UserMailer.php

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<?php
class MailAddress {
    function __construct( $address, $name = null, $realName = null ) {
        if ( is_object( $address ) && $address instanceof User ) {
            $this->address = $address->getEmail();
            $this->name = $address->getName();
            $this->realName = $address->getRealName();
        } else {
            $this->address = strval( $address );
            $this->name = strval( $name );
            $this->realName = strval( $realName );
        }
    }

    function toString() {
        # PHP's mail() implementation under Windows is somewhat shite, and
        # can't handle "Joe Bloggs <[email protected]>" format email addresses,
        # so don't bother generating them
        if ( $this->address ) {
            if ( $this->name != '' && !wfIsWindows() ) {
                global $wgEnotifUseRealName;
                $name = ( $wgEnotifUseRealName && $this->realName ) ? $this->realName : $this->name;
                $quoted = UserMailer::quotedPrintable( $name );
                if ( strpos( $quoted, '.' ) !== false || strpos( $quoted, ',' ) !== false ) {
                    $quoted = '"' . $quoted . '"';
                }
                return "$quoted <{$this->address}>";
            } else {
                return $this->address;
            }
        } else {
            return "";
        }
    }

    function __toString() {
        return $this->toString();
    }
}

class UserMailer {
    static $mErrorString;

    protected static function sendWithPear( $mailer, $dest, $headers, $body ) {
        $mailResult = $mailer->send( $dest, $headers, $body );

        # Based on the result return an error string,
        if ( PEAR::isError( $mailResult ) ) {
            wfDebug( "PEAR::Mail failed: " . $mailResult->getMessage() . "\n" );
            return Status::newFatal( 'pear-mail-error', $mailResult->getMessage() );
        } else {
            return Status::newGood();
        }
    }

    static function arrayToHeaderString( $headers, $endl = "\n" ) {
        $strings = array();
        foreach ( $headers as $name => $value ) {
            $strings[] = "$name: $value";
        }
        return implode( $endl, $strings );
    }

    static function makeMsgId() {
        global $wgSMTP, $wgServer;

        $msgid = uniqid( wfWikiID() . ".", true ); /* true required for cygwin */
        if ( is_array( $wgSMTP ) && isset( $wgSMTP['IDHost'] ) && $wgSMTP['IDHost'] ) {
            $domain = $wgSMTP['IDHost'];
        } else {
            $url = wfParseUrl( $wgServer );
            $domain = $url['host'];
        }
        return "<$msgid@$domain>";
    }

    public static function send( $to, $from, $subject, $body, $replyto = null, $contentType = 'text/plain; charset=UTF-8' ) {
        global $wgSMTP, $wgEnotifMaxRecips, $wgAdditionalMailParams, $wgAllowHTMLEmail;
        $mime = null;
        if ( !is_array( $to ) ) {
            $to = array( $to );
        }

        // mail body must have some content
        $minBodyLen = 10;
        // arbitrary but longer than Array or Object to detect casting error

        // body must either be a string or an array with text and body
        if (
            !(
                !is_array( $body ) &&
                strlen( $body ) >= $minBodyLen
            )
            &&
            !(
                is_array( $body ) &&
                isset( $body['text'] ) &&
                isset( $body['html'] ) &&
                strlen( $body['text'] ) >= $minBodyLen &&
                strlen( $body['html'] ) >= $minBodyLen
            )
        ) {
            // if it is neither we have a problem
            return Status::newFatal( 'user-mail-no-body' );
        }

        if ( !$wgAllowHTMLEmail && is_array( $body ) ) {
            // HTML not wanted.  Dump it.
            $body = $body['text'];
        }

        wfDebug( __METHOD__ . ': sending mail to ' . implode( ', ', $to ) . "\n" );

        # Make sure we have at least one address
        $has_address = false;
        foreach ( $to as $u ) {
            if ( $u->address ) {
                $has_address = true;
                break;
            }
        }
        if ( !$has_address ) {
            return Status::newFatal( 'user-mail-no-addy' );
        }

        # Forge email headers
        # -------------------
        #
        # WARNING
        #
        # DO NOT add To: or Subject: headers at this step. They need to be
        # handled differently depending upon the mailer we are going to use.
        #
        # To:
        #  PHP mail() first argument is the mail receiver. The argument is
        #  used as a recipient destination and as a To header.
        #
        #  PEAR mailer has a recipient argument which is only used to
        #  send the mail. If no To header is given, PEAR will set it to
        #  to 'undisclosed-recipients:'.
        #
        #  NOTE: To: is for presentation, the actual recipient is specified
        #  by the mailer using the Rcpt-To: header.
        #
        # Subject:
        #  PHP mail() second argument to pass the subject, passing a Subject
        #  as an additional header will result in a duplicate header.
        #
        #  PEAR mailer should be passed a Subject header.
        #
        # -- hashar 20120218

        $headers['From'] = $from->toString();
        $headers['Return-Path'] = $from->address;

        if ( $replyto ) {
            $headers['Reply-To'] = $replyto->toString();
        }

        $headers['Date'] = MWTimestamp::getLocalInstance()->format( 'r' );
        $headers['Message-ID'] = self::makeMsgId();
        $headers['X-Mailer'] = 'MediaWiki mailer';

        # Line endings need to be different on Unix and Windows due to
        # the bug described at http://trac.wordpress.org/ticket/2603
        if ( wfIsWindows() ) {
            $endl = "\r\n";
        } else {
            $endl = "\n";
        }

        if ( is_array( $body ) ) {
            // we are sending a multipart message
            wfDebug( "Assembling multipart mime email\n" );
            if ( !stream_resolve_include_path( 'Mail/mime.php' ) ) {
                wfDebug( "PEAR Mail_Mime package is not installed. Falling back to text email.\n" );
                // remove the html body for text email fall back
                $body = $body['text'];
            }
            else {
                require_once 'Mail/mime.php';
                if ( wfIsWindows() ) {
                    $body['text'] = str_replace( "\n", "\r\n", $body['text'] );
                    $body['html'] = str_replace( "\n", "\r\n", $body['html'] );
                }
                $mime = new Mail_mime( array( 'eol' => $endl, 'text_charset' => 'UTF-8', 'html_charset' => 'UTF-8' ) );
                $mime->setTXTBody( $body['text'] );
                $mime->setHTMLBody( $body['html'] );
                $body = $mime->get(); // must call get() before headers()
                $headers = $mime->headers( $headers );
            }
        }
        if ( !isset( $mime ) ) {
            // sending text only, either deliberately or as a fallback
            if ( wfIsWindows() ) {
                $body = str_replace( "\n", "\r\n", $body );
            }
            $headers['MIME-Version'] = '1.0';
            $headers['Content-type'] = ( is_null( $contentType ) ?
                'text/plain; charset=UTF-8' : $contentType );
            $headers['Content-transfer-encoding'] = '8bit';
        }

        $ret = wfRunHooks( 'AlternateUserMailer', array( $headers, $to, $from, $subject, $body ) );
        if ( $ret === false ) {
            // the hook implementation will return false to skip regular mail sending
            return Status::newGood();
        } elseif ( $ret !== true ) {
            // the hook implementation will return a string to pass an error message
            return Status::newFatal( 'php-mail-error', $ret );
        }

        if ( is_array( $wgSMTP ) ) {
            #
            # PEAR MAILER
            #

            if ( !stream_resolve_include_path( 'Mail.php' ) ) {
                throw new MWException( 'PEAR mail package is not installed' );
            }
            require_once 'Mail.php';

            wfSuppressWarnings();

            // Create the mail object using the Mail::factory method
            $mail_object =& Mail::factory( 'smtp', $wgSMTP );
            if ( PEAR::isError( $mail_object ) ) {
                wfDebug( "PEAR::Mail factory failed: " . $mail_object->getMessage() . "\n" );
                wfRestoreWarnings();
                return Status::newFatal( 'pear-mail-error', $mail_object->getMessage() );
            }

            wfDebug( "Sending mail via PEAR::Mail\n" );

            $headers['Subject'] = self::quotedPrintable( $subject );

            # When sending only to one recipient, shows it its email using To:
            if ( count( $to ) == 1 ) {
                $headers['To'] = $to[0]->toString();
            }

            # Split jobs since SMTP servers tends to limit the maximum
            # number of possible recipients.
            $chunks = array_chunk( $to, $wgEnotifMaxRecips );
            foreach ( $chunks as $chunk ) {
                $status = self::sendWithPear( $mail_object, $chunk, $headers, $body );
                # FIXME : some chunks might be sent while others are not!
                if ( !$status->isOK() ) {
                    wfRestoreWarnings();
                    return $status;
                }
            }
            wfRestoreWarnings();
            return Status::newGood();
        } else {
            #
            # PHP mail()
            #
            if ( count( $to ) > 1 ) {
                $headers['To'] = 'undisclosed-recipients:;';
            }
            $headers = self::arrayToHeaderString( $headers, $endl );

            wfDebug( "Sending mail via internal mail() function\n" );

            self::$mErrorString = '';
            $html_errors = ini_get( 'html_errors' );
            ini_set( 'html_errors', '0' );
            set_error_handler( 'UserMailer::errorHandler' );

            $safeMode = wfIniGetBool( 'safe_mode' );

            foreach ( $to as $recip ) {
                if ( $safeMode ) {
                    $sent = mail( $recip, self::quotedPrintable( $subject ), $body, $headers );
                } else {
                    $sent = mail( $recip, self::quotedPrintable( $subject ), $body, $headers, $wgAdditionalMailParams );
                }
            }

            restore_error_handler();
            ini_set( 'html_errors', $html_errors );

            if ( self::$mErrorString ) {
                wfDebug( "Error sending mail: " . self::$mErrorString . "\n" );
                return Status::newFatal( 'php-mail-error', self::$mErrorString );
            } elseif ( ! $sent ) {
                // mail function only tells if there's an error
                wfDebug( "Unknown error sending mail\n" );
                return Status::newFatal( 'php-mail-error-unknown' );
            } else {
                return Status::newGood();
            }
        }
    }

    static function errorHandler( $code, $string ) {
        self::$mErrorString = preg_replace( '/^mail\(\)(\s*\[.*?\])?: /', '', $string );
    }

    public static function rfc822Phrase( $phrase ) {
        $phrase = strtr( $phrase, array( "\r" => '', "\n" => '', '"' => '' ) );
        return '"' . $phrase . '"';
    }

    public static function quotedPrintable( $string, $charset = '' ) {
        # Probably incomplete; see RFC 2045
        if ( empty( $charset ) ) {
            $charset = 'UTF-8';
        }
        $charset = strtoupper( $charset );
        $charset = str_replace( 'ISO-8859', 'ISO8859', $charset ); // ?

        $illegal = '\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\xff=';
        $replace = $illegal . '\t ?_';
        if ( !preg_match( "/[$illegal]/", $string ) ) {
            return $string;
        }
        $out = "=?$charset?Q?";
        $out .= preg_replace_callback( "/([$replace])/",
            array( __CLASS__, 'quotedPrintableCallback' ), $string );
        $out .= '?=';
        return $out;
    }

    protected static function quotedPrintableCallback( $matches ) {
        return sprintf( "=%02X", ord( $matches[1] ) );
    }
}

class EmailNotification {
    protected $subject, $body, $replyto, $from;
    protected $timestamp, $summary, $minorEdit, $oldid, $composed_common, $pageStatus;
    protected $mailTargets = array();

    protected $title;

    protected $editor;

    public function notifyOnPageChange( $editor, $title, $timestamp, $summary, $minorEdit, $oldid = false, $pageStatus = 'changed' ) {
        global $wgEnotifUseJobQ, $wgEnotifWatchlist, $wgShowUpdatedMarker, $wgEnotifMinorEdits,
            $wgUsersNotifiedOnAllChanges, $wgEnotifUserTalk;

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

        // Build a list of users to notify
        $watchers = array();
        if ( $wgEnotifWatchlist || $wgShowUpdatedMarker ) {
            $dbw = wfGetDB( DB_MASTER );
            $res = $dbw->select( array( 'watchlist' ),
                array( 'wl_user' ),
                array(
                    'wl_user != ' . intval( $editor->getID() ),
                    'wl_namespace' => $title->getNamespace(),
                    'wl_title' => $title->getDBkey(),
                    'wl_notificationtimestamp IS NULL',
                ), __METHOD__
            );
            foreach ( $res as $row ) {
                $watchers[] = intval( $row->wl_user );
            }
            if ( $watchers ) {
                // Update wl_notificationtimestamp for all watching users except the editor
                $fname = __METHOD__;
                $dbw->onTransactionIdle(
                    function() use ( $dbw, $timestamp, $watchers, $title, $fname ) {
                        $dbw->begin( $fname );
                        $dbw->update( 'watchlist',
                            array( /* SET */
                                'wl_notificationtimestamp' => $dbw->timestamp( $timestamp )
                            ), array( /* WHERE */
                                'wl_user' => $watchers,
                                'wl_namespace' => $title->getNamespace(),
                                'wl_title' => $title->getDBkey(),
                            ), $fname
                        );
                        $dbw->commit( $fname );
                    }
                );
            }
        }

        $sendEmail = true;
        // 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
        // $watchers deals with $wgEnotifWatchlist
        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 ) {
            return;
        }
        if ( $wgEnotifUseJobQ ) {
            $params = array(
                'editor' => $editor->getName(),
                'editorID' => $editor->getID(),
                'timestamp' => $timestamp,
                'summary' => $summary,
                'minorEdit' => $minorEdit,
                'oldid' => $oldid,
                'watchers' => $watchers,
                'pageStatus' => $pageStatus
            );
            $job = new EnotifNotifyJob( $title, $params );
            JobQueueGroup::singleton()->push( $job );
        } else {
            $this->actuallyNotifyOnPageChange( $editor, $title, $timestamp, $summary, $minorEdit, $oldid, $watchers, $pageStatus );
        }
    }

    public function actuallyNotifyOnPageChange( $editor, $title, $timestamp, $summary, $minorEdit,
        $oldid, $watchers, $pageStatus = 'changed' ) {
        # we use $wgPasswordSender as sender's address
        global $wgEnotifWatchlist;
        global $wgEnotifMinorEdits, $wgEnotifUserTalk;

        wfProfileIn( __METHOD__ );

        # 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 = array( 'deleted', 'created', 'moved', 'restored', 'changed' );

        wfRunHooks( 'UpdateUserMailerFormattedPageStatus', array( &$formattedPageStatus ) );
        if ( !in_array( $this->pageStatus, $formattedPageStatus ) ) {
            wfProfileOut( __METHOD__ );
            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 );
                $userTalkId = $targetUser->getId();
            }

            if ( $wgEnotifWatchlist ) {
                // Send updates to watchers other than the current editor
                $userArray = UserArray::newFromIDs( $watchers );
                foreach ( $userArray as $watchingUser ) {
                    if ( $watchingUser->getOption( 'enotifwatchlistpages' ) &&
                        ( !$minorEdit || $watchingUser->getOption( 'enotifminoredits' ) ) &&
                        $watchingUser->isEmailConfirmed() &&
                        $watchingUser->getID() != $userTalkId )
                    {
                        $this->compose( $watchingUser );
                    }
                }
            }
        }

        global $wgUsersNotifiedOnAllChanges;
        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 );
        }

        $this->sendMails();
        wfProfileOut( __METHOD__ );
    }

    private function canSendUserTalkEmail( $editor, $title, $minorEdit ) {
        global $wgEnotifUserTalk;
        $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 ( $targetUser->getOption( 'enotifusertalkpages' ) &&
                ( !$minorEdit || $targetUser->getOption( 'enotifminoredits' ) ) )
            {
                if ( !$targetUser->isEmailConfirmed() ) {
                    wfDebug( __METHOD__ . ": talk page owner doesn't have validated email\n" );
                } elseif ( !wfRunHooks( 'AbortTalkPageEmailNotification', array( $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() {
        global $wgPasswordSender, $wgPasswordSenderName, $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 = array();
        $postTransformKeys = array();
        $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( array( '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( array( 'diff' => '0', 'oldid' => $this->oldid ) ) )
                    ->inContentLanguage()->text();
            }
            $keys['$OLDID'] = $this->oldid;
            // @deprecated Remove in MediaWiki 1.23.
            $keys['$CHANGEDORCREATED'] = wfMessage( 'changed' )->inContentLanguage()->text();
        } else {
            # clear $OLDID placeholder in the message template
            $keys['$OLDID'] = '';
            $keys['$NEWPAGE'] = '';
            // @deprecated Remove in MediaWiki 1.23.
            $keys['$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->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, $wgPasswordSenderName );
        if ( $wgEnotifRevealEditorAddress
            && ( $this->editor->getEmail() != '' )
            && $this->editor->getOption( 'enotifrevealaddr' ) )
        {
            $editorAddress = new MailAddress( $this->editor );
            if ( $wgEnotifFromEditor ) {
                $this->from = $editorAddress;
            } else {
                $this->from = $adminAddress;
                $this->replyto = $editorAddress;
            }
        } else {
            $this->from = $adminAddress;
            $this->replyto = new MailAddress( $wgNoReplyAddress );
        }
    }

    function compose( $user ) {
        global $wgEnotifImpersonal;

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

        if ( $wgEnotifImpersonal ) {
            $this->mailTargets[] = new MailAddress( $user );
        } else {
            $this->sendPersonalised( $user );
        }
    }

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

    function sendPersonalised( $watchingUser ) {
        global $wgContLang, $wgEnotifUseRealName;
        // From the PHP manual:
        //     Note:  The to parameter cannot be an address in the form of "Something <[email protected]>".
        //     The mail command will not parse this properly while talking with the MTA.
        $to = new MailAddress( $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
        $body = str_replace(
            array( '$WATCHINGUSERNAME',
                '$PAGEEDITDATE',
                '$PAGEEDITTIME' ),
            array( $wgEnotifUseRealName ? $watchingUser->getRealName() : $watchingUser->getName(),
                $wgContLang->userDate( $this->timestamp, $watchingUser ),
                $wgContLang->userTime( $this->timestamp, $watchingUser ) ),
            $this->body );

        return UserMailer::send( $to, $this->from, $this->subject, $body, $this->replyto );
    }

    function sendImpersonal( $addresses ) {
        global $wgContLang;

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

        $body = str_replace(
                array( '$WATCHINGUSERNAME',
                    '$PAGEEDITDATE',
                    '$PAGEEDITTIME' ),
                array( 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, $this->replyto );
    }

} # end of class EmailNotification