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[mediawiki.git] / includes / mail / EmailNotification.php

<?php
/**
 * Classes used to send e-mails
 *
 * 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.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @author <brion@pobox.com>
 * @author <mail@tgries.de>
 * @author Tim Starling
 * @author Luke Welling lwelling@wikimedia.org
 */
use MediaWiki\Linker\LinkTarget;

use MediaWiki\MediaWikiServices;

/**
 * This module processes the email notifications when the current page is
 * changed. It looks up the table watchlist to find out which users are watching
 * that page.
 *
 * The current implementation sends independent emails to each watching user for
 * the following reason:
 *
 * - Each watching user will be notified about the page edit time expressed in
 * his/her local time (UTC is shown additionally). To achieve this, we need to
 * find the individual timeoffset of each watching user from the preferences..
 *
 * Suggested improvement to slack down the number of sent emails: We could think
 * of sending out bulk mails (bcc:user1,user2...) for all these users having the
 * same timeoffset in their preferences.
 *
 * Visit the documentation pages under http://meta.wikipedia.com/Enotif
 */
class EmailNotification {

        /**
         * Notification is due to user's user talk being edited
         */
        const USER_TALK = 'user_talk';
        /**
         * Notification is due to a watchlisted page being edited
         */
        const WATCHLIST = 'watchlist';
        /**
         * Notification because user is notified for all changes
         */
        const ALL_CHANGES = 'all_changes';

        protected $subject, $body, $replyto, $from;
        protected $timestamp, $summary, $minorEdit, $oldid, $composed_common, $pageStatus;
        protected $mailTargets = [];

        /**
         * @var Title
         */
        protected $title;

        /**
         * @var User
         */
        protected $editor;

        /**
         * @deprecated since 1.27 use WatchedItemStore::updateNotificationTimestamp directly
         *
         * @param User $editor The editor that triggered the update.  Their notification
         *  timestamp will not be updated(they have already seen it)
         * @param LinkTarget $linkTarget The link target of the title to update timestamps for
         * @param string $timestamp Set the update timestamp to this value
         *
         * @return int[] Array of user IDs
         */
        public static function updateWatchlistTimestamp(
                User $editor,
                LinkTarget $linkTarget,
                $timestamp
        ) {
                // wfDeprecated( __METHOD__, '1.27' );
                $config = RequestContext::getMain()->getConfig();
                if ( !$config->get( 'EnotifWatchlist' ) && !$config->get( 'ShowUpdatedMarker' ) ) {
                        return [];
                }
                return MediaWikiServices::getInstance()->getWatchedItemStore()->updateNotificationTimestamp(
                        $editor,
                        $linkTarget,
                        $timestamp
                );
        }

        /**
         * Send emails corresponding to the user $editor editing the page $title.
         *
         * May be deferred via the job queue.
         *
         * @param User $editor
         * @param Title $title
         * @param string $timestamp
         * @param string $summary
         * @param bool $minorEdit
         * @param bool $oldid (default: false)
         * @param string $pageStatus (default: 'changed')
         */
        public function notifyOnPageChange( $editor, $title, $timestamp, $summary,
                $minorEdit, $oldid = false, $pageStatus = 'changed'
        ) {
                global $wgEnotifMinorEdits, $wgUsersNotifiedOnAllChanges, $wgEnotifUserTalk;

                if ( $title->getNamespace() < 0 ) {
                        return;
                }

                // update wl_notificationtimestamp for watchers
                $config = RequestContext::getMain()->getConfig();
                $watchers = [];
                if ( $config->get( 'EnotifWatchlist' ) || $config->get( 'ShowUpdatedMarker' ) ) {
                        $watchers = MediaWikiServices::getInstance()->getWatchedItemStore()->updateNotificationTimestamp(
                                $editor,
                                $title,
                                $timestamp
                        );
                }

                $sendEmail = true;
                // $watchers deals with $wgEnotifWatchlist.
                // If nobody is watching the page, and there are no users notified on all changes
                // don't bother creating a job/trying to send emails, unless it's a
                // talk page with an applicable notification.
                if ( !count( $watchers ) && !count( $wgUsersNotifiedOnAllChanges ) ) {
                        $sendEmail = false;
                        // Only send notification for non minor edits, unless $wgEnotifMinorEdits
                        if ( !$minorEdit || ( $wgEnotifMinorEdits && !$editor->isAllowed( 'nominornewtalk' ) ) ) {
                                $isUserTalkPage = ( $title->getNamespace() == NS_USER_TALK );
                                if ( $wgEnotifUserTalk
                                        && $isUserTalkPage
                                        && $this->canSendUserTalkEmail( $editor, $title, $minorEdit )
                                ) {
                                        $sendEmail = true;
                                }
                        }
                }

                if ( $sendEmail ) {
                        JobQueueGroup::singleton()->lazyPush( new EnotifNotifyJob(
                                $title,
                                [
                                        'editor' => $editor->getName(),
                                        'editorID' => $editor->getId(),
                                        'timestamp' => $timestamp,
                                        'summary' => $summary,
                                        'minorEdit' => $minorEdit,
                                        'oldid' => $oldid,
                                        'watchers' => $watchers,
                                        'pageStatus' => $pageStatus
                                ]
                        ) );
                }
        }

        /**
         * Immediate version of notifyOnPageChange().
         *
         * Send emails corresponding to the user $editor editing the page $title.
         *
         * @note Do not call directly. Use notifyOnPageChange so that wl_notificationtimestamp is updated.
         * @param User $editor
         * @param Title $title
         * @param string $timestamp Edit timestamp
         * @param string $summary Edit summary
         * @param bool $minorEdit
         * @param int $oldid Revision ID
         * @param array $watchers Array of user IDs
         * @param string $pageStatus
         * @throws MWException
         */
        public function actuallyNotifyOnPageChange( $editor, $title, $timestamp, $summary, $minorEdit,
                $oldid, $watchers, $pageStatus = 'changed' ) {
                # we use $wgPasswordSender as sender's address
                global $wgUsersNotifiedOnAllChanges;
                global $wgEnotifWatchlist, $wgBlockDisablesLogin;
                global $wgEnotifMinorEdits, $wgEnotifUserTalk;

                # The following code is only run, if several conditions are met:
                # 1. EmailNotification for pages (other than user_talk pages) must be enabled
                # 2. minor edits (changes) are only regarded if the global flag indicates so

                $isUserTalkPage = ( $title->getNamespace() == NS_USER_TALK );

                $this->title = $title;
                $this->timestamp = $timestamp;
                $this->summary = $summary;
                $this->minorEdit = $minorEdit;
                $this->oldid = $oldid;
                $this->editor = $editor;
                $this->composed_common = false;
                $this->pageStatus = $pageStatus;

                $formattedPageStatus = [ 'deleted', 'created', 'moved', 'restored', 'changed' ];

                Hooks::run( 'UpdateUserMailerFormattedPageStatus', [ &$formattedPageStatus ] );
                if ( !in_array( $this->pageStatus, $formattedPageStatus ) ) {
                        throw new MWException( 'Not a valid page status!' );
                }

                $userTalkId = false;

                if ( !$minorEdit || ( $wgEnotifMinorEdits && !$editor->isAllowed( 'nominornewtalk' ) ) ) {
                        if ( $wgEnotifUserTalk
                                && $isUserTalkPage
                                && $this->canSendUserTalkEmail( $editor, $title, $minorEdit )
                        ) {
                                $targetUser = User::newFromName( $title->getText() );
                                $this->compose( $targetUser, self::USER_TALK );
                                $userTalkId = $targetUser->getId();
                        }

                        if ( $wgEnotifWatchlist ) {
                                // Send updates to watchers other than the current editor
                                // and don't send to watchers who are blocked and cannot login
                                $userArray = UserArray::newFromIDs( $watchers );
                                foreach ( $userArray as $watchingUser ) {
                                        if ( $watchingUser->getOption( 'enotifwatchlistpages' )
                                                && ( !$minorEdit || $watchingUser->getOption( 'enotifminoredits' ) )
                                                && $watchingUser->isEmailConfirmed()
                                                && $watchingUser->getId() != $userTalkId
                                                && !in_array( $watchingUser->getName(), $wgUsersNotifiedOnAllChanges )
                                                && !( $wgBlockDisablesLogin && $watchingUser->isBlocked() )
                                        ) {
                                                if ( Hooks::run( 'SendWatchlistEmailNotification', [ $watchingUser, $title, $this ] ) ) {
                                                        $this->compose( $watchingUser, self::WATCHLIST );
                                                }
                                        }
                                }
                        }
                }

                foreach ( $wgUsersNotifiedOnAllChanges as $name ) {
                        if ( $editor->getName() == $name ) {
                                // No point notifying the user that actually made the change!
                                continue;
                        }
                        $user = User::newFromName( $name );
                        $this->compose( $user, self::ALL_CHANGES );
                }

                $this->sendMails();
        }

        /**
         * @param User $editor
         * @param Title $title
         * @param bool $minorEdit
         * @return bool
         */
        private function canSendUserTalkEmail( $editor, $title, $minorEdit ) {
                global $wgEnotifUserTalk, $wgBlockDisablesLogin;
                $isUserTalkPage = ( $title->getNamespace() == NS_USER_TALK );

                if ( $wgEnotifUserTalk && $isUserTalkPage ) {
                        $targetUser = User::newFromName( $title->getText() );

                        if ( !$targetUser || $targetUser->isAnon() ) {
                                wfDebug( __METHOD__ . ": user talk page edited, but user does not exist\n" );
                        } elseif ( $targetUser->getId() == $editor->getId() ) {
                                wfDebug( __METHOD__ . ": user edited their own talk page, no notification sent\n" );
                        } elseif ( $wgBlockDisablesLogin && $targetUser->isBlocked() ) {
                                wfDebug( __METHOD__ . ": talk page owner is blocked and cannot login, no notification sent\n" );
                        } elseif ( $targetUser->getOption( 'enotifusertalkpages' )
                                && ( !$minorEdit || $targetUser->getOption( 'enotifminoredits' ) )
                        ) {
                                if ( !$targetUser->isEmailConfirmed() ) {
                                        wfDebug( __METHOD__ . ": talk page owner doesn't have validated email\n" );
                                } elseif ( !Hooks::run( 'AbortTalkPageEmailNotification', [ $targetUser, $title ] ) ) {
                                        wfDebug( __METHOD__ . ": talk page update notification is aborted for this user\n" );
                                } else {
                                        wfDebug( __METHOD__ . ": sending talk page update notification\n" );
                                        return true;
                                }
                        } else {
                                wfDebug( __METHOD__ . ": talk page owner doesn't want notifications\n" );
                        }
                }
                return false;
        }

        /**
         * Generate the generic "this page has been changed" e-mail text.
         */
        private function composeCommonMailtext() {
                global $wgPasswordSender, $wgNoReplyAddress;
                global $wgEnotifFromEditor, $wgEnotifRevealEditorAddress;
                global $wgEnotifImpersonal, $wgEnotifUseRealName;

                $this->composed_common = true;

                # You as the WikiAdmin and Sysops can make use of plenty of
                # named variables when composing your notification emails while
                # simply editing the Meta pages

                $keys = [];
                $postTransformKeys = [];
                $pageTitleUrl = $this->title->getCanonicalURL();
                $pageTitle = $this->title->getPrefixedText();

                if ( $this->oldid ) {
                        // Always show a link to the diff which triggered the mail. See bug 32210.
                        $keys['$NEWPAGE'] = "\n\n" . wfMessage( 'enotif_lastdiff',
                                        $this->title->getCanonicalURL( [ 'diff' => 'next', 'oldid' => $this->oldid ] ) )
                                        ->inContentLanguage()->text();

                        if ( !$wgEnotifImpersonal ) {
                                // For personal mail, also show a link to the diff of all changes
                                // since last visited.
                                $keys['$NEWPAGE'] .= "\n\n" . wfMessage( 'enotif_lastvisited',
                                                $this->title->getCanonicalURL( [ 'diff' => '0', 'oldid' => $this->oldid ] ) )
                                                ->inContentLanguage()->text();
                        }
                        $keys['$OLDID'] = $this->oldid;
                        // Deprecated since MediaWiki 1.21, not used by default. Kept for backwards-compatibility.
                        $keys['$CHANGEDORCREATED'] = wfMessage( 'changed' )->inContentLanguage()->text();
                } else {
                        # clear $OLDID placeholder in the message template
                        $keys['$OLDID'] = '';
                        $keys['$NEWPAGE'] = '';
                        // Deprecated since MediaWiki 1.21, not used by default. Kept for backwards-compatibility.
                        $keys['$CHANGEDORCREATED'] = wfMessage( 'created' )->inContentLanguage()->text();
                }

                $keys['$PAGETITLE'] = $this->title->getPrefixedText();
                $keys['$PAGETITLE_URL'] = $this->title->getCanonicalURL();
                $keys['$PAGEMINOREDIT'] = $this->minorEdit ?
                        wfMessage( 'minoredit' )->inContentLanguage()->text() : '';
                $keys['$UNWATCHURL'] = $this->title->getCanonicalURL( 'action=unwatch' );

                if ( $this->editor->isAnon() ) {
                        # real anon (user:xxx.xxx.xxx.xxx)
                        $keys['$PAGEEDITOR'] = wfMessage( 'enotif_anon_editor', $this->editor->getName() )
                                ->inContentLanguage()->text();
                        $keys['$PAGEEDITOR_EMAIL'] = wfMessage( 'noemailtitle' )->inContentLanguage()->text();

                } else {
                        $keys['$PAGEEDITOR'] = $wgEnotifUseRealName && $this->editor->getRealName() !== ''
                                ? $this->editor->getRealName() : $this->editor->getName();
                        $emailPage = SpecialPage::getSafeTitleFor( 'Emailuser', $this->editor->getName() );
                        $keys['$PAGEEDITOR_EMAIL'] = $emailPage->getCanonicalURL();
                }

                $keys['$PAGEEDITOR_WIKI'] = $this->editor->getUserPage()->getCanonicalURL();
                $keys['$HELPPAGE'] = wfExpandUrl(
                        Skin::makeInternalOrExternalUrl( wfMessage( 'helppage' )->inContentLanguage()->text() )
                );

                # Replace this after transforming the message, bug 35019
                $postTransformKeys['$PAGESUMMARY'] = $this->summary == '' ? ' - ' : $this->summary;

                // Now build message's subject and body

                // Messages:
                // enotif_subject_deleted, enotif_subject_created, enotif_subject_moved,
                // enotif_subject_restored, enotif_subject_changed
                $this->subject = wfMessage( 'enotif_subject_' . $this->pageStatus )->inContentLanguage()
                        ->params( $pageTitle, $keys['$PAGEEDITOR'] )->text();

                // Messages:
                // enotif_body_intro_deleted, enotif_body_intro_created, enotif_body_intro_moved,
                // enotif_body_intro_restored, enotif_body_intro_changed
                $keys['$PAGEINTRO'] = wfMessage( 'enotif_body_intro_' . $this->pageStatus )
                        ->inContentLanguage()->params( $pageTitle, $keys['$PAGEEDITOR'], $pageTitleUrl )
                        ->text();

                $body = wfMessage( 'enotif_body' )->inContentLanguage()->plain();
                $body = strtr( $body, $keys );
                $body = MessageCache::singleton()->transform( $body, false, null, $this->title );
                $this->body = wordwrap( strtr( $body, $postTransformKeys ), 72 );

                # Reveal the page editor's address as REPLY-TO address only if
                # the user has not opted-out and the option is enabled at the
                # global configuration level.
                $adminAddress = new MailAddress( $wgPasswordSender,
                        wfMessage( 'emailsender' )->inContentLanguage()->text() );
                if ( $wgEnotifRevealEditorAddress
                        && ( $this->editor->getEmail() != '' )
                        && $this->editor->getOption( 'enotifrevealaddr' )
                ) {
                        $editorAddress = MailAddress::newFromUser( $this->editor );
                        if ( $wgEnotifFromEditor ) {
                                $this->from = $editorAddress;
                        } else {
                                $this->from = $adminAddress;
                                $this->replyto = $editorAddress;
                        }
                } else {
                        $this->from = $adminAddress;
                        $this->replyto = new MailAddress( $wgNoReplyAddress );
                }
        }

        /**
         * Compose a mail to a given user and either queue it for sending, or send it now,
         * depending on settings.
         *
         * Call sendMails() to send any mails that were queued.
         * @param User $user
         * @param string $source
         */
        function compose( $user, $source ) {
                global $wgEnotifImpersonal;

                if ( !$this->composed_common ) {
                        $this->composeCommonMailtext();
                }

                if ( $wgEnotifImpersonal ) {
                        $this->mailTargets[] = MailAddress::newFromUser( $user );
                } else {
                        $this->sendPersonalised( $user, $source );
                }
        }

        /**
         * Send any queued mails
         */
        function sendMails() {
                global $wgEnotifImpersonal;
                if ( $wgEnotifImpersonal ) {
                        $this->sendImpersonal( $this->mailTargets );
                }
        }

        /**
         * Does the per-user customizations to a notification e-mail (name,
         * timestamp in proper timezone, etc) and sends it out.
         * Returns true if the mail was sent successfully.
         *
         * @param User $watchingUser
         * @param string $source
         * @return bool
         * @private
         */
        function sendPersonalised( $watchingUser, $source ) {
                global $wgContLang, $wgEnotifUseRealName;
                // From the PHP manual:
                //   Note: The to parameter cannot be an address in the form of
                //   "Something <someone@example.com>". The mail command will not parse
                //   this properly while talking with the MTA.
                $to = MailAddress::newFromUser( $watchingUser );

                # $PAGEEDITDATE is the time and date of the page change
                # expressed in terms of individual local time of the notification
                # recipient, i.e. watching user
                $body = str_replace(
                        [ '$WATCHINGUSERNAME',
                                '$PAGEEDITDATE',
                                '$PAGEEDITTIME' ],
                        [ $wgEnotifUseRealName && $watchingUser->getRealName() !== ''
                                ? $watchingUser->getRealName() : $watchingUser->getName(),
                                $wgContLang->userDate( $this->timestamp, $watchingUser ),
                                $wgContLang->userTime( $this->timestamp, $watchingUser ) ],
                        $this->body );

                $headers = [];
                if ( $source === self::WATCHLIST ) {
                        $headers['List-Help'] = 'https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Watchlist';
                }

                return UserMailer::send( $to, $this->from, $this->subject, $body, [
                        'replyTo' => $this->replyto,
                        'headers' => $headers,
                ] );
        }

        /**
         * Same as sendPersonalised but does impersonal mail suitable for bulk
         * mailing.  Takes an array of MailAddress objects.
         * @param MailAddress[] $addresses
         * @return Status|null
         */
        function sendImpersonal( $addresses ) {
                global $wgContLang;

                if ( empty( $addresses ) ) {
                        return null;
                }

                $body = str_replace(
                        [ '$WATCHINGUSERNAME',
                                '$PAGEEDITDATE',
                                '$PAGEEDITTIME' ],
                        [ wfMessage( 'enotif_impersonal_salutation' )->inContentLanguage()->text(),
                                $wgContLang->date( $this->timestamp, false, false ),
                                $wgContLang->time( $this->timestamp, false, false ) ],
                        $this->body );

                return UserMailer::send( $addresses, $this->from, $this->subject, $body, [
                        'replyTo' => $this->replyto,
                ] );
        }

}