1<?php
2/**
3 * Classes used to send e-mails
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 along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 * http://www.gnu.org/copyleft/gpl.html
19 *
20 * @file
21 * @author <brion@pobox.com>
22 * @author <mail@tgries.de>
23 * @author Tim Starling
24 * @author Luke Welling lwelling@wikimedia.org
25 */
26
27use MediaWiki\Mail\UserEmailContact;
28use MediaWiki\MediaWikiServices;
29use MediaWiki\Permissions\Authority;
30use MediaWiki\User\UserIdentity;
31
32/**
33 * This module processes the email notifications when the current page is
34 * changed. It looks up the table watchlist to find out which users are watching
35 * that page.
36 *
37 * The current implementation sends independent emails to each watching user for
38 * the following reason:
39 *
40 * - Each watching user will be notified about the page edit time expressed in
41 * his/her local time (UTC is shown additionally). To achieve this, we need to
42 * find the individual timeoffset of each watching user from the preferences..
43 *
44 * Suggested improvement to slack down the number of sent emails: We could think
45 * of sending out bulk mails (bcc:user1,user2...) for all these users having the
46 * same timeoffset in their preferences.
47 *
48 * Visit the documentation pages under
49 * https://www.mediawiki.org/wiki/Help:Watching_pages
50 *
51 * TODO use UserOptionsLookup and other services, consider converting this to a service
52 */
53class EmailNotification {
54
55	/**
56	 * Notification is due to user's user talk being edited
57	 */
58	private const USER_TALK = 'user_talk';
59	/**
60	 * Notification is due to a watchlisted page being edited
61	 */
62	private const WATCHLIST = 'watchlist';
63	/**
64	 * Notification because user is notified for all changes
65	 */
66	private const ALL_CHANGES = 'all_changes';
67
68	/** @var string */
69	protected $subject = '';
70
71	/** @var string */
72	protected $body = '';
73
74	/** @var MailAddress|null */
75	protected $replyto;
76
77	/** @var MailAddress|null */
78	protected $from;
79
80	/** @var string|null */
81	protected $timestamp;
82
83	/** @var string */
84	protected $summary = '';
85
86	/** @var bool|null */
87	protected $minorEdit;
88
89	/** @var int|null|bool */
90	protected $oldid;
91
92	/** @var bool */
93	protected $composed_common = false;
94
95	/** @var string */
96	protected $pageStatus = '';
97
98	/** @var MailAddress[] */
99	protected $mailTargets = [];
100
101	/** @var Title */
102	protected $title;
103
104	/** @var User */
105	protected $editor;
106
107	/**
108	 * Extensions that have hooks for
109	 * UpdateUserMailerFormattedPageStatus (to provide additional
110	 * pageStatus indicators) need a way to make sure that, when their
111	 * hook is called in SendWatchlistemailNotification, they only
112	 * handle notifications using their pageStatus indicator.
113	 *
114	 * @since 1.33
115	 * @return string
116	 */
117	public function getPageStatus() {
118		return $this->pageStatus;
119	}
120
121	/**
122	 * Send emails corresponding to the user $editor editing the page $title.
123	 *
124	 * May be deferred via the job queue.
125	 *
126	 * @param Authority $editor
127	 * @param Title $title
128	 * @param string $timestamp
129	 * @param string $summary
130	 * @param bool $minorEdit
131	 * @param bool $oldid (default: false)
132	 * @param string $pageStatus (default: 'changed')
133	 * @return bool Whether an email job was created or not.
134	 * @since 1.35 returns a boolean indicating whether an email job was created.
135	 */
136	public function notifyOnPageChange(
137		Authority $editor,
138		$title,
139		$timestamp,
140		$summary,
141		$minorEdit,
142		$oldid = false,
143		$pageStatus = 'changed'
144	): bool {
145		if ( $title->getNamespace() < 0 ) {
146			return false;
147		}
148
149		$mwServices = MediaWikiServices::getInstance();
150		$config = $mwServices->getMainConfig();
151
152		// update wl_notificationtimestamp for watchers
153		$watchers = [];
154		if ( $config->get( 'EnotifWatchlist' ) || $config->get( 'ShowUpdatedMarker' ) ) {
155			$watchers = $mwServices->getWatchedItemStore()->updateNotificationTimestamp(
156				$editor->getUser(),
157				$title,
158				$timestamp
159			);
160		}
161
162		$sendEmail = true;
163		// $watchers deals with $wgEnotifWatchlist.
164		// If nobody is watching the page, and there are no users notified on all changes
165		// don't bother creating a job/trying to send emails, unless it's a
166		// talk page with an applicable notification.
167		if ( $watchers === [] && !count( $config->get( 'UsersNotifiedOnAllChanges' ) ) ) {
168			$sendEmail = false;
169			// Only send notification for non minor edits, unless $wgEnotifMinorEdits
170			if ( !$minorEdit ||
171				( $config->get( 'EnotifMinorEdits' ) && !$editor->isAllowed( 'nominornewtalk' ) )
172			) {
173				$isUserTalkPage = ( $title->getNamespace() === NS_USER_TALK );
174				if ( $config->get( 'EnotifUserTalk' )
175					&& $isUserTalkPage
176					&& $this->canSendUserTalkEmail( $editor->getUser(), $title, $minorEdit )
177				) {
178					$sendEmail = true;
179				}
180			}
181		}
182
183		if ( $sendEmail ) {
184			JobQueueGroup::singleton()->lazyPush( new EnotifNotifyJob(
185				$title,
186				[
187					'editor' => $editor->getUser()->getName(),
188					'editorID' => $editor->getUser()->getId(),
189					'timestamp' => $timestamp,
190					'summary' => $summary,
191					'minorEdit' => $minorEdit,
192					'oldid' => $oldid,
193					'watchers' => $watchers,
194					'pageStatus' => $pageStatus
195				]
196			) );
197		}
198
199		return $sendEmail;
200	}
201
202	/**
203	 * Immediate version of notifyOnPageChange().
204	 *
205	 * Send emails corresponding to the user $editor editing the page $title.
206	 *
207	 * @note Do not call directly. Use notifyOnPageChange so that wl_notificationtimestamp is updated.
208	 * @param Authority $editor
209	 * @param Title $title
210	 * @param string $timestamp Edit timestamp
211	 * @param string $summary Edit summary
212	 * @param bool $minorEdit
213	 * @param int $oldid Revision ID
214	 * @param array $watchers Array of user IDs
215	 * @param string $pageStatus
216	 * @throws MWException
217	 */
218	public function actuallyNotifyOnPageChange(
219		Authority $editor,
220		$title,
221		$timestamp,
222		$summary,
223		$minorEdit,
224		$oldid,
225		$watchers,
226		$pageStatus = 'changed'
227	) {
228		# we use $wgPasswordSender as sender's address
229
230		$mwServices = MediaWikiServices::getInstance();
231		$messageCache = $mwServices->getMessageCache();
232		$config = $mwServices->getMainConfig();
233
234		# The following code is only run, if several conditions are met:
235		# 1. EmailNotification for pages (other than user_talk pages) must be enabled
236		# 2. minor edits (changes) are only regarded if the global flag indicates so
237
238		$isUserTalkPage = ( $title->getNamespace() === NS_USER_TALK );
239
240		$this->title = $title;
241		$this->timestamp = $timestamp;
242		$this->summary = $summary;
243		$this->minorEdit = $minorEdit;
244		$this->oldid = $oldid;
245		$this->editor = MediaWikiServices::getInstance()->getUserFactory()->newFromAuthority( $editor );
246		$this->composed_common = false;
247		$this->pageStatus = $pageStatus;
248
249		$formattedPageStatus = [ 'deleted', 'created', 'moved', 'restored', 'changed' ];
250
251		Hooks::runner()->onUpdateUserMailerFormattedPageStatus( $formattedPageStatus );
252		if ( !in_array( $this->pageStatus, $formattedPageStatus ) ) {
253			throw new MWException( 'Not a valid page status!' );
254		}
255
256		$userTalkId = false;
257
258		if ( !$minorEdit ||
259			( $config->get( 'EnotifMinorEdits' ) && !$editor->isAllowed( 'nominornewtalk' )	)
260		) {
261			if ( $config->get( 'EnotifUserTalk' )
262				&& $isUserTalkPage
263				&& $this->canSendUserTalkEmail( $editor->getUser(), $title, $minorEdit )
264			) {
265				$targetUser = User::newFromName( $title->getText() );
266				$this->compose( $targetUser, self::USER_TALK, $messageCache );
267				$userTalkId = $targetUser->getId();
268			}
269
270			if ( $config->get( 'EnotifWatchlist' ) ) {
271				// Send updates to watchers other than the current editor
272				// and don't send to watchers who are blocked and cannot login
273				$userArray = UserArray::newFromIDs( $watchers );
274				foreach ( $userArray as $watchingUser ) {
275					if ( $watchingUser->getOption( 'enotifwatchlistpages' )
276						&& ( !$minorEdit || $watchingUser->getOption( 'enotifminoredits' ) )
277						&& $watchingUser->isEmailConfirmed()
278						&& $watchingUser->getId() != $userTalkId
279						&& !in_array( $watchingUser->getName(), $config->get( 'UsersNotifiedOnAllChanges' ) )
280						// @TODO Partial blocks should not prevent the user from logging in.
281						//       see: https://phabricator.wikimedia.org/T208895
282						&& !( $config->get( 'BlockDisablesLogin' ) && $watchingUser->getBlock() )
283						&& Hooks::runner()->onSendWatchlistEmailNotification( $watchingUser, $title, $this )
284					) {
285						$this->compose( $watchingUser, self::WATCHLIST, $messageCache );
286					}
287				}
288			}
289		}
290
291		foreach ( $config->get( 'UsersNotifiedOnAllChanges' ) as $name ) {
292			if ( $editor->getUser()->getName() == $name ) {
293				// No point notifying the user that actually made the change!
294				continue;
295			}
296			$user = User::newFromName( $name );
297			$this->compose( $user, self::ALL_CHANGES, $messageCache );
298		}
299
300		$this->sendMails();
301	}
302
303	/**
304	 * @param UserIdentity $editor
305	 * @param Title $title
306	 * @param bool $minorEdit
307	 * @return bool
308	 */
309	private function canSendUserTalkEmail( UserIdentity $editor, $title, $minorEdit ) {
310		$config = MediaWikiServices::getInstance()->getMainConfig();
311		$isUserTalkPage = ( $title->getNamespace() === NS_USER_TALK );
312
313		if ( !$config->get( 'EnotifUserTalk' ) || !$isUserTalkPage ) {
314			return false;
315		}
316
317		$targetUser = User::newFromName( $title->getText() );
318
319		if ( !$targetUser || $targetUser->isAnon() ) {
320			wfDebug( __METHOD__ . ": user talk page edited, but user does not exist" );
321		} elseif ( $targetUser->getId() == $editor->getId() ) {
322			wfDebug( __METHOD__ . ": user edited their own talk page, no notification sent" );
323		} elseif ( $config->get( 'BlockDisablesLogin' ) && $targetUser->getBlock() ) {
324			// @TODO Partial blocks should not prevent the user from logging in.
325			//       see: https://phabricator.wikimedia.org/T208895
326			wfDebug( __METHOD__ . ": talk page owner is blocked and cannot login, no notification sent" );
327		} elseif ( $targetUser->getOption( 'enotifusertalkpages' )
328			&& ( !$minorEdit || $targetUser->getOption( 'enotifminoredits' ) )
329		) {
330			if ( !$targetUser->isEmailConfirmed() ) {
331				wfDebug( __METHOD__ . ": talk page owner doesn't have validated email" );
332			} elseif ( !Hooks::runner()->onAbortTalkPageEmailNotification( $targetUser, $title ) ) {
333				wfDebug( __METHOD__ . ": talk page update notification is aborted for this user" );
334			} else {
335				wfDebug( __METHOD__ . ": sending talk page update notification" );
336				return true;
337			}
338		} else {
339			wfDebug( __METHOD__ . ": talk page owner doesn't want notifications" );
340		}
341		return false;
342	}
343
344	/**
345	 * Generate the generic "this page has been changed" e-mail text.
346	 * @param MessageCache $messageCache
347	 */
348	private function composeCommonMailtext( MessageCache $messageCache ) {
349		$config = MediaWikiServices::getInstance()->getMainConfig();
350
351		$this->composed_common = true;
352
353		# You as the WikiAdmin and Sysops can make use of plenty of
354		# named variables when composing your notification emails while
355		# simply editing the Meta pages
356
357		$keys = [];
358		$postTransformKeys = [];
359		$pageTitleUrl = $this->title->getCanonicalURL();
360		$pageTitle = $this->title->getPrefixedText();
361
362		if ( $this->oldid ) {
363			// Always show a link to the diff which triggered the mail. See T34210.
364			$keys['$NEWPAGE'] = "\n\n" . wfMessage(
365					'enotif_lastdiff',
366					$this->title->getCanonicalURL( [ 'diff' => 'next', 'oldid' => $this->oldid ] )
367				)->inContentLanguage()->text();
368
369			if ( !$config->get( 'EnotifImpersonal' ) ) {
370				// For personal mail, also show a link to the diff of all changes
371				// since last visited.
372				$keys['$NEWPAGE'] .= "\n\n" . wfMessage(
373						'enotif_lastvisited',
374						$this->title->getCanonicalURL( [ 'diff' => '0', 'oldid' => $this->oldid ] )
375					)->inContentLanguage()->text();
376			}
377			$keys['$OLDID'] = $this->oldid;
378			// Deprecated since MediaWiki 1.21, not used by default. Kept for backwards-compatibility.
379			$keys['$CHANGEDORCREATED'] = wfMessage( 'changed' )->inContentLanguage()->text();
380		} else {
381			# clear $OLDID placeholder in the message template
382			$keys['$OLDID'] = '';
383			$keys['$NEWPAGE'] = '';
384			// Deprecated since MediaWiki 1.21, not used by default. Kept for backwards-compatibility.
385			$keys['$CHANGEDORCREATED'] = wfMessage( 'created' )->inContentLanguage()->text();
386		}
387
388		$keys['$PAGETITLE'] = $this->title->getPrefixedText();
389		$keys['$PAGETITLE_URL'] = $this->title->getCanonicalURL();
390		$keys['$PAGEMINOREDIT'] = $this->minorEdit ?
391			"\n\n" . wfMessage( 'enotif_minoredit' )->inContentLanguage()->text() :
392			'';
393		$keys['$UNWATCHURL'] = $this->title->getCanonicalURL( 'action=unwatch' );
394
395		if ( !$this->editor->isRegistered() ) {
396			# real anon (user:xxx.xxx.xxx.xxx)
397			$keys['$PAGEEDITOR'] = wfMessage( 'enotif_anon_editor', $this->editor->getName() )
398				->inContentLanguage()->text();
399			$keys['$PAGEEDITOR_EMAIL'] = wfMessage( 'noemailtitle' )->inContentLanguage()->text();
400
401		} else {
402			$keys['$PAGEEDITOR'] = $config->get( 'EnotifUseRealName' ) && $this->editor->getRealName() !== ''
403				? $this->editor->getRealName() : $this->editor->getName();
404			$emailPage = SpecialPage::getSafeTitleFor( 'Emailuser', $this->editor->getName() );
405			$keys['$PAGEEDITOR_EMAIL'] = $emailPage->getCanonicalURL();
406		}
407
408		$keys['$PAGEEDITOR_WIKI'] = $this->editor->getUserPage()->getCanonicalURL();
409		$keys['$HELPPAGE'] = wfExpandUrl(
410			Skin::makeInternalOrExternalUrl( wfMessage( 'helppage' )->inContentLanguage()->text() )
411		);
412
413		# Replace this after transforming the message, T37019
414		$postTransformKeys['$PAGESUMMARY'] = $this->summary == '' ? ' - ' : $this->summary;
415
416		// Now build message's subject and body
417
418		// Messages:
419		// enotif_subject_deleted, enotif_subject_created, enotif_subject_moved,
420		// enotif_subject_restored, enotif_subject_changed
421		$this->subject = wfMessage( 'enotif_subject_' . $this->pageStatus )->inContentLanguage()
422			->params( $pageTitle, $keys['$PAGEEDITOR'] )->text();
423
424		// Messages:
425		// enotif_body_intro_deleted, enotif_body_intro_created, enotif_body_intro_moved,
426		// enotif_body_intro_restored, enotif_body_intro_changed
427		$keys['$PAGEINTRO'] = wfMessage( 'enotif_body_intro_' . $this->pageStatus )
428			->inContentLanguage()
429			->params( $pageTitle, $keys['$PAGEEDITOR'], $pageTitleUrl )
430			->text();
431
432		$body = wfMessage( 'enotif_body' )->inContentLanguage()->plain();
433		$body = strtr( $body, $keys );
434		$body = $messageCache->transform( $body, false, null, $this->title );
435		$this->body = wordwrap( strtr( $body, $postTransformKeys ), 72 );
436
437		# Reveal the page editor's address as REPLY-TO address only if
438		# the user has not opted-out and the option is enabled at the
439		# global configuration level.
440		$adminAddress = new MailAddress(
441			$config->get( 'PasswordSender' ),
442			wfMessage( 'emailsender' )->inContentLanguage()->text()
443		);
444		if ( $config->get( 'EnotifRevealEditorAddress' )
445			&& ( $this->editor->getEmail() != '' )
446			&& $this->editor->getOption( 'enotifrevealaddr' )
447		) {
448			$editorAddress = MailAddress::newFromUser( $this->editor );
449			if ( $config->get( 'EnotifFromEditor' ) ) {
450				$this->from = $editorAddress;
451			} else {
452				$this->from = $adminAddress;
453				$this->replyto = $editorAddress;
454			}
455		} else {
456			$this->from = $adminAddress;
457			$this->replyto = new MailAddress(
458				$config->get( 'NoReplyAddress' )
459			);
460		}
461	}
462
463	/**
464	 * Compose a mail to a given user and either queue it for sending, or send it now,
465	 * depending on settings.
466	 *
467	 * Call sendMails() to send any mails that were queued.
468	 * @param UserEmailContact $user
469	 * @param string $source
470	 * @param MessageCache $messageCache
471	 */
472	private function compose( UserEmailContact $user, $source, MessageCache $messageCache ) {
473		if ( !$this->composed_common ) {
474			$this->composeCommonMailtext( $messageCache );
475		}
476
477		if ( MediaWikiServices::getInstance()->getMainConfig()->get( 'EnotifImpersonal' ) ) {
478			$this->mailTargets[] = MailAddress::newFromUser( $user );
479		} else {
480			$this->sendPersonalised( $user, $source );
481		}
482	}
483
484	/**
485	 * Send any queued mails
486	 */
487	private function sendMails() {
488		if ( MediaWikiServices::getInstance()->getMainConfig()->get( 'EnotifImpersonal' ) ) {
489			$this->sendImpersonal( $this->mailTargets );
490		}
491	}
492
493	/**
494	 * Does the per-user customizations to a notification e-mail (name,
495	 * timestamp in proper timezone, etc) and sends it out.
496	 * Returns Status if email was sent successfully or not (Status::newGood()
497	 * or Status::newFatal() respectively).
498	 *
499	 * @param UserEmailContact $watchingUser
500	 * @param string $source
501	 * @return Status
502	 */
503	private function sendPersonalised( UserEmailContact $watchingUser, $source ) {
504		// From the PHP manual:
505		//   Note: The to parameter cannot be an address in the form of
506		//   "Something <someone@example.com>". The mail command will not parse
507		//   this properly while talking with the MTA.
508		$to = MailAddress::newFromUser( $watchingUser );
509
510		# $PAGEEDITDATE is the time and date of the page change
511		# expressed in terms of individual local time of the notification
512		# recipient, i.e. watching user
513		$mwServices = MediaWikiServices::getInstance();
514		$contLang = $mwServices->getContentLanguage();
515		$watchingUserName = (
516			$mwServices->getMainConfig()->get( 'EnotifUseRealName' ) &&
517			$watchingUser->getRealName() !== ''
518		) ? $watchingUser->getRealName() : $watchingUser->getUser()->getName();
519		$body = str_replace(
520			[
521				'$WATCHINGUSERNAME',
522				'$PAGEEDITDATE',
523				'$PAGEEDITTIME'
524			],
525			[
526				$watchingUserName,
527				$contLang->userDate( $this->timestamp, $watchingUser->getUser() ),
528				$contLang->userTime( $this->timestamp, $watchingUser->getUser() )
529			],
530			$this->body
531		);
532
533		$headers = [];
534		if ( $source === self::WATCHLIST ) {
535			$headers['List-Help'] = 'https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Watchlist';
536		}
537
538		return UserMailer::send( $to, $this->from, $this->subject, $body, [
539			'replyTo' => $this->replyto,
540			'headers' => $headers,
541		] );
542	}
543
544	/**
545	 * Same as sendPersonalised but does impersonal mail suitable for bulk
546	 * mailing.  Takes an array of MailAddress objects.
547	 * @param MailAddress[] $addresses
548	 * @return Status|null
549	 */
550	private function sendImpersonal( $addresses ) {
551		if ( empty( $addresses ) ) {
552			return null;
553		}
554
555		$contLang = MediaWikiServices::getInstance()->getContentLanguage();
556		$body = str_replace(
557			[
558				'$WATCHINGUSERNAME',
559				'$PAGEEDITDATE',
560				'$PAGEEDITTIME'
561			],
562			[
563				wfMessage( 'enotif_impersonal_salutation' )->inContentLanguage()->text(),
564				$contLang->date( $this->timestamp, false, false ),
565				$contLang->time( $this->timestamp, false, false )
566			],
567			$this->body
568		);
569
570		return UserMailer::send( $addresses, $this->from, $this->subject, $body, [
571			'replyTo' => $this->replyto,
572		] );
573	}
574
575}
576