615 lines
24 KiB
PHP
615 lines
24 KiB
PHP
<?php
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/**
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* Abilities API: core functions for registering and managing abilities.
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*
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* The Abilities API provides a unified, extensible framework for registering
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* and executing discrete capabilities within WordPress. An "ability" is a
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* self-contained unit of functionality with defined inputs, outputs, permissions,
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* and execution logic.
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*
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* ## Overview
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*
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* The Abilities API enables developers to:
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*
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* - Register custom abilities with standardized interfaces.
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* - Define permission checks and execution callbacks.
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* - Organize abilities into logical categories.
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* - Validate inputs and outputs using JSON Schema.
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* - Expose abilities through the REST API.
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*
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* ## Working with Abilities
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*
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* Abilities must be registered on the `wp_abilities_api_init` action hook.
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* Attempting to register an ability outside of this hook will fail and
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* trigger a `_doing_it_wrong()` notice.
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* Example:
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*
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* function my_plugin_register_abilities(): void {
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* wp_register_ability(
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* 'my-plugin/export-users',
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* array(
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* 'label' => __( 'Export Users', 'my-plugin' ),
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* 'description' => __( 'Exports user data to CSV format.', 'my-plugin' ),
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* 'category' => 'data-export',
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* 'execute_callback' => 'my_plugin_export_users',
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* 'permission_callback' => function(): bool {
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* return current_user_can( 'export' );
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* },
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* 'input_schema' => array(
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* 'type' => 'string',
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* 'enum' => array( 'subscriber', 'contributor', 'author', 'editor', 'administrator' ),
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* 'description' => __( 'Limits the export to users with this role.', 'my-plugin' ),
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* 'required' => false,
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* ),
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* 'output_schema' => array(
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* 'type' => 'string',
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* 'description' => __( 'User data in CSV format.', 'my-plugin' ),
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* 'required' => true,
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* ),
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* 'meta' => array(
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* 'show_in_rest' => true,
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* ),
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* )
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* );
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* }
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* add_action( 'wp_abilities_api_init', 'my_plugin_register_abilities' );
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*
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* Once registered, abilities can be checked, retrieved, and managed:
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*
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* // Checks if an ability is registered, and prints its label.
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* if ( wp_has_ability( 'my-plugin/export-users' ) ) {
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* $ability = wp_get_ability( 'my-plugin/export-users' );
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*
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* echo $ability->get_label();
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* }
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*
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* // Gets all registered abilities.
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* $all_abilities = wp_get_abilities();
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*
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* // Unregisters when no longer needed.
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* wp_unregister_ability( 'my-plugin/export-users' );
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*
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* ## Best Practices
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*
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* - Always register abilities on the `wp_abilities_api_init` hook.
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* - Use namespaced ability names to prevent conflicts.
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* - Implement robust permission checks in permission callbacks.
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* - Provide an `input_schema` to ensure data integrity and document expected inputs.
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* - Define an `output_schema` to describe return values and validate responses.
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* - Return `WP_Error` objects for failures rather than throwing exceptions.
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* - Use internationalization functions for all user-facing strings.
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*
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* @package WordPress
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* @subpackage Abilities_API
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* @since 6.9.0
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*/
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declare( strict_types = 1 );
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/**
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* Registers a new ability using the Abilities API. It requires three steps:
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*
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* 1. Hook into the `wp_abilities_api_init` action.
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* 2. Call `wp_register_ability()` with a namespaced name and configuration.
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* 3. Provide execute and permission callbacks.
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*
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* Example:
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*
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* function my_plugin_register_abilities(): void {
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* wp_register_ability(
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* 'my-plugin/analyze-text',
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* array(
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* 'label' => __( 'Analyze Text', 'my-plugin' ),
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* 'description' => __( 'Performs sentiment analysis on provided text.', 'my-plugin' ),
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* 'category' => 'text-processing',
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* 'input_schema' => array(
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* 'type' => 'string',
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* 'description' => __( 'The text to be analyzed.', 'my-plugin' ),
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* 'minLength' => 10,
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* 'required' => true,
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* ),
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* 'output_schema' => array(
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* 'type' => 'string',
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* 'enum' => array( 'positive', 'negative', 'neutral' ),
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* 'description' => __( 'The sentiment result: positive, negative, or neutral.', 'my-plugin' ),
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* 'required' => true,
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* ),
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* 'execute_callback' => 'my_plugin_analyze_text',
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* 'permission_callback' => 'my_plugin_can_analyze_text',
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* 'meta' => array(
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* 'annotations' => array(
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* 'readonly' => true,
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* ),
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* 'show_in_rest' => true,
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* ),
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* )
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* );
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* }
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* add_action( 'wp_abilities_api_init', 'my_plugin_register_abilities' );
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*
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* ### Naming Conventions
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*
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* Ability names must follow these rules:
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*
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* - Include a namespace prefix (e.g., `my-plugin/my-ability`).
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* - Use only lowercase alphanumeric characters, dashes, and forward slashes.
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* - Use descriptive, action-oriented names (e.g., `process-payment`, `generate-report`).
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*
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* ### Categories
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*
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* Abilities must be organized into categories. Ability categories provide better
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* discoverability and must be registered before the abilities that reference them:
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*
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* function my_plugin_register_categories(): void {
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* wp_register_ability_category(
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* 'text-processing',
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* array(
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* 'label' => __( 'Text Processing', 'my-plugin' ),
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* 'description' => __( 'Abilities for analyzing and transforming text.', 'my-plugin' ),
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* )
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* );
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* }
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* add_action( 'wp_abilities_api_categories_init', 'my_plugin_register_categories' );
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*
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* ### Input and Output Schemas
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*
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* Schemas define the expected structure, type, and constraints for ability inputs
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* and outputs using JSON Schema syntax. They serve two critical purposes: automatic
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* validation of data passed to and returned from abilities, and self-documenting
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* API contracts for developers.
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*
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* WordPress implements a validator based on a subset of the JSON Schema Version 4
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* specification (https://json-schema.org/specification-links.html#draft-4).
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* For details on supported JSON Schema properties and syntax, see the
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* related WordPress REST API Schema documentation:
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* https://developer.wordpress.org/rest-api/extending-the-rest-api/schema/#json-schema-basics
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*
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* Defining schemas is mandatory when there is a value to pass or return.
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* They ensure data integrity, improve developer experience, and enable
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* better documentation:
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*
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* 'input_schema' => array(
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* 'type' => 'string',
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* 'description' => __( 'The text to be analyzed.', 'my-plugin' ),
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* 'minLength' => 10,
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* 'required' => true,
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* ),
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* 'output_schema' => array(
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* 'type' => 'string',
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* 'enum' => array( 'positive', 'negative', 'neutral' ),
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* 'description' => __( 'The sentiment result: positive, negative, or neutral.', 'my-plugin' ),
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* 'required' => true,
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* ),
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*
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* ### Callbacks
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*
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* #### Execute Callback
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*
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* The execute callback performs the ability's core functionality. It receives
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* optional input data and returns either a result or `WP_Error` on failure.
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*
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* function my_plugin_analyze_text( string $input ): string|WP_Error {
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* $score = My_Plugin::perform_sentiment_analysis( $input );
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* if ( is_wp_error( $score ) ) {
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* return $score;
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* }
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* return My_Plugin::interpret_sentiment_score( $score );
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* }
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*
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* #### Permission Callback
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*
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* The permission callback determines whether the ability can be executed.
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* It receives the same input as the execute callback and must return a
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* boolean or `WP_Error`. Common use cases include checking user capabilities,
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* validating API keys, or verifying system state:
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*
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* function my_plugin_can_analyze_text( string $input ): bool|WP_Error {
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* return current_user_can( 'edit_posts' );
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* }
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*
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* ### REST API Integration
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*
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* Abilities can be exposed through the REST API by setting `show_in_rest`
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* to `true` in the meta configuration:
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*
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* 'meta' => array(
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* 'show_in_rest' => true,
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* ),
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*
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* This allows abilities to be invoked via HTTP requests to the WordPress REST API.
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*
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* @since 6.9.0
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*
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* @see WP_Abilities_Registry::register()
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* @see wp_register_ability_category()
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* @see wp_unregister_ability()
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*
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* @param string $name The name of the ability. Must be a namespaced string containing
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* a prefix, e.g., `my-plugin/my-ability`. Can only contain lowercase
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* alphanumeric characters, dashes, and forward slashes.
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* @param array<string, mixed> $args {
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* An associative array of arguments for configuring the ability.
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*
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* @type string $label Required. The human-readable label for the ability.
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* @type string $description Required. A detailed description of what the ability does
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* and when it should be used.
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* @type string $category Required. The ability category slug this ability belongs to.
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* The ability category must be registered via `wp_register_ability_category()`
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* before registering the ability.
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* @type callable $execute_callback Required. A callback function to execute when the ability is invoked.
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* Receives optional mixed input data and must return either a result
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* value (any type) or a `WP_Error` object on failure.
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* @type callable $permission_callback Required. A callback function to check permissions before execution.
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* Receives optional mixed input data (same as `execute_callback`) and
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* must return `true`/`false` for simple checks, or `WP_Error` for
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* detailed error responses.
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* @type array<string, mixed> $input_schema Optional. JSON Schema definition for validating the ability's input.
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* Must be a valid JSON Schema object defining the structure and
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* constraints for input data. Used for automatic validation and
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* API documentation.
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* @type array<string, mixed> $output_schema Optional. JSON Schema definition for the ability's output.
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* Describes the structure of successful return values from
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* `execute_callback`. Used for documentation and validation.
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* @type array<string, mixed> $meta {
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* Optional. Additional metadata for the ability.
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*
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* @type array<string, bool|null> $annotations {
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* Optional. Semantic annotations describing the ability's behavioral characteristics.
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* These annotations are hints for tooling and documentation.
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*
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* @type bool|null $readonly Optional. If true, the ability does not modify its environment.
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* @type bool|null $destructive Optional. If true, the ability may perform destructive updates to its environment.
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* If false, the ability performs only additive updates.
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* @type bool|null $idempotent Optional. If true, calling the ability repeatedly with the same arguments
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* will have no additional effect on its environment.
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* }
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* @type bool $show_in_rest Optional. Whether to expose this ability in the REST API.
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* When true, the ability can be invoked via HTTP requests.
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* Default false.
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* }
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* @type string $ability_class Optional. Fully-qualified custom class name to instantiate
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* instead of the default `WP_Ability` class. The custom class
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* must extend `WP_Ability`. Useful for advanced customization
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* of ability behavior.
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* }
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* @return WP_Ability|null The registered ability instance on success, `null` on failure.
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*/
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function wp_register_ability( string $name, array $args ): ?WP_Ability {
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if ( ! doing_action( 'wp_abilities_api_init' ) ) {
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_doing_it_wrong(
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__FUNCTION__,
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sprintf(
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/* translators: 1: wp_abilities_api_init, 2: string value of the ability name. */
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__( 'Abilities must be registered on the %1$s action. The ability %2$s was not registered.' ),
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'<code>wp_abilities_api_init</code>',
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'<code>' . esc_html( $name ) . '</code>'
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),
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'6.9.0'
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);
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return null;
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}
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$registry = WP_Abilities_Registry::get_instance();
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if ( null === $registry ) {
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return null;
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}
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return $registry->register( $name, $args );
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}
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/**
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* Unregisters an ability from the Abilities API.
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*
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* Removes a previously registered ability from the global registry. Use this to
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* disable abilities provided by other plugins or when an ability is no longer needed.
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*
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* Can be called at any time after the ability has been registered.
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*
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* Example:
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*
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* if ( wp_has_ability( 'other-plugin/some-ability' ) ) {
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* wp_unregister_ability( 'other-plugin/some-ability' );
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* }
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*
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* @since 6.9.0
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*
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* @see WP_Abilities_Registry::unregister()
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* @see wp_register_ability()
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*
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* @param string $name The name of the ability to unregister, including namespace prefix
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* (e.g., 'my-plugin/my-ability').
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* @return WP_Ability|null The unregistered ability instance on success, `null` on failure.
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*/
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function wp_unregister_ability( string $name ): ?WP_Ability {
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$registry = WP_Abilities_Registry::get_instance();
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if ( null === $registry ) {
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return null;
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}
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return $registry->unregister( $name );
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}
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/**
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* Checks if an ability is registered.
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*
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* Use this for conditional logic and feature detection before attempting to
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* retrieve or use an ability.
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*
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* Example:
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*
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* // Displays different UI based on available abilities.
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* if ( wp_has_ability( 'premium-plugin/advanced-export' ) ) {
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* echo 'Export with Premium Features';
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* } else {
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* echo 'Basic Export';
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* }
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*
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* @since 6.9.0
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*
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* @see WP_Abilities_Registry::is_registered()
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* @see wp_get_ability()
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*
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* @param string $name The name of the ability to check, including namespace prefix
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* (e.g., 'my-plugin/my-ability').
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* @return bool `true` if the ability is registered, `false` otherwise.
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*/
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function wp_has_ability( string $name ): bool {
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$registry = WP_Abilities_Registry::get_instance();
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if ( null === $registry ) {
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return false;
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}
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return $registry->is_registered( $name );
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}
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/**
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* Retrieves a registered ability.
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*
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* Returns the ability instance for inspection or use. The instance provides access
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* to the ability's configuration, metadata, and execution methods.
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*
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* Example:
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*
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* // Prints information about a registered ability.
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* $ability = wp_get_ability( 'my-plugin/export-data' );
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* if ( $ability ) {
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* echo $ability->get_label() . ': ' . $ability->get_description();
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* }
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*
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* @since 6.9.0
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*
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* @see WP_Abilities_Registry::get_registered()
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* @see wp_has_ability()
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*
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* @param string $name The name of the ability, including namespace prefix
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* (e.g., 'my-plugin/my-ability').
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* @return WP_Ability|null The registered ability instance, or `null` if not registered.
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*/
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function wp_get_ability( string $name ): ?WP_Ability {
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$registry = WP_Abilities_Registry::get_instance();
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if ( null === $registry ) {
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return null;
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}
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return $registry->get_registered( $name );
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}
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/**
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* Retrieves all registered abilities.
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*
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* Returns an array of all ability instances currently registered in the system.
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* Use this for discovery, debugging, or building administrative interfaces.
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*
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* Example:
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*
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* // Prints information about all available abilities.
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* $abilities = wp_get_abilities();
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* foreach ( $abilities as $ability ) {
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* echo $ability->get_label() . ': ' . $ability->get_description() . "\n";
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* }
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*
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* @since 6.9.0
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*
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* @see WP_Abilities_Registry::get_all_registered()
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*
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* @return WP_Ability[] An array of registered WP_Ability instances. Returns an empty
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* array if no abilities are registered or if the registry is unavailable.
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*/
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function wp_get_abilities(): array {
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$registry = WP_Abilities_Registry::get_instance();
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if ( null === $registry ) {
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return array();
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}
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return $registry->get_all_registered();
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}
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/**
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* Registers a new ability category.
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*
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* Ability categories provide a way to organize and group related abilities for better
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* discoverability and management. Ability categories must be registered before abilities
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* that reference them.
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*
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* Ability categories must be registered on the `wp_abilities_api_categories_init` action hook.
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*
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* Example:
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*
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* function my_plugin_register_categories() {
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* wp_register_ability_category(
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* 'content-management',
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* array(
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* 'label' => __( 'Content Management', 'my-plugin' ),
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* 'description' => __( 'Abilities for managing and organizing content.', 'my-plugin' ),
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* )
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* );
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* }
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* add_action( 'wp_abilities_api_categories_init', 'my_plugin_register_categories' );
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*
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* @since 6.9.0
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*
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* @see WP_Ability_Categories_Registry::register()
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* @see wp_register_ability()
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* @see wp_unregister_ability_category()
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*
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* @param string $slug The unique slug for the ability category. Must contain only lowercase
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* alphanumeric characters and dashes (e.g., 'data-export').
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* @param array<string, mixed> $args {
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* An associative array of arguments for the ability category.
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*
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* @type string $label Required. The human-readable label for the ability category.
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* @type string $description Required. A description of what abilities in this category do.
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* @type array<string, mixed> $meta Optional. Additional metadata for the ability category.
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* }
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* @return WP_Ability_Category|null The registered ability category instance on success, `null` on failure.
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*/
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function wp_register_ability_category( string $slug, array $args ): ?WP_Ability_Category {
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if ( ! doing_action( 'wp_abilities_api_categories_init' ) ) {
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_doing_it_wrong(
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__FUNCTION__,
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sprintf(
|
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/* translators: 1: wp_abilities_api_categories_init, 2: ability category slug. */
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__( 'Ability categories must be registered on the %1$s action. The ability category %2$s was not registered.' ),
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'<code>wp_abilities_api_categories_init</code>',
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'<code>' . esc_html( $slug ) . '</code>'
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),
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'6.9.0'
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);
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return null;
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}
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$registry = WP_Ability_Categories_Registry::get_instance();
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if ( null === $registry ) {
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return null;
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|
}
|
|
|
|
return $registry->register( $slug, $args );
|
|
}
|
|
|
|
/**
|
|
* Unregisters an ability category.
|
|
*
|
|
* Removes a previously registered ability category from the global registry. Use this to
|
|
* disable ability categories that are no longer needed.
|
|
*
|
|
* Can be called at any time after the ability category has been registered.
|
|
*
|
|
* Example:
|
|
*
|
|
* if ( wp_has_ability_category( 'deprecated-category' ) ) {
|
|
* wp_unregister_ability_category( 'deprecated-category' );
|
|
* }
|
|
*
|
|
* @since 6.9.0
|
|
*
|
|
* @see WP_Ability_Categories_Registry::unregister()
|
|
* @see wp_register_ability_category()
|
|
*
|
|
* @param string $slug The slug of the ability category to unregister.
|
|
* @return WP_Ability_Category|null The unregistered ability category instance on success, `null` on failure.
|
|
*/
|
|
function wp_unregister_ability_category( string $slug ): ?WP_Ability_Category {
|
|
$registry = WP_Ability_Categories_Registry::get_instance();
|
|
if ( null === $registry ) {
|
|
return null;
|
|
}
|
|
|
|
return $registry->unregister( $slug );
|
|
}
|
|
|
|
/**
|
|
* Checks if an ability category is registered.
|
|
*
|
|
* Use this for conditional logic and feature detection before attempting to
|
|
* retrieve or use an ability category.
|
|
*
|
|
* Example:
|
|
*
|
|
* // Displays different UI based on available ability categories.
|
|
* if ( wp_has_ability_category( 'premium-features' ) ) {
|
|
* echo 'Premium Features Available';
|
|
* } else {
|
|
* echo 'Standard Features';
|
|
* }
|
|
*
|
|
* @since 6.9.0
|
|
*
|
|
* @see WP_Ability_Categories_Registry::is_registered()
|
|
* @see wp_get_ability_category()
|
|
*
|
|
* @param string $slug The slug of the ability category to check.
|
|
* @return bool `true` if the ability category is registered, `false` otherwise.
|
|
*/
|
|
function wp_has_ability_category( string $slug ): bool {
|
|
$registry = WP_Ability_Categories_Registry::get_instance();
|
|
if ( null === $registry ) {
|
|
return false;
|
|
}
|
|
|
|
return $registry->is_registered( $slug );
|
|
}
|
|
|
|
/**
|
|
* Retrieves a registered ability category.
|
|
*
|
|
* Returns the ability category instance for inspection or use. The instance provides access
|
|
* to the ability category's configuration and metadata.
|
|
*
|
|
* Example:
|
|
*
|
|
* // Prints information about a registered ability category.
|
|
* $ability_category = wp_get_ability_category( 'content-management' );
|
|
* if ( $ability_category ) {
|
|
* echo $ability_category->get_label() . ': ' . $ability_category->get_description();
|
|
* }
|
|
*
|
|
* @since 6.9.0
|
|
*
|
|
* @see WP_Ability_Categories_Registry::get_registered()
|
|
* @see wp_has_ability_category()
|
|
* @see wp_get_ability_categories()
|
|
*
|
|
* @param string $slug The slug of the ability category.
|
|
* @return WP_Ability_Category|null The ability category instance, or `null` if not registered.
|
|
*/
|
|
function wp_get_ability_category( string $slug ): ?WP_Ability_Category {
|
|
$registry = WP_Ability_Categories_Registry::get_instance();
|
|
if ( null === $registry ) {
|
|
return null;
|
|
}
|
|
|
|
return $registry->get_registered( $slug );
|
|
}
|
|
|
|
/**
|
|
* Retrieves all registered ability categories.
|
|
*
|
|
* Returns an array of all ability category instances currently registered in the system.
|
|
* Use this for discovery, debugging, or building administrative interfaces.
|
|
*
|
|
* Example:
|
|
*
|
|
* // Prints information about all available ability categories.
|
|
* $ability_categories = wp_get_ability_categories();
|
|
* foreach ( $ability_categories as $ability_category ) {
|
|
* echo $ability_category->get_label() . ': ' . $ability_category->get_description() . "\n";
|
|
* }
|
|
*
|
|
* @since 6.9.0
|
|
*
|
|
* @see WP_Ability_Categories_Registry::get_all_registered()
|
|
* @see wp_get_ability_category()
|
|
*
|
|
* @return WP_Ability_Category[] An array of registered ability category instances. Returns an empty array
|
|
* if no ability categories are registered or if the registry is unavailable.
|
|
*/
|
|
function wp_get_ability_categories(): array {
|
|
$registry = WP_Ability_Categories_Registry::get_instance();
|
|
if ( null === $registry ) {
|
|
return array();
|
|
}
|
|
|
|
return $registry->get_all_registered();
|
|
}
|