<?php

/*
	Special handling for image description pages
*/

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, $wgUser,$wgRequest;
		$this->img  = Image::newFromTitle( $this->mTitle );
		$url  = $this->img->getUrl();

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

			$sk = $wgUser->getSkin();
			
			if ( $this->img->getType() != "" ) {
				# image
				$s = "<div class=\"fullImage\">" .
				     "<img src=\"{$url}\" width=\"" . $this->img->getWidth() . "\" height=\"" . $this->img->getHeight() .
				     "\" alt=\"". htmlspecialchars( $wgRequest->getVal( 'image' ) )."\" /></div>";
			} 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 ) {
			$s = $sk->beginImageHistoryList() .
				$sk->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 .= $sk->imageHistoryLine( false, $line->img_timestamp,
					$line->oi_archive_name, $line->img_user,
					$line->img_user_text, $line->img_size, $line->img_description );
			}
			$s .= $sk->endImageHistoryList();
		} else { $s=""; }

		$wgOut->addHTML( $s );
	}

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

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

		$sql = "SELECT cur_namespace,cur_title FROM imagelinks,cur WHERE il_to='" .
		  wfStrencode( $this->mTitle->getDBkey() ) . "' AND il_from=cur_id";
		$res = wfQuery( $sql, DB_READ, "Article::imageLinks" );

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

		$sk = $wgUser->getSkin();
		while ( $s = wfFetchObject( $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->isSysop() ) {
			$wgOut->sysopRequired();
			return;
		}
		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, $wgLang, $wgRequest;
		global $wgUseSquid, $wgInternalServer, $wgDeferredUpdateList;
		$fname = "Article::doDelete";

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

		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 ) {
				$urlArr = Array(
					$wgInternalServer.wfImageArchiveUrl( $oldimage )
				);
				wfPurgeSquidServers($urlArr);
			}
			$this->doDeleteOldImage( $oldimage );
			$sql = "DELETE FROM oldimage WHERE oi_archive_name='" .
			  wfStrencode( $oldimage ) . "'";
			wfQuery( $sql, DB_WRITE, $fname );

			$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;
			}
			$sql = "DELETE FROM image WHERE img_name='" .
			  wfStrencode( $image ) . "'";
			wfQuery( $sql, DB_WRITE, $fname );

			$sql = "SELECT oi_archive_name FROM oldimage WHERE oi_name='" .
			  wfStrencode( $image ) . "'";
			$res = wfQuery( $sql, DB_READ, $fname );
			
			# Squid purging
			if ( $wgUseSquid ) {
				$urlArr = Array(
					$wgInternalServer . Image::wfImageUrl( $image )
				);
				wfPurgeSquidServers($urlArr);
			}
			

			$urlArr = Array();
			while ( $s = wfFetchObject( $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 );
			}
			
			$sql = "DELETE FROM oldimage WHERE oi_name='" .
			  wfStrencode( $image ) . "'";
			wfQuery( $sql, DB_WRITE, $fname );

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

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

			$deleted = $image;
		} 
		$wgOut->setPagetitle( wfMsg( "actioncomplete" ) );
		$wgOut->setRobotpolicy( "noindex,nofollow" );

		$sk = $wgUser->getSkin();
		$loglink = $sk->makeKnownLink( $wgLang->getNsText(
		  Namespace::getWikipedia() ) .
		  ":" . wfMsg( "dellogpage" ), 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}" );
		}
	}

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

		if ( $wgUser->isBlocked() ) {
			$wgOut->blockedIPpage();
			return;
		}

		$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 ( ! $this->mTitle->userCanEdit() ) {
			$wgOut->sysopRequired();
			return;
		}
		if( !$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}";
		$size = wfGetSQL( "oldimage", "oi_size", "oi_archive_name='" .
		  wfStrencode( $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" ) );
		# Squid purging
		if ( $wgUseSquid ) {
			$urlArr = Array(
				$wgInternalServer.wfImageArchiveUrl( $name ),
				$wgInternalServer . Image::wfImageUrl( $name )
			);
			wfPurgeSquidServers($urlArr);
		}

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

?>
