added error message

handlers/google_auth.go

@@ -162,7 +162,32 @@ func GoogleCallback(w http.ResponseWriter, r *http.Request) {
 
 	userInfo, err := FetchGoogleUserInfo(w, r)
 	if err != nil {
-		helper.RespondWithError(w, http.StatusBadGateway, "Failed to fetch user information from Google")
+		errMsg := err.Error()
+		helper.LogError(err, "Failed to fetch Google user info")
+		
+		// Provide user-friendly error messages for different scenarios
+		if strings.Contains(errMsg, "TLS handshake timeout") {
+			helper.RespondWithError(w, http.StatusGatewayTimeout, "Connection to Google failed due to network issues. Please try again in a moment.")
+			return
+		}
+		if strings.Contains(errMsg, "timeout") {
+			helper.RespondWithError(w, http.StatusGatewayTimeout, "Request to Google took too long. Please try again.")
+			return
+		}
+		if strings.Contains(errMsg, "connection refused") || strings.Contains(errMsg, "no such host") {
+			helper.RespondWithError(w, http.StatusServiceUnavailable, "Unable to reach Google authentication servers. Please check your internet connection and try again.")
+			return
+		}
+		if strings.Contains(errMsg, "status 401") {
+			helper.RespondWithError(w, http.StatusUnauthorized, "Invalid authorization code. Please start the login process again.")
+			return
+		}
+		if strings.Contains(errMsg, "status 403") {
+			helper.RespondWithError(w, http.StatusForbidden, "Access to Google authentication was denied. Please try again later.")
+			return
+		}
+		
+		helper.RespondWithError(w, http.StatusBadGateway, "Failed to fetch user information from Google. Please try again.")
 		return
 	}
 
@@ -295,25 +320,48 @@ func FetchGoogleUserInfo(w http.ResponseWriter, r *http.Request) (models.UserGoo
 	log.Print("Authorization code received: ", code)
 	token, err := googleOauthConfig.Exchange(context.Background(), code)
 	if err != nil {
-		helper.LogError(err, "Error exchanging token")
-		// http.Redirect(w, r, DashboardBaseURL, http.StatusSeeOther)
-		return models.UserGoogleInfo{}, err
+		helper.LogError(err, "Error exchanging authorization code for token")
+		return models.UserGoogleInfo{}, fmt.Errorf("failed to exchange authorization code: %w", err)
 	}
 
 	helper.LogInfo(fmt.Sprintf("Access Token: %s", token.AccessToken))
 
-	client := googleOauthConfig.Client(context.Background(), token)
+	// Create a context with a 30-second timeout for the userinfo request
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	client := googleOauthConfig.Client(ctx, token)
 	req, err := http.NewRequest("GET", "https://www.googleapis.com/oauth2/v1/userinfo?alt=json", nil)
 	if err != nil {
-		helper.LogError(err, "Error creating request")
-		return models.UserGoogleInfo{}, err
+		helper.LogError(err, "Error creating request to fetch user info")
+		return models.UserGoogleInfo{}, fmt.Errorf("failed to create userinfo request: %w", err)
 	}
 	req.Header.Set("Authorization", bearerPrefix+token.AccessToken)
+	req = req.WithContext(ctx)
 
 	resp, err := client.Do(req)
 	if err != nil {
-		helper.LogError(err, "Error sending request")
-		return models.UserGoogleInfo{}, err
+		errMsg := fmt.Sprintf("Failed to fetch user info from Google: %v", err)
+		helper.LogError(err, errMsg)
+		
+		// Provide more specific error messages for common issues
+		if os.IsTimeout(err) {
+			return models.UserGoogleInfo{}, fmt.Errorf("request timed out: Google userinfo endpoint took too long to respond (timeout: 30s)")
+		}
+		if strings.Contains(err.Error(), "net/http: TLS handshake timeout") {
+			return models.UserGoogleInfo{}, fmt.Errorf("TLS handshake timeout: Unable to establish secure connection to Google")
+		}
+		if strings.Contains(err.Error(), "context deadline exceeded") {
+			return models.UserGoogleInfo{}, fmt.Errorf("request deadline exceeded: Connection attempt exceeded 30 second timeout")
+		}
+		if strings.Contains(err.Error(), "connection refused") {
+			return models.UserGoogleInfo{}, fmt.Errorf("connection refused: Cannot reach Google servers")
+		}
+		if strings.Contains(err.Error(), "no such host") {
+			return models.UserGoogleInfo{}, fmt.Errorf("DNS resolution failed: Cannot resolve googleapis.com")
+		}
+		
+		return models.UserGoogleInfo{}, fmt.Errorf("network error while fetching user info: %w", err)
 	}
 	defer func(Body io.ReadCloser) {
 		err := Body.Close()
@@ -322,10 +370,18 @@ func FetchGoogleUserInfo(w http.ResponseWriter, r *http.Request) (models.UserGoo
 		}
 	}(resp.Body)
 
+	// Check HTTP status code
+	if resp.StatusCode != http.StatusOK {
+		bodyBytes, _ := io.ReadAll(resp.Body)
+		errMsg := fmt.Sprintf("Google API returned status %d: %s", resp.StatusCode, string(bodyBytes))
+		helper.LogError(nil, errMsg)
+		return models.UserGoogleInfo{}, fmt.Errorf("google api error (status %d): %s", resp.StatusCode, string(bodyBytes))
+	}
+
 	var userInfo models.UserGoogleInfo
 	if err := json.NewDecoder(resp.Body).Decode(&userInfo); err != nil {
-		helper.LogError(err, "Error decoding user info")
-		return models.UserGoogleInfo{}, err
+		helper.LogError(err, "Error decoding user info from Google response")
+		return models.UserGoogleInfo{}, fmt.Errorf("failed to parse user info response: %w", err)
 	}
 	return userInfo, nil
 }