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ProxyHttp.php
256 lines
| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * Matomo - free/libre analytics platform |
| 5 | * |
| 6 | * @link https://matomo.org |
| 7 | * @license https://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later |
| 8 | */ |
| 9 | namespace Piwik; |
| 10 | |
| 11 | /** |
| 12 | * Http helper: static file server proxy, with compression, caching, isHttps() helper... |
| 13 | * |
| 14 | * Used to server piwik.js and the merged+minified CSS and JS files |
| 15 | * |
| 16 | */ |
| 17 | class ProxyHttp |
| 18 | { |
| 19 | public const DEFLATE_ENCODING_REGEX = '/(?:^|, ?)(deflate)(?:,|$)/'; |
| 20 | public const GZIP_ENCODING_REGEX = '/(?:^|, ?)((x-)?gzip)(?:,|$)/'; |
| 21 | /** |
| 22 | * Returns true if the current request appears to be a secure HTTPS connection |
| 23 | * |
| 24 | * @return bool |
| 25 | */ |
| 26 | public static function isHttps() |
| 27 | { |
| 28 | return \Piwik\Url::getCurrentScheme() === 'https'; |
| 29 | } |
| 30 | /** |
| 31 | * Serve static files through php proxy. |
| 32 | * |
| 33 | * It performs the following actions: |
| 34 | * - Checks the file is readable or returns "HTTP/1.0 404 Not Found" |
| 35 | * - Returns "HTTP/1.1 304 Not Modified" after comparing the HTTP_IF_MODIFIED_SINCE |
| 36 | * with the modification date of the static file |
| 37 | * - Will try to compress the static file according to HTTP_ACCEPT_ENCODING. Compressed files are store in |
| 38 | * the /tmp directory. If compressing extensions are not available, a manually gzip compressed file |
| 39 | * can be provided in the /tmp directory. It has to bear the same name with an added .gz extension. |
| 40 | * Using manually compressed static files requires you to manually update the compressed file when |
| 41 | * the static file is updated. |
| 42 | * - Overrides server cache control config to allow caching |
| 43 | * - Sends Very Accept-Encoding to tell proxies to store different version of the static file according |
| 44 | * to users encoding capacities. |
| 45 | * |
| 46 | * Warning: |
| 47 | * Compressed filed are stored in the /tmp directory. |
| 48 | * If this method is used with two files bearing the same name but located in different locations, |
| 49 | * there is a risk of conflict. One file could be served with the content of the other. |
| 50 | * A future upgrade of this method would be to recreate the directory structure of the static file |
| 51 | * within a /tmp/compressed-static-files directory. |
| 52 | * |
| 53 | * @param string $file The location of the static file to serve |
| 54 | * @param string $contentType The content type of the static file. |
| 55 | * @param bool $expireFarFuture Day in the far future to set the Expires header to. |
| 56 | * Should be set to false for files that should not be cached. |
| 57 | * @param int|false $byteStart The starting byte in the file to serve. If false, the data from the beginning |
| 58 | * of the file will be served. |
| 59 | * @param int|false $byteEnd The ending byte in the file to serve. If false, the data from $byteStart to the |
| 60 | * end of the file will be served. |
| 61 | * @param string|false $filename By default the filename of $file is reused as Content-Disposition. If the |
| 62 | * file should be sent as a different filename to the client you can specify |
| 63 | * a custom filename here. |
| 64 | */ |
| 65 | public static function serverStaticFile($file, $contentType, $expireFarFutureDays = 100, $byteStart = \false, $byteEnd = \false, $filename = \false) |
| 66 | { |
| 67 | // if the file cannot be found return HTTP status code '404' |
| 68 | if (empty($file) || !file_exists($file)) { |
| 69 | \Piwik\Common::sendResponseCode(404); |
| 70 | return; |
| 71 | } |
| 72 | if (!is_readable($file)) { |
| 73 | \Piwik\Common::sendResponseCode(500); |
| 74 | return; |
| 75 | } |
| 76 | $modifiedSince = \Piwik\Http::getModifiedSinceHeader(); |
| 77 | $fileModifiedTime = @filemtime($file); |
| 78 | $lastModified = gmdate('D, d M Y H:i:s', $fileModifiedTime) . ' GMT'; |
| 79 | // set some HTTP response headers |
| 80 | self::overrideCacheControlHeaders('public'); |
| 81 | \Piwik\Common::sendHeader('Vary: Accept-Encoding'); |
| 82 | if (\false === $filename) { |
| 83 | $filename = basename($file); |
| 84 | } |
| 85 | \Piwik\Common::sendHeader('Content-Disposition: inline; filename=' . $filename); |
| 86 | if ($expireFarFutureDays) { |
| 87 | // Required by proxy caches potentially in between the browser and server to cache the request indeed |
| 88 | \Piwik\Common::sendHeader(self::getExpiresHeaderForFutureDay($expireFarFutureDays)); |
| 89 | } |
| 90 | // Return 304 if the file has not modified since |
| 91 | if ($modifiedSince === $lastModified) { |
| 92 | \Piwik\Common::sendResponseCode(304); |
| 93 | return; |
| 94 | } |
| 95 | // if we have to serve the file, serve it now, either in the clear or compressed |
| 96 | if ($byteStart === \false) { |
| 97 | $byteStart = 0; |
| 98 | } |
| 99 | if ($byteEnd === \false) { |
| 100 | $byteEnd = filesize($file); |
| 101 | } |
| 102 | $compressed = \false; |
| 103 | $encoding = ''; |
| 104 | $compressedFileLocation = \Piwik\AssetManager::getInstance()->getAssetDirectory() . '/' . basename($file); |
| 105 | if (!($byteStart == 0 && $byteEnd == filesize($file))) { |
| 106 | $compressedFileLocation .= ".{$byteStart}.{$byteEnd}"; |
| 107 | } |
| 108 | $phpOutputCompressionEnabled = self::isPhpOutputCompressed(); |
| 109 | if (isset($_SERVER['HTTP_ACCEPT_ENCODING']) && !$phpOutputCompressionEnabled) { |
| 110 | [$encoding, $extension] = self::getCompressionEncodingAcceptedByClient(); |
| 111 | $filegz = $compressedFileLocation . $extension; |
| 112 | if (self::canCompressInPhp()) { |
| 113 | if (!empty($encoding)) { |
| 114 | // compress the file if it doesn't exist or is newer than the existing cached file, and cache |
| 115 | // the compressed result |
| 116 | if (self::shouldCompressFile($file, $filegz)) { |
| 117 | self::compressFile($file, $filegz, $encoding, $byteStart, $byteEnd); |
| 118 | } |
| 119 | $compressed = \true; |
| 120 | $file = $filegz; |
| 121 | $byteStart = 0; |
| 122 | $byteEnd = filesize($file); |
| 123 | } |
| 124 | } else { |
| 125 | // if a compressed file exists, the file was manually compressed so we just serve that |
| 126 | if ($extension == '.gz' && !self::shouldCompressFile($file, $filegz)) { |
| 127 | $compressed = \true; |
| 128 | $file = $filegz; |
| 129 | $byteStart = 0; |
| 130 | $byteEnd = filesize($file); |
| 131 | } |
| 132 | } |
| 133 | } |
| 134 | \Piwik\Common::sendHeader('Last-Modified: ' . $lastModified); |
| 135 | if (!$phpOutputCompressionEnabled) { |
| 136 | \Piwik\Common::sendHeader('Content-Length: ' . ($byteEnd - $byteStart)); |
| 137 | } |
| 138 | if (!empty($contentType)) { |
| 139 | \Piwik\Common::sendHeader('Content-Type: ' . $contentType); |
| 140 | } |
| 141 | if ($compressed) { |
| 142 | \Piwik\Common::sendHeader('Content-Encoding: ' . $encoding); |
| 143 | } |
| 144 | // in case any notices were triggered before this point (eg in WordPress) etc. |
| 145 | // it would break the gzipped response since it would have mixed regular notice/string plus gzipped content |
| 146 | // and would not be able to decode the response |
| 147 | $levels = ob_get_level(); |
| 148 | for ($i = 0; $i < $levels; $i++) { |
| 149 | ob_end_clean(); |
| 150 | } |
| 151 | // clearing all output buffers combined with output compressions had bugs on certain PHP versions |
| 152 | // manually removing the Content-Encoding header fixes this |
| 153 | // See https://github.com/php/php-src/issues/8218 |
| 154 | if ($phpOutputCompressionEnabled && (version_compare(\PHP_VERSION, '8.0.17', '=') || version_compare(\PHP_VERSION, '8.0.18', '=') || version_compare(\PHP_VERSION, '8.1.4', '=') || version_compare(\PHP_VERSION, '8.1.5', '='))) { |
| 155 | header_remove("Content-Encoding"); |
| 156 | } |
| 157 | if (!_readfile($file, $byteStart, $byteEnd)) { |
| 158 | \Piwik\Common::sendResponseCode(500); |
| 159 | } |
| 160 | } |
| 161 | /** |
| 162 | * Test if php output is compressed |
| 163 | * |
| 164 | * @return bool True if php output is (or suspected/likely) to be compressed |
| 165 | */ |
| 166 | public static function isPhpOutputCompressed() |
| 167 | { |
| 168 | // Off = ''; On = '1'; otherwise, it's a buffer size |
| 169 | $zlibOutputCompression = ini_get('zlib.output_compression'); |
| 170 | // could be ob_gzhandler, ob_deflatehandler, etc |
| 171 | $outputHandler = ini_get('output_handler'); |
| 172 | // output handlers can be stacked |
| 173 | $obHandlers = array_filter(ob_list_handlers(), function ($var) { |
| 174 | return $var !== "default output handler"; |
| 175 | }); |
| 176 | // user defined handler via wrapper |
| 177 | if (!defined('PIWIK_TEST_MODE')) { |
| 178 | $autoPrependFile = ini_get('auto_prepend_file'); |
| 179 | $autoAppendFile = ini_get('auto_append_file'); |
| 180 | } |
| 181 | return !empty($zlibOutputCompression) || !empty($outputHandler) || !empty($obHandlers) || !empty($autoPrependFile) || !empty($autoAppendFile); |
| 182 | } |
| 183 | /** |
| 184 | * Workaround IE bug when downloading certain document types over SSL and |
| 185 | * cache control headers are present, e.g., |
| 186 | * |
| 187 | * Cache-Control: no-cache |
| 188 | * Cache-Control: no-store,max-age=0,must-revalidate |
| 189 | * Pragma: no-cache |
| 190 | * |
| 191 | * @see http://support.microsoft.com/kb/316431/ |
| 192 | * @see RFC2616 |
| 193 | * |
| 194 | * @param string $override One of "public", "private", "no-cache", or "no-store". (optional) |
| 195 | */ |
| 196 | public static function overrideCacheControlHeaders($override = null) |
| 197 | { |
| 198 | if ($override || self::isHttps()) { |
| 199 | \Piwik\Common::stripHeader('Pragma'); |
| 200 | \Piwik\Common::stripHeader('Expires'); |
| 201 | if (in_array($override, array('public', 'private', 'no-cache', 'no-store'))) { |
| 202 | \Piwik\Common::sendHeader("Cache-Control: {$override}, must-revalidate"); |
| 203 | } else { |
| 204 | \Piwik\Common::sendHeader('Cache-Control: must-revalidate'); |
| 205 | } |
| 206 | } |
| 207 | } |
| 208 | /** |
| 209 | * Returns a formatted Expires HTTP header for a certain number of days in the future. The result |
| 210 | * can be used in a call to `header()`. |
| 211 | */ |
| 212 | private static function getExpiresHeaderForFutureDay($expireFarFutureDays) |
| 213 | { |
| 214 | return "Expires: " . gmdate('D, d M Y H:i:s', time() + 86400 * (int) $expireFarFutureDays) . ' GMT'; |
| 215 | } |
| 216 | private static function getCompressionEncodingAcceptedByClient() |
| 217 | { |
| 218 | $acceptEncoding = $_SERVER['HTTP_ACCEPT_ENCODING']; |
| 219 | if (preg_match(self::GZIP_ENCODING_REGEX, $acceptEncoding, $matches)) { |
| 220 | return array('gzip', '.gz'); |
| 221 | } elseif (preg_match(self::DEFLATE_ENCODING_REGEX, $acceptEncoding, $matches)) { |
| 222 | return array('deflate', '.deflate'); |
| 223 | } else { |
| 224 | return array(\false, \false); |
| 225 | } |
| 226 | } |
| 227 | private static function canCompressInPhp() |
| 228 | { |
| 229 | return extension_loaded('zlib') && function_exists('file_get_contents') && function_exists('file_put_contents'); |
| 230 | } |
| 231 | private static function shouldCompressFile($fileToCompress, $compressedFilePath) |
| 232 | { |
| 233 | $toCompressLastModified = @filemtime($fileToCompress); |
| 234 | $compressedLastModified = @filemtime($compressedFilePath); |
| 235 | return !file_exists($compressedFilePath) || $toCompressLastModified > $compressedLastModified; |
| 236 | } |
| 237 | private static function compressFile($fileToCompress, $compressedFilePath, $compressionEncoding, $byteStart, $byteEnd) |
| 238 | { |
| 239 | $data = file_get_contents($fileToCompress); |
| 240 | $data = substr($data, $byteStart, $byteEnd - $byteStart); |
| 241 | if ($compressionEncoding == 'deflate') { |
| 242 | $data = gzdeflate($data, 9); |
| 243 | } elseif ($compressionEncoding == 'gzip' || $compressionEncoding == 'x-gzip') { |
| 244 | $data = self::gzencode($data); |
| 245 | } |
| 246 | if (\false === $data) { |
| 247 | throw new \Exception('compressing file ' . $fileToCompress . ' failed'); |
| 248 | } |
| 249 | file_put_contents($compressedFilePath, $data); |
| 250 | } |
| 251 | public static function gzencode($data) |
| 252 | { |
| 253 | return gzencode($data, 9); |
| 254 | } |
| 255 | } |
| 256 |