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   1  <?php
   2  /**
   3   * REST API: WP_REST_Post_Types_Controller class
   4   *
   5   * @package WordPress
   6   * @subpackage REST_API
   7   * @since 4.7.0
   8   */
   9  
  10  /**
  11   * Core class to access post types via the REST API.
  12   *
  13   * @since 4.7.0
  14   *
  15   * @see WP_REST_Controller
  16   */
  17  class WP_REST_Post_Types_Controller extends WP_REST_Controller {
  18  
  19      /**
  20       * Constructor.
  21       *
  22       * @since 4.7.0
  23       */
  24  	public function __construct() {
  25          $this->namespace = 'wp/v2';
  26          $this->rest_base = 'types';
  27      }
  28  
  29      /**
  30       * Registers the routes for the objects of the controller.
  31       *
  32       * @since 4.7.0
  33       *
  34       * @see register_rest_route()
  35       */
  36  	public function register_routes() {
  37  
  38          register_rest_route(
  39              $this->namespace,
  40              '/' . $this->rest_base,
  41              array(
  42                  array(
  43                      'methods'             => WP_REST_Server::READABLE,
  44                      'callback'            => array( $this, 'get_items' ),
  45                      'permission_callback' => array( $this, 'get_items_permissions_check' ),
  46                      'args'                => $this->get_collection_params(),
  47                  ),
  48                  'schema' => array( $this, 'get_public_item_schema' ),
  49              )
  50          );
  51  
  52          register_rest_route(
  53              $this->namespace,
  54              '/' . $this->rest_base . '/(?P<type>[\w-]+)',
  55              array(
  56                  'args'   => array(
  57                      'type' => array(
  58                          'description' => __( 'An alphanumeric identifier for the post type.' ),
  59                          'type'        => 'string',
  60                      ),
  61                  ),
  62                  array(
  63                      'methods'             => WP_REST_Server::READABLE,
  64                      'callback'            => array( $this, 'get_item' ),
  65                      'permission_callback' => '__return_true',
  66                      'args'                => array(
  67                          'context' => $this->get_context_param( array( 'default' => 'view' ) ),
  68                      ),
  69                  ),
  70                  'schema' => array( $this, 'get_public_item_schema' ),
  71              )
  72          );
  73      }
  74  
  75      /**
  76       * Checks whether a given request has permission to read types.
  77       *
  78       * @since 4.7.0
  79       *
  80       * @param WP_REST_Request $request Full details about the request.
  81       * @return true|WP_Error True if the request has read access, WP_Error object otherwise.
  82       */
  83  	public function get_items_permissions_check( $request ) {
  84          if ( 'edit' === $request['context'] ) {
  85              $types = get_post_types( array( 'show_in_rest' => true ), 'objects' );
  86  
  87              foreach ( $types as $type ) {
  88                  if ( current_user_can( $type->cap->edit_posts ) ) {
  89                      return true;
  90                  }
  91              }
  92  
  93              return new WP_Error(
  94                  'rest_cannot_view',
  95                  __( 'Sorry, you are not allowed to edit posts in this post type.' ),
  96                  array( 'status' => rest_authorization_required_code() )
  97              );
  98          }
  99  
 100          return true;
 101      }
 102  
 103      /**
 104       * Retrieves all public post types.
 105       *
 106       * @since 4.7.0
 107       *
 108       * @param WP_REST_Request $request Full details about the request.
 109       * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
 110       */
 111  	public function get_items( $request ) {
 112          $data  = array();
 113          $types = get_post_types( array( 'show_in_rest' => true ), 'objects' );
 114  
 115          foreach ( $types as $type ) {
 116              if ( 'edit' === $request['context'] && ! current_user_can( $type->cap->edit_posts ) ) {
 117                  continue;
 118              }
 119  
 120              $post_type           = $this->prepare_item_for_response( $type, $request );
 121              $data[ $type->name ] = $this->prepare_response_for_collection( $post_type );
 122          }
 123  
 124          return rest_ensure_response( $data );
 125      }
 126  
 127      /**
 128       * Retrieves a specific post type.
 129       *
 130       * @since 4.7.0
 131       *
 132       * @param WP_REST_Request $request Full details about the request.
 133       * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
 134       */
 135  	public function get_item( $request ) {
 136          $obj = get_post_type_object( $request['type'] );
 137  
 138          if ( empty( $obj ) ) {
 139              return new WP_Error(
 140                  'rest_type_invalid',
 141                  __( 'Invalid post type.' ),
 142                  array( 'status' => 404 )
 143              );
 144          }
 145  
 146          if ( empty( $obj->show_in_rest ) ) {
 147              return new WP_Error(
 148                  'rest_cannot_read_type',
 149                  __( 'Cannot view post type.' ),
 150                  array( 'status' => rest_authorization_required_code() )
 151              );
 152          }
 153  
 154          if ( 'edit' === $request['context'] && ! current_user_can( $obj->cap->edit_posts ) ) {
 155              return new WP_Error(
 156                  'rest_forbidden_context',
 157                  __( 'Sorry, you are not allowed to edit posts in this post type.' ),
 158                  array( 'status' => rest_authorization_required_code() )
 159              );
 160          }
 161  
 162          $data = $this->prepare_item_for_response( $obj, $request );
 163  
 164          return rest_ensure_response( $data );
 165      }
 166  
 167      /**
 168       * Prepares a post type object for serialization.
 169       *
 170       * @since 4.7.0
 171       *
 172       * @param WP_Post_Type    $post_type Post type object.
 173       * @param WP_REST_Request $request   Full details about the request.
 174       * @return WP_REST_Response Response object.
 175       */
 176  	public function prepare_item_for_response( $post_type, $request ) {
 177          $taxonomies = wp_list_filter( get_object_taxonomies( $post_type->name, 'objects' ), array( 'show_in_rest' => true ) );
 178          $taxonomies = wp_list_pluck( $taxonomies, 'name' );
 179          $base       = ! empty( $post_type->rest_base ) ? $post_type->rest_base : $post_type->name;
 180          $supports   = get_all_post_type_supports( $post_type->name );
 181  
 182          $fields = $this->get_fields_for_response( $request );
 183          $data   = array();
 184  
 185          if ( in_array( 'capabilities', $fields, true ) ) {
 186              $data['capabilities'] = $post_type->cap;
 187          }
 188  
 189          if ( in_array( 'description', $fields, true ) ) {
 190              $data['description'] = $post_type->description;
 191          }
 192  
 193          if ( in_array( 'hierarchical', $fields, true ) ) {
 194              $data['hierarchical'] = $post_type->hierarchical;
 195          }
 196  
 197          if ( in_array( 'viewable', $fields, true ) ) {
 198              $data['viewable'] = is_post_type_viewable( $post_type );
 199          }
 200  
 201          if ( in_array( 'labels', $fields, true ) ) {
 202              $data['labels'] = $post_type->labels;
 203          }
 204  
 205          if ( in_array( 'name', $fields, true ) ) {
 206              $data['name'] = $post_type->label;
 207          }
 208  
 209          if ( in_array( 'slug', $fields, true ) ) {
 210              $data['slug'] = $post_type->name;
 211          }
 212  
 213          if ( in_array( 'supports', $fields, true ) ) {
 214              $data['supports'] = $supports;
 215          }
 216  
 217          if ( in_array( 'taxonomies', $fields, true ) ) {
 218              $data['taxonomies'] = array_values( $taxonomies );
 219          }
 220  
 221          if ( in_array( 'rest_base', $fields, true ) ) {
 222              $data['rest_base'] = $base;
 223          }
 224  
 225          $context = ! empty( $request['context'] ) ? $request['context'] : 'view';
 226          $data    = $this->add_additional_fields_to_object( $data, $request );
 227          $data    = $this->filter_response_by_context( $data, $context );
 228  
 229          // Wrap the data in a response object.
 230          $response = rest_ensure_response( $data );
 231  
 232          $response->add_links(
 233              array(
 234                  'collection'              => array(
 235                      'href' => rest_url( sprintf( '%s/%s', $this->namespace, $this->rest_base ) ),
 236                  ),
 237                  'https://api.w.org/items' => array(
 238                      'href' => rest_url( sprintf( 'wp/v2/%s', $base ) ),
 239                  ),
 240              )
 241          );
 242  
 243          /**
 244           * Filters a post type returned from the REST API.
 245           *
 246           * Allows modification of the post type data right before it is returned.
 247           *
 248           * @since 4.7.0
 249           *
 250           * @param WP_REST_Response $response  The response object.
 251           * @param WP_Post_Type     $post_type The original post type object.
 252           * @param WP_REST_Request  $request   Request used to generate the response.
 253           */
 254          return apply_filters( 'rest_prepare_post_type', $response, $post_type, $request );
 255      }
 256  
 257      /**
 258       * Retrieves the post type's schema, conforming to JSON Schema.
 259       *
 260       * @since 4.7.0
 261       *
 262       * @return array Item schema data.
 263       */
 264  	public function get_item_schema() {
 265          if ( $this->schema ) {
 266              return $this->add_additional_fields_schema( $this->schema );
 267          }
 268  
 269          $schema = array(
 270              '$schema'    => 'http://json-schema.org/draft-04/schema#',
 271              'title'      => 'type',
 272              'type'       => 'object',
 273              'properties' => array(
 274                  'capabilities' => array(
 275                      'description' => __( 'All capabilities used by the post type.' ),
 276                      'type'        => 'object',
 277                      'context'     => array( 'edit' ),
 278                      'readonly'    => true,
 279                  ),
 280                  'description'  => array(
 281                      'description' => __( 'A human-readable description of the post type.' ),
 282                      'type'        => 'string',
 283                      'context'     => array( 'view', 'edit' ),
 284                      'readonly'    => true,
 285                  ),
 286                  'hierarchical' => array(
 287                      'description' => __( 'Whether or not the post type should have children.' ),
 288                      'type'        => 'boolean',
 289                      'context'     => array( 'view', 'edit' ),
 290                      'readonly'    => true,
 291                  ),
 292                  'viewable'     => array(
 293                      'description' => __( 'Whether or not the post type can be viewed.' ),
 294                      'type'        => 'boolean',
 295                      'context'     => array( 'edit' ),
 296                      'readonly'    => true,
 297                  ),
 298                  'labels'       => array(
 299                      'description' => __( 'Human-readable labels for the post type for various contexts.' ),
 300                      'type'        => 'object',
 301                      'context'     => array( 'edit' ),
 302                      'readonly'    => true,
 303                  ),
 304                  'name'         => array(
 305                      'description' => __( 'The title for the post type.' ),
 306                      'type'        => 'string',
 307                      'context'     => array( 'view', 'edit', 'embed' ),
 308                      'readonly'    => true,
 309                  ),
 310                  'slug'         => array(
 311                      'description' => __( 'An alphanumeric identifier for the post type.' ),
 312                      'type'        => 'string',
 313                      'context'     => array( 'view', 'edit', 'embed' ),
 314                      'readonly'    => true,
 315                  ),
 316                  'supports'     => array(
 317                      'description' => __( 'All features, supported by the post type.' ),
 318                      'type'        => 'object',
 319                      'context'     => array( 'edit' ),
 320                      'readonly'    => true,
 321                  ),
 322                  'taxonomies'   => array(
 323                      'description' => __( 'Taxonomies associated with post type.' ),
 324                      'type'        => 'array',
 325                      'items'       => array(
 326                          'type' => 'string',
 327                      ),
 328                      'context'     => array( 'view', 'edit' ),
 329                      'readonly'    => true,
 330                  ),
 331                  'rest_base'    => array(
 332                      'description' => __( 'REST base route for the post type.' ),
 333                      'type'        => 'string',
 334                      'context'     => array( 'view', 'edit', 'embed' ),
 335                      'readonly'    => true,
 336                  ),
 337              ),
 338          );
 339  
 340          $this->schema = $schema;
 341  
 342          return $this->add_additional_fields_schema( $this->schema );
 343      }
 344  
 345      /**
 346       * Retrieves the query params for collections.
 347       *
 348       * @since 4.7.0
 349       *
 350       * @return array Collection parameters.
 351       */
 352  	public function get_collection_params() {
 353          return array(
 354              'context' => $this->get_context_param( array( 'default' => 'view' ) ),
 355          );
 356      }
 357  
 358  }