/**
* Returns headers for file
*
* @param array $file CDN file array
* @return array
*/
function _get_headers($file)
{
w3_require_once(W3TC_INC_DIR . '/functions/mime.php');
$local_path = $file['local_path'];
$mime_type = w3_get_mime_type($local_path);
$last_modified = time();
$link = $file['original_url'];
$headers = array('Content-Type' => $mime_type, 'Last-Modified' => w3_http_date($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']) {
$headers['X-Powered-By'] = W3TC_POWERED_BY;
}
if ($this->cache_config[$mime_type]['expires']) {
$headers['Expires'] = w3_http_date(time() + $this->cache_config[$mime_type]['lifetime']);
}
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' => ($this->cache_config[$mime_type]['expires'] ? '' : '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' => 'public, must-revalidate'));
break;
case 'cache_maxage':
$headers = array_merge($headers, array('Pragma' => 'public', 'Cache-Control' => ($this->cache_config[$mime_type]['expires'] ? '' : '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;
}
/**
* 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 = array();
$curr_time = time();
$expires = $time + $this->_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 ($this->_check_modified_since($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;
}
/**
* Add default headers
*/
$headers = array_merge($headers, array('Last-Modified' => w3_http_date($time), 'Vary' => 'Cookie'));
if ($this->_config->get_boolean('browsercache.enabled')) {
if ($this->_config->get_boolean('browsercache.html.expires')) {
$headers = array_merge($headers, array('Expires' => w3_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_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' => 'public, 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' => W3TC_POWERED_BY));
}
}
if ($compression) {
/**
* Add Content-Encoding header
*/
$headers = array_merge($headers, array('Vary' => 'Accept-Encoding, Cookie', 'Content-Encoding' => $compression));
}
/**
* Add custom headers
*/
$headers = array_merge($headers, $custom_headers);
/**
* Disable caching for preview mode
*/
if (w3_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;
}
/**
* 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 = 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' => w3_http_date($time)));
}
if ($this->_config->get_boolean('browsercache.html.expires')) {
$headers = array_merge($headers, array('Expires' => w3_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' => W3TC_POWERED_BY));
}
}
$vary = '';
//compressed && UAG
if ($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));
}
/**
* Add custom headers
*/
$headers = array_merge($headers, $custom_headers);
/**
* Disable caching for preview mode
*/
if (w3_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;
}
/**
* Returns headers for file
*
* @param string $file
* @return array
*/
function _get_headers($file)
{
$mime_type = w3_get_mime_type($file);
$last_modified = time();
$headers = array('Content-Type' => $mime_type, 'Last-Modified' => w3_http_date($last_modified), 'Access-Control-Allow-Origin' => '*');
if (isset($this->cache_config[$mime_type])) {
if ($this->cache_config[$mime_type]['etag']) {
$headers['Etag'] = @md5_file($file);
}
if ($this->cache_config[$mime_type]['w3tc']) {
$headers['X-Powered-By'] = W3TC_POWERED_BY;
}
switch ($this->cache_config[$mime_type]['cache_control']) {
case 'cache':
$headers = array_merge($headers, array('Pragma' => 'public', 'Cache-Control' => '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' => 'public, must-revalidate'));
break;
case 'cache_maxage':
$headers = array_merge($headers, array('Pragma' => 'public', 'Cache-Control' => '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;
}
