Go - Error

I used the following codes to do request validation and user retrieval from the authorization header

• In the handler.go file

func VerifyJSONAndGetUser(ctx *gin.Context, req any, store *db.Store, authKey string) (*db.User, error) {
 // ensure the request body is a valid JSON
 if err:= ctx.ShouldBindJSON(&req); err!= nil {
 ctx.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
 return nil, err
 }

 // get user
 userID:= ctx.MustGet(authKey).(*token.Payload).QueryID
 user, err:= store.GetUserByID(ctx, userID)
 if err!= nil {
 ctx.JSON(http.StatusNotFound, gin.H{"error": "user not found"})
 return nil, err
 }
 return &user, nil
}

• In the /api/users.go file

type UpdateUserRequest struct {
 Email string `json:"email" binding:"required"`
 Gender db.Gender `json:"gender"`
 Password string `json:"password"`
 FirstName string `json:"first_name"`
 LastName string `json:"last_name"`
 Language db.LanguageCode `json:"language" binding:"required"`
 Address string `json:"address"`
 LineID pgtype.Text `json:"line_id"`
 Phone pgtype.Text `json:"phone"`
 Latitude pgtype.Float8 `json:"latitude"`
 Longitude pgtype.Float8 `json:"longitude"`
 BirthYear pgtype.Int4 `json:"birth_year"`
}

func (server *Server) UpdateUser(ctx *gin.Context) {
 // get old user information
 oldUser, err:= helpers.VerifyJSONAndGetUser(ctx, req, server.store, authorizationPayloadKey)
 if err!= nil {
 server.ErrorLogger.Println(err)
 }

 // update user in database
 arg:= db.UpdateUserByIdParams{
 ID: oldUser.ID,
 Email: req.Email,
 Phone: req.Phone,
 Password: oldUser.Password,
 FirstName: req.FirstName,
 LastName: req.LastName,
 Language: req.Language,
 Address: req.Address,
 LineID: req.LineID,
 Gender: req.Gender,
 BirthYear: req.BirthYear,
 Latitude: req.Latitude,
 Longitude: req.Longitude,
 }
 user, err:= server.store.UpdateUserById(ctx, arg)
 if err!= nil {
 ctx.JSON(http.StatusConflict, apierrors.UserRegistrationError(err))
 server.ErrorLogger.Println(err)
 return
 }

 // return updated user
 ctx.JSON(http.StatusOK, server.userResponse(user))
}

This did not work because:

• the data type of the parameter req was set to any. This prevents go from type-casting the string value of the Language field to db.LanguageCode type.

• The Updated code should be:

• In the handler.go file

func AuthAndGetUser(ctx *gin.Context, req any, store *db.Store, authKey string) (*db.User, error) {
// get user
userID:= ctx.MustGet(authKey).(*token.Payload).QueryID
user, err:= store.GetUserByID(ctx, userID)
if err!= nil {
ctx.JSON(http.StatusNotFound, gin.H{"error": "user not found"})
return nil, err
}
return &user, nil
}

• In the /api/users.go file

func (server *Server) UpdateUser(ctx *gin.Context) {
// ensure the request body is a valid JSON
var req UpdateUserRequest
if err:= ctx.ShouldBindJSON(&req); err!= nil {
ctx.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return
}

// get old user information
oldUser, err:= helpers.AuthAndGetUser(ctx, req, server.store, authorizationPayloadKey)
if err!= nil {
server.ErrorLogger.Println(err)
}

// update user in database
arg:= db.UpdateUserByIdParams{
ID: oldUser.ID,
Email: req.Email,
Phone: req.Phone,
Password: oldUser.Password,
FirstName: req.FirstName,
LastName: req.LastName,
Language: req.Language,
Address: req.Address,
LineID: req.LineID,
Gender: req.Gender,
BirthYear: req.BirthYear,
Latitude: req.Latitude,
Longitude: req.Longitude,
}
user, err:= server.store.UpdateUserById(ctx, arg)
if err!= nil {
ctx.JSON(http.StatusConflict, apierrors.UserRegistrationError(err))
server.ErrorLogger.Println(err)
return
}

// return updated user
ctx.JSON(http.StatusOK, server.userResponse(user))
}