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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* This file contains CSS file serving functions.
*
* NOTE: these functions are not expected to be used from any addons.
*
* @package core
* @copyright 2012 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
if (!defined('THEME_DESIGNER_CACHE_LIFETIME')) {
// This can be also set in config.php file,
// it needs to be higher than the time it takes to generate all CSS content.
define('THEME_DESIGNER_CACHE_LIFETIME', 10);
}
/**
* Stores CSS in a file at the given path.
*
* This function either succeeds or throws an exception.
*
* @param theme_config $theme The theme that the CSS belongs to.
* @param string $csspath The path to store the CSS at.
* @param string $csscontent the complete CSS in one string.
*/
function css_store_css(theme_config $theme, $csspath, $csscontent) {
global $CFG;
clearstatcache();
if (!file_exists(dirname($csspath))) {
@mkdir(dirname($csspath), $CFG->directorypermissions, true);
}
// Prevent serving of incomplete file from concurrent request,
// the rename() should be more atomic than fwrite().
ignore_user_abort(true);
// First up write out the single file for all those using decent browsers.
css_write_file($csspath, $csscontent);
ignore_user_abort(false);
if (connection_aborted()) {
die;
}
}
/**
* Writes a CSS file.
*
* @param string $filename
* @param string $content
*/
function css_write_file($filename, $content) {
global $CFG;
if ($fp = fopen($filename.'.tmp', 'xb')) {
fwrite($fp, $content);
fclose($fp);
rename($filename.'.tmp', $filename);
@chmod($filename, $CFG->filepermissions);
@unlink($filename.'.tmp'); // Just in case anything fails.
}
}
/**
* Sends a cached CSS file
*
* This function sends the cached CSS file. Remember it is generated on the first
* request, then optimised/minified, and finally cached for serving.
*
* @param string $csspath The path to the CSS file we want to serve.
* @param string $etag The revision to make sure we utilise any caches.
*/
function css_send_cached_css($csspath, $etag) {
// 90 days only - based on Moodle point release cadence being every 3 months.
$lifetime = 60 * 60 * 24 * 90;
header('Etag: "'.$etag.'"');
header('Content-Disposition: inline; filename="styles.php"');
header('Last-Modified: '. gmdate('D, d M Y H:i:s', filemtime($csspath)) .' GMT');
header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
header('Pragma: ');
header('Cache-Control: public, max-age='.$lifetime.', immutable');
header('Accept-Ranges: none');
header('Content-Type: text/css; charset=utf-8');
if (!min_enable_zlib_compression()) {
header('Content-Length: '.filesize($csspath));
}
readfile($csspath);
die;
}
/**
* Sends a cached CSS content
*
* @param string $csscontent The actual CSS markup.
* @param string $etag The revision to make sure we utilise any caches.
*/
function css_send_cached_css_content($csscontent, $etag) {
// 90 days only - based on Moodle point release cadence being every 3 months.
$lifetime = 60 * 60 * 24 * 90;
header('Etag: "'.$etag.'"');
header('Content-Disposition: inline; filename="styles.php"');
header('Last-Modified: '. gmdate('D, d M Y H:i:s', time()) .' GMT');
header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
header('Pragma: ');
header('Cache-Control: public, max-age='.$lifetime.', immutable');
header('Accept-Ranges: none');
header('Content-Type: text/css; charset=utf-8');
if (!min_enable_zlib_compression()) {
header('Content-Length: '.strlen($csscontent));
}
echo($csscontent);
die;
}
/**
* Sends CSS directly and disables all caching.
* The Content-Length of the body is also included, but the script is not ended.
*
* @param string $css The CSS content to send
*/
function css_send_temporary_css($css) {
header('Cache-Control: no-cache, no-store, must-revalidate');
header('Pragma: no-cache');
header('Expires: 0');
header('Content-Disposition: inline; filename="styles_debug.php"');
header('Last-Modified: '. gmdate('D, d M Y H:i:s', time()) .' GMT');
header('Accept-Ranges: none');
header('Content-Type: text/css; charset=utf-8');
header('Content-Length: ' . strlen($css));
echo $css;
}
/**
* Sends CSS directly without caching it.
*
* This function takes a raw CSS string, optimises it if required, and then
* serves it.
* Turning both themedesignermode and CSS optimiser on at the same time is awful
* for performance because of the optimiser running here. However it was done so
* that theme designers could utilise the optimised output during development to
* help them optimise their CSS... not that they should write lazy CSS.
*
* @param string $css
*/
function css_send_uncached_css($css) {
header('Content-Disposition: inline; filename="styles_debug.php"');
header('Last-Modified: '. gmdate('D, d M Y H:i:s', time()) .' GMT');
header('Expires: '. gmdate('D, d M Y H:i:s', time() + THEME_DESIGNER_CACHE_LIFETIME) .' GMT');
header('Pragma: ');
header('Accept-Ranges: none');
header('Content-Type: text/css; charset=utf-8');
if (is_array($css)) {
$css = implode("\n\n", $css);
}
echo $css;
die;
}
/**
* Send file not modified headers
*
* @param int $lastmodified
* @param string $etag
*/
function css_send_unmodified($lastmodified, $etag) {
// 90 days only - based on Moodle point release cadence being every 3 months.
$lifetime = 60 * 60 * 24 * 90;
header('HTTP/1.1 304 Not Modified');
header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
header('Cache-Control: public, max-age='.$lifetime);
header('Content-Type: text/css; charset=utf-8');
header('Etag: "'.$etag.'"');
if ($lastmodified) {
header('Last-Modified: '. gmdate('D, d M Y H:i:s', $lastmodified) .' GMT');
}
die;
}
/**
* Sends a 404 message about CSS not being found.
*/
function css_send_css_not_found() {
header('HTTP/1.0 404 not found');
die('CSS was not found, sorry.');
}