feat: +register

package/backend/internal/user/errors.go

@@ -0,0 +1,6 @@
+package user
+
+import "errors"
+
+var ErrDuplicateKey = errors.New("duplicate key")
+var ErrEmailAlreadyExists = errors.New("email already exists")

package/backend/internal/user/handler.go

@@ -0,0 +1,86 @@
+package user
+
+import (
+	"errors"
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"net/mail"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+type Handler struct {
+	service Service
+}
+
+func NewHandler(pool *pgxpool.Pool) Handler {
+	return Handler {
+		service: NewService(NewRepo(pool)),
+	}
+}
+
+type RegisterRequest struct {
+	Email    string `json:"email"`
+	Password string `json:"password"`
+}
+
+type RegisterValidationError struct {
+	message string
+}
+
+func (e RegisterValidationError) Error() string {
+	return e.message
+}
+
+func (req RegisterRequest) Validate() error {
+	if _, err := mail.ParseAddress(req.Email); err != nil {
+		return RegisterValidationError {
+			message: "invalid email",
+		}
+	}
+
+	if len(req.Password) < 10 {
+		return RegisterValidationError {
+			message: "password is too short",
+		}
+	}
+
+	return nil
+}
+
+func (h Handler) RegisterHandler(w http.ResponseWriter, r *http.Request) {
+	var req RegisterRequest
+
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		http.Error(w, "invalid json", http.StatusBadRequest)
+		return
+	}
+
+	if err := req.Validate(); err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	err := h.service.Register(r.Context(), req.Email, req.Password)
+	if err != nil {
+		log.Println("could not register: ", err)
+		switch {
+		case errors.Is(err, ErrEmailAlreadyExists):
+			http.Error(w, "email already exists", http.StatusConflict)
+		default:
+			http.Error(w, "internal error", http.StatusInternalServerError)
+		}
+		return
+	}
+
+	w.WriteHeader(http.StatusCreated)
+	fmt.Fprintln(w, "success")
+}
+
+func (h Handler) AttachHandlers(router chi.Router) {
+	router.Post("/register", h.RegisterHandler)
+	// router.Post("/login", LoginHandler)
+}

package/backend/internal/user/repo.go

@@ -0,0 +1,46 @@
+package user
+
+import (
+	"context"
+	"errors"
+
+	// "github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgconn"
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+type Repo struct {
+	pool *pgxpool.Pool
+}
+
+func NewRepo(pool *pgxpool.Pool) Repo {
+	return Repo {
+		pool: pool,
+	}
+}
+
+func (r *Repo) Exec(ctx context.Context, query string, args ...any) (pgconn.CommandTag, error) {
+	conn, err := r.pool.Acquire(context.Background())
+	if err != nil {
+		return pgconn.CommandTag{}, err
+	}
+
+	return conn.Exec(ctx, query, args...)
+}
+
+func (r *Repo) CreateUser(ctx context.Context, email, hash string) error {
+	_, err := r.Exec(
+		ctx,
+		"INSERT INTO users(email, password_hash) VALUES ($1, $2)",
+		email, hash,
+	)
+
+	if err != nil {
+		var pgErr *pgconn.PgError
+		if errors.As(err, &pgErr) {
+			return ErrDuplicateKey
+		}
+	}
+
+	return err
+}

package/backend/internal/user/service.go

@@ -0,0 +1,41 @@
+package user
+
+import (
+	"context"
+	"errors"
+
+	"golang.org/x/crypto/bcrypt"
+)
+
+type Service struct {
+	repo Repo
+}
+
+func NewService(repo Repo) Service {
+	return Service {
+		repo: repo,
+	}
+}
+
+func (s Service) Register(ctx context.Context, email, password string) error {
+	bytes, err := bcrypt.GenerateFromPassword([]byte(password), 14)
+	if err != nil {
+		return err
+	}
+
+	if err = s.repo.CreateUser(ctx, email, string(bytes)); err != nil {
+		switch {
+		case errors.Is(err, ErrDuplicateKey):
+			return ErrEmailAlreadyExists
+		default:
+			return err
+		}
+	}
+	
+	return nil
+}
+
+// func (s Service) Login(password string) (string, error) {
+// 	hash, err := s.repo.
+// 	err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
+// }