Dragonfly2

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/*
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 *     Copyright 2020 The Dragonfly Authors
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package middlewares
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import (
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	"errors"
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	"net/http"
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	"github.com/VividCortex/mysqlerr"
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	"github.com/gin-gonic/gin"
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	"github.com/go-redis/redis/v8"
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	"github.com/go-sql-driver/mysql"
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	redigo "github.com/gomodule/redigo/redis"
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	"golang.org/x/crypto/bcrypt"
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	"gorm.io/gorm"
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	commonv1 "d7y.io/api/v2/pkg/apis/common/v1"
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	"d7y.io/dragonfly/v2/internal/dferrors"
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)
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type ErrorResponse struct {
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	Message     string `json:"message,omitempty"`
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	Error       string `json:"errors,omitempty"`
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	DocumentURL string `json:"documentation_url,omitempty"`
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}
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func Error() gin.HandlerFunc {
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	return func(c *gin.Context) {
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		c.Next()
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		err := c.Errors.Last()
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		if err == nil {
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			return
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		}
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		// Redigo error handler
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		if errors.Is(err, redigo.ErrNil) {
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			c.JSON(http.StatusNotFound, ErrorResponse{
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				Message: http.StatusText(http.StatusNotFound),
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			})
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			c.Abort()
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			return
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		}
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		// RPC error handler
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		var dferr *dferrors.DfError
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		if errors.As(err.Err, &dferr) {
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			switch dferr.Code {
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			case commonv1.Code_InvalidResourceType:
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				c.JSON(http.StatusBadRequest, ErrorResponse{
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					Message: http.StatusText(http.StatusBadRequest),
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				})
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				c.Abort()
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				return
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			default:
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				c.JSON(http.StatusInternalServerError, ErrorResponse{
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					Message: http.StatusText(http.StatusInternalServerError),
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				})
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				c.Abort()
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				return
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			}
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		}
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		// Bcrypt error handler
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		if errors.Is(err, bcrypt.ErrMismatchedHashAndPassword) {
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			c.JSON(http.StatusUnauthorized, ErrorResponse{
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				Message: http.StatusText(http.StatusUnauthorized),
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			})
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			c.Abort()
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			return
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		}
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		// GORM error handler
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		if errors.Is(err.Err, gorm.ErrRecordNotFound) {
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			c.JSON(http.StatusNotFound, ErrorResponse{
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				Message: http.StatusText(http.StatusNotFound),
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			})
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			c.Abort()
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			return
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		}
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		// Mysql error handler
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		var merr *mysql.MySQLError
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		if errors.As(err.Err, &merr) {
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			switch merr.Number {
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			case mysqlerr.ER_DUP_ENTRY:
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				c.JSON(http.StatusConflict, ErrorResponse{
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					Message: http.StatusText(http.StatusConflict),
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				})
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				c.Abort()
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				return
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			default:
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				c.JSON(http.StatusInternalServerError, ErrorResponse{
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					Message: http.StatusText(http.StatusInternalServerError),
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				})
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				c.Abort()
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				return
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			}
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		}
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		if errors.Is(err.Err, redis.Nil) {
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			c.JSON(http.StatusNotFound, ErrorResponse{
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				Message: http.StatusText(http.StatusNotFound),
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			})
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			c.Abort()
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			return
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		}
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		// Unknown error
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		c.JSON(http.StatusInternalServerError, ErrorResponse{
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			Message: err.Err.Error(),
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		})
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	}
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}
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