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phorge/src/applications/metamta/receiver/PhabricatorMailReceiver.php
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PhabricatorMailReceiver.php
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<?php
abstract class PhabricatorMailReceiver extends Phobject {
private $applicationEmail;
public function setApplicationEmail(
PhabricatorMetaMTAApplicationEmail $email) {
$this->applicationEmail = $email;
return $this;
}
public function getApplicationEmail() {
return $this->applicationEmail;
}
abstract public function isEnabled();
abstract public function canAcceptMail(PhabricatorMetaMTAReceivedMail $mail);
final protected function canAcceptApplicationMail(
PhabricatorApplication $app,
PhabricatorMetaMTAReceivedMail $mail) {
$application_emails = id(new PhabricatorMetaMTAApplicationEmailQuery())
->setViewer($this->getViewer())
->withApplicationPHIDs(array($app->getPHID()))
->execute();
foreach ($mail->getToAddresses() as $to_address) {
foreach ($application_emails as $application_email) {
$create_address = $application_email->getAddress();
if ($this->matchAddresses($create_address, $to_address)) {
$this->setApplicationEmail($application_email);
return true;
}
}
}
return false;
}
abstract protected function processReceivedMail(
PhabricatorMetaMTAReceivedMail $mail,
PhabricatorUser $sender);
final public function receiveMail(
PhabricatorMetaMTAReceivedMail $mail,
PhabricatorUser $sender) {
$this->processReceivedMail($mail, $sender);
}
public function getViewer() {
return PhabricatorUser::getOmnipotentUser();
}
public function validateSender(
PhabricatorMetaMTAReceivedMail $mail,
PhabricatorUser $sender) {
$failure_reason = null;
if ($sender->getIsDisabled()) {
$failure_reason = pht(
'Your account (%s) is disabled, so you can not interact with '.
'Phabricator over email.',
$sender->getUsername());
} else if ($sender->getIsStandardUser()) {
if (!$sender->getIsApproved()) {
$failure_reason = pht(
'Your account (%s) has not been approved yet. You can not interact '.
'with Phabricator over email until your account is approved.',
$sender->getUsername());
} else if (PhabricatorUserEmail::isEmailVerificationRequired() &&
!$sender->getIsEmailVerified()) {
$failure_reason = pht(
'You have not verified the email address for your account (%s). '.
'You must verify your email address before you can interact '.
'with Phabricator over email.',
$sender->getUsername());
}
}
if ($failure_reason) {
throw new PhabricatorMetaMTAReceivedMailProcessingException(
MetaMTAReceivedMailStatus::STATUS_DISABLED_SENDER,
$failure_reason);
}
}
/**
* Identifies the sender's user account for a piece of received mail. Note
* that this method does not validate that the sender is who they say they
* are, just that they've presented some credential which corresponds to a
* recognizable user.
*/
public function loadSender(PhabricatorMetaMTAReceivedMail $mail) {
$raw_from = $mail->getHeader('From');
$from = self::getRawAddress($raw_from);
$reasons = array();
// Try to find a user with this email address.
$user = PhabricatorUser::loadOneWithEmailAddress($from);
if ($user) {
return $user;
} else {
$reasons[] = pht(
'This email was sent from "%s", but that address is not recognized by '.
'Phabricator and does not correspond to any known user account.',
$raw_from);
}
// If we missed on "From", try "Reply-To" if we're configured for it.
$raw_reply_to = $mail->getHeader('Reply-To');
if (strlen($raw_reply_to)) {
$reply_to_key = 'metamta.insecure-auth-with-reply-to';
$allow_reply_to = PhabricatorEnv::getEnvConfig($reply_to_key);
if ($allow_reply_to) {
$reply_to = self::getRawAddress($raw_reply_to);
$user = PhabricatorUser::loadOneWithEmailAddress($reply_to);
if ($user) {
return $user;
} else {
$reasons[] = pht(
'Phabricator is configured to authenticate users using the '.
'"Reply-To" header, but the reply address ("%s") on this '.
'message does not correspond to any known user account.',
$raw_reply_to);
}
} else {
$reasons[] = pht(
'(Phabricator is not configured to authenticate users using the '.
'"Reply-To" header, so it was ignored.)');
}
}
// If we don't know who this user is, load or create an external user
// account for them if we're configured for it.
$email_key = 'phabricator.allow-email-users';
$allow_email_users = PhabricatorEnv::getEnvConfig($email_key);
if ($allow_email_users) {
$from_obj = new PhutilEmailAddress($from);
$xuser = id(new PhabricatorExternalAccountQuery())
->setViewer($this->getViewer())
->withAccountTypes(array('email'))
->withAccountDomains(array($from_obj->getDomainName(), 'self'))
->withAccountIDs(array($from_obj->getAddress()))
->requireCapabilities(
array(
PhabricatorPolicyCapability::CAN_VIEW,
PhabricatorPolicyCapability::CAN_EDIT,
))
->loadOneOrCreate();
return $xuser->getPhabricatorUser();
} else {
// NOTE: Currently, we'll always drop this mail (since it's headed to
// an unverified recipient). See T12237. These details are still useful
// because they'll appear in the mail logs and Mail web UI.
$reasons[] = pht(
'Phabricator is also not configured to allow unknown external users '.
'to send mail to the system using just an email address.');
$reasons[] = pht(
'To interact with Phabricator, add this address ("%s") to your '.
'account.',
$raw_from);
}
if ($this->getApplicationEmail()) {
$application_email = $this->getApplicationEmail();
$default_user_phid = $application_email->getConfigValue(
PhabricatorMetaMTAApplicationEmail::CONFIG_DEFAULT_AUTHOR);
if ($default_user_phid) {
$user = id(new PhabricatorUser())->loadOneWhere(
'phid = %s',
$default_user_phid);
if ($user) {
return $user;
}
$reasons[] = pht(
'Phabricator is misconfigured: the application email '.
'"%s" is set to user "%s", but that user does not exist.',
$application_email->getAddress(),
$default_user_phid);
}
}
$reasons = implode("\n\n", $reasons);
throw new PhabricatorMetaMTAReceivedMailProcessingException(
MetaMTAReceivedMailStatus::STATUS_UNKNOWN_SENDER,
$reasons);
}
/**
* Determine if two inbound email addresses are effectively identical. This
* method strips and normalizes addresses so that equivalent variations are
* correctly detected as identical. For example, these addresses are all
* considered to match one another:
*
* "Abraham Lincoln" <alincoln@example.com>
* alincoln@example.com
* <ALincoln@example.com>
* "Abraham" <phabricator+ALINCOLN@EXAMPLE.COM> # With configured prefix.
*
* @param string Email address.
* @param string Another email address.
* @return bool True if addresses match.
*/
public static function matchAddresses($u, $v) {
$u = self::getRawAddress($u);
$v = self::getRawAddress($v);
$u = self::stripMailboxPrefix($u);
$v = self::stripMailboxPrefix($v);
return ($u === $v);
}
/**
* Strip a global mailbox prefix from an address if it is present. Phabricator
* can be configured to prepend a prefix to all reply addresses, which can
* make forwarding rules easier to write. A prefix looks like:
*
* example@phabricator.example.com # No Prefix
* phabricator+example@phabricator.example.com # Prefix "phabricator"
*
* @param string Email address, possibly with a mailbox prefix.
* @return string Email address with any prefix stripped.
*/
public static function stripMailboxPrefix($address) {
$address = id(new PhutilEmailAddress($address))->getAddress();
$prefix_key = 'metamta.single-reply-handler-prefix';
$prefix = PhabricatorEnv::getEnvConfig($prefix_key);
$len = strlen($prefix);
if ($len) {
$prefix = $prefix.'+';
$len = $len + 1;
}
if ($len) {
if (!strncasecmp($address, $prefix, $len)) {
$address = substr($address, strlen($prefix));
}
}
return $address;
}
/**
* Reduce an email address to its canonical form. For example, an address
* like:
*
* "Abraham Lincoln" < ALincoln@example.com >
*
* ...will be reduced to:
*
* alincoln@example.com
*
* @param string Email address in noncanonical form.
* @return string Canonical email address.
*/
public static function getRawAddress($address) {
$address = id(new PhutilEmailAddress($address))->getAddress();
return trim(phutil_utf8_strtolower($address));
}
}

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