Changeset 33748 for trunk/src/wp-includes/class-http.php
- Timestamp:
- 08/26/2015 03:55:00 AM (9 years ago)
- File:
-
- 1 edited
-
trunk/src/wp-includes/class-http.php (modified) (2 diffs)
Legend:
- Unmodified
- Added
- Removed
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trunk/src/wp-includes/class-http.php
r32964 r33748 1 1 <?php 2 /**3 * Simple and uniform HTTP request API.4 *5 * Standardizes the HTTP requests for WordPress. Handles cookies, gzip encoding and decoding, chunk6 * decoding, if HTTP 1.1 and various other difficult HTTP protocol implementations.7 *8 * @link https://core.trac.wordpress.org/ticket/4779 HTTP API Proposal9 *10 * @package WordPress11 * @subpackage HTTP12 * @since 2.7.013 */14 15 2 /** 16 3 * WordPress HTTP Class for managing HTTP Transports and making HTTP requests. … … 878 865 879 866 } 880 881 /**882 * HTTP request method uses PHP Streams to retrieve the url.883 *884 * @since 2.7.0885 * @since 3.7.0 Combined with the fsockopen transport and switched to stream_socket_client().886 */887 class WP_Http_Streams {888 /**889 * Send a HTTP request to a URI using PHP Streams.890 *891 * @see WP_Http::request For default options descriptions.892 *893 * @since 2.7.0894 * @since 3.7.0 Combined with the fsockopen transport and switched to stream_socket_client().895 *896 * @access public897 * @param string $url The request URL.898 * @param string|array $args Optional. Override the defaults.899 * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error900 */901 public function request($url, $args = array()) {902 $defaults = array(903 'method' => 'GET', 'timeout' => 5,904 'redirection' => 5, 'httpversion' => '1.0',905 'blocking' => true,906 'headers' => array(), 'body' => null, 'cookies' => array()907 );908 909 $r = wp_parse_args( $args, $defaults );910 911 if ( isset( $r['headers']['User-Agent'] ) ) {912 $r['user-agent'] = $r['headers']['User-Agent'];913 unset( $r['headers']['User-Agent'] );914 } elseif ( isset( $r['headers']['user-agent'] ) ) {915 $r['user-agent'] = $r['headers']['user-agent'];916 unset( $r['headers']['user-agent'] );917 }918 919 // Construct Cookie: header if any cookies are set.920 WP_Http::buildCookieHeader( $r );921 922 $arrURL = parse_url($url);923 924 $connect_host = $arrURL['host'];925 926 $secure_transport = ( $arrURL['scheme'] == 'ssl' || $arrURL['scheme'] == 'https' );927 if ( ! isset( $arrURL['port'] ) ) {928 if ( $arrURL['scheme'] == 'ssl' || $arrURL['scheme'] == 'https' ) {929 $arrURL['port'] = 443;930 $secure_transport = true;931 } else {932 $arrURL['port'] = 80;933 }934 }935 936 // Always pass a Path, defaulting to the root in cases such as http://example.com937 if ( ! isset( $arrURL['path'] ) ) {938 $arrURL['path'] = '/';939 }940 941 if ( isset( $r['headers']['Host'] ) || isset( $r['headers']['host'] ) ) {942 if ( isset( $r['headers']['Host'] ) )943 $arrURL['host'] = $r['headers']['Host'];944 else945 $arrURL['host'] = $r['headers']['host'];946 unset( $r['headers']['Host'], $r['headers']['host'] );947 }948 949 /*950 * Certain versions of PHP have issues with 'localhost' and IPv6, It attempts to connect951 * to ::1, which fails when the server is not set up for it. For compatibility, always952 * connect to the IPv4 address.953 */954 if ( 'localhost' == strtolower( $connect_host ) )955 $connect_host = '127.0.0.1';956 957 $connect_host = $secure_transport ? 'ssl://' . $connect_host : 'tcp://' . $connect_host;958 959 $is_local = isset( $r['local'] ) && $r['local'];960 $ssl_verify = isset( $r['sslverify'] ) && $r['sslverify'];961 if ( $is_local ) {962 /**963 * Filter whether SSL should be verified for local requests.964 *965 * @since 2.8.0966 *967 * @param bool $ssl_verify Whether to verify the SSL connection. Default true.968 */969 $ssl_verify = apply_filters( 'https_local_ssl_verify', $ssl_verify );970 } elseif ( ! $is_local ) {971 /**972 * Filter whether SSL should be verified for non-local requests.973 *974 * @since 2.8.0975 *976 * @param bool $ssl_verify Whether to verify the SSL connection. Default true.977 */978 $ssl_verify = apply_filters( 'https_ssl_verify', $ssl_verify );979 }980 981 $proxy = new WP_HTTP_Proxy();982 983 $context = stream_context_create( array(984 'ssl' => array(985 'verify_peer' => $ssl_verify,986 //'CN_match' => $arrURL['host'], // This is handled by self::verify_ssl_certificate()987 'capture_peer_cert' => $ssl_verify,988 'SNI_enabled' => true,989 'cafile' => $r['sslcertificates'],990 'allow_self_signed' => ! $ssl_verify,991 )992 ) );993 994 $timeout = (int) floor( $r['timeout'] );995 $utimeout = $timeout == $r['timeout'] ? 0 : 1000000 * $r['timeout'] % 1000000;996 $connect_timeout = max( $timeout, 1 );997 998 // Store error number.999 $connection_error = null;1000 1001 // Store error string.1002 $connection_error_str = null;1003 1004 if ( !WP_DEBUG ) {1005 // In the event that the SSL connection fails, silence the many PHP Warnings.1006 if ( $secure_transport )1007 $error_reporting = error_reporting(0);1008 1009 if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) )1010 $handle = @stream_socket_client( 'tcp://' . $proxy->host() . ':' . $proxy->port(), $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context );1011 else1012 $handle = @stream_socket_client( $connect_host . ':' . $arrURL['port'], $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context );1013 1014 if ( $secure_transport )1015 error_reporting( $error_reporting );1016 1017 } else {1018 if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) )1019 $handle = stream_socket_client( 'tcp://' . $proxy->host() . ':' . $proxy->port(), $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context );1020 else1021 $handle = stream_socket_client( $connect_host . ':' . $arrURL['port'], $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context );1022 }1023 1024 if ( false === $handle ) {1025 // SSL connection failed due to expired/invalid cert, or, OpenSSL configuration is broken.1026 if ( $secure_transport && 0 === $connection_error && '' === $connection_error_str )1027 return new WP_Error( 'http_request_failed', __( 'The SSL certificate for the host could not be verified.' ) );1028 1029 return new WP_Error('http_request_failed', $connection_error . ': ' . $connection_error_str );1030 }1031 1032 // Verify that the SSL certificate is valid for this request.1033 if ( $secure_transport && $ssl_verify && ! $proxy->is_enabled() ) {1034 if ( ! self::verify_ssl_certificate( $handle, $arrURL['host'] ) )1035 return new WP_Error( 'http_request_failed', __( 'The SSL certificate for the host could not be verified.' ) );1036 }1037 1038 stream_set_timeout( $handle, $timeout, $utimeout );1039 1040 if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) //Some proxies require full URL in this field.1041 $requestPath = $url;1042 else1043 $requestPath = $arrURL['path'] . ( isset($arrURL['query']) ? '?' . $arrURL['query'] : '' );1044 1045 $strHeaders = strtoupper($r['method']) . ' ' . $requestPath . ' HTTP/' . $r['httpversion'] . "\r\n";1046 1047 $include_port_in_host_header = (1048 ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) ||1049 ( 'http' == $arrURL['scheme'] && 80 != $arrURL['port'] ) ||1050 ( 'https' == $arrURL['scheme'] && 443 != $arrURL['port'] )1051 );1052 1053 if ( $include_port_in_host_header ) {1054 $strHeaders .= 'Host: ' . $arrURL['host'] . ':' . $arrURL['port'] . "\r\n";1055 } else {1056 $strHeaders .= 'Host: ' . $arrURL['host'] . "\r\n";1057 }1058 1059 if ( isset($r['user-agent']) )1060 $strHeaders .= 'User-agent: ' . $r['user-agent'] . "\r\n";1061 1062 if ( is_array($r['headers']) ) {1063 foreach ( (array) $r['headers'] as $header => $headerValue )1064 $strHeaders .= $header . ': ' . $headerValue . "\r\n";1065 } else {1066 $strHeaders .= $r['headers'];1067 }1068 1069 if ( $proxy->use_authentication() )1070 $strHeaders .= $proxy->authentication_header() . "\r\n";1071 1072 $strHeaders .= "\r\n";1073 1074 if ( ! is_null($r['body']) )1075 $strHeaders .= $r['body'];1076 1077 fwrite($handle, $strHeaders);1078 1079 if ( ! $r['blocking'] ) {1080 stream_set_blocking( $handle, 0 );1081 fclose( $handle );1082 return array( 'headers' => array(), 'body' => '', 'response' => array('code' => false, 'message' => false), 'cookies' => array() );1083 }1084 1085 $strResponse = '';1086 $bodyStarted = false;1087 $keep_reading = true;1088 $block_size = 4096;1089 if ( isset( $r['limit_response_size'] ) )1090 $block_size = min( $block_size, $r['limit_response_size'] );1091 1092 // If streaming to a file setup the file handle.1093 if ( $r['stream'] ) {1094 if ( ! WP_DEBUG )1095 $stream_handle = @fopen( $r['filename'], 'w+' );1096 else1097 $stream_handle = fopen( $r['filename'], 'w+' );1098 if ( ! $stream_handle )1099 return new WP_Error( 'http_request_failed', sprintf( __( 'Could not open handle for fopen() to %s' ), $r['filename'] ) );1100 1101 $bytes_written = 0;1102 while ( ! feof($handle) && $keep_reading ) {1103 $block = fread( $handle, $block_size );1104 if ( ! $bodyStarted ) {1105 $strResponse .= $block;1106 if ( strpos( $strResponse, "\r\n\r\n" ) ) {1107 $process = WP_Http::processResponse( $strResponse );1108 $bodyStarted = true;1109 $block = $process['body'];1110 unset( $strResponse );1111 $process['body'] = '';1112 }1113 }1114 1115 $this_block_size = strlen( $block );1116 1117 if ( isset( $r['limit_response_size'] ) && ( $bytes_written + $this_block_size ) > $r['limit_response_size'] ) {1118 $this_block_size = ( $r['limit_response_size'] - $bytes_written );1119 $block = substr( $block, 0, $this_block_size );1120 }1121 1122 $bytes_written_to_file = fwrite( $stream_handle, $block );1123 1124 if ( $bytes_written_to_file != $this_block_size ) {1125 fclose( $handle );1126 fclose( $stream_handle );1127 return new WP_Error( 'http_request_failed', __( 'Failed to write request to temporary file.' ) );1128 }1129 1130 $bytes_written += $bytes_written_to_file;1131 1132 $keep_reading = !isset( $r['limit_response_size'] ) || $bytes_written < $r['limit_response_size'];1133 }1134 1135 fclose( $stream_handle );1136 1137 } else {1138 $header_length = 0;1139 while ( ! feof( $handle ) && $keep_reading ) {1140 $block = fread( $handle, $block_size );1141 $strResponse .= $block;1142 if ( ! $bodyStarted && strpos( $strResponse, "\r\n\r\n" ) ) {1143 $header_length = strpos( $strResponse, "\r\n\r\n" ) + 4;1144 $bodyStarted = true;1145 }1146 $keep_reading = ( ! $bodyStarted || !isset( $r['limit_response_size'] ) || strlen( $strResponse ) < ( $header_length + $r['limit_response_size'] ) );1147 }1148 1149 $process = WP_Http::processResponse( $strResponse );1150 unset( $strResponse );1151 1152 }1153 1154 fclose( $handle );1155 1156 $arrHeaders = WP_Http::processHeaders( $process['headers'], $url );1157 1158 $response = array(1159 'headers' => $arrHeaders['headers'],1160 // Not yet processed.1161 'body' => null,1162 'response' => $arrHeaders['response'],1163 'cookies' => $arrHeaders['cookies'],1164 'filename' => $r['filename']1165 );1166 1167 // Handle redirects.1168 if ( false !== ( $redirect_response = WP_HTTP::handle_redirects( $url, $r, $response ) ) )1169 return $redirect_response;1170 1171 // If the body was chunk encoded, then decode it.1172 if ( ! empty( $process['body'] ) && isset( $arrHeaders['headers']['transfer-encoding'] ) && 'chunked' == $arrHeaders['headers']['transfer-encoding'] )1173 $process['body'] = WP_Http::chunkTransferDecode($process['body']);1174 1175 if ( true === $r['decompress'] && true === WP_Http_Encoding::should_decode($arrHeaders['headers']) )1176 $process['body'] = WP_Http_Encoding::decompress( $process['body'] );1177 1178 if ( isset( $r['limit_response_size'] ) && strlen( $process['body'] ) > $r['limit_response_size'] )1179 $process['body'] = substr( $process['body'], 0, $r['limit_response_size'] );1180 1181 $response['body'] = $process['body'];1182 1183 return $response;1184 }1185 1186 /**1187 * Verifies the received SSL certificate against it's Common Names and subjectAltName fields1188 *1189 * PHP's SSL verifications only verify that it's a valid Certificate, it doesn't verify if1190 * the certificate is valid for the hostname which was requested.1191 * This function verifies the requested hostname against certificate's subjectAltName field,1192 * if that is empty, or contains no DNS entries, a fallback to the Common Name field is used.1193 *1194 * IP Address support is included if the request is being made to an IP address.1195 *1196 * @since 3.7.01197 * @static1198 *1199 * @param stream $stream The PHP Stream which the SSL request is being made over1200 * @param string $host The hostname being requested1201 * @return bool If the cerficiate presented in $stream is valid for $host1202 */1203 public static function verify_ssl_certificate( $stream, $host ) {1204 $context_options = stream_context_get_options( $stream );1205 1206 if ( empty( $context_options['ssl']['peer_certificate'] ) )1207 return false;1208 1209 $cert = openssl_x509_parse( $context_options['ssl']['peer_certificate'] );1210 if ( ! $cert )1211 return false;1212 1213 /*1214 * If the request is being made to an IP address, we'll validate against IP fields1215 * in the cert (if they exist)1216 */1217 $host_type = ( WP_HTTP::is_ip_address( $host ) ? 'ip' : 'dns' );1218 1219 $certificate_hostnames = array();1220 if ( ! empty( $cert['extensions']['subjectAltName'] ) ) {1221 $match_against = preg_split( '/,\s*/', $cert['extensions']['subjectAltName'] );1222 foreach ( $match_against as $match ) {1223 list( $match_type, $match_host ) = explode( ':', $match );1224 if ( $host_type == strtolower( trim( $match_type ) ) ) // IP: or DNS:1225 $certificate_hostnames[] = strtolower( trim( $match_host ) );1226 }1227 } elseif ( !empty( $cert['subject']['CN'] ) ) {1228 // Only use the CN when the certificate includes no subjectAltName extension.1229 $certificate_hostnames[] = strtolower( $cert['subject']['CN'] );1230 }1231 1232 // Exact hostname/IP matches.1233 if ( in_array( strtolower( $host ), $certificate_hostnames ) )1234 return true;1235 1236 // IP's can't be wildcards, Stop processing.1237 if ( 'ip' == $host_type )1238 return false;1239 1240 // Test to see if the domain is at least 2 deep for wildcard support.1241 if ( substr_count( $host, '.' ) < 2 )1242 return false;1243 1244 // Wildcard subdomains certs (*.example.com) are valid for a.example.com but not a.b.example.com.1245 $wildcard_host = preg_replace( '/^[^.]+\./', '*.', $host );1246 1247 return in_array( strtolower( $wildcard_host ), $certificate_hostnames );1248 }1249 1250 /**1251 * Whether this class can be used for retrieving a URL.1252 *1253 * @static1254 * @access public1255 * @since 2.7.01256 * @since 3.7.0 Combined with the fsockopen transport and switched to stream_socket_client().1257 *1258 * @return bool False means this class can not be used, true means it can.1259 */1260 public static function test( $args = array() ) {1261 if ( ! function_exists( 'stream_socket_client' ) )1262 return false;1263 1264 $is_ssl = isset( $args['ssl'] ) && $args['ssl'];1265 1266 if ( $is_ssl ) {1267 if ( ! extension_loaded( 'openssl' ) )1268 return false;1269 if ( ! function_exists( 'openssl_x509_parse' ) )1270 return false;1271 }1272 1273 /**1274 * Filter whether streams can be used as a transport for retrieving a URL.1275 *1276 * @since 2.7.01277 *1278 * @param bool $use_class Whether the class can be used. Default true.1279 * @param array $args Request arguments.1280 */1281 return apply_filters( 'use_streams_transport', true, $args );1282 }1283 }1284 1285 /**1286 * Deprecated HTTP Transport method which used fsockopen.1287 *1288 * This class is not used, and is included for backwards compatibility only.1289 * All code should make use of WP_HTTP directly through it's API.1290 *1291 * @see WP_HTTP::request1292 *1293 * @since 2.7.01294 * @deprecated 3.7.0 Please use WP_HTTP::request() directly1295 */1296 class WP_HTTP_Fsockopen extends WP_HTTP_Streams {1297 // For backwards compatibility for users who are using the class directly.1298 }1299 1300 /**1301 * HTTP request method uses Curl extension to retrieve the url.1302 *1303 * Requires the Curl extension to be installed.1304 *1305 * @package WordPress1306 * @subpackage HTTP1307 * @since 2.7.01308 */1309 class WP_Http_Curl {1310 1311 /**1312 * Temporary header storage for during requests.1313 *1314 * @since 3.2.01315 * @access private1316 * @var string1317 */1318 private $headers = '';1319 1320 /**1321 * Temporary body storage for during requests.1322 *1323 * @since 3.6.01324 * @access private1325 * @var string1326 */1327 private $body = '';1328 1329 /**1330 * The maximum amount of data to receive from the remote server.1331 *1332 * @since 3.6.01333 * @access private1334 * @var int1335 */1336 private $max_body_length = false;1337 1338 /**1339 * The file resource used for streaming to file.1340 *1341 * @since 3.6.01342 * @access private1343 * @var resource1344 */1345 private $stream_handle = false;1346 1347 /**1348 * The total bytes written in the current request.1349 *1350 * @since 4.1.01351 * @access private1352 * @var int1353 */1354 private $bytes_written_total = 0;1355 1356 /**1357 * Send a HTTP request to a URI using cURL extension.1358 *1359 * @access public1360 * @since 2.7.01361 *1362 * @param string $url The request URL.1363 * @param string|array $args Optional. Override the defaults.1364 * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error1365 */1366 public function request($url, $args = array()) {1367 $defaults = array(1368 'method' => 'GET', 'timeout' => 5,1369 'redirection' => 5, 'httpversion' => '1.0',1370 'blocking' => true,1371 'headers' => array(), 'body' => null, 'cookies' => array()1372 );1373 1374 $r = wp_parse_args( $args, $defaults );1375 1376 if ( isset( $r['headers']['User-Agent'] ) ) {1377 $r['user-agent'] = $r['headers']['User-Agent'];1378 unset( $r['headers']['User-Agent'] );1379 } elseif ( isset( $r['headers']['user-agent'] ) ) {1380 $r['user-agent'] = $r['headers']['user-agent'];1381 unset( $r['headers']['user-agent'] );1382 }1383 1384 // Construct Cookie: header if any cookies are set.1385 WP_Http::buildCookieHeader( $r );1386 1387 $handle = curl_init();1388 1389 // cURL offers really easy proxy support.1390 $proxy = new WP_HTTP_Proxy();1391 1392 if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) {1393 1394 curl_setopt( $handle, CURLOPT_PROXYTYPE, CURLPROXY_HTTP );1395 curl_setopt( $handle, CURLOPT_PROXY, $proxy->host() );1396 curl_setopt( $handle, CURLOPT_PROXYPORT, $proxy->port() );1397 1398 if ( $proxy->use_authentication() ) {1399 curl_setopt( $handle, CURLOPT_PROXYAUTH, CURLAUTH_ANY );1400 curl_setopt( $handle, CURLOPT_PROXYUSERPWD, $proxy->authentication() );1401 }1402 }1403 1404 $is_local = isset($r['local']) && $r['local'];1405 $ssl_verify = isset($r['sslverify']) && $r['sslverify'];1406 if ( $is_local ) {1407 /** This filter is documented in wp-includes/class-http.php */1408 $ssl_verify = apply_filters( 'https_local_ssl_verify', $ssl_verify );1409 } elseif ( ! $is_local ) {1410 /** This filter is documented in wp-includes/class-http.php */1411 $ssl_verify = apply_filters( 'https_ssl_verify', $ssl_verify );1412 }1413 1414 /*1415 * CURLOPT_TIMEOUT and CURLOPT_CONNECTTIMEOUT expect integers. Have to use ceil since.1416 * a value of 0 will allow an unlimited timeout.1417 */1418 $timeout = (int) ceil( $r['timeout'] );1419 curl_setopt( $handle, CURLOPT_CONNECTTIMEOUT, $timeout );1420 curl_setopt( $handle, CURLOPT_TIMEOUT, $timeout );1421 1422 curl_setopt( $handle, CURLOPT_URL, $url);1423 curl_setopt( $handle, CURLOPT_RETURNTRANSFER, true );1424 curl_setopt( $handle, CURLOPT_SSL_VERIFYHOST, ( $ssl_verify === true ) ? 2 : false );1425 curl_setopt( $handle, CURLOPT_SSL_VERIFYPEER, $ssl_verify );1426 curl_setopt( $handle, CURLOPT_CAINFO, $r['sslcertificates'] );1427 curl_setopt( $handle, CURLOPT_USERAGENT, $r['user-agent'] );1428 1429 /*1430 * The option doesn't work with safe mode or when open_basedir is set, and there's1431 * a bug #17490 with redirected POST requests, so handle redirections outside Curl.1432 */1433 curl_setopt( $handle, CURLOPT_FOLLOWLOCATION, false );1434 if ( defined( 'CURLOPT_PROTOCOLS' ) ) // PHP 5.2.10 / cURL 7.19.41435 curl_setopt( $handle, CURLOPT_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS );1436 1437 switch ( $r['method'] ) {1438 case 'HEAD':1439 curl_setopt( $handle, CURLOPT_NOBODY, true );1440 break;1441 case 'POST':1442 curl_setopt( $handle, CURLOPT_POST, true );1443 curl_setopt( $handle, CURLOPT_POSTFIELDS, $r['body'] );1444 break;1445 case 'PUT':1446 curl_setopt( $handle, CURLOPT_CUSTOMREQUEST, 'PUT' );1447 curl_setopt( $handle, CURLOPT_POSTFIELDS, $r['body'] );1448 break;1449 default:1450 curl_setopt( $handle, CURLOPT_CUSTOMREQUEST, $r['method'] );1451 if ( ! is_null( $r['body'] ) )1452 curl_setopt( $handle, CURLOPT_POSTFIELDS, $r['body'] );1453 break;1454 }1455 1456 if ( true === $r['blocking'] ) {1457 curl_setopt( $handle, CURLOPT_HEADERFUNCTION, array( $this, 'stream_headers' ) );1458 curl_setopt( $handle, CURLOPT_WRITEFUNCTION, array( $this, 'stream_body' ) );1459 }1460 1461 curl_setopt( $handle, CURLOPT_HEADER, false );1462 1463 if ( isset( $r['limit_response_size'] ) )1464 $this->max_body_length = intval( $r['limit_response_size'] );1465 else1466 $this->max_body_length = false;1467 1468 // If streaming to a file open a file handle, and setup our curl streaming handler.1469 if ( $r['stream'] ) {1470 if ( ! WP_DEBUG )1471 $this->stream_handle = @fopen( $r['filename'], 'w+' );1472 else1473 $this->stream_handle = fopen( $r['filename'], 'w+' );1474 if ( ! $this->stream_handle )1475 return new WP_Error( 'http_request_failed', sprintf( __( 'Could not open handle for fopen() to %s' ), $r['filename'] ) );1476 } else {1477 $this->stream_handle = false;1478 }1479 1480 if ( !empty( $r['headers'] ) ) {1481 // cURL expects full header strings in each element.1482 $headers = array();1483 foreach ( $r['headers'] as $name => $value ) {1484 $headers[] = "{$name}: $value";1485 }1486 curl_setopt( $handle, CURLOPT_HTTPHEADER, $headers );1487 }1488 1489 if ( $r['httpversion'] == '1.0' )1490 curl_setopt( $handle, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0 );1491 else1492 curl_setopt( $handle, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1 );1493 1494 /**1495 * Fires before the cURL request is executed.1496 *1497 * Cookies are not currently handled by the HTTP API. This action allows1498 * plugins to handle cookies themselves.1499 *1500 * @since 2.8.01501 *1502 * @param resource &$handle The cURL handle returned by curl_init().1503 * @param array $r The HTTP request arguments.1504 * @param string $url The request URL.1505 */1506 do_action_ref_array( 'http_api_curl', array( &$handle, $r, $url ) );1507 1508 // We don't need to return the body, so don't. Just execute request and return.1509 if ( ! $r['blocking'] ) {1510 curl_exec( $handle );1511 1512 if ( $curl_error = curl_error( $handle ) ) {1513 curl_close( $handle );1514 return new WP_Error( 'http_request_failed', $curl_error );1515 }1516 if ( in_array( curl_getinfo( $handle, CURLINFO_HTTP_CODE ), array( 301, 302 ) ) ) {1517 curl_close( $handle );1518 return new WP_Error( 'http_request_failed', __( 'Too many redirects.' ) );1519 }1520 1521 curl_close( $handle );1522 return array( 'headers' => array(), 'body' => '', 'response' => array('code' => false, 'message' => false), 'cookies' => array() );1523 }1524 1525 curl_exec( $handle );1526 $theHeaders = WP_Http::processHeaders( $this->headers, $url );1527 $theBody = $this->body;1528 $bytes_written_total = $this->bytes_written_total;1529 1530 $this->headers = '';1531 $this->body = '';1532 $this->bytes_written_total = 0;1533 1534 $curl_error = curl_errno( $handle );1535 1536 // If an error occurred, or, no response.1537 if ( $curl_error || ( 0 == strlen( $theBody ) && empty( $theHeaders['headers'] ) ) ) {1538 if ( CURLE_WRITE_ERROR /* 23 */ == $curl_error ) {1539 if ( ! $this->max_body_length || $this->max_body_length != $bytes_written_total ) {1540 if ( $r['stream'] ) {1541 curl_close( $handle );1542 fclose( $this->stream_handle );1543 return new WP_Error( 'http_request_failed', __( 'Failed to write request to temporary file.' ) );1544 } else {1545 curl_close( $handle );1546 return new WP_Error( 'http_request_failed', curl_error( $handle ) );1547 }1548 }1549 } else {1550 if ( $curl_error = curl_error( $handle ) ) {1551 curl_close( $handle );1552 return new WP_Error( 'http_request_failed', $curl_error );1553 }1554 }1555 if ( in_array( curl_getinfo( $handle, CURLINFO_HTTP_CODE ), array( 301, 302 ) ) ) {1556 curl_close( $handle );1557 return new WP_Error( 'http_request_failed', __( 'Too many redirects.' ) );1558 }1559 }1560 1561 curl_close( $handle );1562 1563 if ( $r['stream'] )1564 fclose( $this->stream_handle );1565 1566 $response = array(1567 'headers' => $theHeaders['headers'],1568 'body' => null,1569 'response' => $theHeaders['response'],1570 'cookies' => $theHeaders['cookies'],1571 'filename' => $r['filename']1572 );1573 1574 // Handle redirects.1575 if ( false !== ( $redirect_response = WP_HTTP::handle_redirects( $url, $r, $response ) ) )1576 return $redirect_response;1577 1578 if ( true === $r['decompress'] && true === WP_Http_Encoding::should_decode($theHeaders['headers']) )1579 $theBody = WP_Http_Encoding::decompress( $theBody );1580 1581 $response['body'] = $theBody;1582 1583 return $response;1584 }1585 1586 /**1587 * Grab the headers of the cURL request1588 *1589 * Each header is sent individually to this callback, so we append to the $header property for temporary storage1590 *1591 * @since 3.2.01592 * @access private1593 * @return int1594 */1595 private function stream_headers( $handle, $headers ) {1596 $this->headers .= $headers;1597 return strlen( $headers );1598 }1599 1600 /**1601 * Grab the body of the cURL request1602 *1603 * The contents of the document are passed in chunks, so we append to the $body property for temporary storage.1604 * Returning a length shorter than the length of $data passed in will cause cURL to abort the request with CURLE_WRITE_ERROR1605 *1606 * @since 3.6.01607 * @access private1608 * @return int1609 */1610 private function stream_body( $handle, $data ) {1611 $data_length = strlen( $data );1612 1613 if ( $this->max_body_length && ( $this->bytes_written_total + $data_length ) > $this->max_body_length ) {1614 $data_length = ( $this->max_body_length - $this->bytes_written_total );1615 $data = substr( $data, 0, $data_length );1616 }1617 1618 if ( $this->stream_handle ) {1619 $bytes_written = fwrite( $this->stream_handle, $data );1620 } else {1621 $this->body .= $data;1622 $bytes_written = $data_length;1623 }1624 1625 $this->bytes_written_total += $bytes_written;1626 1627 // Upon event of this function returning less than strlen( $data ) curl will error with CURLE_WRITE_ERROR.1628 return $bytes_written;1629 }1630 1631 /**1632 * Whether this class can be used for retrieving an URL.1633 *1634 * @static1635 * @since 2.7.01636 *1637 * @return bool False means this class can not be used, true means it can.1638 */1639 public static function test( $args = array() ) {1640 if ( ! function_exists( 'curl_init' ) || ! function_exists( 'curl_exec' ) )1641 return false;1642 1643 $is_ssl = isset( $args['ssl'] ) && $args['ssl'];1644 1645 if ( $is_ssl ) {1646 $curl_version = curl_version();1647 // Check whether this cURL version support SSL requests.1648 if ( ! (CURL_VERSION_SSL & $curl_version['features']) )1649 return false;1650 }1651 1652 /**1653 * Filter whether cURL can be used as a transport for retrieving a URL.1654 *1655 * @since 2.7.01656 *1657 * @param bool $use_class Whether the class can be used. Default true.1658 * @param array $args An array of request arguments.1659 */1660 return apply_filters( 'use_curl_transport', true, $args );1661 }1662 }1663 1664 /**1665 * Adds Proxy support to the WordPress HTTP API.1666 *1667 * There are caveats to proxy support. It requires that defines be made in the wp-config.php file to1668 * enable proxy support. There are also a few filters that plugins can hook into for some of the1669 * constants.1670 *1671 * Please note that only BASIC authentication is supported by most transports.1672 * cURL MAY support more methods (such as NTLM authentication) depending on your environment.1673 *1674 * The constants are as follows:1675 * <ol>1676 * <li>WP_PROXY_HOST - Enable proxy support and host for connecting.</li>1677 * <li>WP_PROXY_PORT - Proxy port for connection. No default, must be defined.</li>1678 * <li>WP_PROXY_USERNAME - Proxy username, if it requires authentication.</li>1679 * <li>WP_PROXY_PASSWORD - Proxy password, if it requires authentication.</li>1680 * <li>WP_PROXY_BYPASS_HOSTS - Will prevent the hosts in this list from going through the proxy.1681 * You do not need to have localhost and the blog host in this list, because they will not be passed1682 * through the proxy. The list should be presented in a comma separated list, wildcards using * are supported, eg. *.wordpress.org</li>1683 * </ol>1684 *1685 * An example can be as seen below.1686 *1687 * define('WP_PROXY_HOST', '192.168.84.101');1688 * define('WP_PROXY_PORT', '8080');1689 * define('WP_PROXY_BYPASS_HOSTS', 'localhost, www.example.com, *.wordpress.org');1690 *1691 * @link https://core.trac.wordpress.org/ticket/4011 Proxy support ticket in WordPress.1692 * @link https://core.trac.wordpress.org/ticket/14636 Allow wildcard domains in WP_PROXY_BYPASS_HOSTS1693 * @since 2.8.01694 */1695 class WP_HTTP_Proxy {1696 1697 /**1698 * Whether proxy connection should be used.1699 *1700 * @since 2.8.01701 *1702 * @use WP_PROXY_HOST1703 * @use WP_PROXY_PORT1704 *1705 * @return bool1706 */1707 public function is_enabled() {1708 return defined('WP_PROXY_HOST') && defined('WP_PROXY_PORT');1709 }1710 1711 /**1712 * Whether authentication should be used.1713 *1714 * @since 2.8.01715 *1716 * @use WP_PROXY_USERNAME1717 * @use WP_PROXY_PASSWORD1718 *1719 * @return bool1720 */1721 public function use_authentication() {1722 return defined('WP_PROXY_USERNAME') && defined('WP_PROXY_PASSWORD');1723 }1724 1725 /**1726 * Retrieve the host for the proxy server.1727 *1728 * @since 2.8.01729 *1730 * @return string1731 */1732 public function host() {1733 if ( defined('WP_PROXY_HOST') )1734 return WP_PROXY_HOST;1735 1736 return '';1737 }1738 1739 /**1740 * Retrieve the port for the proxy server.1741 *1742 * @since 2.8.01743 *1744 * @return string1745 */1746 public function port() {1747 if ( defined('WP_PROXY_PORT') )1748 return WP_PROXY_PORT;1749 1750 return '';1751 }1752 1753 /**1754 * Retrieve the username for proxy authentication.1755 *1756 * @since 2.8.01757 *1758 * @return string1759 */1760 public function username() {1761 if ( defined('WP_PROXY_USERNAME') )1762 return WP_PROXY_USERNAME;1763 1764 return '';1765 }1766 1767 /**1768 * Retrieve the password for proxy authentication.1769 *1770 * @since 2.8.01771 *1772 * @return string1773 */1774 public function password() {1775 if ( defined('WP_PROXY_PASSWORD') )1776 return WP_PROXY_PASSWORD;1777 1778 return '';1779 }1780 1781 /**1782 * Retrieve authentication string for proxy authentication.1783 *1784 * @since 2.8.01785 *1786 * @return string1787 */1788 public function authentication() {1789 return $this->username() . ':' . $this->password();1790 }1791 1792 /**1793 * Retrieve header string for proxy authentication.1794 *1795 * @since 2.8.01796 *1797 * @return string1798 */1799 public function authentication_header() {1800 return 'Proxy-Authorization: Basic ' . base64_encode( $this->authentication() );1801 }1802 1803 /**1804 * Whether URL should be sent through the proxy server.1805 *1806 * We want to keep localhost and the blog URL from being sent through the proxy server, because1807 * some proxies can not handle this. We also have the constant available for defining other1808 * hosts that won't be sent through the proxy.1809 *1810 * @since 2.8.01811 *1812 * @staticvar array|null $bypass_hosts1813 * @staticvar array $wildcard_regex1814 *1815 * @param string $uri URI to check.1816 * @return bool True, to send through the proxy and false if, the proxy should not be used.1817 */1818 public function send_through_proxy( $uri ) {1819 /*1820 * parse_url() only handles http, https type URLs, and will emit E_WARNING on failure.1821 * This will be displayed on blogs, which is not reasonable.1822 */1823 $check = @parse_url($uri);1824 1825 // Malformed URL, can not process, but this could mean ssl, so let through anyway.1826 if ( $check === false )1827 return true;1828 1829 $home = parse_url( get_option('siteurl') );1830 1831 /**1832 * Filter whether to preempt sending the request through the proxy server.1833 *1834 * Returning false will bypass the proxy; returning true will send1835 * the request through the proxy. Returning null bypasses the filter.1836 *1837 * @since 3.5.01838 *1839 * @param null $override Whether to override the request result. Default null.1840 * @param string $uri URL to check.1841 * @param array $check Associative array result of parsing the URI.1842 * @param array $home Associative array result of parsing the site URL.1843 */1844 $result = apply_filters( 'pre_http_send_through_proxy', null, $uri, $check, $home );1845 if ( ! is_null( $result ) )1846 return $result;1847 1848 if ( 'localhost' == $check['host'] || ( isset( $home['host'] ) && $home['host'] == $check['host'] ) )1849 return false;1850 1851 if ( !defined('WP_PROXY_BYPASS_HOSTS') )1852 return true;1853 1854 static $bypass_hosts = null;1855 static $wildcard_regex = array();1856 if ( null === $bypass_hosts ) {1857 $bypass_hosts = preg_split('|,\s*|', WP_PROXY_BYPASS_HOSTS);1858 1859 if ( false !== strpos(WP_PROXY_BYPASS_HOSTS, '*') ) {1860 $wildcard_regex = array();1861 foreach ( $bypass_hosts as $host )1862 $wildcard_regex[] = str_replace( '\*', '.+', preg_quote( $host, '/' ) );1863 $wildcard_regex = '/^(' . implode('|', $wildcard_regex) . ')$/i';1864 }1865 }1866 1867 if ( !empty($wildcard_regex) )1868 return !preg_match($wildcard_regex, $check['host']);1869 else1870 return !in_array( $check['host'], $bypass_hosts );1871 }1872 }1873 /**1874 * Internal representation of a single cookie.1875 *1876 * Returned cookies are represented using this class, and when cookies are set, if they are not1877 * already a WP_Http_Cookie() object, then they are turned into one.1878 *1879 * @todo The WordPress convention is to use underscores instead of camelCase for function and method1880 * names. Need to switch to use underscores instead for the methods.1881 *1882 * @package WordPress1883 * @subpackage HTTP1884 * @since 2.8.01885 */1886 class WP_Http_Cookie {1887 1888 /**1889 * Cookie name.1890 *1891 * @since 2.8.01892 * @var string1893 */1894 public $name;1895 1896 /**1897 * Cookie value.1898 *1899 * @since 2.8.01900 * @var string1901 */1902 public $value;1903 1904 /**1905 * When the cookie expires.1906 *1907 * @since 2.8.01908 * @var string1909 */1910 public $expires;1911 1912 /**1913 * Cookie URL path.1914 *1915 * @since 2.8.01916 * @var string1917 */1918 public $path;1919 1920 /**1921 * Cookie Domain.1922 *1923 * @since 2.8.01924 * @var string1925 */1926 public $domain;1927 1928 /**1929 * Sets up this cookie object.1930 *1931 * The parameter $data should be either an associative array containing the indices names below1932 * or a header string detailing it.1933 *1934 * @since 2.8.01935 * @access public1936 *1937 * @param string|array $data {1938 * Raw cookie data as header string or data array.1939 *1940 * @type string $name Cookie name.1941 * @type mixed $value Value. Should NOT already be urlencoded.1942 * @type string|int $expires Optional. Unix timestamp or formatted date. Default null.1943 * @type string $path Optional. Path. Default '/'.1944 * @type string $domain Optional. Domain. Default host of parsed $requested_url.1945 * @type int $port Optional. Port. Default null.1946 * }1947 * @param string $requested_url The URL which the cookie was set on, used for default $domain1948 * and $port values.1949 */1950 public function __construct( $data, $requested_url = '' ) {1951 if ( $requested_url )1952 $arrURL = @parse_url( $requested_url );1953 if ( isset( $arrURL['host'] ) )1954 $this->domain = $arrURL['host'];1955 $this->path = isset( $arrURL['path'] ) ? $arrURL['path'] : '/';1956 if ( '/' != substr( $this->path, -1 ) )1957 $this->path = dirname( $this->path ) . '/';1958 1959 if ( is_string( $data ) ) {1960 // Assume it's a header string direct from a previous request.1961 $pairs = explode( ';', $data );1962 1963 // Special handling for first pair; name=value. Also be careful of "=" in value.1964 $name = trim( substr( $pairs[0], 0, strpos( $pairs[0], '=' ) ) );1965 $value = substr( $pairs[0], strpos( $pairs[0], '=' ) + 1 );1966 $this->name = $name;1967 $this->value = urldecode( $value );1968 1969 // Removes name=value from items.1970 array_shift( $pairs );1971 1972 // Set everything else as a property.1973 foreach ( $pairs as $pair ) {1974 $pair = rtrim($pair);1975 1976 // Handle the cookie ending in ; which results in a empty final pair.1977 if ( empty($pair) )1978 continue;1979 1980 list( $key, $val ) = strpos( $pair, '=' ) ? explode( '=', $pair ) : array( $pair, '' );1981 $key = strtolower( trim( $key ) );1982 if ( 'expires' == $key )1983 $val = strtotime( $val );1984 $this->$key = $val;1985 }1986 } else {1987 if ( !isset( $data['name'] ) )1988 return;1989 1990 // Set properties based directly on parameters.1991 foreach ( array( 'name', 'value', 'path', 'domain', 'port' ) as $field ) {1992 if ( isset( $data[ $field ] ) )1993 $this->$field = $data[ $field ];1994 }1995 1996 if ( isset( $data['expires'] ) )1997 $this->expires = is_int( $data['expires'] ) ? $data['expires'] : strtotime( $data['expires'] );1998 else1999 $this->expires = null;2000 }2001 }2002 2003 /**2004 * Confirms that it's OK to send this cookie to the URL checked against.2005 *2006 * Decision is based on RFC 2109/2965, so look there for details on validity.2007 *2008 * @access public2009 * @since 2.8.02010 *2011 * @param string $url URL you intend to send this cookie to2012 * @return bool true if allowed, false otherwise.2013 */2014 public function test( $url ) {2015 if ( is_null( $this->name ) )2016 return false;2017 2018 // Expires - if expired then nothing else matters.2019 if ( isset( $this->expires ) && time() > $this->expires )2020 return false;2021 2022 // Get details on the URL we're thinking about sending to.2023 $url = parse_url( $url );2024 $url['port'] = isset( $url['port'] ) ? $url['port'] : ( 'https' == $url['scheme'] ? 443 : 80 );2025 $url['path'] = isset( $url['path'] ) ? $url['path'] : '/';2026 2027 // Values to use for comparison against the URL.2028 $path = isset( $this->path ) ? $this->path : '/';2029 $port = isset( $this->port ) ? $this->port : null;2030 $domain = isset( $this->domain ) ? strtolower( $this->domain ) : strtolower( $url['host'] );2031 if ( false === stripos( $domain, '.' ) )2032 $domain .= '.local';2033 2034 // Host - very basic check that the request URL ends with the domain restriction (minus leading dot).2035 $domain = substr( $domain, 0, 1 ) == '.' ? substr( $domain, 1 ) : $domain;2036 if ( substr( $url['host'], -strlen( $domain ) ) != $domain )2037 return false;2038 2039 // Port - supports "port-lists" in the format: "80,8000,8080".2040 if ( !empty( $port ) && !in_array( $url['port'], explode( ',', $port) ) )2041 return false;2042 2043 // Path - request path must start with path restriction.2044 if ( substr( $url['path'], 0, strlen( $path ) ) != $path )2045 return false;2046 2047 return true;2048 }2049 2050 /**2051 * Convert cookie name and value back to header string.2052 *2053 * @access public2054 * @since 2.8.02055 *2056 * @return string Header encoded cookie name and value.2057 */2058 public function getHeaderValue() {2059 if ( ! isset( $this->name ) || ! isset( $this->value ) )2060 return '';2061 2062 /**2063 * Filter the header-encoded cookie value.2064 *2065 * @since 3.4.02066 *2067 * @param string $value The cookie value.2068 * @param string $name The cookie name.2069 */2070 return $this->name . '=' . apply_filters( 'wp_http_cookie_value', $this->value, $this->name );2071 }2072 2073 /**2074 * Retrieve cookie header for usage in the rest of the WordPress HTTP API.2075 *2076 * @access public2077 * @since 2.8.02078 *2079 * @return string2080 */2081 public function getFullHeader() {2082 return 'Cookie: ' . $this->getHeaderValue();2083 }2084 }2085 2086 /**2087 * Implementation for deflate and gzip transfer encodings.2088 *2089 * Includes RFC 1950, RFC 1951, and RFC 1952.2090 *2091 * @since 2.8.02092 * @package WordPress2093 * @subpackage HTTP2094 */2095 class WP_Http_Encoding {2096 2097 /**2098 * Compress raw string using the deflate format.2099 *2100 * Supports the RFC 1951 standard.2101 *2102 * @since 2.8.02103 *2104 * @static2105 *2106 * @param string $raw String to compress.2107 * @param int $level Optional, default is 9. Compression level, 9 is highest.2108 * @param string $supports Optional, not used. When implemented it will choose the right compression based on what the server supports.2109 * @return string|false False on failure.2110 */2111 public static function compress( $raw, $level = 9, $supports = null ) {2112 return gzdeflate( $raw, $level );2113 }2114 2115 /**2116 * Decompression of deflated string.2117 *2118 * Will attempt to decompress using the RFC 1950 standard, and if that fails2119 * then the RFC 1951 standard deflate will be attempted. Finally, the RFC2120 * 1952 standard gzip decode will be attempted. If all fail, then the2121 * original compressed string will be returned.2122 *2123 * @since 2.8.02124 *2125 * @static2126 *2127 * @param string $compressed String to decompress.2128 * @param int $length The optional length of the compressed data.2129 * @return string|bool False on failure.2130 */2131 public static function decompress( $compressed, $length = null ) {2132 2133 if ( empty($compressed) )2134 return $compressed;2135 2136 if ( false !== ( $decompressed = @gzinflate( $compressed ) ) )2137 return $decompressed;2138 2139 if ( false !== ( $decompressed = self::compatible_gzinflate( $compressed ) ) )2140 return $decompressed;2141 2142 if ( false !== ( $decompressed = @gzuncompress( $compressed ) ) )2143 return $decompressed;2144 2145 if ( function_exists('gzdecode') ) {2146 $decompressed = @gzdecode( $compressed );2147 2148 if ( false !== $decompressed )2149 return $decompressed;2150 }2151 2152 return $compressed;2153 }2154 2155 /**2156 * Decompression of deflated string while staying compatible with the majority of servers.2157 *2158 * Certain Servers will return deflated data with headers which PHP's gzinflate()2159 * function cannot handle out of the box. The following function has been created from2160 * various snippets on the gzinflate() PHP documentation.2161 *2162 * Warning: Magic numbers within. Due to the potential different formats that the compressed2163 * data may be returned in, some "magic offsets" are needed to ensure proper decompression2164 * takes place. For a simple progmatic way to determine the magic offset in use, see:2165 * https://core.trac.wordpress.org/ticket/182732166 *2167 * @since 2.8.12168 * @link https://core.trac.wordpress.org/ticket/182732169 * @link http://au2.php.net/manual/en/function.gzinflate.php#708752170 * @link http://au2.php.net/manual/en/function.gzinflate.php#773362171 *2172 * @static2173 *2174 * @param string $gzData String to decompress.2175 * @return string|bool False on failure.2176 */2177 public static function compatible_gzinflate($gzData) {2178 2179 // Compressed data might contain a full header, if so strip it for gzinflate().2180 if ( substr($gzData, 0, 3) == "\x1f\x8b\x08" ) {2181 $i = 10;2182 $flg = ord( substr($gzData, 3, 1) );2183 if ( $flg > 0 ) {2184 if ( $flg & 4 ) {2185 list($xlen) = unpack('v', substr($gzData, $i, 2) );2186 $i = $i + 2 + $xlen;2187 }2188 if ( $flg & 8 )2189 $i = strpos($gzData, "\0", $i) + 1;2190 if ( $flg & 16 )2191 $i = strpos($gzData, "\0", $i) + 1;2192 if ( $flg & 2 )2193 $i = $i + 2;2194 }2195 $decompressed = @gzinflate( substr($gzData, $i, -8) );2196 if ( false !== $decompressed )2197 return $decompressed;2198 }2199 2200 // Compressed data from java.util.zip.Deflater amongst others.2201 $decompressed = @gzinflate( substr($gzData, 2) );2202 if ( false !== $decompressed )2203 return $decompressed;2204 2205 return false;2206 }2207 2208 /**2209 * What encoding types to accept and their priority values.2210 *2211 * @since 2.8.02212 *2213 * @static2214 *2215 * @param string $url2216 * @param array $args2217 * @return string Types of encoding to accept.2218 */2219 public static function accept_encoding( $url, $args ) {2220 $type = array();2221 $compression_enabled = self::is_available();2222 2223 if ( ! $args['decompress'] ) // Decompression specifically disabled.2224 $compression_enabled = false;2225 elseif ( $args['stream'] ) // Disable when streaming to file.2226 $compression_enabled = false;2227 elseif ( isset( $args['limit_response_size'] ) ) // If only partial content is being requested, we won't be able to decompress it.2228 $compression_enabled = false;2229 2230 if ( $compression_enabled ) {2231 if ( function_exists( 'gzinflate' ) )2232 $type[] = 'deflate;q=1.0';2233 2234 if ( function_exists( 'gzuncompress' ) )2235 $type[] = 'compress;q=0.5';2236 2237 if ( function_exists( 'gzdecode' ) )2238 $type[] = 'gzip;q=0.5';2239 }2240 2241 /**2242 * Filter the allowed encoding types.2243 *2244 * @since 3.6.02245 *2246 * @param array $type Encoding types allowed. Accepts 'gzinflate',2247 * 'gzuncompress', 'gzdecode'.2248 * @param string $url URL of the HTTP request.2249 * @param array $args HTTP request arguments.2250 */2251 $type = apply_filters( 'wp_http_accept_encoding', $type, $url, $args );2252 2253 return implode(', ', $type);2254 }2255 2256 /**2257 * What encoding the content used when it was compressed to send in the headers.2258 *2259 * @since 2.8.02260 *2261 * @static2262 *2263 * @return string Content-Encoding string to send in the header.2264 */2265 public static function content_encoding() {2266 return 'deflate';2267 }2268 2269 /**2270 * Whether the content be decoded based on the headers.2271 *2272 * @since 2.8.02273 *2274 * @static2275 *2276 * @param array|string $headers All of the available headers.2277 * @return bool2278 */2279 public static function should_decode($headers) {2280 if ( is_array( $headers ) ) {2281 if ( array_key_exists('content-encoding', $headers) && ! empty( $headers['content-encoding'] ) )2282 return true;2283 } elseif ( is_string( $headers ) ) {2284 return ( stripos($headers, 'content-encoding:') !== false );2285 }2286 2287 return false;2288 }2289 2290 /**2291 * Whether decompression and compression are supported by the PHP version.2292 *2293 * Each function is tested instead of checking for the zlib extension, to2294 * ensure that the functions all exist in the PHP version and aren't2295 * disabled.2296 *2297 * @since 2.8.02298 *2299 * @static2300 *2301 * @return bool2302 */2303 public static function is_available() {2304 return ( function_exists('gzuncompress') || function_exists('gzdeflate') || function_exists('gzinflate') );2305 }2306 }
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