Handle empty body in TestDataSourceConnection

Update TestDataSourceConnection to support requests with an empty body by loading the existing data source config if available. Returns 404 if the data source is not found, otherwise proceeds as before.

Author: hhftechnology

api/handlers/datasource.go

@@ -1,15 +1,15 @@
 package handlers
 
 import (
-    "context"
-    "fmt"
-    "log"
-    "net/http"
-    "time"
-    
-    "github.com/gin-gonic/gin"
-    "github.com/hhftechnology/middleware-manager/models"
-    "github.com/hhftechnology/middleware-manager/services"
+	"context"
+	"fmt"
+	"log"
+	"net/http"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/hhftechnology/middleware-manager/models"
+	"github.com/hhftechnology/middleware-manager/services"
 )
 
 // DataSourceHandler handles data source configuration requests
@@ -117,8 +117,19 @@ func (h *DataSourceHandler) TestDataSourceConnection(c *gin.Context) {
 
     var config models.DataSourceConfig
     if err := c.ShouldBindJSON(&config); err != nil {
-        ResponseWithError(c, http.StatusBadRequest, fmt.Sprintf("Invalid request: %v", err))
-        return
+        if err.Error() == "EOF" {
+            // Request body is empty, try to get existing config
+            sources := h.ConfigManager.GetDataSources()
+            if source, ok := sources[name]; ok {
+                config = source
+            } else {
+                ResponseWithError(c, http.StatusNotFound, fmt.Sprintf("Data source '%s' not found", name))
+                return
+            }
+        } else {
+            ResponseWithError(c, http.StatusBadRequest, fmt.Sprintf("Invalid request: %v", err))
+            return
+        }
     }
 
     // Create a context with timeout