<?php
/**
* REST API: WP_REST_Revisions_Controller class
*
* @package WordPress
* @subpackage REST_API
* @since 4.7.0
*/
/**
* Core class used to access revisions via the REST API.
*
* @since 4.7.0
*0
* @see WP_REST_Controller
*/
class WP_REST_Revisions_Controller extends WP_REST_Controller {
/**
* Parent post type.
*
* @since 4.7.0
* @access private
* @var string
*/
private $parent_post_type;
/**
* Parent controller.
*
* @since 4.7.0
* @access private
* @var WP_REST_Controller
*/
private $parent_controller;
/**
* The base of the parent controller's route.
*
* @since 4.7.0
* @access private
* @var string
*/
private $parent_base;
/**
* Constructor.
*
* @since 4.7.0
* @access public
*
* @param string $parent_post_type Post type of the parent.
*/
public function __construct( $parent_post_type ) {
$this->parent_post_type = $parent_post_type;
$this->parent_controller = new WP_REST_Posts_Controller( $parent_post_type );
$this->namespace = 'wp/v2';
$this->rest_base = 'revisions';
$post_type_object = get_post_type_object( $parent_post_type );
$this->parent_base = ! empty( $post_type_object->rest_base ) ? $post_type_object->rest_base : $post_type_object->name;
}
/**
* Registers routes for revisions based on post types supporting revisions.
*
* @since 4.7.0
* @access public
*
* @see register_rest_route()
*/
public function register_routes() {
register_rest_route( $this->namespace, '/' . $this->parent_base . '/(?P<parent>[\d]+)/' . $this->rest_base, array(
'args' => array(
'parent' => array(
'description' => __( 'The ID for the parent of the object.' ),
'type' => 'integer',
),
),
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->parent_base . '/(?P<parent>[\d]+)/' . $this->rest_base . '/(?P<id>[\d]+)', array(
'args' => array(
'parent' => array(
'description' => __( 'The ID for the parent of the object.' ),
'type' => 'integer',
),
'id' => array(
'description' => __( 'Unique identifier for the object.' ),
'type' => 'integer',
),
),
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' ) ),
),
),
array(
'methods' => WP_REST_Server::DELETABLE,
'callback' => array( $this, 'delete_item' ),
'permission_callback' => array( $this, 'delete_item_permissions_check' ),
'args' => array(
'force' => array(
'type' => 'boolean',
'default' => false,
'description' => __( 'Required to be true, as revisions do not support trashing.' ),
),
),
),
'schema' => array( $this, 'get_public_item_schema' ),
));
}
/**
* Get the parent post, if the ID is valid.
*
* @since 4.7.2
*
* @param int $id Supplied ID.
* @return WP_Post|WP_Error Post object if ID is valid, WP_Error otherwise.
*/
protected function get_parent( $parent ) {
$error = new WP_Error( 'rest_post_invalid_parent', __( 'Invalid post parent ID.' ), array( 'status' => 404 ) );
if ( (int) $parent <= 0 ) {
return $error;
}
$parent = get_post( (int) $parent );
if ( empty( $parent ) || empty( $parent->ID ) || $this->parent_post_type !== $parent->post_type ) {
return $error;
}
return $parent;
}
/**
* Checks if a given request has access to get revisions.
*
* @since 4.7.0
* @access public
*
* @param WP_REST_Request $request Full data 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 ) {
$parent = $this->get_parent( $request['parent'] );
if ( is_wp_error( $parent ) ) {
return $parent;
}
$parent_post_type_obj = get_post_type_object( $parent->post_type );
if ( ! current_user_can( $parent_post_type_obj->cap->edit_post, $parent->ID ) ) {
return new WP_Error( 'rest_cannot_read', __( 'Sorry, you are not allowed to view revisions of this post.' ), array( 'status' => rest_authorization_required_code() ) );
}
return true;
}
/**
* Get the revision, if the ID is valid.
*
* @since 4.7.2
*
* @param int $id Supplied ID.
* @return WP_Post|WP_Error Revision post object if ID is valid, WP_Error otherwise.
*/
protected function get_revision( $id ) {
$error = new WP_Error( 'rest_post_invalid_id', __( 'Invalid revision ID.' ), array( 'status' => 404 ) );
if ( (int) $id <= 0 ) {
return $error;
}
$revision = get_post( (int) $id );
if ( empty( $revision ) || empty( $revision->ID ) || 'revision' !== $revision->post_type ) {
return $error;
}
return $revision;
}
/**
* Gets a collection of revisions.
*
* @since 4.7.0
* @access public
*
* @param WP_REST_Request $request Full data about the request.
* @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
*/
public function get_items( $request ) {
$parent = $this->get_parent( $request['parent'] );
if ( is_wp_error( $parent ) ) {
return $parent;
}
$revisions = wp_get_post_revisions( $request['parent'] );
$response = array();
foreach ( $revisions as $revision ) {
$data = $this->prepare_item_for_response( $revision, $request );
$response[] = $this->prepare_response_for_collection( $data );
}
return rest_ensure_response( $response );
}
/**
* Checks if a given request has access to get a specific revision.
*
* @since 4.7.0
* @access public
*
* @param WP_REST_Request $request Full data about the request.
* @return bool|WP_Error True if the request has read access for the item, WP_Error object otherwise.
*/
public function get_item_permissions_check( $request ) {
return $this->get_items_permissions_check( $request );
}
/**
* Retrieves one revision from the collection.
*
* @since 4.7.0
* @access public
*
* @param WP_REST_Request $request Full data about the request.
* @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
*/
public function get_item( $request ) {
$parent = $this->get_parent( $request['parent'] );
if ( is_wp_error( $parent ) ) {
return $parent;
}
$revision = $this->get_revision( $request['id'] );
if ( is_wp_error( $revision ) ) {
return $revision;
}
$response = $this->prepare_item_for_response( $revision, $request );
return rest_ensure_response( $response );
}
/**
* Checks if a given request has access to delete a revision.
*
* @since 4.7.0
* @access public
*
* @param WP_REST_Request $request Full details about the request.
* @return bool|WP_Error True if the request has access to delete the item, WP_Error object otherwise.
*/
public function delete_item_permissions_check( $request ) {
$parent = $this->get_parent( $request['parent'] );
if ( is_wp_error( $parent ) ) {
return $parent;
}
$revision = $this->get_revision( $request['id'] );
if ( is_wp_error( $revision ) ) {
return $revision;
}
$response = $this->get_items_permissions_check( $request );
if ( ! $response || is_wp_error( $response ) ) {
return $response;
}
$post_type = get_post_type_object( 'revision' );
return current_user_can( $post_type->cap->delete_post, $revision->ID );
}
/**
* Deletes a single revision.
*
* @since 4.7.0
* @access public
*
* @param WP_REST_Request $request Full details about the request.
* @return true|WP_Error True on success, or WP_Error object on failure.
*/
public function delete_item( $request ) {
$revision = $this->get_revision( $request['id'] );
if ( is_wp_error( $revision ) ) {
return $revision;
}
$force = isset( $request['force'] ) ? (bool) $request['force'] : false;
// We don't support trashing for revisions.
if ( ! $force ) {
return new WP_Error( 'rest_trash_not_supported', __( 'Revisions do not support trashing. Set force=true to delete.' ), array( 'status' => 501 ) );
}
$previous = $this->prepare_item_for_response( $revision, $request );
$result = wp_delete_post( $request['id'], true );
/**
* Fires after a revision is deleted via the REST API.
*
* @since 4.7.0
*
* @param (mixed) $result The revision object (if it was deleted or moved to the trash successfully)
* or false (failure). If the revision was moved to to the trash, $result represents
* its new state; if it was deleted, $result represents its state before deletion.
* @param WP_REST_Request $request The request sent to the API.
*/
do_action( 'rest_delete_revision', $result, $request );
if ( ! $result ) {
return new WP_Error( 'rest_cannot_delete', __( 'The post cannot be deleted.' ), array( 'status' => 500 ) );
}
$response = new WP_REST_Response();
$response->set_data( array( 'deleted' => true, 'previous' => $previous->get_data() ) );
return $response;
}
/**
* Prepares the revision for the REST response.
*
* @since 4.7.0
* @access public
*
* @param WP_Post $post Post revision object.
* @param WP_REST_Request $request Request object.
* @return WP_REST_Response Response object.
*/
public function prepare_item_for_response( $post, $request ) {
$schema = $this->get_item_schema();
$data = array();
if ( ! empty( $schema['properties']['author'] ) ) {
$data['author'] = (int) $post->post_author;
}
if ( ! empty( $schema['properties']['date'] ) ) {
$data['date'] = $this->prepare_date_response( $post->post_date_gmt, $post->post_date );
}
if ( ! empty( $schema['properties']['date_gmt'] ) ) {
$data['date_gmt'] = $this->prepare_date_response( $post->post_date_gmt );
}
if ( ! empty( $schema['properties']['id'] ) ) {
$data['id'] = $post->ID;
}
if ( ! empty( $schema['properties']['modified'] ) ) {
$data['modified'] = $this->prepare_date_response( $post->post_modified_gmt, $post->post_modified );
}
if ( ! empty( $schema['properties']['modified_gmt'] ) ) {
$data['modified_gmt'] = $this->prepare_date_response( $post->post_modified_gmt );
}
if ( ! empty( $schema['properties']['parent'] ) ) {
$data['parent'] = (int) $post->post_parent;
}
if ( ! empty( $schema['properties']['slug'] ) ) {
$data['slug'] = $post->post_name;
}
if ( ! empty( $schema['properties']['guid'] ) ) {
$data['guid'] = array(
/** This filter is documented in wp-includes/post-template.php */
'rendered' => apply_filters( 'get_the_guid', $post->guid ),
'raw' => $post->guid,
);
}
if ( ! empty( $schema['properties']['title'] ) ) {
$data['title'] = array(
'raw' => $post->post_title,
'rendered' => get_the_title( $post->ID ),
);
}
if ( ! empty( $schema['properties']['content'] ) ) {
$data['content'] = array(
'raw' => $post->post_content,
/** This filter is documented in wp-includes/post-template.php */
'rendered' => apply_filters( 'the_content', $post->post_content ),
);
}
if ( ! empty( $schema['properties']['excerpt'] ) ) {
$data['excerpt'] = array(
'raw' => $post->post_excerpt,
'rendered' => $this->prepare_excerpt_response( $post->post_excerpt, $post ),
);
}
$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
$data = $this->add_additional_fields_to_object( $data, $request );
$data = $this->filter_response_by_context( $data, $context );
$response = rest_ensure_response( $data );
if ( ! empty( $data['parent'] ) ) {
$response->add_link( 'parent', rest_url( sprintf( '%s/%s/%d', $this->namespace, $this->parent_base, $data['parent'] ) ) );
}
/**
* Filters a revision returned from the API.
*
* Allows modification of the revision right before it is returned.
*
* @since 4.7.0
*
* @param WP_REST_Response $response The response object.
* @param WP_Post $post The original revision object.
* @param WP_REST_Request $request Request used to generate the response.
*/
return apply_filters( 'rest_prepare_revision', $response, $post, $request );
}
/**
* Checks the post_date_gmt or modified_gmt and prepare any post or
* modified date for single post output.
*
* @since 4.7.0
* @access protected
*
* @param string $date_gmt GMT publication time.
* @param string|null $date Optional. Local publication time. Default null.
* @return string|null ISO8601/RFC3339 formatted datetime, otherwise null.
*/
protected function prepare_date_response( $date_gmt, $date = null ) {
if ( '0000-00-00 00:00:00' === $date_gmt ) {
return null;
}
if ( isset( $date ) ) {
return mysql_to_rfc3339( $date );
}
return mysql_to_rfc3339( $date_gmt );
}
/**
* Retrieves the revision's schema, conforming to JSON Schema.
*
* @since 4.7.0
* @access public
*
* @return array Item schema data.
*/
public function get_item_schema() {
$schema = array(
'$schema' => 'http://json-schema.org/schema#',
'title' => "{$this->parent_post_type}-revision",
'type' => 'object',
// Base properties for every Revision.
'properties' => array(
'author' => array(
'description' => __( 'The ID for the author of the object.' ),
'type' => 'integer',
'context' => array( 'view', 'edit', 'embed' ),
),
'date' => array(
'description' => __( "The date the object was published, in the site's timezone." ),
'type' => 'string',
'format' => 'date-time',
'context' => array( 'view', 'edit', 'embed' ),
),
'date_gmt' => array(
'description' => __( 'The date the object was published, as GMT.' ),
'type' => 'string',
'format' => 'date-time',
'context' => array( 'view', 'edit' ),
),
'guid' => array(
'description' => __( 'GUID for the object, as it exists in the database.' ),
'type' => 'string',
'context' => array( 'view', 'edit' ),
),
'id' => array(
'description' => __( 'Unique identifier for the object.' ),
'type' => 'integer',
'context' => array( 'view', 'edit', 'embed' ),
),
'modified' => array(
'description' => __( "The date the object was last modified, in the site's timezone." ),
'type' => 'string',
'format' => 'date-time',
'context' => array( 'view', 'edit' ),
),
'modified_gmt' => array(
'description' => __( 'The date the object was last modified, as GMT.' ),
'type' => 'string',
'format' => 'date-time',
'context' => array( 'view', 'edit' ),
),
'parent' => array(
'description' => __( 'The ID for the parent of the object.' ),
'type' => 'integer',
'context' => array( 'view', 'edit', 'embed' ),
),
'slug' => array(
'description' => __( 'An alphanumeric identifier for the object unique to its type.' ),
'type' => 'string',
'context' => array( 'view', 'edit', 'embed' ),
),
),
);
$parent_schema = $this->parent_controller->get_item_schema();
if ( ! empty( $parent_schema['properties']['title'] ) ) {
$schema['properties']['title'] = $parent_schema['properties']['title'];
}
if ( ! empty( $parent_schema['properties']['content'] ) ) {
$schema['properties']['content'] = $parent_schema['properties']['content'];
}
if ( ! empty( $parent_schema['properties']['excerpt'] ) ) {
$schema['properties']['excerpt'] = $parent_schema['properties']['excerpt'];
}
if ( ! empty( $parent_schema['properties']['guid'] ) ) {
$schema['properties']['guid'] = $parent_schema['properties']['guid'];
}
return $this->add_additional_fields_schema( $schema );
}
/**
* Retrieves the query params for collections.
*
* @since 4.7.0
* @access public
*
* @return array Collection parameters.
*/
public function get_collection_params() {
return array(
'context' => $this->get_context_param( array( 'default' => 'view' ) ),
);
}
/**
* Checks the post excerpt and prepare it for single post output.
*
* @since 4.7.0
* @access protected
*
* @param string $excerpt The post excerpt.
* @param WP_Post $post Post revision object.
* @return string Prepared excerpt or empty string.
*/
protected function prepare_excerpt_response( $excerpt, $post ) {
/** This filter is documented in wp-includes/post-template.php */
$excerpt = apply_filters( 'the_excerpt', $excerpt, $post );
if ( empty( $excerpt ) ) {
return '';
}
return $excerpt;
}
}