fix domain validator

Co-Authored-By: Alireza Ahmadi <alireza7@gmail.com>

web/middleware/domainValidator.go

@@ -3,6 +3,7 @@ package middleware
 import (
 	"net"
 	"net/http"
+	"strings"
 
 	"github.com/gin-gonic/gin"
 )
@@ -14,12 +15,17 @@ func DomainValidatorMiddleware(domain string) gin.HandlerFunc {
 			host = c.GetHeader("X-Real-IP")
 		}
 		if host == "" {
-			host, _, _ := net.SplitHostPort(c.Request.Host)
+			host = c.Request.Host
+			if colonIndex := strings.LastIndex(host, ":"); colonIndex != -1 {
+				host, _, _ = net.SplitHostPort(host)
+			}
+		}
+
 		if host != domain {
 			c.AbortWithStatus(http.StatusForbidden)
 			return
 		}
+
 		c.Next()
 	}
 }
-}