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   1  <?php
   2  /**
   3   * REST API: WP_REST_Taxonomies_Controller class
   4   *
   5   * @package WordPress
   6   * @subpackage REST_API
   7   * @since 4.7.0
   8   */
   9  
  10  /**
  11   * Core class used to manage taxonomies via the REST API.
  12   *
  13   * @since 4.7.0
  14   *
  15   * @see WP_REST_Controller
  16   */
  17  class WP_REST_Taxonomies_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 = 'taxonomies';
  27      }
  28  
  29      /**
  30       * Registers the routes for taxonomies.
  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<taxonomy>[\w-]+)',
  55              array(
  56                  'args'   => array(
  57                      'taxonomy' => array(
  58                          'description' => __( 'An alphanumeric identifier for the taxonomy.' ),
  59                          'type'        => 'string',
  60                      ),
  61                  ),
  62                  array(
  63                      'methods'             => WP_REST_Server::READABLE,
  64                      'callback'            => array( $this, 'get_item' ),
  65                      'permission_callback' => array( $this, 'get_item_permissions_check' ),
  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 taxonomies.
  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              if ( ! empty( $request['type'] ) ) {
  86                  $taxonomies = get_object_taxonomies( $request['type'], 'objects' );
  87              } else {
  88                  $taxonomies = get_taxonomies( '', 'objects' );
  89              }
  90  
  91              foreach ( $taxonomies as $taxonomy ) {
  92                  if ( ! empty( $taxonomy->show_in_rest ) && current_user_can( $taxonomy->cap->assign_terms ) ) {
  93                      return true;
  94                  }
  95              }
  96  
  97              return new WP_Error(
  98                  'rest_cannot_view',
  99                  __( 'Sorry, you are not allowed to manage terms in this taxonomy.' ),
 100                  array( 'status' => rest_authorization_required_code() )
 101              );
 102          }
 103  
 104          return true;
 105      }
 106  
 107      /**
 108       * Retrieves all public taxonomies.
 109       *
 110       * @since 4.7.0
 111       *
 112       * @param WP_REST_Request $request Full details about the request.
 113       * @return WP_REST_Response Response object on success, or WP_Error object on failure.
 114       */
 115  	public function get_items( $request ) {
 116  
 117          // Retrieve the list of registered collection query parameters.
 118          $registered = $this->get_collection_params();
 119  
 120          if ( isset( $registered['type'] ) && ! empty( $request['type'] ) ) {
 121              $taxonomies = get_object_taxonomies( $request['type'], 'objects' );
 122          } else {
 123              $taxonomies = get_taxonomies( '', 'objects' );
 124          }
 125  
 126          $data = array();
 127  
 128          foreach ( $taxonomies as $tax_type => $value ) {
 129              if ( empty( $value->show_in_rest ) || ( 'edit' === $request['context'] && ! current_user_can( $value->cap->assign_terms ) ) ) {
 130                  continue;
 131              }
 132  
 133              $tax               = $this->prepare_item_for_response( $value, $request );
 134              $tax               = $this->prepare_response_for_collection( $tax );
 135              $data[ $tax_type ] = $tax;
 136          }
 137  
 138          if ( empty( $data ) ) {
 139              // Response should still be returned as a JSON object when it is empty.
 140              $data = (object) $data;
 141          }
 142  
 143          return rest_ensure_response( $data );
 144      }
 145  
 146      /**
 147       * Checks if a given request has access to a taxonomy.
 148       *
 149       * @since 4.7.0
 150       *
 151       * @param WP_REST_Request $request Full details about the request.
 152       * @return true|WP_Error True if the request has read access for the item, otherwise false or WP_Error object.
 153       */
 154  	public function get_item_permissions_check( $request ) {
 155  
 156          $tax_obj = get_taxonomy( $request['taxonomy'] );
 157  
 158          if ( $tax_obj ) {
 159              if ( empty( $tax_obj->show_in_rest ) ) {
 160                  return false;
 161              }
 162  
 163              if ( 'edit' === $request['context'] && ! current_user_can( $tax_obj->cap->assign_terms ) ) {
 164                  return new WP_Error(
 165                      'rest_forbidden_context',
 166                      __( 'Sorry, you are not allowed to manage terms in this taxonomy.' ),
 167                      array( 'status' => rest_authorization_required_code() )
 168                  );
 169              }
 170          }
 171  
 172          return true;
 173      }
 174  
 175      /**
 176       * Retrieves a specific taxonomy.
 177       *
 178       * @since 4.7.0
 179       *
 180       * @param WP_REST_Request $request Full details about the request.
 181       * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
 182       */
 183  	public function get_item( $request ) {
 184          $tax_obj = get_taxonomy( $request['taxonomy'] );
 185  
 186          if ( empty( $tax_obj ) ) {
 187              return new WP_Error(
 188                  'rest_taxonomy_invalid',
 189                  __( 'Invalid taxonomy.' ),
 190                  array( 'status' => 404 )
 191              );
 192          }
 193  
 194          $data = $this->prepare_item_for_response( $tax_obj, $request );
 195  
 196          return rest_ensure_response( $data );
 197      }
 198  
 199      /**
 200       * Prepares a taxonomy object for serialization.
 201       *
 202       * @since 4.7.0
 203       * @since 5.9.0 Renamed `$taxonomy` to `$item` to match parent class for PHP 8 named parameter support.
 204       *
 205       * @param WP_Taxonomy     $item    Taxonomy data.
 206       * @param WP_REST_Request $request Full details about the request.
 207       * @return WP_REST_Response Response object.
 208       */
 209  	public function prepare_item_for_response( $item, $request ) {
 210          // Restores the more descriptive, specific name for use within this method.
 211          $taxonomy = $item;
 212  
 213          $base = ! empty( $taxonomy->rest_base ) ? $taxonomy->rest_base : $taxonomy->name;
 214  
 215          $fields = $this->get_fields_for_response( $request );
 216          $data   = array();
 217  
 218          if ( in_array( 'name', $fields, true ) ) {
 219              $data['name'] = $taxonomy->label;
 220          }
 221  
 222          if ( in_array( 'slug', $fields, true ) ) {
 223              $data['slug'] = $taxonomy->name;
 224          }
 225  
 226          if ( in_array( 'capabilities', $fields, true ) ) {
 227              $data['capabilities'] = $taxonomy->cap;
 228          }
 229  
 230          if ( in_array( 'description', $fields, true ) ) {
 231              $data['description'] = $taxonomy->description;
 232          }
 233  
 234          if ( in_array( 'labels', $fields, true ) ) {
 235              $data['labels'] = $taxonomy->labels;
 236          }
 237  
 238          if ( in_array( 'types', $fields, true ) ) {
 239              $data['types'] = array_values( $taxonomy->object_type );
 240          }
 241  
 242          if ( in_array( 'show_cloud', $fields, true ) ) {
 243              $data['show_cloud'] = $taxonomy->show_tagcloud;
 244          }
 245  
 246          if ( in_array( 'hierarchical', $fields, true ) ) {
 247              $data['hierarchical'] = $taxonomy->hierarchical;
 248          }
 249  
 250          if ( in_array( 'rest_base', $fields, true ) ) {
 251              $data['rest_base'] = $base;
 252          }
 253  
 254          if ( in_array( 'rest_namespace', $fields, true ) ) {
 255              $data['rest_namespace'] = $taxonomy->rest_namespace;
 256          }
 257  
 258          if ( in_array( 'visibility', $fields, true ) ) {
 259              $data['visibility'] = array(
 260                  'public'             => (bool) $taxonomy->public,
 261                  'publicly_queryable' => (bool) $taxonomy->publicly_queryable,
 262                  'show_admin_column'  => (bool) $taxonomy->show_admin_column,
 263                  'show_in_nav_menus'  => (bool) $taxonomy->show_in_nav_menus,
 264                  'show_in_quick_edit' => (bool) $taxonomy->show_in_quick_edit,
 265                  'show_ui'            => (bool) $taxonomy->show_ui,
 266              );
 267          }
 268  
 269          $context = ! empty( $request['context'] ) ? $request['context'] : 'view';
 270          $data    = $this->add_additional_fields_to_object( $data, $request );
 271          $data    = $this->filter_response_by_context( $data, $context );
 272  
 273          // Wrap the data in a response object.
 274          $response = rest_ensure_response( $data );
 275  
 276          if ( rest_is_field_included( '_links', $fields ) || rest_is_field_included( '_embedded', $fields ) ) {
 277              $response->add_links( $this->prepare_links( $taxonomy ) );
 278          }
 279  
 280          /**
 281           * Filters a taxonomy returned from the REST API.
 282           *
 283           * Allows modification of the taxonomy data right before it is returned.
 284           *
 285           * @since 4.7.0
 286           *
 287           * @param WP_REST_Response $response The response object.
 288           * @param WP_Taxonomy      $item     The original taxonomy object.
 289           * @param WP_REST_Request  $request  Request used to generate the response.
 290           */
 291          return apply_filters( 'rest_prepare_taxonomy', $response, $taxonomy, $request );
 292      }
 293  
 294      /**
 295       * Prepares links for the request.
 296       *
 297       * @since 6.1.0
 298       *
 299       * @param WP_Taxonomy $taxonomy The taxonomy.
 300       * @return array Links for the given taxonomy.
 301       */
 302  	protected function prepare_links( $taxonomy ) {
 303          return array(
 304              'collection'              => array(
 305                  'href' => rest_url( sprintf( '%s/%s', $this->namespace, $this->rest_base ) ),
 306              ),
 307              'https://api.w.org/items' => array(
 308                  'href' => rest_url( rest_get_route_for_taxonomy_items( $taxonomy->name ) ),
 309              ),
 310          );
 311      }
 312  
 313      /**
 314       * Retrieves the taxonomy's schema, conforming to JSON Schema.
 315       *
 316       * @since 4.7.0
 317       * @since 5.0.0 The `visibility` property was added.
 318       * @since 5.9.0 The `rest_namespace` property was added.
 319       *
 320       * @return array Item schema data.
 321       */
 322  	public function get_item_schema() {
 323          if ( $this->schema ) {
 324              return $this->add_additional_fields_schema( $this->schema );
 325          }
 326  
 327          $schema = array(
 328              '$schema'    => 'http://json-schema.org/draft-04/schema#',
 329              'title'      => 'taxonomy',
 330              'type'       => 'object',
 331              'properties' => array(
 332                  'capabilities'   => array(
 333                      'description' => __( 'All capabilities used by the taxonomy.' ),
 334                      'type'        => 'object',
 335                      'context'     => array( 'edit' ),
 336                      'readonly'    => true,
 337                  ),
 338                  'description'    => array(
 339                      'description' => __( 'A human-readable description of the taxonomy.' ),
 340                      'type'        => 'string',
 341                      'context'     => array( 'view', 'edit' ),
 342                      'readonly'    => true,
 343                  ),
 344                  'hierarchical'   => array(
 345                      'description' => __( 'Whether or not the taxonomy should have children.' ),
 346                      'type'        => 'boolean',
 347                      'context'     => array( 'view', 'edit' ),
 348                      'readonly'    => true,
 349                  ),
 350                  'labels'         => array(
 351                      'description' => __( 'Human-readable labels for the taxonomy for various contexts.' ),
 352                      'type'        => 'object',
 353                      'context'     => array( 'edit' ),
 354                      'readonly'    => true,
 355                  ),
 356                  'name'           => array(
 357                      'description' => __( 'The title for the taxonomy.' ),
 358                      'type'        => 'string',
 359                      'context'     => array( 'view', 'edit', 'embed' ),
 360                      'readonly'    => true,
 361                  ),
 362                  'slug'           => array(
 363                      'description' => __( 'An alphanumeric identifier for the taxonomy.' ),
 364                      'type'        => 'string',
 365                      'context'     => array( 'view', 'edit', 'embed' ),
 366                      'readonly'    => true,
 367                  ),
 368                  'show_cloud'     => array(
 369                      'description' => __( 'Whether or not the term cloud should be displayed.' ),
 370                      'type'        => 'boolean',
 371                      'context'     => array( 'edit' ),
 372                      'readonly'    => true,
 373                  ),
 374                  'types'          => array(
 375                      'description' => __( 'Types associated with the taxonomy.' ),
 376                      'type'        => 'array',
 377                      'items'       => array(
 378                          'type' => 'string',
 379                      ),
 380                      'context'     => array( 'view', 'edit' ),
 381                      'readonly'    => true,
 382                  ),
 383                  'rest_base'      => array(
 384                      'description' => __( 'REST base route for the taxonomy.' ),
 385                      'type'        => 'string',
 386                      'context'     => array( 'view', 'edit', 'embed' ),
 387                      'readonly'    => true,
 388                  ),
 389                  'rest_namespace' => array(
 390                      'description' => __( 'REST namespace route for the taxonomy.' ),
 391                      'type'        => 'string',
 392                      'context'     => array( 'view', 'edit', 'embed' ),
 393                      'readonly'    => true,
 394                  ),
 395                  'visibility'     => array(
 396                      'description' => __( 'The visibility settings for the taxonomy.' ),
 397                      'type'        => 'object',
 398                      'context'     => array( 'edit' ),
 399                      'readonly'    => true,
 400                      'properties'  => array(
 401                          'public'             => array(
 402                              'description' => __( 'Whether a taxonomy is intended for use publicly either via the admin interface or by front-end users.' ),
 403                              'type'        => 'boolean',
 404                          ),
 405                          'publicly_queryable' => array(
 406                              'description' => __( 'Whether the taxonomy is publicly queryable.' ),
 407                              'type'        => 'boolean',
 408                          ),
 409                          'show_ui'            => array(
 410                              'description' => __( 'Whether to generate a default UI for managing this taxonomy.' ),
 411                              'type'        => 'boolean',
 412                          ),
 413                          'show_admin_column'  => array(
 414                              'description' => __( 'Whether to allow automatic creation of taxonomy columns on associated post-types table.' ),
 415                              'type'        => 'boolean',
 416                          ),
 417                          'show_in_nav_menus'  => array(
 418                              'description' => __( 'Whether to make the taxonomy available for selection in navigation menus.' ),
 419                              'type'        => 'boolean',
 420                          ),
 421                          'show_in_quick_edit' => array(
 422                              'description' => __( 'Whether to show the taxonomy in the quick/bulk edit panel.' ),
 423                              'type'        => 'boolean',
 424                          ),
 425  
 426                      ),
 427                  ),
 428              ),
 429          );
 430  
 431          $this->schema = $schema;
 432  
 433          return $this->add_additional_fields_schema( $this->schema );
 434      }
 435  
 436      /**
 437       * Retrieves the query params for collections.
 438       *
 439       * @since 4.7.0
 440       *
 441       * @return array Collection parameters.
 442       */
 443  	public function get_collection_params() {
 444          $new_params            = array();
 445          $new_params['context'] = $this->get_context_param( array( 'default' => 'view' ) );
 446          $new_params['type']    = array(
 447              'description' => __( 'Limit results to taxonomies associated with a specific post type.' ),
 448              'type'        => 'string',
 449          );
 450          return $new_params;
 451      }
 452  }