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<?php
/**
* File reversion user interface
*
* @addtogroup Media
* @author Rob Church <robchur@gmail.com>
*/
class FileRevertForm {
private $title = null;
private $file = null;
private $oldimage = '';
private $timestamp = false;
/**
* Constructor
*
* @param File $file File we're reverting
*/
public function __construct( $file ) {
$this->title = $file->getTitle();
$this->file = $file;
}
/**
* Fulfil the request; shows the form or reverts the file,
* pending authentication, confirmation, etc.
*/
public function execute() {
global $wgOut, $wgRequest, $wgUser, $wgLang;
$this->setHeaders();
if( wfReadOnly() ) {
$wgOut->readOnlyPage();
return;
} elseif( !$wgUser->isLoggedIn() ) {
$wgOut->showErrorPage( 'uploadnologin', 'uploadnologintext' );
return;
} elseif( !$this->title->userCan( 'edit' ) ) {
// The standard read-only thing doesn't make a whole lot of sense
// here; surely it should show the image or something? -- RC
$article = new Article( $this->title );
$wgOut->readOnlyPage( $article->getContent(), true );
return;
} elseif( $wgUser->isBlocked() ) {
$wgOut->blockedPage();
return;
}
$this->oldimage = $wgRequest->getText( 'oldimage' );
$token = $wgRequest->getText( 'wpEditToken' );
if( !$this->isValidOldSpec() ) {
$wgOut->showUnexpectedValueError( 'oldimage', htmlspecialchars( $this->oldimage ) );
return;
}
if( !$this->haveOldVersion() ) {
$wgOut->addHtml( wfMsgExt( 'filerevert-badversion', 'parse' ) );
$wgOut->returnToMain( false, $this->title );
return;
}
// Perform the reversion if appropriate
if( $wgRequest->wasPosted() && $wgUser->matchEditToken( $token, $this->oldimage ) ) {
$source = $this->file->getArchiveVirtualUrl( $this->oldimage );
$comment = $wgRequest->getText( 'wpComment' );
// TODO: Preserve file properties from database instead of reloading from file
$status = $this->file->upload( $source, $comment, $comment );
if( $status->isGood() ) {
$wgOut->addHtml( wfMsgExt( 'filerevert-success', 'parse', $this->title->getText(),
$wgLang->date( $this->getTimestamp(), true ),
$wgLang->time( $this->getTimestamp(), true ),
wfExpandUrl( $this->file->getArchiveUrl( $this->oldimage ) ) ) );
$wgOut->returnToMain( false, $this->title );
} else {
$wgOut->addWikiText( $status->getWikiText() );
}
return;
}
// Show the form
$this->showForm();
}
/**
* Show the confirmation form
*/
private function showForm() {
global $wgOut, $wgUser, $wgRequest, $wgLang, $wgContLang;
$timestamp = $this->getTimestamp();
$form = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $this->getAction() ) );
$form .= Xml::hidden( 'wpEditToken', $wgUser->editToken( $this->oldimage ) );
$form .= '<fieldset><legend>' . wfMsgHtml( 'filerevert-legend' ) . '</legend>';
$form .= wfMsgExt( 'filerevert-intro', 'parse', $this->title->getText(),
$wgLang->date( $timestamp, true ), $wgLang->time( $timestamp, true ),
wfExpandUrl( $this->file->getArchiveUrl( $this->oldimage ) ) );
$form .= '<p>' . Xml::inputLabel( wfMsg( 'filerevert-comment' ), 'wpComment', 'wpComment',
60, wfMsgForContent( 'filerevert-defaultcomment',
$wgContLang->date( $timestamp, false, false ), $wgContLang->time( $timestamp, false, false ) ) ) . '</p>';
$form .= '<p>' . Xml::submitButton( wfMsg( 'filerevert-submit' ) ) . '</p>';
$form .= '</fieldset>';
$form .= '</form>';
$wgOut->addHtml( $form );
}
/**
* Set headers, titles and other bits
*/
private function setHeaders() {
global $wgOut, $wgUser;
$wgOut->setPageTitle( wfMsg( 'filerevert', $this->title->getText() ) );
$wgOut->setRobotPolicy( 'noindex,nofollow' );
$wgOut->setSubtitle( wfMsg( 'filerevert-backlink', $wgUser->getSkin()->makeKnownLinkObj( $this->title ) ) );
}
/**
* Is the provided `oldimage` value valid?
*
* @return bool
*/
private function isValidOldSpec() {
return strlen( $this->oldimage ) >= 16
&& strpos( $this->oldimage, '/' ) === false
&& strpos( $this->oldimage, '\\' ) === false;
}
/**
* Does the provided `oldimage` value correspond
* to an existing, local, old version of this file?
*
* @return bool
*/
private function haveOldVersion() {
$file = wfFindFile( $this->title, $this->oldimage );
return $file && $file->exists() && $file->isLocal();
}
/**
* Prepare the form action
*
* @return string
*/
private function getAction() {
$q = array();
$q[] = 'action=revert';
$q[] = 'oldimage=' . urlencode( $this->oldimage );
return $this->title->getLocalUrl( implode( '&', $q ) );
}
/**
* Extract the timestamp of the old version
*
* @return string
*/
private function getTimestamp() {
if( $this->timestamp === false ) {
$file = RepoGroup::singleton()->getLocalRepo()->newFromArchiveName( $this->title, $this->oldimage );
$this->timestamp = $file->getTimestamp();
}
return $this->timestamp;
}
}
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