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/wp-includes/ -> class-http.php (source)

   1  <?php
   2  /**
   3   * HTTP API: WP_Http class
   4   *
   5   * @package WordPress
   6   * @subpackage HTTP
   7   * @since 2.7.0
   8   */
   9  
  10  if ( ! class_exists( 'Requests' ) ) {
  11      require  ABSPATH . WPINC . '/class-requests.php';
  12  
  13      Requests::register_autoloader();
  14      Requests::set_certificate_path( ABSPATH . WPINC . '/certificates/ca-bundle.crt' );
  15  }
  16  
  17  /**
  18   * Core class used for managing HTTP transports and making HTTP requests.
  19   *
  20   * This class is used to consistently make outgoing HTTP requests easy for developers
  21   * while still being compatible with the many PHP configurations under which
  22   * WordPress runs.
  23   *
  24   * Debugging includes several actions, which pass different variables for debugging the HTTP API.
  25   *
  26   * @since 2.7.0
  27   */
  28  class WP_Http {
  29  
  30      // Aliases for HTTP response codes.
  31      const HTTP_CONTINUE       = 100;
  32      const SWITCHING_PROTOCOLS = 101;
  33      const PROCESSING          = 102;
  34      const EARLY_HINTS         = 103;
  35  
  36      const OK                            = 200;
  37      const CREATED                       = 201;
  38      const ACCEPTED                      = 202;
  39      const NON_AUTHORITATIVE_INFORMATION = 203;
  40      const NO_CONTENT                    = 204;
  41      const RESET_CONTENT                 = 205;
  42      const PARTIAL_CONTENT               = 206;
  43      const MULTI_STATUS                  = 207;
  44      const IM_USED                       = 226;
  45  
  46      const MULTIPLE_CHOICES   = 300;
  47      const MOVED_PERMANENTLY  = 301;
  48      const FOUND              = 302;
  49      const SEE_OTHER          = 303;
  50      const NOT_MODIFIED       = 304;
  51      const USE_PROXY          = 305;
  52      const RESERVED           = 306;
  53      const TEMPORARY_REDIRECT = 307;
  54      const PERMANENT_REDIRECT = 308;
  55  
  56      const BAD_REQUEST                     = 400;
  57      const UNAUTHORIZED                    = 401;
  58      const PAYMENT_REQUIRED                = 402;
  59      const FORBIDDEN                       = 403;
  60      const NOT_FOUND                       = 404;
  61      const METHOD_NOT_ALLOWED              = 405;
  62      const NOT_ACCEPTABLE                  = 406;
  63      const PROXY_AUTHENTICATION_REQUIRED   = 407;
  64      const REQUEST_TIMEOUT                 = 408;
  65      const CONFLICT                        = 409;
  66      const GONE                            = 410;
  67      const LENGTH_REQUIRED                 = 411;
  68      const PRECONDITION_FAILED             = 412;
  69      const REQUEST_ENTITY_TOO_LARGE        = 413;
  70      const REQUEST_URI_TOO_LONG            = 414;
  71      const UNSUPPORTED_MEDIA_TYPE          = 415;
  72      const REQUESTED_RANGE_NOT_SATISFIABLE = 416;
  73      const EXPECTATION_FAILED              = 417;
  74      const IM_A_TEAPOT                     = 418;
  75      const MISDIRECTED_REQUEST             = 421;
  76      const UNPROCESSABLE_ENTITY            = 422;
  77      const LOCKED                          = 423;
  78      const FAILED_DEPENDENCY               = 424;
  79      const UPGRADE_REQUIRED                = 426;
  80      const PRECONDITION_REQUIRED           = 428;
  81      const TOO_MANY_REQUESTS               = 429;
  82      const REQUEST_HEADER_FIELDS_TOO_LARGE = 431;
  83      const UNAVAILABLE_FOR_LEGAL_REASONS   = 451;
  84  
  85      const INTERNAL_SERVER_ERROR           = 500;
  86      const NOT_IMPLEMENTED                 = 501;
  87      const BAD_GATEWAY                     = 502;
  88      const SERVICE_UNAVAILABLE             = 503;
  89      const GATEWAY_TIMEOUT                 = 504;
  90      const HTTP_VERSION_NOT_SUPPORTED      = 505;
  91      const VARIANT_ALSO_NEGOTIATES         = 506;
  92      const INSUFFICIENT_STORAGE            = 507;
  93      const NOT_EXTENDED                    = 510;
  94      const NETWORK_AUTHENTICATION_REQUIRED = 511;
  95  
  96      /**
  97       * Send an HTTP request to a URI.
  98       *
  99       * Please note: The only URI that are supported in the HTTP Transport implementation
 100       * are the HTTP and HTTPS protocols.
 101       *
 102       * @since 2.7.0
 103       *
 104       * @param string       $url  The request URL.
 105       * @param string|array $args {
 106       *     Optional. Array or string of HTTP request arguments.
 107       *
 108       *     @type string       $method              Request method. Accepts 'GET', 'POST', 'HEAD', 'PUT', 'DELETE',
 109       *                                             'TRACE', 'OPTIONS', or 'PATCH'.
 110       *                                             Some transports technically allow others, but should not be
 111       *                                             assumed. Default 'GET'.
 112       *     @type float        $timeout             How long the connection should stay open in seconds. Default 5.
 113       *     @type int          $redirection         Number of allowed redirects. Not supported by all transports.
 114       *                                             Default 5.
 115       *     @type string       $httpversion         Version of the HTTP protocol to use. Accepts '1.0' and '1.1'.
 116       *                                             Default '1.0'.
 117       *     @type string       $user-agent          User-agent value sent.
 118       *                                             Default 'WordPress/' . get_bloginfo( 'version' ) . '; ' . get_bloginfo( 'url' ).
 119       *     @type bool         $reject_unsafe_urls  Whether to pass URLs through wp_http_validate_url().
 120       *                                             Default false.
 121       *     @type bool         $blocking            Whether the calling code requires the result of the request.
 122       *                                             If set to false, the request will be sent to the remote server,
 123       *                                             and processing returned to the calling code immediately, the caller
 124       *                                             will know if the request succeeded or failed, but will not receive
 125       *                                             any response from the remote server. Default true.
 126       *     @type string|array $headers             Array or string of headers to send with the request.
 127       *                                             Default empty array.
 128       *     @type array        $cookies             List of cookies to send with the request. Default empty array.
 129       *     @type string|array $body                Body to send with the request. Default null.
 130       *     @type bool         $compress            Whether to compress the $body when sending the request.
 131       *                                             Default false.
 132       *     @type bool         $decompress          Whether to decompress a compressed response. If set to false and
 133       *                                             compressed content is returned in the response anyway, it will
 134       *                                             need to be separately decompressed. Default true.
 135       *     @type bool         $sslverify           Whether to verify SSL for the request. Default true.
 136       *     @type string       $sslcertificates     Absolute path to an SSL certificate .crt file.
 137       *                                             Default ABSPATH . WPINC . '/certificates/ca-bundle.crt'.
 138       *     @type bool         $stream              Whether to stream to a file. If set to true and no filename was
 139       *                                             given, it will be droped it in the WP temp dir and its name will
 140       *                                             be set using the basename of the URL. Default false.
 141       *     @type string       $filename            Filename of the file to write to when streaming. $stream must be
 142       *                                             set to true. Default null.
 143       *     @type int          $limit_response_size Size in bytes to limit the response to. Default null.
 144       *
 145       * }
 146       * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'.
 147       *                        A WP_Error instance upon error.
 148       */
 149  	public function request( $url, $args = array() ) {
 150          $defaults = array(
 151              'method'              => 'GET',
 152              /**
 153               * Filters the timeout value for an HTTP request.
 154               *
 155               * @since 2.7.0
 156               * @since 5.1.0 The `$url` parameter was added.
 157               *
 158               * @param float  $timeout_value Time in seconds until a request times out. Default 5.
 159               * @param string $url           The request URL.
 160               */
 161              'timeout'             => apply_filters( 'http_request_timeout', 5, $url ),
 162              /**
 163               * Filters the number of redirects allowed during an HTTP request.
 164               *
 165               * @since 2.7.0
 166               * @since 5.1.0 The `$url` parameter was added.
 167               *
 168               * @param int    $redirect_count Number of redirects allowed. Default 5.
 169               * @param string $url            The request URL.
 170               */
 171              'redirection'         => apply_filters( 'http_request_redirection_count', 5, $url ),
 172              /**
 173               * Filters the version of the HTTP protocol used in a request.
 174               *
 175               * @since 2.7.0
 176               * @since 5.1.0 The `$url` parameter was added.
 177               *
 178               * @param string $version Version of HTTP used. Accepts '1.0' and '1.1'. Default '1.0'.
 179               * @param string $url     The request URL.
 180               */
 181              'httpversion'         => apply_filters( 'http_request_version', '1.0', $url ),
 182              /**
 183               * Filters the user agent value sent with an HTTP request.
 184               *
 185               * @since 2.7.0
 186               * @since 5.1.0 The `$url` parameter was added.
 187               *
 188               * @param string $user_agent WordPress user agent string.
 189               * @param string $url        The request URL.
 190               */
 191              'user-agent'          => apply_filters( 'http_headers_useragent', 'WordPress/' . get_bloginfo( 'version' ) . '; ' . get_bloginfo( 'url' ), $url ),
 192              /**
 193               * Filters whether to pass URLs through wp_http_validate_url() in an HTTP request.
 194               *
 195               * @since 3.6.0
 196               * @since 5.1.0 The `$url` parameter was added.
 197               *
 198               * @param bool   $pass_url Whether to pass URLs through wp_http_validate_url(). Default false.
 199               * @param string $url      The request URL.
 200               */
 201              'reject_unsafe_urls'  => apply_filters( 'http_request_reject_unsafe_urls', false, $url ),
 202              'blocking'            => true,
 203              'headers'             => array(),
 204              'cookies'             => array(),
 205              'body'                => null,
 206              'compress'            => false,
 207              'decompress'          => true,
 208              'sslverify'           => true,
 209              'sslcertificates'     => ABSPATH . WPINC . '/certificates/ca-bundle.crt',
 210              'stream'              => false,
 211              'filename'            => null,
 212              'limit_response_size' => null,
 213          );
 214  
 215          // Pre-parse for the HEAD checks.
 216          $args = wp_parse_args( $args );
 217  
 218          // By default, HEAD requests do not cause redirections.
 219          if ( isset( $args['method'] ) && 'HEAD' === $args['method'] ) {
 220              $defaults['redirection'] = 0;
 221          }
 222  
 223          $parsed_args = wp_parse_args( $args, $defaults );
 224          /**
 225           * Filters the arguments used in an HTTP request.
 226           *
 227           * @since 2.7.0
 228           *
 229           * @param array  $parsed_args An array of HTTP request arguments.
 230           * @param string $url         The request URL.
 231           */
 232          $parsed_args = apply_filters( 'http_request_args', $parsed_args, $url );
 233  
 234          // The transports decrement this, store a copy of the original value for loop purposes.
 235          if ( ! isset( $parsed_args['_redirection'] ) ) {
 236              $parsed_args['_redirection'] = $parsed_args['redirection'];
 237          }
 238  
 239          /**
 240           * Filters the preemptive return value of an HTTP request.
 241           *
 242           * Returning a non-false value from the filter will short-circuit the HTTP request and return
 243           * early with that value. A filter should return one of:
 244           *
 245           *  - An array containing 'headers', 'body', 'response', 'cookies', and 'filename' elements
 246           *  - A WP_Error instance
 247           *  - boolean false to avoid short-circuiting the response
 248           *
 249           * Returning any other value may result in unexpected behaviour.
 250           *
 251           * @since 2.9.0
 252           *
 253           * @param false|array|WP_Error $preempt     A preemptive return value of an HTTP request. Default false.
 254           * @param array                $parsed_args HTTP request arguments.
 255           * @param string               $url         The request URL.
 256           */
 257          $pre = apply_filters( 'pre_http_request', false, $parsed_args, $url );
 258  
 259          if ( false !== $pre ) {
 260              return $pre;
 261          }
 262  
 263          if ( function_exists( 'wp_kses_bad_protocol' ) ) {
 264              if ( $parsed_args['reject_unsafe_urls'] ) {
 265                  $url = wp_http_validate_url( $url );
 266              }
 267              if ( $url ) {
 268                  $url = wp_kses_bad_protocol( $url, array( 'http', 'https', 'ssl' ) );
 269              }
 270          }
 271  
 272          $arrURL = parse_url( $url );
 273  
 274          if ( empty( $url ) || empty( $arrURL['scheme'] ) ) {
 275              $response = new WP_Error( 'http_request_failed', __( 'A valid URL was not provided.' ) );
 276              /** This action is documented in wp-includes/class-http.php */
 277              do_action( 'http_api_debug', $response, 'response', 'Requests', $parsed_args, $url );
 278              return $response;
 279          }
 280  
 281          if ( $this->block_request( $url ) ) {
 282              $response = new WP_Error( 'http_request_not_executed', __( 'User has blocked requests through HTTP.' ) );
 283              /** This action is documented in wp-includes/class-http.php */
 284              do_action( 'http_api_debug', $response, 'response', 'Requests', $parsed_args, $url );
 285              return $response;
 286          }
 287  
 288          // If we are streaming to a file but no filename was given drop it in the WP temp dir
 289          // and pick its name using the basename of the $url.
 290          if ( $parsed_args['stream'] ) {
 291              if ( empty( $parsed_args['filename'] ) ) {
 292                  $parsed_args['filename'] = get_temp_dir() . basename( $url );
 293              }
 294  
 295              // Force some settings if we are streaming to a file and check for existence
 296              // and perms of destination directory.
 297              $parsed_args['blocking'] = true;
 298              if ( ! wp_is_writable( dirname( $parsed_args['filename'] ) ) ) {
 299                  $response = new WP_Error( 'http_request_failed', __( 'Destination directory for file streaming does not exist or is not writable.' ) );
 300                  /** This action is documented in wp-includes/class-http.php */
 301                  do_action( 'http_api_debug', $response, 'response', 'Requests', $parsed_args, $url );
 302                  return $response;
 303              }
 304          }
 305  
 306          if ( is_null( $parsed_args['headers'] ) ) {
 307              $parsed_args['headers'] = array();
 308          }
 309  
 310          // WP allows passing in headers as a string, weirdly.
 311          if ( ! is_array( $parsed_args['headers'] ) ) {
 312              $processedHeaders       = WP_Http::processHeaders( $parsed_args['headers'] );
 313              $parsed_args['headers'] = $processedHeaders['headers'];
 314          }
 315  
 316          // Setup arguments.
 317          $headers = $parsed_args['headers'];
 318          $data    = $parsed_args['body'];
 319          $type    = $parsed_args['method'];
 320          $options = array(
 321              'timeout'   => $parsed_args['timeout'],
 322              'useragent' => $parsed_args['user-agent'],
 323              'blocking'  => $parsed_args['blocking'],
 324              'hooks'     => new WP_HTTP_Requests_Hooks( $url, $parsed_args ),
 325          );
 326  
 327          // Ensure redirects follow browser behaviour.
 328          $options['hooks']->register( 'requests.before_redirect', array( get_class(), 'browser_redirect_compatibility' ) );
 329  
 330          // Validate redirected URLs.
 331          if ( function_exists( 'wp_kses_bad_protocol' ) && $parsed_args['reject_unsafe_urls'] ) {
 332              $options['hooks']->register( 'requests.before_redirect', array( get_class(), 'validate_redirects' ) );
 333          }
 334  
 335          if ( $parsed_args['stream'] ) {
 336              $options['filename'] = $parsed_args['filename'];
 337          }
 338          if ( empty( $parsed_args['redirection'] ) ) {
 339              $options['follow_redirects'] = false;
 340          } else {
 341              $options['redirects'] = $parsed_args['redirection'];
 342          }
 343  
 344          // Use byte limit, if we can.
 345          if ( isset( $parsed_args['limit_response_size'] ) ) {
 346              $options['max_bytes'] = $parsed_args['limit_response_size'];
 347          }
 348  
 349          // If we've got cookies, use and convert them to Requests_Cookie.
 350          if ( ! empty( $parsed_args['cookies'] ) ) {
 351              $options['cookies'] = WP_Http::normalize_cookies( $parsed_args['cookies'] );
 352          }
 353  
 354          // SSL certificate handling.
 355          if ( ! $parsed_args['sslverify'] ) {
 356              $options['verify']     = false;
 357              $options['verifyname'] = false;
 358          } else {
 359              $options['verify'] = $parsed_args['sslcertificates'];
 360          }
 361  
 362          // All non-GET/HEAD requests should put the arguments in the form body.
 363          if ( 'HEAD' !== $type && 'GET' !== $type ) {
 364              $options['data_format'] = 'body';
 365          }
 366  
 367          /**
 368           * Filters whether SSL should be verified for non-local requests.
 369           *
 370           * @since 2.8.0
 371           * @since 5.1.0 The `$url` parameter was added.
 372           *
 373           * @param bool   $ssl_verify Whether to verify the SSL connection. Default true.
 374           * @param string $url        The request URL.
 375           */
 376          $options['verify'] = apply_filters( 'https_ssl_verify', $options['verify'], $url );
 377  
 378          // Check for proxies.
 379          $proxy = new WP_HTTP_Proxy();
 380          if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) {
 381              $options['proxy'] = new Requests_Proxy_HTTP( $proxy->host() . ':' . $proxy->port() );
 382  
 383              if ( $proxy->use_authentication() ) {
 384                  $options['proxy']->use_authentication = true;
 385                  $options['proxy']->user               = $proxy->username();
 386                  $options['proxy']->pass               = $proxy->password();
 387              }
 388          }
 389  
 390          // Avoid issues where mbstring.func_overload is enabled.
 391          mbstring_binary_safe_encoding();
 392  
 393          try {
 394              $requests_response = Requests::request( $url, $headers, $data, $type, $options );
 395  
 396              // Convert the response into an array.
 397              $http_response = new WP_HTTP_Requests_Response( $requests_response, $parsed_args['filename'] );
 398              $response      = $http_response->to_array();
 399  
 400              // Add the original object to the array.
 401              $response['http_response'] = $http_response;
 402          } catch ( Requests_Exception $e ) {
 403              $response = new WP_Error( 'http_request_failed', $e->getMessage() );
 404          }
 405  
 406          reset_mbstring_encoding();
 407  
 408          /**
 409           * Fires after an HTTP API response is received and before the response is returned.
 410           *
 411           * @since 2.8.0
 412           *
 413           * @param array|WP_Error $response    HTTP response or WP_Error object.
 414           * @param string         $context     Context under which the hook is fired.
 415           * @param string         $class       HTTP transport used.
 416           * @param array          $parsed_args HTTP request arguments.
 417           * @param string         $url         The request URL.
 418           */
 419          do_action( 'http_api_debug', $response, 'response', 'Requests', $parsed_args, $url );
 420          if ( is_wp_error( $response ) ) {
 421              return $response;
 422          }
 423  
 424          if ( ! $parsed_args['blocking'] ) {
 425              return array(
 426                  'headers'       => array(),
 427                  'body'          => '',
 428                  'response'      => array(
 429                      'code'    => false,
 430                      'message' => false,
 431                  ),
 432                  'cookies'       => array(),
 433                  'http_response' => null,
 434              );
 435          }
 436  
 437          /**
 438           * Filters the HTTP API response immediately before the response is returned.
 439           *
 440           * @since 2.9.0
 441           *
 442           * @param array  $response    HTTP response.
 443           * @param array  $parsed_args HTTP request arguments.
 444           * @param string $url         The request URL.
 445           */
 446          return apply_filters( 'http_response', $response, $parsed_args, $url );
 447      }
 448  
 449      /**
 450       * Normalizes cookies for using in Requests.
 451       *
 452       * @since 4.6.0
 453       *
 454       * @param array $cookies Array of cookies to send with the request.
 455       * @return Requests_Cookie_Jar Cookie holder object.
 456       */
 457  	public static function normalize_cookies( $cookies ) {
 458          $cookie_jar = new Requests_Cookie_Jar();
 459  
 460          foreach ( $cookies as $name => $value ) {
 461              if ( $value instanceof WP_Http_Cookie ) {
 462                  $attributes                 = array_filter(
 463                      $value->get_attributes(),
 464                      static function( $attr ) {
 465                          return null !== $attr;
 466                      }
 467                  );
 468                  $cookie_jar[ $value->name ] = new Requests_Cookie( $value->name, $value->value, $attributes, array( 'host-only' => $value->host_only ) );
 469              } elseif ( is_scalar( $value ) ) {
 470                  $cookie_jar[ $name ] = new Requests_Cookie( $name, $value );
 471              }
 472          }
 473  
 474          return $cookie_jar;
 475      }
 476  
 477      /**
 478       * Match redirect behaviour to browser handling.
 479       *
 480       * Changes 302 redirects from POST to GET to match browser handling. Per
 481       * RFC 7231, user agents can deviate from the strict reading of the
 482       * specification for compatibility purposes.
 483       *
 484       * @since 4.6.0
 485       *
 486       * @param string            $location URL to redirect to.
 487       * @param array             $headers  Headers for the redirect.
 488       * @param string|array      $data     Body to send with the request.
 489       * @param array             $options  Redirect request options.
 490       * @param Requests_Response $original Response object.
 491       */
 492  	public static function browser_redirect_compatibility( $location, $headers, $data, &$options, $original ) {
 493          // Browser compatibility.
 494          if ( 302 === $original->status_code ) {
 495              $options['type'] = Requests::GET;
 496          }
 497      }
 498  
 499      /**
 500       * Validate redirected URLs.
 501       *
 502       * @since 4.7.5
 503       *
 504       * @throws Requests_Exception On unsuccessful URL validation.
 505       * @param string $location URL to redirect to.
 506       */
 507  	public static function validate_redirects( $location ) {
 508          if ( ! wp_http_validate_url( $location ) ) {
 509              throw new Requests_Exception( __( 'A valid URL was not provided.' ), 'wp_http.redirect_failed_validation' );
 510          }
 511      }
 512  
 513      /**
 514       * Tests which transports are capable of supporting the request.
 515       *
 516       * @since 3.2.0
 517       *
 518       * @param array  $args Request arguments.
 519       * @param string $url  URL to request.
 520       * @return string|false Class name for the first transport that claims to support the request.
 521       *                      False if no transport claims to support the request.
 522       */
 523  	public function _get_first_available_transport( $args, $url = null ) {
 524          $transports = array( 'curl', 'streams' );
 525  
 526          /**
 527           * Filters which HTTP transports are available and in what order.
 528           *
 529           * @since 3.7.0
 530           *
 531           * @param string[] $transports Array of HTTP transports to check. Default array contains
 532           *                             'curl' and 'streams', in that order.
 533           * @param array    $args       HTTP request arguments.
 534           * @param string   $url        The URL to request.
 535           */
 536          $request_order = apply_filters( 'http_api_transports', $transports, $args, $url );
 537  
 538          // Loop over each transport on each HTTP request looking for one which will serve this request's needs.
 539          foreach ( $request_order as $transport ) {
 540              if ( in_array( $transport, $transports, true ) ) {
 541                  $transport = ucfirst( $transport );
 542              }
 543              $class = 'WP_Http_' . $transport;
 544  
 545              // Check to see if this transport is a possibility, calls the transport statically.
 546              if ( ! call_user_func( array( $class, 'test' ), $args, $url ) ) {
 547                  continue;
 548              }
 549  
 550              return $class;
 551          }
 552  
 553          return false;
 554      }
 555  
 556      /**
 557       * Dispatches a HTTP request to a supporting transport.
 558       *
 559       * Tests each transport in order to find a transport which matches the request arguments.
 560       * Also caches the transport instance to be used later.
 561       *
 562       * The order for requests is cURL, and then PHP Streams.
 563       *
 564       * @since 3.2.0
 565       * @deprecated 5.1.0 Use WP_Http::request()
 566       * @see WP_Http::request()
 567       *
 568       * @param string $url  URL to request.
 569       * @param array  $args Request arguments.
 570       * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'.
 571       *                        A WP_Error instance upon error.
 572       */
 573  	private function _dispatch_request( $url, $args ) {
 574          static $transports = array();
 575  
 576          $class = $this->_get_first_available_transport( $args, $url );
 577          if ( ! $class ) {
 578              return new WP_Error( 'http_failure', __( 'There are no HTTP transports available which can complete the requested request.' ) );
 579          }
 580  
 581          // Transport claims to support request, instantiate it and give it a whirl.
 582          if ( empty( $transports[ $class ] ) ) {
 583              $transports[ $class ] = new $class;
 584          }
 585  
 586          $response = $transports[ $class ]->request( $url, $args );
 587  
 588          /** This action is documented in wp-includes/class-http.php */
 589          do_action( 'http_api_debug', $response, 'response', $class, $args, $url );
 590  
 591          if ( is_wp_error( $response ) ) {
 592              return $response;
 593          }
 594  
 595          /** This filter is documented in wp-includes/class-http.php */
 596          return apply_filters( 'http_response', $response, $args, $url );
 597      }
 598  
 599      /**
 600       * Uses the POST HTTP method.
 601       *
 602       * Used for sending data that is expected to be in the body.
 603       *
 604       * @since 2.7.0
 605       *
 606       * @param string       $url  The request URL.
 607       * @param string|array $args Optional. Override the defaults.
 608       * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'.
 609       *                        A WP_Error instance upon error.
 610       */
 611  	public function post( $url, $args = array() ) {
 612          $defaults    = array( 'method' => 'POST' );
 613          $parsed_args = wp_parse_args( $args, $defaults );
 614          return $this->request( $url, $parsed_args );
 615      }
 616  
 617      /**
 618       * Uses the GET HTTP method.
 619       *
 620       * Used for sending data that is expected to be in the body.
 621       *
 622       * @since 2.7.0
 623       *
 624       * @param string       $url  The request URL.
 625       * @param string|array $args Optional. Override the defaults.
 626       * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'.
 627       *                        A WP_Error instance upon error.
 628       */
 629  	public function get( $url, $args = array() ) {
 630          $defaults    = array( 'method' => 'GET' );
 631          $parsed_args = wp_parse_args( $args, $defaults );
 632          return $this->request( $url, $parsed_args );
 633      }
 634  
 635      /**
 636       * Uses the HEAD HTTP method.
 637       *
 638       * Used for sending data that is expected to be in the body.
 639       *
 640       * @since 2.7.0
 641       *
 642       * @param string       $url  The request URL.
 643       * @param string|array $args Optional. Override the defaults.
 644       * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'.
 645       *                        A WP_Error instance upon error.
 646       */
 647  	public function head( $url, $args = array() ) {
 648          $defaults    = array( 'method' => 'HEAD' );
 649          $parsed_args = wp_parse_args( $args, $defaults );
 650          return $this->request( $url, $parsed_args );
 651      }
 652  
 653      /**
 654       * Parses the responses and splits the parts into headers and body.
 655       *
 656       * @since 2.7.0
 657       *
 658       * @param string $strResponse The full response string.
 659       * @return array {
 660       *     Array with response headers and body.
 661       *
 662       *     @type string $headers HTTP response headers.
 663       *     @type string $body    HTTP response body.
 664       * }
 665       */
 666  	public static function processResponse( $strResponse ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.MethodNameInvalid
 667          $res = explode( "\r\n\r\n", $strResponse, 2 );
 668  
 669          return array(
 670              'headers' => $res[0],
 671              'body'    => isset( $res[1] ) ? $res[1] : '',
 672          );
 673      }
 674  
 675      /**
 676       * Transforms header string into an array.
 677       *
 678       * @since 2.7.0
 679       *
 680       * @param string|array $headers The original headers. If a string is passed, it will be converted
 681       *                              to an array. If an array is passed, then it is assumed to be
 682       *                              raw header data with numeric keys with the headers as the values.
 683       *                              No headers must be passed that were already processed.
 684       * @param string       $url     Optional. The URL that was requested. Default empty.
 685       * @return array {
 686       *     Processed string headers. If duplicate headers are encountered,
 687       *     then a numbered array is returned as the value of that header-key.
 688       *
 689       *     @type array            $response {
 690       *          @type int    $code    The response status code. Default 0.
 691       *          @type string $message The response message. Default empty.
 692       *     }
 693       *     @type array            $newheaders The processed header data as a multidimensional array.
 694       *     @type WP_Http_Cookie[] $cookies    If the original headers contain the 'Set-Cookie' key,
 695       *                                        an array containing `WP_Http_Cookie` objects is returned.
 696       * }
 697       */
 698  	public static function processHeaders( $headers, $url = '' ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.MethodNameInvalid
 699          // Split headers, one per array element.
 700          if ( is_string( $headers ) ) {
 701              // Tolerate line terminator: CRLF = LF (RFC 2616 19.3).
 702              $headers = str_replace( "\r\n", "\n", $headers );
 703              /*
 704               * Unfold folded header fields. LWS = [CRLF] 1*( SP | HT ) <US-ASCII SP, space (32)>,
 705               * <US-ASCII HT, horizontal-tab (9)> (RFC 2616 2.2).
 706               */
 707              $headers = preg_replace( '/\n[ \t]/', ' ', $headers );
 708              // Create the headers array.
 709              $headers = explode( "\n", $headers );
 710          }
 711  
 712          $response = array(
 713              'code'    => 0,
 714              'message' => '',
 715          );
 716  
 717          /*
 718           * If a redirection has taken place, The headers for each page request may have been passed.
 719           * In this case, determine the final HTTP header and parse from there.
 720           */
 721          for ( $i = count( $headers ) - 1; $i >= 0; $i-- ) {
 722              if ( ! empty( $headers[ $i ] ) && false === strpos( $headers[ $i ], ':' ) ) {
 723                  $headers = array_splice( $headers, $i );
 724                  break;
 725              }
 726          }
 727  
 728          $cookies    = array();
 729          $newheaders = array();
 730          foreach ( (array) $headers as $tempheader ) {
 731              if ( empty( $tempheader ) ) {
 732                  continue;
 733              }
 734  
 735              if ( false === strpos( $tempheader, ':' ) ) {
 736                  $stack   = explode( ' ', $tempheader, 3 );
 737                  $stack[] = '';
 738                  list( , $response['code'], $response['message']) = $stack;
 739                  continue;
 740              }
 741  
 742              list($key, $value) = explode( ':', $tempheader, 2 );
 743  
 744              $key   = strtolower( $key );
 745              $value = trim( $value );
 746  
 747              if ( isset( $newheaders[ $key ] ) ) {
 748                  if ( ! is_array( $newheaders[ $key ] ) ) {
 749                      $newheaders[ $key ] = array( $newheaders[ $key ] );
 750                  }
 751                  $newheaders[ $key ][] = $value;
 752              } else {
 753                  $newheaders[ $key ] = $value;
 754              }
 755              if ( 'set-cookie' === $key ) {
 756                  $cookies[] = new WP_Http_Cookie( $value, $url );
 757              }
 758          }
 759  
 760          // Cast the Response Code to an int.
 761          $response['code'] = (int) $response['code'];
 762  
 763          return array(
 764              'response' => $response,
 765              'headers'  => $newheaders,
 766              'cookies'  => $cookies,
 767          );
 768      }
 769  
 770      /**
 771       * Takes the arguments for a ::request() and checks for the cookie array.
 772       *
 773       * If it's found, then it upgrades any basic name => value pairs to WP_Http_Cookie instances,
 774       * which are each parsed into strings and added to the Cookie: header (within the arguments array).
 775       * Edits the array by reference.
 776       *
 777       * @since 2.8.0
 778       *
 779       * @param array $r Full array of args passed into ::request()
 780       */
 781  	public static function buildCookieHeader( &$r ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.MethodNameInvalid
 782          if ( ! empty( $r['cookies'] ) ) {
 783              // Upgrade any name => value cookie pairs to WP_HTTP_Cookie instances.
 784              foreach ( $r['cookies'] as $name => $value ) {
 785                  if ( ! is_object( $value ) ) {
 786                      $r['cookies'][ $name ] = new WP_Http_Cookie(
 787                          array(
 788                              'name'  => $name,
 789                              'value' => $value,
 790                          )
 791                      );
 792                  }
 793              }
 794  
 795              $cookies_header = '';
 796              foreach ( (array) $r['cookies'] as $cookie ) {
 797                  $cookies_header .= $cookie->getHeaderValue() . '; ';
 798              }
 799  
 800              $cookies_header         = substr( $cookies_header, 0, -2 );
 801              $r['headers']['cookie'] = $cookies_header;
 802          }
 803      }
 804  
 805      /**
 806       * Decodes chunk transfer-encoding, based off the HTTP 1.1 specification.
 807       *
 808       * Based off the HTTP http_encoding_dechunk function.
 809       *
 810       * @link https://tools.ietf.org/html/rfc2616#section-19.4.6 Process for chunked decoding.
 811       *
 812       * @since 2.7.0
 813       *
 814       * @param string $body Body content.
 815       * @return string Chunked decoded body on success or raw body on failure.
 816       */
 817  	public static function chunkTransferDecode( $body ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.MethodNameInvalid
 818          // The body is not chunked encoded or is malformed.
 819          if ( ! preg_match( '/^([0-9a-f]+)[^\r\n]*\r\n/i', trim( $body ) ) ) {
 820              return $body;
 821          }
 822  
 823          $parsed_body = '';
 824  
 825          // We'll be altering $body, so need a backup in case of error.
 826          $body_original = $body;
 827  
 828          while ( true ) {
 829              $has_chunk = (bool) preg_match( '/^([0-9a-f]+)[^\r\n]*\r\n/i', $body, $match );
 830              if ( ! $has_chunk || empty( $match[1] ) ) {
 831                  return $body_original;
 832              }
 833  
 834              $length       = hexdec( $match[1] );
 835              $chunk_length = strlen( $match[0] );
 836  
 837              // Parse out the chunk of data.
 838              $parsed_body .= substr( $body, $chunk_length, $length );
 839  
 840              // Remove the chunk from the raw data.
 841              $body = substr( $body, $length + $chunk_length );
 842  
 843              // End of the document.
 844              if ( '0' === trim( $body ) ) {
 845                  return $parsed_body;
 846              }
 847          }
 848      }
 849  
 850      /**
 851       * Determines whether an HTTP API request to the given URL should be blocked.
 852       *
 853       * Those who are behind a proxy and want to prevent access to certain hosts may do so. This will
 854       * prevent plugins from working and core functionality, if you don't include `api.wordpress.org`.
 855       *
 856       * You block external URL requests by defining `WP_HTTP_BLOCK_EXTERNAL` as true in your `wp-config.php`
 857       * file and this will only allow localhost and your site to make requests. The constant
 858       * `WP_ACCESSIBLE_HOSTS` will allow additional hosts to go through for requests. The format of the
 859       * `WP_ACCESSIBLE_HOSTS` constant is a comma separated list of hostnames to allow, wildcard domains
 860       * are supported, eg `*.wordpress.org` will allow for all subdomains of `wordpress.org` to be contacted.
 861       *
 862       * @since 2.8.0
 863       *
 864       * @link https://core.trac.wordpress.org/ticket/8927 Allow preventing external requests.
 865       * @link https://core.trac.wordpress.org/ticket/14636 Allow wildcard domains in WP_ACCESSIBLE_HOSTS
 866       *
 867       * @param string $uri URI of url.
 868       * @return bool True to block, false to allow.
 869       */
 870  	public function block_request( $uri ) {
 871          // We don't need to block requests, because nothing is blocked.
 872          if ( ! defined( 'WP_HTTP_BLOCK_EXTERNAL' ) || ! WP_HTTP_BLOCK_EXTERNAL ) {
 873              return false;
 874          }
 875  
 876          $check = parse_url( $uri );
 877          if ( ! $check ) {
 878              return true;
 879          }
 880  
 881          $home = parse_url( get_option( 'siteurl' ) );
 882  
 883          // Don't block requests back to ourselves by default.
 884          if ( 'localhost' === $check['host'] || ( isset( $home['host'] ) && $home['host'] == $check['host'] ) ) {
 885              /**
 886               * Filters whether to block local HTTP API requests.
 887               *
 888               * A local request is one to `localhost` or to the same host as the site itself.
 889               *
 890               * @since 2.8.0
 891               *
 892               * @param bool $block Whether to block local requests. Default false.
 893               */
 894              return apply_filters( 'block_local_requests', false );
 895          }
 896  
 897          if ( ! defined( 'WP_ACCESSIBLE_HOSTS' ) ) {
 898              return true;
 899          }
 900  
 901          static $accessible_hosts = null;
 902          static $wildcard_regex   = array();
 903          if ( null === $accessible_hosts ) {
 904              $accessible_hosts = preg_split( '|,\s*|', WP_ACCESSIBLE_HOSTS );
 905  
 906              if ( false !== strpos( WP_ACCESSIBLE_HOSTS, '*' ) ) {
 907                  $wildcard_regex = array();
 908                  foreach ( $accessible_hosts as $host ) {
 909                      $wildcard_regex[] = str_replace( '\*', '.+', preg_quote( $host, '/' ) );
 910                  }
 911                  $wildcard_regex = '/^(' . implode( '|', $wildcard_regex ) . ')$/i';
 912              }
 913          }
 914  
 915          if ( ! empty( $wildcard_regex ) ) {
 916              return ! preg_match( $wildcard_regex, $check['host'] );
 917          } else {
 918              return ! in_array( $check['host'], $accessible_hosts, true ); // Inverse logic, if it's in the array, then don't block it.
 919          }
 920  
 921      }
 922  
 923      /**
 924       * Used as a wrapper for PHP's parse_url() function that handles edgecases in < PHP 5.4.7.
 925       *
 926       * @deprecated 4.4.0 Use wp_parse_url()
 927       * @see wp_parse_url()
 928       *
 929       * @param string $url The URL to parse.
 930       * @return bool|array False on failure; Array of URL components on success;
 931       *                    See parse_url()'s return values.
 932       */
 933  	protected static function parse_url( $url ) {
 934          _deprecated_function( __METHOD__, '4.4.0', 'wp_parse_url()' );
 935          return wp_parse_url( $url );
 936      }
 937  
 938      /**
 939       * Converts a relative URL to an absolute URL relative to a given URL.
 940       *
 941       * If an Absolute URL is provided, no processing of that URL is done.
 942       *
 943       * @since 3.4.0
 944       *
 945       * @param string $maybe_relative_path The URL which might be relative.
 946       * @param string $url                 The URL which $maybe_relative_path is relative to.
 947       * @return string An Absolute URL, in a failure condition where the URL cannot be parsed, the relative URL will be returned.
 948       */
 949  	public static function make_absolute_url( $maybe_relative_path, $url ) {
 950          if ( empty( $url ) ) {
 951              return $maybe_relative_path;
 952          }
 953  
 954          $url_parts = wp_parse_url( $url );
 955          if ( ! $url_parts ) {
 956              return $maybe_relative_path;
 957          }
 958  
 959          $relative_url_parts = wp_parse_url( $maybe_relative_path );
 960          if ( ! $relative_url_parts ) {
 961              return $maybe_relative_path;
 962          }
 963  
 964          // Check for a scheme on the 'relative' URL.
 965          if ( ! empty( $relative_url_parts['scheme'] ) ) {
 966              return $maybe_relative_path;
 967          }
 968  
 969          $absolute_path = $url_parts['scheme'] . '://';
 970  
 971          // Schemeless URLs will make it this far, so we check for a host in the relative URL
 972          // and convert it to a protocol-URL.
 973          if ( isset( $relative_url_parts['host'] ) ) {
 974              $absolute_path .= $relative_url_parts['host'];
 975              if ( isset( $relative_url_parts['port'] ) ) {
 976                  $absolute_path .= ':' . $relative_url_parts['port'];
 977              }
 978          } else {
 979              $absolute_path .= $url_parts['host'];
 980              if ( isset( $url_parts['port'] ) ) {
 981                  $absolute_path .= ':' . $url_parts['port'];
 982              }
 983          }
 984  
 985          // Start off with the absolute URL path.
 986          $path = ! empty( $url_parts['path'] ) ? $url_parts['path'] : '/';
 987  
 988          // If it's a root-relative path, then great.
 989          if ( ! empty( $relative_url_parts['path'] ) && '/' === $relative_url_parts['path'][0] ) {
 990              $path = $relative_url_parts['path'];
 991  
 992              // Else it's a relative path.
 993          } elseif ( ! empty( $relative_url_parts['path'] ) ) {
 994              // Strip off any file components from the absolute path.
 995              $path = substr( $path, 0, strrpos( $path, '/' ) + 1 );
 996  
 997              // Build the new path.
 998              $path .= $relative_url_parts['path'];
 999  
1000              // Strip all /path/../ out of the path.
1001              while ( strpos( $path, '../' ) > 1 ) {
1002                  $path = preg_replace( '![^/]+/\.\./!', '', $path );
1003              }
1004  
1005              // Strip any final leading ../ from the path.
1006              $path = preg_replace( '!^/(\.\./)+!', '', $path );
1007          }
1008  
1009          // Add the query string.
1010          if ( ! empty( $relative_url_parts['query'] ) ) {
1011              $path .= '?' . $relative_url_parts['query'];
1012          }
1013  
1014          return $absolute_path . '/' . ltrim( $path, '/' );
1015      }
1016  
1017      /**
1018       * Handles an HTTP redirect and follows it if appropriate.
1019       *
1020       * @since 3.7.0
1021       *
1022       * @param string $url      The URL which was requested.
1023       * @param array  $args     The arguments which were used to make the request.
1024       * @param array  $response The response of the HTTP request.
1025       * @return array|false|WP_Error An HTTP API response array if the redirect is successfully followed,
1026       *                              false if no redirect is present, or a WP_Error object if there's an error.
1027       */
1028  	public static function handle_redirects( $url, $args, $response ) {
1029          // If no redirects are present, or, redirects were not requested, perform no action.
1030          if ( ! isset( $response['headers']['location'] ) || 0 === $args['_redirection'] ) {
1031              return false;
1032          }
1033  
1034          // Only perform redirections on redirection http codes.
1035          if ( $response['response']['code'] > 399 || $response['response']['code'] < 300 ) {
1036              return false;
1037          }
1038  
1039          // Don't redirect if we've run out of redirects.
1040          if ( $args['redirection']-- <= 0 ) {
1041              return new WP_Error( 'http_request_failed', __( 'Too many redirects.' ) );
1042          }
1043  
1044          $redirect_location = $response['headers']['location'];
1045  
1046          // If there were multiple Location headers, use the last header specified.
1047          if ( is_array( $redirect_location ) ) {
1048              $redirect_location = array_pop( $redirect_location );
1049          }
1050  
1051          $redirect_location = WP_Http::make_absolute_url( $redirect_location, $url );
1052  
1053          // POST requests should not POST to a redirected location.
1054          if ( 'POST' === $args['method'] ) {
1055              if ( in_array( $response['response']['code'], array( 302, 303 ), true ) ) {
1056                  $args['method'] = 'GET';
1057              }
1058          }
1059  
1060          // Include valid cookies in the redirect process.
1061          if ( ! empty( $response['cookies'] ) ) {
1062              foreach ( $response['cookies'] as $cookie ) {
1063                  if ( $cookie->test( $redirect_location ) ) {
1064                      $args['cookies'][] = $cookie;
1065                  }
1066              }
1067          }
1068  
1069          return wp_remote_request( $redirect_location, $args );
1070      }
1071  
1072      /**
1073       * Determines if a specified string represents an IP address or not.
1074       *
1075       * This function also detects the type of the IP address, returning either
1076       * '4' or '6' to represent a IPv4 and IPv6 address respectively.
1077       * This does not verify if the IP is a valid IP, only that it appears to be
1078       * an IP address.
1079       *
1080       * @link http://home.deds.nl/~aeron/regex/ for IPv6 regex.
1081       *
1082       * @since 3.7.0
1083       *
1084       * @param string $maybe_ip A suspected IP address.
1085       * @return int|false Upon success, '4' or '6' to represent a IPv4 or IPv6 address, false upon failure
1086       */
1087  	public static function is_ip_address( $maybe_ip ) {
1088          if ( preg_match( '/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $maybe_ip ) ) {
1089              return 4;
1090          }
1091  
1092          if ( false !== strpos( $maybe_ip, ':' ) && preg_match( '/^(((?=.*(::))(?!.*\3.+\3))\3?|([\dA-F]{1,4}(\3|:\b|$)|\2))(?4){5}((?4){2}|(((2[0-4]|1\d|[1-9])?\d|25[0-5])\.?\b){4})$/i', trim( $maybe_ip, ' []' ) ) ) {
1093              return 6;
1094          }
1095  
1096          return false;
1097      }
1098  
1099  }


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