Release v0.20: регистрация, авторизация, личный кабинет

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/repository/users.go

@@ -0,0 +1,80 @@
+package repository
+
+import (
+	"context"
+	"errors"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgconn"
+	"github.com/jackc/pgx/v5/pgxpool"
+
+	"shop/internal/models"
+)
+
+type UserRepository struct {
+	pool *pgxpool.Pool
+}
+
+func NewUserRepository(pool *pgxpool.Pool) *UserRepository {
+	return &UserRepository{pool: pool}
+}
+
+func (r *UserRepository) Create(ctx context.Context, email, passwordHash, name string) (*models.User, error) {
+	var u models.User
+	err := r.pool.QueryRow(ctx, `
+		INSERT INTO users (email, password_hash, name)
+		VALUES ($1, $2, $3)
+		RETURNING id, email, name, created_at`,
+		email, passwordHash, name,
+	).Scan(&u.ID, &u.Email, &u.Name, &u.CreatedAt)
+	if err != nil {
+		return nil, err
+	}
+	return &u, nil
+}
+
+func (r *UserRepository) ByID(ctx context.Context, id int) (*models.User, error) {
+	var u models.User
+	err := r.pool.QueryRow(ctx, `
+		SELECT id, email, name, created_at FROM users WHERE id = $1`, id,
+	).Scan(&u.ID, &u.Email, &u.Name, &u.CreatedAt)
+	if errors.Is(err, pgx.ErrNoRows) {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &u, nil
+}
+
+func (r *UserRepository) ByEmailWithHash(ctx context.Context, email string) (*models.User, string, error) {
+	var u models.User
+	var hash string
+	err := r.pool.QueryRow(ctx, `
+		SELECT id, email, name, created_at, password_hash
+		FROM users WHERE email = $1`, email,
+	).Scan(&u.ID, &u.Email, &u.Name, &u.CreatedAt, &hash)
+	if errors.Is(err, pgx.ErrNoRows) {
+		return nil, "", nil
+	}
+	if err != nil {
+		return nil, "", err
+	}
+	return &u, hash, nil
+}
+
+func (r *UserRepository) UpdateName(ctx context.Context, userID int, name string) error {
+	_, err := r.pool.Exec(ctx, `UPDATE users SET name = $1 WHERE id = $2`, name, userID)
+	return err
+}
+
+func (r *UserRepository) Count(ctx context.Context) (int, error) {
+	var n int
+	err := r.pool.QueryRow(ctx, `SELECT COUNT(*) FROM users`).Scan(&n)
+	return n, err
+}
+
+func IsUniqueViolation(err error) bool {
+	var pgErr *pgconn.PgError
+	return errors.As(err, &pgErr) && pgErr.Code == "23505"
+}