Fix duplicate responses

app/http/middleware/errorhandler.go

@@ -1,6 +1,7 @@
 package middleware
 
 import (
+	"bytes"
 	"errors"
 	"github.com/TicketsBot/GoPanel/app"
 	"github.com/gin-gonic/gin"
@@ -10,7 +11,19 @@ type ErrorResponse struct {
 	Error string `json:"error"`
 }
 
+type copyWriter struct {
+	gin.ResponseWriter
+	buf *bytes.Buffer
+}
+
+func (cw copyWriter) Write(b []byte) (int, error) {
+	return cw.buf.Write(b)
+}
+
 func ErrorHandler(c *gin.Context) {
+	cw := &copyWriter{buf: &bytes.Buffer{}, ResponseWriter: c.Writer}
+	c.Writer = cw
+
 	c.Next()
 
 	if len(c.Errors) > 0 {
@@ -26,11 +39,17 @@ func ErrorHandler(c *gin.Context) {
 		c.JSON(-1, ErrorResponse{
 			Error: message,
 		})
+
+		return
 	}
 
-	if c.Writer.Status() >= 500 && len(c.Errors) == 0 {
+	if c.Writer.Status() >= 500 {
 		c.JSON(-1, ErrorResponse{
 			Error: "An internal server error occurred",
 		})
+
+		return
 	}
+
+	c.Writer.Write(cw.buf.Bytes())
 }