EmailNotification.php

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<?php
use MediaWiki\MediaWikiServices;

class EmailNotification {

    const USER_TALK = 'user_talk';
    const WATCHLIST = 'watchlist';
    const ALL_CHANGES = 'all_changes';

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

    protected $title;

    protected $editor;

    public function getPageStatus() {
        return $this->pageStatus;
    }

    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 ( $watchers === [] && !count( $wgUsersNotifiedOnAllChanges ) ) {
            $sendEmail = false;
            // Only send notification for non minor edits, unless $wgEnotifMinorEdits
            if ( !$minorEdit || ( $wgEnotifMinorEdits && !MediaWikiServices::getInstance()
                        ->getPermissionManager()
                        ->userHasRight( $editor, '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
                ]
            ) );
        }
    }

    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;

        $messageCache = MediaWikiServices::getInstance()->getMessageCache();

        # 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 && !MediaWikiServices::getInstance()
                   ->getPermissionManager()
                   ->userHasRight( $editor, 'nominornewtalk' ) )
        ) {
            if ( $wgEnotifUserTalk
                && $isUserTalkPage
                && $this->canSendUserTalkEmail( $editor, $title, $minorEdit )
            ) {
                $targetUser = User::newFromName( $title->getText() );
                $this->compose( $targetUser, self::USER_TALK, $messageCache );
                $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 )
                        // @TODO Partial blocks should not prevent the user from logging in.
                        //       see: https://phabricator.wikimedia.org/T208895
                        && !( $wgBlockDisablesLogin && $watchingUser->getBlock() )
                        && Hooks::run( 'SendWatchlistEmailNotification', [ $watchingUser, $title, $this ] )
                    ) {
                        $this->compose( $watchingUser, self::WATCHLIST, $messageCache );
                    }
                }
            }
        }

        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, $messageCache );
        }

        $this->sendMails();
    }

    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->getBlock() ) {
                // @TODO Partial blocks should not prevent the user from logging in.
                //       see: https://phabricator.wikimedia.org/T208895
                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;
    }

    private function composeCommonMailtext( MessageCache $messageCache ) {
        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 T34210.
            $keys['$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 ?
            "\n\n" . wfMessage( 'enotif_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, T37019
        $postTransformKeys['$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->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 );
        }
    }

    private function compose( $user, $source, MessageCache $messageCache ) {
        global $wgEnotifImpersonal;

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

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

    private function sendMails() {
        global $wgEnotifImpersonal;
        if ( $wgEnotifImpersonal ) {
            $this->sendImpersonal( $this->mailTargets );
        }
    }

    private function sendPersonalised( $watchingUser, $source ) {
        global $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
        $contLang = MediaWikiServices::getInstance()->getContentLanguage();
        $body = str_replace(
            [ '$WATCHINGUSERNAME',
                '$PAGEEDITDATE',
                '$PAGEEDITTIME' ],
            [ $wgEnotifUseRealName && $watchingUser->getRealName() !== ''
                ? $watchingUser->getRealName() : $watchingUser->getName(),
                $contLang->userDate( $this->timestamp, $watchingUser ),
                $contLang->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,
        ] );
    }

    private function sendImpersonal( $addresses ) {
        if ( empty( $addresses ) ) {
            return null;
        }

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

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

}