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0 ? $value : self::DEFAULT_CACHE_TTL; } /** * Resolve a query string (and optional APQ extensions) into a DocumentNode. * * Returns a DocumentNode on success, or a GraphQL-shaped error array on failure. * * @param ?string $query The GraphQL query string (may be null for APQ hash-only requests). * @param array $extensions The request extensions (may contain persistedQuery). * @return DocumentNode|array */ public function resolve( ?string $query, array $extensions ) { $apq = $extensions['persistedQuery'] ?? null; $apq_hash = is_array( $apq ) ? ( $apq['sha256Hash'] ?? null ) : null; if ( Main::is_apq_enabled() && is_array( $apq ) && 1 === ( $apq['version'] ?? null ) && is_string( $apq_hash ) && 1 === preg_match( '/^[a-f0-9]{64}$/', $apq_hash ) ) { return $this->resolve_apq( $query, $apq_hash ); } // Standard query — no APQ. if ( empty( $query ) ) { return $this->error_response( 'No query provided.', 'BAD_REQUEST' ); } // APQ keeps using the cache; it has its own settings toggle. if ( ! $this->is_caching_enabled() ) { return $this->parse( $query ); } $hash = hash( 'sha256', $query ); $doc = $this->get_cached_document( $hash ); if ( false !== $doc ) { return $doc; } return $this->parse_and_cache( $query, $hash ); } /** * Handle an APQ request (hash present in extensions). * * @param ?string $query The query string, if provided. * @param string $apq_hash The sha256 hash from the persistedQuery extension. * @return DocumentNode|array */ private function resolve_apq( ?string $query, string $apq_hash ) { if ( ! empty( $query ) ) { // Registration: query + hash provided. if ( hash( 'sha256', $query ) !== $apq_hash ) { return $this->error_response( 'provided sha does not match query', 'PERSISTED_QUERY_HASH_MISMATCH' ); } $doc = $this->get_cached_document( $apq_hash, true ); if ( false !== $doc ) { return $doc; } return $this->parse_and_cache( $query, $apq_hash, true ); } // Hash-only lookup. $doc = $this->get_cached_document( $apq_hash, true ); if ( false !== $doc ) { return $doc; } return $this->error_response( 'PersistedQueryNotFound', 'PERSISTED_QUERY_NOT_FOUND' ); } /** * Whether at least one cache backend is enabled (and, for OPcache, usable). * * Used to short-circuit the standard-query path when neither backend is * available, so the request is parsed once with no cache lookup overhead. */ private function is_caching_enabled(): bool { return ( Main::is_opcache_enabled() && $this->is_opcache_usable() ) || Main::is_object_cache_enabled(); } /** * Retrieve a cached DocumentNode by hash. * * Tries OPcache first when enabled and usable, then falls back to the * WP object cache. APQ requests pass $for_apq=true so the object cache * is consulted regardless of the standard-query toggle, matching the * pre-OPcache behaviour where APQ always persisted via the object cache. * * @param string $hash The SHA-256 hash. * @param bool $for_apq Whether the lookup is for an APQ request. * @return DocumentNode|false */ private function get_cached_document( string $hash, bool $for_apq = false ) { if ( Main::is_opcache_enabled() && $this->is_opcache_usable() ) { $doc = $this->read_from_opcache( $hash ); if ( false !== $doc ) { return $doc; } } if ( $for_apq || Main::is_object_cache_enabled() ) { $cached = wp_cache_get( $this->build_cache_key( $hash ), self::CACHE_GROUP ); if ( is_array( $cached ) ) { try { return AST::fromArray( $cached ); } catch ( \Throwable $e ) { return false; } } } return false; } /** * Parse a query and return the DocumentNode, or a GraphQL-shaped error * array if the query has a syntax error. * * @param string $query The GraphQL query string. * @return DocumentNode|array */ private function parse( string $query ) { try { return Parser::parse( $query, array( 'noLocation' => true ) ); } catch ( \Automattic\WooCommerce\Vendor\GraphQL\Error\SyntaxError $e ) { return $this->error_response( 'GraphQL syntax error: ' . $e->getMessage(), 'GRAPHQL_PARSE_ERROR' ); } } /** * Parse a query, cache the resulting AST, and return the DocumentNode. * * Writes to OPcache when enabled and usable. APQ registrations always * also write to the object cache so hash-only lookups still resolve if * OPcache later becomes unavailable (toggle off, dir unwritable, files * cleaned up, or a silent write_to_opcache failure). * * Returns an error array if the query has a syntax error. * * @param string $query The GraphQL query string. * @param string $hash The SHA-256 hash to cache under. * @param bool $for_apq Whether the request is an APQ registration. * @return DocumentNode|array */ private function parse_and_cache( string $query, string $hash, bool $for_apq = false ) { $document = $this->parse( $query ); if ( ! $document instanceof DocumentNode ) { return $document; } $used_opcache = Main::is_opcache_enabled() && $this->is_opcache_usable(); if ( $used_opcache ) { $this->write_to_opcache( $hash, $document ); } if ( $for_apq || ( Main::is_object_cache_enabled() && ! $used_opcache ) ) { wp_cache_set( $this->build_cache_key( $hash ), $document->toArray(), self::CACHE_GROUP, self::get_cache_ttl() ); } return $document; } /** * Build a versioned cache key from a hash. * * @param string $hash The SHA-256 hash. * @return string */ private function build_cache_key( string $hash ): string { return self::CACHE_KEY_PREFIX . $hash; } /** * Whether the OPcache file backend can be used for this request. * * Memoised per request: the underlying checks (opcache_get_status, * filesystem writability) don't change mid-request and are wasteful * to repeat across the read and write paths. */ private function is_opcache_usable(): bool { if ( null !== $this->opcache_usable ) { return $this->opcache_usable; } $this->opcache_usable = $this->compute_is_opcache_usable(); return $this->opcache_usable; } /** * Underlying capability check for the OPcache file backend. * * Requires the OPcache extension to be loaded and enabled, and the cache * directory to exist (or be creatable) and be writable. */ private function compute_is_opcache_usable(): bool { if ( ! function_exists( 'opcache_get_status' ) || ! ini_get( 'opcache.enable' ) ) { return false; } // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- opcache.restrict_api raises E_WARNING when the calling path is disallowed; the false return is handled below. $status = @opcache_get_status( false ); if ( ! is_array( $status ) || empty( $status['opcache_enabled'] ) ) { return false; } return $this->ensure_opcache_dir_writable(); } /** * Resolve the directory where OPcache cache files are written. * * Defaults to a versioned subdirectory under wp-uploads so it inherits * the writability guarantees WordPress places on uploads. Filterable * for tests and unusual hosting layouts. * * @internal Public for {@see OpcacheFileExpiry}; not part of the plugin's external API. */ public static function get_opcache_cache_dir(): string { $upload_dir = wp_get_upload_dir(); $default = trailingslashit( $upload_dir['basedir'] ) . self::OPCACHE_DIR_RELATIVE; /** * Filters the directory where parsed GraphQL ASTs are written for OPcache. * * @since 10.9.0 * * @param string $dir Default cache directory under wp-uploads. */ $dir = (string) apply_filters( 'woocommerce_graphql_opcache_cache_dir', $default ); // Reject stream wrappers (e.g. phar://, http://) to keep file_put_contents, // rename, and include constrained to local filesystem paths. if ( '' === $dir || wp_is_stream( $dir ) ) { return ''; } return $dir; } /** * Ensure the OPcache cache directory exists and is writable. * * Creates the directory on first use and drops a deny-all .htaccess and * an empty index.html alongside it. Returns false if creation fails or * the directory ends up non-writable. */ private function ensure_opcache_dir_writable(): bool { $dir = self::get_opcache_cache_dir(); if ( '' === $dir ) { return false; } if ( ! is_dir( $dir ) && ! wp_mkdir_p( $dir ) ) { return false; } $fs = ResolverHelpers::wp_filesystem(); if ( ! $fs || ! $fs->is_writable( $dir ) ) { return false; } // Best-effort hardening; ignore failures (e.g. read-only permissions). $htaccess = $dir . '/.htaccess'; $index = $dir . '/index.html'; if ( ! file_exists( $htaccess ) ) { $fs->put_contents( $htaccess, "Deny from all\n" ); } if ( ! file_exists( $index ) ) { $fs->put_contents( $index, '' ); } return true; } /** * Read a cached DocumentNode from the OPcache file backend. * * @param string $hash The SHA-256 hash. * @return DocumentNode|false */ private function read_from_opcache( string $hash ) { $path = self::get_opcache_cache_dir() . '/' . $hash . '.php'; if ( ! is_file( $path ) ) { return false; } // File contents are produced by self::write_to_opcache() and only // ever return a primitive array. The caller falls back to parsing // when the include returns a non-array. $data = include $path; if ( ! is_array( $data ) ) { return false; } try { return AST::fromArray( $data ); } catch ( \Throwable $e ) { return false; } finally { OpcacheFileExpiry::ensure_scheduled(); } } /** * Persist a parsed AST to the OPcache file backend. * * Writes atomically (temp file + rename) so concurrent readers never see * a partial file, and explicitly invalidates OPcache for the destination * path so installs running with opcache.validate_timestamps=0 still see * the new version. * * Failures are intentionally silent: the caller already holds a valid * DocumentNode, and a failed cache write only forfeits the optimisation * for one request. * * @param string $hash The SHA-256 hash to cache under. * @param DocumentNode $document The parsed AST. */ private function write_to_opcache( string $hash, DocumentNode $document ): void { $dir = self::get_opcache_cache_dir(); $path = $dir . '/' . $hash . '.php'; $tmp = $path . '.' . bin2hex( random_bytes( 8 ) ) . '.tmp'; $contents = "toArray(), true ) . ";\n"; // phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_var_export // phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_file_put_contents if ( false === file_put_contents( $tmp, $contents, LOCK_EX ) ) { return; } $fs = ResolverHelpers::wp_filesystem(); if ( ! $fs || ! $fs->move( $tmp, $path, true ) ) { if ( $fs ) { $fs->delete( $tmp ); } return; } if ( function_exists( 'opcache_invalidate' ) ) { opcache_invalidate( $path, true ); } if ( function_exists( 'opcache_compile_file' ) ) { // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged @opcache_compile_file( $path ); } OpcacheFileExpiry::ensure_scheduled(); } /** * Build a GraphQL-shaped error response array. * * @param string $message The error message. * @param string $code The error code for extensions. * @return array */ private function error_response( string $message, string $code ): array { return array( 'errors' => array( array( 'message' => $message, 'extensions' => array( 'code' => $code ), ), ), ); } }