| 1 |
<?php |
| 2 |
|
| 3 |
if (!defined('ABSPATH')) die('No direct access allowed'); |
| 4 |
|
| 5 |
/** |
| 6 |
* Holds utility functions used by file based cache |
| 7 |
*/ |
| 8 |
|
| 9 |
/** |
| 10 |
* Cache output before it goes to the browser |
| 11 |
* |
| 12 |
* @param string $buffer Page HTML. |
| 13 |
* @param int $flags OB flags to be passed through. |
| 14 |
* @return string |
| 15 |
*/ |
| 16 |
function wpo_cache($buffer, $flags) { |
| 17 |
global $post; |
| 18 |
|
| 19 |
if (strlen($buffer) < 255) { |
| 20 |
return $buffer; |
| 21 |
} |
| 22 |
|
| 23 |
// Don't cache search, 404, or password protected. |
| 24 |
if (is_404() || is_search() || !empty($post->post_password)) { |
| 25 |
return $buffer; |
| 26 |
} |
| 27 |
|
| 28 |
// No root cache folder, exit here |
| 29 |
if (!file_exists(WPO_CACHE_DIR)) { |
| 30 |
// Can not cache! |
| 31 |
return $buffer; |
| 32 |
} |
| 33 |
|
| 34 |
// Try creating a folder for cached files, if it was flushed recently |
| 35 |
if (!file_exists(WPO_CACHE_FILES_DIR)) { |
| 36 |
if (!mkdir(WPO_CACHE_FILES_DIR)) { |
| 37 |
// Can not cache! |
| 38 |
return $buffer; |
| 39 |
} |
| 40 |
} |
| 41 |
|
| 42 |
$buffer = apply_filters('wpo_pre_cache_buffer', $buffer); |
| 43 |
|
| 44 |
$url_path = wpo_get_url_path(); |
| 45 |
|
| 46 |
$dirs = explode('/', $url_path); |
| 47 |
|
| 48 |
$path = WPO_CACHE_FILES_DIR; |
| 49 |
|
| 50 |
foreach ($dirs as $dir) { |
| 51 |
if (!empty($dir)) { |
| 52 |
$path .= '/' . $dir; |
| 53 |
|
| 54 |
if (!file_exists($path)) { |
| 55 |
if (!mkdir($path)) { |
| 56 |
// Can not cache! |
| 57 |
return $buffer; |
| 58 |
} |
| 59 |
} |
| 60 |
} |
| 61 |
} |
| 62 |
|
| 63 |
$modified_time = time(); // Make sure modified time is consistent. |
| 64 |
|
| 65 |
// Prevent mixed content when there's an http request but the site URL uses https. |
| 66 |
$home_url = get_home_url(); |
| 67 |
|
| 68 |
if (!is_ssl() && 'https' === strtolower(parse_url($home_url, PHP_URL_SCHEME))) { |
| 69 |
$https_home_url = $home_url; |
| 70 |
$http_home_url = str_ireplace('https://', 'http://', $https_home_url); |
| 71 |
$buffer = str_replace(esc_url($http_home_url), esc_url($https_home_url), $buffer); |
| 72 |
} |
| 73 |
|
| 74 |
if (preg_match('#</html>#i', $buffer)) { |
| 75 |
if (!empty($GLOBALS['wpo_cache_config']['enable_mobile_caching']) && wpo_is_mobile()) { |
| 76 |
$buffer .= "\n<!-- Cached by WP Optimize for mobile devices - Last modified: " . gmdate('D, d M Y H:i:s', $modified_time) . " GMT -->\n"; |
| 77 |
} else { |
| 78 |
$buffer .= "\n<!-- Cached by WP Optimize - Last modified: " . gmdate('D, d M Y H:i:s', $modified_time) . " GMT -->\n"; |
| 79 |
} |
| 80 |
} |
| 81 |
|
| 82 |
if (!empty($GLOBALS['wpo_cache_config']['enable_gzip_compression']) && function_exists('gzencode')) { |
| 83 |
if (!empty($GLOBALS['wpo_cache_config']['enable_mobile_caching']) && wpo_is_mobile()) { |
| 84 |
file_put_contents($path . '/mobile.index.gzip.html', gzencode($buffer, 3)); |
| 85 |
touch($path . '/mobile.index.gzip.html', $modified_time); |
| 86 |
} else { |
| 87 |
file_put_contents($path . '/index.gzip.html', gzencode($buffer, 3)); |
| 88 |
touch($path . '/index.gzip.html', $modified_time); |
| 89 |
} |
| 90 |
} else { |
| 91 |
if (!empty($GLOBALS['wpo_cache_config']['enable_mobile_caching']) && wpo_is_mobile()) { |
| 92 |
file_put_contents($path . '/mobile.index.html', $buffer); |
| 93 |
touch($path . '/mobile.index.html', $modified_time); |
| 94 |
} else { |
| 95 |
file_put_contents($path . '/index.html', $buffer); |
| 96 |
touch($path . '/index.html', $modified_time); |
| 97 |
} |
| 98 |
} |
| 99 |
|
| 100 |
header('Cache-Control: no-cache'); // Check back every time to see if re-download is necessary. |
| 101 |
header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $modified_time) . ' GMT'); |
| 102 |
|
| 103 |
if (function_exists('ob_gzhandler') && !empty($GLOBALS['wpo_cache_config']['enable_gzip_compression'])) { |
| 104 |
return ob_gzhandler($buffer, $flags); |
| 105 |
} else { |
| 106 |
return $buffer; |
| 107 |
} |
| 108 |
} |
| 109 |
|
| 110 |
/** |
| 111 |
* Serves the cache and exits |
| 112 |
*/ |
| 113 |
function wpo_serve_cache() { |
| 114 |
$file_name = 'index.html'; |
| 115 |
|
| 116 |
if (function_exists('gzencode') && !empty($GLOBALS['wpo_cache_config']['enable_gzip_compression'])) { |
| 117 |
$file_name = 'index.gzip.html'; |
| 118 |
} |
| 119 |
|
| 120 |
if (!empty($GLOBALS['wpo_cache_config']['enable_mobile_caching']) && wpo_is_mobile()) { |
| 121 |
$file_name = 'mobile.' . $file_name; |
| 122 |
} |
| 123 |
|
| 124 |
$path = WPO_CACHE_FILES_DIR . '/' . rtrim(wpo_get_url_path(), '/') . '/' . $file_name; |
| 125 |
|
| 126 |
|
| 127 |
$modified_time = file_exists($path) ? (int) filemtime($path) : time(); |
| 128 |
|
| 129 |
header('Cache-Control: no-cache'); // Check back in an hour. |
| 130 |
|
| 131 |
if (!empty($modified_time) && !empty($_SERVER['HTTP_IF_MODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) === $modified_time) { |
| 132 |
if (function_exists('gzencode') && !empty($GLOBALS['wpo_cache_config']['enable_gzip_compression'])) { |
| 133 |
header('Content-Encoding: gzip'); |
| 134 |
} |
| 135 |
|
| 136 |
header($_SERVER['SERVER_PROTOCOL'] . ' 304 Not Modified', true, 304); |
| 137 |
exit; |
| 138 |
} |
| 139 |
|
| 140 |
if (file_exists($path) && is_readable($path)) { |
| 141 |
if (function_exists('gzencode') && !empty($GLOBALS['wpo_cache_config']['enable_gzip_compression'])) { |
| 142 |
header('Content-Encoding: gzip'); |
| 143 |
} |
| 144 |
|
| 145 |
readfile($path); |
| 146 |
|
| 147 |
exit; |
| 148 |
} |
| 149 |
} |
| 150 |
|
| 151 |
/** |
| 152 |
* Clears the cache |
| 153 |
*/ |
| 154 |
function wpo_cache_flush() { |
| 155 |
|
| 156 |
$this->wpo_delete_files(WPO_CACHE_FILES_DIR); |
| 157 |
|
| 158 |
if (function_exists('wp_cache_flush')) { |
| 159 |
wp_cache_flush(); |
| 160 |
} |
| 161 |
} |
| 162 |
|
| 163 |
/** |
| 164 |
* Get URL path for caching |
| 165 |
* |
| 166 |
* @since 1.0 |
| 167 |
* @return string |
| 168 |
*/ |
| 169 |
function wpo_get_url_path() { |
| 170 |
|
| 171 |
$host = !empty($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : ''; |
| 172 |
|
| 173 |
return rtrim($host, '/') . $_SERVER['REQUEST_URI']; |
| 174 |
} |
| 175 |
|
| 176 |
|
| 177 |
/** |
| 178 |
* Return true of exception url matches current url |
| 179 |
* |
| 180 |
* @param string $exception Exceptions to check URL against. |
| 181 |
* @param bool $regex Whether to check with regex or not. |
| 182 |
* @return bool true if matched, false otherwise |
| 183 |
*/ |
| 184 |
function wpo_url_exception_match($exception, $regex = false ) { |
| 185 |
if (preg_match('#^[\s]*$#', $exception)) return false; |
| 186 |
|
| 187 |
$exception = trim($exception); |
| 188 |
|
| 189 |
if (!preg_match('#^/#', $exception)) { |
| 190 |
|
| 191 |
$url = rtrim('http' . (isset($_SERVER['HTTPS']) ? 's' : '' ) . '://' . "{$_SERVER['HTTP_HOST']}{$_SERVER['REQUEST_URI']}", '/'); |
| 192 |
|
| 193 |
if ($regex) { |
| 194 |
if (preg_match('#^' . $exception . '$#', $url)) { |
| 195 |
// Exception match! |
| 196 |
return true; |
| 197 |
} |
| 198 |
} elseif (preg_match('#\*$#', $exception)) { |
| 199 |
$filtered_exception = str_replace('*', '', $exception); |
| 200 |
|
| 201 |
if (preg_match('#^' . $filtered_exception . '#', $url)) { |
| 202 |
// Exception match! |
| 203 |
return true; |
| 204 |
} |
| 205 |
} else { |
| 206 |
$exception = rtrim($exception, '/'); |
| 207 |
|
| 208 |
if (strtolower($exception) === strtolower($url)) { |
| 209 |
// Exception match! |
| 210 |
return true; |
| 211 |
} |
| 212 |
} |
| 213 |
} else { |
| 214 |
$path = $_SERVER['REQUEST_URI']; |
| 215 |
|
| 216 |
if ($regex) { |
| 217 |
if (preg_match('#^' . $exception . '$#', $path)) { |
| 218 |
// Exception match! |
| 219 |
return true; |
| 220 |
} |
| 221 |
} elseif (preg_match('#\*$#', $exception)) { |
| 222 |
$filtered_exception = preg_replace('#/?\*#', '', $exception); |
| 223 |
|
| 224 |
if (preg_match('#^' . $filtered_exception . '#i', $path)) { |
| 225 |
// Exception match! |
| 226 |
return true; |
| 227 |
} |
| 228 |
} else { |
| 229 |
if ('/' !== $path) { |
| 230 |
$path = rtrim($path, '/'); |
| 231 |
} |
| 232 |
|
| 233 |
if ('/' !== $exception) { |
| 234 |
$exception = rtrim($exception, '/'); |
| 235 |
} |
| 236 |
|
| 237 |
if (strtolower($exception) === strtolower($path)) { |
| 238 |
// Exception match! |
| 239 |
return true; |
| 240 |
} |
| 241 |
} |
| 242 |
} |
| 243 |
|
| 244 |
return false; |
| 245 |
} |
| 246 |
|
| 247 |
/** |
| 248 |
* Checks if its a mobile device |
| 249 |
* |
| 250 |
* @see https://developer.wordpress.org/reference/functions/wp_is_mobile/ |
| 251 |
*/ |
| 252 |
function wpo_is_mobile() { |
| 253 |
if (empty($_SERVER['HTTP_USER_AGENT'])) { |
| 254 |
$is_mobile = false; |
| 255 |
// many mobile devices (all iPhone, iPad, etc.) |
| 256 |
} elseif (false !== strpos($_SERVER['HTTP_USER_AGENT'], 'Mobile') |
| 257 |
|| false !== strpos($_SERVER['HTTP_USER_AGENT'], 'Android') |
| 258 |
|| false !== strpos($_SERVER['HTTP_USER_AGENT'], 'Silk/') |
| 259 |
|| false !== strpos($_SERVER['HTTP_USER_AGENT'], 'Kindle') |
| 260 |
|| false !== strpos($_SERVER['HTTP_USER_AGENT'], 'BlackBerry') |
| 261 |
|| false !== strpos($_SERVER['HTTP_USER_AGENT'], 'Opera Mini') |
| 262 |
|| false !== strpos($_SERVER['HTTP_USER_AGENT'], 'Opera Mobi') |
| 263 |
) { |
| 264 |
$is_mobile = true; |
| 265 |
} else { |
| 266 |
$is_mobile = false; |
| 267 |
} |
| 268 |
|
| 269 |
return $is_mobile; |
| 270 |
} |
| 271 |
|
| 272 |
/** |
| 273 |
* Delete function that deals with directories recursively |
| 274 |
* |
| 275 |
* @param string $src path of the folder |
| 276 |
*/ |
| 277 |
function wpo_delete_files($src) { |
| 278 |
if (!file_exists($src)) return; |
| 279 |
|
| 280 |
if (is_file($src)) unlink($src); |
| 281 |
|
| 282 |
$dir = opendir($src); |
| 283 |
$file = readdir($dir); |
| 284 |
|
| 285 |
while (false !== $file) { |
| 286 |
if ('.' != $file && '..' != $file) { |
| 287 |
if (is_dir($src . '/' . $file)) { |
| 288 |
wpo_delete_files($src . '/' . $file); |
| 289 |
} else { |
| 290 |
unlink($src . '/' . $file); |
| 291 |
} |
| 292 |
} |
| 293 |
} |
| 294 |
|
| 295 |
closedir($dir); |
| 296 |
rmdir($src); |
| 297 |
} |
| 298 |
|
