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PhabricatorMetaMTAMail.php
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PhabricatorMetaMTAMail.php
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			<?php

			/**
			* @task recipients Managing Recipients
			*/
			final class PhabricatorMetaMTAMail extends PhabricatorMetaMTADAO {

			const STATUS_QUEUE = 'queued';
			const STATUS_SENT = 'sent';
			const STATUS_FAIL = 'fail';
			const STATUS_VOID = 'void';

			const RETRY_DELAY = 5;

			protected $parameters;
			protected $status;
			protected $message;
			protected $relatedPHID;

			private $recipientExpansionMap;

			public function __construct() {

			$this->status = self::STATUS_QUEUE;
			$this->parameters = array();

			parent::__construct();
			}

			protected function getConfiguration() {
			return array(
			self::CONFIG_SERIALIZATION => array(
			'parameters' => self::SERIALIZATION_JSON,
			),
			self::CONFIG_COLUMN_SCHEMA => array(
			'status' => 'text32',
			'relatedPHID' => 'phid?',

			// T6203/NULLABILITY
			// This should just be empty if there's no body.
			'message' => 'text?',
			),
			self::CONFIG_KEY_SCHEMA => array(
			'status' => array(
			'columns' => array('status'),
			),
			'relatedPHID' => array(
			'columns' => array('relatedPHID'),
			),
			'key_created' => array(
			'columns' => array('dateCreated'),
			),
			),
			) + parent::getConfiguration();
			}

			protected function setParam($param, $value) {
			$this->parameters[$param] = $value;
			return $this;
			}

			protected function getParam($param, $default = null) {
			return idx($this->parameters, $param, $default);
			}

			/**
			* These tags are used to allow users to opt out of receiving certain types
			* of mail, like updates when a task's projects change.
			*
			* @param list<const>
			* @return this
			*/
			public function setMailTags(array $tags) {
			$this->setParam('mailtags', array_unique($tags));
			return $this;
			}

			public function getMailTags() {
			return $this->getParam('mailtags', array());
			}

			/**
			* In Gmail, conversations will be broken if you reply to a thread and the
			* server sends back a response without referencing your Message-ID, even if
			* it references a Message-ID earlier in the thread. To avoid this, use the
			* parent email's message ID explicitly if it's available. This overwrites the
			* "In-Reply-To" and "References" headers we would otherwise generate. This
			* needs to be set whenever an action is triggered by an email message. See
			* T251 for more details.
			*
			* @param string The "Message-ID" of the email which precedes this one.
			* @return this
			*/
			public function setParentMessageID($id) {
			$this->setParam('parent-message-id', $id);
			return $this;
			}

			public function getParentMessageID() {
			return $this->getParam('parent-message-id');
			}

			public function getSubject() {
			return $this->getParam('subject');
			}

			public function addTos(array $phids) {
			$phids = array_unique($phids);
			$this->setParam('to', $phids);
			return $this;
			}

			public function addRawTos(array $raw_email) {

			// Strip addresses down to bare emails, since the MailAdapter API currently
			// requires we pass it just the address (like `alincoln@logcabin.org`), not
			// a full string like `"Abraham Lincoln" <alincoln@logcabin.org>`.
			foreach ($raw_email as $key => $email) {
			$object = new PhutilEmailAddress($email);
			$raw_email[$key] = $object->getAddress();
			}

			$this->setParam('raw-to', $raw_email);
			return $this;
			}

			public function addCCs(array $phids) {
			$phids = array_unique($phids);
			$this->setParam('cc', $phids);
			return $this;
			}

			public function setExcludeMailRecipientPHIDs(array $exclude) {
			$this->setParam('exclude', $exclude);
			return $this;
			}

			private function getExcludeMailRecipientPHIDs() {
			return $this->getParam('exclude', array());
			}

			public function setForceHeraldMailRecipientPHIDs(array $force) {
			$this->setParam('herald-force-recipients', $force);
			return $this;
			}

			private function getForceHeraldMailRecipientPHIDs() {
			return $this->getParam('herald-force-recipients', array());
			}

			public function getTranslation(array $objects) {
			$default_translation = PhabricatorEnv::getEnvConfig('translation.provider');
			$return = null;
			$recipients = array_merge(
			idx($this->parameters, 'to', array()),
			idx($this->parameters, 'cc', array()));
			foreach (array_select_keys($objects, $recipients) as $object) {
			$translation = null;
			if ($object instanceof PhabricatorUser) {
			$translation = $object->getTranslation();
			}
			if (!$translation) {
			$translation = $default_translation;
			}
			if ($return && $translation != $return) {
			return $default_translation;
			}
			$return = $translation;
			}

			if (!$return) {
			$return = $default_translation;
			}

			return $return;
			}

			public function addPHIDHeaders($name, array $phids) {
			$phids = array_unique($phids);
			foreach ($phids as $phid) {
			$this->addHeader($name, '<'.$phid.'>');
			}
			return $this;
			}

			public function addHeader($name, $value) {
			$this->parameters['headers'][] = array($name, $value);
			return $this;
			}

			public function addAttachment(PhabricatorMetaMTAAttachment $attachment) {
			$this->parameters['attachments'][] = $attachment->toDictionary();
			return $this;
			}

			public function getAttachments() {
			$dicts = $this->getParam('attachments');

			$result = array();
			foreach ($dicts as $dict) {
			$result[] = PhabricatorMetaMTAAttachment::newFromDictionary($dict);
			}
			return $result;
			}

			public function setAttachments(array $attachments) {
			assert_instances_of($attachments, 'PhabricatorMetaMTAAttachment');
			$this->setParam('attachments', mpull($attachments, 'toDictionary'));
			return $this;
			}

			public function setFrom($from) {
			$this->setParam('from', $from);
			return $this;
			}

			public function setRawFrom($raw_email, $raw_name) {
			$this->setParam('raw-from', array($raw_email, $raw_name));
			return $this;
			}

			public function setReplyTo($reply_to) {
			$this->setParam('reply-to', $reply_to);
			return $this;
			}

			public function setSubject($subject) {
			$this->setParam('subject', $subject);
			return $this;
			}

			public function setSubjectPrefix($prefix) {
			$this->setParam('subject-prefix', $prefix);
			return $this;
			}

			public function setVarySubjectPrefix($prefix) {
			$this->setParam('vary-subject-prefix', $prefix);
			return $this;
			}

			public function setBody($body) {
			$this->setParam('body', $body);
			return $this;
			}

			public function setHTMLBody($html) {
			$this->setParam('html-body', $html);
			return $this;
			}

			public function getBody() {
			return $this->getParam('body');
			}

			public function getHTMLBody() {
			return $this->getParam('html-body');
			}

			public function setIsErrorEmail($is_error) {
			$this->setParam('is-error', $is_error);
			return $this;
			}

			public function getIsErrorEmail() {
			return $this->getParam('is-error', false);
			}

			public function getToPHIDs() {
			return $this->getParam('to', array());
			}

			public function getRawToAddresses() {
			return $this->getParam('raw-to', array());
			}

			public function getCcPHIDs() {
			return $this->getParam('cc', array());
			}

			/**
			* Force delivery of a message, even if recipients have preferences which
			* would otherwise drop the message.
			*
			* This is primarily intended to let users who don't want any email still
			* receive things like password resets.
			*
			* @param bool True to force delivery despite user preferences.
			* @return this
			*/
			public function setForceDelivery($force) {
			$this->setParam('force', $force);
			return $this;
			}

			public function getForceDelivery() {
			return $this->getParam('force', false);
			}

			/**
			* Flag that this is an auto-generated bulk message and should have bulk
			* headers added to it if appropriate. Broadly, this means some flavor of
			* "Precedence: bulk" or similar, but is implementation and configuration
			* dependent.
			*
			* @param bool True if the mail is automated bulk mail.
			* @return this
			*/
			public function setIsBulk($is_bulk) {
			$this->setParam('is-bulk', $is_bulk);
			return $this;
			}

			/**
			* Use this method to set an ID used for message threading. MetaMTA will
			* set appropriate headers (Message-ID, In-Reply-To, References and
			* Thread-Index) based on the capabilities of the underlying mailer.
			*
			* @param string Unique identifier, appropriate for use in a Message-ID,
			* In-Reply-To or References headers.
			* @param bool If true, indicates this is the first message in the thread.
			* @return this
			*/
			public function setThreadID($thread_id, $is_first_message = false) {
			$this->setParam('thread-id', $thread_id);
			$this->setParam('is-first-message', $is_first_message);
			return $this;
			}

			/**
			* Save a newly created mail to the database. The mail will eventually be
			* delivered by the MetaMTA daemon.
			*
			* @return this
			*/
			public function saveAndSend() {
			return $this->save();
			}

			public function save() {
			if ($this->getID()) {
			return parent::save();
			}

			// NOTE: When mail is sent from CLI scripts that run tasks in-process, we
			// may re-enter this method from within scheduleTask(). The implementation
			// is intended to avoid anything awkward if we end up reentering this
			// method.

			$this->openTransaction();
			// Save to generate a task ID.
			$result = parent::save();

			// Queue a task to send this mail.
			$mailer_task = PhabricatorWorker::scheduleTask(
			'PhabricatorMetaMTAWorker',
			$this->getID(),
			array(
			'priority' => PhabricatorWorker::PRIORITY_ALERTS,
			));

			$this->saveTransaction();

			return $result;
			}

			public function buildDefaultMailer() {
			return PhabricatorEnv::newObjectFromConfig('metamta.mail-adapter');
			}


			/**
			* Attempt to deliver an email immediately, in this process.
			*
			* @param bool Try to deliver this email even if it has already been
			* delivered or is in backoff after a failed delivery attempt.
			* @param PhabricatorMailImplementationAdapter Use a specific mail adapter,
			* instead of the default.
			*
			* @return void
			*/
			public function sendNow(
			$force_send = false,
			PhabricatorMailImplementationAdapter $mailer = null) {

			if ($mailer === null) {
			$mailer = $this->buildDefaultMailer();
			}

			if (!$force_send) {
			if ($this->getStatus() != self::STATUS_QUEUE) {
			throw new Exception(pht('Trying to send an already-sent mail!'));
			}
			}

			try {
			$params = $this->parameters;

			$actors = $this->loadAllActors();
			$deliverable_actors = $this->filterDeliverableActors($actors);

			$default_from = PhabricatorEnv::getEnvConfig('metamta.default-address');
			if (empty($params['from'])) {
			$mailer->setFrom($default_from);
			}

			$is_first = idx($params, 'is-first-message');
			unset($params['is-first-message']);

			$is_threaded = (bool)idx($params, 'thread-id');

			$reply_to_name = idx($params, 'reply-to-name', '');
			unset($params['reply-to-name']);

			$add_cc = array();
			$add_to = array();

			// Only try to use preferences if everything is multiplexed, so we
			// get consistent behavior.
			$use_prefs = self::shouldMultiplexAllMail();

			$prefs = null;
			if ($use_prefs) {

			// If multiplexing is enabled, some recipients will be in "Cc"
			// rather than "To". We'll move them to "To" later (or supply a
			// dummy "To") but need to look for the recipient in either the
			// "To" or "Cc" fields here.
			$target_phid = head(idx($params, 'to', array()));
			if (!$target_phid) {
			$target_phid = head(idx($params, 'cc', array()));
			}

			if ($target_phid) {
			$user = id(new PhabricatorUser())->loadOneWhere(
			'phid = %s',
			$target_phid);
			if ($user) {
			$prefs = $user->loadPreferences();
			}
			}
			}

			foreach ($params as $key => $value) {
			switch ($key) {
			case 'raw-from':
			list($from_email, $from_name) = $value;
			$mailer->setFrom($from_email, $from_name);
			break;
			case 'from':
			$from = $value;
			$actor_email = null;
			$actor_name = null;
			$actor = idx($actors, $from);
			if ($actor) {
			$actor_email = $actor->getEmailAddress();
			$actor_name = $actor->getName();
			}
			$can_send_as_user = $actor_email &&
			PhabricatorEnv::getEnvConfig('metamta.can-send-as-user');

			if ($can_send_as_user) {
			$mailer->setFrom($actor_email, $actor_name);
			} else {
			$from_email = coalesce($actor_email, $default_from);
			$from_name = coalesce($actor_name, pht('Phabricator'));

			if (empty($params['reply-to'])) {
			$params['reply-to'] = $from_email;
			$params['reply-to-name'] = $from_name;
			}

			$mailer->setFrom($default_from, $from_name);
			}
			break;
			case 'reply-to':
			$mailer->addReplyTo($value, $reply_to_name);
			break;
			case 'to':
			$to_phids = $this->expandRecipients($value);
			$to_actors = array_select_keys($deliverable_actors, $to_phids);
			$add_to = array_merge(
			$add_to,
			mpull($to_actors, 'getEmailAddress'));
			break;
			case 'raw-to':
			$add_to = array_merge($add_to, $value);
			break;
			case 'cc':
			$cc_phids = $this->expandRecipients($value);
			$cc_actors = array_select_keys($deliverable_actors, $cc_phids);
			$add_cc = array_merge(
			$add_cc,
			mpull($cc_actors, 'getEmailAddress'));
			break;
			case 'headers':
			foreach ($value as $pair) {
			list($header_key, $header_value) = $pair;

			// NOTE: If we have \n in a header, SES rejects the email.
			$header_value = str_replace("\n", ' ', $header_value);

			$mailer->addHeader($header_key, $header_value);
			}
			break;
			case 'attachments':
			$value = $this->getAttachments();
			foreach ($value as $attachment) {
			$mailer->addAttachment(
			$attachment->getData(),
			$attachment->getFilename(),
			$attachment->getMimeType());
			}
			break;
			case 'subject':
			$subject = array();

			if ($is_threaded) {
			$add_re = PhabricatorEnv::getEnvConfig('metamta.re-prefix');

			if ($prefs) {
			$add_re = $prefs->getPreference(
			PhabricatorUserPreferences::PREFERENCE_RE_PREFIX,
			$add_re);
			}

			if ($add_re) {
			$subject[] = 'Re:';
			}
			}

			$subject[] = trim(idx($params, 'subject-prefix'));

			$vary_prefix = idx($params, 'vary-subject-prefix');
			if ($vary_prefix != '') {
			$use_subject = PhabricatorEnv::getEnvConfig(
			'metamta.vary-subjects');

			if ($prefs) {
			$use_subject = $prefs->getPreference(
			PhabricatorUserPreferences::PREFERENCE_VARY_SUBJECT,
			$use_subject);
			}

			if ($use_subject) {
			$subject[] = $vary_prefix;
			}
			}

			$subject[] = $value;

			$mailer->setSubject(implode(' ', array_filter($subject)));
			break;
			case 'is-bulk':
			if ($value) {
			$mailer->addHeader('Precedence', 'bulk');
			}
			break;
			case 'thread-id':

			// NOTE: Gmail freaks out about In-Reply-To and References which
			// aren't in the form "<string@domain.tld>"; this is also required
			// by RFC 2822, although some clients are more liberal in what they
			// accept.
			$domain = PhabricatorEnv::getEnvConfig('metamta.domain');
			$value = '<'.$value.'@'.$domain.'>';

			if ($is_first && $mailer->supportsMessageIDHeader()) {
			$mailer->addHeader('Message-ID', $value);
			} else {
			$in_reply_to = $value;
			$references = array($value);
			$parent_id = $this->getParentMessageID();
			if ($parent_id) {
			$in_reply_to = $parent_id;
			// By RFC 2822, the most immediate parent should appear last
			// in the "References" header, so this order is intentional.
			$references[] = $parent_id;
			}
			$references = implode(' ', $references);
			$mailer->addHeader('In-Reply-To', $in_reply_to);
			$mailer->addHeader('References', $references);
			}
			$thread_index = $this->generateThreadIndex($value, $is_first);
			$mailer->addHeader('Thread-Index', $thread_index);
			break;
			case 'mailtags':
			// Handled below.
			break;
			case 'subject-prefix':
			case 'vary-subject-prefix':
			// Handled above.
			break;
			default:
			// Just discard.
			}
			}

			$body = idx($params, 'body', '');
			$max = PhabricatorEnv::getEnvConfig('metamta.email-body-limit');
			if (strlen($body) > $max) {
			$body = id(new PhutilUTF8StringTruncator())
			->setMaximumBytes($max)
			->truncateString($body);
			$body .= "\n";
			$body .= pht('(This email was truncated at %d bytes.)', $max);
			}
			$mailer->setBody($body);

			$html_emails = false;
			if ($use_prefs && $prefs) {
			$html_emails = $prefs->getPreference(
			PhabricatorUserPreferences::PREFERENCE_HTML_EMAILS,
			$html_emails);
			}

			if ($html_emails && isset($params['html-body'])) {
			$mailer->setHTMLBody($params['html-body']);
			}

			if (!$add_to && !$add_cc) {
			$this->setStatus(self::STATUS_VOID);
			$this->setMessage(
			pht(
			'Message has no valid recipients: all To/Cc are disabled, '.
			'invalid, or configured not to receive this mail.'));
			return $this->save();
			}

			if ($this->getIsErrorEmail()) {
			$all_recipients = array_merge($add_to, $add_cc);
			if ($this->shouldRateLimitMail($all_recipients)) {
			$this->setStatus(self::STATUS_VOID);
			$this->setMessage(
			pht(
			'This is an error email, but one or more recipients have '.
			'exceeded the error email rate limit. Declining to deliver '.
			'message.'));
			return $this->save();
			}
			}

			if (PhabricatorEnv::getEnvConfig('phabricator.silent')) {
			$this->setStatus(self::STATUS_VOID);
			$this->setMessage(
			pht(
			'Phabricator is running in silent mode. See `%s` '.
			'in the configuration to change this setting.',
			'phabricator.silent'));
			return $this->save();
			}

			$mailer->addHeader('X-Phabricator-Sent-This-Message', 'Yes');
			$mailer->addHeader('X-Mail-Transport-Agent', 'MetaMTA');

			// Some clients respect this to suppress OOF and other auto-responses.
			$mailer->addHeader('X-Auto-Response-Suppress', 'All');

			// If the message has mailtags, filter out any recipients who don't want
			// to receive this type of mail.
			$mailtags = $this->getParam('mailtags');
			if ($mailtags) {
			$tag_header = array();
			foreach ($mailtags as $mailtag) {
			$tag_header[] = '<'.$mailtag.'>';
			}
			$tag_header = implode(', ', $tag_header);
			$mailer->addHeader('X-Phabricator-Mail-Tags', $tag_header);
			}

			// Some mailers require a valid "To:" in order to deliver mail. If we
			// don't have any "To:", try to fill it in with a placeholder "To:".
			// If that also fails, move the "Cc:" line to "To:".
			if (!$add_to) {
			$placeholder_key = 'metamta.placeholder-to-recipient';
			$placeholder = PhabricatorEnv::getEnvConfig($placeholder_key);
			if ($placeholder !== null) {
			$add_to = array($placeholder);
			} else {
			$add_to = $add_cc;
			$add_cc = array();
			}
			}

			$add_to = array_unique($add_to);
			$add_cc = array_diff(array_unique($add_cc), $add_to);

			$mailer->addTos($add_to);
			if ($add_cc) {
			$mailer->addCCs($add_cc);
			}
			} catch (Exception $ex) {
			$this
			->setStatus(self::STATUS_FAIL)
			->setMessage($ex->getMessage())
			->save();

			throw $ex;
			}

			try {
			$ok = $mailer->send();
			if (!$ok) {
			// TODO: At some point, we should clean this up and make all mailers
			// throw.
			throw new Exception(
			pht('Mail adapter encountered an unexpected, unspecified failure.'));
			}

			$this->setStatus(self::STATUS_SENT);
			$this->save();

			return $this;
			} catch (PhabricatorMetaMTAPermanentFailureException $ex) {
			$this
			->setStatus(self::STATUS_FAIL)
			->setMessage($ex->getMessage())
			->save();

			throw $ex;
			} catch (Exception $ex) {
			$this
			->setMessage($ex->getMessage()."\n".$ex->getTraceAsString())
			->save();

			throw $ex;
			}
			}

			public static function getReadableStatus($status_code) {
			$readable = array(
			self::STATUS_QUEUE => pht('Queued for Delivery'),
			self::STATUS_FAIL => pht('Delivery Failed'),
			self::STATUS_SENT => pht('Sent'),
			self::STATUS_VOID => pht('Void'),
			);
			$status_code = coalesce($status_code, '?');
			return idx($readable, $status_code, $status_code);
			}

			private function generateThreadIndex($seed, $is_first_mail) {
			// When threading, Outlook ignores the 'References' and 'In-Reply-To'
			// headers that most clients use. Instead, it uses a custom 'Thread-Index'
			// header. The format of this header is something like this (from
			// camel-exchange-folder.c in Evolution Exchange):

			/* A new post to a folder gets a 27-byte-long thread index. (The value
			* is apparently unique but meaningless.) Each reply to a post gets a
			* 32-byte-long thread index whose first 27 bytes are the same as the
			* parent's thread index. Each reply to any of those gets a
			* 37-byte-long thread index, etc. The Thread-Index header contains a
			* base64 representation of this value.
			*/

			// The specific implementation uses a 27-byte header for the first email
			// a recipient receives, and a random 5-byte suffix (32 bytes total)
			// thereafter. This means that all the replies are (incorrectly) siblings,
			// but it would be very difficult to keep track of the entire tree and this
			// gets us reasonable client behavior.

			$base = substr(md5($seed), 0, 27);
			if (!$is_first_mail) {
			// Not totally sure, but it seems like outlook orders replies by
			// thread-index rather than timestamp, so to get these to show up in the
			// right order we use the time as the last 4 bytes.
			$base .= ' '.pack('N', time());
			}

			return base64_encode($base);
			}

			public static function shouldMultiplexAllMail() {
			return PhabricatorEnv::getEnvConfig('metamta.one-mail-per-recipient');
			}


			/* -( Managing Recipients )------------------------------------------------ */


			/**
			* Get all of the recipients for this mail, after preference filters are
			* applied. This list has all objects to whom delivery will be attempted.
			*
			* Note that this expands recipients into their members, because delivery
			* is never directly attempted to aggregate actors like projects.
			*
			* @return list<phid> A list of all recipients to whom delivery will be
			* attempted.
			* @task recipients
			*/
			public function buildRecipientList() {
			$actors = $this->loadAllActors();
			$actors = $this->filterDeliverableActors($actors);
			return mpull($actors, 'getPHID');
			}

			public function loadAllActors() {
			$actor_phids = $this->getAllActorPHIDs();
			$actor_phids = $this->expandRecipients($actor_phids);
			return $this->loadActors($actor_phids);
			}

			private function getAllActorPHIDs() {
			return array_merge(
			array($this->getParam('from')),
			$this->getToPHIDs(),
			$this->getCcPHIDs());
			}

			/**
			* Expand a list of recipient PHIDs (possibly including aggregate recipients
			* like projects) into a deaggregated list of individual recipient PHIDs.
			* For example, this will expand project PHIDs into a list of the project's
			* members.
			*
			* @param list<phid> List of recipient PHIDs, possibly including aggregate
			* recipients.
			* @return list<phid> Deaggregated list of mailable recipients.
			*/
			private function expandRecipients(array $phids) {
			if ($this->recipientExpansionMap === null) {
			$all_phids = $this->getAllActorPHIDs();
			$this->recipientExpansionMap = id(new PhabricatorMetaMTAMemberQuery())
			->setViewer(PhabricatorUser::getOmnipotentUser())
			->withPHIDs($all_phids)
			->execute();
			}

			$results = array();
			foreach ($phids as $phid) {
			foreach ($this->recipientExpansionMap[$phid] as $recipient_phid) {
			$results[$recipient_phid] = $recipient_phid;
			}
			}

			return array_keys($results);
			}

			private function filterDeliverableActors(array $actors) {
			assert_instances_of($actors, 'PhabricatorMetaMTAActor');
			$deliverable_actors = array();
			foreach ($actors as $phid => $actor) {
			if ($actor->isDeliverable()) {
			$deliverable_actors[$phid] = $actor;
			}
			}
			return $deliverable_actors;
			}

			private function loadActors(array $actor_phids) {
			$actor_phids = array_filter($actor_phids);
			$viewer = PhabricatorUser::getOmnipotentUser();

			$actors = id(new PhabricatorMetaMTAActorQuery())
			->setViewer($viewer)
			->withPHIDs($actor_phids)
			->execute();

			if (!$actors) {
			return array();
			}

			if ($this->getForceDelivery()) {
			// If we're forcing delivery, skip all the opt-out checks. We don't
			// bother annotating reasoning on the mail in this case because it should
			// always be obvious why the mail hit this rule (e.g., it is a password
			// reset mail).
			foreach ($actors as $actor) {
			$actor->setDeliverable(PhabricatorMetaMTAActor::REASON_FORCE);
			}
			return $actors;
			}

			// Exclude explicit recipients.
			foreach ($this->getExcludeMailRecipientPHIDs() as $phid) {
			$actor = idx($actors, $phid);
			if (!$actor) {
			continue;
			}
			$actor->setUndeliverable(PhabricatorMetaMTAActor::REASON_RESPONSE);
			}

			// Before running more rules, save a list of the actors who were
			// deliverable before we started running preference-based rules. This stops
			// us from trying to send mail to disabled users just because a Herald rule
			// added them, for example.
			$deliverable = array();
			foreach ($actors as $phid => $actor) {
			if ($actor->isDeliverable()) {
			$deliverable[] = $phid;
			}
			}

			// For the rest of the rules, order matters. We're going to run all the
			// possible rules in order from weakest to strongest, and let the strongest
			// matching rule win. The weaker rules leave annotations behind which help
			// users understand why the mail was routed the way it was.

			// Exclude the actor if their preferences are set.
			$from_phid = $this->getParam('from');
			$from_actor = idx($actors, $from_phid);
			if ($from_actor) {
			$from_user = id(new PhabricatorPeopleQuery())
			->setViewer($viewer)
			->withPHIDs(array($from_phid))
			->execute();
			$from_user = head($from_user);
			if ($from_user) {
			$pref_key = PhabricatorUserPreferences::PREFERENCE_NO_SELF_MAIL;
			$exclude_self = $from_user
			->loadPreferences()
			->getPreference($pref_key);
			if ($exclude_self) {
			$from_actor->setUndeliverable(PhabricatorMetaMTAActor::REASON_SELF);
			}
			}
			}

			$all_prefs = id(new PhabricatorUserPreferences())->loadAllWhere(
			'userPHID in (%Ls)',
			$actor_phids);
			$all_prefs = mpull($all_prefs, null, 'getUserPHID');

			$value_email = PhabricatorUserPreferences::MAILTAG_PREFERENCE_EMAIL;

			// Exclude all recipients who have set preferences to not receive this type
			// of email (for example, a user who says they don't want emails about task
			// CC changes).
			$tags = $this->getParam('mailtags');
			if ($tags) {
			foreach ($all_prefs as $phid => $prefs) {
			$user_mailtags = $prefs->getPreference(
			PhabricatorUserPreferences::PREFERENCE_MAILTAGS,
			array());

			// The user must have elected to receive mail for at least one
			// of the mailtags.
			$send = false;
			foreach ($tags as $tag) {
			if (((int)idx($user_mailtags, $tag, $value_email)) == $value_email) {
			$send = true;
			break;
			}
			}

			if (!$send) {
			$actors[$phid]->setUndeliverable(
			PhabricatorMetaMTAActor::REASON_MAILTAGS);
			}
			}
			}

			// If recipients were initially deliverable and were added by "Send me an
			// email" Herald rules, annotate them as such and make them deliverable
			// again, overriding any changes made by the "self mail" and "mail tags"
			// settings.
			$force_recipients = $this->getForceHeraldMailRecipientPHIDs();
			$force_recipients = array_fuse($force_recipients);
			if ($force_recipients) {
			foreach ($deliverable as $phid) {
			if (isset($force_recipients[$phid])) {
			$actors[$phid]->setDeliverable(
			PhabricatorMetaMTAActor::REASON_FORCE_HERALD);
			}
			}
			}

			// Exclude recipients who don't want any mail. This rule is very strong
			// and runs last.
			foreach ($all_prefs as $phid => $prefs) {
			$exclude = $prefs->getPreference(
			PhabricatorUserPreferences::PREFERENCE_NO_MAIL,
			false);
			if ($exclude) {
			$actors[$phid]->setUndeliverable(
			PhabricatorMetaMTAActor::REASON_MAIL_DISABLED);
			}
			}

			return $actors;
			}

			private function shouldRateLimitMail(array $all_recipients) {
			try {
			PhabricatorSystemActionEngine::willTakeAction(
			$all_recipients,
			new PhabricatorMetaMTAErrorMailAction(),
			1);
			return false;
			} catch (PhabricatorSystemActionRateLimitException $ex) {
			return true;
			}
			}


			}

phab/src/applications/metamta/storage/PhabricatorMetaMTAMail.php53ef057b1b51production

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phab/src/applications/metamta/storage/PhabricatorMetaMTAMail.php
53ef057b1b51production

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