Merge "Follow-up I774a89d6 (2fabea7): use $this->msg() in HistoryAction"

[mediawiki.git] / includes / resourceloader / ResourceLoaderFileModule.php

<?php
/**
 * Resource loader module based on local JavaScript/CSS files.
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @author Trevor Parscal
 * @author Roan Kattouw
 */

/**
 * ResourceLoader module based on local JavaScript/CSS files.
 */
class ResourceLoaderFileModule extends ResourceLoaderModule {

        /* Protected Members */

        /** String: Local base path, see __construct() */
        protected $localBasePath = '';
        /** String: Remote base path, see __construct() */
        protected $remoteBasePath = '';
        /**
         * Array: List of paths to JavaScript files to always include
         * @par Usage:
         * @code
         * array( [file-path], [file-path], ... )
         * @endcode
         */
        protected $scripts = array();
        /**
         * Array: List of JavaScript files to include when using a specific language
         * @par Usage:
         * @code
         * array( [language-code] => array( [file-path], [file-path], ... ), ... )
         * @endcode
         */
        protected $languageScripts = array();
        /**
         * Array: List of JavaScript files to include when using a specific skin
         * @par Usage:
         * @code
         * array( [skin-name] => array( [file-path], [file-path], ... ), ... )
         * @endcode
         */
        protected $skinScripts = array();
        /**
         * Array: List of paths to JavaScript files to include in debug mode
         * @par Usage:
         * @code
         * array( [skin-name] => array( [file-path], [file-path], ... ), ... )
         * @endcode
         */
        protected $debugScripts = array();
        /**
         * Array: List of paths to JavaScript files to include in the startup module
         * @par Usage:
         * @code
         * array( [file-path], [file-path], ... )
         * @endcode
         */
        protected $loaderScripts = array();
        /**
         * Array: List of paths to CSS files to always include
         * @par Usage:
         * @code
         * array( [file-path], [file-path], ... )
         * @endcode
         */
        protected $styles = array();
        /**
         * Array: List of paths to CSS files to include when using specific skins
         * @par Usage:
         * @code
         * array( [file-path], [file-path], ... )
         * @endcode
         */
        protected $skinStyles = array();
        /**
         * Array: List of modules this module depends on
         * @par Usage:
         * @code
         * array( [file-path], [file-path], ... )
         * @endcode
         */
        protected $dependencies = array();
        /**
         * Array: List of message keys used by this module
         * @par Usage:
         * @code
         * array( [message-key], [message-key], ... )
         * @endcode
         */
        protected $messages = array();
        /** String: Name of group to load this module in */
        protected $group;
        /** String: Position on the page to load this module at */
        protected $position = 'bottom';
        /** Boolean: Link to raw files in debug mode */
        protected $debugRaw = true;
        /** Boolean: Whether mw.loader.state() call should be omitted */
        protected $raw = false;
        /**
         * Array: Cache for mtime
         * @par Usage:
         * @code
         * array( [hash] => [mtime], [hash] => [mtime], ... )
         * @endcode
         */
        protected $modifiedTime = array();
        /**
         * Array: Place where readStyleFile() tracks file dependencies
         * @par Usage:
         * @code
         * array( [file-path], [file-path], ... )
         * @endcode
         */
        protected $localFileRefs = array();

        /* Methods */

        /**
         * Constructs a new module from an options array.
         *
         * @param $options Array: List of options; if not given or empty, an empty module will be
         *     constructed
         * @param $localBasePath String: Base path to prepend to all local paths in $options. Defaults
         *     to $IP
         * @param $remoteBasePath String: Base path to prepend to all remote paths in $options. Defaults
         *     to $wgScriptPath
         *
         * Below is a description for the $options array:
         * @par Construction options:
         * @code
         *      array(
         *              // Base path to prepend to all local paths in $options. Defaults to $IP
         *              'localBasePath' => [base path],
         *              // Base path to prepend to all remote paths in $options. Defaults to $wgScriptPath
         *              'remoteBasePath' => [base path],
         *              // Equivalent of remoteBasePath, but relative to $wgExtensionAssetsPath
         *              'remoteExtPath' => [base path],
         *              // Scripts to always include
         *              'scripts' => [file path string or array of file path strings],
         *              // Scripts to include in specific language contexts
         *              'languageScripts' => array(
         *                      [language code] => [file path string or array of file path strings],
         *              ),
         *              // Scripts to include in specific skin contexts
         *              'skinScripts' => array(
         *                      [skin name] => [file path string or array of file path strings],
         *              ),
         *              // Scripts to include in debug contexts
         *              'debugScripts' => [file path string or array of file path strings],
         *              // Scripts to include in the startup module
         *              'loaderScripts' => [file path string or array of file path strings],
         *              // Modules which must be loaded before this module
         *              'dependencies' => [modile name string or array of module name strings],
         *              // Styles to always load
         *              'styles' => [file path string or array of file path strings],
         *              // Styles to include in specific skin contexts
         *              'skinStyles' => array(
         *                      [skin name] => [file path string or array of file path strings],
         *              ),
         *              // Messages to always load
         *              'messages' => [array of message key strings],
         *              // Group which this module should be loaded together with
         *              'group' => [group name string],
         *              // Position on the page to load this module at
         *              'position' => ['bottom' (default) or 'top']
         *      )
         * @endcode
         */
        public function __construct( $options = array(), $localBasePath = null,
                $remoteBasePath = null )
        {
                global $IP, $wgScriptPath, $wgResourceBasePath;
                $this->localBasePath = $localBasePath === null ? $IP : $localBasePath;
                if ( $remoteBasePath !== null ) {
                        $this->remoteBasePath = $remoteBasePath;
                } else {
                        $this->remoteBasePath = $wgResourceBasePath === null ? $wgScriptPath : $wgResourceBasePath;
                }

                if ( isset( $options['remoteExtPath'] ) ) {
                        global $wgExtensionAssetsPath;
                        $this->remoteBasePath = $wgExtensionAssetsPath . '/' . $options['remoteExtPath'];
                }

                foreach ( $options as $member => $option ) {
                        switch ( $member ) {
                                // Lists of file paths
                                case 'scripts':
                                case 'debugScripts':
                                case 'loaderScripts':
                                case 'styles':
                                        $this->{$member} = (array) $option;
                                        break;
                                // Collated lists of file paths
                                case 'languageScripts':
                                case 'skinScripts':
                                case 'skinStyles':
                                        if ( !is_array( $option ) ) {
                                                throw new MWException(
                                                        "Invalid collated file path list error. " .
                                                        "'$option' given, array expected."
                                                );
                                        }
                                        foreach ( $option as $key => $value ) {
                                                if ( !is_string( $key ) ) {
                                                        throw new MWException(
                                                                "Invalid collated file path list key error. " .
                                                                "'$key' given, string expected."
                                                        );
                                                }
                                                $this->{$member}[$key] = (array) $value;
                                        }
                                        break;
                                // Lists of strings
                                case 'dependencies':
                                case 'messages':
                                        $this->{$member} = (array) $option;
                                        break;
                                // Single strings
                                case 'group':
                                case 'position':
                                case 'localBasePath':
                                case 'remoteBasePath':
                                        $this->{$member} = (string) $option;
                                        break;
                                // Single booleans
                                case 'debugRaw':
                                case 'raw':
                                        $this->{$member} = (bool) $option;
                                        break;
                        }
                }
                // Make sure the remote base path is a complete valid URL,
                // but possibly protocol-relative to avoid cache pollution
                $this->remoteBasePath = wfExpandUrl( $this->remoteBasePath, PROTO_RELATIVE );
        }

        /**
         * Gets all scripts for a given context concatenated together.
         *
         * @param $context ResourceLoaderContext: Context in which to generate script
         * @return String: JavaScript code for $context
         */
        public function getScript( ResourceLoaderContext $context ) {
                $files = $this->getScriptFiles( $context );
                return $this->readScriptFiles( $files );
        }

        /**
         * @param $context ResourceLoaderContext
         * @return array
         */
        public function getScriptURLsForDebug( ResourceLoaderContext $context ) {
                $urls = array();
                foreach ( $this->getScriptFiles( $context ) as $file ) {
                        $urls[] = $this->getRemotePath( $file );
                }
                return $urls;
        }

        /**
         * @return bool
         */
        public function supportsURLLoading() {
                return $this->debugRaw;
        }

        /**
         * Gets loader script.
         *
         * @return String: JavaScript code to be added to startup module
         */
        public function getLoaderScript() {
                if ( count( $this->loaderScripts ) == 0 ) {
                        return false;
                }
                return $this->readScriptFiles( $this->loaderScripts );
        }

        /**
         * Gets all styles for a given context concatenated together.
         *
         * @param $context ResourceLoaderContext: Context in which to generate styles
         * @return String: CSS code for $context
         */
        public function getStyles( ResourceLoaderContext $context ) {
                $styles = $this->readStyleFiles(
                        $this->getStyleFiles( $context ),
                        $this->getFlip( $context )
                );
                // Collect referenced files
                $this->localFileRefs = array_unique( $this->localFileRefs );
                // If the list has been modified since last time we cached it, update the cache
                if ( $this->localFileRefs !== $this->getFileDependencies( $context->getSkin() ) && !wfReadOnly() ) {
                        $dbw = wfGetDB( DB_MASTER );
                        $dbw->replace( 'module_deps',
                                array( array( 'md_module', 'md_skin' ) ), array(
                                        'md_module' => $this->getName(),
                                        'md_skin' => $context->getSkin(),
                                        'md_deps' => FormatJson::encode( $this->localFileRefs ),
                                )
                        );
                }
                return $styles;
        }

        /**
         * @param $context ResourceLoaderContext
         * @return array
         */
        public function getStyleURLsForDebug( ResourceLoaderContext $context ) {
                $urls = array();
                foreach ( $this->getStyleFiles( $context ) as $mediaType => $list ) {
                        $urls[$mediaType] = array();
                        foreach ( $list as $file ) {
                                $urls[$mediaType][] = $this->getRemotePath( $file );
                        }
                }
                return $urls;
        }

        /**
         * Gets list of message keys used by this module.
         *
         * @return Array: List of message keys
         */
        public function getMessages() {
                return $this->messages;
        }

        /**
         * Gets the name of the group this module should be loaded in.
         *
         * @return String: Group name
         */
        public function getGroup() {
                return $this->group;
        }

        /**
         * @return string
         */
        public function getPosition() {
                return $this->position;
        }

        /**
         * Gets list of names of modules this module depends on.
         *
         * @return Array: List of module names
         */
        public function getDependencies() {
                return $this->dependencies;
        }

        /**
         * @return bool
         */
        public function isRaw() {
                return $this->raw;
        }

        /**
         * Get the last modified timestamp of this module.
         *
         * Last modified timestamps are calculated from the highest last modified
         * timestamp of this module's constituent files as well as the files it
         * depends on. This function is context-sensitive, only performing
         * calculations on files relevant to the given language, skin and debug
         * mode.
         *
         * @param $context ResourceLoaderContext: Context in which to calculate
         *     the modified time
         * @return Integer: UNIX timestamp
         * @see ResourceLoaderModule::getFileDependencies
         */
        public function getModifiedTime( ResourceLoaderContext $context ) {
                if ( isset( $this->modifiedTime[$context->getHash()] ) ) {
                        return $this->modifiedTime[$context->getHash()];
                }
                wfProfileIn( __METHOD__ );

                $files = array();

                // Flatten style files into $files
                $styles = self::collateFilePathListByOption( $this->styles, 'media', 'all' );
                foreach ( $styles as $styleFiles ) {
                        $files = array_merge( $files, $styleFiles );
                }
                $skinFiles = self::tryForKey(
                        self::collateFilePathListByOption( $this->skinStyles, 'media', 'all' ),
                        $context->getSkin(),
                        'default'
                );
                foreach ( $skinFiles as $styleFiles ) {
                        $files = array_merge( $files, $styleFiles );
                }

                // Final merge, this should result in a master list of dependent files
                $files = array_merge(
                        $files,
                        $this->scripts,
                        $context->getDebug() ? $this->debugScripts : array(),
                        self::tryForKey( $this->languageScripts, $context->getLanguage() ),
                        self::tryForKey( $this->skinScripts, $context->getSkin(), 'default' ),
                        $this->loaderScripts
                );
                $files = array_map( array( $this, 'getLocalPath' ), $files );
                // File deps need to be treated separately because they're already prefixed
                $files = array_merge( $files, $this->getFileDependencies( $context->getSkin() ) );

                // If a module is nothing but a list of dependencies, we need to avoid
                // giving max() an empty array
                if ( count( $files ) === 0 ) {
                        wfProfileOut( __METHOD__ );
                        return $this->modifiedTime[$context->getHash()] = 1;
                }

                wfProfileIn( __METHOD__.'-filemtime' );
                $filesMtime = max( array_map( array( __CLASS__, 'safeFilemtime' ), $files ) );
                wfProfileOut( __METHOD__.'-filemtime' );
                $this->modifiedTime[$context->getHash()] = max(
                        $filesMtime,
                        $this->getMsgBlobMtime( $context->getLanguage() ) );

                wfProfileOut( __METHOD__ );
                return $this->modifiedTime[$context->getHash()];
        }

        /* Protected Methods */

        /**
         * @param $path string
         * @return string
         */
        protected function getLocalPath( $path ) {
                return "{$this->localBasePath}/$path";
        }

        /**
         * @param $path string
         * @return string
         */
        protected function getRemotePath( $path ) {
                return "{$this->remoteBasePath}/$path";
        }

        /**
         * Collates file paths by option (where provided).
         *
         * @param $list Array: List of file paths in any combination of index/path
         *     or path/options pairs
         * @param $option String: option name
         * @param $default Mixed: default value if the option isn't set
         * @return Array: List of file paths, collated by $option
         */
        protected static function collateFilePathListByOption( array $list, $option, $default ) {
                $collatedFiles = array();
                foreach ( (array) $list as $key => $value ) {
                        if ( is_int( $key ) ) {
                                // File name as the value
                                if ( !isset( $collatedFiles[$default] ) ) {
                                        $collatedFiles[$default] = array();
                                }
                                $collatedFiles[$default][] = $value;
                        } elseif ( is_array( $value ) ) {
                                // File name as the key, options array as the value
                                $optionValue = isset( $value[$option] ) ? $value[$option] : $default;
                                if ( !isset( $collatedFiles[$optionValue] ) ) {
                                        $collatedFiles[$optionValue] = array();
                                }
                                $collatedFiles[$optionValue][] = $key;
                        }
                }
                return $collatedFiles;
        }

        /**
         * Gets a list of element that match a key, optionally using a fallback key.
         *
         * @param $list Array: List of lists to select from
         * @param $key String: Key to look for in $map
         * @param $fallback String: Key to look for in $list if $key doesn't exist
         * @return Array: List of elements from $map which matched $key or $fallback,
         *     or an empty list in case of no match
         */
        protected static function tryForKey( array $list, $key, $fallback = null ) {
                if ( isset( $list[$key] ) && is_array( $list[$key] ) ) {
                        return $list[$key];
                } elseif ( is_string( $fallback )
                        && isset( $list[$fallback] )
                        && is_array( $list[$fallback] ) )
                {
                        return $list[$fallback];
                }
                return array();
        }

        /**
         * Gets a list of file paths for all scripts in this module, in order of propper execution.
         *
         * @param $context ResourceLoaderContext: Context
         * @return Array: List of file paths
         */
        protected function getScriptFiles( ResourceLoaderContext $context ) {
                $files = array_merge(
                        $this->scripts,
                        self::tryForKey( $this->languageScripts, $context->getLanguage() ),
                        self::tryForKey( $this->skinScripts, $context->getSkin(), 'default' )
                );
                if ( $context->getDebug() ) {
                        $files = array_merge( $files, $this->debugScripts );
                }
                return $files;
        }

        /**
         * Gets a list of file paths for all styles in this module, in order of propper inclusion.
         *
         * @param $context ResourceLoaderContext: Context
         * @return Array: List of file paths
         */
        protected function getStyleFiles( ResourceLoaderContext $context ) {
                return array_merge_recursive(
                        self::collateFilePathListByOption( $this->styles, 'media', 'all' ),
                        self::collateFilePathListByOption(
                                self::tryForKey( $this->skinStyles, $context->getSkin(), 'default' ), 'media', 'all'
                        )
                );
        }

        /**
         * Gets the contents of a list of JavaScript files.
         *
         * @param $scripts Array: List of file paths to scripts to read, remap and concetenate
         * @return String: Concatenated and remapped JavaScript data from $scripts
         */
        protected function readScriptFiles( array $scripts ) {
                global $wgResourceLoaderValidateStaticJS;
                if ( empty( $scripts ) ) {
                        return '';
                }
                $js = '';
                foreach ( array_unique( $scripts ) as $fileName ) {
                        $localPath = $this->getLocalPath( $fileName );
                        if ( !file_exists( $localPath ) ) {
                                throw new MWException( __METHOD__.": script file not found: \"$localPath\"" );
                        }
                        $contents = file_get_contents( $localPath );
                        if ( $wgResourceLoaderValidateStaticJS ) {
                                // Static files don't really need to be checked as often; unlike
                                // on-wiki module they shouldn't change unexpectedly without
                                // admin interference.
                                $contents = $this->validateScriptFile( $fileName, $contents );
                        }
                        $js .= $contents . "\n";
                }
                return $js;
        }

        /**
         * Gets the contents of a list of CSS files.
         *
         * @param $styles Array: List of media type/list of file paths pairs, to read, remap and
         * concetenate
         *
         * @param $flip bool
         *
         * @return Array: List of concatenated and remapped CSS data from $styles,
         *     keyed by media type
         */
        protected function readStyleFiles( array $styles, $flip ) {
                if ( empty( $styles ) ) {
                        return array();
                }
                foreach ( $styles as $media => $files ) {
                        $uniqueFiles = array_unique( $files );
                        $styles[$media] = implode(
                                "\n",
                                array_map(
                                        array( $this, 'readStyleFile' ),
                                        $uniqueFiles,
                                        array_fill( 0, count( $uniqueFiles ), $flip )
                                )
                        );
                }
                return $styles;
        }

        /**
         * Reads a style file.
         *
         * This method can be used as a callback for array_map()
         *
         * @param $path String: File path of style file to read
         * @param $flip bool
         *
         * @return String: CSS data in script file
         * @throws MWException if the file doesn't exist
         */
        protected function readStyleFile( $path, $flip ) {
                $localPath = $this->getLocalPath( $path );
                if ( !file_exists( $localPath ) ) {
                        throw new MWException( __METHOD__.": style file not found: \"$localPath\"" );
                }
                $style = file_get_contents( $localPath );
                if ( $flip ) {
                        $style = CSSJanus::transform( $style, true, false );
                }
                $dirname = dirname( $path );
                if ( $dirname == '.' ) {
                        // If $path doesn't have a directory component, don't prepend a dot
                        $dirname = '';
                }
                $dir = $this->getLocalPath( $dirname );
                $remoteDir = $this->getRemotePath( $dirname );
                // Get and register local file references
                $this->localFileRefs = array_merge(
                        $this->localFileRefs,
                        CSSMin::getLocalFileReferences( $style, $dir ) );
                return CSSMin::remap(
                        $style, $dir, $remoteDir, true
                );
        }

        /**
         * Safe version of filemtime(), which doesn't throw a PHP warning if the file doesn't exist
         * but returns 1 instead.
         * @param $filename string File name
         * @return int UNIX timestamp, or 1 if the file doesn't exist
         */
        protected static function safeFilemtime( $filename ) {
                if ( file_exists( $filename ) ) {
                        return filemtime( $filename );
                } else {
                        // We only ever map this function on an array if we're gonna call max() after,
                        // so return our standard minimum timestamps here. This is 1, not 0, because
                        // wfTimestamp(0) == NOW
                        return 1;
                }
        }

        /**
         * Get whether CSS for this module should be flipped
         * @param $context ResourceLoaderContext
         * @return bool
         */
        public function getFlip( $context ) {
                return $context->getDirection() === 'rtl';
        }
}