Release v0.20: регистрация, авторизация, личный кабинет

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

internal/repository/sessions.go

@@ -0,0 +1,44 @@
+package repository
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+type SessionRepository struct {
+	pool *pgxpool.Pool
+}
+
+func NewSessionRepository(pool *pgxpool.Pool) *SessionRepository {
+	return &SessionRepository{pool: pool}
+}
+
+func (r *SessionRepository) Create(ctx context.Context, token string, userID int, expires time.Time) error {
+	_, err := r.pool.Exec(ctx, `
+		INSERT INTO sessions (id, user_id, expires_at) VALUES ($1, $2, $3)`,
+		token, userID, expires)
+	return err
+}
+
+func (r *SessionRepository) UserID(ctx context.Context, token string) (int, error) {
+	var userID int
+	err := r.pool.QueryRow(ctx, `
+		SELECT user_id FROM sessions
+		WHERE id = $1 AND expires_at > NOW()`, token).Scan(&userID)
+	if errors.Is(err, pgx.ErrNoRows) {
+		return 0, nil
+	}
+	if err != nil {
+		return 0, err
+	}
+	return userID, nil
+}
+
+func (r *SessionRepository) Delete(ctx context.Context, token string) error {
+	_, err := r.pool.Exec(ctx, `DELETE FROM sessions WHERE id = $1`, token)
+	return err
+}