feat: add validate for user signup

internal/howmuch/adapter/controller/user.go

@@ -29,6 +29,7 @@ import (
 	"git.vinchent.xyz/vinchent/howmuch/internal/howmuch/usecase/usecase"
 	"git.vinchent.xyz/vinchent/howmuch/internal/pkg/core"
 	"git.vinchent.xyz/vinchent/howmuch/internal/pkg/errno"
+	"github.com/asaskevich/govalidator"
 	"github.com/gin-gonic/gin"
 )
 
@@ -66,9 +67,15 @@ func (uc *UserController) Signup(ctx core.Context) {
 		return
 	}
 
-	// TODO: check params validity (govalidator)
+	_, err := govalidator.ValidateStruct(params)
+	if err != nil {
+		errno := UserParamsErr
+		errno.Message = err.Error()
+		core.WriteResponse(ctx, errno, nil)
+		return
+	}
 
-	_, err := uc.userUsecase.Create(ctx, &params)
+	_, err = uc.userUsecase.Create(ctx, &params)
 	if err != nil {
 		core.WriteResponse(ctx, err, nil)
 		return

internal/howmuch/model/user.go

@@ -27,10 +27,10 @@ import "time"
 // User model
 type User struct {
 	ID        int       `json:"id"`
-	Email     string    `json:"email"`
-	FirstName string    `json:"first_name"`
-	LastName  string    `json:"last_name"`
-	Password  string    `json:"password"`
+	Email     string    `json:"email"      valid:"email"`
+	FirstName string    `json:"first_name" valid:"required"`
+	LastName  string    `json:"last_name"  valid:"required"`
+	Password  string    `json:"password"   valid:"required"`
 	CreatedAt time.Time `json:"created_at"`
 	UpdatedAt time.Time `json:"updated_at"`
 }

internal/howmuch/usecase/usecase/user.go

@@ -25,12 +25,21 @@ package usecase
 import (
 	"context"
 	"fmt"
+	"net/http"
+	"regexp"
 
 	"git.vinchent.xyz/vinchent/howmuch/internal/howmuch/model"
 	"git.vinchent.xyz/vinchent/howmuch/internal/howmuch/usecase/repo"
+	"git.vinchent.xyz/vinchent/howmuch/internal/pkg/errno"
 	"git.vinchent.xyz/vinchent/howmuch/internal/pkg/log"
 )
 
+var UserExisted = &errno.Errno{
+	HTTP:    http.StatusBadRequest,
+	Code:    errno.ErrorCode(errno.FailedOperationCode, "UserExisted"),
+	Message: "email already existed.",
+}
+
 type userUsecase struct {
 	userRepo repo.UserRepository
 	dbRepo   repo.DBRepository
@@ -51,12 +60,12 @@ func (uuc *userUsecase) Create(ctx context.Context, u *model.User) (*model.User,
 	data, err := uuc.dbRepo.Transaction(
 		ctx,
 		func(txCtx context.Context, tx interface{}) (interface{}, error) {
-			// TODO: should check if the user exists
-			// DB will return an error since we have set email to UNIQUE.
-			// But we may not want to expose the exact db error.
-
 			u, err := uuc.userRepo.Create(txCtx, tx, u)
 			if err != nil {
+				match, _ := regexp.MatchString("SQLSTATE 23505", err.Error())
+				if match {
+					return nil, UserExisted
+				}
 				return nil, err
 			}