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Http.php
1103 lines
| 1 | <?php |
| 2 | /** |
| 3 | * Matomo - free/libre analytics platform |
| 4 | * |
| 5 | * @link https://matomo.org |
| 6 | * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later |
| 7 | * |
| 8 | */ |
| 9 | namespace Piwik; |
| 10 | |
| 11 | use Composer\CaBundle\CaBundle; |
| 12 | use Exception; |
| 13 | use Piwik\Container\StaticContainer; |
| 14 | |
| 15 | /** |
| 16 | * Contains HTTP client related helper methods that can retrieve content from remote servers |
| 17 | * and optionally save to a local file. |
| 18 | * |
| 19 | * Used to check for the latest Piwik version and download updates. |
| 20 | * |
| 21 | */ |
| 22 | class Http |
| 23 | { |
| 24 | /** |
| 25 | * Returns the "best" available transport method for {@link sendHttpRequest()} calls. |
| 26 | * |
| 27 | * @return string|null Either curl, fopen, socket or null if no method is supported. |
| 28 | * @api |
| 29 | */ |
| 30 | public static function getTransportMethod() |
| 31 | { |
| 32 | $method = 'curl'; |
| 33 | if (!self::isCurlEnabled()) { |
| 34 | $method = 'fopen'; |
| 35 | if (@ini_get('allow_url_fopen') != '1') { |
| 36 | $method = 'socket'; |
| 37 | if (!self::isSocketEnabled()) { |
| 38 | return null; |
| 39 | } |
| 40 | } |
| 41 | } |
| 42 | return $method; |
| 43 | } |
| 44 | |
| 45 | protected static function isSocketEnabled() |
| 46 | { |
| 47 | return function_exists('fsockopen'); |
| 48 | } |
| 49 | |
| 50 | protected static function isCurlEnabled() |
| 51 | { |
| 52 | return function_exists('curl_init') && function_exists('curl_exec'); |
| 53 | } |
| 54 | |
| 55 | /** |
| 56 | * Sends an HTTP request using best available transport method. |
| 57 | * |
| 58 | * @param string $aUrl The target URL. |
| 59 | * @param int $timeout The number of seconds to wait before aborting the HTTP request. |
| 60 | * @param string|null $userAgent The user agent to use. |
| 61 | * @param string|null $destinationPath If supplied, the HTTP response will be saved to the file specified by |
| 62 | * this path. |
| 63 | * @param int|null $followDepth Internal redirect count. Should always pass `null` for this parameter. |
| 64 | * @param bool $acceptLanguage The value to use for the `'Accept-Language'` HTTP request header. |
| 65 | * @param array|bool $byteRange For `Range:` header. Should be two element array of bytes, eg, `array(0, 1024)` |
| 66 | * Doesn't work w/ `fopen` transport method. |
| 67 | * @param bool $getExtendedInfo If true returns the status code, headers & response, if false just the response. |
| 68 | * @param string $httpMethod The HTTP method to use. Defaults to `'GET'`. |
| 69 | * @param string $httpUsername HTTP Auth username |
| 70 | * @param string $httpPassword HTTP Auth password |
| 71 | * @param bool $checkHostIsAllowed whether we should check if the target host is allowed or not. This should only |
| 72 | * be set to false when using a hardcoded URL. |
| 73 | * |
| 74 | * @throws Exception if the response cannot be saved to `$destinationPath`, if the HTTP response cannot be sent, |
| 75 | * if there are more than 5 redirects or if the request times out. |
| 76 | * @return bool|string If `$destinationPath` is not specified the HTTP response is returned on success. `false` |
| 77 | * is returned on failure. |
| 78 | * If `$getExtendedInfo` is `true` and `$destinationPath` is not specified an array with |
| 79 | * the following information is returned on success: |
| 80 | * |
| 81 | * - **status**: the HTTP status code |
| 82 | * - **headers**: the HTTP headers |
| 83 | * - **data**: the HTTP response data |
| 84 | * |
| 85 | * `false` is still returned on failure. |
| 86 | * @api |
| 87 | */ |
| 88 | public static function sendHttpRequest($aUrl, |
| 89 | $timeout, |
| 90 | $userAgent = null, |
| 91 | $destinationPath = null, |
| 92 | $followDepth = 0, |
| 93 | $acceptLanguage = false, |
| 94 | $byteRange = false, |
| 95 | $getExtendedInfo = false, |
| 96 | $httpMethod = 'GET', |
| 97 | $httpUsername = null, |
| 98 | $httpPassword = null, |
| 99 | $checkHostIsAllowed = true) |
| 100 | { |
| 101 | // create output file |
| 102 | $file = self::ensureDestinationDirectoryExists($destinationPath); |
| 103 | |
| 104 | $acceptLanguage = $acceptLanguage ? 'Accept-Language: ' . $acceptLanguage : ''; |
| 105 | return self::sendHttpRequestBy(self::getTransportMethod(), $aUrl, $timeout, $userAgent, $destinationPath, $file, |
| 106 | $followDepth, $acceptLanguage, $acceptInvalidSslCertificate = false, $byteRange, $getExtendedInfo, $httpMethod, |
| 107 | $httpUsername, $httpPassword, null, [], null, $checkHostIsAllowed); |
| 108 | } |
| 109 | |
| 110 | public static function ensureDestinationDirectoryExists($destinationPath) |
| 111 | { |
| 112 | if ($destinationPath) { |
| 113 | Filesystem::mkdir(dirname($destinationPath)); |
| 114 | if (($file = @fopen($destinationPath, 'wb')) === false || !is_resource($file)) { |
| 115 | throw new Exception('Error while creating the file: ' . $destinationPath); |
| 116 | } |
| 117 | |
| 118 | return $file; |
| 119 | } |
| 120 | |
| 121 | return null; |
| 122 | } |
| 123 | |
| 124 | private static function convertWildcardToPattern($wildcardHost) |
| 125 | { |
| 126 | $flexibleStart = $flexibleEnd = false; |
| 127 | if (strpos($wildcardHost, '*.') === 0) { |
| 128 | $flexibleStart = true; |
| 129 | $wildcardHost = substr($wildcardHost, 2); |
| 130 | } |
| 131 | if (Common::stringEndsWith($wildcardHost, '.*')) { |
| 132 | $flexibleEnd = true; |
| 133 | $wildcardHost = substr($wildcardHost, 0, -2); |
| 134 | } |
| 135 | $pattern = preg_quote($wildcardHost); |
| 136 | |
| 137 | if ($flexibleStart) { |
| 138 | $pattern = '.*\.' . $pattern; |
| 139 | } |
| 140 | |
| 141 | if ($flexibleEnd) { |
| 142 | $pattern .= '\..*'; |
| 143 | } |
| 144 | |
| 145 | return '/^' . $pattern . '$/i'; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Sends an HTTP request using the specified transport method. |
| 150 | * |
| 151 | * @param string $method |
| 152 | * @param string $aUrl |
| 153 | * @param int $timeout in seconds |
| 154 | * @param string $userAgent |
| 155 | * @param string $destinationPath |
| 156 | * @param resource $file |
| 157 | * @param int $followDepth |
| 158 | * @param bool|string $acceptLanguage Accept-language header |
| 159 | * @param bool $acceptInvalidSslCertificate Only used with $method == 'curl'. If set to true (NOT recommended!) the SSL certificate will not be checked |
| 160 | * @param array|bool $byteRange For Range: header. Should be two element array of bytes, eg, array(0, 1024) |
| 161 | * Doesn't work w/ fopen method. |
| 162 | * @param bool $getExtendedInfo True to return status code, headers & response, false if just response. |
| 163 | * @param string $httpMethod The HTTP method to use. Defaults to `'GET'`. |
| 164 | * @param string $httpUsername HTTP Auth username |
| 165 | * @param string $httpPassword HTTP Auth password |
| 166 | * @param array|string $requestBody If $httpMethod is 'POST' this may accept an array of variables or a string that needs to be posted |
| 167 | * @param array $additionalHeaders List of additional headers to set for the request |
| 168 | * @param bool $checkHostIsAllowed whether we should check if the target host is allowed or not. This should only |
| 169 | * be set to false when using a hardcoded URL. |
| 170 | * |
| 171 | * @return string|array true (or string/array) on success; false on HTTP response error code (1xx or 4xx) |
| 172 | *@throws Exception |
| 173 | */ |
| 174 | public static function sendHttpRequestBy( |
| 175 | $method, |
| 176 | $aUrl, |
| 177 | $timeout, |
| 178 | $userAgent = null, |
| 179 | $destinationPath = null, |
| 180 | $file = null, |
| 181 | $followDepth = 0, |
| 182 | $acceptLanguage = false, |
| 183 | $acceptInvalidSslCertificate = false, |
| 184 | $byteRange = false, |
| 185 | $getExtendedInfo = false, |
| 186 | $httpMethod = 'GET', |
| 187 | $httpUsername = null, |
| 188 | $httpPassword = null, |
| 189 | $requestBody = null, |
| 190 | $additionalHeaders = array(), |
| 191 | $forcePost = null, |
| 192 | $checkHostIsAllowed = true |
| 193 | ) { |
| 194 | if ($followDepth > 5) { |
| 195 | throw new Exception('Too many redirects (' . $followDepth . ')'); |
| 196 | } |
| 197 | |
| 198 | $aUrl = preg_replace('/[\x00-\x1F\x7F]/', '', trim($aUrl)); |
| 199 | $parsedUrl = @parse_url($aUrl); |
| 200 | |
| 201 | if (empty($parsedUrl['scheme'])) { |
| 202 | throw new Exception('Missing scheme in given url'); |
| 203 | } |
| 204 | |
| 205 | $allowedProtocols = Config::getInstance()->General['allowed_outgoing_protocols']; |
| 206 | $isAllowed = false; |
| 207 | |
| 208 | foreach (explode(',', $allowedProtocols) as $protocol) { |
| 209 | if (strtolower($parsedUrl['scheme']) === strtolower(trim($protocol))) { |
| 210 | $isAllowed = true; |
| 211 | break; |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | if (!$isAllowed) { |
| 216 | throw new Exception(sprintf( |
| 217 | 'Protocol %s not in list of allowed protocols: %s', |
| 218 | $parsedUrl['scheme'], |
| 219 | $allowedProtocols |
| 220 | )); |
| 221 | } |
| 222 | |
| 223 | if ($checkHostIsAllowed) { |
| 224 | $disallowedHosts = StaticContainer::get('http.blocklist.hosts'); |
| 225 | |
| 226 | $isBlocked = false; |
| 227 | |
| 228 | foreach ($disallowedHosts as $host) { |
| 229 | if (preg_match(self::convertWildcardToPattern($host), $parsedUrl['host']) === 1) { |
| 230 | $isBlocked = true; |
| 231 | break; |
| 232 | } |
| 233 | } |
| 234 | |
| 235 | if ($isBlocked) { |
| 236 | throw new Exception(sprintf( |
| 237 | 'Hostname %s is in list of disallowed hosts', |
| 238 | $parsedUrl['host'] |
| 239 | )); |
| 240 | } |
| 241 | } |
| 242 | |
| 243 | $contentLength = 0; |
| 244 | $fileLength = 0; |
| 245 | |
| 246 | if ( !empty($requestBody ) && is_array($requestBody )) { |
| 247 | $requestBodyQuery = self::buildQuery($requestBody ); |
| 248 | } else { |
| 249 | $requestBodyQuery = $requestBody; |
| 250 | } |
| 251 | |
| 252 | // Piwik services behave like a proxy, so we should act like one. |
| 253 | $xff = 'X-Forwarded-For: ' |
| 254 | . (isset($_SERVER['HTTP_X_FORWARDED_FOR']) && !empty($_SERVER['HTTP_X_FORWARDED_FOR']) ? $_SERVER['HTTP_X_FORWARDED_FOR'] . ',' : '') |
| 255 | . IP::getIpFromHeader(); |
| 256 | |
| 257 | if (empty($userAgent)) { |
| 258 | $userAgent = self::getUserAgent(); |
| 259 | } |
| 260 | |
| 261 | $via = 'Via: ' |
| 262 | . (isset($_SERVER['HTTP_VIA']) && !empty($_SERVER['HTTP_VIA']) ? $_SERVER['HTTP_VIA'] . ', ' : '') |
| 263 | . Version::VERSION . ' ' |
| 264 | . ($userAgent ? " ($userAgent)" : ''); |
| 265 | |
| 266 | // range header |
| 267 | $rangeBytes = ''; |
| 268 | $rangeHeader = ''; |
| 269 | if (!empty($byteRange)) { |
| 270 | $rangeBytes = $byteRange[0] . '-' . $byteRange[1]; |
| 271 | $rangeHeader = 'Range: bytes=' . $rangeBytes . "\r\n"; |
| 272 | } |
| 273 | |
| 274 | [$proxyHost, $proxyPort, $proxyUser, $proxyPassword] = self::getProxyConfiguration($aUrl); |
| 275 | |
| 276 | // other result data |
| 277 | $status = null; |
| 278 | $headers = array(); |
| 279 | $response = null; |
| 280 | |
| 281 | $httpAuthIsUsed = !empty($httpUsername) || !empty($httpPassword); |
| 282 | |
| 283 | $httpAuth = ''; |
| 284 | if ($httpAuthIsUsed) { |
| 285 | $httpAuth = 'Authorization: Basic ' . base64_encode($httpUsername.':'.$httpPassword) . "\r\n"; |
| 286 | } |
| 287 | |
| 288 | $httpEventParams = array( |
| 289 | 'httpMethod' => $httpMethod, |
| 290 | 'body' => $requestBody, |
| 291 | 'userAgent' => $userAgent, |
| 292 | 'timeout' => $timeout, |
| 293 | 'headers' => array_map('trim', array_filter(array_merge(array( |
| 294 | $rangeHeader, $via, $xff, $httpAuth, $acceptLanguage |
| 295 | ), $additionalHeaders))), |
| 296 | 'verifySsl' => !$acceptInvalidSslCertificate, |
| 297 | 'destinationPath' => $destinationPath |
| 298 | ); |
| 299 | |
| 300 | /** |
| 301 | * Triggered to send an HTTP request. Allows plugins to resolve the HTTP request themselves or to find out |
| 302 | * when an HTTP request is triggered to log this information for example to a monitoring tool. |
| 303 | * |
| 304 | * @param string $url The URL that needs to be requested |
| 305 | * @param array $params HTTP params like |
| 306 | * - 'httpMethod' (eg GET, POST, ...), |
| 307 | * - 'body' the request body if the HTTP method needs to be posted |
| 308 | * - 'userAgent' |
| 309 | * - 'timeout' After how many seconds a request should time out |
| 310 | * - 'headers' An array of header strings like array('Accept-Language: en', '...') |
| 311 | * - 'verifySsl' A boolean whether SSL certificate should be verified |
| 312 | * - 'destinationPath' If set, the response of the HTTP request should be saved to this file |
| 313 | * @param string &$response A plugin listening to this event should assign the HTTP response it received to this variable, for example "{value: true}" |
| 314 | * @param string &$status A plugin listening to this event should assign the HTTP status code it received to this variable, for example "200" |
| 315 | * @param array &$headers A plugin listening to this event should assign the HTTP headers it received to this variable, eg array('Content-Length' => '5') |
| 316 | */ |
| 317 | Piwik::postEvent('Http.sendHttpRequest', array($aUrl, $httpEventParams, &$response, &$status, &$headers)); |
| 318 | |
| 319 | if ($response !== null || $status !== null || !empty($headers)) { |
| 320 | // was handled by event above... |
| 321 | /** |
| 322 | * described below |
| 323 | * @ignore |
| 324 | */ |
| 325 | Piwik::postEvent('Http.sendHttpRequest.end', array($aUrl, $httpEventParams, &$response, &$status, &$headers)); |
| 326 | |
| 327 | if ($destinationPath && file_exists($destinationPath)) { |
| 328 | return true; |
| 329 | } |
| 330 | if ($getExtendedInfo) { |
| 331 | return array( |
| 332 | 'status' => $status, |
| 333 | 'headers' => $headers, |
| 334 | 'data' => $response |
| 335 | ); |
| 336 | } else { |
| 337 | return trim($response); |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | if ($method == 'socket') { |
| 342 | if (!self::isSocketEnabled()) { |
| 343 | // can be triggered in tests |
| 344 | throw new Exception("HTTP socket support is not enabled (php function fsockopen is not available) "); |
| 345 | } |
| 346 | // initialization |
| 347 | $url = @parse_url($aUrl); |
| 348 | if ($url === false || !isset($url['scheme'])) { |
| 349 | throw new Exception('Malformed URL: ' . $aUrl); |
| 350 | } |
| 351 | |
| 352 | if ($url['scheme'] != 'http' && $url['scheme'] != 'https') { |
| 353 | throw new Exception('Invalid protocol/scheme: ' . $url['scheme']); |
| 354 | } |
| 355 | $host = $url['host']; |
| 356 | $port = isset($url['port']) ? $url['port'] : ('https' == $url['scheme'] ? 443 : 80); |
| 357 | $path = isset($url['path']) ? $url['path'] : '/'; |
| 358 | if (isset($url['query'])) { |
| 359 | $path .= '?' . $url['query']; |
| 360 | } |
| 361 | $errno = null; |
| 362 | $errstr = null; |
| 363 | |
| 364 | if ((!empty($proxyHost) && !empty($proxyPort)) |
| 365 | || !empty($byteRange) |
| 366 | ) { |
| 367 | $httpVer = '1.1'; |
| 368 | } else { |
| 369 | $httpVer = '1.0'; |
| 370 | } |
| 371 | |
| 372 | $proxyAuth = null; |
| 373 | if (!empty($proxyHost) && !empty($proxyPort)) { |
| 374 | $connectHost = $proxyHost; |
| 375 | $connectPort = $proxyPort; |
| 376 | if (!empty($proxyUser) && !empty($proxyPassword)) { |
| 377 | $proxyAuth = 'Proxy-Authorization: Basic ' . base64_encode("$proxyUser:$proxyPassword") . "\r\n"; |
| 378 | } |
| 379 | $requestHeader = "$httpMethod $aUrl HTTP/$httpVer\r\n"; |
| 380 | } else { |
| 381 | $connectHost = $host; |
| 382 | $connectPort = $port; |
| 383 | $requestHeader = "$httpMethod $path HTTP/$httpVer\r\n"; |
| 384 | |
| 385 | if ('https' == $url['scheme']) { |
| 386 | $connectHost = 'ssl://' . $connectHost; |
| 387 | } |
| 388 | } |
| 389 | |
| 390 | // connection attempt |
| 391 | if (($fsock = @fsockopen($connectHost, $connectPort, $errno, $errstr, $timeout)) === false || !is_resource($fsock)) { |
| 392 | if (is_resource($file)) { |
| 393 | @fclose($file); |
| 394 | } |
| 395 | throw new Exception("Error while connecting to: $host. Please try again later. $errstr"); |
| 396 | } |
| 397 | |
| 398 | // send HTTP request header |
| 399 | $requestHeader .= |
| 400 | "Host: $host" . ($port != 80 && ('https' == $url['scheme'] && $port != 443) ? ':' . $port : '') . "\r\n" |
| 401 | . ($httpAuth ? $httpAuth : '') |
| 402 | . ($proxyAuth ? $proxyAuth : '') |
| 403 | . 'User-Agent: ' . $userAgent . "\r\n" |
| 404 | . ($acceptLanguage ? $acceptLanguage . "\r\n" : '') |
| 405 | . $xff . "\r\n" |
| 406 | . $via . "\r\n" |
| 407 | . $rangeHeader |
| 408 | . (!empty($additionalHeaders) ? implode("\r\n", $additionalHeaders) . "\r\n" : '') |
| 409 | . "Connection: close\r\n"; |
| 410 | fwrite($fsock, $requestHeader); |
| 411 | |
| 412 | if (strtolower($httpMethod) === 'post' && !empty($requestBodyQuery )) { |
| 413 | fwrite($fsock, self::buildHeadersForPost($requestBodyQuery )); |
| 414 | fwrite($fsock, "\r\n"); |
| 415 | fwrite($fsock, $requestBodyQuery ); |
| 416 | } else { |
| 417 | fwrite($fsock, "\r\n"); |
| 418 | } |
| 419 | |
| 420 | $streamMetaData = array('timed_out' => false); |
| 421 | @stream_set_blocking($fsock, true); |
| 422 | |
| 423 | if (function_exists('stream_set_timeout')) { |
| 424 | @stream_set_timeout($fsock, $timeout); |
| 425 | } elseif (function_exists('socket_set_timeout')) { |
| 426 | @socket_set_timeout($fsock, $timeout); |
| 427 | } |
| 428 | |
| 429 | // process header |
| 430 | $status = null; |
| 431 | |
| 432 | while (!feof($fsock)) { |
| 433 | $line = fgets($fsock, 4096); |
| 434 | |
| 435 | $streamMetaData = @stream_get_meta_data($fsock); |
| 436 | if ($streamMetaData['timed_out']) { |
| 437 | if (is_resource($file)) { |
| 438 | @fclose($file); |
| 439 | } |
| 440 | @fclose($fsock); |
| 441 | throw new Exception('Timed out waiting for server response'); |
| 442 | } |
| 443 | |
| 444 | // a blank line marks the end of the server response header |
| 445 | if (rtrim($line, "\r\n") == '') { |
| 446 | break; |
| 447 | } |
| 448 | |
| 449 | // parse first line of server response header |
| 450 | if (!$status) { |
| 451 | // expect first line to be HTTP response status line, e.g., HTTP/1.1 200 OK |
| 452 | if (!preg_match('~^HTTP/(\d\.\d)\s+(\d+)(\s*.*)?~', $line, $m)) { |
| 453 | if (is_resource($file)) { |
| 454 | @fclose($file); |
| 455 | } |
| 456 | @fclose($fsock); |
| 457 | throw new Exception('Expected server response code. Got ' . rtrim($line, "\r\n")); |
| 458 | } |
| 459 | |
| 460 | $status = (integer)$m[2]; |
| 461 | |
| 462 | // Informational 1xx or Client Error 4xx |
| 463 | if ($status < 200 || $status >= 400) { |
| 464 | if (is_resource($file)) { |
| 465 | @fclose($file); |
| 466 | } |
| 467 | @fclose($fsock); |
| 468 | |
| 469 | if (!$getExtendedInfo) { |
| 470 | return false; |
| 471 | } else { |
| 472 | return array('status' => $status); |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | continue; |
| 477 | } |
| 478 | |
| 479 | // handle redirect |
| 480 | if (preg_match('/^Location:\s*(.+)/', rtrim($line, "\r\n"), $m)) { |
| 481 | if (is_resource($file)) { |
| 482 | @fclose($file); |
| 483 | } |
| 484 | @fclose($fsock); |
| 485 | // Successful 2xx vs Redirect 3xx |
| 486 | if ($status < 300) { |
| 487 | throw new Exception('Unexpected redirect to Location: ' . rtrim($line) . ' for status code ' . $status); |
| 488 | } |
| 489 | return self::sendHttpRequestBy( |
| 490 | $method, |
| 491 | trim($m[1]), |
| 492 | $timeout, |
| 493 | $userAgent, |
| 494 | $destinationPath, |
| 495 | $file, |
| 496 | $followDepth + 1, |
| 497 | $acceptLanguage, |
| 498 | $acceptInvalidSslCertificate = false, |
| 499 | $byteRange, |
| 500 | $getExtendedInfo, |
| 501 | $httpMethod, |
| 502 | $httpUsername, |
| 503 | $httpPassword, |
| 504 | $requestBodyQuery, |
| 505 | $additionalHeaders |
| 506 | ); |
| 507 | } |
| 508 | |
| 509 | // save expected content length for later verification |
| 510 | if (preg_match('/^Content-Length:\s*(\d+)/', $line, $m)) { |
| 511 | $contentLength = (integer)$m[1]; |
| 512 | } |
| 513 | |
| 514 | self::parseHeaderLine($headers, $line); |
| 515 | } |
| 516 | |
| 517 | if (feof($fsock) |
| 518 | && $httpMethod != 'HEAD' |
| 519 | ) { |
| 520 | throw new Exception('Unexpected end of transmission'); |
| 521 | } |
| 522 | |
| 523 | // process content/body |
| 524 | $response = ''; |
| 525 | |
| 526 | while (!feof($fsock)) { |
| 527 | $line = fread($fsock, 8192); |
| 528 | |
| 529 | $streamMetaData = @stream_get_meta_data($fsock); |
| 530 | if ($streamMetaData['timed_out']) { |
| 531 | if (is_resource($file)) { |
| 532 | @fclose($file); |
| 533 | } |
| 534 | @fclose($fsock); |
| 535 | throw new Exception('Timed out waiting for server response'); |
| 536 | } |
| 537 | |
| 538 | $fileLength += strlen($line); |
| 539 | |
| 540 | if (is_resource($file)) { |
| 541 | // save to file |
| 542 | fwrite($file, $line); |
| 543 | } else { |
| 544 | // concatenate to response string |
| 545 | $response .= $line; |
| 546 | } |
| 547 | } |
| 548 | |
| 549 | // determine success or failure |
| 550 | @fclose(@$fsock); |
| 551 | } elseif ($method == 'fopen') { |
| 552 | $response = false; |
| 553 | |
| 554 | // we make sure the request takes less than a few seconds to fail |
| 555 | // we create a stream_context (works in php >= 5.2.1) |
| 556 | // we also set the socket_timeout (for php < 5.2.1) |
| 557 | $default_socket_timeout = @ini_get('default_socket_timeout'); |
| 558 | @ini_set('default_socket_timeout', $timeout); |
| 559 | |
| 560 | $ctx = null; |
| 561 | if (function_exists('stream_context_create')) { |
| 562 | $stream_options = array( |
| 563 | 'http' => array( |
| 564 | 'header' => 'User-Agent: ' . $userAgent . "\r\n" |
| 565 | . ($httpAuth ? $httpAuth : '') |
| 566 | . ($acceptLanguage ? $acceptLanguage . "\r\n" : '') |
| 567 | . $xff . "\r\n" |
| 568 | . $via . "\r\n" |
| 569 | . (!empty($additionalHeaders) ? implode("\r\n", $additionalHeaders) . "\r\n" : '') |
| 570 | . $rangeHeader, |
| 571 | 'max_redirects' => 5, // PHP 5.1.0 |
| 572 | 'timeout' => $timeout, // PHP 5.2.1 |
| 573 | ) |
| 574 | ); |
| 575 | |
| 576 | if (!empty($proxyHost) && !empty($proxyPort)) { |
| 577 | $stream_options['http']['proxy'] = 'tcp://' . $proxyHost . ':' . $proxyPort; |
| 578 | $stream_options['http']['request_fulluri'] = true; // required by squid proxy |
| 579 | if (!empty($proxyUser) && !empty($proxyPassword)) { |
| 580 | $stream_options['http']['header'] .= 'Proxy-Authorization: Basic ' . base64_encode("$proxyUser:$proxyPassword") . "\r\n"; |
| 581 | } |
| 582 | } |
| 583 | |
| 584 | if (strtolower($httpMethod) === 'post' && !empty($requestBodyQuery )) { |
| 585 | $postHeader = self::buildHeadersForPost($requestBodyQuery ); |
| 586 | $postHeader .= "\r\n"; |
| 587 | $stream_options['http']['method'] = 'POST'; |
| 588 | $stream_options['http']['header'] .= $postHeader; |
| 589 | $stream_options['http']['content'] = $requestBodyQuery; |
| 590 | } |
| 591 | |
| 592 | $ctx = stream_context_create($stream_options); |
| 593 | } |
| 594 | |
| 595 | // save to file |
| 596 | if (is_resource($file)) { |
| 597 | if (!($handle = fopen($aUrl, 'rb', false, $ctx))) { |
| 598 | throw new Exception("Unable to open $aUrl"); |
| 599 | } |
| 600 | while (!feof($handle)) { |
| 601 | $response = fread($handle, 8192); |
| 602 | $fileLength += strlen($response); |
| 603 | fwrite($file, $response); |
| 604 | } |
| 605 | fclose($handle); |
| 606 | } else { |
| 607 | $response = @file_get_contents($aUrl, 0, $ctx); |
| 608 | |
| 609 | // try to get http status code from response headers |
| 610 | if (isset($http_response_header) && preg_match('~^HTTP/(\d\.\d)\s+(\d+)(\s*.*)?~', implode("\n", $http_response_header), $m)) { |
| 611 | $status = (int)$m[2]; |
| 612 | } |
| 613 | |
| 614 | if (!$status && $response === false) { |
| 615 | $error = ErrorHandler::getLastError(); |
| 616 | throw new \Exception($error); |
| 617 | } |
| 618 | $fileLength = strlen($response); |
| 619 | } |
| 620 | |
| 621 | foreach ($http_response_header as $line) { |
| 622 | self::parseHeaderLine($headers, $line); |
| 623 | } |
| 624 | |
| 625 | // restore the socket_timeout value |
| 626 | if (!empty($default_socket_timeout)) { |
| 627 | @ini_set('default_socket_timeout', $default_socket_timeout); |
| 628 | } |
| 629 | } elseif ($method == 'curl') { |
| 630 | if (!self::isCurlEnabled()) { |
| 631 | // can be triggered in tests |
| 632 | throw new Exception("CURL is not enabled in php.ini, but is being used."); |
| 633 | } |
| 634 | $ch = @curl_init(); |
| 635 | |
| 636 | if (!empty($proxyHost) && !empty($proxyPort)) { |
| 637 | @curl_setopt($ch, CURLOPT_PROXY, $proxyHost . ':' . $proxyPort); |
| 638 | if (!empty($proxyUser) && !empty($proxyPassword)) { |
| 639 | // PROXYAUTH defaults to BASIC |
| 640 | @curl_setopt($ch, CURLOPT_PROXYUSERPWD, $proxyUser . ':' . $proxyPassword); |
| 641 | } |
| 642 | } |
| 643 | |
| 644 | $curl_options = array( |
| 645 | // internal to ext/curl |
| 646 | CURLOPT_BINARYTRANSFER => is_resource($file), |
| 647 | |
| 648 | // curl options (sorted oldest to newest) |
| 649 | CURLOPT_URL => $aUrl, |
| 650 | CURLOPT_USERAGENT => $userAgent, |
| 651 | CURLOPT_HTTPHEADER => array_merge(array( |
| 652 | $xff, |
| 653 | $via, |
| 654 | $acceptLanguage |
| 655 | ), $additionalHeaders), |
| 656 | // only get header info if not saving directly to file |
| 657 | CURLOPT_HEADER => is_resource($file) ? false : true, |
| 658 | CURLOPT_CONNECTTIMEOUT => $timeout, |
| 659 | CURLOPT_TIMEOUT => $timeout, |
| 660 | ); |
| 661 | |
| 662 | if ($rangeBytes) { |
| 663 | curl_setopt($ch, CURLOPT_RANGE, $rangeBytes); |
| 664 | } else { |
| 665 | // see https://github.com/matomo-org/matomo/pull/17009 for more info |
| 666 | // NOTE: we only do this when CURLOPT_RANGE is not being used, because when using both the |
| 667 | // response is empty. |
| 668 | $curl_options[CURLOPT_ENCODING] = ""; |
| 669 | } |
| 670 | |
| 671 | // Case core:archive command is triggering archiving on https:// and the certificate is not valid |
| 672 | if ($acceptInvalidSslCertificate) { |
| 673 | $curl_options += array( |
| 674 | CURLOPT_SSL_VERIFYHOST => false, |
| 675 | CURLOPT_SSL_VERIFYPEER => false, |
| 676 | ); |
| 677 | } |
| 678 | @curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $httpMethod); |
| 679 | if ($httpMethod == 'HEAD') { |
| 680 | @curl_setopt($ch, CURLOPT_NOBODY, true); |
| 681 | } |
| 682 | |
| 683 | if (strtolower($httpMethod) === 'post' && !empty($requestBodyQuery )) { |
| 684 | curl_setopt($ch, CURLOPT_POST, 1); |
| 685 | curl_setopt($ch, CURLOPT_POSTFIELDS, $requestBodyQuery ); |
| 686 | } |
| 687 | |
| 688 | if (!empty($httpUsername) && !empty($httpPassword)) { |
| 689 | $curl_options += array( |
| 690 | CURLOPT_USERPWD => $httpUsername . ':' . $httpPassword, |
| 691 | ); |
| 692 | } |
| 693 | |
| 694 | @curl_setopt_array($ch, $curl_options); |
| 695 | self::configCurlCertificate($ch); |
| 696 | |
| 697 | /* |
| 698 | * as of php 5.2.0, CURLOPT_FOLLOWLOCATION can't be set if |
| 699 | * in safe_mode or open_basedir is set |
| 700 | */ |
| 701 | if ((string)ini_get('safe_mode') == '' && ini_get('open_basedir') == '') { |
| 702 | $protocols = 0; |
| 703 | |
| 704 | foreach (explode(',', $allowedProtocols) as $protocol) { |
| 705 | if (defined('CURLPROTO_' . strtoupper(trim($protocol)))) { |
| 706 | $protocols |= constant('CURLPROTO_' . strtoupper(trim($protocol))); |
| 707 | } |
| 708 | } |
| 709 | |
| 710 | $curl_options = array( |
| 711 | // curl options (sorted oldest to newest) |
| 712 | CURLOPT_FOLLOWLOCATION => true, |
| 713 | CURLOPT_REDIR_PROTOCOLS => $protocols, |
| 714 | CURLOPT_MAXREDIRS => 5, |
| 715 | ); |
| 716 | if ($forcePost) { |
| 717 | $curl_options[CURLOPT_POSTREDIR] = CURL_REDIR_POST_ALL; |
| 718 | } |
| 719 | @curl_setopt_array($ch, $curl_options); |
| 720 | } |
| 721 | |
| 722 | if (is_resource($file)) { |
| 723 | // write output directly to file |
| 724 | @curl_setopt($ch, CURLOPT_FILE, $file); |
| 725 | } else { |
| 726 | // internal to ext/curl |
| 727 | @curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); |
| 728 | } |
| 729 | |
| 730 | ob_start(); |
| 731 | $response = @curl_exec($ch); |
| 732 | ob_end_clean(); |
| 733 | |
| 734 | if ($response === true) { |
| 735 | $response = ''; |
| 736 | } elseif ($response === false) { |
| 737 | $errstr = curl_error($ch); |
| 738 | if ($errstr != '') { |
| 739 | throw new Exception('curl_exec: ' . $errstr |
| 740 | . '. Hostname requested was: ' . UrlHelper::getHostFromUrl($aUrl)); |
| 741 | } |
| 742 | $response = ''; |
| 743 | } else { |
| 744 | $header = ''; |
| 745 | // redirects are included in the output html, so we look for the last line that starts w/ HTTP/... |
| 746 | // to split the response |
| 747 | while (substr($response, 0, 5) == "HTTP/") { |
| 748 | $split = explode("\r\n\r\n", $response, 2); |
| 749 | |
| 750 | if(count($split) == 2) { |
| 751 | [$header, $response] = $split; |
| 752 | } else { |
| 753 | $response = ''; |
| 754 | $header = $split; |
| 755 | } |
| 756 | } |
| 757 | |
| 758 | foreach (explode("\r\n", $header) as $line) { |
| 759 | self::parseHeaderLine($headers, $line); |
| 760 | } |
| 761 | } |
| 762 | |
| 763 | $contentLength = @curl_getinfo($ch, CURLINFO_CONTENT_LENGTH_DOWNLOAD); |
| 764 | $fileLength = is_resource($file) ? @curl_getinfo($ch, CURLINFO_SIZE_DOWNLOAD) : strlen($response); |
| 765 | $status = @curl_getinfo($ch, CURLINFO_HTTP_CODE); |
| 766 | |
| 767 | @curl_close($ch); |
| 768 | unset($ch); |
| 769 | } else { |
| 770 | throw new Exception('Invalid request method: ' . $method); |
| 771 | } |
| 772 | |
| 773 | if (is_resource($file)) { |
| 774 | fflush($file); |
| 775 | @fclose($file); |
| 776 | |
| 777 | $fileSize = filesize($destinationPath); |
| 778 | if ($contentLength > 0 |
| 779 | && $fileSize != $contentLength |
| 780 | ) { |
| 781 | throw new Exception('File size error: ' . $destinationPath . '; expected ' . $contentLength . ' bytes; received ' . $fileLength . ' bytes; saved ' . $fileSize . ' bytes to file'); |
| 782 | } |
| 783 | return true; |
| 784 | } |
| 785 | |
| 786 | /** |
| 787 | * Triggered when an HTTP request finished. A plugin can for example listen to this and alter the response, |
| 788 | * status code, or finish a timer in case the plugin is measuring how long it took to execute the request |
| 789 | * |
| 790 | * @param string $url The URL that needs to be requested |
| 791 | * @param array $params HTTP params like |
| 792 | * - 'httpMethod' (eg GET, POST, ...), |
| 793 | * - 'body' the request body if the HTTP method needs to be posted |
| 794 | * - 'userAgent' |
| 795 | * - 'timeout' After how many seconds a request should time out |
| 796 | * - 'headers' An array of header strings like array('Accept-Language: en', '...') |
| 797 | * - 'verifySsl' A boolean whether SSL certificate should be verified |
| 798 | * - 'destinationPath' If set, the response of the HTTP request should be saved to this file |
| 799 | * @param string &$response The response of the HTTP request, for example "{value: true}" |
| 800 | * @param string &$status The returned HTTP status code, for example "200" |
| 801 | * @param array &$headers The returned headers, eg array('Content-Length' => '5') |
| 802 | */ |
| 803 | Piwik::postEvent('Http.sendHttpRequest.end', array($aUrl, $httpEventParams, &$response, &$status, &$headers)); |
| 804 | |
| 805 | if (!$getExtendedInfo) { |
| 806 | return trim($response); |
| 807 | } else { |
| 808 | return array( |
| 809 | 'status' => $status, |
| 810 | 'headers' => $headers, |
| 811 | 'data' => $response |
| 812 | ); |
| 813 | } |
| 814 | } |
| 815 | |
| 816 | public static function buildQuery($params) |
| 817 | { |
| 818 | return http_build_query($params, '', '&'); |
| 819 | } |
| 820 | |
| 821 | private static function buildHeadersForPost($requestBody) |
| 822 | { |
| 823 | $postHeader = "Content-Type: application/x-www-form-urlencoded\r\n"; |
| 824 | $postHeader .= "Content-Length: " . strlen($requestBody) . "\r\n"; |
| 825 | |
| 826 | return $postHeader; |
| 827 | } |
| 828 | |
| 829 | /** |
| 830 | * Downloads the next chunk of a specific file. The next chunk's byte range |
| 831 | * is determined by the existing file's size and the expected file size, which |
| 832 | * is stored in the option table before starting a download. The expected |
| 833 | * file size is obtained through a `HEAD` HTTP request. |
| 834 | * |
| 835 | * _Note: this function uses the **Range** HTTP header to accomplish downloading in |
| 836 | * parts. Not every server supports this header._ |
| 837 | * |
| 838 | * The proper use of this function is to call it once per request. The browser |
| 839 | * should continue to send requests to Piwik which will in turn call this method |
| 840 | * until the file has completely downloaded. In this way, the user can be informed |
| 841 | * of a download's progress. |
| 842 | * |
| 843 | * **Example Usage** |
| 844 | * |
| 845 | * ``` |
| 846 | * // browser JavaScript |
| 847 | * var downloadFile = function (isStart) { |
| 848 | * var ajax = new ajaxHelper(); |
| 849 | * ajax.addParams({ |
| 850 | * module: 'MyPlugin', |
| 851 | * action: 'myAction', |
| 852 | * isStart: isStart ? 1 : 0 |
| 853 | * }, 'post'); |
| 854 | * ajax.setCallback(function (response) { |
| 855 | * var progress = response.progress |
| 856 | * // ...update progress... |
| 857 | * |
| 858 | * downloadFile(false); |
| 859 | * }); |
| 860 | * ajax.send(); |
| 861 | * } |
| 862 | * |
| 863 | * downloadFile(true); |
| 864 | * ``` |
| 865 | * |
| 866 | * ``` |
| 867 | * // PHP controller action |
| 868 | * public function myAction() |
| 869 | * { |
| 870 | * $outputPath = PIWIK_INCLUDE_PATH . '/tmp/averybigfile.zip'; |
| 871 | * $isStart = Common::getRequestVar('isStart', 1, 'int'); |
| 872 | * Http::downloadChunk("http://bigfiles.com/averybigfile.zip", $outputPath, $isStart == 1); |
| 873 | * } |
| 874 | * ``` |
| 875 | * |
| 876 | * @param string $url The url to download from. |
| 877 | * @param string $outputPath The path to the file to save/append to. |
| 878 | * @param bool $isContinuation `true` if this is the continuation of a download, |
| 879 | * or if we're starting a fresh one. |
| 880 | * @throws Exception if the file already exists and we're starting a new download, |
| 881 | * if we're trying to continue a download that never started |
| 882 | * @return array |
| 883 | * @api |
| 884 | */ |
| 885 | public static function downloadChunk($url, $outputPath, $isContinuation) |
| 886 | { |
| 887 | // make sure file doesn't already exist if we're starting a new download |
| 888 | if (!$isContinuation |
| 889 | && file_exists($outputPath) |
| 890 | ) { |
| 891 | throw new Exception( |
| 892 | Piwik::translate('General_DownloadFail_FileExists', "'" . $outputPath . "'") |
| 893 | . ' ' . Piwik::translate('General_DownloadPleaseRemoveExisting')); |
| 894 | } |
| 895 | |
| 896 | // if we're starting a download, get the expected file size & save as an option |
| 897 | $downloadOption = $outputPath . '_expectedDownloadSize'; |
| 898 | if (!$isContinuation) { |
| 899 | $expectedFileSizeResult = Http::sendHttpRequest( |
| 900 | $url, |
| 901 | $timeout = 300, |
| 902 | $userAgent = null, |
| 903 | $destinationPath = null, |
| 904 | $followDepth = 0, |
| 905 | $acceptLanguage = false, |
| 906 | $byteRange = false, |
| 907 | $getExtendedInfo = true, |
| 908 | $httpMethod = 'HEAD' |
| 909 | ); |
| 910 | |
| 911 | $expectedFileSize = 0; |
| 912 | if (isset($expectedFileSizeResult['headers']['Content-Length'])) { |
| 913 | $expectedFileSize = (int)$expectedFileSizeResult['headers']['Content-Length']; |
| 914 | } |
| 915 | |
| 916 | if ($expectedFileSize == 0) { |
| 917 | Log::info("HEAD request for '%s' failed, got following: %s", $url, print_r($expectedFileSizeResult, true)); |
| 918 | throw new Exception(Piwik::translate('General_DownloadFail_HttpRequestFail')); |
| 919 | } |
| 920 | |
| 921 | Option::set($downloadOption, $expectedFileSize); |
| 922 | } else { |
| 923 | $expectedFileSize = (int)Option::get($downloadOption); |
| 924 | if ($expectedFileSize === false) { // sanity check |
| 925 | throw new Exception("Trying to continue a download that never started?! That's not supposed to happen..."); |
| 926 | } |
| 927 | } |
| 928 | |
| 929 | // if existing file is already big enough, then fail so we don't accidentally overwrite |
| 930 | // existing DB |
| 931 | $existingSize = file_exists($outputPath) ? filesize($outputPath) : 0; |
| 932 | if ($existingSize >= $expectedFileSize) { |
| 933 | throw new Exception( |
| 934 | Piwik::translate('General_DownloadFail_FileExistsContinue', "'" . $outputPath . "'") |
| 935 | . ' ' . Piwik::translate('General_DownloadPleaseRemoveExisting')); |
| 936 | } |
| 937 | |
| 938 | // download a chunk of the file |
| 939 | $result = Http::sendHttpRequest( |
| 940 | $url, |
| 941 | $timeout = 300, |
| 942 | $userAgent = null, |
| 943 | $destinationPath = null, |
| 944 | $followDepth = 0, |
| 945 | $acceptLanguage = false, |
| 946 | $byteRange = array($existingSize, min($existingSize + 1024 * 1024 - 1, $expectedFileSize)), |
| 947 | $getExtendedInfo = true |
| 948 | ); |
| 949 | |
| 950 | if ($result === false |
| 951 | || $result['status'] < 200 |
| 952 | || $result['status'] > 299 |
| 953 | ) { |
| 954 | $result['data'] = self::truncateStr($result['data'], 1024); |
| 955 | Log::info("Failed to download range '%s-%s' of file from url '%s'. Got result: %s", |
| 956 | $byteRange[0], $byteRange[1], $url, print_r($result, true)); |
| 957 | |
| 958 | throw new Exception(Piwik::translate('General_DownloadFail_HttpRequestFail')); |
| 959 | } |
| 960 | |
| 961 | // write chunk to file |
| 962 | $f = fopen($outputPath, 'ab'); |
| 963 | fwrite($f, $result['data']); |
| 964 | fclose($f); |
| 965 | |
| 966 | clearstatcache($clear_realpath_cache = true, $outputPath); |
| 967 | return array( |
| 968 | 'current_size' => filesize($outputPath), |
| 969 | 'expected_file_size' => $expectedFileSize, |
| 970 | ); |
| 971 | } |
| 972 | |
| 973 | /** |
| 974 | * Will configure CURL handle $ch |
| 975 | * to use local list of Certificate Authorities, |
| 976 | */ |
| 977 | public static function configCurlCertificate(&$ch) |
| 978 | { |
| 979 | $general = Config::getInstance()->General; |
| 980 | if (!empty($general['custom_cacert_pem'])) { |
| 981 | $cacertPath = $general['custom_cacert_pem']; |
| 982 | } else { |
| 983 | $cacertPath = CaBundle::getBundledCaBundlePath(); |
| 984 | } |
| 985 | @curl_setopt($ch, CURLOPT_CAINFO, $cacertPath); |
| 986 | } |
| 987 | |
| 988 | public static function getUserAgent() |
| 989 | { |
| 990 | return !empty($_SERVER['HTTP_USER_AGENT']) |
| 991 | ? $_SERVER['HTTP_USER_AGENT'] |
| 992 | : 'Matomo/' . Version::VERSION; |
| 993 | } |
| 994 | |
| 995 | /** |
| 996 | * Fetches a file located at `$url` and saves it to `$destinationPath`. |
| 997 | * |
| 998 | * @param string $url The URL of the file to download. |
| 999 | * @param string $destinationPath The path to download the file to. |
| 1000 | * @param int $tries (deprecated) |
| 1001 | * @param int $timeout The amount of seconds to wait before aborting the HTTP request. |
| 1002 | * @throws Exception if the response cannot be saved to `$destinationPath`, if the HTTP response cannot be sent, |
| 1003 | * if there are more than 5 redirects or if the request times out. |
| 1004 | * @return bool `true` on success, throws Exception on failure |
| 1005 | * @api |
| 1006 | */ |
| 1007 | public static function fetchRemoteFile($url, $destinationPath = null, $tries = 0, $timeout = 10) |
| 1008 | { |
| 1009 | @ignore_user_abort(true); |
| 1010 | SettingsServer::setMaxExecutionTime(0); |
| 1011 | return self::sendHttpRequest($url, $timeout, 'Update', $destinationPath); |
| 1012 | } |
| 1013 | |
| 1014 | /** |
| 1015 | * Utility function, parses an HTTP header line into key/value & sets header |
| 1016 | * array with them. |
| 1017 | * |
| 1018 | * @param array $headers |
| 1019 | * @param string $line |
| 1020 | */ |
| 1021 | private static function parseHeaderLine(&$headers, $line) |
| 1022 | { |
| 1023 | $parts = explode(':', $line, 2); |
| 1024 | if (count($parts) == 1) { |
| 1025 | return; |
| 1026 | } |
| 1027 | |
| 1028 | [$name, $value] = $parts; |
| 1029 | $name = trim($name); |
| 1030 | $headers[$name] = trim($value); |
| 1031 | |
| 1032 | /** |
| 1033 | * With HTTP/2 Cloudflare is passing headers in lowercase (e.g. 'content-type' instead of 'Content-Type') |
| 1034 | * which breaks any code which uses the header data. |
| 1035 | */ |
| 1036 | if (version_compare(PHP_VERSION, '5.5.16', '>=')) { |
| 1037 | // Passing a second arg to ucwords is not supported by older versions of PHP |
| 1038 | $camelName = ucwords($name, '-'); |
| 1039 | if ($camelName !== $name) { |
| 1040 | $headers[$camelName] = trim($value); |
| 1041 | } |
| 1042 | } |
| 1043 | } |
| 1044 | |
| 1045 | /** |
| 1046 | * Utility function that truncates a string to an arbitrary limit. |
| 1047 | * |
| 1048 | * @param string $str The string to truncate. |
| 1049 | * @param int $limit The maximum length of the truncated string. |
| 1050 | * @return string |
| 1051 | */ |
| 1052 | private static function truncateStr($str, $limit) |
| 1053 | { |
| 1054 | if (strlen($str) > $limit) { |
| 1055 | return substr($str, 0, $limit) . '...'; |
| 1056 | } |
| 1057 | return $str; |
| 1058 | } |
| 1059 | |
| 1060 | /** |
| 1061 | * Returns the If-Modified-Since HTTP header if it can be found. If it cannot be |
| 1062 | * found, an empty string is returned. |
| 1063 | * |
| 1064 | * @return string |
| 1065 | */ |
| 1066 | public static function getModifiedSinceHeader() |
| 1067 | { |
| 1068 | $modifiedSince = ''; |
| 1069 | if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) { |
| 1070 | $modifiedSince = $_SERVER['HTTP_IF_MODIFIED_SINCE']; |
| 1071 | |
| 1072 | // strip any trailing data appended to header |
| 1073 | if (false !== ($semicolonPos = strpos($modifiedSince, ';'))) { |
| 1074 | $modifiedSince = substr($modifiedSince, 0, $semicolonPos); |
| 1075 | } |
| 1076 | } |
| 1077 | return $modifiedSince; |
| 1078 | } |
| 1079 | |
| 1080 | /** |
| 1081 | * Returns Proxy to use for connecting via HTTP to given URL |
| 1082 | * |
| 1083 | * @param string $url |
| 1084 | * @return array |
| 1085 | */ |
| 1086 | private static function getProxyConfiguration($url) |
| 1087 | { |
| 1088 | $hostname = UrlHelper::getHostFromUrl($url); |
| 1089 | |
| 1090 | if (Url::isLocalHost($hostname)) { |
| 1091 | return array(null, null, null, null); |
| 1092 | } |
| 1093 | |
| 1094 | // proxy configuration |
| 1095 | $proxyHost = Config::getInstance()->proxy['host']; |
| 1096 | $proxyPort = Config::getInstance()->proxy['port']; |
| 1097 | $proxyUser = Config::getInstance()->proxy['username']; |
| 1098 | $proxyPassword = Config::getInstance()->proxy['password']; |
| 1099 | |
| 1100 | return array($proxyHost, $proxyPort, $proxyUser, $proxyPassword); |
| 1101 | } |
| 1102 | } |
| 1103 |