ImagePage.php

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User:Scott made some modifications to ImagePage.php, so when following redirects from image pages, the image is not displayed.

<?php
/**
 * @package MediaWiki
 */

/**
 *
 */
if( !defined( 'MEDIAWIKI' ) )
    die();

require_once( 'Image.php' );

/**
 * Special handling for image description pages
 * @package MediaWiki
 */
class ImagePage extends Article {

    /* private */ var $img;  // Image object this page is shown for. Initilaized in openShowImage, not
                 // available in doDelete etc.

    function view() {
        if ( Namespace::getImage() == $this->mTitle->getNamespace() ) {
            $this->openShowImage();
        }

        Article::view();

        # If the article we've just shown is in the "Image" namespace,
        # follow it with the history list and link list for the image
        # it describes.

        if ( Namespace::getImage() == $this->mTitle->getNamespace() ) {
            $this->closeShowImage();
            $this->imageHistory();
            $this->imageLinks();
        }
    }

    function openShowImage()
    {
        global $wgOut, $wgUser, $wgImageLimits, $wgRequest, $wgUseImageResize;
        $this->img  = Image::newFromTitle( $this->mTitle );
        $full_url  = $this->img->getViewURL();
        $anchoropen = '';
        $anchorclose = '';

        if( $wgUser->getOption( 'imagesize' ) == '' ) {
            $sizeSel = User::getDefaultOption( 'imagesize' );
        } else {
            $sizeSel = IntVal( $wgUser->getOption( 'imagesize' ) );
        }
        if( !isset( $wgImageLimits[$sizeSel] ) ) {
            $sizeSel = User::getDefaultOption( 'imagesize' );
        }
        $max = $wgImageLimits[$sizeSel];
        $maxWidth = $max[0];
        $maxHeight = $max[1];


        if ( $this->img->exists() ) {

            $sk = $wgUser->getSkin();

            if ( $this->img->getType() != '' ) {
                # image
                $width = $this->img->getWidth();
                $height = $this->img->getHeight();
                $msg = wfMsg('showbigimage', $width, $height, intval( $this->img->getSize()/1024 ) );
                if ( $width > $maxWidth ) {
                    $height = floor( $height * $maxWidth / $width );
                    $width  = $maxWidth;
                }
                if ( $height > $maxHeight ) {
                    $width = floor( $width * $maxHeight / $height );
                    $height = $maxHeight;
                }
                if ( $width != $this->img->getWidth() || $height != $this->img->getHeight() ) {
                    if( $wgUseImageResize ) {
                        $thumbnail = $this->img->getThumbnail( $width );
                        if (    ( $thumbnail == null )
                             || ( ( ! $this->img->mustRender() )
                                  && ( $thumbnail->getSize() > $this->img->getSize() ) ) ) {
                            # the thumbnail is bigger thatn the original image.
                            # show the original image instead of the thumb.
                            $url = $full_url;
                            $width = $this->img->getWidth();
                            $height = $this->img->getHeight();
                        } else {
                            $url = $thumbnail->getUrl();
                        }
                    } else {
                        # No resize ability? Show the full image, but scale
                        # it down in the browser so it fits on the page.
                        $url = $full_url;
                    }
                    $anchoropen  = "<a href=\"{$full_url}\">";
                    $anchorclose = "</a><br />\n$anchoropen{$msg}</a>";
                } else {
                    $url = $full_url;
                }
# Changes by Scott Morrison, Aug 30, 2005. No rights reserved.
# try to determine if the image page we're on contains an image, without messing anything else up!
#       this is a hack, and someone who knows better should fix it!
#       in particular, the literal string "Image:" needs to be fixed.
                $pageTitle = $this->getTitle();
                $pageTitle = $pageTitle->getText();
                $article = & new Article( Title::newFromText( "Image:".$pageTitle ) );
                $content = $article->getContent( true );
# now if we've been specifically asked not to redirect, or we're on a normal image page, or , show the image
# otherwise, we're about to be redirected somewhere else, so don't show the image!
                if($wgRequest->getVal( 'redirect' ) == 'no' || substr($content, 0 , 9) != '#REDIRECT') {
                   $s = '<div class="fullImageLink">' . $anchoropen .
                     "<img border=\"0\" src=\"{$url}\" width=\"{$width}\" height=\"{$height}\" alt=\"" .
                     htmlspecialchars( $wgRequest->getVal( 'image' ) ).'" />' . $anchorclose . '</div>';
                } else {
                    $s = '';
                }
            } else {
                $s = "<div class=\"fullMedia\">" . $sk->makeMediaLink( $this->img->getName(),'' ) . '</div>';
            }
            $wgOut->addHTML( $s );
            if($this->img->fromSharedDirectory) {
                $wgOut->addWikiText("<div class=\"sharedUploadNotice\">".wfMsg("sharedupload")."</div>");
            }
        }
    }

    function closeShowImage()
    {
        # For overloading
    }

    /**
     * If the page we've just displayed is in the "Image" namespace,
     * we follow it with an upload history of the image and its usage.
     */
    function imageHistory()
    {
        global $wgUser, $wgOut;

        $sk = $wgUser->getSkin();

        $line = $this->img->nextHistoryLine();

        if ( $line ) {
            $list =& new ImageHistoryList( $sk );
            $s = $list->beginImageHistoryList() .
                $list->imageHistoryLine( true, $line->img_timestamp,
                    $this->mTitle->getDBkey(),  $line->img_user,
                    $line->img_user_text, $line->img_size, $line->img_description );

            while ( $line = $this->img->nextHistoryLine() ) {
                $s .= $list->imageHistoryLine( false, $line->img_timestamp,
                $line->oi_archive_name, $line->img_user,
                $line->img_user_text, $line->img_size, $line->img_description );
            }
            $s .= $list->endImageHistoryList();
        } else { $s=''; }
        $wgOut->addHTML( $s );
    }

    function imageLinks()
    {
        global $wgUser, $wgOut;

        $wgOut->addHTML( '<h2>' . wfMsg( 'imagelinks' ) . "</h2>\n" );

        $dbr =& wfGetDB( DB_SLAVE );
        $cur = $dbr->tableName( 'cur' );
        $imagelinks = $dbr->tableName( 'imagelinks' );

        $sql = "SELECT cur_namespace,cur_title FROM $imagelinks,$cur WHERE il_to=" .
          $dbr->addQuotes( $this->mTitle->getDBkey() ) . " AND il_from=cur_id"
          . " LIMIT 500"; # quickie emergency brake
        $res = $dbr->query( $sql, "ImagePage::imageLinks" );

        if ( 0 == $dbr->numRows( $res ) ) {
            $wgOut->addHtml( '<p>' . wfMsg( "nolinkstoimage" ) . "</p>\n" );
            return;
        }
        $wgOut->addHTML( '<p>' . wfMsg( 'linkstoimage' ) .  "</p>\n<ul>" );

        $sk = $wgUser->getSkin();
        while ( $s = $dbr->fetchObject( $res ) ) {
            $name = Title::MakeTitle( $s->cur_namespace, $s->cur_title );
            $link = $sk->makeKnownLinkObj( $name, "" );
            $wgOut->addHTML( "<li>{$link}</li>\n" );
        }
        $wgOut->addHTML( "</ul>\n" );
    }

    function delete()
    {
        global $wgUser, $wgOut, $wgRequest;

        $confirm = $wgRequest->getBool( 'wpConfirm' );
        $image = $wgRequest->getVal( 'image' );
        $oldimage = $wgRequest->getVal( 'oldimage' );

        # Only sysops can delete images. Previously ordinary users could delete
        # old revisions, but this is no longer the case.
        if ( !$wgUser->isAllowed('delete') ) {
            $wgOut->sysopRequired();
            return;
        }
        if ( $wgUser->isBlocked() ) {
            return $this->blockedIPpage();
        }
        if ( wfReadOnly() ) {
            $wgOut->readOnlyPage();
            return;
        }

        # Better double-check that it hasn't been deleted yet!
        $wgOut->setPagetitle( wfMsg( 'confirmdelete' ) );
        if ( !is_null( $image ) ) {
            if ( '' == trim( $image ) ) {
                $wgOut->fatalError( wfMsg( 'cannotdelete' ) );
                return;
            }
        }

        # Deleting old images doesn't require confirmation
        if ( !is_null( $oldimage ) || $confirm ) {
            if( $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ), $oldimage ) ) {
                $this->doDelete();
            } else {
                $wgOut->fatalError( wfMsg( 'sessionfailure' ) );
            }
            return;
        }

        if ( !is_null( $image ) ) {
            $q = '&image=' . urlencode( $image );
        } else if ( !is_null( $oldimage ) ) {
            $q = '&oldimage=' . urlencode( $oldimage );
        } else {
            $q = '';
        }
        return $this->confirmDelete( $q, $wgRequest->getText( 'wpReason' ) );
    }

    function doDelete()
    {
        global $wgOut, $wgUser, $wgContLang, $wgRequest;
        global $wgUseSquid, $wgInternalServer, $wgDeferredUpdateList;
        $fname = 'ImagePage::doDelete';

        $reason = $wgRequest->getVal( 'wpReason' );
        $oldimage = $wgRequest->getVal( 'oldimage' );

        $dbw =& wfGetDB( DB_MASTER );

        if ( !is_null( $oldimage ) ) {
            if ( strlen( $oldimage ) < 16 ) {
                $wgOut->unexpectedValueError( 'oldimage', htmlspecialchars($oldimage) );
                return;
            }
            if ( strstr( $oldimage, "/" ) || strstr( $oldimage, "\\" ) ) {
                $wgOut->unexpectedValueError( 'oldimage', htmlspecialchars($oldimage) );
                return;
            }
            # Squid purging
            if ( $wgUseSquid ) {
                $archUrl = wfImageArchiveUrl( $oldimage );
                # don't prefix with internal server if we share one (-> Commons)
                $prefix = preg_match("/^http:\/\//",$archUrl) ? '' : $wgInternalServer;
                $urlArr = Array(
                    $prefix.$archUrl
                );
                wfPurgeSquidServers($urlArr);
            }
            $this->doDeleteOldImage( $oldimage );
            $dbw->delete( 'oldimage', array( 'oi_archive_name' => $oldimage ) );
            $deleted = $oldimage;
        } else {
            $image = $this->mTitle->getDBkey();
            $dest = wfImageDir( $image );
            $archive = wfImageDir( $image );

            # Delete the image file if it exists; due to sync problems
            # or manual trimming sometimes the file will be missing.
            $targetFile = "{$dest}/{$image}";
            if( file_exists( $targetFile ) && ! @unlink( $targetFile ) ) {
                # If the deletion operation actually failed, bug out:
                $wgOut->fileDeleteError( $targetFile );
                return;
            }
            $dbw->delete( 'image', array( 'img_name' => $image ) );
            $res = $dbw->select( 'oldimage', array( 'oi_archive_name' ), array( 'oi_name' => $image ) );

            # Squid purging
            if ( $wgUseSquid ) {
                $curUrl = Image::wfImageUrl( $image );
                # don't prefix with internal server if we share one (-> Commons)
                $prefix = preg_match("/^http:\/\//",$curUrl) ? '' : $wgInternalServer;
                $urlArr = Array(
                    $prefix.$curUrl
                );
                wfPurgeSquidServers($urlArr);
            }


            $urlArr = Array();
            while ( $s = $dbw->fetchObject( $res ) ) {
                $this->doDeleteOldImage( $s->oi_archive_name );
                $urlArr[] = $wgInternalServer.wfImageArchiveUrl( $s->oi_archive_name );
            }

            # Squid purging, part II
            if ( $wgUseSquid ) {
                /* this needs to be done after LinksUpdate */
                $u = new SquidUpdate( $urlArr );
                array_push( $wgDeferredUpdateList, $u );
            }

            $dbw->delete( 'oldimage', array( 'oi_name' => $image ) );

            # Image itself is now gone, and database is cleaned.
            # Now we remove the image description page.

            $nt = Title::newFromText( $wgContLang->getNsText( Namespace::getImage() ) . ":" . $image );
            $article = new Article( $nt );
            $article->doDeleteArticle( $reason ); # ignore errors

            /* refresh image metadata cache */
            new Image( $image, true );

            $deleted = $image;
        }

        $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
        $wgOut->setRobotpolicy( 'noindex,nofollow' );

        $sk = $wgUser->getSkin();
        $loglink = $sk->makeKnownLink( $wgContLang->getNsText( NS_SPECIAL ) .
          ':Log/delete', wfMsg( 'deletionlog' ) );

        $text = wfMsg( 'deletedtext', $deleted, $loglink );

        $wgOut->addHTML( '<p>' . $text . "</p>\n" );
        $wgOut->returnToMain( false );
    }

    function doDeleteOldImage( $oldimage )
    {
        global $wgOut;

        $name = substr( $oldimage, 15 );
        $archive = wfImageArchiveDir( $name );

        # Delete the image if it exists. Sometimes the file will be missing
        # due to manual intervention or weird sync problems; treat that
        # condition gracefully and continue to delete the database entry.
        # Also some records may end up with an empty oi_archive_name field
        # if the original file was missing when a new upload was made;
        # don't try to delete the directory then!
        #
        $targetFile = "{$archive}/{$oldimage}";
        if( $oldimage != '' && file_exists( $targetFile ) && !@unlink( $targetFile ) ) {
            # If we actually have a file and can't delete it, throw an error.
            $wgOut->fileDeleteError( "{$archive}/{$oldimage}" );
        } else {
            # Log the deletion
            $log = new LogPage( 'delete' );
            $log->addEntry( 'delete', $this->mTitle, wfMsg('deletedrevision',$oldimage) );
        }
    }

    function revert()
    {
        global $wgOut, $wgRequest, $wgUser;
        global $wgUseSquid, $wgInternalServer, $wgDeferredUpdateList;

        $oldimage = $wgRequest->getText( 'oldimage' );
        if ( strlen( $oldimage ) < 16 ) {
            $wgOut->unexpectedValueError( 'oldimage', htmlspecialchars($oldimage) );
            return;
        }
        if ( strstr( $oldimage, "/" ) || strstr( $oldimage, "\\" ) ) {
            $wgOut->unexpectedValueError( 'oldimage', htmlspecialchars($oldimage) );
            return;
        }

        if ( wfReadOnly() ) {
            $wgOut->readOnlyPage();
            return;
        }
        if( $wgUser->getId() == 0 ) {
            $wgOut->errorpage( 'uploadnologin', 'uploadnologintext' );
            return;
        }
        if ( ! $this->mTitle->userCanEdit() ) {
            $wgOut->sysopRequired();
            return;
        }
        if ( $wgUser->isBlocked() ) {
            return $this->blockedIPpage();
        }
        if( !$wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ), $oldimage ) ) {
            $wgOut->errorpage( 'internalerror', 'sessionfailure' );
            return;
        }
        $name = substr( $oldimage, 15 );

        $dest = wfImageDir( $name );
        $archive = wfImageArchiveDir( $name );
        $curfile = "{$dest}/{$name}";

        if ( ! is_file( $curfile ) ) {
            $wgOut->fileNotFoundError( htmlspecialchars( $curfile ) );
            return;
        }
        $oldver = wfTimestampNow() . "!{$name}";

        $dbr =& wfGetDB( DB_SLAVE );
        $size = $dbr->selectField( 'oldimage', 'oi_size', 'oi_archive_name=\'' .
          $dbr->strencode( $oldimage ) . "'" );

        if ( ! rename( $curfile, "${archive}/{$oldver}" ) ) {
            $wgOut->fileRenameError( $curfile, "${archive}/{$oldver}" );
            return;
        }
        if ( ! copy( "{$archive}/{$oldimage}", $curfile ) ) {
            $wgOut->fileCopyError( "${archive}/{$oldimage}", $curfile );
        }
        wfRecordUpload( $name, $oldver, $size, wfMsg( "reverted" ) );

        /* refresh image metadata cache */
        new Image( $name, true );

        # Squid purging
        if ( $wgUseSquid ) {
            $archUrl = wfImageArchiveUrl( $name );
            $curUrl = Image::wfImageUrl( $name );
            $prefix = preg_match("/^http:\/\//",$curUrl) ? '' : $wgInternalServer;
            $urlArr = Array(
                    $prefix.$archUrl,
                    $prefix.$curUrl
            );
            wfPurgeSquidServers($urlArr);
        }

        $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
        $wgOut->setRobotpolicy( 'noindex,nofollow' );
        $wgOut->addHTML( wfMsg( 'imagereverted' ) );
        $wgOut->returnToMain( false );
    }

    function blockedIPpage() {
        # yucky hack
        require_once( 'EditPage.php' );
        $edit = new EditPage( $this->mTitle );
        $edit->blockedIPpage();
        return;
    }
}

class ImageHistoryList {
    function ImageHistoryList( &$skin ) {
        $this->skin =& $skin;
    }

    function beginImageHistoryList() {
        $s = "\n<h2>" . wfMsg( 'imghistory' ) . "</h2>\n" .
          "<p>" . wfMsg( 'imghistlegend' ) . "</p>\n".'<ul class="special">';
        return $s;
    }

    function endImageHistoryList() {
        $s = "</ul>\n";
        return $s;
    }

    function imageHistoryLine( $iscur, $timestamp, $img, $user, $usertext, $size, $description ) {
        global $wgUser, $wgLang, $wgContLang, $wgTitle;

        $datetime = $wgLang->timeanddate( $timestamp, true );
        $del = wfMsg( 'deleteimg' );
        $delall = wfMsg( 'deleteimgcompletely' );
        $cur = wfMsg( 'cur' );

        if ( $iscur ) {
            $url = Image::wfImageUrl( $img );
            $rlink = $cur;
            if ( $wgUser->isAllowed('delete') ) {
                $link = $wgTitle->escapeLocalURL( 'image=' . $wgTitle->getPartialURL() .
                  '&action=delete' );
                $style = $this->skin->getInternalLinkAttributes( $link, $delall );

                $dlink = '<a href="'.$link.'"'.$style.'>'.$delall.'</a>';
            } else {
                $dlink = $del;
            }
        } else {
            $url = htmlspecialchars( wfImageArchiveUrl( $img ) );
            if( $wgUser->getID() != 0 && $wgTitle->userCanEdit() ) {
                $token = urlencode( $wgUser->editToken( $img ) );
                $rlink = $this->skin->makeKnownLink( $wgTitle->getPrefixedText(),
                           wfMsg( 'revertimg' ), 'action=revert&oldimage=' .
                           urlencode( $img ) . "&wpEditToken=$token" );
                $dlink = $this->skin->makeKnownLink( $wgTitle->getPrefixedText(),
                           $del, 'action=delete&oldimage=' . urlencode( $img ) .
                           "&wpEditToken=$token" );
            } else {
                # Having live active links for non-logged in users
                # means that bots and spiders crawling our site can
                # inadvertently change content. Baaaad idea.
                $rlink = wfMsg( 'revertimg' );
                $dlink = $del;
            }
        }
        if ( 0 == $user ) {
            $userlink = $usertext;
        } else {
            $userlink = $this->skin->makeLink( $wgContLang->getNsText( Namespace::getUser() ) .
                           ':'.$usertext, $usertext );
        }
        $nbytes = wfMsg( 'nbytes', $size );
        $style = $this->skin->getInternalLinkAttributes( $url, $datetime );

        $s = "<li> ({$dlink}) ({$rlink}) <a href=\"{$url}\"{$style}>{$datetime}</a>"
          . " . . {$userlink} ({$nbytes})";

        if ( '' != $description && '*' != $description ) {
            $sk=$wgUser->getSkin();
            $s .= $wgContLang->emphasize(' (' . $sk->formatComment($description,$wgTitle) . ')');
        }
        $s .= "</li>\n";
        return $s;
    }
}


?>