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package authkeys
import (
"context"
"crypto/rand"
"crypto/sha256"
"crypto/subtle"
"database/sql"
"encoding/base64"
"errors"
"fmt"
"path/filepath"
"time"
_ "modernc.org/sqlite"
)
const schemaSQL = `
CREATE TABLE IF NOT EXISTS client_key (
hostname TEXT NOT NULL PRIMARY KEY,
key_hash BLOB NOT NULL,
created_at INTEGER NOT NULL
);
`
// Store holds per-client API key hashes in SQLite.
type Store struct {
db *sql.DB
}
// DefaultPath returns the default auth database path under statsDir.
func DefaultPath(statsDir string) string {
return filepath.Join(statsDir, "goprecords-auth.db")
}
// OpenStore opens or creates the SQLite auth database at path.
func OpenStore(ctx context.Context, path string) (*Store, error) {
db, err := sql.Open("sqlite", path)
if err != nil {
return nil, fmt.Errorf("open auth db: %w", err)
}
if err := db.PingContext(ctx); err != nil {
db.Close()
return nil, fmt.Errorf("ping auth db: %w", err)
}
if _, err := db.ExecContext(ctx, "PRAGMA foreign_keys = OFF"); err != nil {
db.Close()
return nil, fmt.Errorf("pragma: %w", err)
}
return &Store{db: db}, nil
}
// Close releases the database handle.
func (s *Store) Close() error {
if s == nil || s.db == nil {
return nil
}
return s.db.Close()
}
// EnsureSchema creates the client_key table if missing.
func (s *Store) EnsureSchema(ctx context.Context) error {
_, err := s.db.ExecContext(ctx, schemaSQL)
if err != nil {
return fmt.Errorf("auth schema: %w", err)
}
return nil
}
// KeyCount returns how many client keys are stored. When zero, upload auth is not enforced.
func (s *Store) KeyCount(ctx context.Context) (int, error) {
var n int
err := s.db.QueryRowContext(ctx, "SELECT COUNT(*) FROM client_key").Scan(&n)
if err != nil {
return 0, fmt.Errorf("count keys: %w", err)
}
return n, nil
}
// CreateKey inserts or replaces the key for hostname and returns the plaintext token once.
func (s *Store) CreateKey(ctx context.Context, hostname string) (token string, err error) {
if hostname == "" {
return "", fmt.Errorf("empty hostname")
}
raw := make([]byte, 32)
if _, readErr := rand.Read(raw); readErr != nil {
return "", fmt.Errorf("random token: %w", readErr)
}
tok := base64.RawURLEncoding.EncodeToString(raw)
sum := sha256.Sum256([]byte(tok))
_, err = s.db.ExecContext(ctx,
`INSERT INTO client_key (hostname, key_hash, created_at) VALUES (?, ?, ?)
ON CONFLICT(hostname) DO UPDATE SET key_hash = excluded.key_hash, created_at = excluded.created_at`,
hostname, sum[:], time.Now().Unix(),
)
if err != nil {
return "", fmt.Errorf("insert key: %w", err)
}
return tok, nil
}
// Verify checks that token matches the stored hash for hostname.
func (s *Store) Verify(ctx context.Context, hostname, token string) (bool, error) {
var stored []byte
err := s.db.QueryRowContext(ctx, "SELECT key_hash FROM client_key WHERE hostname = ?", hostname).Scan(&stored)
if errors.Is(err, sql.ErrNoRows) {
return false, nil
}
if err != nil {
return false, fmt.Errorf("lookup key: %w", err)
}
sum := sha256.Sum256([]byte(token))
if len(stored) != len(sum) {
return false, nil
}
return subtle.ConstantTimeCompare(stored, sum[:]) == 1, nil
}
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