includes/actions/WatchAction.php

   1 <?php
   2 /**
   3  * Performs the watch and unwatch actions on a page
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
  18  *
  19  * @file
  20  * @ingroup Actions
  21  */
  22
  23 class WatchAction extends FormAction {
  24
  25         public function getName() {
  26                 return 'watch';
  27         }
  28
  29         public function getRestriction() {
  30                 return 'read';
  31         }
  32
  33         public function requiresUnblock() {
  34                 return false;
  35         }
  36
  37         protected function getDescription() {
  38                 return wfMsg( 'addwatch' );
  39         }
  40
  41         /**
  42          * Just get an empty form with a single submit button
  43          * @return array
  44          */
  45         protected function getFormFields() {
  46                 return array();
  47         }
  48
  49         public function onSubmit( $data ) {
  50                 wfProfileIn( __METHOD__ );
  51                 self::doWatch( $this->getTitle(), $this->getUser() );
  52                 wfProfileOut( __METHOD__ );
  53                 return true;
  54         }
  55
  56         /**
  57          * This can be either formed or formless depending on the session token given
  58          */
  59         public function show() {
  60                 $this->setHeaders();
  61
  62                 $user = $this->getUser();
  63                 // This will throw exceptions if there's a problem
  64                 $this->checkCanExecute( $user );
  65
  66                 // Must have valid token for this action/title
  67                 $salt = array( $this->getName(), $this->getTitle()->getDBkey() );
  68
  69                 if ( $user->matchEditToken( $this->getRequest()->getVal( 'token' ), $salt ) ) {
  70                         $this->onSubmit( array() );
  71                         $this->onSuccess();
  72                 } else {
  73                         $form = $this->getForm();
  74                         if ( $form->show() ) {
  75                                 $this->onSuccess();
  76                         }
  77                 }
  78         }
  79
  80         protected function checkCanExecute( User $user ) {
  81                 // Must be logged in
  82                 if ( $user->isAnon() ) {
  83                         throw new ErrorPageError( 'watchnologin', 'watchnologintext' );
  84                 }
  85
  86                 return parent::checkCanExecute( $user );
  87         }
  88
  89         public static function doWatch( Title $title, User $user  ) {
  90                 $page = new Article( $title, 0 );
  91
  92                 if ( wfRunHooks( 'WatchArticle', array( &$user, &$page ) ) ) {
  93                         $user->addWatch( $title );
  94                         wfRunHooks( 'WatchArticleComplete', array( &$user, &$page ) );
  95                 }
  96                 return true;
  97         }
  98
  99         public static function doUnwatch( Title $title, User $user  ) {
 100                 $page = new Article( $title, 0 );
 101
 102                 if ( wfRunHooks( 'UnwatchArticle', array( &$user, &$page ) ) ) {
 103                         $user->removeWatch( $title );
 104                         wfRunHooks( 'UnwatchArticleComplete', array( &$user, &$page ) );
 105                 }
 106                 return true;
 107         }
 108
 109         /**
 110          * Get token to watch (or unwatch) a page for a user
 111          *
 112          * @param Title $title Title object of page to watch
 113          * @param User $title User for whom the action is going to be performed
 114          * @param string $action Optionally override the action to 'unwatch'
 115          * @return string Token
 116          * @since 1.18
 117          */
 118         public static function getWatchToken( Title $title, User $user, $action = 'watch' ) {
 119                 if ( $action != 'unwatch' ) {
 120                         $action = 'watch';
 121                 }
 122                 $salt = array( $action, $title->getDBkey() );
 123
 124                 // This token stronger salted and not compatible with ApiWatch
 125                 // It's title/action specific because index.php is GET and API is POST
 126                 return $user->editToken( $salt );
 127         }
 128
 129         /**
 130          * Get token to unwatch (or watch) a page for a user
 131          *
 132          * @param Title $title Title object of page to unwatch
 133          * @param User $title User for whom the action is going to be performed
 134          * @param string $action Optionally override the action to 'watch'
 135          * @return string Token
 136          * @since 1.18
 137          */
 138         public static function getUnwatchToken( Title $title, User $user, $action = 'unwatch' ) {
 139                 return self::getWatchToken( $title, $user, $action );
 140         }
 141
 142         protected function alterForm( HTMLForm $form ) {
 143                 $form->setSubmitText( wfMsg( 'confirm-watch-button' ) );
 144         }
 145
 146         protected function preText() {
 147                 return wfMessage( 'confirm-watch-top' )->parse();
 148         }
 149
 150         public function onSuccess() {
 151                 $this->getOutput()->addWikiMsg( 'addedwatchtext', $this->getTitle()->getPrefixedText() );
 152         }
 153 }
 154
 155 class UnwatchAction extends WatchAction {
 156
 157         public function getName() {
 158                 return 'unwatch';
 159         }
 160
 161         protected function getDescription() {
 162                 return wfMsg( 'removewatch' );
 163         }
 164
 165         public function onSubmit( $data ) {
 166                 wfProfileIn( __METHOD__ );
 167                 self::doUnwatch( $this->getTitle(), $this->getUser() );
 168                 wfProfileOut( __METHOD__ );
 169                 return true;
 170         }
 171
 172         protected function alterForm( HTMLForm $form ) {
 173                 $form->setSubmitText( wfMsg( 'confirm-unwatch-button' ) );
 174         }
 175
 176         protected function preText() {
 177                 return wfMessage( 'confirm-unwatch-top' )->parse();
 178         }
 179
 180         public function onSuccess() {
 181                 $this->getOutput()->addWikiMsg( 'removedwatchtext', $this->getTitle()->getPrefixedText() );
 182         }
 183 }