(alertInfo.message)")
-        } else {
-            logger.error("Fetch Models Error occurred, but alertInfo is nil")
-        }
-        logger.error("Error details: \(String(describing: error))")
     }
 
     private func selectDefaultModel() {