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= 0 && $requested <= \Automattic\WooCommerce\Api\Pagination\PaginationParams::MAX_PAGE_SIZE ) ? $requested : \Automattic\WooCommerce\Api\Pagination\PaginationParams::MAX_PAGE_SIZE; return $page_size * ( $child_complexity + 1 ); } /** * Build a PaginationParams instance from the standard GraphQL pagination * arguments (first, last, after, before). * * @param array $args The GraphQL field arguments. * * @return \Automattic\WooCommerce\Api\Pagination\PaginationParams * @throws Error When a pagination value is out of range. */ public static function create_pagination_params( array $args ): \Automattic\WooCommerce\Api\Pagination\PaginationParams { return self::create_input( fn() => new \Automattic\WooCommerce\Api\Pagination\PaginationParams( first: $args['first'] ?? null, last: $args['last'] ?? null, after: $args['after'] ?? null, before: $args['before'] ?? null, ) ); } /** * Invoke a factory callable, catching InvalidArgumentException and * converting it to a client-visible GraphQL error. * * Used to wrap construction of unrolled input types (PaginationParams, * ProductFilterInput, etc.) whose constructors may validate their * arguments and throw. * * @param callable $factory A callable that returns the constructed object. * * @return mixed The return value of the factory. * @throws Error When the factory throws InvalidArgumentException. */ public static function create_input( callable $factory ): mixed { // phpcs:disable WordPress.Security.EscapeOutput.ExceptionNotEscaped -- Not HTML; serialized as JSON. try { return $factory(); } catch ( \InvalidArgumentException $e ) { throw new Error( $e->getMessage(), extensions: array( 'code' => 'INVALID_ARGUMENT' ) ); } // phpcs:enable WordPress.Security.EscapeOutput.ExceptionNotEscaped } /** * Execute a command's execute() method, translating any thrown exceptions * into spec-compliant GraphQL errors. * * @param object $command The command instance (must have an execute() method). * @param array $execute_args Named arguments to pass to execute(). * * @return mixed The return value of execute(). * @throws Error On any exception from the command. */ public static function execute_command( object $command, array $execute_args ): mixed { return self::translate_exceptions( static fn() => $command->execute( ...$execute_args ) ); } /** * Invoke a command's authorize() method, translating any thrown exceptions * into spec-compliant GraphQL errors. * * Mirror of execute_command() for the authorize step. Needed because an * authorize() call can throw an ApiException (e.g. UnauthorizedException * when a target record does not exist); without this wrapper the * exception would propagate up to the engine and lose its error code and * user-visible message on its way through the generic error formatter. * * @param object $command The command instance (must have an authorize() method). * @param array $authorize_args Named arguments to pass to authorize(). * * @return bool The return value of authorize(). * @throws Error On any exception from the authorize method. */ public static function authorize_command( object $command, array $authorize_args ): bool { return self::translate_exceptions( static fn() => $command->authorize( ...$authorize_args ) ); } /** * Build the GraphQL error to throw when an authorization check fails. * * Distinguishes the two HTTP-correct shapes: * - **UNAUTHORIZED (401)** when the principal is anonymous — the caller * could plausibly fix it by authenticating, so the response invites * re-auth. * - **FORBIDDEN (403)** otherwise — the principal is recognised but * isn't allowed; re-authenticating wouldn't help. * * The "anonymous" check is opt-in by convention: the principal's * `is_authenticated(): bool` method, when present, decides. Principals * that don't define it fall through to FORBIDDEN — generated resolvers * still emit a coded error, just without the 401/403 distinction. * * Used for class-level denials (operation-level "you cannot call this * query/mutation"). For field-level denials that should carry a * structured `subject` payload (type / field / attribute), see * {@see self::build_field_authorization_error()}. * * @param object $principal The resolved request principal. */ public static function build_authorization_error( object $principal ): Error { $is_anonymous = method_exists( $principal, 'is_authenticated' ) && ! $principal->is_authenticated(); return new Error( $is_anonymous ? 'Authentication required.' : 'You do not have permission to perform this action.', extensions: array( 'code' => $is_anonymous ? 'UNAUTHORIZED' : 'FORBIDDEN' ) ); } /** * Like {@see self::build_authorization_error()} but carries a structured * `subject` payload identifying *what* was denied — the enclosing type, * the field (when applicable), and the attribute class name driving the * decision. Clients can branch on `extensions.subject.field` to tell a * field-level deny apart from an operation-level one. * * The error code (UNAUTHORIZED / FORBIDDEN) is preserved verbatim so * existing client handlers continue to work; the subject payload is * additive. * * @param object $principal The resolved request principal. * @param string $type GraphQL type name carrying the gate. * @param ?string $field Field name when the deny is field-level; null for type/operation-level denies. * @param string $attribute_short Short class name of the deciding authorization attribute (no namespace). */ public static function build_field_authorization_error( object $principal, string $type, ?string $field, string $attribute_short ): Error { $is_anonymous = method_exists( $principal, 'is_authenticated' ) && ! $principal->is_authenticated(); $subject = array( 'type' => $type, 'attribute' => $attribute_short, ); if ( null !== $field ) { $subject['field'] = $field; } return new Error( $is_anonymous ? 'Authentication required.' : 'You do not have permission to perform this action.', extensions: array( 'code' => $is_anonymous ? 'UNAUTHORIZED' : 'FORBIDDEN', 'subject' => $subject, ) ); } /** * Compute the value `_preauthorized` would carry for the given command and * principal (the AND of the autodiscovered authorization attributes' * authorize() outcomes). * * Lets code-API callers (and tests) ask "would this command's attribute-based * authorization grant access to this principal?" without going through the * GraphQL pipeline. * * Note that it returns true when the command has no authorization attributes * (in that case the command's own `authorize()` method, if any, is the sole * guard; and consulting it requires running the command, which this helper * deliberately doesn't do). * * Note: this provides the attribute-level authorization only. A command with * both attributes and an `authorize()` method composes the two via the * `_preauthorized` infrastructure parameter; this helper returns the value * that `_preauthorized` would carry, not the final `authorize()` outcome. * * Scope is class-level (queries / mutations). Field-level authorization * lives on output-type / input-type properties and is enforced inside * the generated resolvers. To inspect a field's declared authorization * from code, walk {@see \Automattic\WooCommerce\Api\Utils\SchemaHandle::find_metadata()} * and read the `authorization` slice on each row. * * @param string $command_fqcn Fully-qualified command class name. * @param object $principal The resolved principal. Anonymous requests are represented by a sentinel principal (e.g. {@see \Automattic\WooCommerce\Api\Infrastructure\Principal} whose underlying WP_User has ID=0), not by null. * * @throws \InvalidArgumentException When `$command_fqcn` does not name an existing class. */ public static function compute_preauthorized( string $command_fqcn, object $principal ): bool { if ( ! class_exists( $command_fqcn ) ) { throw new \InvalidArgumentException( sprintf( 'Class %s does not exist.', esc_html( $command_fqcn ) ) ); } $ref = new \ReflectionClass( $command_fqcn ); $direct = self::collect_authorization_instances( $ref ); $usages = $direct; if ( empty( $usages ) ) { // No direct attribute — collect from the entire ancestor tree: // the parent chain plus each ancestor's traits and interfaces // (recursively). All inherited sources contribute as peers; the // only thing direct attributes shadow is the inherited tree as a // whole. Mirrors // {@see \Automattic\WooCommerce\Api\Infrastructure\DesignTime\ApiBuilder::resolve_authorization()}. $visited = array(); $stack = array_merge( $ref->getParentClass() ? array( $ref->getParentClass() ) : array(), $ref->getTraits(), $ref->getInterfaces(), ); while ( ! empty( $stack ) ) { $source = array_shift( $stack ); $name = $source->getName(); if ( in_array( $name, $visited, true ) ) { continue; } $visited[] = $name; $usages = array_merge( $usages, self::collect_authorization_instances( $source ) ); if ( false !== $source->getParentClass() ) { $stack[] = $source->getParentClass(); } $stack = array_merge( $stack, $source->getTraits(), $source->getInterfaces() ); } } $query_metadata = self::harvest_class_metadata( $ref ); foreach ( $usages as $instance ) { $auth_method = new \ReflectionMethod( $instance, 'authorize' ); $call_args = self::build_authorize_call_args( $auth_method, $principal, array( 'query' => $query_metadata ), array(), null ); $result = $instance->authorize( ...$call_args ); if ( ! $result ) { return false; } } return true; } /** * Mirror of `ApiBuilder::harvest_metadata()` for the runtime path. Walks * {@see \Automattic\WooCommerce\Api\Attributes\Metadata}-subclass attributes * on a class reflector and returns `name => value`. Duplicate names are * resolved last-wins — the build-time validator already errors on * duplicates, so this is only relevant for in-process classes that * never went through a build. * * The per-target `_apiMetadata` opt-out (`shows_in_metadata_query()`) * is not applied here: the `$_metadata` slot threaded into a class- * level attribute's `authorize()` is for policy input, not discovery, * so attribute authors see every entry regardless of how it surfaces * through `_apiMetadata`. * * @param \ReflectionClass $ref The class to read metadata from. * @return array */ private static function harvest_class_metadata( \ReflectionClass $ref ): array { $entries = array(); foreach ( $ref->getAttributes( \Automattic\WooCommerce\Api\Attributes\Metadata::class, \ReflectionAttribute::IS_INSTANCEOF ) as $attribute ) { $instance = $attribute->newInstance(); $entries[ $instance->get_name() ] = $instance->get_value(); } return $entries; } /** * Build the positional/named argument list for an attribute's `authorize()` * method based on which opt-in slots its signature declares. * * The principal is always passed first (positionally) when the method * declares a non-`_`-prefixed parameter; infrastructure parameters * (`$_metadata`, `$_args`, `$_parent`) are passed as named arguments so * the attribute can omit any subset without affecting the call shape. * * @param \ReflectionMethod $method The attribute's `authorize()` method. * @param object $principal The resolved principal to pass when the method takes one. * @param array $metadata Value for `$_metadata` (passed if the method declares it). * @param array $args Value for `$_args` (passed if the method declares it). * @param mixed $parent Value for `$_parent` (passed if the method declares it). * * @return array Positional principal first (if any), then named infra slots. Use with `...` spread. */ private static function build_authorize_call_args( \ReflectionMethod $method, object $principal, array $metadata, array $args, mixed $parent ): array { $call_args = array(); foreach ( $method->getParameters() as $param ) { $name = $param->getName(); if ( '_metadata' === $name ) { $call_args['_metadata'] = $metadata; } elseif ( '_args' === $name ) { $call_args['_args'] = $args; } elseif ( '_parent' === $name ) { $call_args['_parent'] = $parent; } elseif ( '' === $name || '_' !== $name[0] ) { // Principal — positional, must be the first entry in the spread. array_unshift( $call_args, $principal ); } } return $call_args; } /** * Collect attribute instances declared on $source whose class declares an * authorization-shaped `authorize()` method. * * Mirrors {@see \Automattic\WooCommerce\Api\Infrastructure\DesignTime\ApiBuilder::collect_authorization_usages()} * for the runtime path: same direct-then-inherited precedence, same * "any class with a bool-returning authorize() method qualifies" rule. * * @param \ReflectionClass $source Class/trait/interface to read attributes from. * * @return array */ private static function collect_authorization_instances( \ReflectionClass $source ): array { $instances = array(); foreach ( $source->getAttributes() as $attr ) { $name = $attr->getName(); if ( ! class_exists( $name ) || ! method_exists( $name, 'authorize' ) ) { continue; } $method = new \ReflectionMethod( $name, 'authorize' ); if ( ! self::authorize_method_shape_is_valid( $method ) ) { continue; } $instances[] = $attr->newInstance(); } return $instances; } /** * Whether a method's shape matches the authorization-attribute contract: * public, non-static, returns bool, and parameters drawn from the accepted * set — at most one principal (any non-`_`-prefixed name, non-nullable * typed) plus any subset of `$_metadata` (array), `$_args` (array), and * `$_parent` (any type). * * Mirrors the build-time `ApiBuilder::validate_attribute_authorize_shape()` * check so the runtime helper recognises the same set of attributes ApiBuilder * would have emitted into a resolver. * * @param \ReflectionMethod $method The method to inspect. */ private static function authorize_method_shape_is_valid( \ReflectionMethod $method ): bool { if ( $method->isStatic() || ! $method->isPublic() ) { return false; } $return_type = $method->getReturnType(); if ( ! $return_type instanceof \ReflectionNamedType || 'bool' !== $return_type->getName() ) { return false; } $principal_seen = false; foreach ( $method->getParameters() as $param ) { $name = $param->getName(); if ( '_metadata' === $name || '_args' === $name ) { $type = $param->getType(); if ( ! $type instanceof \ReflectionNamedType || 'array' !== $type->getName() ) { return false; } continue; } if ( '_parent' === $name ) { continue; } if ( '' !== $name && '_' === $name[0] ) { // Unknown infra parameter — reject. return false; } if ( $principal_seen ) { return false; } $type = $param->getType(); if ( ! $type instanceof \ReflectionNamedType || $type->allowsNull() ) { return false; } $principal_seen = true; } return true; } /** * Invoke a callable, translating any thrown exception into a * spec-compliant GraphQL error with a machine-readable code. * * - ApiException → its own code + extensions, with the original message. * - InvalidArgumentException → INVALID_ARGUMENT, with the original message. * - Any other Throwable → INTERNAL_ERROR, with a generic message; the * original throwable is attached as `previous` for debug-mode surfacing. * * Public so that generated resolvers can wrap Code-API calls that happen * outside the execute()/authorize() pair (e.g. the Connection::slice() * call emitted for nested paginated connection fields, which can throw * InvalidArgumentException when pagination bounds are exceeded). * * @param callable $operation Callable to invoke. * * @return mixed The return value of the callable. * @throws Error On any exception from the callable. */ public static function translate_exceptions( callable $operation ): mixed { // phpcs:disable WordPress.Security.EscapeOutput.ExceptionNotEscaped -- Not HTML; serialized as JSON. try { return $operation(); } catch ( \Automattic\WooCommerce\Api\ApiException $e ) { // Caller-supplied extensions come first so the canonical // getErrorCode() can't be silently overridden by an extensions // entry keyed 'code'. The invariant "the code on the wire // equals ApiException::getErrorCode()" is worth enforcing. throw new Error( $e->getMessage(), extensions: array_merge( $e->getExtensions(), array( 'code' => $e->getErrorCode() ) ) ); } catch ( \InvalidArgumentException $e ) { throw new Error( $e->getMessage(), extensions: array( 'code' => 'INVALID_ARGUMENT' ) ); } catch ( \Throwable $e ) { throw new Error( 'An unexpected error occurred.', previous: $e, extensions: array( 'code' => 'INTERNAL_ERROR' ) ); }//end try // phpcs:enable WordPress.Security.EscapeOutput.ExceptionNotEscaped } /** * Lazy-initialize and return the WP_Filesystem global, or null when the * direct method isn't available (e.g. credentials prompt would be needed). */ public static function wp_filesystem(): ?\WP_Filesystem_Base { global $wp_filesystem; if ( ! $wp_filesystem ) { require_once ABSPATH . 'wp-admin/includes/file.php'; if ( ! WP_Filesystem() ) { return null; } } return $wp_filesystem; } }