fixed JWT valide error whent get user by id failed

internal/servants/chain/jwt.go

@@ -25,7 +25,6 @@ func JWT() gin.HandlerFunc {
 			token = s
 		} else {
 			token = c.GetHeader("Authorization")
-
 			// 验证前端传过来的token格式，不为空，开头为Bearer
 			if token == "" || !strings.HasPrefix(token, "Bearer ") {
 				response := app.NewResponse(c)
@@ -33,47 +32,41 @@ func JWT() gin.HandlerFunc {
 				c.Abort()
 				return
 			}
-
 			// 验证通过，提取有效部分（除去Bearer)
 			token = token[7:]
 		}
-		if token == "" {
-			ecode = xerror.InvalidParams
+		if token != "" {
+			if claims, err := app.ParseToken(token); err == nil {
+				// 加载用户信息
+				if user, err := ums.GetUserByID(claims.UID); err == nil {
+					// 强制下线机制
+					if (conf.JWTSetting.Issuer + ":" + user.Salt) == claims.Issuer {
+						c.Set("USER", user)
+						c.Set("UID", claims.UID)
+						c.Set("USERNAME", claims.Username)
 					} else {
-			claims, err := app.ParseToken(token)
-			if err != nil {
-				switch err.(*jwt.ValidationError).Errors {
-				case jwt.ValidationErrorExpired:
 						ecode = xerror.UnauthorizedTokenTimeout
-				default:
-					ecode = xerror.UnauthorizedTokenError
 					}
-			} else {
-				c.Set("UID", claims.UID)
-				c.Set("USERNAME", claims.Username)
-
-				// 加载用户信息
-				user, err := ums.GetUserByID(claims.UID)
-				if err == nil {
-					c.Set("USER", user)
 				} else {
 					ecode = xerror.UnauthorizedAuthNotExist
 				}
-
-				// 强制下线机制
-				if (conf.JWTSetting.Issuer + ":" + user.Salt) != claims.Issuer {
+			} else {
+				switch err.(*jwt.ValidationError).Errors {
+				case jwt.ValidationErrorExpired:
 					ecode = xerror.UnauthorizedTokenTimeout
+				default:
+					ecode = xerror.UnauthorizedTokenError
 				}
 			}
+		} else {
+			ecode = xerror.InvalidParams
 		}
-
 		if ecode != xerror.Success {
 			response := app.NewResponse(c)
 			response.ToErrorResponse(ecode)
 			c.Abort()
 			return
 		}
-
 		c.Next()
 	}
 }
@@ -94,11 +87,11 @@ func JwtLoose() gin.HandlerFunc {
 		}
 		if len(token) > 0 {
 			if claims, err := app.ParseToken(token); err == nil {
-				c.Set("UID", claims.UID)
-				c.Set("USERNAME", claims.Username)
 				// 加载用户信息
 				user, err := ums.GetUserByID(claims.UID)
 				if err == nil && (conf.JWTSetting.Issuer+":"+user.Salt) == claims.Issuer {
+					c.Set("UID", claims.UID)
+					c.Set("USERNAME", claims.Username)
 					c.Set("USER", user)
 				}
 			}