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<?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
*
* @see WP_REST_Controller
*/
class WP_REST_Revisions_Controller extends WP_REST_Controller {
/**
* Parent post type.
*
* @since 4.7.0
* @var string
*/
private $parent_post_type;
/**
* Instance of a revision meta fields object.
*
* @since 6.4.0
* @var WP_REST_Post_Meta_Fields
*/
protected $meta;
/**
* Parent controller.
*
* @since 4.7.0
* @var WP_REST_Controller
*/
private $parent_controller;
/**
* The base of the parent controller's route.
*
* @since 4.7.0
* @var string
*/
private $parent_base;
/**
* Constructor.
*
* @since 4.7.0
*
* @param string $parent_post_type Post type of the parent.
*/
public function __construct( $parent_post_type ) {
$this->parent_post_type = $parent_post_type;
$post_type_object = get_post_type_object( $parent_post_type );
$parent_controller = $post_type_object->get_rest_controller();
if ( ! $parent_controller ) {
$parent_controller = new WP_REST_Posts_Controller( $parent_post_type );
}
$this->parent_controller = $parent_controller;
$this->rest_base = 'revisions';
$this->parent_base = ! empty( $post_type_object->rest_base ) ? $post_type_object->rest_base : $post_type_object->name;
$this->namespace = ! empty( $post_type_object->rest_namespace ) ? $post_type_object->rest_namespace : 'wp/v2';
$this->meta = new WP_REST_Post_Meta_Fields( $parent_post_type );
}
/**
* Registers the routes for revisions based on post types supporting revisions.
*
* @since 4.7.0
*
* @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 revision.' ),
'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 revision.' ),
'type' => 'integer',
),
'id' => array(
'description' => __( 'Unique identifier for the revision.' ),
'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 $parent_post_id Supplied ID.
* @return WP_Post|WP_Error Post object if ID is valid, WP_Error otherwise.
*/
protected function get_parent( $parent_post_id ) {
$error = new WP_Error(
'rest_post_invalid_parent',
__( 'Invalid post parent ID.' ),
array( 'status' => 404 )
);
if ( (int) $parent_post_id <= 0 ) {
return $error;
}
$parent_post = get_post( (int) $parent_post_id );
if ( empty( $parent_post ) || empty( $parent_post->ID )
|| $this->parent_post_type !== $parent_post->post_type
) {
return $error;
}
return $parent_post;
}
/**
* Checks if a given request has access to get revisions.
*
* @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 ) {
$parent = $this->get_parent( $request['parent'] );
if ( is_wp_error( $parent ) ) {
return $parent;
}
if ( ! current_user_can( '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
*
* @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_items( $request ) {
$parent = $this->get_parent( $request['parent'] );
if ( is_wp_error( $parent ) ) {
return $parent;
}
// Ensure a search string is set in case the orderby is set to 'relevance'.
if ( ! empty( $request['orderby'] ) && 'relevance' === $request['orderby'] && empty( $request['search'] ) ) {
return new WP_Error(
'rest_no_search_term_defined',
__( 'You need to define a search term to order by relevance.' ),
array( 'status' => 400 )
);
}
// Ensure an include parameter is set in case the orderby is set to 'include'.
if ( ! empty( $request['orderby'] ) && 'include' === $request['orderby'] && empty( $request['include'] ) ) {
return new WP_Error(
'rest_orderby_include_missing_include',
__( 'You need to define an include parameter to order by include.' ),
array( 'status' => 400 )
);
}
if ( wp_revisions_enabled( $parent ) ) {
$registered = $this->get_collection_params();
$args = array(
'post_parent' => $parent->ID,
'post_type' => 'revision',
'post_status' => 'inherit',
'posts_per_page' => -1,
'orderby' => 'date ID',
'order' => 'DESC',
'suppress_filters' => true,
);
$parameter_mappings = array(
'exclude' => 'post__not_in',
'include' => 'post__in',
'offset' => 'offset',
'order' => 'order',
'orderby' => 'orderby',
'page' => 'paged',
'per_page' => 'posts_per_page',
'search' => 's',
);
foreach ( $parameter_mappings as $api_param => $wp_param ) {
if ( isset( $registered[ $api_param ], $request[ $api_param ] ) ) {
$args[ $wp_param ] = $request[ $api_param ];
}
}
// For backward-compatibility, 'date' needs to resolve to 'date ID'.
if ( isset( $args['orderby'] ) && 'date' === $args['orderby'] ) {
$args['orderby'] = 'date ID';
}
/** This filter is documented in wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php */
$args = apply_filters( 'rest_revision_query', $args, $request );
$query_args = $this->prepare_items_query( $args, $request );
$revisions_query = new WP_Query();
$revisions = $revisions_query->query( $query_args );
$offset = isset( $query_args['offset'] ) ? (int) $query_args['offset'] : 0;
$page = (int) $query_args['paged'];
$total_revisions = $revisions_query->found_posts;
if ( $total_revisions < 1 ) {
// Out-of-bounds, run the query again without LIMIT for total count.
unset( $query_args['paged'], $query_args['offset'] );
$count_query = new WP_Query();
$count_query->query( $query_args );
$total_revisions = $count_query->found_posts;
}
if ( $revisions_query->query_vars['posts_per_page'] > 0 ) {
$max_pages = (int) ceil( $total_revisions / (int) $revisions_query->query_vars['posts_per_page'] );
} else {
$max_pages = $total_revisions > 0 ? 1 : 0;
}
if ( $total_revisions > 0 ) {
if ( $offset >= $total_revisions ) {
return new WP_Error(
'rest_revision_invalid_offset_number',
__( 'The offset number requested is larger than or equal to the number of available revisions.' ),
array( 'status' => 400 )
);
} elseif ( ! $offset && $page > $max_pages ) {
return new WP_Error(
'rest_revision_invalid_page_number',
__( 'The page number requested is larger than the number of pages available.' ),
array( 'status' => 400 )
);
}
}
} else {
$revisions = array();
$total_revisions = 0;
$max_pages = 0;
$page = (int) $request['page'];
}
$response = array();
foreach ( $revisions as $revision ) {
$data = $this->prepare_item_for_response( $revision, $request );
$response[] = $this->prepare_response_for_collection( $data );
}
$response = rest_ensure_response( $response );
$response->header( 'X-WP-Total', (int) $total_revisions );
$response->header( 'X-WP-TotalPages', (int) $max_pages );
$request_params = $request->get_query_params();
$base_path = rest_url( sprintf( '%s/%s/%d/%s', $this->namespace, $this->parent_base, $request['parent'], $this->rest_base ) );
$base = add_query_arg( urlencode_deep( $request_params ), $base_path );
if ( $page > 1 ) {
$prev_page = $page - 1;
if ( $prev_page > $max_pages ) {
$prev_page = $max_pages;
}
$prev_link = add_query_arg( 'page', $prev_page, $base );
$response->link_header( 'prev', $prev_link );
}
if ( $max_pages > $page ) {
$next_page = $page + 1;
$next_link = add_query_arg( 'page', $next_page, $base );
$response->link_header( 'next', $next_link );
}
return $response;
}
/**
* Checks if a given request has access to get a specific revision.
*
* @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, 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
* @since 6.5.0 Added a condition to check that parent id matches revision parent id.
*
* @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 ) {
$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;
}
if ( (int) $parent->ID !== (int) $revision->post_parent ) {
return new WP_Error(
'rest_revision_parent_id_mismatch',
/* translators: %d: A post id. */
sprintf( __( 'The revision does not belong to the specified parent with id of "%d"' ), $parent->ID ),
array( 'status' => 404 )
);
}
$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
*
* @param WP_REST_Request $request Full details about the request.
* @return true|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;
}
if ( ! current_user_can( 'delete_post', $parent->ID ) ) {
return new WP_Error(
'rest_cannot_delete',
__( 'Sorry, you are not allowed to delete revisions of this post.' ),
array( 'status' => rest_authorization_required_code() )
);
}
$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;
}
if ( ! current_user_can( 'delete_post', $revision->ID ) ) {
return new WP_Error(
'rest_cannot_delete',
__( 'Sorry, you are not allowed to delete this revision.' ),
array( 'status' => rest_authorization_required_code() )
);
}
return true;
}
/**
* Deletes a single revision.
*
* @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 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',
/* translators: %s: force=true */
sprintf( __( "Revisions do not support trashing. Set '%s' to delete." ), 'force=true' ),
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 WP_Post|false|null $result The revision object (if it was deleted or moved to the Trash successfully)
* or false or null (failure). If the revision was moved 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;
}
/**
* Determines the allowed query_vars for a get_items() response and prepares
* them for WP_Query.
*
* @since 5.0.0
*
* @param array $prepared_args Optional. Prepared WP_Query arguments. Default empty array.
* @param WP_REST_Request $request Optional. Full details about the request.
* @return array Items query arguments.
*/
protected function prepare_items_query( $prepared_args = array(), $request = null ) {
$query_args = array();
foreach ( $prepared_args as $key => $value ) {
/** This filter is documented in wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php */
$query_args[ $key ] = apply_filters( "rest_query_var-{$key}", $value ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
}
// Map to proper WP_Query orderby param.
if ( isset( $query_args['orderby'] ) && isset( $request['orderby'] ) ) {
$orderby_mappings = array(
'id' => 'ID',
'include' => 'post__in',
'slug' => 'post_name',
'include_slugs' => 'post_name__in',
);
if ( isset( $orderby_mappings[ $request['orderby'] ] ) ) {
$query_args['orderby'] = $orderby_mappings[ $request['orderby'] ];
}
}
return $query_args;
}
/**
* Prepares the revision for the REST response.
*
* @since 4.7.0
* @since 5.9.0 Renamed `$post` to `$item` to match parent class for PHP 8 named parameter support.
*
* @global WP_Post $post Global post object.
*
* @param WP_Post $item Post revision object.
* @param WP_REST_Request $request Request object.
* @return WP_REST_Response Response object.
*/
public function prepare_item_for_response( $item, $request ) {
// Restores the more descriptive, specific name for use within this method.
$post = $item;
$GLOBALS['post'] = $post;
setup_postdata( $post );
$fields = $this->get_fields_for_response( $request );
$data = array();
if ( in_array( 'author', $fields, true ) ) {
$data['author'] = (int) $post->post_author;
}
if ( in_array( 'date', $fields, true ) ) {
$data['date'] = $this->prepare_date_response( $post->post_date_gmt, $post->post_date );
}
if ( in_array( 'date_gmt', $fields, true ) ) {
$data['date_gmt'] = $this->prepare_date_response( $post->post_date_gmt );
}
if ( in_array( 'id', $fields, true ) ) {
$data['id'] = $post->ID;
}
if ( in_array( 'modified', $fields, true ) ) {
$data['modified'] = $this->prepare_date_response( $post->post_modified_gmt, $post->post_modified );
}
if ( in_array( 'modified_gmt', $fields, true ) ) {
$data['modified_gmt'] = $this->prepare_date_response( $post->post_modified_gmt );
}
if ( in_array( 'parent', $fields, true ) ) {
$data['parent'] = (int) $post->post_parent;
}
if ( in_array( 'slug', $fields, true ) ) {
$data['slug'] = $post->post_name;
}
if ( in_array( 'guid', $fields, true ) ) {
$data['guid'] = array(
/** This filter is documented in wp-includes/post-template.php */
'rendered' => apply_filters( 'get_the_guid', $post->guid, $post->ID ),
'raw' => $post->guid,
);
}
if ( in_array( 'title', $fields, true ) ) {
$data['title'] = array(
'raw' => $post->post_title,
'rendered' => get_the_title( $post->ID ),
);
}
if ( in_array( 'content', $fields, true ) ) {
$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 ( in_array( 'excerpt', $fields, true ) ) {
$data['excerpt'] = array(
'raw' => $post->post_excerpt,
'rendered' => $this->prepare_excerpt_response( $post->post_excerpt, $post ),
);
}
if ( rest_is_field_included( 'meta', $fields ) ) {
$data['meta'] = $this->meta->get_value( $post->ID, $request );
}
$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( rest_get_route_for_post( $data['parent'] ) ) );
}
/**
* Filters a revision returned from the REST 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
*
* @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
*
* @return array Item schema data.
*/
public function get_item_schema() {
if ( $this->schema ) {
return $this->add_additional_fields_schema( $this->schema );
}
$schema = array(
'$schema' => 'http://json-schema.org/draft-04/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 revision.' ),
'type' => 'integer',
'context' => array( 'view', 'edit', 'embed' ),
),
'date' => array(
'description' => __( "The date the revision was published, in the site's timezone." ),
'type' => 'string',
'format' => 'date-time',
'context' => array( 'view', 'edit', 'embed' ),
),
'date_gmt' => array(
'description' => __( 'The date the revision was published, as GMT.' ),
'type' => 'string',
'format' => 'date-time',
'context' => array( 'view', 'edit' ),
),
'guid' => array(
'description' => __( 'GUID for the revision, as it exists in the database.' ),
'type' => 'string',
'context' => array( 'view', 'edit' ),
),
'id' => array(
'description' => __( 'Unique identifier for the revision.' ),
'type' => 'integer',
'context' => array( 'view', 'edit', 'embed' ),
),
'modified' => array(
'description' => __( "The date the revision was last modified, in the site's timezone." ),
'type' => 'string',
'format' => 'date-time',
'context' => array( 'view', 'edit' ),
),
'modified_gmt' => array(
'description' => __( 'The date the revision was last modified, as GMT.' ),
'type' => 'string',
'format' => 'date-time',
'context' => array( 'view', 'edit' ),
),
'parent' => array(
'description' => __( 'The ID for the parent of the revision.' ),
'type' => 'integer',
'context' => array( 'view', 'edit', 'embed' ),
),
'slug' => array(
'description' => __( 'An alphanumeric identifier for the revision 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'];
}
$schema['properties']['meta'] = $this->meta->get_field_schema();
$this->schema = $schema;
return $this->add_additional_fields_schema( $this->schema );
}
/**
* Retrieves the query params for collections.
*
* @since 4.7.0
*
* @return array Collection parameters.
*/
public function get_collection_params() {
$query_params = parent::get_collection_params();
$query_params['context']['default'] = 'view';
unset( $query_params['per_page']['default'] );
$query_params['exclude'] = array(
'description' => __( 'Ensure result set excludes specific IDs.' ),
'type' => 'array',
'items' => array(
'type' => 'integer',
),
'default' => array(),
);
$query_params['include'] = array(
'description' => __( 'Limit result set to specific IDs.' ),
'type' => 'array',
'items' => array(
'type' => 'integer',
),
'default' => array(),
);
$query_params['offset'] = array(
'description' => __( 'Offset the result set by a specific number of items.' ),
'type' => 'integer',
);
$query_params['order'] = array(
'description' => __( 'Order sort attribute ascending or descending.' ),
'type' => 'string',
'default' => 'desc',
'enum' => array( 'asc', 'desc' ),
);
$query_params['orderby'] = array(
'description' => __( 'Sort collection by object attribute.' ),
'type' => 'string',
'default' => 'date',
'enum' => array(
'date',
'id',
'include',
'relevance',
'slug',
'include_slugs',
'title',
),
);
return $query_params;
}
/**
* Checks the post excerpt and prepare it for single post output.
*
* @since 4.7.0
*
* @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;
}
}