plugin.php

<?php
/**
 * Plugin Name: WP REST API
 * Description: JSON-based REST API for WordPress, originally developed as part of GSoC 2013.
 * Author: WP REST API Team
 * Author URI: http://v2.wp-api.org
 * Version: 2.0-beta15
 * Plugin URI: https://github.com/WP-API/WP-API
 * License: GPL2+
 */

/**
 * WP_REST_Controller class.
 */
if ( ! class_exists( 'WP_REST_Controller' ) ) {
	require_once dirname( __FILE__ ) . '/lib/endpoints/class-wp-rest-controller.php';
}

/**
 * WP_REST_Posts_Controller class.
 */
if ( ! class_exists( 'WP_REST_Posts_Controller' ) ) {
	require_once dirname( __FILE__ ) . '/lib/endpoints/class-wp-rest-posts-controller.php';
}

/**
 * WP_REST_Attachments_Controller class.
 */
if ( ! class_exists( 'WP_REST_Attachments_Controller' ) ) {
	require_once dirname( __FILE__ ) . '/lib/endpoints/class-wp-rest-attachments-controller.php';
}

/**
 * WP_REST_Post_Types_Controller class.
 */
if ( ! class_exists( 'WP_REST_Post_Types_Controller' ) ) {
	require_once dirname( __FILE__ ) . '/lib/endpoints/class-wp-rest-post-types-controller.php';
}

/**
 * WP_REST_Post_Statuses_Controller class.
 */
if ( ! class_exists( 'WP_REST_Post_Statuses_Controller' ) ) {
	require_once dirname( __FILE__ ) . '/lib/endpoints/class-wp-rest-post-statuses-controller.php';
}

/**
 * WP_REST_Revisions_Controller class.
 */
if ( ! class_exists( 'WP_REST_Revisions_Controller' ) ) {
	require_once dirname( __FILE__ ) . '/lib/endpoints/class-wp-rest-revisions-controller.php';
}

/**
 * WP_REST_Taxonomies_Controller class.
 */
if ( ! class_exists( 'WP_REST_Taxonomies_Controller' ) ) {
	require_once dirname( __FILE__ ) . '/lib/endpoints/class-wp-rest-taxonomies-controller.php';
}

/**
 * WP_REST_Terms_Controller class.
 */
if ( ! class_exists( 'WP_REST_Terms_Controller' ) ) {
	require_once dirname( __FILE__ ) . '/lib/endpoints/class-wp-rest-terms-controller.php';
}

/**
 * WP_REST_Users_Controller class.
 */
if ( ! class_exists( 'WP_REST_Users_Controller' ) ) {
	require_once dirname( __FILE__ ) . '/lib/endpoints/class-wp-rest-users-controller.php';
}

/**
 * WP_REST_Comments_Controller class.
 */
if ( ! class_exists( 'WP_REST_Comments_Controller' ) ) {
	require_once dirname( __FILE__ ) . '/lib/endpoints/class-wp-rest-comments-controller.php';
}

/**
 * WP_REST_Settings_Controller class.
 */
if ( ! class_exists( 'WP_REST_Settings_Controller' ) ) {
	require_once dirname( __FILE__ ) . '/lib/endpoints/class-wp-rest-settings-controller.php';
}

/**
 * WP_REST_Meta_Fields class.
 */
if ( ! class_exists( 'WP_REST_Meta_Fields' ) ) {
	require_once dirname( __FILE__ ) . '/lib/fields/class-wp-rest-meta-fields.php';
}

/**
 * WP_REST_Comment_Meta_Fields class.
 */
if ( ! class_exists( 'WP_REST_Comment_Meta_Fields' ) ) {
	require_once dirname( __FILE__ ) . '/lib/fields/class-wp-rest-comment-meta-fields.php';
}

/**
 * WP_REST_Post_Meta_Fields class.
 */
if ( ! class_exists( 'WP_REST_Post_Meta_Fields' ) ) {
	require_once dirname( __FILE__ ) . '/lib/fields/class-wp-rest-post-meta-fields.php';
}

/**
 * WP_REST_Term_Meta_Fields class.
 */
if ( ! class_exists( 'WP_REST_Term_Meta_Fields' ) ) {
	require_once dirname( __FILE__ ) . '/lib/fields/class-wp-rest-term-meta-fields.php';
}

/**
 * WP_REST_User_Meta_Fields class.
 */
if ( ! class_exists( 'WP_REST_User_Meta_Fields' ) ) {
	require_once dirname( __FILE__ ) . '/lib/fields/class-wp-rest-user-meta-fields.php';
}

/**
 * REST extras.
 */
include_once( dirname( __FILE__ ) . '/extras.php' );
require_once( dirname( __FILE__ ) . '/core-integration.php' );

add_filter( 'init', '_add_extra_api_post_type_arguments', 11 );
add_action( 'init', '_add_extra_api_taxonomy_arguments', 11 );
add_action( 'rest_api_init', 'rest_register_settings', 0 );
add_action( 'rest_api_init', 'create_initial_rest_routes', 0 );

/**
 * Adds extra post type registration arguments.
 *
 * These attributes will eventually be committed to core.
 *
 * @since 4.4.0
 *
 * @global array $wp_post_types Registered post types.
 */
function _add_extra_api_post_type_arguments() {
	global $wp_post_types;

	if ( isset( $wp_post_types['post'] ) ) {
		$wp_post_types['post']->show_in_rest = true;
		$wp_post_types['post']->rest_base = 'posts';
		$wp_post_types['post']->rest_controller_class = 'WP_REST_Posts_Controller';
	}

	if ( isset( $wp_post_types['page'] ) ) {
		$wp_post_types['page']->show_in_rest = true;
		$wp_post_types['page']->rest_base = 'pages';
		$wp_post_types['page']->rest_controller_class = 'WP_REST_Posts_Controller';
	}

	if ( isset( $wp_post_types['attachment'] ) ) {
		$wp_post_types['attachment']->show_in_rest = true;
		$wp_post_types['attachment']->rest_base = 'media';
		$wp_post_types['attachment']->rest_controller_class = 'WP_REST_Attachments_Controller';
	}
}

/**
 * Adds extra taxonomy registration arguments.
 *
 * These attributes will eventually be committed to core.
 *
 * @since 4.4.0
 *
 * @global array $wp_taxonomies Registered taxonomies.
 */
function _add_extra_api_taxonomy_arguments() {
	global $wp_taxonomies;

	if ( isset( $wp_taxonomies['category'] ) ) {
		$wp_taxonomies['category']->show_in_rest = true;
		$wp_taxonomies['category']->rest_base = 'categories';
		$wp_taxonomies['category']->rest_controller_class = 'WP_REST_Terms_Controller';
	}

	if ( isset( $wp_taxonomies['post_tag'] ) ) {
		$wp_taxonomies['post_tag']->show_in_rest = true;
		$wp_taxonomies['post_tag']->rest_base = 'tags';
		$wp_taxonomies['post_tag']->rest_controller_class = 'WP_REST_Terms_Controller';
	}
}


/**
 * Register the settings to be used in the REST API.
 *
 * This is required are WordPress Core does not internally register
 * it's settings via `register_rest_setting()`. This should be removed
 * once / if core starts to register settings internally.
 */
function rest_register_settings() {
	global $wp_version;
	if ( version_compare( $wp_version, '4.7-alpha', '<' ) ) {
		return;
	}

	register_setting( 'general', 'blogname', array(
		'show_in_rest' => array(
			'name' => 'title',
		),
		'type'         => 'string',
		'description'  => __( 'Site title.' ),
	) );

	register_setting( 'general', 'blogdescription', array(
		'show_in_rest' => array(
			'name' => 'description',
		),
		'type'         => 'string',
		'description'  => __( 'Site description.' ),
	) );

	register_setting( 'general', 'siteurl', array(
		'show_in_rest' => array(
			'name'    => 'url',
			'schema'  => array(
				'format' => 'uri',
			),
		),
		'type'         => 'string',
		'description'  => __( 'Site URL' ),
	) );

	register_setting( 'general', 'admin_email', array(
		'show_in_rest' => array(
			'name'    => 'email',
			'schema'  => array(
				'format' => 'email',
			),
		),
		'type'         => 'string',
		'description'  => __( 'This address is used for admin purposes. If you change this we will send you an email at your new address to confirm it. The new address will not become active until confirmed.' ),
	) );

	register_setting( 'general', 'timezone_string', array(
		'show_in_rest' => array(
			'name' => 'timezone',
		),
		'type'         => 'string',
		'description'  => __( 'A city in the same timezone as you.' ),
	) );

	register_setting( 'general', 'date_format', array(
		'show_in_rest' => true,
		'type'         => 'string',
		'description'  => __( 'A date format for all date strings.' ),
	) );

	register_setting( 'general', 'time_format', array(
		'show_in_rest' => true,
		'type'         => 'string',
		'description'  => __( 'A time format for all time strings.' ),
	) );

	register_setting( 'general', 'start_of_week', array(
		'show_in_rest' => true,
		'type'         => 'number',
		'description'  => __( 'A day number of the week that the week should start on.' ),
	) );

	register_setting( 'general', 'WPLANG', array(
		'show_in_rest' => array(
			'name' => 'language',
		),
		'type'         => 'string',
		'description'  => __( 'WordPress locale code.' ),
		'default'      => 'en_US',
	) );

	register_setting( 'writing', 'use_smilies', array(
		'show_in_rest' => true,
		'type'         => 'boolean',
		'description'  => __( 'Convert emoticons like :-) and :-P to graphics on display.' ),
		'default'      => true,
	) );

	register_setting( 'writing', 'default_category', array(
		'show_in_rest' => true,
		'type'         => 'number',
		'description'  => __( 'Default category.' ),
	) );

	register_setting( 'writing', 'default_post_format', array(
		'show_in_rest' => true,
		'type'         => 'string',
		'description'  => __( 'Default post format.' ),
	) );

	register_setting( 'reading', 'posts_per_page', array(
		'show_in_rest' => true,
		'type'         => 'number',
		'description'  => __( 'Blog pages show at most.' ),
		'default'      => 10,
	) );
}


if ( ! function_exists( 'create_initial_rest_routes' ) ) {
	/**
	 * Registers default REST API routes.
	 *
	 * @since 4.4.0
	 */
	function create_initial_rest_routes() {

		foreach ( get_post_types( array( 'show_in_rest' => true ), 'objects' ) as $post_type ) {
			$class = ! empty( $post_type->rest_controller_class ) ? $post_type->rest_controller_class : 'WP_REST_Posts_Controller';

			if ( ! class_exists( $class ) ) {
				continue;
			}
			$controller = new $class( $post_type->name );
			if ( ! is_subclass_of( $controller, 'WP_REST_Controller' ) ) {
				continue;
			}

			$controller->register_routes();

			if ( post_type_supports( $post_type->name, 'revisions' ) ) {
				$revisions_controller = new WP_REST_Revisions_Controller( $post_type->name );
				$revisions_controller->register_routes();
			}
		}

		// Post types.
		$controller = new WP_REST_Post_Types_Controller;
		$controller->register_routes();

		// Post statuses.
		$controller = new WP_REST_Post_Statuses_Controller;
		$controller->register_routes();

		// Taxonomies.
		$controller = new WP_REST_Taxonomies_Controller;
		$controller->register_routes();

		// Terms.
		foreach ( get_taxonomies( array( 'show_in_rest' => true ), 'object' ) as $taxonomy ) {
			$class = ! empty( $taxonomy->rest_controller_class ) ? $taxonomy->rest_controller_class : 'WP_REST_Terms_Controller';

			if ( ! class_exists( $class ) ) {
				continue;
			}
			$controller = new $class( $taxonomy->name );
			if ( ! is_subclass_of( $controller, 'WP_REST_Controller' ) ) {
				continue;
			}

			$controller->register_routes();
		}

		// Users.
		$controller = new WP_REST_Users_Controller;
		$controller->register_routes();

		// Comments.
		$controller = new WP_REST_Comments_Controller;
		$controller->register_routes();

		// Settings. 4.7+ only.
		global $wp_version;
		if ( version_compare( $wp_version, '4.7-alpha', '>=' ) ) {
			$controller = new WP_REST_Settings_Controller;
			$controller->register_routes();
		}
	}
}

if ( ! function_exists( 'rest_authorization_required_code' ) ) {
	/**
	 * Returns a contextual HTTP error code for authorization failure.
	 *
	 * @return integer
	 */
	function rest_authorization_required_code() {
		return is_user_logged_in() ? 403 : 401;
	}
}

if ( ! function_exists( 'register_rest_field' ) ) {
	/**
	 * Registers a new field on an existing WordPress object type.
	 *
	 * @global array $wp_rest_additional_fields Holds registered fields, organized
	 *                                          by object type.
	 *
	 * @param string|array $object_type Object(s) the field is being registered
	 *                                  to, "post"|"term"|"comment" etc.
	 * @param string $attribute         The attribute name.
	 * @param array  $args {
	 *     Optional. An array of arguments used to handle the registered field.
	 *
	 *     @type string|array|null $get_callback    Optional. The callback function used to retrieve the field
	 *                                              value. Default is 'null', the field will not be returned in
	 *                                              the response.
	 *     @type string|array|null $update_callback Optional. The callback function used to set and update the
	 *                                              field value. Default is 'null', the value cannot be set or
	 *                                              updated.
	 *     @type string|array|null $schema          Optional. The callback function used to create the schema for
	 *                                              this field. Default is 'null', no schema entry will be returned.
	 * }
	 */
	function register_rest_field( $object_type, $attribute, $args = array() ) {
		$defaults = array(
			'get_callback'    => null,
			'update_callback' => null,
			'schema'          => null,
		);

		$args = wp_parse_args( $args, $defaults );

		global $wp_rest_additional_fields;

		$object_types = (array) $object_type;

		foreach ( $object_types as $object_type ) {
			$wp_rest_additional_fields[ $object_type ][ $attribute ] = $args;
		}
	}
}

if ( ! function_exists( 'register_api_field' ) ) {
	/**
	 * Backwards compat shim
	 */
	function register_api_field( $object_type, $attributes, $args = array() ) {
		_deprecated_function( 'register_api_field', 'WPAPI-2.0', 'register_rest_field' );
		register_rest_field( $object_type, $attributes, $args );
	}
}

if ( ! function_exists( 'rest_validate_request_arg' ) ) {
	/**
	 * Validate a request argument based on details registered to the route.
	 *
	 * @param  mixed            $value
	 * @param  WP_REST_Request  $request
	 * @param  string           $param
	 * @return WP_Error|boolean
	 */
	function rest_validate_request_arg( $value, $request, $param ) {

		$attributes = $request->get_attributes();
		if ( ! isset( $attributes['args'][ $param ] ) || ! is_array( $attributes['args'][ $param ] ) ) {
			return true;
		}
		$args = $attributes['args'][ $param ];

		if ( ! empty( $args['enum'] ) ) {
			if ( ! in_array( $value, $args['enum'] ) ) {
				return new WP_Error( 'rest_invalid_param', sprintf( __( '%s is not one of %s' ), $param, implode( ', ', $args['enum'] ) ) );
			}
		}

		if ( 'integer' === $args['type'] && ! is_numeric( $value ) ) {
			return new WP_Error( 'rest_invalid_param', sprintf( __( '%s is not of type %s' ), $param, 'integer' ) );
		}

		if ( 'boolean' === $args['type'] && ! rest_is_boolean( $value ) ) {
			return new WP_Error( 'rest_invalid_param', sprintf( __( '%s is not of type %s' ), $value, 'boolean' ) );
		}

		if ( 'string' === $args['type'] && ! is_string( $value ) ) {
			return new WP_Error( 'rest_invalid_param', sprintf( __( '%s is not of type %s' ), $param, 'string' ) );
		}

		if ( isset( $args['format'] ) ) {
			switch ( $args['format'] ) {
				case 'date-time' :
					if ( ! rest_parse_date( $value ) ) {
						return new WP_Error( 'rest_invalid_date', __( 'The date you provided is invalid.' ) );
					}
					break;

				case 'email' :
					if ( ! is_email( $value ) ) {
						return new WP_Error( 'rest_invalid_email', __( 'The email address you provided is invalid.' ) );
					}
					break;
				case 'ipv4' :
					if ( ! rest_is_ip_address( $value ) ) {
						return new WP_Error( 'rest_invalid_param', sprintf( __( '%s is not a valid IP address.' ), $value ) );
					}
					break;
			}
		}

		if ( in_array( $args['type'], array( 'numeric', 'integer' ) ) && ( isset( $args['minimum'] ) || isset( $args['maximum'] ) ) ) {
			if ( isset( $args['minimum'] ) && ! isset( $args['maximum'] ) ) {
				if ( ! empty( $args['exclusiveMinimum'] ) && $value <= $args['minimum'] ) {
					return new WP_Error( 'rest_invalid_param', sprintf( __( '%s must be greater than %d (exclusive)' ), $param, $args['minimum'] ) );
				} else if ( empty( $args['exclusiveMinimum'] ) && $value < $args['minimum'] ) {
					return new WP_Error( 'rest_invalid_param', sprintf( __( '%s must be greater than %d (inclusive)' ), $param, $args['minimum'] ) );
				}
			} else if ( isset( $args['maximum'] ) && ! isset( $args['minimum'] ) ) {
				if ( ! empty( $args['exclusiveMaximum'] ) && $value >= $args['maximum'] ) {
					return new WP_Error( 'rest_invalid_param', sprintf( __( '%s must be less than %d (exclusive)' ), $param, $args['maximum'] ) );
				} else if ( empty( $args['exclusiveMaximum'] ) && $value > $args['maximum'] ) {
					return new WP_Error( 'rest_invalid_param', sprintf( __( '%s must be less than %d (inclusive)' ), $param, $args['maximum'] ) );
				}
			} else if ( isset( $args['maximum'] ) && isset( $args['minimum'] ) ) {
				if ( ! empty( $args['exclusiveMinimum'] ) && ! empty( $args['exclusiveMaximum'] ) ) {
					if ( $value >= $args['maximum'] || $value <= $args['minimum'] ) {
						return new WP_Error( 'rest_invalid_param', sprintf( __( '%s must be between %d (exclusive) and %d (exclusive)' ), $param, $args['minimum'], $args['maximum'] ) );
					}
				} else if ( empty( $args['exclusiveMinimum'] ) && ! empty( $args['exclusiveMaximum'] ) ) {
					if ( $value >= $args['maximum'] || $value < $args['minimum'] ) {
						return new WP_Error( 'rest_invalid_param', sprintf( __( '%s must be between %d (inclusive) and %d (exclusive)' ), $param, $args['minimum'], $args['maximum'] ) );
					}
				} else if ( ! empty( $args['exclusiveMinimum'] ) && empty( $args['exclusiveMaximum'] ) ) {
					if ( $value > $args['maximum'] || $value <= $args['minimum'] ) {
						return new WP_Error( 'rest_invalid_param', sprintf( __( '%s must be between %d (exclusive) and %d (inclusive)' ), $param, $args['minimum'], $args['maximum'] ) );
					}
				} else if ( empty( $args['exclusiveMinimum'] ) && empty( $args['exclusiveMaximum'] ) ) {
					if ( $value > $args['maximum'] || $value < $args['minimum'] ) {
						return new WP_Error( 'rest_invalid_param', sprintf( __( '%s must be between %d (inclusive) and %d (inclusive)' ), $param, $args['minimum'], $args['maximum'] ) );
					}
				}
			}
		}

		return true;
	}
}

if ( ! function_exists( 'rest_sanitize_request_arg' ) ) {
	/**
	 * Sanitize a request argument based on details registered to the route.
	 *
	 * @param  mixed            $value
	 * @param  WP_REST_Request  $request
	 * @param  string           $param
	 * @return mixed
	 */
	function rest_sanitize_request_arg( $value, $request, $param ) {

		$attributes = $request->get_attributes();
		if ( ! isset( $attributes['args'][ $param ] ) || ! is_array( $attributes['args'][ $param ] ) ) {
			return $value;
		}
		$args = $attributes['args'][ $param ];

		if ( 'integer' === $args['type'] ) {
			return (int) $value;
		}

		if ( 'boolean' === $args['type'] ) {
			return rest_sanitize_boolean( $value );
		}

		if ( isset( $args['format'] ) ) {
			switch ( $args['format'] ) {
				case 'date-time' :
					return sanitize_text_field( $value );

				case 'email' :
					/*
					 * sanitize_email() validates, which would be unexpected
					 */
					return sanitize_text_field( $value );

				case 'uri' :
					return esc_url_raw( $value );

				case 'ipv4' :
					return sanitize_text_field( $value );
			}
		}

		return $value;
	}
}


if ( ! function_exists( 'rest_parse_request_arg' ) ) {
	/**
	 * Parse a request argument based on details registered to the route.
	 *
	 * Runs a validation check and sanitizes the value, primarily to be used via
	 * the `sanitize_callback` arguments in the endpoint args registration.
	 *
	 * @param  mixed            $value
	 * @param  WP_REST_Request  $request
	 * @param  string           $param
	 * @return mixed
	 */
	function rest_parse_request_arg( $value, $request, $param ) {

		$is_valid = rest_validate_request_arg( $value, $request, $param );

		if ( is_wp_error( $is_valid ) ) {
			return $is_valid;
		}

		$value = rest_sanitize_request_arg( $value, $request, $param );

		return $value;
	}
}

if ( ! function_exists( 'rest_is_ip_address' ) ) {
	/**
	 * Determines if a IPv4 address is valid.
	 *
	 * Does not handle IPv6 addresses.
	 *
	 * @param  string $ipv4 IP 32-bit address.
	 * @return string|false The valid IPv4 address, otherwise false.
	 */
	function rest_is_ip_address( $ipv4 ) {
		$pattern = '/^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/';

		if ( ! preg_match( $pattern, $ipv4 ) ) {
			return false;
		}

		return $ipv4;
	}
}

/**
 * Changes a boolean-like value into the proper boolean value.
 *
 * @param bool|string|int $value The value being evaluated.
 * @return boolean Returns the proper associated boolean value.
 */
if ( ! function_exists( 'rest_sanitize_boolean' ) ) {
	function rest_sanitize_boolean( $value ) {
		// String values are translated to `true`; make sure 'false' is false.
		if ( is_string( $value )  ) {
			$value = strtolower( $value );
			if ( in_array( $value, array( 'false', '0' ), true ) ) {
				$value = false;
			}
		}

		// Everything else will map nicely to boolean.
		return (boolean) $value;
	}
}

/**
 * Determines if a given value is boolean-like.
 *
 * @param bool|string $maybe_bool The value being evaluated.
 * @return boolean True if a boolean, otherwise false.
 */
if ( ! function_exists( 'rest_is_boolean' ) ) {
	function rest_is_boolean( $maybe_bool ) {
		if ( is_bool( $maybe_bool ) ) {
			return true;
		}

		if ( is_string( $maybe_bool ) ) {
			$maybe_bool = strtolower( $maybe_bool );

			$valid_boolean_values = array(
				'false',
				'true',
				'0',
				'1',
			);

			return in_array( $maybe_bool, $valid_boolean_values, true );
		}

		if ( is_int( $maybe_bool ) ) {
			return in_array( $maybe_bool, array( 0, 1 ), true );
		}

		return false;
	}
}