<?php

/**

 * REST API: WP_REST_Taxonomies_Controller class

 *

 * @package WordPress

 * @subpackage REST_API

 * @since 4.7.0

 */

/**

 * Core class used to manage taxonomies via the REST API.

 *

 * @since 4.7.0

 *

 * @see WP_REST_Controller

 */

class WP_REST_Taxonomies_Controller extends WP_REST_Controller {

	/**

	 * Constructor.

	 *

	 * @since 4.7.0

	 */

	public function __construct() {

		$this->namespace = 'wp/v2';

		$this->rest_base = 'taxonomies';

	}

	/**

	 * Registers the routes for the objects of the controller.

	 *

	 * @since 4.7.0

	 *

	 * @see register_rest_route()

	 */

	public function register_routes() {

		register_rest_route( $this->namespace, '/' . $this->rest_base, array(

			array(

				'methods'         => WP_REST_Server::READABLE,

				'callback'        => array( $this, 'get_items' ),

				'permission_callback' => array( $this, 'get_items_permissions_check' ),

				'args'            => $this->get_collection_params(),

			),

			'schema' => array( $this, 'get_public_item_schema' ),

		) );

		register_rest_route( $this->namespace, '/' . $this->rest_base . '/(?P<taxonomy>[\w-]+)', array(

			'args' => array(

				'taxonomy' => array(

					'description'  => __( 'An alphanumeric identifier for the taxonomy.' ),

					'type'         => 'string',

				),

			),

			array(

				'methods'         => WP_REST_Server::READABLE,

				'callback'        => array( $this, 'get_item' ),

				'permission_callback' => array( $this, 'get_item_permissions_check' ),

				'args'            => array(

					'context'     => $this->get_context_param( array( 'default' => 'view' ) ),

				),

			),

			'schema' => array( $this, 'get_public_item_schema' ),

		) );

	}

	/**

	 * Checks whether a given request has permission to read taxonomies.

	 *

	 * @since 4.7.0

	 *

	 * @param WP_REST_Request $request Full details about the request.

	 * @return true|WP_Error True if the request has read access, WP_Error object otherwise.

	 */

	public function get_items_permissions_check( $request ) {

		if ( 'edit' === $request['context'] ) {

			if ( ! empty( $request['type'] ) ) {

				$taxonomies = get_object_taxonomies( $request['type'], 'objects' );

			} else {

				$taxonomies = get_taxonomies( '', 'objects' );

			}

			foreach ( $taxonomies as $taxonomy ) {

				if ( ! empty( $taxonomy->show_in_rest ) && current_user_can( $taxonomy->cap->assign_terms ) ) {

					return true;

				}

			}

			return new WP_Error( 'rest_cannot_view', __( 'Sorry, you are not allowed to manage terms in this taxonomy.' ), array( 'status' => rest_authorization_required_code() ) );

		}

		return true;

	}

	/**

	 * Retrieves all public taxonomies.

	 *

	 * @since 4.7.0

	 *

	 * @param WP_REST_Request $request Full details about the request.

	 * @return WP_REST_Response Response object on success, or WP_Error object on failure.

	 */

	public function get_items( $request ) {

		// Retrieve the list of registered collection query parameters.

		$registered = $this->get_collection_params();

		if ( isset( $registered['type'] ) && ! empty( $request['type'] ) ) {

			$taxonomies = get_object_taxonomies( $request['type'], 'objects' );

		} else {

			$taxonomies = get_taxonomies( '', 'objects' );

		}

		$data = array();

		foreach ( $taxonomies as $tax_type => $value ) {

			if ( empty( $value->show_in_rest ) || ( 'edit' === $request['context'] && ! current_user_can( $value->cap->assign_terms ) ) ) {

				continue;

			}

			$tax = $this->prepare_item_for_response( $value, $request );

			$tax = $this->prepare_response_for_collection( $tax );

			$data[ $tax_type ] = $tax;

		}

		if ( empty( $data ) ) {

			// Response should still be returned as a JSON object when it is empty.

			$data = (object) $data;

		}

		return rest_ensure_response( $data );

	}

	/**

	 * Checks if a given request has access to a taxonomy.

	 *

	 * @since 4.7.0

	 *

	 * @param  WP_REST_Request $request Full details about the request.

	 * @return true|WP_Error True if the request has read access for the item, otherwise false or WP_Error object.

	 */

	public function get_item_permissions_check( $request ) {

		$tax_obj = get_taxonomy( $request['taxonomy'] );

		if ( $tax_obj ) {

			if ( empty( $tax_obj->show_in_rest ) ) {

				return false;

			}

			if ( 'edit' === $request['context'] && ! current_user_can( $tax_obj->cap->assign_terms ) ) {

				return new WP_Error( 'rest_forbidden_context', __( 'Sorry, you are not allowed to manage terms in this taxonomy.' ), array( 'status' => rest_authorization_required_code() ) );

			}

		}

		return true;

	}

	/**

	 * Retrieves a specific taxonomy.

	 *

	 * @since 4.7.0

	 *

	 * @param WP_REST_Request $request Full details about the request.

	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.

	 */

	public function get_item( $request ) {

		$tax_obj = get_taxonomy( $request['taxonomy'] );

		if ( empty( $tax_obj ) ) {

			return new WP_Error( 'rest_taxonomy_invalid', __( 'Invalid taxonomy.' ), array( 'status' => 404 ) );

		}

		$data = $this->prepare_item_for_response( $tax_obj, $request );

		return rest_ensure_response( $data );

	}

	/**

	 * Prepares a taxonomy object for serialization.

	 *

	 * @since 4.7.0

	 *

	 * @param stdClass        $taxonomy Taxonomy data.

	 * @param WP_REST_Request $request  Full details about the request.

	 * @return WP_REST_Response Response object.

	 */

	public function prepare_item_for_response( $taxonomy, $request ) {

		$base = ! empty( $taxonomy->rest_base ) ? $taxonomy->rest_base : $taxonomy->name;

		$fields = $this->get_fields_for_response( $request );

		$data   = array();

		if ( in_array( 'name', $fields, true ) ) {

			$data['name'] = $taxonomy->label;

		}

		if ( in_array( 'slug', $fields, true ) ) {

			$data['slug'] = $taxonomy->name;

		}

		if ( in_array( 'capabilities', $fields, true ) ) {

			$data['capabilities'] = $taxonomy->cap;

		}

		if ( in_array( 'description', $fields, true ) ) {

			$data['description'] = $taxonomy->description;

		}

		if ( in_array( 'labels', $fields, true ) ) {

			$data['labels'] = $taxonomy->labels;

		}

		if ( in_array( 'types', $fields, true ) ) {

			$data['types'] = $taxonomy->object_type;

		}

		if ( in_array( 'show_cloud', $fields, true ) ) {

			$data['show_cloud'] = $taxonomy->show_tagcloud;

		}

		if ( in_array( 'hierarchical', $fields, true ) ) {

			$data['hierarchical'] = $taxonomy->hierarchical;

		}

		if ( in_array( 'rest_base', $fields, true ) ) {

			$data['rest_base'] = $base;

		}

		if ( in_array( 'visibility', $fields, true ) ) {

			$data['visibility'] = array(

				'public'             => (bool) $taxonomy->public,

				'publicly_queryable' => (bool) $taxonomy->publicly_queryable,

				'show_admin_column'  => (bool) $taxonomy->show_admin_column,

				'show_in_nav_menus'  => (bool) $taxonomy->show_in_nav_menus,

				'show_in_quick_edit' => (bool) $taxonomy->show_in_quick_edit,

				'show_ui'            => (bool) $taxonomy->show_ui,

			);

		}

		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';

		$data = $this->add_additional_fields_to_object( $data, $request );

		$data = $this->filter_response_by_context( $data, $context );

		// Wrap the data in a response object.

		$response = rest_ensure_response( $data );

		$response->add_links( array(

			'collection'                => array(

				'href'                  => rest_url( sprintf( '%s/%s', $this->namespace, $this->rest_base ) ),

			),

			'https://api.w.org/items'   => array(

				'href'                  => rest_url( sprintf( 'wp/v2/%s', $base ) ),

			),

		) );

		/**

		 * Filters a taxonomy returned from the REST API.

		 *

		 * Allows modification of the taxonomy data right before it is returned.

		 *

		 * @since 4.7.0

		 *

		 * @param WP_REST_Response $response The response object.

		 * @param object           $item     The original taxonomy object.

		 * @param WP_REST_Request  $request  Request used to generate the response.

		 */

		return apply_filters( 'rest_prepare_taxonomy', $response, $taxonomy, $request );

	}

	/**

	 * Retrieves the taxonomy's schema, conforming to JSON Schema.

	 *

	 * @since 4.7.0

	 *

	 * @return array Item schema data.

	 */

	public function get_item_schema() {

		$schema = array(

			'$schema'              => 'http://json-schema.org/draft-04/schema#',

			'title'                => 'taxonomy',

			'type'                 => 'object',

			'properties'           => array(

				'capabilities'     => array(

					'description'  => __( 'All capabilities used by the taxonomy.' ),

					'type'         => 'object',

					'context'      => array( 'edit' ),

					'readonly'     => true,

				),

				'description'      => array(

					'description'  => __( 'A human-readable description of the taxonomy.' ),

					'type'         => 'string',

					'context'      => array( 'view', 'edit' ),

					'readonly'     => true,

				),

				'hierarchical'     => array(

					'description'  => __( 'Whether or not the taxonomy should have children.' ),

					'type'         => 'boolean',

					'context'      => array( 'view', 'edit' ),

					'readonly'     => true,

				),

				'labels'           => array(

					'description'  => __( 'Human-readable labels for the taxonomy for various contexts.' ),

					'type'         => 'object',

					'context'      => array( 'edit' ),

					'readonly'     => true,

				),

				'name'             => array(

					'description'  => __( 'The title for the taxonomy.' ),

					'type'         => 'string',

					'context'      => array( 'view', 'edit', 'embed' ),

					'readonly'     => true,

				),

				'slug'             => array(

					'description'  => __( 'An alphanumeric identifier for the taxonomy.' ),

					'type'         => 'string',

					'context'      => array( 'view', 'edit', 'embed' ),

					'readonly'     => true,

				),

				'show_cloud'       => array(

					'description'  => __( 'Whether or not the term cloud should be displayed.' ),

					'type'         => 'boolean',

					'context'      => array( 'edit' ),

					'readonly'     => true,

				),

				'types'            => array(

					'description'  => __( 'Types associated with the taxonomy.' ),

					'type'         => 'array',

					'items'        => array(

						'type' => 'string',

					),

					'context'      => array( 'view', 'edit' ),

					'readonly'     => true,

				),

				'rest_base'            => array(

					'description'  => __( 'REST base route for the taxonomy.' ),

					'type'         => 'string',

					'context'      => array( 'view', 'edit', 'embed' ),

					'readonly'     => true,

				),

			),

		);

		return $this->add_additional_fields_schema( $schema );

	}

	/**

	 * Retrieves the query params for collections.

	 *

	 * @since 4.7.0

	 *

	 * @return array Collection parameters.

	 */

	public function get_collection_params() {

		$new_params = array();

		$new_params['context'] = $this->get_context_param( array( 'default' => 'view' ) );

		$new_params['type'] = array(

			'description'  => __( 'Limit results to taxonomies associated with a specific post type.' ),

			'type'         => 'string',

		);

		return $new_params;

	}

}