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[mediawiki.git] / includes / actions / WatchAction.php

<?php
/**
 * Performs the watch actions on a page
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 *
 * @file
 * @ingroup Actions
 */

/**
 * Page addition to a user's watchlist
 *
 * @ingroup Actions
 */
class WatchAction extends FormAction {

        public function getName() {
                return 'watch';
        }

        public function requiresUnblock() {
                return false;
        }

        protected function getDescription() {
                return $this->msg( 'addwatch' )->escaped();
        }

        /**
         * Just get an empty form with a single submit button
         * @return array
         */
        protected function getFormFields() {
                return array();
        }

        public function onSubmit( $data ) {
                self::doWatch( $this->getTitle(), $this->getUser() );

                return true;
        }

        /**
         * This can be either formed or formless depending on the session token given
         */
        public function show() {
                $this->setHeaders();

                $user = $this->getUser();
                // This will throw exceptions if there's a problem
                $this->checkCanExecute( $user );

                // Must have valid token for this action/title
                $salt = array( $this->getName(), $this->getTitle()->getDBkey() );

                if ( $user->matchEditToken( $this->getRequest()->getVal( 'token' ), $salt ) ) {
                        $this->onSubmit( array() );
                        $this->onSuccess();
                } else {
                        $form = $this->getForm();
                        if ( $form->show() ) {
                                $this->onSuccess();
                        }
                }
        }

        protected function checkCanExecute( User $user ) {
                // Must be logged in
                if ( $user->isAnon() ) {
                        throw new UserNotLoggedIn( 'watchlistanontext', 'watchnologin' );
                }

                parent::checkCanExecute( $user );
        }

        /**
         * Watch or unwatch a page
         * @since 1.22
         * @param bool $watch Whether to watch or unwatch the page
         * @param Title $title Page to watch/unwatch
         * @param User $user User who is watching/unwatching
         * @return Status
         */
        public static function doWatchOrUnwatch( $watch, Title $title, User $user ) {
                if ( $user->isLoggedIn() &&
                        $user->isWatched( $title, WatchedItem::IGNORE_USER_RIGHTS ) != $watch
                ) {
                        // If the user doesn't have 'editmywatchlist', we still want to
                        // allow them to add but not remove items via edits and such.
                        if ( $watch ) {
                                return self::doWatch( $title, $user, WatchedItem::IGNORE_USER_RIGHTS );
                        } else {
                                return self::doUnwatch( $title, $user );
                        }
                }

                return Status::newGood();
        }

        /**
         * Watch a page
         * @since 1.22 Returns Status, $checkRights parameter added
         * @param Title $title Page to watch/unwatch
         * @param User $user User who is watching/unwatching
         * @param int $checkRights Passed through to $user->addWatch()
         * @return Status
         */
        public static function doWatch( Title $title, User $user,
                $checkRights = WatchedItem::CHECK_USER_RIGHTS
        ) {
                if ( $checkRights !== WatchedItem::IGNORE_USER_RIGHTS &&
                        !$user->isAllowed( 'editmywatchlist' )
                ) {
                        return User::newFatalPermissionDeniedStatus( 'editmywatchlist' );
                }

                $page = WikiPage::factory( $title );

                $status = Status::newFatal( 'hookaborted' );
                if ( Hooks::run( 'WatchArticle', array( &$user, &$page, &$status ) ) ) {
                        $status = Status::newGood();
                        $user->addWatch( $title, $checkRights );
                        Hooks::run( 'WatchArticleComplete', array( &$user, &$page ) );
                }

                return $status;
        }

        /**
         * Unwatch a page
         * @since 1.22 Returns Status
         * @param Title $title Page to watch/unwatch
         * @param User $user User who is watching/unwatching
         * @return Status
         */
        public static function doUnwatch( Title $title, User $user ) {
                if ( !$user->isAllowed( 'editmywatchlist' ) ) {
                        return User::newFatalPermissionDeniedStatus( 'editmywatchlist' );
                }

                $page = WikiPage::factory( $title );

                $status = Status::newFatal( 'hookaborted' );
                if ( Hooks::run( 'UnwatchArticle', array( &$user, &$page, &$status ) ) ) {
                        $status = Status::newGood();
                        $user->removeWatch( $title );
                        Hooks::run( 'UnwatchArticleComplete', array( &$user, &$page ) );
                }

                return $status;
        }

        /**
         * Get token to watch (or unwatch) a page for a user
         *
         * @param Title $title Title object of page to watch
         * @param User $user User for whom the action is going to be performed
         * @param string $action Optionally override the action to 'unwatch'
         * @return string Token
         * @since 1.18
         */
        public static function getWatchToken( Title $title, User $user, $action = 'watch' ) {
                if ( $action != 'unwatch' ) {
                        $action = 'watch';
                }
                $salt = array( $action, $title->getPrefixedDBkey() );

                // This token stronger salted and not compatible with ApiWatch
                // It's title/action specific because index.php is GET and API is POST
                return $user->getEditToken( $salt );
        }

        /**
         * Get token to unwatch (or watch) a page for a user
         *
         * @param Title $title Title object of page to unwatch
         * @param User $user User for whom the action is going to be performed
         * @param string $action Optionally override the action to 'watch'
         * @return string Token
         * @since 1.18
         */
        public static function getUnwatchToken( Title $title, User $user, $action = 'unwatch' ) {
                return self::getWatchToken( $title, $user, $action );
        }

        protected function alterForm( HTMLForm $form ) {
                $form->setSubmitTextMsg( 'confirm-watch-button' );
        }

        protected function preText() {
                return $this->msg( 'confirm-watch-top' )->parse();
        }

        public function onSuccess() {
                $this->getOutput()->addWikiMsg( 'addedwatchtext', $this->getTitle()->getPrefixedText() );
        }
}