chore(backend.js): better error handling

src/js/serverUtils.js

@@ -128,10 +128,10 @@ const activeSessions = new Map();
 
 // Utility function to create a timeout promise
 const timeoutPromise = (ms) => {
-  return new Promise((_, reject) => {
-    setTimeout(() => reject(new Error(`Request timed out after ${ms}ms`)), ms);
-  });
-};
+    return new Promise((_, reject) => {
+      setTimeout(() => reject(new ApiTimeoutError(`Request timed out after ${ms}ms`)), ms);
+    });
+  };
 
 // Helper function to ensure login
 const ensureLogin = async (ssoToken) => {
@@ -154,35 +154,78 @@ const ensureLogin = async (ssoToken) => {
 };
 
 // Helper function to handle API errors
-const handleApiError = (error, res) => {
-  logger.error('API Error:', error);
-  logger.error(`Error Stack: ${error.stack}`);
-  logger.error(`Error Time: ${global.Utils.toIsoString(new Date())}`);
-
-  // Try to extract more useful information from the error
-  let errorMessage = error.message || 'Unknown API error';
-  let errorName = error.name || 'ApiError';
-
-  // Handle the specific JSON parsing error
-  if (errorName === 'SyntaxError' && errorMessage.includes('JSON')) {
-    logger.debug('JSON parsing error detected');
-    return res.status(200).json({
-      status: 'error',
-      message:
-        'Failed to parse API response. This usually means the SSO token is invalid or expired.',
-      error_type: 'InvalidResponseError',
-      timestamp: global.Utils.toIsoString(new Date()),
-    });
+class ApiTimeoutError extends Error {
+    constructor(message = 'API request timed out') {
+      super(message);
+      this.name = 'ApiTimeoutError';
+    }
   }
-
-  // Send a more graceful response
-  return res.status(200).json({
-    status: 'error',
-    message: errorMessage,
-    error_type: errorName,
-    timestamp: global.Utils.toIsoString(new Date()),
-  });
-};
+  
+  class ApiAuthError extends Error {
+    constructor(message = 'Authentication failed') {
+      super(message);
+      this.name = 'ApiAuthError';
+    }
+  }
+  
+  class ApiDataError extends Error {
+    constructor(message = 'Data processing error') {
+      super(message);
+      this.name = 'ApiDataError';
+    }
+  }
+  
+  // Helper function to handle API errors
+  const handleApiError = (error, res) => {
+    logger.error('API Error:', error);
+    logger.error(`Error Stack: ${error.stack}`);
+    logger.error(`Error Time: ${global.Utils.toIsoString(new Date())}`);
+  
+    // Map error types to appropriate responses
+    const errorResponses = {
+      'ApiTimeoutError': {
+        status: 200,
+        body: {
+          status: 'error',
+          message: 'The request timed out. Please try again.',
+          error_type: 'timeout',
+          timestamp: global.Utils.toIsoString(new Date())
+        }
+      },
+      'ApiAuthError': {
+        status: 200,
+        body: {
+          status: 'error',
+          message: 'Authentication failed. Please check your SSO token.',
+          error_type: 'auth_failure',
+          timestamp: global.Utils.toIsoString(new Date())
+        }
+      },
+      'SyntaxError': {
+        status: 200,
+        body: {
+          status: 'error',
+          message: 'Failed to parse API response. This usually means the SSO token is invalid or expired.',
+          error_type: 'InvalidResponseError',
+          timestamp: global.Utils.toIsoString(new Date())
+        }
+      },
+      'default': {
+        status: 200,
+        body: {
+          status: 'error',
+          message: error.message || 'An unknown error occurred',
+          error_type: error.name || 'UnknownError',
+          timestamp: global.Utils.toIsoString(new Date())
+        }
+      }
+    };
+  
+    // Get the appropriate response or use default
+    const response = errorResponses[error.name] || errorResponses.default;
+    
+    return res.status(response.status).json(response.body);
+  };
 
 // Helper function to remove sensitive data from headers
 function sanitizeHeaders(headers) {