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<?php
namespace MediaWiki;
use BagOStuff;
use Hooks;
use MalformedTitleException;
use MediaWiki\Linker\LinkTarget;
use RepoGroup;
use TitleParser;
class BadFileLookup {
/** @var callable Returns contents of blacklist (see comment for isBadFile()) */
private $blacklistCallback;
/** @var BagOStuff Cache of parsed bad image list */
private $cache;
/** @var RepoGroup */
private $repoGroup;
/** @var TitleParser */
private $titleParser;
/** @var array|null Parsed blacklist */
private $badFiles;
/**
* Do not call directly. Use MediaWikiServices.
*
* @param callable $blacklistCallback Callback that returns wikitext of a file blacklist
* @param BagOStuff $cache For caching parsed versions of the blacklist
* @param RepoGroup $repoGroup
* @param TitleParser $titleParser
*/
public function __construct(
callable $blacklistCallback,
BagOStuff $cache,
RepoGroup $repoGroup,
TitleParser $titleParser
) {
$this->blacklistCallback = $blacklistCallback;
$this->cache = $cache;
$this->repoGroup = $repoGroup;
$this->titleParser = $titleParser;
}
/**
* Determine if a file exists on the 'bad image list'.
*
* The format of MediaWiki:Bad_image_list is as follows:
* * Only list items (lines starting with "*") are considered
* * The first link on a line must be a link to a bad file
* * Any subsequent links on the same line are considered to be exceptions,
* i.e. articles where the file may occur inline.
*
* @param string $name The file name to check
* @param LinkTarget|null $contextTitle The page on which the file occurs, if known
* @return bool
*/
public function isBadFile( $name, LinkTarget $contextTitle = null ) {
// Handle redirects; callers almost always hit RepoGroup::findFile() anyway,
// so just use that method because it has a fast process cache.
$file = $this->repoGroup->findFile( $name );
// XXX If we don't find the file we also don't replace spaces by underscores or otherwise
// validate or normalize the title, is this right?
if ( $file ) {
$name = $file->getTitle()->getDBkey();
}
// Run the extension hook
$bad = false;
if ( !Hooks::run( 'BadImage', [ $name, &$bad ] ) ) {
return (bool)$bad;
}
if ( $this->badFiles === null ) {
// Not used before in this request, try the cache
$blacklist = ( $this->blacklistCallback )();
$key = $this->cache->makeKey( 'bad-image-list', sha1( $blacklist ) );
$this->badFiles = $this->cache->get( $key ) ?: null;
}
if ( $this->badFiles === null ) {
// Cache miss, build the list now
$this->badFiles = [];
$lines = explode( "\n", $blacklist );
foreach ( $lines as $line ) {
// List items only
if ( substr( $line, 0, 1 ) !== '*' ) {
continue;
}
// Find all links
$m = [];
// XXX What is the ':?' doing in the regex? Why not let the TitleParser strip it?
if ( !preg_match_all( '/\[\[:?(.*?)\]\]/', $line, $m ) ) {
continue;
}
$fileDBkey = null;
$exceptions = [];
foreach ( $m[1] as $i => $titleText ) {
try {
$title = $this->titleParser->parseTitle( $titleText );
} catch ( MalformedTitleException $e ) {
continue;
}
if ( $i == 0 ) {
$fileDBkey = $title->getDBkey();
} else {
$exceptions[$title->getNamespace()][$title->getDBkey()] = true;
}
}
if ( $fileDBkey !== null ) {
$this->badFiles[$fileDBkey] = $exceptions;
}
}
$this->cache->set( $key, $this->badFiles, 24 * 60 * 60 );
}
return isset( $this->badFiles[$name] ) && ( !$contextTitle ||
!isset( $this->badFiles[$name][$contextTitle->getNamespace()]
[$contextTitle->getDBkey()] ) );
}
}
|
