Initial commit: VPN panel on Go, PostgreSQL 17, Docker, Xray-core

internal/store/user.go

@@ -0,0 +1,87 @@
+package store
+
+import (
+	"context"
+	"errors"
+
+	"github.com/google/uuid"
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgxpool"
+	"vpn-panel/internal/models"
+)
+
+var ErrAdminExists = errors.New("администратор уже зарегистрирован")
+
+type UserStore struct {
+	pool *pgxpool.Pool
+}
+
+func NewUserStore(pool *pgxpool.Pool) *UserStore {
+	return &UserStore{pool: pool}
+}
+
+func (s *UserStore) HasAdmin(ctx context.Context) (bool, error) {
+	var n int
+	err := s.pool.QueryRow(ctx,
+		`SELECT COUNT(*) FROM users WHERE role = 'admin'`,
+	).Scan(&n)
+	return n > 0, err
+}
+
+func (s *UserStore) CreateAdmin(ctx context.Context, email, passwordHash string) (*models.User, error) {
+	has, err := s.HasAdmin(ctx)
+	if err != nil {
+		return nil, err
+	}
+	if has {
+		return nil, ErrAdminExists
+	}
+
+	var u models.User
+	err = s.pool.QueryRow(ctx, `
+		INSERT INTO users (email, password_hash, role)
+		VALUES ($1, $2, 'admin')
+		RETURNING id, email, password_hash, role, created_at
+	`, email, passwordHash).Scan(
+		&u.ID, &u.Email, &u.PasswordHash, &u.Role, &u.CreatedAt,
+	)
+	if err != nil {
+		return nil, err
+	}
+	return &u, nil
+}
+
+func (s *UserStore) GetByEmail(ctx context.Context, email string) (*models.User, error) {
+	var u models.User
+	err := s.pool.QueryRow(ctx, `
+		SELECT id, email, password_hash, role, created_at
+		FROM users WHERE email = $1
+	`, email).Scan(&u.ID, &u.Email, &u.PasswordHash, &u.Role, &u.CreatedAt)
+	if errors.Is(err, pgx.ErrNoRows) {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &u, nil
+}
+
+func (s *UserStore) CountUsers(ctx context.Context) (int, error) {
+	var n int
+	err := s.pool.QueryRow(ctx, `SELECT COUNT(*) FROM users`).Scan(&n)
+	return n, err
+}
+
+func (s *UserStore) GetAdminID(ctx context.Context) (uuid.UUID, bool, error) {
+	var id uuid.UUID
+	err := s.pool.QueryRow(ctx,
+		`SELECT id FROM users WHERE role = 'admin' LIMIT 1`,
+	).Scan(&id)
+	if errors.Is(err, pgx.ErrNoRows) {
+		return uuid.Nil, false, nil
+	}
+	if err != nil {
+		return uuid.Nil, false, err
+	}
+	return id, true, nil
+}