feat: support multipart/form-data format request (#1690)

* "add parser multipart/form-data"

* chore: fix impl

* chore: update impl

---------

Co-authored-by: JustSong <songquanpeng@foxmail.com>

common/gin.go

@@ -31,15 +31,15 @@ func UnmarshalBodyReusable(c *gin.Context, v any) error {
 	contentType := c.Request.Header.Get("Content-Type")
 	if strings.HasPrefix(contentType, "application/json") {
 		err = json.Unmarshal(requestBody, &v)
+		c.Request.Body = io.NopCloser(bytes.NewBuffer(requestBody))
 	} else {
-		// skip for now
+		c.Request.Body = io.NopCloser(bytes.NewBuffer(requestBody))
-		// TODO: someday non json request have variant model, we will need to implementation this
+		err = c.ShouldBind(&v)
 	}
 	if err != nil {
 		return err
 	}
 	// Reset request body
-	c.Request.Body = io.NopCloser(bytes.NewBuffer(requestBody))
 	return nil
 }
 

middleware/distributor.go

@@ -12,7 +12,7 @@ import (
 )
 
 type ModelRequest struct {
-	Model string `json:"model"`
+	Model string `json:"model" form:"model"`
 }
 
 func Distribute() func(c *gin.Context) {