ImageFunctions.php

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<?php
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;
}