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1 <?php 2 /** 3 * REST API: WP_REST_Server class 4 * 5 * @package WordPress 6 * @subpackage REST_API 7 * @since 4.4.0 8 */ 9 10 /** 11 * Core class used to implement the WordPress REST API server. 12 * 13 * @since 4.4.0 14 */ 15 class WP_REST_Server { 16 17 /** 18 * Alias for GET transport method. 19 * 20 * @since 4.4.0 21 * @var string 22 */ 23 const READABLE = 'GET'; 24 25 /** 26 * Alias for POST transport method. 27 * 28 * @since 4.4.0 29 * @var string 30 */ 31 const CREATABLE = 'POST'; 32 33 /** 34 * Alias for POST, PUT, PATCH transport methods together. 35 * 36 * @since 4.4.0 37 * @var string 38 */ 39 const EDITABLE = 'POST, PUT, PATCH'; 40 41 /** 42 * Alias for DELETE transport method. 43 * 44 * @since 4.4.0 45 * @var string 46 */ 47 const DELETABLE = 'DELETE'; 48 49 /** 50 * Alias for GET, POST, PUT, PATCH & DELETE transport methods together. 51 * 52 * @since 4.4.0 53 * @var string 54 */ 55 const ALLMETHODS = 'GET, POST, PUT, PATCH, DELETE'; 56 57 /** 58 * Namespaces registered to the server. 59 * 60 * @since 4.4.0 61 * @var array 62 */ 63 protected $namespaces = array(); 64 65 /** 66 * Endpoints registered to the server. 67 * 68 * @since 4.4.0 69 * @var array 70 */ 71 protected $endpoints = array(); 72 73 /** 74 * Options defined for the routes. 75 * 76 * @since 4.4.0 77 * @var array 78 */ 79 protected $route_options = array(); 80 81 /** 82 * Caches embedded requests. 83 * 84 * @since 5.4.0 85 * @var array 86 */ 87 protected $embed_cache = array(); 88 89 /** 90 * Instantiates the REST server. 91 * 92 * @since 4.4.0 93 */ 94 public function __construct() { 95 $this->endpoints = array( 96 // Meta endpoints. 97 '/' => array( 98 'callback' => array( $this, 'get_index' ), 99 'methods' => 'GET', 100 'args' => array( 101 'context' => array( 102 'default' => 'view', 103 ), 104 ), 105 ), 106 ); 107 } 108 109 110 /** 111 * Checks the authentication headers if supplied. 112 * 113 * @since 4.4.0 114 * 115 * @return WP_Error|null WP_Error indicates unsuccessful login, null indicates successful 116 * or no authentication provided 117 */ 118 public function check_authentication() { 119 /** 120 * Filters REST authentication errors. 121 * 122 * This is used to pass a WP_Error from an authentication method back to 123 * the API. 124 * 125 * Authentication methods should check first if they're being used, as 126 * multiple authentication methods can be enabled on a site (cookies, 127 * HTTP basic auth, OAuth). If the authentication method hooked in is 128 * not actually being attempted, null should be returned to indicate 129 * another authentication method should check instead. Similarly, 130 * callbacks should ensure the value is `null` before checking for 131 * errors. 132 * 133 * A WP_Error instance can be returned if an error occurs, and this should 134 * match the format used by API methods internally (that is, the `status` 135 * data should be used). A callback can return `true` to indicate that 136 * the authentication method was used, and it succeeded. 137 * 138 * @since 4.4.0 139 * 140 * @param WP_Error|null|true $errors WP_Error if authentication error, null if authentication 141 * method wasn't used, true if authentication succeeded. 142 */ 143 return apply_filters( 'rest_authentication_errors', null ); 144 } 145 146 /** 147 * Converts an error to a response object. 148 * 149 * This iterates over all error codes and messages to change it into a flat 150 * array. This enables simpler client behaviour, as it is represented as a 151 * list in JSON rather than an object/map. 152 * 153 * @since 4.4.0 154 * 155 * @param WP_Error $error WP_Error instance. 156 * @return WP_REST_Response List of associative arrays with code and message keys. 157 */ 158 protected function error_to_response( $error ) { 159 $error_data = $error->get_error_data(); 160 161 if ( is_array( $error_data ) && isset( $error_data['status'] ) ) { 162 $status = $error_data['status']; 163 } else { 164 $status = 500; 165 } 166 167 $errors = array(); 168 169 foreach ( (array) $error->errors as $code => $messages ) { 170 foreach ( (array) $messages as $message ) { 171 $errors[] = array( 172 'code' => $code, 173 'message' => $message, 174 'data' => $error->get_error_data( $code ), 175 ); 176 } 177 } 178 179 $data = $errors[0]; 180 if ( count( $errors ) > 1 ) { 181 // Remove the primary error. 182 array_shift( $errors ); 183 $data['additional_errors'] = $errors; 184 } 185 186 $response = new WP_REST_Response( $data, $status ); 187 188 return $response; 189 } 190 191 /** 192 * Retrieves an appropriate error representation in JSON. 193 * 194 * Note: This should only be used in WP_REST_Server::serve_request(), as it 195 * cannot handle WP_Error internally. All callbacks and other internal methods 196 * should instead return a WP_Error with the data set to an array that includes 197 * a 'status' key, with the value being the HTTP status to send. 198 * 199 * @since 4.4.0 200 * 201 * @param string $code WP_Error-style code. 202 * @param string $message Human-readable message. 203 * @param int $status Optional. HTTP status code to send. Default null. 204 * @return string JSON representation of the error 205 */ 206 protected function json_error( $code, $message, $status = null ) { 207 if ( $status ) { 208 $this->set_status( $status ); 209 } 210 211 $error = compact( 'code', 'message' ); 212 213 return wp_json_encode( $error ); 214 } 215 216 /** 217 * Handles serving an API request. 218 * 219 * Matches the current server URI to a route and runs the first matching 220 * callback then outputs a JSON representation of the returned value. 221 * 222 * @since 4.4.0 223 * 224 * @see WP_REST_Server::dispatch() 225 * 226 * @param string $path Optional. The request route. If not set, `$_SERVER['PATH_INFO']` will be used. 227 * Default null. 228 * @return null|false Null if not served and a HEAD request, false otherwise. 229 */ 230 public function serve_request( $path = null ) { 231 $content_type = isset( $_GET['_jsonp'] ) ? 'application/javascript' : 'application/json'; 232 $this->send_header( 'Content-Type', $content_type . '; charset=' . get_option( 'blog_charset' ) ); 233 $this->send_header( 'X-Robots-Tag', 'noindex' ); 234 235 $api_root = get_rest_url(); 236 if ( ! empty( $api_root ) ) { 237 $this->send_header( 'Link', '<' . esc_url_raw( $api_root ) . '>; rel="https://api.w.org/"' ); 238 } 239 240 /* 241 * Mitigate possible JSONP Flash attacks. 242 * 243 * https://miki.it/blog/2014/7/8/abusing-jsonp-with-rosetta-flash/ 244 */ 245 $this->send_header( 'X-Content-Type-Options', 'nosniff' ); 246 $this->send_header( 'Access-Control-Expose-Headers', 'X-WP-Total, X-WP-TotalPages' ); 247 $this->send_header( 'Access-Control-Allow-Headers', 'Authorization, Content-Type' ); 248 249 /** 250 * Send nocache headers on authenticated requests. 251 * 252 * @since 4.4.0 253 * 254 * @param bool $rest_send_nocache_headers Whether to send no-cache headers. 255 */ 256 $send_no_cache_headers = apply_filters( 'rest_send_nocache_headers', is_user_logged_in() ); 257 if ( $send_no_cache_headers ) { 258 foreach ( wp_get_nocache_headers() as $header => $header_value ) { 259 if ( empty( $header_value ) ) { 260 $this->remove_header( $header ); 261 } else { 262 $this->send_header( $header, $header_value ); 263 } 264 } 265 } 266 267 /** 268 * Filters whether the REST API is enabled. 269 * 270 * @since 4.4.0 271 * @deprecated 4.7.0 Use the {@see 'rest_authentication_errors'} filter to 272 * restrict access to the API. 273 * 274 * @param bool $rest_enabled Whether the REST API is enabled. Default true. 275 */ 276 apply_filters_deprecated( 277 'rest_enabled', 278 array( true ), 279 '4.7.0', 280 'rest_authentication_errors', 281 sprintf( 282 /* translators: %s: rest_authentication_errors */ 283 __( 'The REST API can no longer be completely disabled, the %s filter can be used to restrict access to the API, instead.' ), 284 'rest_authentication_errors' 285 ) 286 ); 287 288 /** 289 * Filters whether jsonp is enabled. 290 * 291 * @since 4.4.0 292 * 293 * @param bool $jsonp_enabled Whether jsonp is enabled. Default true. 294 */ 295 $jsonp_enabled = apply_filters( 'rest_jsonp_enabled', true ); 296 297 $jsonp_callback = null; 298 299 if ( isset( $_GET['_jsonp'] ) ) { 300 if ( ! $jsonp_enabled ) { 301 echo $this->json_error( 'rest_callback_disabled', __( 'JSONP support is disabled on this site.' ), 400 ); 302 return false; 303 } 304 305 $jsonp_callback = $_GET['_jsonp']; 306 if ( ! wp_check_jsonp_callback( $jsonp_callback ) ) { 307 echo $this->json_error( 'rest_callback_invalid', __( 'Invalid JSONP callback function.' ), 400 ); 308 return false; 309 } 310 } 311 312 if ( empty( $path ) ) { 313 if ( isset( $_SERVER['PATH_INFO'] ) ) { 314 $path = $_SERVER['PATH_INFO']; 315 } else { 316 $path = '/'; 317 } 318 } 319 320 $request = new WP_REST_Request( $_SERVER['REQUEST_METHOD'], $path ); 321 322 $request->set_query_params( wp_unslash( $_GET ) ); 323 $request->set_body_params( wp_unslash( $_POST ) ); 324 $request->set_file_params( $_FILES ); 325 $request->set_headers( $this->get_headers( wp_unslash( $_SERVER ) ) ); 326 $request->set_body( self::get_raw_data() ); 327 328 /* 329 * HTTP method override for clients that can't use PUT/PATCH/DELETE. First, we check 330 * $_GET['_method']. If that is not set, we check for the HTTP_X_HTTP_METHOD_OVERRIDE 331 * header. 332 */ 333 if ( isset( $_GET['_method'] ) ) { 334 $request->set_method( $_GET['_method'] ); 335 } elseif ( isset( $_SERVER['HTTP_X_HTTP_METHOD_OVERRIDE'] ) ) { 336 $request->set_method( $_SERVER['HTTP_X_HTTP_METHOD_OVERRIDE'] ); 337 } 338 339 $result = $this->check_authentication(); 340 341 if ( ! is_wp_error( $result ) ) { 342 $result = $this->dispatch( $request ); 343 } 344 345 // Normalize to either WP_Error or WP_REST_Response... 346 $result = rest_ensure_response( $result ); 347 348 // ...then convert WP_Error across. 349 if ( is_wp_error( $result ) ) { 350 $result = $this->error_to_response( $result ); 351 } 352 353 /** 354 * Filters the API response. 355 * 356 * Allows modification of the response before returning. 357 * 358 * @since 4.4.0 359 * @since 4.5.0 Applied to embedded responses. 360 * 361 * @param WP_HTTP_Response $result Result to send to the client. Usually a WP_REST_Response. 362 * @param WP_REST_Server $this Server instance. 363 * @param WP_REST_Request $request Request used to generate the response. 364 */ 365 $result = apply_filters( 'rest_post_dispatch', rest_ensure_response( $result ), $this, $request ); 366 367 // Wrap the response in an envelope if asked for. 368 if ( isset( $_GET['_envelope'] ) ) { 369 $result = $this->envelope_response( $result, isset( $_GET['_embed'] ) ); 370 } 371 372 // Send extra data from response objects. 373 $headers = $result->get_headers(); 374 $this->send_headers( $headers ); 375 376 $code = $result->get_status(); 377 $this->set_status( $code ); 378 379 /** 380 * Filters whether the request has already been served. 381 * 382 * Allow sending the request manually - by returning true, the API result 383 * will not be sent to the client. 384 * 385 * @since 4.4.0 386 * 387 * @param bool $served Whether the request has already been served. 388 * Default false. 389 * @param WP_HTTP_Response $result Result to send to the client. Usually a WP_REST_Response. 390 * @param WP_REST_Request $request Request used to generate the response. 391 * @param WP_REST_Server $this Server instance. 392 */ 393 $served = apply_filters( 'rest_pre_serve_request', false, $result, $request, $this ); 394 395 if ( ! $served ) { 396 if ( 'HEAD' === $request->get_method() ) { 397 return null; 398 } 399 400 // Embed links inside the request. 401 $embed = isset( $_GET['_embed'] ) ? rest_parse_embed_param( $_GET['_embed'] ) : false; 402 $result = $this->response_to_data( $result, $embed ); 403 404 /** 405 * Filters the API response. 406 * 407 * Allows modification of the response data after inserting 408 * embedded data (if any) and before echoing the response data. 409 * 410 * @since 4.8.1 411 * 412 * @param array $result Response data to send to the client. 413 * @param WP_REST_Server $this Server instance. 414 * @param WP_REST_Request $request Request used to generate the response. 415 */ 416 $result = apply_filters( 'rest_pre_echo_response', $result, $this, $request ); 417 418 // The 204 response shouldn't have a body. 419 if ( 204 === $code || null === $result ) { 420 return null; 421 } 422 423 $result = wp_json_encode( $result ); 424 425 $json_error_message = $this->get_json_last_error(); 426 427 if ( $json_error_message ) { 428 $json_error_obj = new WP_Error( 429 'rest_encode_error', 430 $json_error_message, 431 array( 'status' => 500 ) 432 ); 433 434 $result = $this->error_to_response( $json_error_obj ); 435 $result = wp_json_encode( $result->data[0] ); 436 } 437 438 if ( $jsonp_callback ) { 439 // Prepend '/**/' to mitigate possible JSONP Flash attacks. 440 // https://miki.it/blog/2014/7/8/abusing-jsonp-with-rosetta-flash/ 441 echo '/**/' . $jsonp_callback . '(' . $result . ')'; 442 } else { 443 echo $result; 444 } 445 } 446 447 return null; 448 } 449 450 /** 451 * Converts a response to data to send. 452 * 453 * @since 4.4.0 454 * @since 5.4.0 The $embed parameter can now contain a list of link relations to include. 455 * 456 * @param WP_REST_Response $response Response object. 457 * @param bool|string[] $embed Whether to embed all links, a filtered list of link relations, or no links. 458 * @return array { 459 * Data with sub-requests embedded. 460 * 461 * @type array [$_links] Links. 462 * @type array [$_embedded] Embeddeds. 463 * } 464 */ 465 public function response_to_data( $response, $embed ) { 466 $data = $response->get_data(); 467 $links = self::get_compact_response_links( $response ); 468 469 if ( ! empty( $links ) ) { 470 // Convert links to part of the data. 471 $data['_links'] = $links; 472 } 473 474 if ( $embed ) { 475 $this->embed_cache = array(); 476 // Determine if this is a numeric array. 477 if ( wp_is_numeric_array( $data ) ) { 478 foreach ( $data as $key => $item ) { 479 $data[ $key ] = $this->embed_links( $item, $embed ); 480 } 481 } else { 482 $data = $this->embed_links( $data, $embed ); 483 } 484 $this->embed_cache = array(); 485 } 486 487 return $data; 488 } 489 490 /** 491 * Retrieves links from a response. 492 * 493 * Extracts the links from a response into a structured hash, suitable for 494 * direct output. 495 * 496 * @since 4.4.0 497 * 498 * @param WP_REST_Response $response Response to extract links from. 499 * @return array Map of link relation to list of link hashes. 500 */ 501 public static function get_response_links( $response ) { 502 $links = $response->get_links(); 503 504 if ( empty( $links ) ) { 505 return array(); 506 } 507 508 // Convert links to part of the data. 509 $data = array(); 510 foreach ( $links as $rel => $items ) { 511 $data[ $rel ] = array(); 512 513 foreach ( $items as $item ) { 514 $attributes = $item['attributes']; 515 $attributes['href'] = $item['href']; 516 $data[ $rel ][] = $attributes; 517 } 518 } 519 520 return $data; 521 } 522 523 /** 524 * Retrieves the CURIEs (compact URIs) used for relations. 525 * 526 * Extracts the links from a response into a structured hash, suitable for 527 * direct output. 528 * 529 * @since 4.5.0 530 * 531 * @param WP_REST_Response $response Response to extract links from. 532 * @return array Map of link relation to list of link hashes. 533 */ 534 public static function get_compact_response_links( $response ) { 535 $links = self::get_response_links( $response ); 536 537 if ( empty( $links ) ) { 538 return array(); 539 } 540 541 $curies = $response->get_curies(); 542 $used_curies = array(); 543 544 foreach ( $links as $rel => $items ) { 545 546 // Convert $rel URIs to their compact versions if they exist. 547 foreach ( $curies as $curie ) { 548 $href_prefix = substr( $curie['href'], 0, strpos( $curie['href'], '{rel}' ) ); 549 if ( strpos( $rel, $href_prefix ) !== 0 ) { 550 continue; 551 } 552 553 // Relation now changes from '$uri' to '$curie:$relation'. 554 $rel_regex = str_replace( '\{rel\}', '(.+)', preg_quote( $curie['href'], '!' ) ); 555 preg_match( '!' . $rel_regex . '!', $rel, $matches ); 556 if ( $matches ) { 557 $new_rel = $curie['name'] . ':' . $matches[1]; 558 $used_curies[ $curie['name'] ] = $curie; 559 $links[ $new_rel ] = $items; 560 unset( $links[ $rel ] ); 561 break; 562 } 563 } 564 } 565 566 // Push the curies onto the start of the links array. 567 if ( $used_curies ) { 568 $links['curies'] = array_values( $used_curies ); 569 } 570 571 return $links; 572 } 573 574 /** 575 * Embeds the links from the data into the request. 576 * 577 * @since 4.4.0 578 * @since 5.4.0 The $embed parameter can now contain a list of link relations to include. 579 * 580 * @param array $data Data from the request. 581 * @param bool|string[] $embed Whether to embed all links or a filtered list of link relations. 582 * @return array { 583 * Data with sub-requests embedded. 584 * 585 * @type array [$_links] Links. 586 * @type array [$_embedded] Embeddeds. 587 * } 588 */ 589 protected function embed_links( $data, $embed = true ) { 590 if ( empty( $data['_links'] ) ) { 591 return $data; 592 } 593 594 $embedded = array(); 595 596 foreach ( $data['_links'] as $rel => $links ) { 597 // If a list of relations was specified, and the link relation is not in the whitelist, don't process the link. 598 if ( is_array( $embed ) && ! in_array( $rel, $embed, true ) ) { 599 continue; 600 } 601 602 $embeds = array(); 603 604 foreach ( $links as $item ) { 605 // Determine if the link is embeddable. 606 if ( empty( $item['embeddable'] ) ) { 607 // Ensure we keep the same order. 608 $embeds[] = array(); 609 continue; 610 } 611 612 if ( ! array_key_exists( $item['href'], $this->embed_cache ) ) { 613 // Run through our internal routing and serve. 614 $request = WP_REST_Request::from_url( $item['href'] ); 615 if ( ! $request ) { 616 $embeds[] = array(); 617 continue; 618 } 619 620 // Embedded resources get passed context=embed. 621 if ( empty( $request['context'] ) ) { 622 $request['context'] = 'embed'; 623 } 624 625 $response = $this->dispatch( $request ); 626 627 /** This filter is documented in wp-includes/rest-api/class-wp-rest-server.php */ 628 $response = apply_filters( 'rest_post_dispatch', rest_ensure_response( $response ), $this, $request ); 629 630 $this->embed_cache[ $item['href'] ] = $this->response_to_data( $response, false ); 631 } 632 633 $embeds[] = $this->embed_cache[ $item['href'] ]; 634 } 635 636 // Determine if any real links were found. 637 $has_links = count( array_filter( $embeds ) ); 638 639 if ( $has_links ) { 640 $embedded[ $rel ] = $embeds; 641 } 642 } 643 644 if ( ! empty( $embedded ) ) { 645 $data['_embedded'] = $embedded; 646 } 647 648 return $data; 649 } 650 651 /** 652 * Wraps the response in an envelope. 653 * 654 * The enveloping technique is used to work around browser/client 655 * compatibility issues. Essentially, it converts the full HTTP response to 656 * data instead. 657 * 658 * @since 4.4.0 659 * 660 * @param WP_REST_Response $response Response object. 661 * @param bool $embed Whether links should be embedded. 662 * @return WP_REST_Response New response with wrapped data 663 */ 664 public function envelope_response( $response, $embed ) { 665 $envelope = array( 666 'body' => $this->response_to_data( $response, $embed ), 667 'status' => $response->get_status(), 668 'headers' => $response->get_headers(), 669 ); 670 671 /** 672 * Filters the enveloped form of a response. 673 * 674 * @since 4.4.0 675 * 676 * @param array $envelope Envelope data. 677 * @param WP_REST_Response $response Original response data. 678 */ 679 $envelope = apply_filters( 'rest_envelope_response', $envelope, $response ); 680 681 // Ensure it's still a response and return. 682 return rest_ensure_response( $envelope ); 683 } 684 685 /** 686 * Registers a route to the server. 687 * 688 * @since 4.4.0 689 * 690 * @param string $namespace Namespace. 691 * @param string $route The REST route. 692 * @param array $route_args Route arguments. 693 * @param bool $override Optional. Whether the route should be overridden if it already exists. 694 * Default false. 695 */ 696 public function register_route( $namespace, $route, $route_args, $override = false ) { 697 if ( ! isset( $this->namespaces[ $namespace ] ) ) { 698 $this->namespaces[ $namespace ] = array(); 699 700 $this->register_route( 701 $namespace, 702 '/' . $namespace, 703 array( 704 array( 705 'methods' => self::READABLE, 706 'callback' => array( $this, 'get_namespace_index' ), 707 'args' => array( 708 'namespace' => array( 709 'default' => $namespace, 710 ), 711 'context' => array( 712 'default' => 'view', 713 ), 714 ), 715 ), 716 ) 717 ); 718 } 719 720 // Associative to avoid double-registration. 721 $this->namespaces[ $namespace ][ $route ] = true; 722 $route_args['namespace'] = $namespace; 723 724 if ( $override || empty( $this->endpoints[ $route ] ) ) { 725 $this->endpoints[ $route ] = $route_args; 726 } else { 727 $this->endpoints[ $route ] = array_merge( $this->endpoints[ $route ], $route_args ); 728 } 729 } 730 731 /** 732 * Retrieves the route map. 733 * 734 * The route map is an associative array with path regexes as the keys. The 735 * value is an indexed array with the callback function/method as the first 736 * item, and a bitmask of HTTP methods as the second item (see the class 737 * constants). 738 * 739 * Each route can be mapped to more than one callback by using an array of 740 * the indexed arrays. This allows mapping e.g. GET requests to one callback 741 * and POST requests to another. 742 * 743 * Note that the path regexes (array keys) must have @ escaped, as this is 744 * used as the delimiter with preg_match() 745 * 746 * @since 4.4.0 747 * @since 5.4.0 Add $namespace parameter. 748 * 749 * @param string $namespace Optionally, only return routes in the given namespace. 750 * @return array `'/path/regex' => array( $callback, $bitmask )` or 751 * `'/path/regex' => array( array( $callback, $bitmask ), ...)`. 752 */ 753 public function get_routes( $namespace = '' ) { 754 $endpoints = $this->endpoints; 755 756 if ( $namespace ) { 757 $endpoints = wp_list_filter( $endpoints, array( 'namespace' => $namespace ) ); 758 } 759 760 /** 761 * Filters the array of available endpoints. 762 * 763 * @since 4.4.0 764 * 765 * @param array $endpoints The available endpoints. An array of matching regex patterns, each mapped 766 * to an array of callbacks for the endpoint. These take the format 767 * `'/path/regex' => array( $callback, $bitmask )` or 768 * `'/path/regex' => array( array( $callback, $bitmask ). 769 */ 770 $endpoints = apply_filters( 'rest_endpoints', $endpoints ); 771 772 // Normalise the endpoints. 773 $defaults = array( 774 'methods' => '', 775 'accept_json' => false, 776 'accept_raw' => false, 777 'show_in_index' => true, 778 'args' => array(), 779 ); 780 781 foreach ( $endpoints as $route => &$handlers ) { 782 783 if ( isset( $handlers['callback'] ) ) { 784 // Single endpoint, add one deeper. 785 $handlers = array( $handlers ); 786 } 787 788 if ( ! isset( $this->route_options[ $route ] ) ) { 789 $this->route_options[ $route ] = array(); 790 } 791 792 foreach ( $handlers as $key => &$handler ) { 793 794 if ( ! is_numeric( $key ) ) { 795 // Route option, move it to the options. 796 $this->route_options[ $route ][ $key ] = $handler; 797 unset( $handlers[ $key ] ); 798 continue; 799 } 800 801 $handler = wp_parse_args( $handler, $defaults ); 802 803 // Allow comma-separated HTTP methods. 804 if ( is_string( $handler['methods'] ) ) { 805 $methods = explode( ',', $handler['methods'] ); 806 } elseif ( is_array( $handler['methods'] ) ) { 807 $methods = $handler['methods']; 808 } else { 809 $methods = array(); 810 } 811 812 $handler['methods'] = array(); 813 814 foreach ( $methods as $method ) { 815 $method = strtoupper( trim( $method ) ); 816 $handler['methods'][ $method ] = true; 817 } 818 } 819 } 820 821 return $endpoints; 822 } 823 824 /** 825 * Retrieves namespaces registered on the server. 826 * 827 * @since 4.4.0 828 * 829 * @return string[] List of registered namespaces. 830 */ 831 public function get_namespaces() { 832 return array_keys( $this->namespaces ); 833 } 834 835 /** 836 * Retrieves specified options for a route. 837 * 838 * @since 4.4.0 839 * 840 * @param string $route Route pattern to fetch options for. 841 * @return array|null Data as an associative array if found, or null if not found. 842 */ 843 public function get_route_options( $route ) { 844 if ( ! isset( $this->route_options[ $route ] ) ) { 845 return null; 846 } 847 848 return $this->route_options[ $route ]; 849 } 850 851 /** 852 * Matches the request to a callback and call it. 853 * 854 * @since 4.4.0 855 * 856 * @param WP_REST_Request $request Request to attempt dispatching. 857 * @return WP_REST_Response Response returned by the callback. 858 */ 859 public function dispatch( $request ) { 860 /** 861 * Filters the pre-calculated result of a REST dispatch request. 862 * 863 * Allow hijacking the request before dispatching by returning a non-empty. The returned value 864 * will be used to serve the request instead. 865 * 866 * @since 4.4.0 867 * 868 * @param mixed $result Response to replace the requested version with. Can be anything 869 * a normal endpoint can return, or null to not hijack the request. 870 * @param WP_REST_Server $this Server instance. 871 * @param WP_REST_Request $request Request used to generate the response. 872 */ 873 $result = apply_filters( 'rest_pre_dispatch', null, $this, $request ); 874 875 if ( ! empty( $result ) ) { 876 return $result; 877 } 878 879 $method = $request->get_method(); 880 $path = $request->get_route(); 881 882 $with_namespace = array(); 883 884 foreach ( $this->get_namespaces() as $namespace ) { 885 if ( 0 === strpos( trailingslashit( ltrim( $path, '/' ) ), $namespace ) ) { 886 $with_namespace[] = $this->get_routes( $namespace ); 887 } 888 } 889 890 if ( $with_namespace ) { 891 $routes = array_merge( ...$with_namespace ); 892 } else { 893 $routes = $this->get_routes(); 894 } 895 896 foreach ( $routes as $route => $handlers ) { 897 $match = preg_match( '@^' . $route . '$@i', $path, $matches ); 898 899 if ( ! $match ) { 900 continue; 901 } 902 903 $args = array(); 904 905 foreach ( $matches as $param => $value ) { 906 if ( ! is_int( $param ) ) { 907 $args[ $param ] = $value; 908 } 909 } 910 911 foreach ( $handlers as $handler ) { 912 $callback = $handler['callback']; 913 $response = null; 914 915 // Fallback to GET method if no HEAD method is registered. 916 $checked_method = $method; 917 if ( 'HEAD' === $method && empty( $handler['methods']['HEAD'] ) ) { 918 $checked_method = 'GET'; 919 } 920 if ( empty( $handler['methods'][ $checked_method ] ) ) { 921 continue; 922 } 923 924 if ( ! is_callable( $callback ) ) { 925 $response = new WP_Error( 926 'rest_invalid_handler', 927 __( 'The handler for the route is invalid' ), 928 array( 'status' => 500 ) 929 ); 930 } 931 932 if ( ! is_wp_error( $response ) ) { 933 // Remove the redundant preg_match argument. 934 unset( $args[0] ); 935 936 $request->set_url_params( $args ); 937 $request->set_attributes( $handler ); 938 939 $defaults = array(); 940 941 foreach ( $handler['args'] as $arg => $options ) { 942 if ( isset( $options['default'] ) ) { 943 $defaults[ $arg ] = $options['default']; 944 } 945 } 946 947 $request->set_default_params( $defaults ); 948 949 $check_required = $request->has_valid_params(); 950 if ( is_wp_error( $check_required ) ) { 951 $response = $check_required; 952 } else { 953 $check_sanitized = $request->sanitize_params(); 954 if ( is_wp_error( $check_sanitized ) ) { 955 $response = $check_sanitized; 956 } 957 } 958 } 959 960 /** 961 * Filters the response before executing any REST API callbacks. 962 * 963 * Allows plugins to perform additional validation after a 964 * request is initialized and matched to a registered route, 965 * but before it is executed. 966 * 967 * Note that this filter will not be called for requests that 968 * fail to authenticate or match to a registered route. 969 * 970 * @since 4.7.0 971 * 972 * @param WP_HTTP_Response|WP_Error $response Result to send to the client. Usually a WP_REST_Response or WP_Error. 973 * @param array $handler Route handler used for the request. 974 * @param WP_REST_Request $request Request used to generate the response. 975 */ 976 $response = apply_filters( 'rest_request_before_callbacks', $response, $handler, $request ); 977 978 if ( ! is_wp_error( $response ) ) { 979 // Check permission specified on the route. 980 if ( ! empty( $handler['permission_callback'] ) ) { 981 $permission = call_user_func( $handler['permission_callback'], $request ); 982 983 if ( is_wp_error( $permission ) ) { 984 $response = $permission; 985 } elseif ( false === $permission || null === $permission ) { 986 $response = new WP_Error( 987 'rest_forbidden', 988 __( 'Sorry, you are not allowed to do that.' ), 989 array( 'status' => rest_authorization_required_code() ) 990 ); 991 } 992 } 993 } 994 995 if ( ! is_wp_error( $response ) ) { 996 /** 997 * Filters the REST dispatch request result. 998 * 999 * Allow plugins to override dispatching the request. 1000 * 1001 * @since 4.4.0 1002 * @since 4.5.0 Added `$route` and `$handler` parameters. 1003 * 1004 * @param mixed $dispatch_result Dispatch result, will be used if not empty. 1005 * @param WP_REST_Request $request Request used to generate the response. 1006 * @param string $route Route matched for the request. 1007 * @param array $handler Route handler used for the request. 1008 */ 1009 $dispatch_result = apply_filters( 'rest_dispatch_request', null, $request, $route, $handler ); 1010 1011 // Allow plugins to halt the request via this filter. 1012 if ( null !== $dispatch_result ) { 1013 $response = $dispatch_result; 1014 } else { 1015 $response = call_user_func( $callback, $request ); 1016 } 1017 } 1018 1019 /** 1020 * Filters the response immediately after executing any REST API 1021 * callbacks. 1022 * 1023 * Allows plugins to perform any needed cleanup, for example, 1024 * to undo changes made during the {@see 'rest_request_before_callbacks'} 1025 * filter. 1026 * 1027 * Note that this filter will not be called for requests that 1028 * fail to authenticate or match to a registered route. 1029 * 1030 * Note that an endpoint's `permission_callback` can still be 1031 * called after this filter - see `rest_send_allow_header()`. 1032 * 1033 * @since 4.7.0 1034 * 1035 * @param WP_HTTP_Response|WP_Error $response Result to send to the client. Usually a WP_REST_Response or WP_Error. 1036 * @param array $handler Route handler used for the request. 1037 * @param WP_REST_Request $request Request used to generate the response. 1038 */ 1039 $response = apply_filters( 'rest_request_after_callbacks', $response, $handler, $request ); 1040 1041 if ( is_wp_error( $response ) ) { 1042 $response = $this->error_to_response( $response ); 1043 } else { 1044 $response = rest_ensure_response( $response ); 1045 } 1046 1047 $response->set_matched_route( $route ); 1048 $response->set_matched_handler( $handler ); 1049 1050 return $response; 1051 } 1052 } 1053 1054 return $this->error_to_response( 1055 new WP_Error( 1056 'rest_no_route', 1057 __( 'No route was found matching the URL and request method' ), 1058 array( 'status' => 404 ) 1059 ) 1060 ); 1061 } 1062 1063 /** 1064 * Returns if an error occurred during most recent JSON encode/decode. 1065 * 1066 * Strings to be translated will be in format like 1067 * "Encoding error: Maximum stack depth exceeded". 1068 * 1069 * @since 4.4.0 1070 * 1071 * @return bool|string Boolean false or string error message. 1072 */ 1073 protected function get_json_last_error() { 1074 $last_error_code = json_last_error(); 1075 1076 if ( JSON_ERROR_NONE === $last_error_code || empty( $last_error_code ) ) { 1077 return false; 1078 } 1079 1080 return json_last_error_msg(); 1081 } 1082 1083 /** 1084 * Retrieves the site index. 1085 * 1086 * This endpoint describes the capabilities of the site. 1087 * 1088 * @since 4.4.0 1089 * 1090 * @param array $request { 1091 * Request. 1092 * 1093 * @type string $context Context. 1094 * } 1095 * @return WP_REST_Response The API root index data. 1096 */ 1097 public function get_index( $request ) { 1098 // General site data. 1099 $available = array( 1100 'name' => get_option( 'blogname' ), 1101 'description' => get_option( 'blogdescription' ), 1102 'url' => get_option( 'siteurl' ), 1103 'home' => home_url(), 1104 'gmt_offset' => get_option( 'gmt_offset' ), 1105 'timezone_string' => get_option( 'timezone_string' ), 1106 'namespaces' => array_keys( $this->namespaces ), 1107 'authentication' => array(), 1108 'routes' => $this->get_data_for_routes( $this->get_routes(), $request['context'] ), 1109 ); 1110 1111 $response = new WP_REST_Response( $available ); 1112 1113 $response->add_link( 'help', 'http://v2.wp-api.org/' ); 1114 1115 /** 1116 * Filters the API root index data. 1117 * 1118 * This contains the data describing the API. This includes information 1119 * about supported authentication schemes, supported namespaces, routes 1120 * available on the API, and a small amount of data about the site. 1121 * 1122 * @since 4.4.0 1123 * 1124 * @param WP_REST_Response $response Response data. 1125 */ 1126 return apply_filters( 'rest_index', $response ); 1127 } 1128 1129 /** 1130 * Retrieves the index for a namespace. 1131 * 1132 * @since 4.4.0 1133 * 1134 * @param WP_REST_Request $request REST request instance. 1135 * @return WP_REST_Response|WP_Error WP_REST_Response instance if the index was found, 1136 * WP_Error if the namespace isn't set. 1137 */ 1138 public function get_namespace_index( $request ) { 1139 $namespace = $request['namespace']; 1140 1141 if ( ! isset( $this->namespaces[ $namespace ] ) ) { 1142 return new WP_Error( 1143 'rest_invalid_namespace', 1144 __( 'The specified namespace could not be found.' ), 1145 array( 'status' => 404 ) 1146 ); 1147 } 1148 1149 $routes = $this->namespaces[ $namespace ]; 1150 $endpoints = array_intersect_key( $this->get_routes(), $routes ); 1151 1152 $data = array( 1153 'namespace' => $namespace, 1154 'routes' => $this->get_data_for_routes( $endpoints, $request['context'] ), 1155 ); 1156 $response = rest_ensure_response( $data ); 1157 1158 // Link to the root index. 1159 $response->add_link( 'up', rest_url( '/' ) ); 1160 1161 /** 1162 * Filters the namespace index data. 1163 * 1164 * This typically is just the route data for the namespace, but you can 1165 * add any data you'd like here. 1166 * 1167 * @since 4.4.0 1168 * 1169 * @param WP_REST_Response $response Response data. 1170 * @param WP_REST_Request $request Request data. The namespace is passed as the 'namespace' parameter. 1171 */ 1172 return apply_filters( 'rest_namespace_index', $response, $request ); 1173 } 1174 1175 /** 1176 * Retrieves the publicly-visible data for routes. 1177 * 1178 * @since 4.4.0 1179 * 1180 * @param array $routes Routes to get data for. 1181 * @param string $context Optional. Context for data. Accepts 'view' or 'help'. Default 'view'. 1182 * @return array[] Route data to expose in indexes, keyed by route. 1183 */ 1184 public function get_data_for_routes( $routes, $context = 'view' ) { 1185 $available = array(); 1186 1187 // Find the available routes. 1188 foreach ( $routes as $route => $callbacks ) { 1189 $data = $this->get_data_for_route( $route, $callbacks, $context ); 1190 if ( empty( $data ) ) { 1191 continue; 1192 } 1193 1194 /** 1195 * Filters the REST endpoint data. 1196 * 1197 * @since 4.4.0 1198 * 1199 * @param WP_REST_Request $request Request data. The namespace is passed as the 'namespace' parameter. 1200 */ 1201 $available[ $route ] = apply_filters( 'rest_endpoints_description', $data ); 1202 } 1203 1204 /** 1205 * Filters the publicly-visible data for routes. 1206 * 1207 * This data is exposed on indexes and can be used by clients or 1208 * developers to investigate the site and find out how to use it. It 1209 * acts as a form of self-documentation. 1210 * 1211 * @since 4.4.0 1212 * 1213 * @param array[] $available Route data to expose in indexes, keyed by route. 1214 * @param array $routes Internal route data as an associative array. 1215 */ 1216 return apply_filters( 'rest_route_data', $available, $routes ); 1217 } 1218 1219 /** 1220 * Retrieves publicly-visible data for the route. 1221 * 1222 * @since 4.4.0 1223 * 1224 * @param string $route Route to get data for. 1225 * @param array $callbacks Callbacks to convert to data. 1226 * @param string $context Optional. Context for the data. Accepts 'view' or 'help'. Default 'view'. 1227 * @return array|null Data for the route, or null if no publicly-visible data. 1228 */ 1229 public function get_data_for_route( $route, $callbacks, $context = 'view' ) { 1230 $data = array( 1231 'namespace' => '', 1232 'methods' => array(), 1233 'endpoints' => array(), 1234 ); 1235 1236 if ( isset( $this->route_options[ $route ] ) ) { 1237 $options = $this->route_options[ $route ]; 1238 1239 if ( isset( $options['namespace'] ) ) { 1240 $data['namespace'] = $options['namespace']; 1241 } 1242 1243 if ( isset( $options['schema'] ) && 'help' === $context ) { 1244 $data['schema'] = call_user_func( $options['schema'] ); 1245 } 1246 } 1247 1248 $route = preg_replace( '#\(\?P<(\w+?)>.*?\)#', '{$1}', $route ); 1249 1250 foreach ( $callbacks as $callback ) { 1251 // Skip to the next route if any callback is hidden. 1252 if ( empty( $callback['show_in_index'] ) ) { 1253 continue; 1254 } 1255 1256 $data['methods'] = array_merge( $data['methods'], array_keys( $callback['methods'] ) ); 1257 $endpoint_data = array( 1258 'methods' => array_keys( $callback['methods'] ), 1259 ); 1260 1261 if ( isset( $callback['args'] ) ) { 1262 $endpoint_data['args'] = array(); 1263 1264 foreach ( $callback['args'] as $key => $opts ) { 1265 $arg_data = array( 1266 'required' => ! empty( $opts['required'] ), 1267 ); 1268 if ( isset( $opts['default'] ) ) { 1269 $arg_data['default'] = $opts['default']; 1270 } 1271 if ( isset( $opts['enum'] ) ) { 1272 $arg_data['enum'] = $opts['enum']; 1273 } 1274 if ( isset( $opts['description'] ) ) { 1275 $arg_data['description'] = $opts['description']; 1276 } 1277 if ( isset( $opts['type'] ) ) { 1278 $arg_data['type'] = $opts['type']; 1279 } 1280 if ( isset( $opts['items'] ) ) { 1281 $arg_data['items'] = $opts['items']; 1282 } 1283 $endpoint_data['args'][ $key ] = $arg_data; 1284 } 1285 } 1286 1287 $data['endpoints'][] = $endpoint_data; 1288 1289 // For non-variable routes, generate links. 1290 if ( strpos( $route, '{' ) === false ) { 1291 $data['_links'] = array( 1292 'self' => array( 1293 array( 1294 'href' => rest_url( $route ), 1295 ), 1296 ), 1297 ); 1298 } 1299 } 1300 1301 if ( empty( $data['methods'] ) ) { 1302 // No methods supported, hide the route. 1303 return null; 1304 } 1305 1306 return $data; 1307 } 1308 1309 /** 1310 * Sends an HTTP status code. 1311 * 1312 * @since 4.4.0 1313 * 1314 * @param int $code HTTP status. 1315 */ 1316 protected function set_status( $code ) { 1317 status_header( $code ); 1318 } 1319 1320 /** 1321 * Sends an HTTP header. 1322 * 1323 * @since 4.4.0 1324 * 1325 * @param string $key Header key. 1326 * @param string $value Header value. 1327 */ 1328 public function send_header( $key, $value ) { 1329 /* 1330 * Sanitize as per RFC2616 (Section 4.2): 1331 * 1332 * Any LWS that occurs between field-content MAY be replaced with a 1333 * single SP before interpreting the field value or forwarding the 1334 * message downstream. 1335 */ 1336 $value = preg_replace( '/\s+/', ' ', $value ); 1337 header( sprintf( '%s: %s', $key, $value ) ); 1338 } 1339 1340 /** 1341 * Sends multiple HTTP headers. 1342 * 1343 * @since 4.4.0 1344 * 1345 * @param array $headers Map of header name to header value. 1346 */ 1347 public function send_headers( $headers ) { 1348 foreach ( $headers as $key => $value ) { 1349 $this->send_header( $key, $value ); 1350 } 1351 } 1352 1353 /** 1354 * Removes an HTTP header from the current response. 1355 * 1356 * @since 4.8.0 1357 * 1358 * @param string $key Header key. 1359 */ 1360 public function remove_header( $key ) { 1361 header_remove( $key ); 1362 } 1363 1364 /** 1365 * Retrieves the raw request entity (body). 1366 * 1367 * @since 4.4.0 1368 * 1369 * @global string $HTTP_RAW_POST_DATA Raw post data. 1370 * 1371 * @return string Raw request data. 1372 */ 1373 public static function get_raw_data() { 1374 global $HTTP_RAW_POST_DATA; 1375 1376 /* 1377 * A bug in PHP < 5.2.2 makes $HTTP_RAW_POST_DATA not set by default, 1378 * but we can do it ourself. 1379 */ 1380 if ( ! isset( $HTTP_RAW_POST_DATA ) ) { 1381 $HTTP_RAW_POST_DATA = file_get_contents( 'php://input' ); 1382 } 1383 1384 return $HTTP_RAW_POST_DATA; 1385 } 1386 1387 /** 1388 * Extracts headers from a PHP-style $_SERVER array. 1389 * 1390 * @since 4.4.0 1391 * 1392 * @param array $server Associative array similar to `$_SERVER`. 1393 * @return array Headers extracted from the input. 1394 */ 1395 public function get_headers( $server ) { 1396 $headers = array(); 1397 1398 // CONTENT_* headers are not prefixed with HTTP_. 1399 $additional = array( 1400 'CONTENT_LENGTH' => true, 1401 'CONTENT_MD5' => true, 1402 'CONTENT_TYPE' => true, 1403 ); 1404 1405 foreach ( $server as $key => $value ) { 1406 if ( strpos( $key, 'HTTP_' ) === 0 ) { 1407 $headers[ substr( $key, 5 ) ] = $value; 1408 } elseif ( 'REDIRECT_HTTP_AUTHORIZATION' === $key && empty( $server['HTTP_AUTHORIZATION'] ) ) { 1409 /* 1410 * In some server configurations, the authorization header is passed in this alternate location. 1411 * Since it would not be passed in in both places we do not check for both headers and resolve. 1412 */ 1413 $headers['AUTHORIZATION'] = $value; 1414 } elseif ( isset( $additional[ $key ] ) ) { 1415 $headers[ $key ] = $value; 1416 } 1417 } 1418 1419 return $headers; 1420 } 1421 }
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| Generated: Thu Feb 27 01:00:03 2020 | Cross-referenced by PHPXref 0.7.1 |