includes/FileDeleteForm.php

   1 <?php
   2
   3 /**
   4  * File deletion user interface
   5  *
   6  * @addtogroup Media
   7  * @author Rob Church <robchur@gmail.com>
   8  */
   9 class FileDeleteForm {
  10
  11         private $title = null;
  12         private $file = null;
  13
  14         private $oldfile = null;
  15         private $oldimage = '';
  16
  17         /**
  18          * Constructor
  19          *
  20          * @param File $file File we're deleting
  21          */
  22         public function __construct( $file ) {
  23                 $this->title = $file->getTitle();
  24                 $this->file = $file;
  25         }
  26
  27         /**
  28          * Fulfil the request; shows the form or deletes the file,
  29          * pending authentication, confirmation, etc.
  30          */
  31         public function execute() {
  32                 global $wgOut, $wgRequest, $wgUser;
  33                 $this->setHeaders();
  34
  35                 if( wfReadOnly() ) {
  36                         $wgOut->readOnlyPage();
  37                         return;
  38                 } elseif( !$wgUser->isLoggedIn() ) {
  39                         $wgOut->showErrorPage( 'uploadnologin', 'uploadnologintext' );
  40                         return;
  41                 } elseif( !$wgUser->isAllowed( 'delete' ) ) {
  42                         $wgOut->permissionError( 'delete' );
  43                         return;
  44                 } elseif( $wgUser->isBlocked() ) {
  45                         $wgOut->blockedPage();
  46                         return;
  47                 }
  48
  49                 $this->oldimage = $wgRequest->getText( 'oldimage', false );
  50                 $token = $wgRequest->getText( 'wpEditToken' );
  51                 if( $this->oldimage && !$this->isValidOldSpec() ) {
  52                         $wgOut->showUnexpectedValueError( 'oldimage', htmlspecialchars( $this->oldimage ) );
  53                         return;
  54                 }
  55                 if( $this->oldimage )
  56                         $this->oldfile = RepoGroup::singleton()->getLocalRepo()->newFromArchiveName( $this->title, $this->oldimage );
  57
  58                 if( !$this->haveDeletableFile() ) {
  59                         $wgOut->addHtml( $this->prepareMessage( 'filedelete-nofile' ) );
  60                         $wgOut->addReturnTo( $this->title );
  61                         return;
  62                 }
  63
  64                 // Perform the deletion if appropriate
  65                 if( $wgRequest->wasPosted() && $wgUser->matchEditToken( $token, $this->oldimage ) ) {
  66                         $comment = $wgRequest->getText( 'wpReason' );
  67                         if( $this->oldimage ) {
  68                                 $status = $this->file->deleteOld( $this->oldimage, $comment );
  69                                 if( $status->ok ) {
  70                                         // Need to do a log item
  71                                         $log = new LogPage( 'delete' );
  72                                         $logComment = wfMsg( 'deletedrevision', $this->oldimage );
  73                                         if( trim( $comment ) != '' )
  74                                                 $logComment .= ": {$comment}";
  75                                         $log->addEntry( 'delete', $this->title, $logComment );
  76                                 }
  77                         } else {
  78                                 $status = $this->file->delete( $comment );
  79                                 if( $status->ok ) {
  80                                         // Need to delete the associated article
  81                                         $article = new Article( $this->title );
  82                                         $article->doDeleteArticle( $comment );
  83                                 }
  84                         }
  85                         if( !$status->isGood() )
  86                                 $wgOut->addWikiText( $status->getWikiText( 'filedeleteerror-short', 'filedeleteerror-long' ) );
  87                         if( $status->ok ) {
  88                                 $wgOut->addHtml( $this->prepareMessage( 'filedelete-success' ) );
  89                                 // Return to the main page if we just deleted all versions of the
  90                                 // file, otherwise go back to the description page
  91                                 $wgOut->addReturnTo( $this->oldimage ? $this->title : Title::newMainPage() );
  92                         }
  93                         return;
  94                 }
  95
  96                 $this->showForm();
  97                 $this->showLogEntries();
  98         }
  99
 100         /**
 101          * Show the confirmation form
 102          */
 103         private function showForm() {
 104                 global $wgOut, $wgUser, $wgRequest;
 105
 106                 $form  = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $this->getAction() ) );
 107                 $form .= Xml::hidden( 'wpEditToken', $wgUser->editToken( $this->oldimage ) );
 108                 $form .= '<fieldset><legend>' . wfMsgHtml( 'filedelete-legend' ) . '</legend>';
 109                 $form .= $this->prepareMessage( 'filedelete-intro' );
 110
 111                 $form .= '<p>' . Xml::inputLabel( wfMsg( 'filedelete-comment' ), 'wpReason', 'wpReason',
 112                         60, $wgRequest->getText( 'wpReason' ) ) . '</p>';
 113                 $form .= '<p>' . Xml::submitButton( wfMsg( 'filedelete-submit' ), array( 'name' => 'mw-filedelete-submit', 'id' => 'mw-filedelete-submit' ) ) . '</p>';
 114                 $form .= '</fieldset>';
 115                 $form .= '</form>';
 116
 117                 $wgOut->addHtml( $form );
 118         }
 119
 120         /**
 121          * Show deletion log fragments pertaining to the current file
 122          */
 123         private function showLogEntries() {
 124                 global $wgOut;
 125                 $wgOut->addHtml( '<h2>' . htmlspecialchars( LogPage::logName( 'delete' ) ) . "</h2>\n" );
 126                 $reader = new LogViewer(
 127                         new LogReader(
 128                                 new FauxRequest(
 129                                         array(
 130                                                 'type' => 'delete',
 131                                                 'page' => $this->title->getPrefixedText(),
 132                                         )
 133                                 )
 134                         )
 135                 );
 136                 $reader->showList( $wgOut );
 137         }
 138
 139         /**
 140          * Prepare a message referring to the file being deleted,
 141          * showing an appropriate message depending upon whether
 142          * it's a current file or an old version
 143          *
 144          * @param string $message Message base
 145          * @return string
 146          */
 147         private function prepareMessage( $message ) {
 148                 global $wgLang, $wgServer;
 149                 if( $this->oldimage ) {
 150                         return wfMsgExt(
 151                                 "{$message}-old",
 152                                 'parse',
 153                                 $this->title->getText(),
 154                                 $wgLang->date( $this->getTimestamp(), true ),
 155                                 $wgLang->time( $this->getTimestamp(), true ),
 156                                 $wgServer . $this->file->getArchiveUrl( $this->oldimage )
 157                         );
 158                 } else {
 159                         return wfMsgExt(
 160                                 $message,
 161                                 'parse',
 162                                 $this->title->getText()
 163                         );
 164                 }
 165         }
 166
 167         /**
 168          * Set headers, titles and other bits
 169          */
 170         private function setHeaders() {
 171                 global $wgOut, $wgUser;
 172                 $wgOut->setPageTitle( wfMsg( 'filedelete', $this->title->getText() ) );
 173                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 174                 $wgOut->setSubtitle( wfMsg( 'filedelete-backlink', $wgUser->getSkin()->makeKnownLinkObj( $this->title ) ) );
 175         }
 176
 177         /**
 178          * Is the provided `oldimage` value valid?
 179          *
 180          * @return bool
 181          */
 182         private function isValidOldSpec() {
 183                 return strlen( $this->oldimage ) >= 16
 184                         && strpos( $this->oldimage, '/' ) === false
 185                         && strpos( $this->oldimage, '\\' ) === false;
 186         }
 187
 188         /**
 189          * Could we delete the file specified? If an `oldimage`
 190          * value was provided, does it correspond to an
 191          * existing, local, old version of this file?
 192          *
 193          * @return bool
 194          */
 195         private function haveDeletableFile() {
 196                 return $this->oldimage
 197                         ? $this->oldfile && $this->oldfile->exists() && $this->oldfile->isLocal()
 198                         : $this->file && $this->file->exists() && $this->file->isLocal();
 199         }
 200
 201         /**
 202          * Prepare the form action
 203          *
 204          * @return string
 205          */
 206         private function getAction() {
 207                 $q = array();
 208                 $q[] = 'action=delete';
 209                 if( $this->oldimage )
 210                         $q[] = 'oldimage=' . urlencode( $this->oldimage );
 211                 return $this->title->getLocalUrl( implode( '&', $q ) );
 212         }
 213
 214         /**
 215          * Extract the timestamp of the old version
 216          *
 217          * @return string
 218          */
 219         private function getTimestamp() {
 220                 return $this->oldfile->getTimestamp();
 221         }
 222
 223 }