feat: check if username is unique

#4

cmd/server/db/pg/migrations/20241215144535.sql

@@ -0,0 +1,2 @@
+-- Modify "users" table
+ALTER TABLE "public"."users" ADD CONSTRAINT "uni_users_username" UNIQUE ("username");

cmd/server/db/pg/migrations/atlas.sum

@@ -1,2 +1,3 @@
-h1:1+jHxSQv5CtJQzmPjUrQ8E1amoPSgYLGifsr7kJb0OQ=
+h1:8I10qPxan1M69VysUB8sFDCPn0I7xQCKR5oUwDqmSMA=
 20241214073731.sql h1:H/c5Cccdg1k8DzB+qpeI5Ay2Oh2CBrAIWXKTepKSREM=
+20241215144535.sql h1:Pp7oLdKWMHkwqaafy7RSuHSBkOGVHRoSL+zmEiwQm9Q=

internal/pkg/auth/svc/auth.svc.go

@@ -102,12 +102,10 @@ func (s *AuthService) Register(user *ent.User) (*string, *ent.User, error) {
 	user.CreatedAt = time.Now()
 	user.State = ent.Suspended
 
-	// Save user to DB
 	if err := s.db.GetDB().Create(user).Error; err != nil {
 		return nil, nil, err
 	}
 
-	// Generate JWT token
 	token, err := s.generateJWT(user)
 	if err != nil {
 		return nil, nil, err

internal/pkg/user/ctrl/user.ctrl.go

@@ -60,22 +60,6 @@ func (c UserController) GetUser(_ context.Context, request *pb.GetUserRequest) (
 	}, nil
 }
 
-func (c UserController) CreateUser(_ context.Context, request *pb.CreateUserRequest) (*pb.User, error) {
-	user, err := c.userService.CreateUser(&ent.User{
-		Username: request.Username,
-		Password: request.Password,
-		Email:    request.Email,
-	})
-	if err != nil {
-		return nil, err
-	}
-	return &pb.User{
-		Id:       user.ID.String(),
-		Username: user.Username,
-		Email:    user.Email,
-	}, err
-}
-
 func (c UserController) UpdateUser(_ context.Context, request *pb.UpdateUserRequest) (*pb.User, error) {
 	user, err := c.userService.UpdateUser(&ent.User{
 		ID:       uuid.MustParse(request.Id),

internal/pkg/user/ent/user.ent.go

@@ -16,17 +16,15 @@ const (
 type User struct {
 	gorm.Model
 	ID       uuid.UUID `gorm:"type:uuid;primaryKey"`
-	Username string    `gorm:"type:varchar(255);not null"`
+	Username string    `gorm:"type:varchar(255);unique;not null"`
 	Email    string    `gorm:"type:varchar(255);unique;not null"`
 	Password string    `gorm:"type:varchar(255);not null"`
 	State    UserState `gorm:"type:smallint;default:100"` // Default to Suspended
 	Friends  []*User   `gorm:"many2many:friendships;joinForeignKey:UserID;joinReferences:FriendID"`
 }
 
-// BeforeCreate Hook for generating custom UUID
+// BeforeCreate Hook for generating UUID
 func (u *User) BeforeCreate(tx *gorm.DB) (err error) {
-	// Generate custom UUID for user
 	u.ID = uuid.New()
-	//todo: generate hashed password here ONLY
 	return nil
 }

internal/pkg/user/svc/user.svc.go

@@ -3,11 +3,8 @@ package svc
 import (
 	pb "app/internal/core/grpc/generated"
 	"app/internal/pkg/user/ent"
-	"errors"
 	"fmt"
 	gossiper "github.com/pieceowater-dev/lotof.lib.gossiper/v2"
-	"golang.org/x/crypto/bcrypt"
-	"gorm.io/gorm"
 )
 
 type UserService struct {
@@ -18,24 +15,9 @@ func NewUserService(db gossiper.Database) *UserService {
 	return &UserService{db: db}
 }
 
-func (s *UserService) CreateUser(user *ent.User) (*ent.User, error) { // todo: delete this later
-	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(user.Password), bcrypt.DefaultCost)
-	if err != nil {
-		return nil, err
-	}
-	user.Password = string(hashedPassword)
-	if err := s.db.GetDB().Create(user).Error; err != nil {
-		if errors.Is(err, gorm.ErrDuplicatedKey) {
-			return nil, errors.New("email already exists")
-		}
-		return nil, err
-	}
-	return user, nil
-}
-
 func (s *UserService) GetUserByID(id string) (*ent.User, error) {
 	var user ent.User
-	if err := s.db.GetDB().Preload("Friends").First(&user, "id = ?", id).Error; err != nil {
+	if err := s.db.GetDB().First(&user, "id = ?", id).Error; err != nil {
 		return nil, err
 	}
 	return &user, nil