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PhabricatorMetaMTAMail.php
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Sun, May 26, 21:21

PhabricatorMetaMTAMail.php
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<?php
/*
* Copyright 2011 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* See #394445 for an explanation of why this thing even exists.
*/
class PhabricatorMetaMTAMail extends PhabricatorMetaMTADAO {
const STATUS_QUEUE = 'queued';
const STATUS_SENT = 'sent';
const STATUS_FAIL = 'fail';
const MAX_RETRIES = 250;
const RETRY_DELAY = 5;
protected $parameters;
protected $status;
protected $message;
protected $retryCount;
protected $nextRetry;
protected $relatedPHID;
public function __construct() {
$this->status = self::STATUS_QUEUE;
$this->retryCount = 0;
$this->nextRetry = time();
$this->parameters = array();
parent::__construct();
}
public function getConfiguration() {
return array(
self::CONFIG_SERIALIZATION => array(
'parameters' => self::SERIALIZATION_JSON,
),
) + parent::getConfiguration();
}
protected function setParam($param, $value) {
$this->parameters[$param] = $value;
return $this;
}
protected function getParam($param) {
return idx($this->parameters, $param);
}
/**
* In Gmail, conversations will be broken if you reply to a thread and the
* server sends back a response without referencing your Message-ID, even if
* it references a Message-ID earlier in the thread. To avoid this, use the
* parent email's message ID explicitly if it's available. This overwrites the
* "In-Reply-To" and "References" headers we would otherwise generate. This
* needs to be set whenever an action is triggered by an email message. See
* T251 for more details.
*
* @param string The "Message-ID" of the email which precedes this one.
* @return this
*/
public function setParentMessageID($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 addCCs(array $phids) {
$phids = array_unique($phids);
$this->setParam('cc', $phids);
return $this;
}
public function addHeader($name, $value) {
$this->parameters['headers'][$name] = $value;
return $this;
}
public function addAttachment($data, $filename, $mimetype) {
$this->parameters['attachments'][] = array(
'data' => $data,
'filename' => $filename,
'mimetype' => $mimetype
);
return $this;
}
public function setFrom($from) {
$this->setParam('from', $from);
return $this;
}
public function setReplyTo($reply_to) {
$this->setParam('reply-to', $reply_to);
return $this;
}
public function setSubject($subject) {
$this->setParam('subject', $subject);
return $this;
}
public function setBody($body) {
$this->setParam('body', $body);
return $this;
}
public function getBody() {
return $this->getParam('body');
}
public function setIsHTML($html) {
$this->setParam('is-html', $html);
return $this;
}
public function getSimulatedFailureCount() {
return nonempty($this->getParam('simulated-failures'), 0);
}
public function setSimulatedFailureCount($count) {
$this->setParam('simulated-failures', $count);
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 and attempt to send it
* immediately if the server is configured for immediate sends. When
* applications generate new mail they should generally use this method to
* deliver it. If the server doesn't use immediate sends, this has the same
* effect as calling save(): the mail will eventually be delivered by the
* MetaMTA daemon.
*
* @return this
*/
public function saveAndSend() {
$ret = null;
if (PhabricatorEnv::getEnvConfig('metamta.send-immediately')) {
$ret = $this->sendNow();
} else {
$ret = $this->save();
}
return $ret;
}
public function buildDefaultMailer() {
$class_name = PhabricatorEnv::getEnvConfig('metamta.mail-adapter');
PhutilSymbolLoader::loadClass($class_name);
return newv($class_name, array());
}
/**
* 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("Trying to send an already-sent mail!");
}
if (time() < $this->getNextRetry()) {
throw new Exception("Trying to send an email before next retry!");
}
}
try {
$parameters = $this->parameters;
$phids = array();
foreach ($parameters as $key => $value) {
switch ($key) {
case 'from':
case 'to':
case 'cc':
if (!is_array($value)) {
$value = array($value);
}
foreach (array_filter($value) as $phid) {
$phids[] = $phid;
}
break;
}
}
$handles = id(new PhabricatorObjectHandleData($phids))
->loadHandles();
$params = $this->parameters;
$default = PhabricatorEnv::getEnvConfig('metamta.default-address');
if (empty($params['from'])) {
$mailer->setFrom($default);
} else if (!PhabricatorEnv::getEnvConfig('metamta.can-send-as-user')) {
$from = $params['from'];
$handle = $handles[$from];
if (empty($params['reply-to'])) {
$params['reply-to'] = $handle->getEmail();
$params['reply-to-name'] = $handle->getFullName();
}
$mailer->setFrom(
$default,
$handle->getFullName());
unset($params['from']);
}
$is_first = !empty($params['is-first-message']);
unset($params['is-first-message']);
$reply_to_name = idx($params, 'reply-to-name', '');
unset($params['reply-to-name']);
foreach ($params as $key => $value) {
switch ($key) {
case 'from':
$mailer->setFrom($handles[$value]->getEmail());
break;
case 'reply-to':
$mailer->addReplyTo($value, $reply_to_name);
break;
case 'to':
$emails = array();
foreach ($value as $phid) {
$emails[] = $handles[$phid]->getEmail();
}
$mailer->addTos($emails);
break;
case 'cc':
$emails = array();
foreach ($value as $phid) {
$emails[] = $handles[$phid]->getEmail();
}
$mailer->addCCs($emails);
break;
case 'headers':
foreach ($value as $header_key => $header_value) {
$mailer->addHeader($header_key, $header_value);
}
break;
case 'attachments':
foreach ($value as $attachment) {
$mailer->addAttachment(
$attachment['data'],
$attachment['filename'],
$attachment['mimetype']
);
}
break;
case 'body':
$mailer->setBody($value);
break;
case 'subject':
$mailer->setSubject($value);
break;
case 'is-html':
if ($value) {
$mailer->setIsHTML(true);
}
break;
case 'thread-id':
if ($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;
default:
// Just discard.
}
}
$mailer->addHeader('X-Mail-Transport-Agent', 'MetaMTA');
} catch (Exception $ex) {
$this->setStatus(self::STATUS_FAIL);
$this->setMessage($ex->getMessage());
return $this->save();
}
if ($this->getRetryCount() < $this->getSimulatedFailureCount()) {
$ok = false;
$error = 'Simulated failure.';
} else {
try {
$ok = $mailer->send();
$error = null;
} catch (Exception $ex) {
$ok = false;
$error = $ex->getMessage()."\n".$ex->getTraceAsString();
}
}
if (!$ok) {
$this->setMessage($error);
if ($this->getRetryCount() > self::MAX_RETRIES) {
$this->setStatus(self::STATUS_FAIL);
} else {
$this->setRetryCount($this->getRetryCount() + 1);
$next_retry = time() + ($this->getRetryCount() * self::RETRY_DELAY);
$this->setNextRetry($next_retry);
}
} else {
$this->setStatus(self::STATUS_SENT);
}
return $this->save();
}
public static function getReadableStatus($status_code) {
static $readable = array(
self::STATUS_QUEUE => "Queued for Delivery",
self::STATUS_FAIL => "Delivery Failed",
self::STATUS_SENT => "Sent",
);
$status_code = coalesce($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);
}
}

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