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<?php
/**
* Abilities API
*
* Defines WP_Abilities_Registry class.
*
* @package WordPress
* @subpackage Abilities API
* @since 6.9.0
*/
declare( strict_types = 1 );
/**
* Manages the registration and lookup of abilities.
*
* @since 6.9.0
* @access private
*/
final class WP_Abilities_Registry {
/**
* The singleton instance of the registry.
*
* @since 6.9.0
* @var self|null
*/
private static $instance = null;
/**
* Holds the registered abilities.
*
* @since 6.9.0
* @var WP_Ability[]
*/
private $registered_abilities = array();
/**
* Registers a new ability.
*
* Do not use this method directly. Instead, use the `wp_register_ability()` function.
*
* @since 6.9.0
*
* @see wp_register_ability()
*
* @param string $name The name of the ability. The name must be a string containing a namespace
* prefix, i.e. `my-plugin/my-ability`. It can only contain lowercase
* alphanumeric characters, dashes and the forward slash.
* @param array<string, mixed> $args {
* An associative array of arguments for the ability.
*
* @type string $label The human-readable label for the ability.
* @type string $description A detailed description of what the ability does.
* @type string $category The ability category slug this ability belongs to.
* @type callable $execute_callback A callback function to execute when the ability is invoked.
* Receives optional mixed input and returns mixed result or WP_Error.
* @type callable $permission_callback A callback function to check permissions before execution.
* Receives optional mixed input and returns bool or WP_Error.
* @type array<string, mixed> $input_schema Optional. JSON Schema definition for the ability's input.
* @type array<string, mixed> $output_schema Optional. JSON Schema definition for the ability's output.
* @type array<string, mixed> $meta {
* Optional. Additional metadata for the ability.
*
* @type array<string, bool|null> $annotations {
* Optional. Semantic annotations describing the ability's behavioral characteristics.
* These annotations are hints for tooling and documentation.
*
* @type bool|null $readonly Optional. If true, the ability does not modify its environment.
* @type bool|null $destructive Optional. If true, the ability may perform destructive updates to its environment.
* If false, the ability performs only additive updates.
* @type bool|null $idempotent Optional. If true, calling the ability repeatedly with the same arguments
* will have no additional effect on its environment.
* }
* @type bool $show_in_rest Optional. Whether to expose this ability in the REST API. Default false.
* }
* @type string $ability_class Optional. Custom class to instantiate instead of WP_Ability.
* }
* @return WP_Ability|null The registered ability instance on success, null on failure.
*/
public function register( string $name, array $args ): ?WP_Ability {
if ( ! preg_match( '/^[a-z0-9-]+\/[a-z0-9-]+$/', $name ) ) {
_doing_it_wrong(
__METHOD__,
__(
'Ability name must be a string containing a namespace prefix, i.e. "my-plugin/my-ability". It can only contain lowercase alphanumeric characters, dashes and the forward slash.'
),
'6.9.0'
);
return null;
}
if ( $this->is_registered( $name ) ) {
_doing_it_wrong(
__METHOD__,
/* translators: %s: Ability name. */
sprintf( __( 'Ability "%s" is already registered.' ), esc_html( $name ) ),
'6.9.0'
);
return null;
}
/**
* Filters the ability arguments before they are validated and used to instantiate the ability.
*
* @since 6.9.0
*
* @param array<string, mixed> $args {
* An associative array of arguments for the ability.
*
* @type string $label The human-readable label for the ability.
* @type string $description A detailed description of what the ability does.
* @type string $category The ability category slug this ability belongs to.
* @type callable $execute_callback A callback function to execute when the ability is invoked.
* Receives optional mixed input and returns mixed result or WP_Error.
* @type callable $permission_callback A callback function to check permissions before execution.
* Receives optional mixed input and returns bool or WP_Error.
* @type array<string, mixed> $input_schema Optional. JSON Schema definition for the ability's input.
* @type array<string, mixed> $output_schema Optional. JSON Schema definition for the ability's output.
* @type array<string, mixed> $meta {
* Optional. Additional metadata for the ability.
*
* @type array<string, bool|string> $annotations Optional. Annotation metadata for the ability.
* @type bool $show_in_rest Optional. Whether to expose this ability in the REST API. Default false.
* }
* @type string $ability_class Optional. Custom class to instantiate instead of WP_Ability.
* }
* @param string $name The name of the ability, with its namespace.
*/
$args = apply_filters( 'wp_register_ability_args', $args, $name );
// Validate ability category exists if provided (will be validated as required in WP_Ability).
if ( isset( $args['category'] ) ) {
if ( ! wp_has_ability_category( $args['category'] ) ) {
_doing_it_wrong(
__METHOD__,
sprintf(
/* translators: %1$s: ability category slug, %2$s: ability name */
__( 'Ability category "%1$s" is not registered. Please register the ability category before assigning it to ability "%2$s".' ),
esc_html( $args['category'] ),
esc_html( $name )
),
'6.9.0'
);
return null;
}
}
// The class is only used to instantiate the ability, and is not a property of the ability itself.
if ( isset( $args['ability_class'] ) && ! is_a( $args['ability_class'], WP_Ability::class, true ) ) {
_doing_it_wrong(
__METHOD__,
__( 'The ability args should provide a valid `ability_class` that extends WP_Ability.' ),
'6.9.0'
);
return null;
}
/** @var class-string<WP_Ability> */
$ability_class = $args['ability_class'] ?? WP_Ability::class;
unset( $args['ability_class'] );
try {
// WP_Ability::prepare_properties() will throw an exception if the properties are invalid.
$ability = new $ability_class( $name, $args );
} catch ( InvalidArgumentException $e ) {
_doing_it_wrong(
__METHOD__,
$e->getMessage(),
'6.9.0'
);
return null;
}
$this->registered_abilities[ $name ] = $ability;
return $ability;
}
/**
* Unregisters an ability.
*
* Do not use this method directly. Instead, use the `wp_unregister_ability()` function.
*
* @since 6.9.0
*
* @see wp_unregister_ability()
*
* @param string $name The name of the registered ability, with its namespace.
* @return WP_Ability|null The unregistered ability instance on success, null on failure.
*/
public function unregister( string $name ): ?WP_Ability {
if ( ! $this->is_registered( $name ) ) {
_doing_it_wrong(
__METHOD__,
/* translators: %s: Ability name. */
sprintf( __( 'Ability "%s" not found.' ), esc_html( $name ) ),
'6.9.0'
);
return null;
}
$unregistered_ability = $this->registered_abilities[ $name ];
unset( $this->registered_abilities[ $name ] );
return $unregistered_ability;
}
/**
* Retrieves the list of all registered abilities.
*
* Do not use this method directly. Instead, use the `wp_get_abilities()` function.
*
* @since 6.9.0
*
* @see wp_get_abilities()
*
* @return WP_Ability[] The array of registered abilities.
*/
public function get_all_registered(): array {
return $this->registered_abilities;
}
/**
* Checks if an ability is registered.
*
* Do not use this method directly. Instead, use the `wp_has_ability()` function.
*
* @since 6.9.0
*
* @see wp_has_ability()
*
* @param string $name The name of the registered ability, with its namespace.
* @return bool True if the ability is registered, false otherwise.
*/
public function is_registered( string $name ): bool {
return isset( $this->registered_abilities[ $name ] );
}
/**
* Retrieves a registered ability.
*
* Do not use this method directly. Instead, use the `wp_get_ability()` function.
*
* @since 6.9.0
*
* @see wp_get_ability()
*
* @param string $name The name of the registered ability, with its namespace.
* @return WP_Ability|null The registered ability instance, or null if it is not registered.
*/
public function get_registered( string $name ): ?WP_Ability {
if ( ! $this->is_registered( $name ) ) {
_doing_it_wrong(
__METHOD__,
/* translators: %s: Ability name. */
sprintf( __( 'Ability "%s" not found.' ), esc_html( $name ) ),
'6.9.0'
);
return null;
}
return $this->registered_abilities[ $name ];
}
/**
* Utility method to retrieve the main instance of the registry class.
*
* The instance will be created if it does not exist yet.
*
* @since 6.9.0
*
* @return WP_Abilities_Registry|null The main registry instance, or null when `init` action has not fired.
*/
public static function get_instance(): ?self {
if ( ! did_action( 'init' ) ) {
_doing_it_wrong(
__METHOD__,
sprintf(
// translators: %s: init action.
__( 'Ability API should not be initialized before the %s action has fired.' ),
'<code>init</code>'
),
'6.9.0'
);
return null;
}
if ( null === self::$instance ) {
self::$instance = new self();
// Ensure ability category registry is initialized first to allow categories to be registered
// before abilities that depend on them.
WP_Ability_Categories_Registry::get_instance();
/**
* Fires when preparing abilities registry.
*
* Abilities should be created and register their hooks on this action rather
* than another action to ensure they're only loaded when needed.
*
* @since 6.9.0
*
* @param WP_Abilities_Registry $instance Abilities registry object.
*/
do_action( 'wp_abilities_api_init', self::$instance );
}
return self::$instance;
}
/**
* Wakeup magic method.
*
* @since 6.9.0
* @throws LogicException If the registry object is unserialized.
* This is a security hardening measure to prevent unserialization of the registry.
*/
public function __wakeup(): void {
throw new LogicException( __CLASS__ . ' should never be unserialized.' );
}
/**
* Sleep magic method.
*
* @since 6.9.0
* @throws LogicException If the registry object is serialized.
* This is a security hardening measure to prevent serialization of the registry.
*/
public function __sleep(): array {
throw new LogicException( __CLASS__ . ' should never be serialized.' );
}
}