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1 <?php 2 /** 3 * Simple and uniform HTTP request API. 4 * 5 * Standardizes the HTTP requests for WordPress. Handles cookies, gzip encoding and decoding, chunk 6 * decoding, if HTTP 1.1 and various other difficult HTTP protocol implementations. 7 * 8 * @link http://trac.wordpress.org/ticket/4779 HTTP API Proposal 9 * 10 * @package WordPress 11 * @subpackage HTTP 12 * @since 2.7.0 13 */ 14 15 /** 16 * WordPress HTTP Class for managing HTTP Transports and making HTTP requests. 17 * 18 * This class is used to consistently make outgoing HTTP requests easy for developers 19 * while still being compatible with the many PHP configurations under which 20 * WordPress runs. 21 * 22 * Debugging includes several actions, which pass different variables for debugging the HTTP API. 23 * 24 * @package WordPress 25 * @subpackage HTTP 26 * @since 2.7.0 27 */ 28 class WP_Http { 29 30 /** 31 * Send a HTTP request to a URI. 32 * 33 * The body and headers are part of the arguments. The 'body' argument is for the body and will 34 * accept either a string or an array. The 'headers' argument should be an array, but a string 35 * is acceptable. If the 'body' argument is an array, then it will automatically be escaped 36 * using http_build_query(). 37 * 38 * The only URI that are supported in the HTTP Transport implementation are the HTTP and HTTPS 39 * protocols. 40 * 41 * The defaults are 'method', 'timeout', 'redirection', 'httpversion', 'blocking' and 42 * 'user-agent'. 43 * 44 * Accepted 'method' values are 'GET', 'POST', and 'HEAD', some transports technically allow 45 * others, but should not be assumed. The 'timeout' is used to sent how long the connection 46 * should stay open before failing when no response. 'redirection' is used to track how many 47 * redirects were taken and used to sent the amount for other transports, but not all transports 48 * accept setting that value. 49 * 50 * The 'httpversion' option is used to sent the HTTP version and accepted values are '1.0', and 51 * '1.1' and should be a string. The 'user-agent' option is the user-agent and is used to 52 * replace the default user-agent, which is 'WordPress/WP_Version', where WP_Version is the 53 * value from $wp_version. 54 * 55 * The 'blocking' parameter can be used to specify if the calling code requires the result of 56 * the HTTP request. If set to false, the request will be sent to the remote server, and 57 * processing returned to the calling code immediately, the caller will know if the request 58 * suceeded or failed, but will not receive any response from the remote server. 59 * 60 * @access public 61 * @since 2.7.0 62 * 63 * @param string $url URI resource. 64 * @param str|array $args Optional. Override the defaults. 65 * @return array|object Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error 66 */ 67 function request( $url, $args = array() ) { 68 global $wp_version; 69 70 $defaults = array( 71 'method' => 'GET', 72 'timeout' => apply_filters( 'http_request_timeout', 5), 73 'redirection' => apply_filters( 'http_request_redirection_count', 5), 74 'httpversion' => apply_filters( 'http_request_version', '1.0'), 75 'user-agent' => apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' ) ), 76 'reject_unsafe_urls' => apply_filters( 'http_request_reject_unsafe_urls', false ), 77 'blocking' => true, 78 'headers' => array(), 79 'cookies' => array(), 80 'body' => null, 81 'compress' => false, 82 'decompress' => true, 83 'sslverify' => true, 84 'sslcertificates' => ABSPATH . WPINC . '/certificates/ca-bundle.crt', 85 'stream' => false, 86 'filename' => null, 87 'limit_response_size' => null, 88 ); 89 90 // Pre-parse for the HEAD checks. 91 $args = wp_parse_args( $args ); 92 93 // By default, Head requests do not cause redirections. 94 if ( isset($args['method']) && 'HEAD' == $args['method'] ) 95 $defaults['redirection'] = 0; 96 97 $r = wp_parse_args( $args, $defaults ); 98 $r = apply_filters( 'http_request_args', $r, $url ); 99 100 // The transports decrement this, store a copy of the original value for loop purposes. 101 if ( ! isset( $r['_redirection'] ) ) 102 $r['_redirection'] = $r['redirection']; 103 104 // Allow plugins to short-circuit the request 105 $pre = apply_filters( 'pre_http_request', false, $r, $url ); 106 if ( false !== $pre ) 107 return $pre; 108 109 if ( function_exists( 'wp_kses_bad_protocol' ) ) { 110 if ( $r['reject_unsafe_urls'] ) 111 $url = wp_http_validate_url( $url ); 112 $url = wp_kses_bad_protocol( $url, array( 'http', 'https', 'ssl' ) ); 113 } 114 115 $arrURL = @parse_url( $url ); 116 117 if ( empty( $url ) || empty( $arrURL['scheme'] ) ) 118 return new WP_Error('http_request_failed', __('A valid URL was not provided.')); 119 120 if ( $this->block_request( $url ) ) 121 return new WP_Error( 'http_request_failed', __( 'User has blocked requests through HTTP.' ) ); 122 123 // Determine if this is a https call and pass that on to the transport functions 124 // so that we can blacklist the transports that do not support ssl verification 125 $r['ssl'] = $arrURL['scheme'] == 'https' || $arrURL['scheme'] == 'ssl'; 126 127 // Determine if this request is to OUR install of WordPress 128 $homeURL = parse_url( get_bloginfo( 'url' ) ); 129 $r['local'] = $homeURL['host'] == $arrURL['host'] || 'localhost' == $arrURL['host']; 130 unset( $homeURL ); 131 132 // If we are streaming to a file but no filename was given drop it in the WP temp dir 133 // and pick its name using the basename of the $url 134 if ( $r['stream'] && empty( $r['filename'] ) ) 135 $r['filename'] = get_temp_dir() . basename( $url ); 136 137 // Force some settings if we are streaming to a file and check for existence and perms of destination directory 138 if ( $r['stream'] ) { 139 $r['blocking'] = true; 140 if ( ! wp_is_writable( dirname( $r['filename'] ) ) ) 141 return new WP_Error( 'http_request_failed', __( 'Destination directory for file streaming does not exist or is not writable.' ) ); 142 } 143 144 if ( is_null( $r['headers'] ) ) 145 $r['headers'] = array(); 146 147 if ( ! is_array( $r['headers'] ) ) { 148 $processedHeaders = WP_Http::processHeaders( $r['headers'], $url ); 149 $r['headers'] = $processedHeaders['headers']; 150 } 151 152 if ( isset( $r['headers']['User-Agent'] ) ) { 153 $r['user-agent'] = $r['headers']['User-Agent']; 154 unset( $r['headers']['User-Agent'] ); 155 } 156 157 if ( isset( $r['headers']['user-agent'] ) ) { 158 $r['user-agent'] = $r['headers']['user-agent']; 159 unset( $r['headers']['user-agent'] ); 160 } 161 162 if ( '1.1' == $r['httpversion'] && !isset( $r['headers']['connection'] ) ) { 163 $r['headers']['connection'] = 'close'; 164 } 165 166 // Construct Cookie: header if any cookies are set 167 WP_Http::buildCookieHeader( $r ); 168 169 // Avoid issues where mbstring.func_overload is enabled 170 mbstring_binary_safe_encoding(); 171 172 if ( ! isset( $r['headers']['Accept-Encoding'] ) ) { 173 if ( $encoding = WP_Http_Encoding::accept_encoding( $url, $r ) ) 174 $r['headers']['Accept-Encoding'] = $encoding; 175 } 176 177 if ( ( ! is_null( $r['body'] ) && '' != $r['body'] ) || 'POST' == $r['method'] || 'PUT' == $r['method'] ) { 178 if ( is_array( $r['body'] ) || is_object( $r['body'] ) ) { 179 $r['body'] = http_build_query( $r['body'], null, '&' ); 180 181 if ( ! isset( $r['headers']['Content-Type'] ) ) 182 $r['headers']['Content-Type'] = 'application/x-www-form-urlencoded; charset=' . get_option( 'blog_charset' ); 183 } 184 185 if ( '' === $r['body'] ) 186 $r['body'] = null; 187 188 if ( ! isset( $r['headers']['Content-Length'] ) && ! isset( $r['headers']['content-length'] ) ) 189 $r['headers']['Content-Length'] = strlen( $r['body'] ); 190 } 191 192 $response = $this->_dispatch_request( $url, $r ); 193 194 reset_mbstring_encoding(); 195 196 if ( is_wp_error( $response ) ) 197 return $response; 198 199 // Append cookies that were used in this request to the response 200 if ( ! empty( $r['cookies'] ) ) { 201 $cookies_set = wp_list_pluck( $response['cookies'], 'name' ); 202 foreach ( $r['cookies'] as $cookie ) { 203 if ( ! in_array( $cookie->name, $cookies_set ) && $cookie->test( $url ) ) { 204 $response['cookies'][] = $cookie; 205 } 206 } 207 } 208 209 return $response; 210 } 211 212 /** 213 * Tests which transports are capable of supporting the request. 214 * 215 * @since 3.2.0 216 * @access private 217 * 218 * @param array $args Request arguments 219 * @param string $url URL to Request 220 * 221 * @return string|bool Class name for the first transport that claims to support the request. False if no transport claims to support the request. 222 */ 223 public function _get_first_available_transport( $args, $url = null ) { 224 $request_order = apply_filters( 'http_api_transports', array( 'curl', 'streams' ), $args, $url ); 225 226 // Loop over each transport on each HTTP request looking for one which will serve this request's needs 227 foreach ( $request_order as $transport ) { 228 $class = 'WP_HTTP_' . $transport; 229 230 // Check to see if this transport is a possibility, calls the transport statically 231 if ( !call_user_func( array( $class, 'test' ), $args, $url ) ) 232 continue; 233 234 return $class; 235 } 236 237 return false; 238 } 239 240 /** 241 * Dispatches a HTTP request to a supporting transport. 242 * 243 * Tests each transport in order to find a transport which matches the request arguments. 244 * Also caches the transport instance to be used later. 245 * 246 * The order for requests is cURL, and then PHP Streams. 247 * 248 * @since 3.2.0 249 * @access private 250 * 251 * @param string $url URL to Request 252 * @param array $args Request arguments 253 * @return array|object Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error 254 */ 255 private function _dispatch_request( $url, $args ) { 256 static $transports = array(); 257 258 $class = $this->_get_first_available_transport( $args, $url ); 259 if ( !$class ) 260 return new WP_Error( 'http_failure', __( 'There are no HTTP transports available which can complete the requested request.' ) ); 261 262 // Transport claims to support request, instantiate it and give it a whirl. 263 if ( empty( $transports[$class] ) ) 264 $transports[$class] = new $class; 265 266 $response = $transports[$class]->request( $url, $args ); 267 268 do_action( 'http_api_debug', $response, 'response', $class, $args, $url ); 269 270 if ( is_wp_error( $response ) ) 271 return $response; 272 273 return apply_filters( 'http_response', $response, $args, $url ); 274 } 275 276 /** 277 * Uses the POST HTTP method. 278 * 279 * Used for sending data that is expected to be in the body. 280 * 281 * @access public 282 * @since 2.7.0 283 * 284 * @param string $url URI resource. 285 * @param str|array $args Optional. Override the defaults. 286 * @return array|object Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error 287 */ 288 function post($url, $args = array()) { 289 $defaults = array('method' => 'POST'); 290 $r = wp_parse_args( $args, $defaults ); 291 return $this->request($url, $r); 292 } 293 294 /** 295 * Uses the GET HTTP method. 296 * 297 * Used for sending data that is expected to be in the body. 298 * 299 * @access public 300 * @since 2.7.0 301 * 302 * @param string $url URI resource. 303 * @param str|array $args Optional. Override the defaults. 304 * @return array|object Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error 305 */ 306 function get($url, $args = array()) { 307 $defaults = array('method' => 'GET'); 308 $r = wp_parse_args( $args, $defaults ); 309 return $this->request($url, $r); 310 } 311 312 /** 313 * Uses the HEAD HTTP method. 314 * 315 * Used for sending data that is expected to be in the body. 316 * 317 * @access public 318 * @since 2.7.0 319 * 320 * @param string $url URI resource. 321 * @param str|array $args Optional. Override the defaults. 322 * @return array|object Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error 323 */ 324 function head($url, $args = array()) { 325 $defaults = array('method' => 'HEAD'); 326 $r = wp_parse_args( $args, $defaults ); 327 return $this->request($url, $r); 328 } 329 330 /** 331 * Parses the responses and splits the parts into headers and body. 332 * 333 * @access public 334 * @static 335 * @since 2.7.0 336 * 337 * @param string $strResponse The full response string 338 * @return array Array with 'headers' and 'body' keys. 339 */ 340 public static function processResponse($strResponse) { 341 $res = explode("\r\n\r\n", $strResponse, 2); 342 343 return array('headers' => $res[0], 'body' => isset($res[1]) ? $res[1] : ''); 344 } 345 346 /** 347 * Transform header string into an array. 348 * 349 * If an array is given then it is assumed to be raw header data with numeric keys with the 350 * headers as the values. No headers must be passed that were already processed. 351 * 352 * @access public 353 * @static 354 * @since 2.7.0 355 * 356 * @param string|array $headers 357 * @param string $url The URL that was requested 358 * @return array Processed string headers. If duplicate headers are encountered, 359 * Then a numbered array is returned as the value of that header-key. 360 */ 361 public static function processHeaders( $headers, $url = '' ) { 362 // split headers, one per array element 363 if ( is_string($headers) ) { 364 // tolerate line terminator: CRLF = LF (RFC 2616 19.3) 365 $headers = str_replace("\r\n", "\n", $headers); 366 // unfold folded header fields. LWS = [CRLF] 1*( SP | HT ) <US-ASCII SP, space (32)>, <US-ASCII HT, horizontal-tab (9)> (RFC 2616 2.2) 367 $headers = preg_replace('/\n[ \t]/', ' ', $headers); 368 // create the headers array 369 $headers = explode("\n", $headers); 370 } 371 372 $response = array('code' => 0, 'message' => ''); 373 374 // If a redirection has taken place, The headers for each page request may have been passed. 375 // In this case, determine the final HTTP header and parse from there. 376 for ( $i = count($headers)-1; $i >= 0; $i-- ) { 377 if ( !empty($headers[$i]) && false === strpos($headers[$i], ':') ) { 378 $headers = array_splice($headers, $i); 379 break; 380 } 381 } 382 383 $cookies = array(); 384 $newheaders = array(); 385 foreach ( (array) $headers as $tempheader ) { 386 if ( empty($tempheader) ) 387 continue; 388 389 if ( false === strpos($tempheader, ':') ) { 390 $stack = explode(' ', $tempheader, 3); 391 $stack[] = ''; 392 list( , $response['code'], $response['message']) = $stack; 393 continue; 394 } 395 396 list($key, $value) = explode(':', $tempheader, 2); 397 398 $key = strtolower( $key ); 399 $value = trim( $value ); 400 401 if ( isset( $newheaders[ $key ] ) ) { 402 if ( ! is_array( $newheaders[ $key ] ) ) 403 $newheaders[$key] = array( $newheaders[ $key ] ); 404 $newheaders[ $key ][] = $value; 405 } else { 406 $newheaders[ $key ] = $value; 407 } 408 if ( 'set-cookie' == $key ) 409 $cookies[] = new WP_Http_Cookie( $value, $url ); 410 } 411 412 return array('response' => $response, 'headers' => $newheaders, 'cookies' => $cookies); 413 } 414 415 /** 416 * Takes the arguments for a ::request() and checks for the cookie array. 417 * 418 * If it's found, then it upgrades any basic name => value pairs to WP_Http_Cookie instances, 419 * which are each parsed into strings and added to the Cookie: header (within the arguments array). 420 * Edits the array by reference. 421 * 422 * @access public 423 * @version 2.8.0 424 * @static 425 * 426 * @param array $r Full array of args passed into ::request() 427 */ 428 public static function buildCookieHeader( &$r ) { 429 if ( ! empty($r['cookies']) ) { 430 // Upgrade any name => value cookie pairs to WP_HTTP_Cookie instances 431 foreach ( $r['cookies'] as $name => $value ) { 432 if ( ! is_object( $value ) ) 433 $r['cookies'][ $name ] = new WP_HTTP_Cookie( array( 'name' => $name, 'value' => $value ) ); 434 } 435 436 $cookies_header = ''; 437 foreach ( (array) $r['cookies'] as $cookie ) { 438 $cookies_header .= $cookie->getHeaderValue() . '; '; 439 } 440 441 $cookies_header = substr( $cookies_header, 0, -2 ); 442 $r['headers']['cookie'] = $cookies_header; 443 } 444 } 445 446 /** 447 * Decodes chunk transfer-encoding, based off the HTTP 1.1 specification. 448 * 449 * Based off the HTTP http_encoding_dechunk function. 450 * 451 * @link http://tools.ietf.org/html/rfc2616#section-19.4.6 Process for chunked decoding. 452 * 453 * @access public 454 * @since 2.7.0 455 * @static 456 * 457 * @param string $body Body content 458 * @return string Chunked decoded body on success or raw body on failure. 459 */ 460 public static function chunkTransferDecode( $body ) { 461 // The body is not chunked encoded or is malformed. 462 if ( ! preg_match( '/^([0-9a-f]+)[^\r\n]*\r\n/i', trim( $body ) ) ) 463 return $body; 464 465 $parsed_body = ''; 466 $body_original = $body; // We'll be altering $body, so need a backup in case of error 467 468 while ( true ) { 469 $has_chunk = (bool) preg_match( '/^([0-9a-f]+)[^\r\n]*\r\n/i', $body, $match ); 470 if ( ! $has_chunk || empty( $match[1] ) ) 471 return $body_original; 472 473 $length = hexdec( $match[1] ); 474 $chunk_length = strlen( $match[0] ); 475 476 // Parse out the chunk of data 477 $parsed_body .= substr( $body, $chunk_length, $length ); 478 479 // Remove the chunk from the raw data 480 $body = substr( $body, $length + $chunk_length ); 481 482 // End of document 483 if ( '0' === trim( $body ) ) 484 return $parsed_body; 485 } 486 } 487 488 /** 489 * Block requests through the proxy. 490 * 491 * Those who are behind a proxy and want to prevent access to certain hosts may do so. This will 492 * prevent plugins from working and core functionality, if you don't include api.wordpress.org. 493 * 494 * You block external URL requests by defining WP_HTTP_BLOCK_EXTERNAL as true in your wp-config.php 495 * file and this will only allow localhost and your blog to make requests. The constant 496 * WP_ACCESSIBLE_HOSTS will allow additional hosts to go through for requests. The format of the 497 * WP_ACCESSIBLE_HOSTS constant is a comma separated list of hostnames to allow, wildcard domains 498 * are supported, eg *.wordpress.org will allow for all subdomains of wordpress.org to be contacted. 499 * 500 * @since 2.8.0 501 * @link http://core.trac.wordpress.org/ticket/8927 Allow preventing external requests. 502 * @link http://core.trac.wordpress.org/ticket/14636 Allow wildcard domains in WP_ACCESSIBLE_HOSTS 503 * 504 * @param string $uri URI of url. 505 * @return bool True to block, false to allow. 506 */ 507 function block_request($uri) { 508 // We don't need to block requests, because nothing is blocked. 509 if ( ! defined( 'WP_HTTP_BLOCK_EXTERNAL' ) || ! WP_HTTP_BLOCK_EXTERNAL ) 510 return false; 511 512 $check = parse_url($uri); 513 if ( ! $check ) 514 return true; 515 516 $home = parse_url( get_option('siteurl') ); 517 518 // Don't block requests back to ourselves by default 519 if ( $check['host'] == 'localhost' || $check['host'] == $home['host'] ) 520 return apply_filters('block_local_requests', false); 521 522 if ( !defined('WP_ACCESSIBLE_HOSTS') ) 523 return true; 524 525 static $accessible_hosts; 526 static $wildcard_regex = false; 527 if ( null == $accessible_hosts ) { 528 $accessible_hosts = preg_split('|,\s*|', WP_ACCESSIBLE_HOSTS); 529 530 if ( false !== strpos(WP_ACCESSIBLE_HOSTS, '*') ) { 531 $wildcard_regex = array(); 532 foreach ( $accessible_hosts as $host ) 533 $wildcard_regex[] = str_replace( '\*', '.+', preg_quote( $host, '/' ) ); 534 $wildcard_regex = '/^(' . implode('|', $wildcard_regex) . ')$/i'; 535 } 536 } 537 538 if ( !empty($wildcard_regex) ) 539 return !preg_match($wildcard_regex, $check['host']); 540 else 541 return !in_array( $check['host'], $accessible_hosts ); //Inverse logic, If it's in the array, then we can't access it. 542 543 } 544 545 static function make_absolute_url( $maybe_relative_path, $url ) { 546 if ( empty( $url ) ) 547 return $maybe_relative_path; 548 549 // Check for a scheme 550 if ( false !== strpos( $maybe_relative_path, '://' ) ) 551 return $maybe_relative_path; 552 553 if ( ! $url_parts = @parse_url( $url ) ) 554 return $maybe_relative_path; 555 556 if ( ! $relative_url_parts = @parse_url( $maybe_relative_path ) ) 557 return $maybe_relative_path; 558 559 $absolute_path = $url_parts['scheme'] . '://' . $url_parts['host']; 560 if ( isset( $url_parts['port'] ) ) 561 $absolute_path .= ':' . $url_parts['port']; 562 563 // Start off with the Absolute URL path 564 $path = ! empty( $url_parts['path'] ) ? $url_parts['path'] : '/'; 565 566 // If it's a root-relative path, then great 567 if ( ! empty( $relative_url_parts['path'] ) && '/' == $relative_url_parts['path'][0] ) { 568 $path = $relative_url_parts['path']; 569 570 // Else it's a relative path 571 } elseif ( ! empty( $relative_url_parts['path'] ) ) { 572 // Strip off any file components from the absolute path 573 $path = substr( $path, 0, strrpos( $path, '/' ) + 1 ); 574 575 // Build the new path 576 $path .= $relative_url_parts['path']; 577 578 // Strip all /path/../ out of the path 579 while ( strpos( $path, '../' ) > 1 ) { 580 $path = preg_replace( '![^/]+/\.\./!', '', $path ); 581 } 582 583 // Strip any final leading ../ from the path 584 $path = preg_replace( '!^/(\.\./)+!', '', $path ); 585 } 586 587 // Add the Query string 588 if ( ! empty( $relative_url_parts['query'] ) ) 589 $path .= '?' . $relative_url_parts['query']; 590 591 return $absolute_path . '/' . ltrim( $path, '/' ); 592 } 593 594 /** 595 * Handles HTTP Redirects and follows them if appropriate. 596 * 597 * @since 3.7.0 598 * 599 * @param string $url The URL which was requested. 600 * @param array $args The Arguements which were used to make the request. 601 * @param array $response The Response of the HTTP request. 602 * @return false|object False if no redirect is present, a WP_HTTP or WP_Error result otherwise. 603 */ 604 static function handle_redirects( $url, $args, $response ) { 605 // If no redirects are present, or, redirects were not requested, perform no action. 606 if ( ! isset( $response['headers']['location'] ) || 0 === $args['_redirection'] ) 607 return false; 608 609 // Only perform redirections on redirection http codes 610 if ( $response['response']['code'] > 399 || $response['response']['code'] < 300 ) 611 return false; 612 613 // Don't redirect if we've run out of redirects 614 if ( $args['redirection']-- <= 0 ) 615 return new WP_Error( 'http_request_failed', __('Too many redirects.') ); 616 617 $redirect_location = $response['headers']['location']; 618 619 // If there were multiple Location headers, use the last header specified 620 if ( is_array( $redirect_location ) ) 621 $redirect_location = array_pop( $redirect_location ); 622 623 $redirect_location = WP_HTTP::make_absolute_url( $redirect_location, $url ); 624 625 // POST requests should not POST to a redirected location 626 if ( 'POST' == $args['method'] ) { 627 if ( in_array( $response['response']['code'], array( 302, 303 ) ) ) 628 $args['method'] = 'GET'; 629 } 630 631 // Include valid cookies in the redirect process 632 if ( ! empty( $response['cookies'] ) ) { 633 foreach ( $response['cookies'] as $cookie ) { 634 if ( $cookie->test( $redirect_location ) ) 635 $args['cookies'][] = $cookie; 636 } 637 } 638 639 return wp_remote_request( $redirect_location, $args ); 640 } 641 642 /** 643 * Determines if a specified string represents an IP address or not. 644 * 645 * This function also detects the type of the IP address, returning either 646 * '4' or '6' to represent a IPv4 and IPv6 address respectively. 647 * This does not verify if the IP is a valid IP, only that it appears to be 648 * an IP address. 649 * 650 * @see http://home.deds.nl/~aeron/regex/ for IPv6 regex 651 * 652 * @since 3.7.0 653 * @static 654 * 655 * @param string $maybe_ip A suspected IP address 656 * @return integer|bool Upon success, '4' or '6' to represent a IPv4 or IPv6 address, false upon failure 657 */ 658 static function is_ip_address( $maybe_ip ) { 659 if ( preg_match( '/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $maybe_ip ) ) 660 return 4; 661 662 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, ' []' ) ) ) 663 return 6; 664 665 return false; 666 } 667 668 } 669 670 /** 671 * HTTP request method uses PHP Streams to retrieve the url. 672 * 673 * @package WordPress 674 * @subpackage HTTP 675 * 676 * @since 2.7.0 677 * @since 3.7.0 Combined with the fsockopen transport and switched to stream_socket_client(). 678 */ 679 class WP_Http_Streams { 680 /** 681 * Send a HTTP request to a URI using PHP Streams. 682 * 683 * @see WP_Http::request For default options descriptions. 684 * 685 * @since 2.7.0 686 * @since 3.7.0 Combined with the fsockopen transport and switched to stream_socket_client(). 687 * 688 * @access public 689 * @param string $url URI resource. 690 * @param string|array $args Optional. Override the defaults. 691 * @return array 'headers', 'body', 'response', 'cookies' and 'filename' keys. 692 */ 693 function request($url, $args = array()) { 694 $defaults = array( 695 'method' => 'GET', 'timeout' => 5, 696 'redirection' => 5, 'httpversion' => '1.0', 697 'blocking' => true, 698 'headers' => array(), 'body' => null, 'cookies' => array() 699 ); 700 701 $r = wp_parse_args( $args, $defaults ); 702 703 if ( isset($r['headers']['User-Agent']) ) { 704 $r['user-agent'] = $r['headers']['User-Agent']; 705 unset($r['headers']['User-Agent']); 706 } else if ( isset($r['headers']['user-agent']) ) { 707 $r['user-agent'] = $r['headers']['user-agent']; 708 unset($r['headers']['user-agent']); 709 } 710 711 // Construct Cookie: header if any cookies are set 712 WP_Http::buildCookieHeader( $r ); 713 714 $arrURL = parse_url($url); 715 716 $connect_host = $arrURL['host']; 717 718 $secure_transport = ( $arrURL['scheme'] == 'ssl' || $arrURL['scheme'] == 'https' ); 719 if ( ! isset( $arrURL['port'] ) ) { 720 if ( $arrURL['scheme'] == 'ssl' || $arrURL['scheme'] == 'https' ) { 721 $arrURL['port'] = 443; 722 $secure_transport = true; 723 } else { 724 $arrURL['port'] = 80; 725 } 726 } 727 728 if ( isset( $r['headers']['Host'] ) || isset( $r['headers']['host'] ) ) { 729 if ( isset( $r['headers']['Host'] ) ) 730 $arrURL['host'] = $r['headers']['Host']; 731 else 732 $arrURL['host'] = $r['headers']['host']; 733 unset( $r['headers']['Host'], $r['headers']['host'] ); 734 } 735 736 // Certain versions of PHP have issues with 'localhost' and IPv6, It attempts to connect to ::1, 737 // which fails when the server is not set up for it. For compatibility, always connect to the IPv4 address. 738 if ( 'localhost' == strtolower( $connect_host ) ) 739 $connect_host = '127.0.0.1'; 740 741 $connect_host = $secure_transport ? 'ssl://' . $connect_host : 'tcp://' . $connect_host; 742 743 $is_local = isset( $r['local'] ) && $r['local']; 744 $ssl_verify = isset( $r['sslverify'] ) && $r['sslverify']; 745 if ( $is_local ) 746 $ssl_verify = apply_filters( 'https_local_ssl_verify', $ssl_verify ); 747 elseif ( ! $is_local ) 748 $ssl_verify = apply_filters( 'https_ssl_verify', $ssl_verify ); 749 750 $proxy = new WP_HTTP_Proxy(); 751 752 $context = stream_context_create( array( 753 'ssl' => array( 754 'verify_peer' => $ssl_verify, 755 //'CN_match' => $arrURL['host'], // This is handled by self::verify_ssl_certificate() 756 'capture_peer_cert' => $ssl_verify, 757 'SNI_enabled' => true, 758 'cafile' => $r['sslcertificates'], 759 'allow_self_signed' => ! $ssl_verify, 760 ) 761 ) ); 762 763 $timeout = (int) floor( $r['timeout'] ); 764 $utimeout = $timeout == $r['timeout'] ? 0 : 1000000 * $r['timeout'] % 1000000; 765 $connect_timeout = max( $timeout, 1 ); 766 767 $connection_error = null; // Store error number 768 $connection_error_str = null; // Store error string 769 770 if ( !WP_DEBUG ) { 771 // In the event that the SSL connection fails, silence the many PHP Warnings 772 if ( $secure_transport ) 773 $error_reporting = error_reporting(0); 774 775 if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) 776 $handle = @stream_socket_client( 'tcp://' . $proxy->host() . ':' . $proxy->port(), $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context ); 777 else 778 $handle = @stream_socket_client( $connect_host . ':' . $arrURL['port'], $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context ); 779 780 if ( $secure_transport ) 781 error_reporting( $error_reporting ); 782 783 } else { 784 if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) 785 $handle = stream_socket_client( 'tcp://' . $proxy->host() . ':' . $proxy->port(), $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context ); 786 else 787 $handle = stream_socket_client( $connect_host . ':' . $arrURL['port'], $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context ); 788 } 789 790 if ( false === $handle ) { 791 // SSL connection failed due to expired/invalid cert, or, OpenSSL configuration is broken 792 if ( $secure_transport && 0 === $connection_error && '' === $connection_error_str ) 793 return new WP_Error( 'http_request_failed', __( 'The SSL certificate for the host could not be verified.' ) ); 794 795 return new WP_Error('http_request_failed', $connection_error . ': ' . $connection_error_str ); 796 } 797 798 // Verify that the SSL certificate is valid for this request 799 if ( $secure_transport && $ssl_verify && ! $proxy->is_enabled() ) { 800 if ( ! self::verify_ssl_certificate( $handle, $arrURL['host'] ) ) 801 return new WP_Error( 'http_request_failed', __( 'The SSL certificate for the host could not be verified.' ) ); 802 } 803 804 stream_set_timeout( $handle, $timeout, $utimeout ); 805 806 if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) //Some proxies require full URL in this field. 807 $requestPath = $url; 808 else 809 $requestPath = $arrURL['path'] . ( isset($arrURL['query']) ? '?' . $arrURL['query'] : '' ); 810 811 if ( empty($requestPath) ) 812 $requestPath .= '/'; 813 814 $strHeaders = strtoupper($r['method']) . ' ' . $requestPath . ' HTTP/' . $r['httpversion'] . "\r\n"; 815 816 if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) 817 $strHeaders .= 'Host: ' . $arrURL['host'] . ':' . $arrURL['port'] . "\r\n"; 818 else 819 $strHeaders .= 'Host: ' . $arrURL['host'] . "\r\n"; 820 821 if ( isset($r['user-agent']) ) 822 $strHeaders .= 'User-agent: ' . $r['user-agent'] . "\r\n"; 823 824 if ( is_array($r['headers']) ) { 825 foreach ( (array) $r['headers'] as $header => $headerValue ) 826 $strHeaders .= $header . ': ' . $headerValue . "\r\n"; 827 } else { 828 $strHeaders .= $r['headers']; 829 } 830 831 if ( $proxy->use_authentication() ) 832 $strHeaders .= $proxy->authentication_header() . "\r\n"; 833 834 $strHeaders .= "\r\n"; 835 836 if ( ! is_null($r['body']) ) 837 $strHeaders .= $r['body']; 838 839 fwrite($handle, $strHeaders); 840 841 if ( ! $r['blocking'] ) { 842 stream_set_blocking( $handle, 0 ); 843 fclose( $handle ); 844 return array( 'headers' => array(), 'body' => '', 'response' => array('code' => false, 'message' => false), 'cookies' => array() ); 845 } 846 847 $strResponse = ''; 848 $bodyStarted = false; 849 $keep_reading = true; 850 $block_size = 4096; 851 if ( isset( $r['limit_response_size'] ) ) 852 $block_size = min( $block_size, $r['limit_response_size'] ); 853 854 // If streaming to a file setup the file handle 855 if ( $r['stream'] ) { 856 if ( ! WP_DEBUG ) 857 $stream_handle = @fopen( $r['filename'], 'w+' ); 858 else 859 $stream_handle = fopen( $r['filename'], 'w+' ); 860 if ( ! $stream_handle ) 861 return new WP_Error( 'http_request_failed', sprintf( __( 'Could not open handle for fopen() to %s' ), $r['filename'] ) ); 862 863 $bytes_written = 0; 864 while ( ! feof($handle) && $keep_reading ) { 865 $block = fread( $handle, $block_size ); 866 if ( ! $bodyStarted ) { 867 $strResponse .= $block; 868 if ( strpos( $strResponse, "\r\n\r\n" ) ) { 869 $process = WP_Http::processResponse( $strResponse ); 870 $bodyStarted = true; 871 $block = $process['body']; 872 unset( $strResponse ); 873 $process['body'] = ''; 874 } 875 } 876 877 $this_block_size = strlen( $block ); 878 879 if ( isset( $r['limit_response_size'] ) && ( $bytes_written + $this_block_size ) > $r['limit_response_size'] ) 880 $block = substr( $block, 0, ( $r['limit_response_size'] - $bytes_written ) ); 881 882 $bytes_written_to_file = fwrite( $stream_handle, $block ); 883 884 if ( $bytes_written_to_file != $this_block_size ) { 885 fclose( $handle ); 886 fclose( $stream_handle ); 887 return new WP_Error( 'http_request_failed', __( 'Failed to write request to temporary file.' ) ); 888 } 889 890 $bytes_written += $bytes_written_to_file; 891 892 $keep_reading = !isset( $r['limit_response_size'] ) || $bytes_written < $r['limit_response_size']; 893 } 894 895 fclose( $stream_handle ); 896 897 } else { 898 $header_length = 0; 899 while ( ! feof( $handle ) && $keep_reading ) { 900 $block = fread( $handle, $block_size ); 901 $strResponse .= $block; 902 if ( ! $bodyStarted && strpos( $strResponse, "\r\n\r\n" ) ) { 903 $header_length = strpos( $strResponse, "\r\n\r\n" ) + 4; 904 $bodyStarted = true; 905 } 906 $keep_reading = ( ! $bodyStarted || !isset( $r['limit_response_size'] ) || strlen( $strResponse ) < ( $header_length + $r['limit_response_size'] ) ); 907 } 908 909 $process = WP_Http::processResponse( $strResponse ); 910 unset( $strResponse ); 911 912 } 913 914 fclose( $handle ); 915 916 $arrHeaders = WP_Http::processHeaders( $process['headers'], $url ); 917 918 $response = array( 919 'headers' => $arrHeaders['headers'], 920 'body' => null, // Not yet processed 921 'response' => $arrHeaders['response'], 922 'cookies' => $arrHeaders['cookies'], 923 'filename' => $r['filename'] 924 ); 925 926 // Handle redirects 927 if ( false !== ( $redirect_response = WP_HTTP::handle_redirects( $url, $r, $response ) ) ) 928 return $redirect_response; 929 930 // If the body was chunk encoded, then decode it. 931 if ( ! empty( $process['body'] ) && isset( $arrHeaders['headers']['transfer-encoding'] ) && 'chunked' == $arrHeaders['headers']['transfer-encoding'] ) 932 $process['body'] = WP_Http::chunkTransferDecode($process['body']); 933 934 if ( true === $r['decompress'] && true === WP_Http_Encoding::should_decode($arrHeaders['headers']) ) 935 $process['body'] = WP_Http_Encoding::decompress( $process['body'] ); 936 937 if ( isset( $r['limit_response_size'] ) && strlen( $process['body'] ) > $r['limit_response_size'] ) 938 $process['body'] = substr( $process['body'], 0, $r['limit_response_size'] ); 939 940 $response['body'] = $process['body']; 941 942 return $response; 943 } 944 945 /** 946 * Verifies the received SSL certificate against it's Common Names and subjectAltName fields 947 * 948 * PHP's SSL verifications only verify that it's a valid Certificate, it doesn't verify if 949 * the certificate is valid for the hostname which was requested. 950 * This function verifies the requested hostname against certificate's subjectAltName field, 951 * if that is empty, or contains no DNS entries, a fallback to the Common Name field is used. 952 * 953 * IP Address support is included if the request is being made to an IP address. 954 * 955 * @since 3.7.0 956 * @static 957 * 958 * @param stream $stream The PHP Stream which the SSL request is being made over 959 * @param string $host The hostname being requested 960 * @return bool If the cerficiate presented in $stream is valid for $host 961 */ 962 static function verify_ssl_certificate( $stream, $host ) { 963 $context_options = stream_context_get_options( $stream ); 964 965 if ( empty( $context_options['ssl']['peer_certificate'] ) ) 966 return false; 967 968 $cert = openssl_x509_parse( $context_options['ssl']['peer_certificate'] ); 969 if ( ! $cert ) 970 return false; 971 972 // If the request is being made to an IP address, we'll validate against IP fields in the cert (if they exist) 973 $host_type = ( WP_HTTP::is_ip_address( $host ) ? 'ip' : 'dns' ); 974 975 $certificate_hostnames = array(); 976 if ( ! empty( $cert['extensions']['subjectAltName'] ) ) { 977 $match_against = preg_split( '/,\s*/', $cert['extensions']['subjectAltName'] ); 978 foreach ( $match_against as $match ) { 979 list( $match_type, $match_host ) = explode( ':', $match ); 980 if ( $host_type == strtolower( trim( $match_type ) ) ) // IP: or DNS: 981 $certificate_hostnames[] = strtolower( trim( $match_host ) ); 982 } 983 } elseif ( !empty( $cert['subject']['CN'] ) ) { 984 // Only use the CN when the certificate includes no subjectAltName extension 985 $certificate_hostnames[] = strtolower( $cert['subject']['CN'] ); 986 } 987 988 // Exact hostname/IP matches 989 if ( in_array( strtolower( $host ), $certificate_hostnames ) ) 990 return true; 991 992 // IP's can't be wildcards, Stop processing 993 if ( 'ip' == $host_type ) 994 return false; 995 996 // Test to see if the domain is at least 2 deep for wildcard support 997 if ( substr_count( $host, '.' ) < 2 ) 998 return false; 999 1000 // Wildcard subdomains certs (*.example.com) are valid for a.example.com but not a.b.example.com 1001 $wildcard_host = preg_replace( '/^[^.]+\./', '*.', $host ); 1002 1003 return in_array( strtolower( $wildcard_host ), $certificate_hostnames ); 1004 } 1005 1006 /** 1007 * Whether this class can be used for retrieving an URL. 1008 * 1009 * @static 1010 * @access public 1011 * @since 2.7.0 1012 * @since 3.7.0 Combined with the fsockopen transport and switched to stream_socket_client(). 1013 * 1014 * @return boolean False means this class can not be used, true means it can. 1015 */ 1016 public static function test( $args = array() ) { 1017 if ( ! function_exists( 'stream_socket_client' ) ) 1018 return false; 1019 1020 $is_ssl = isset( $args['ssl'] ) && $args['ssl']; 1021 1022 if ( $is_ssl ) { 1023 if ( ! extension_loaded( 'openssl' ) ) 1024 return false; 1025 if ( ! function_exists( 'openssl_x509_parse' ) ) 1026 return false; 1027 } 1028 1029 return apply_filters( 'use_streams_transport', true, $args ); 1030 } 1031 } 1032 1033 /** 1034 * Deprecated HTTP Transport method which used fsockopen. 1035 * 1036 * This class is not used, and is included for backwards compatibility only. 1037 * All code should make use of WP_HTTP directly through it's API. 1038 * 1039 * @see WP_HTTP::request 1040 * 1041 * @package WordPress 1042 * @subpackage HTTP 1043 * 1044 * @since 2.7.0 1045 * @deprecated 3.7.0 Please use WP_HTTP::request() directly 1046 */ 1047 class WP_HTTP_Fsockopen extends WP_HTTP_Streams { 1048 // For backwards compatibility for users who are using the class directly 1049 } 1050 1051 /** 1052 * HTTP request method uses Curl extension to retrieve the url. 1053 * 1054 * Requires the Curl extension to be installed. 1055 * 1056 * @package WordPress 1057 * @subpackage HTTP 1058 * @since 2.7.0 1059 */ 1060 class WP_Http_Curl { 1061 1062 /** 1063 * Temporary header storage for during requests. 1064 * 1065 * @since 3.2.0 1066 * @access private 1067 * @var string 1068 */ 1069 private $headers = ''; 1070 1071 /** 1072 * Temporary body storage for during requests. 1073 * 1074 * @since 3.6.0 1075 * @access private 1076 * @var string 1077 */ 1078 private $body = ''; 1079 1080 /** 1081 * The maximum amount of data to recieve from the remote server 1082 * 1083 * @since 3.6.0 1084 * @access private 1085 * @var int 1086 */ 1087 private $max_body_length = false; 1088 1089 /** 1090 * The file resource used for streaming to file. 1091 * 1092 * @since 3.6.0 1093 * @access private 1094 * @var resource 1095 */ 1096 private $stream_handle = false; 1097 1098 /** 1099 * Send a HTTP request to a URI using cURL extension. 1100 * 1101 * @access public 1102 * @since 2.7.0 1103 * 1104 * @param string $url 1105 * @param str|array $args Optional. Override the defaults. 1106 * @return array 'headers', 'body', 'response', 'cookies' and 'filename' keys. 1107 */ 1108 function request($url, $args = array()) { 1109 $defaults = array( 1110 'method' => 'GET', 'timeout' => 5, 1111 'redirection' => 5, 'httpversion' => '1.0', 1112 'blocking' => true, 1113 'headers' => array(), 'body' => null, 'cookies' => array() 1114 ); 1115 1116 $r = wp_parse_args( $args, $defaults ); 1117 1118 if ( isset($r['headers']['User-Agent']) ) { 1119 $r['user-agent'] = $r['headers']['User-Agent']; 1120 unset($r['headers']['User-Agent']); 1121 } else if ( isset($r['headers']['user-agent']) ) { 1122 $r['user-agent'] = $r['headers']['user-agent']; 1123 unset($r['headers']['user-agent']); 1124 } 1125 1126 // Construct Cookie: header if any cookies are set. 1127 WP_Http::buildCookieHeader( $r ); 1128 1129 $handle = curl_init(); 1130 1131 // cURL offers really easy proxy support. 1132 $proxy = new WP_HTTP_Proxy(); 1133 1134 if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) { 1135 1136 curl_setopt( $handle, CURLOPT_PROXYTYPE, CURLPROXY_HTTP ); 1137 curl_setopt( $handle, CURLOPT_PROXY, $proxy->host() ); 1138 curl_setopt( $handle, CURLOPT_PROXYPORT, $proxy->port() ); 1139 1140 if ( $proxy->use_authentication() ) { 1141 curl_setopt( $handle, CURLOPT_PROXYAUTH, CURLAUTH_ANY ); 1142 curl_setopt( $handle, CURLOPT_PROXYUSERPWD, $proxy->authentication() ); 1143 } 1144 } 1145 1146 $is_local = isset($r['local']) && $r['local']; 1147 $ssl_verify = isset($r['sslverify']) && $r['sslverify']; 1148 if ( $is_local ) 1149 $ssl_verify = apply_filters('https_local_ssl_verify', $ssl_verify); 1150 elseif ( ! $is_local ) 1151 $ssl_verify = apply_filters('https_ssl_verify', $ssl_verify); 1152 1153 // CURLOPT_TIMEOUT and CURLOPT_CONNECTTIMEOUT expect integers. Have to use ceil since 1154 // a value of 0 will allow an unlimited timeout. 1155 $timeout = (int) ceil( $r['timeout'] ); 1156 curl_setopt( $handle, CURLOPT_CONNECTTIMEOUT, $timeout ); 1157 curl_setopt( $handle, CURLOPT_TIMEOUT, $timeout ); 1158 1159 curl_setopt( $handle, CURLOPT_URL, $url); 1160 curl_setopt( $handle, CURLOPT_RETURNTRANSFER, true ); 1161 curl_setopt( $handle, CURLOPT_SSL_VERIFYHOST, ( $ssl_verify === true ) ? 2 : false ); 1162 curl_setopt( $handle, CURLOPT_SSL_VERIFYPEER, $ssl_verify ); 1163 curl_setopt( $handle, CURLOPT_CAINFO, $r['sslcertificates'] ); 1164 curl_setopt( $handle, CURLOPT_USERAGENT, $r['user-agent'] ); 1165 // The option doesn't work with safe mode or when open_basedir is set, and there's a 1166 // bug #17490 with redirected POST requests, so handle redirections outside Curl. 1167 curl_setopt( $handle, CURLOPT_FOLLOWLOCATION, false ); 1168 if ( defined( 'CURLOPT_PROTOCOLS' ) ) // PHP 5.2.10 / cURL 7.19.4 1169 curl_setopt( $handle, CURLOPT_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS ); 1170 1171 switch ( $r['method'] ) { 1172 case 'HEAD': 1173 curl_setopt( $handle, CURLOPT_NOBODY, true ); 1174 break; 1175 case 'POST': 1176 curl_setopt( $handle, CURLOPT_POST, true ); 1177 curl_setopt( $handle, CURLOPT_POSTFIELDS, $r['body'] ); 1178 break; 1179 case 'PUT': 1180 curl_setopt( $handle, CURLOPT_CUSTOMREQUEST, 'PUT' ); 1181 curl_setopt( $handle, CURLOPT_POSTFIELDS, $r['body'] ); 1182 break; 1183 default: 1184 curl_setopt( $handle, CURLOPT_CUSTOMREQUEST, $r['method'] ); 1185 if ( ! is_null( $r['body'] ) ) 1186 curl_setopt( $handle, CURLOPT_POSTFIELDS, $r['body'] ); 1187 break; 1188 } 1189 1190 if ( true === $r['blocking'] ) { 1191 curl_setopt( $handle, CURLOPT_HEADERFUNCTION, array( $this, 'stream_headers' ) ); 1192 curl_setopt( $handle, CURLOPT_WRITEFUNCTION, array( $this, 'stream_body' ) ); 1193 } 1194 1195 curl_setopt( $handle, CURLOPT_HEADER, false ); 1196 1197 if ( isset( $r['limit_response_size'] ) ) 1198 $this->max_body_length = intval( $r['limit_response_size'] ); 1199 else 1200 $this->max_body_length = false; 1201 1202 // If streaming to a file open a file handle, and setup our curl streaming handler 1203 if ( $r['stream'] ) { 1204 if ( ! WP_DEBUG ) 1205 $this->stream_handle = @fopen( $r['filename'], 'w+' ); 1206 else 1207 $this->stream_handle = fopen( $r['filename'], 'w+' ); 1208 if ( ! $this->stream_handle ) 1209 return new WP_Error( 'http_request_failed', sprintf( __( 'Could not open handle for fopen() to %s' ), $r['filename'] ) ); 1210 } else { 1211 $this->stream_handle = false; 1212 } 1213 1214 if ( !empty( $r['headers'] ) ) { 1215 // cURL expects full header strings in each element 1216 $headers = array(); 1217 foreach ( $r['headers'] as $name => $value ) { 1218 $headers[] = "{$name}: $value"; 1219 } 1220 curl_setopt( $handle, CURLOPT_HTTPHEADER, $headers ); 1221 } 1222 1223 if ( $r['httpversion'] == '1.0' ) 1224 curl_setopt( $handle, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0 ); 1225 else 1226 curl_setopt( $handle, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1 ); 1227 1228 // Cookies are not handled by the HTTP API currently. Allow for plugin authors to handle it 1229 // themselves... Although, it is somewhat pointless without some reference. 1230 do_action_ref_array( 'http_api_curl', array(&$handle) ); 1231 1232 // We don't need to return the body, so don't. Just execute request and return. 1233 if ( ! $r['blocking'] ) { 1234 curl_exec( $handle ); 1235 1236 if ( $curl_error = curl_error( $handle ) ) { 1237 curl_close( $handle ); 1238 return new WP_Error( 'http_request_failed', $curl_error ); 1239 } 1240 if ( in_array( curl_getinfo( $handle, CURLINFO_HTTP_CODE ), array( 301, 302 ) ) ) { 1241 curl_close( $handle ); 1242 return new WP_Error( 'http_request_failed', __( 'Too many redirects.' ) ); 1243 } 1244 1245 curl_close( $handle ); 1246 return array( 'headers' => array(), 'body' => '', 'response' => array('code' => false, 'message' => false), 'cookies' => array() ); 1247 } 1248 1249 $theResponse = curl_exec( $handle ); 1250 $theHeaders = WP_Http::processHeaders( $this->headers, $url ); 1251 $theBody = $this->body; 1252 1253 $this->headers = ''; 1254 $this->body = ''; 1255 1256 $curl_error = curl_errno( $handle ); 1257 1258 // If an error occured, or, no response 1259 if ( $curl_error || ( 0 == strlen( $theBody ) && empty( $theHeaders['headers'] ) ) ) { 1260 if ( CURLE_WRITE_ERROR /* 23 */ == $curl_error && $r['stream'] ) { 1261 fclose( $this->stream_handle ); 1262 return new WP_Error( 'http_request_failed', __( 'Failed to write request to temporary file.' ) ); 1263 } 1264 if ( $curl_error = curl_error( $handle ) ) { 1265 curl_close( $handle ); 1266 return new WP_Error( 'http_request_failed', $curl_error ); 1267 } 1268 if ( in_array( curl_getinfo( $handle, CURLINFO_HTTP_CODE ), array( 301, 302 ) ) ) { 1269 curl_close( $handle ); 1270 return new WP_Error( 'http_request_failed', __( 'Too many redirects.' ) ); 1271 } 1272 } 1273 1274 $response = array(); 1275 $response['code'] = curl_getinfo( $handle, CURLINFO_HTTP_CODE ); 1276 $response['message'] = get_status_header_desc($response['code']); 1277 1278 curl_close( $handle ); 1279 1280 if ( $r['stream'] ) 1281 fclose( $this->stream_handle ); 1282 1283 $response = array( 1284 'headers' => $theHeaders['headers'], 1285 'body' => null, 1286 'response' => $response, 1287 'cookies' => $theHeaders['cookies'], 1288 'filename' => $r['filename'] 1289 ); 1290 1291 // Handle redirects 1292 if ( false !== ( $redirect_response = WP_HTTP::handle_redirects( $url, $r, $response ) ) ) 1293 return $redirect_response; 1294 1295 if ( true === $r['decompress'] && true === WP_Http_Encoding::should_decode($theHeaders['headers']) ) 1296 $theBody = WP_Http_Encoding::decompress( $theBody ); 1297 1298 $response['body'] = $theBody; 1299 1300 return $response; 1301 } 1302 1303 /** 1304 * Grab the headers of the cURL request 1305 * 1306 * Each header is sent individually to this callback, so we append to the $header property for temporary storage 1307 * 1308 * @since 3.2.0 1309 * @access private 1310 * @return int 1311 */ 1312 private function stream_headers( $handle, $headers ) { 1313 $this->headers .= $headers; 1314 return strlen( $headers ); 1315 } 1316 1317 /** 1318 * Grab the body of the cURL request 1319 * 1320 * The contents of the document are passed in chunks, so we append to the $body property for temporary storage. 1321 * Returning a length shorter than the length of $data passed in will cause cURL to abort the request as "completed" 1322 * 1323 * @since 3.6.0 1324 * @access private 1325 * @return int 1326 */ 1327 private function stream_body( $handle, $data ) { 1328 $data_length = strlen( $data ); 1329 1330 if ( $this->max_body_length && ( strlen( $this->body ) + $data_length ) > $this->max_body_length ) 1331 $data = substr( $data, 0, ( $this->max_body_length - $data_length ) ); 1332 1333 if ( $this->stream_handle ) { 1334 $bytes_written = fwrite( $this->stream_handle, $data ); 1335 } else { 1336 $this->body .= $data; 1337 $bytes_written = $data_length; 1338 } 1339 1340 // Upon event of this function returning less than strlen( $data ) curl will error with CURLE_WRITE_ERROR 1341 return $bytes_written; 1342 } 1343 1344 /** 1345 * Whether this class can be used for retrieving an URL. 1346 * 1347 * @static 1348 * @since 2.7.0 1349 * 1350 * @return boolean False means this class can not be used, true means it can. 1351 */ 1352 public static function test( $args = array() ) { 1353 if ( ! function_exists( 'curl_init' ) || ! function_exists( 'curl_exec' ) ) 1354 return false; 1355 1356 $is_ssl = isset( $args['ssl'] ) && $args['ssl']; 1357 1358 if ( $is_ssl ) { 1359 $curl_version = curl_version(); 1360 if ( ! (CURL_VERSION_SSL & $curl_version['features']) ) // Does this cURL version support SSL requests? 1361 return false; 1362 } 1363 1364 return apply_filters( 'use_curl_transport', true, $args ); 1365 } 1366 } 1367 1368 /** 1369 * Adds Proxy support to the WordPress HTTP API. 1370 * 1371 * There are caveats to proxy support. It requires that defines be made in the wp-config.php file to 1372 * enable proxy support. There are also a few filters that plugins can hook into for some of the 1373 * constants. 1374 * 1375 * Please note that only BASIC authentication is supported by most transports. 1376 * cURL MAY support more methods (such as NTLM authentication) depending on your environment. 1377 * 1378 * The constants are as follows: 1379 * <ol> 1380 * <li>WP_PROXY_HOST - Enable proxy support and host for connecting.</li> 1381 * <li>WP_PROXY_PORT - Proxy port for connection. No default, must be defined.</li> 1382 * <li>WP_PROXY_USERNAME - Proxy username, if it requires authentication.</li> 1383 * <li>WP_PROXY_PASSWORD - Proxy password, if it requires authentication.</li> 1384 * <li>WP_PROXY_BYPASS_HOSTS - Will prevent the hosts in this list from going through the proxy. 1385 * You do not need to have localhost and the blog host in this list, because they will not be passed 1386 * through the proxy. The list should be presented in a comma separated list, wildcards using * are supported, eg. *.wordpress.org</li> 1387 * </ol> 1388 * 1389 * An example can be as seen below. 1390 * <code> 1391 * define('WP_PROXY_HOST', '192.168.84.101'); 1392 * define('WP_PROXY_PORT', '8080'); 1393 * define('WP_PROXY_BYPASS_HOSTS', 'localhost, www.example.com, *.wordpress.org'); 1394 * </code> 1395 * 1396 * @link http://core.trac.wordpress.org/ticket/4011 Proxy support ticket in WordPress. 1397 * @link http://core.trac.wordpress.org/ticket/14636 Allow wildcard domains in WP_PROXY_BYPASS_HOSTS 1398 * @since 2.8 1399 */ 1400 class WP_HTTP_Proxy { 1401 1402 /** 1403 * Whether proxy connection should be used. 1404 * 1405 * @since 2.8 1406 * @use WP_PROXY_HOST 1407 * @use WP_PROXY_PORT 1408 * 1409 * @return bool 1410 */ 1411 function is_enabled() { 1412 return defined('WP_PROXY_HOST') && defined('WP_PROXY_PORT'); 1413 } 1414 1415 /** 1416 * Whether authentication should be used. 1417 * 1418 * @since 2.8 1419 * @use WP_PROXY_USERNAME 1420 * @use WP_PROXY_PASSWORD 1421 * 1422 * @return bool 1423 */ 1424 function use_authentication() { 1425 return defined('WP_PROXY_USERNAME') && defined('WP_PROXY_PASSWORD'); 1426 } 1427 1428 /** 1429 * Retrieve the host for the proxy server. 1430 * 1431 * @since 2.8 1432 * 1433 * @return string 1434 */ 1435 function host() { 1436 if ( defined('WP_PROXY_HOST') ) 1437 return WP_PROXY_HOST; 1438 1439 return ''; 1440 } 1441 1442 /** 1443 * Retrieve the port for the proxy server. 1444 * 1445 * @since 2.8 1446 * 1447 * @return string 1448 */ 1449 function port() { 1450 if ( defined('WP_PROXY_PORT') ) 1451 return WP_PROXY_PORT; 1452 1453 return ''; 1454 } 1455 1456 /** 1457 * Retrieve the username for proxy authentication. 1458 * 1459 * @since 2.8 1460 * 1461 * @return string 1462 */ 1463 function username() { 1464 if ( defined('WP_PROXY_USERNAME') ) 1465 return WP_PROXY_USERNAME; 1466 1467 return ''; 1468 } 1469 1470 /** 1471 * Retrieve the password for proxy authentication. 1472 * 1473 * @since 2.8 1474 * 1475 * @return string 1476 */ 1477 function password() { 1478 if ( defined('WP_PROXY_PASSWORD') ) 1479 return WP_PROXY_PASSWORD; 1480 1481 return ''; 1482 } 1483 1484 /** 1485 * Retrieve authentication string for proxy authentication. 1486 * 1487 * @since 2.8 1488 * 1489 * @return string 1490 */ 1491 function authentication() { 1492 return $this->username() . ':' . $this->password(); 1493 } 1494 1495 /** 1496 * Retrieve header string for proxy authentication. 1497 * 1498 * @since 2.8 1499 * 1500 * @return string 1501 */ 1502 function authentication_header() { 1503 return 'Proxy-Authorization: Basic ' . base64_encode( $this->authentication() ); 1504 } 1505 1506 /** 1507 * Whether URL should be sent through the proxy server. 1508 * 1509 * We want to keep localhost and the blog URL from being sent through the proxy server, because 1510 * some proxies can not handle this. We also have the constant available for defining other 1511 * hosts that won't be sent through the proxy. 1512 * 1513 * @uses WP_PROXY_BYPASS_HOSTS 1514 * @since 2.8.0 1515 * 1516 * @param string $uri URI to check. 1517 * @return bool True, to send through the proxy and false if, the proxy should not be used. 1518 */ 1519 function send_through_proxy( $uri ) { 1520 // parse_url() only handles http, https type URLs, and will emit E_WARNING on failure. 1521 // This will be displayed on blogs, which is not reasonable. 1522 $check = @parse_url($uri); 1523 1524 // Malformed URL, can not process, but this could mean ssl, so let through anyway. 1525 if ( $check === false ) 1526 return true; 1527 1528 $home = parse_url( get_option('siteurl') ); 1529 1530 $result = apply_filters( 'pre_http_send_through_proxy', null, $uri, $check, $home ); 1531 if ( ! is_null( $result ) ) 1532 return $result; 1533 1534 if ( $check['host'] == 'localhost' || $check['host'] == $home['host'] ) 1535 return false; 1536 1537 if ( !defined('WP_PROXY_BYPASS_HOSTS') ) 1538 return true; 1539 1540 static $bypass_hosts; 1541 static $wildcard_regex = false; 1542 if ( null == $bypass_hosts ) { 1543 $bypass_hosts = preg_split('|,\s*|', WP_PROXY_BYPASS_HOSTS); 1544 1545 if ( false !== strpos(WP_PROXY_BYPASS_HOSTS, '*') ) { 1546 $wildcard_regex = array(); 1547 foreach ( $bypass_hosts as $host ) 1548 $wildcard_regex[] = str_replace( '\*', '.+', preg_quote( $host, '/' ) ); 1549 $wildcard_regex = '/^(' . implode('|', $wildcard_regex) . ')$/i'; 1550 } 1551 } 1552 1553 if ( !empty($wildcard_regex) ) 1554 return !preg_match($wildcard_regex, $check['host']); 1555 else 1556 return !in_array( $check['host'], $bypass_hosts ); 1557 } 1558 } 1559 /** 1560 * Internal representation of a single cookie. 1561 * 1562 * Returned cookies are represented using this class, and when cookies are set, if they are not 1563 * already a WP_Http_Cookie() object, then they are turned into one. 1564 * 1565 * @todo The WordPress convention is to use underscores instead of camelCase for function and method 1566 * names. Need to switch to use underscores instead for the methods. 1567 * 1568 * @package WordPress 1569 * @subpackage HTTP 1570 * @since 2.8.0 1571 */ 1572 class WP_Http_Cookie { 1573 1574 /** 1575 * Cookie name. 1576 * 1577 * @since 2.8.0 1578 * @var string 1579 */ 1580 var $name; 1581 1582 /** 1583 * Cookie value. 1584 * 1585 * @since 2.8.0 1586 * @var string 1587 */ 1588 var $value; 1589 1590 /** 1591 * When the cookie expires. 1592 * 1593 * @since 2.8.0 1594 * @var string 1595 */ 1596 var $expires; 1597 1598 /** 1599 * Cookie URL path. 1600 * 1601 * @since 2.8.0 1602 * @var string 1603 */ 1604 var $path; 1605 1606 /** 1607 * Cookie Domain. 1608 * 1609 * @since 2.8.0 1610 * @var string 1611 */ 1612 var $domain; 1613 1614 /** 1615 * Sets up this cookie object. 1616 * 1617 * The parameter $data should be either an associative array containing the indices names below 1618 * or a header string detailing it. 1619 * 1620 * If it's an array, it should include the following elements: 1621 * <ol> 1622 * <li>Name</li> 1623 * <li>Value - should NOT be urlencoded already.</li> 1624 * <li>Expires - (optional) String or int (UNIX timestamp).</li> 1625 * <li>Path (optional)</li> 1626 * <li>Domain (optional)</li> 1627 * <li>Port (optional)</li> 1628 * </ol> 1629 * 1630 * @access public 1631 * @since 2.8.0 1632 * 1633 * @param string|array $data Raw cookie data. 1634 * @param string $requested_url The URL which the cookie was set on, used for default 'domain' and 'port' values 1635 */ 1636 function __construct( $data, $requested_url = '' ) { 1637 if ( $requested_url ) 1638 $arrURL = @parse_url( $requested_url ); 1639 if ( isset( $arrURL['host'] ) ) 1640 $this->domain = $arrURL['host']; 1641 $this->path = isset( $arrURL['path'] ) ? $arrURL['path'] : '/'; 1642 if ( '/' != substr( $this->path, -1 ) ) 1643 $this->path = dirname( $this->path ) . '/'; 1644 1645 if ( is_string( $data ) ) { 1646 // Assume it's a header string direct from a previous request 1647 $pairs = explode( ';', $data ); 1648 1649 // Special handling for first pair; name=value. Also be careful of "=" in value 1650 $name = trim( substr( $pairs[0], 0, strpos( $pairs[0], '=' ) ) ); 1651 $value = substr( $pairs[0], strpos( $pairs[0], '=' ) + 1 ); 1652 $this->name = $name; 1653 $this->value = urldecode( $value ); 1654 array_shift( $pairs ); //Removes name=value from items. 1655 1656 // Set everything else as a property 1657 foreach ( $pairs as $pair ) { 1658 $pair = rtrim($pair); 1659 if ( empty($pair) ) //Handles the cookie ending in ; which results in a empty final pair 1660 continue; 1661 1662 list( $key, $val ) = strpos( $pair, '=' ) ? explode( '=', $pair ) : array( $pair, '' ); 1663 $key = strtolower( trim( $key ) ); 1664 if ( 'expires' == $key ) 1665 $val = strtotime( $val ); 1666 $this->$key = $val; 1667 } 1668 } else { 1669 if ( !isset( $data['name'] ) ) 1670 return false; 1671 1672 // Set properties based directly on parameters 1673 foreach ( array( 'name', 'value', 'path', 'domain', 'port' ) as $field ) { 1674 if ( isset( $data[ $field ] ) ) 1675 $this->$field = $data[ $field ]; 1676 } 1677 1678 if ( isset( $data['expires'] ) ) 1679 $this->expires = is_int( $data['expires'] ) ? $data['expires'] : strtotime( $data['expires'] ); 1680 else 1681 $this->expires = null; 1682 } 1683 } 1684 1685 /** 1686 * Confirms that it's OK to send this cookie to the URL checked against. 1687 * 1688 * Decision is based on RFC 2109/2965, so look there for details on validity. 1689 * 1690 * @access public 1691 * @since 2.8.0 1692 * 1693 * @param string $url URL you intend to send this cookie to 1694 * @return boolean true if allowed, false otherwise. 1695 */ 1696 function test( $url ) { 1697 if ( is_null( $this->name ) ) 1698 return false; 1699 1700 // Expires - if expired then nothing else matters 1701 if ( isset( $this->expires ) && time() > $this->expires ) 1702 return false; 1703 1704 // Get details on the URL we're thinking about sending to 1705 $url = parse_url( $url ); 1706 $url['port'] = isset( $url['port'] ) ? $url['port'] : ( 'https' == $url['scheme'] ? 443 : 80 ); 1707 $url['path'] = isset( $url['path'] ) ? $url['path'] : '/'; 1708 1709 // Values to use for comparison against the URL 1710 $path = isset( $this->path ) ? $this->path : '/'; 1711 $port = isset( $this->port ) ? $this->port : null; 1712 $domain = isset( $this->domain ) ? strtolower( $this->domain ) : strtolower( $url['host'] ); 1713 if ( false === stripos( $domain, '.' ) ) 1714 $domain .= '.local'; 1715 1716 // Host - very basic check that the request URL ends with the domain restriction (minus leading dot) 1717 $domain = substr( $domain, 0, 1 ) == '.' ? substr( $domain, 1 ) : $domain; 1718 if ( substr( $url['host'], -strlen( $domain ) ) != $domain ) 1719 return false; 1720 1721 // Port - supports "port-lists" in the format: "80,8000,8080" 1722 if ( !empty( $port ) && !in_array( $url['port'], explode( ',', $port) ) ) 1723 return false; 1724 1725 // Path - request path must start with path restriction 1726 if ( substr( $url['path'], 0, strlen( $path ) ) != $path ) 1727 return false; 1728 1729 return true; 1730 } 1731 1732 /** 1733 * Convert cookie name and value back to header string. 1734 * 1735 * @access public 1736 * @since 2.8.0 1737 * 1738 * @return string Header encoded cookie name and value. 1739 */ 1740 function getHeaderValue() { 1741 if ( ! isset( $this->name ) || ! isset( $this->value ) ) 1742 return ''; 1743 1744 return $this->name . '=' . apply_filters( 'wp_http_cookie_value', $this->value, $this->name ); 1745 } 1746 1747 /** 1748 * Retrieve cookie header for usage in the rest of the WordPress HTTP API. 1749 * 1750 * @access public 1751 * @since 2.8.0 1752 * 1753 * @return string 1754 */ 1755 function getFullHeader() { 1756 return 'Cookie: ' . $this->getHeaderValue(); 1757 } 1758 } 1759 1760 /** 1761 * Implementation for deflate and gzip transfer encodings. 1762 * 1763 * Includes RFC 1950, RFC 1951, and RFC 1952. 1764 * 1765 * @since 2.8 1766 * @package WordPress 1767 * @subpackage HTTP 1768 */ 1769 class WP_Http_Encoding { 1770 1771 /** 1772 * Compress raw string using the deflate format. 1773 * 1774 * Supports the RFC 1951 standard. 1775 * 1776 * @since 2.8 1777 * 1778 * @param string $raw String to compress. 1779 * @param int $level Optional, default is 9. Compression level, 9 is highest. 1780 * @param string $supports Optional, not used. When implemented it will choose the right compression based on what the server supports. 1781 * @return string|bool False on failure. 1782 */ 1783 public static function compress( $raw, $level = 9, $supports = null ) { 1784 return gzdeflate( $raw, $level ); 1785 } 1786 1787 /** 1788 * Decompression of deflated string. 1789 * 1790 * Will attempt to decompress using the RFC 1950 standard, and if that fails 1791 * then the RFC 1951 standard deflate will be attempted. Finally, the RFC 1792 * 1952 standard gzip decode will be attempted. If all fail, then the 1793 * original compressed string will be returned. 1794 * 1795 * @since 2.8 1796 * 1797 * @param string $compressed String to decompress. 1798 * @param int $length The optional length of the compressed data. 1799 * @return string|bool False on failure. 1800 */ 1801 public static function decompress( $compressed, $length = null ) { 1802 1803 if ( empty($compressed) ) 1804 return $compressed; 1805 1806 if ( false !== ( $decompressed = @gzinflate( $compressed ) ) ) 1807 return $decompressed; 1808 1809 if ( false !== ( $decompressed = WP_Http_Encoding::compatible_gzinflate( $compressed ) ) ) 1810 return $decompressed; 1811 1812 if ( false !== ( $decompressed = @gzuncompress( $compressed ) ) ) 1813 return $decompressed; 1814 1815 if ( function_exists('gzdecode') ) { 1816 $decompressed = @gzdecode( $compressed ); 1817 1818 if ( false !== $decompressed ) 1819 return $decompressed; 1820 } 1821 1822 return $compressed; 1823 } 1824 1825 /** 1826 * Decompression of deflated string while staying compatible with the majority of servers. 1827 * 1828 * Certain Servers will return deflated data with headers which PHP's gzinflate() 1829 * function cannot handle out of the box. The following function has been created from 1830 * various snippets on the gzinflate() PHP documentation. 1831 * 1832 * Warning: Magic numbers within. Due to the potential different formats that the compressed 1833 * data may be returned in, some "magic offsets" are needed to ensure proper decompression 1834 * takes place. For a simple progmatic way to determine the magic offset in use, see: 1835 * http://core.trac.wordpress.org/ticket/18273 1836 * 1837 * @since 2.8.1 1838 * @link http://core.trac.wordpress.org/ticket/18273 1839 * @link http://au2.php.net/manual/en/function.gzinflate.php#70875 1840 * @link http://au2.php.net/manual/en/function.gzinflate.php#77336 1841 * 1842 * @param string $gzData String to decompress. 1843 * @return string|bool False on failure. 1844 */ 1845 public static function compatible_gzinflate($gzData) { 1846 1847 // Compressed data might contain a full header, if so strip it for gzinflate() 1848 if ( substr($gzData, 0, 3) == "\x1f\x8b\x08" ) { 1849 $i = 10; 1850 $flg = ord( substr($gzData, 3, 1) ); 1851 if ( $flg > 0 ) { 1852 if ( $flg & 4 ) { 1853 list($xlen) = unpack('v', substr($gzData, $i, 2) ); 1854 $i = $i + 2 + $xlen; 1855 } 1856 if ( $flg & 8 ) 1857 $i = strpos($gzData, "\0", $i) + 1; 1858 if ( $flg & 16 ) 1859 $i = strpos($gzData, "\0", $i) + 1; 1860 if ( $flg & 2 ) 1861 $i = $i + 2; 1862 } 1863 $decompressed = @gzinflate( substr($gzData, $i, -8) ); 1864 if ( false !== $decompressed ) 1865 return $decompressed; 1866 } 1867 1868 // Compressed data from java.util.zip.Deflater amongst others. 1869 $decompressed = @gzinflate( substr($gzData, 2) ); 1870 if ( false !== $decompressed ) 1871 return $decompressed; 1872 1873 return false; 1874 } 1875 1876 /** 1877 * What encoding types to accept and their priority values. 1878 * 1879 * @since 2.8 1880 * 1881 * @return string Types of encoding to accept. 1882 */ 1883 public static function accept_encoding( $url, $args ) { 1884 $type = array(); 1885 $compression_enabled = WP_Http_Encoding::is_available(); 1886 1887 if ( ! $args['decompress'] ) // decompression specifically disabled 1888 $compression_enabled = false; 1889 elseif ( $args['stream'] ) // disable when streaming to file 1890 $compression_enabled = false; 1891 elseif ( isset( $args['limit_response_size'] ) ) // If only partial content is being requested, we won't be able to decompress it 1892 $compression_enabled = false; 1893 1894 if ( $compression_enabled ) { 1895 if ( function_exists( 'gzinflate' ) ) 1896 $type[] = 'deflate;q=1.0'; 1897 1898 if ( function_exists( 'gzuncompress' ) ) 1899 $type[] = 'compress;q=0.5'; 1900 1901 if ( function_exists( 'gzdecode' ) ) 1902 $type[] = 'gzip;q=0.5'; 1903 } 1904 1905 $type = apply_filters( 'wp_http_accept_encoding', $type, $url, $args ); 1906 1907 return implode(', ', $type); 1908 } 1909 1910 /** 1911 * What encoding the content used when it was compressed to send in the headers. 1912 * 1913 * @since 2.8 1914 * 1915 * @return string Content-Encoding string to send in the header. 1916 */ 1917 public static function content_encoding() { 1918 return 'deflate'; 1919 } 1920 1921 /** 1922 * Whether the content be decoded based on the headers. 1923 * 1924 * @since 2.8 1925 * 1926 * @param array|string $headers All of the available headers. 1927 * @return bool 1928 */ 1929 public static function should_decode($headers) { 1930 if ( is_array( $headers ) ) { 1931 if ( array_key_exists('content-encoding', $headers) && ! empty( $headers['content-encoding'] ) ) 1932 return true; 1933 } else if ( is_string( $headers ) ) { 1934 return ( stripos($headers, 'content-encoding:') !== false ); 1935 } 1936 1937 return false; 1938 } 1939 1940 /** 1941 * Whether decompression and compression are supported by the PHP version. 1942 * 1943 * Each function is tested instead of checking for the zlib extension, to 1944 * ensure that the functions all exist in the PHP version and aren't 1945 * disabled. 1946 * 1947 * @since 2.8 1948 * 1949 * @return bool 1950 */ 1951 public static function is_available() { 1952 return ( function_exists('gzuncompress') || function_exists('gzdeflate') || function_exists('gzinflate') ); 1953 } 1954 }
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| Generated: Tue Mar 25 01:41:18 2014 | WordPress honlapkészítés: online1.hu |