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<?php
/**
* Global functions related to images
*
* @file
*/
/**
* Determine if an image 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 image
* * Any subsequent links on the same line are considered to be exceptions,
* i.e. articles where the image may occur inline.
*
* @param $name string the image name to check
* @param $contextTitle Title|bool the page on which the image occurs, if known
* @param $blacklist string wikitext of a file blacklist
* @return bool
*/
function wfIsBadImage( $name, $contextTitle = false, $blacklist = null ) {
static $badImageCache = null; // based on bad_image_list msg
wfProfileIn( __METHOD__ );
# Handle redirects
$redirectTitle = RepoGroup::singleton()->checkRedirect( Title::makeTitle( NS_FILE, $name ) );
if( $redirectTitle ) {
$name = $redirectTitle->getDbKey();
}
# Run the extension hook
$bad = false;
if( !wfRunHooks( 'BadImage', array( $name, &$bad ) ) ) {
wfProfileOut( __METHOD__ );
return $bad;
}
$cacheable = ( $blacklist === null );
if( $cacheable && $badImageCache !== null ) {
$badImages = $badImageCache;
} else { // cache miss
if ( $blacklist === null ) {
$blacklist = wfMsgForContentNoTrans( 'bad_image_list' ); // site list
}
# Build the list now
$badImages = array();
$lines = explode( "\n", $blacklist );
foreach( $lines as $line ) {
# List items only
if ( substr( $line, 0, 1 ) !== '*' ) {
continue;
}
# Find all links
$m = array();
if ( !preg_match_all( '/\[\[:?(.*?)\]\]/', $line, $m ) ) {
continue;
}
$exceptions = array();
$imageDBkey = false;
foreach ( $m[1] as $i => $titleText ) {
$title = Title::newFromText( $titleText );
if ( !is_null( $title ) ) {
if ( $i == 0 ) {
$imageDBkey = $title->getDBkey();
} else {
$exceptions[$title->getPrefixedDBkey()] = true;
}
}
}
if ( $imageDBkey !== false ) {
$badImages[$imageDBkey] = $exceptions;
}
}
if ( $cacheable ) {
$badImageCache = $badImages;
}
}
$contextKey = $contextTitle ? $contextTitle->getPrefixedDBkey() : false;
$bad = isset( $badImages[$name] ) && !isset( $badImages[$name][$contextKey] );
wfProfileOut( __METHOD__ );
return $bad;
}
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