Bart Visscher
14 years ago
parent
2faae817f1
commit
f71fec8cdc
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<?php |
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/** |
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* Minification of CSS stylesheets. |
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* |
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* Copyright 2010 Wikimedia Foundation |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); you may |
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* not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software distributed |
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* under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS |
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* OF ANY KIND, either express or implied. See the License for the |
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* specific language governing permissions and limitations under the License. |
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* |
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* @file |
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* @version 0.1.1 -- 2010-09-11 |
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* @author Trevor Parscal <tparscal@wikimedia.org> |
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* @copyright Copyright 2010 Wikimedia Foundation |
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* @license http://www.apache.org/licenses/LICENSE-2.0 |
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*/ |
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|
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/** |
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* Transforms CSS data |
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* |
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* This class provides minification, URL remapping, URL extracting, and data-URL embedding. |
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*/ |
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class CSSMin { |
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|
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/* Constants */ |
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|
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/** |
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* Maximum file size to still qualify for in-line embedding as a data-URI |
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* |
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* 24,576 is used because Internet Explorer has a 32,768 byte limit for data URIs, |
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* which when base64 encoded will result in a 1/3 increase in size. |
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*/ |
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const EMBED_SIZE_LIMIT = 24576; |
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const URL_REGEX = 'url\(\s*[\'"]?(?P<file>[^\?\)\'"]*)(?P<query>\??[^\)\'"]*)[\'"]?\s*\)'; |
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|
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/* Protected Static Members */ |
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|
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/** @var array List of common image files extensions and mime-types */ |
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protected static $mimeTypes = array( |
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'gif' => 'image/gif', |
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'jpe' => 'image/jpeg', |
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'jpeg' => 'image/jpeg', |
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'jpg' => 'image/jpeg', |
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'png' => 'image/png', |
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'tif' => 'image/tiff', |
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'tiff' => 'image/tiff', |
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'xbm' => 'image/x-xbitmap', |
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); |
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|
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/* Static Methods */ |
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|
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/** |
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* Gets a list of local file paths which are referenced in a CSS style sheet |
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* |
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* @param $source string CSS data to remap |
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* @param $path string File path where the source was read from (optional) |
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* @return array List of local file references |
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*/ |
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public static function getLocalFileReferences( $source, $path = null ) { |
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$files = array(); |
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$rFlags = PREG_OFFSET_CAPTURE | PREG_SET_ORDER; |
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if ( preg_match_all( '/' . self::URL_REGEX . '/', $source, $matches, $rFlags ) ) { |
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foreach ( $matches as $match ) { |
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$file = ( isset( $path ) |
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? rtrim( $path, '/' ) . '/' |
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: '' ) . "{$match['file'][0]}"; |
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|
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// Only proceed if we can access the file |
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if ( !is_null( $path ) && file_exists( $file ) ) { |
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$files[] = $file; |
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} |
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} |
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} |
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return $files; |
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} |
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|
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/** |
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* @param $file string |
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* @return bool|string |
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*/ |
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protected static function getMimeType( $file ) { |
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$realpath = realpath( $file ); |
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// Try a couple of different ways to get the mime-type of a file, in order of |
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// preference |
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if ( |
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$realpath |
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&& function_exists( 'finfo_file' ) |
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&& function_exists( 'finfo_open' ) |
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&& defined( 'FILEINFO_MIME_TYPE' ) |
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) { |
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// As of PHP 5.3, this is how you get the mime-type of a file; it uses the Fileinfo |
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// PECL extension |
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return finfo_file( finfo_open( FILEINFO_MIME_TYPE ), $realpath ); |
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} elseif ( function_exists( 'mime_content_type' ) ) { |
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// Before this was deprecated in PHP 5.3, this was how you got the mime-type of a file |
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return mime_content_type( $file ); |
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} else { |
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// Worst-case scenario has happened, use the file extension to infer the mime-type |
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$ext = strtolower( pathinfo( $file, PATHINFO_EXTENSION ) ); |
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if ( isset( self::$mimeTypes[$ext] ) ) { |
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return self::$mimeTypes[$ext]; |
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} |
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} |
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return false; |
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} |
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|
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/** |
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* Remaps CSS URL paths and automatically embeds data URIs for URL rules |
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* preceded by an /* @embed * / comment |
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* |
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* @param $source string CSS data to remap |
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* @param $local string File path where the source was read from |
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* @param $remote string URL path to the file |
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* @param $embedData bool If false, never do any data URI embedding, even if / * @embed * / is found |
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* @return string Remapped CSS data |
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*/ |
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public static function remap( $source, $local, $remote, $embedData = true ) { |
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$pattern = '/((?P<embed>\s*\/\*\s*\@embed\s*\*\/)(?P<pre>[^\;\}]*))?' . |
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self::URL_REGEX . '(?P<post>[^;]*)[\;]?/'; |
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$offset = 0; |
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while ( preg_match( $pattern, $source, $match, PREG_OFFSET_CAPTURE, $offset ) ) { |
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// Skip fully-qualified URLs and data URIs |
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$urlScheme = parse_url( $match['file'][0], PHP_URL_SCHEME ); |
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if ( $urlScheme ) { |
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// Move the offset to the end of the match, leaving it alone |
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$offset = $match[0][1] + strlen( $match[0][0] ); |
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continue; |
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} |
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// URLs with absolute paths like /w/index.php need to be expanded |
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// to absolute URLs but otherwise left alone |
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if ( $match['file'][0] !== '' && $match['file'][0][0] === '/' ) { |
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// Replace the file path with an expanded (possibly protocol-relative) URL |
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// ...but only if wfExpandUrl() is even available. |
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// This will not be the case if we're running outside of MW |
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$lengthIncrease = 0; |
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if ( function_exists( 'wfExpandUrl' ) ) { |
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$expanded = wfExpandUrl( $match['file'][0], PROTO_RELATIVE ); |
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$origLength = strlen( $match['file'][0] ); |
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$lengthIncrease = strlen( $expanded ) - $origLength; |
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$source = substr_replace( $source, $expanded, |
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$match['file'][1], $origLength |
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); |
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} |
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// Move the offset to the end of the match, leaving it alone |
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$offset = $match[0][1] + strlen( $match[0][0] ) + $lengthIncrease; |
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continue; |
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} |
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// Shortcuts |
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$embed = $match['embed'][0]; |
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$pre = $match['pre'][0]; |
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$post = $match['post'][0]; |
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$query = $match['query'][0]; |
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$url = "{$remote}/{$match['file'][0]}"; |
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$file = "{$local}/{$match['file'][0]}"; |
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// bug 27052 - Guard against double slashes, because foo//../bar |
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// apparently resolves to foo/bar on (some?) clients |
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$url = preg_replace( '#([^:])//+#', '\1/', $url ); |
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$replacement = false; |
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if ( $local !== false && file_exists( $file ) ) { |
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// Add version parameter as a time-stamp in ISO 8601 format, |
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// using Z for the timezone, meaning GMT |
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$url .= '?' . gmdate( 'Y-m-d\TH:i:s\Z', round( filemtime( $file ), -2 ) ); |
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// Embedding requires a bit of extra processing, so let's skip that if we can |
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if ( $embedData && $embed ) { |
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$type = self::getMimeType( $file ); |
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// Detect when URLs were preceeded with embed tags, and also verify file size is |
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// below the limit |
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var_dump($match['embed'], $file, filesize($file)); |
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if ( |
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$type |
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&& $match['embed'][1] > 0 |
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&& filesize( $file ) < self::EMBED_SIZE_LIMIT |
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) { |
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// Strip off any trailing = symbols (makes browsers freak out) |
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$data = base64_encode( file_get_contents( $file ) ); |
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// Build 2 CSS properties; one which uses a base64 encoded data URI in place |
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// of the @embed comment to try and retain line-number integrity, and the |
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// other with a remapped an versioned URL and an Internet Explorer hack |
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// making it ignored in all browsers that support data URIs |
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$replacement = "{$pre}url(data:{$type};base64,{$data}){$post};"; |
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$replacement .= "{$pre}url({$url}){$post}!ie;"; |
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} |
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} |
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if ( $replacement === false ) { |
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// Assume that all paths are relative to $remote, and make them absolute |
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$replacement = "{$embed}{$pre}url({$url}){$post};"; |
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} |
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} elseif ( $local === false ) { |
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// Assume that all paths are relative to $remote, and make them absolute |
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$replacement = "{$embed}{$pre}url({$url}{$query}){$post};"; |
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} |
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if ( $replacement !== false ) { |
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// Perform replacement on the source |
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$source = substr_replace( |
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$source, $replacement, $match[0][1], strlen( $match[0][0] ) |
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); |
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// Move the offset to the end of the replacement in the source |
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$offset = $match[0][1] + strlen( $replacement ); |
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continue; |
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} |
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// Move the offset to the end of the match, leaving it alone |
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$offset = $match[0][1] + strlen( $match[0][0] ); |
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} |
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return $source; |
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} |
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|
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/** |
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* Removes whitespace from CSS data |
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* |
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* @param $css string CSS data to minify |
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* @return string Minified CSS data |
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*/ |
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public static function minify( $css ) { |
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return trim( |
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str_replace( |
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array( '; ', ': ', ' {', '{ ', ', ', '} ', ';}' ), |
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array( ';', ':', '{', '{', ',', '}', '}' ), |
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preg_replace( array( '/\s+/', '/\/\*.*?\*\//s' ), array( ' ', '' ), $css ) |
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) |
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); |
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} |
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} |
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@ -0,0 +1,5 @@ |
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<?php |
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|
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$minimizer = new OC_Minimizer_CSS(); |
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$files = $minimizer->findFiles(OC_Util::$core_styles); |
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$minimizer->output($files); |
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@ -0,0 +1,39 @@ |
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<?php |
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|
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abstract class OC_Minimizer |
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{ |
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protected $files = array(); |
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|
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protected function appendIfExist($root, $webroot, $file) { |
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if (is_file($root.'/'.$file)) { |
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$this->files[] = array($root, $webroot, $file); |
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return true; |
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} |
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return false; |
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} |
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|
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public function getLastModified($files) { |
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$last_modified = 0; |
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foreach($files as $file_info) { |
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$file = $file_info[0] . '/' . $file_info[2]; |
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$filemtime = filemtime($file); |
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if ($filemtime > $last_modified) { |
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$last_modified = $filemtime; |
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} |
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} |
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return $last_modified; |
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} |
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|
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abstract public function minimizeFiles($files); |
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|
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public function output($files) { |
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header('Content-Type: '.$this->contentType); |
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OC_Response::enableCaching(); |
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$last_modified = $this->getLastModified($files); |
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OC_Response::setLastModifiedHeader($last_modified); |
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|
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$out = $this->minimizeFiles($files); |
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header('Content-Length: '.strlen($out)); |
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echo $out; |
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} |
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} |
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@ -0,0 +1,73 @@ |
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<?php |
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|
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require_once('mediawiki/CSSMin.php'); |
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|
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class OC_Minimizer_CSS extends OC_Minimizer |
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{ |
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protected $contentType = 'text/css'; |
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|
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public function findFiles($styles) { |
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// Read the selected theme from the config file |
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$theme=OC_Config::getValue( "theme" ); |
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|
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// Read the detected formfactor and use the right file name. |
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$fext = OC_Template::getFormFactorExtension(); |
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foreach($styles as $style){ |
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// is it in 3rdparty? |
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if($this->appendIfExist(OC::$THIRDPARTYROOT, OC::$THIRDPARTYWEBROOT, $style.'.css')) { |
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|
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// or in apps? |
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}elseif($this->appendIfExist(OC::$APPSROOT, OC::$APPSWEBROOT, "apps/$style$fext.css" )) { |
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}elseif($this->appendIfExist(OC::$APPSROOT, OC::$APPSWEBROOT, "apps/$style.css" )) { |
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|
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// or in the owncloud root? |
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}elseif($this->appendIfExist(OC::$SERVERROOT, OC::$WEBROOT, "$style$fext.css" )) { |
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}elseif($this->appendIfExist(OC::$SERVERROOT, OC::$WEBROOT, "$style.css" )) { |
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|
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// or in core ? |
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}elseif($this->appendIfExist(OC::$SERVERROOT, OC::$WEBROOT, "core/$style$fext.css" )) { |
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}elseif($this->appendIfExist(OC::$SERVERROOT, OC::$WEBROOT, "core/$style.css" )) { |
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|
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}else{ |
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echo('css file not found: style:'.$style.' formfactor:'.$fext.' webroot:'.OC::$WEBROOT.' serverroot:'.OC::$SERVERROOT); |
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die(); |
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} |
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} |
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// Add the theme css files. you can override the default values here |
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if(!empty($theme)) { |
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foreach($styles as $style){ |
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if($this->appendIfExist(OC::$SERVERROOT, OC::$WEBROOT, "themes/$theme/apps/$style$fext.css" )) { |
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}elseif($this->appendIfExist(OC::$SERVERROOT, OC::$WEBROOT, "themes/$theme/apps/$style.css" )) { |
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|
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}elseif($this->appendIfExist(OC::$SERVERROOT, OC::$WEBROOT, "themes/$theme/$style$fext.css" )) { |
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}elseif($this->appendIfExist(OC::$SERVERROOT, OC::$WEBROOT, "themes/$theme/$style.css" )) { |
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|
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}elseif($this->appendIfExist(OC::$SERVERROOT, OC::$WEBROOT, "themes/$theme/core/$style$fext.css" )) { |
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}elseif($this->appendIfExist(OC::$SERVERROOT, OC::$WEBROOT, "themes/$theme/core/$style.css" )) { |
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} |
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} |
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} |
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return $this->files; |
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} |
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|
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public function minimizeFiles($files) { |
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$css_out = ''; |
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$appswebroot = (string) OC::$APPSWEBROOT; |
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$webroot = (string) OC::$WEBROOT; |
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foreach($files as $file_info) { |
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$file = $file_info[0] . '/' . $file_info[2]; |
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$css_out .= '/* ' . $file . ' */' . "\n"; |
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$css = file_get_contents($file); |
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if (strpos($file, OC::$APPSROOT) == 0) { |
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$css = str_replace('%appswebroot%', $appswebroot, $css); |
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$css = str_replace('%webroot%', $webroot, $css); |
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} |
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$remote = $file_info[1]; |
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$remote .= '../'; |
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$remote .= dirname($file_info[2]); |
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$css_out .= CSSMin::remap($css, dirname($file), $remote, true); |
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} |
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$css_out = CSSMin::minify($css_out); |
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return $css_out; |
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} |
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} |
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