/**
* Returns true if we can minify
*
* @param string $buffer
* @return string
*/
function can_minify2($buffer)
{
/**
* Check for database error
*/
if (Util_Content::is_database_error($buffer)) {
$this->minify_reject_reason = 'Database Error occurred';
return false;
}
/**
* Check for DONOTMINIFY constant
*/
if (defined('DONOTMINIFY') && DONOTMINIFY) {
$this->minify_reject_reason = 'DONOTMINIFY constant is defined';
return false;
}
/**
* Check feed minify
*/
if ($this->_config->get_boolean('minify.html.reject.feed') && function_exists('is_feed') && is_feed()) {
$this->minify_reject_reason = 'Feed is rejected';
return false;
}
return true;
}
/**
* Returns headers for file
*
* @param array $file CDN file array
* @return array
*/
function _get_headers($file, $block_expires = false)
{
$local_path = $file['local_path'];
$mime_type = Util_Mime::get_mime_type($local_path);
$last_modified = time();
$link = $file['original_url'];
$headers = array('Content-Type' => $mime_type, 'Last-Modified' => Util_Content::http_date($last_modified), 'Access-Control-Allow-Origin' => '*', 'Link' => '<' . $link . '>; rel="canonical"');
if (isset($this->cache_config[$mime_type])) {
if ($this->cache_config[$mime_type]['etag']) {
$headers['ETag'] = '"' . @md5_file($local_path) . '"';
}
if ($this->cache_config[$mime_type]['w3tc']) {
$headers['X-Powered-By'] = Util_Environment::w3tc_header($this->_config);
}
$expires_set = false;
if (!$block_expires && $this->cache_config[$mime_type]['expires']) {
$headers['Expires'] = Util_Content::http_date(time() + $this->cache_config[$mime_type]['lifetime']);
$expires_set = true;
}
switch ($this->cache_config[$mime_type]['cache_control']) {
case 'cache':
$headers = array_merge($headers, array('Pragma' => 'public', 'Cache-Control' => 'public'));
break;
case 'cache_public_maxage':
$headers = array_merge($headers, array('Pragma' => 'public', 'Cache-Control' => ($expires_set ? '' : 'max-age=' . $this->cache_config[$mime_type]['lifetime'] . ', ') . 'public'));
break;
case 'cache_validation':
$headers = array_merge($headers, array('Pragma' => 'public', 'Cache-Control' => 'public, must-revalidate, proxy-revalidate'));
break;
case 'cache_noproxy':
$headers = array_merge($headers, array('Pragma' => 'public', 'Cache-Control' => 'private, must-revalidate'));
break;
case 'cache_maxage':
$headers = array_merge($headers, array('Pragma' => 'public', 'Cache-Control' => ($expires_set ? '' : 'max-age=' . $this->cache_config[$mime_type]['lifetime'] . ', ') . 'public, must-revalidate, proxy-revalidate'));
break;
case 'no_cache':
$headers = array_merge($headers, array('Pragma' => 'no-cache', 'Cache-Control' => 'max-age=0, private, no-store, no-cache, must-revalidate'));
break;
}
}
return $headers;
}
function get_replaced_urls()
{
$strings = array();
if (count($this->_replaced_urls)) {
$strings[] = "Replaced URLs:";
foreach ($this->_replaced_urls as $old_url => $new_url) {
$strings[] = sprintf("%s => %s", Util_Content::escape_comment($old_url), Util_Content::escape_comment($new_url));
}
}
return $strings;
}
/**
* Output buffer callback
*
* @param string $buffer
* @return mixed
*/
function ob_callback($buffer)
{
if ($buffer != '' && Util_Content::is_html($buffer)) {
$domain_url_regexp = Util_Environment::home_domain_root_url_regexp();
$buffer = preg_replace_callback('~(href|src|action|extsrc|asyncsrc|w3tc_load_js\\()=?([\'"])((' . $domain_url_regexp . ')?(/[^\'"]*\\.([a-z-_]+)(\\?[^\'"]*)?))[\'"]~Ui', array($this, 'link_replace_callback'), $buffer);
}
return $buffer;
}
/**
* Output buffering callback
*
* @param string $buffer
* @return string
*/
function ob_callback($buffer)
{
global $wpdb;
global $w3_late_caching_succeeded;
if ($w3_late_caching_succeeded) {
return $buffer;
}
if (Util_Content::is_database_error($buffer)) {
status_header(503);
} else {
if (Util_Content::can_print_comment($buffer)) {
/**
* Add footer comment
*/
$date = date_i18n('Y-m-d H:i:s');
$host = !empty($_SERVER['SERVER_NAME']) ? $_SERVER['SERVER_NAME'] : 'localhost';
if (Util_Environment::is_preview_mode()) {
$buffer .= "\r\n<!-- W3 Total Cache used in preview mode -->";
}
if ($this->_config->get_string('common.support') != '' || $this->_config->get_boolean('common.tweeted')) {
$buffer .= sprintf("\r\n<!-- Served from: %s @ %s by W3 Total Cache -->", Util_Content::escape_comment($host), $date);
} else {
$strings = array();
$strings = apply_filters('w3tc_footer_comment', $strings);
$buffer .= "\r\n<!-- Performance optimized by W3 Total Cache. Learn more: https://www.w3-edge.com/products/\r\n";
if (count($strings)) {
$buffer .= "\r\n" . Util_Content::escape_comment(implode("\r\n", $strings)) . "\r\n";
}
$buffer .= sprintf("\r\n Served from: %s @ %s by W3 Total Cache -->", Util_Content::escape_comment($host), $date);
}
}
$buffer = Util_Bus::do_ob_callbacks(array('minify', 'newrelic', 'cdn', 'browsercache', 'pagecache'), $buffer);
}
return $buffer;
}
/**
* Sends headers
*
* @param boolean $is_404
* @param string $etag
* @param integer $time
* @param string $compression
* @param array $custom_headers
* @return boolean
*/
function _send_headers($is_404, $time, $etag, $compression, $custom_headers = array())
{
$exit = false;
$headers = is_array($custom_headers) ? $custom_headers : array();
$curr_time = time();
$bc_lifetime = $this->_config->get_integer('browsercache.html.lifetime');
$expires = (is_null($time) ? $curr_time : $time) + $bc_lifetime;
$max_age = $expires > $curr_time ? $expires - $curr_time : 0;
if ($is_404) {
/**
* Add 404 header
*/
$headers = array_merge($headers, array('Status' => 'HTTP/1.1 404 Not Found'));
} elseif (!is_null($time) && $this->_check_modified_since($time) || $this->_check_match($etag)) {
/**
* Add 304 header
*/
$headers = array_merge($headers, array('Status' => 'HTTP/1.1 304 Not Modified'));
/**
* Don't send content if it isn't modified
*/
$exit = true;
}
if ($this->_config->get_boolean('browsercache.enabled')) {
if ($this->_config->get_boolean('browsercache.html.last_modified')) {
$headers = array_merge($headers, array('Last-Modified' => Util_Content::http_date($time)));
}
if ($this->_config->get_boolean('browsercache.html.expires')) {
$headers = array_merge($headers, array('Expires' => Util_Content::http_date($expires)));
}
if ($this->_config->get_boolean('browsercache.html.cache.control')) {
switch ($this->_config->get_string('browsercache.html.cache.policy')) {
case 'cache':
$headers = array_merge($headers, array('Pragma' => 'public', 'Cache-Control' => 'public'));
break;
case 'cache_public_maxage':
$headers = array_merge($headers, array('Pragma' => 'public', 'Cache-Control' => sprintf('max-age=%d, public', $max_age)));
break;
case 'cache_validation':
$headers = array_merge($headers, array('Pragma' => 'public', 'Cache-Control' => 'public, must-revalidate, proxy-revalidate'));
break;
case 'cache_noproxy':
$headers = array_merge($headers, array('Pragma' => 'public', 'Cache-Control' => 'private, must-revalidate'));
break;
case 'cache_maxage':
$headers = array_merge($headers, array('Pragma' => 'public', 'Cache-Control' => sprintf('max-age=%d, public, must-revalidate, proxy-revalidate', $max_age)));
break;
case 'no_cache':
$headers = array_merge($headers, array('Pragma' => 'no-cache', 'Cache-Control' => 'max-age=0, private, no-store, no-cache, must-revalidate'));
break;
}
}
if ($this->_config->get_boolean('browsercache.html.etag')) {
$headers = array_merge($headers, array('ETag' => '"' . $etag . '"'));
}
if ($this->_config->get_boolean('browsercache.html.w3tc')) {
$headers = array_merge($headers, array('X-Powered-By' => Util_Environment::w3tc_header()));
}
}
$vary = '';
//compressed && UAG
if ($compression && $this->_get_mobile_group()) {
$vary = 'Accept-Encoding,User-Agent,Cookie';
$headers = array_merge($headers, array('Content-Encoding' => $compression));
//compressed
} elseif ($compression) {
$vary = 'Accept-Encoding';
$headers = array_merge($headers, array('Content-Encoding' => $compression));
//uncompressed && UAG
} elseif ($this->_get_mobile_group()) {
$vary = 'User-Agent,Cookie';
}
//Add Cookie to vary if user logged in and not previously set
if (!$this->_check_logged_in() && strpos($vary, 'Cookie') === false) {
if ($vary) {
$vary .= ',Cookie';
} else {
$vary = 'Cookie';
}
}
/**
* Add vary header
*/
if ($vary) {
$headers = array_merge($headers, array('Vary' => $vary));
}
/**
* Disable caching for preview mode
*/
if (Util_Environment::is_preview_mode()) {
$headers = array_merge($headers, array('Pragma' => 'private', 'Cache-Control' => 'private'));
}
/**
* Send headers to client
*/
$result = $this->_headers($headers);
if ($exit) {
exit;
}
return $result;
}