<?php
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU social is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with GNU social.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Utilities for sending email
 *
 * @category  Mail
 * @package   GNUsocial
 * @author    Evan Prodromou <evan@status.net>
 * @author    Zach Copley <zach@status.net>
 * @author    Robin Millette <millette@status.net>
 * @author    Sarven Capadisli <csarven@status.net>
 * @copyright 2008 StatusNet, Inc.
 * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
 */

defined('GNUSOCIAL') || die();

require_once 'Mail.php';

/**
 * return the configured mail backend
 *
 * Uses the $config array to make a mail backend. Cached so it is safe to call
 * more than once.
 *
 * @return Mail backend
 */
function mail_backend()
{
    static $backend = null;
    global $_PEAR;

    if (!$backend) {
        $mail = new Mail();
        $backend = $mail->factory(
            common_config('mail', 'backend'),
            common_config('mail', 'params') ?: []
        );
        if ($_PEAR->isError($backend)) {
            throw new EmailException($backend->getMessage(), $backend->getCode());
        }
    }
    return $backend;
}

/**
 * send an email to one or more recipients
 *
 * @param array  $recipients array of strings with email addresses of recipients
 * @param array  $headers    array mapping strings to strings for email headers
 * @param string $body       body of the email
 *
 * @return boolean success flag
 */
function mail_send($recipients, $headers, $body)
{
    global $_PEAR;

    try {
        // XXX: use Mail_Queue... maybe
        $backend = mail_backend();

        if (!isset($headers['Content-Type'])) {
            $headers['Content-Type'] = 'text/plain; charset=UTF-8';
        }

        assert($backend); // throws an error if it's bad
        $sent = $backend->send($recipients, $headers, $body);
        if ($_PEAR->isError($sent)) {
            throw new EmailException($sent->getMessage(), $sent->getCode());
        }
        return true;
    } catch (PEAR_Exception $e) {
        common_log(
            LOG_ERR,
            "Unable to send email - '{$e->getMessage()}'. "
            . 'Is your mail subsystem set up correctly?'
        );
        return false;
    }
}

/**
 * returns the configured mail domain
 *
 * Defaults to the server name.
 *
 * @return string mail domain, suitable for making email addresses.
 */
function mail_domain()
{
    $maildomain = common_config('mail', 'domain');
    if (!$maildomain) {
        $maildomain = common_config('site', 'server');
    }
    return $maildomain;
}

/**
 * returns a good address for sending email from this server
 *
 * Uses either the configured value or a faked-up value made
 * from the mail domain.
 *
 * @return string notify from address
 */
function mail_notify_from()
{
    $notifyfrom = common_config('mail', 'notifyfrom');

    if (!$notifyfrom) {
        $domain = mail_domain();

        $notifyfrom = '"'. str_replace('"', '\\"', common_config('site', 'name')) .'" <noreply@'.$domain.'>';
    }

    return $notifyfrom;
}

/**
 * sends email to a user
 *
 * @param User   &$user   user to send email to
 * @param string $subject subject of the email
 * @param string $body    body of the email
 * @param array  $headers optional list of email headers
 * @param string $address optional specification of email address
 *
 * @return boolean success flag
 */
function mail_to_user($user, $subject, $body, $headers=array(), $address=null)
{
    if (!$address) {
        $address = $user->email;
    }

    $recipients = $address;
    $profile    = $user->getProfile();

    $headers['Date']    = date("r", time());
    $headers['From']    = mail_notify_from();
    $headers['To']      = $profile->getBestName() . ' <' . $address . '>';
    $headers['Subject'] = $subject;

    return mail_send($recipients, $headers, $body);
}

/**
 * notify a user of subscription by another user
 *
 * This is just a wrapper around the profile-based version.
 *
 * @param User $listenee user who is being subscribed to
 * @param User $listener user who is subscribing
 *
 * @see mail_subscribe_notify_profile()
 *
 * @return void
 */
function mail_subscribe_notify($listenee, $listener)
{
    $other = $listener->getProfile();
    mail_subscribe_notify_profile($listenee, $other);
}

/**
 * notify a user of subscription by a profile (remote or local)
 *
 * This function checks to see if the listenee has an email
 * address and wants subscription notices.
 *
 * @param User    $listenee user who's being subscribed to
 * @param Profile $other    profile of person who's listening
 *
 * @return void
 */
function mail_subscribe_notify_profile($listenee, $other)
{
    if ($other->hasRight(Right::EMAILONSUBSCRIBE) &&
        $listenee->email && $listenee->emailnotifysub) {
        $profile = $listenee->getProfile();

        $name = $profile->getBestName();

        $long_name = $other->getFancyName();

        $recipients = $listenee->email;

        // use the recipient's localization
        common_switch_locale($listenee->language);

        $headers = _mail_prepare_headers('subscribe', $listenee->nickname, $other->nickname);
        $headers['From']    = mail_notify_from();
        $headers['To']      = $name . ' <' . $listenee->email . '>';
        // TRANS: Subject of new-subscriber notification e-mail.
        // TRANS: %1$s is the subscribing user's nickname, %2$s is the StatusNet sitename.
        $headers['Subject'] = sprintf(
            _('%1$s is now following you on %2$s.'),
            $other->getBestName(),
            common_config('site', 'name')
        );

        // TRANS: Main body of new-subscriber notification e-mail.
        // TRANS: %1$s is the subscriber's long name, %2$s is the StatusNet sitename.
        $body = sprintf(
            _('%1$s is now following you on %2$s.'),
            $long_name,
            common_config('site', 'name')
        ) .
                mail_profile_block($other) .
                mail_footer_block();

        // reset localization
        common_switch_locale();
        mail_send($recipients, $headers, $body);
    }
}

function mail_subscribe_pending_notify_profile($listenee, $other)
{
    if ($other->hasRight(Right::EMAILONSUBSCRIBE) &&
        $listenee->email && $listenee->emailnotifysub) {
        $profile = $listenee->getProfile();

        $name = $profile->getBestName();

        $long_name = ($other->fullname) ?
          ($other->fullname . ' (' . $other->nickname . ')') : $other->nickname;

        $recipients = $listenee->email;

        // use the recipient's localization
        common_switch_locale($listenee->language);

        $headers = _mail_prepare_headers('subscribe', $listenee->nickname, $other->nickname);
        $headers['From']    = mail_notify_from();
        $headers['To']      = $name . ' <' . $listenee->email . '>';
        // TRANS: Subject of pending new-subscriber notification e-mail.
        // TRANS: %1$s is the subscribing user's nickname, %2$s is the StatusNet sitename.
        $headers['Subject'] = sprintf(
            _('%1$s would like to listen to '.
                                        'your notices on %2$s.'),
            $other->getBestName(),
            common_config('site', 'name')
        );

        // TRANS: Main body of pending new-subscriber notification e-mail.
        // TRANS: %1$s is the subscriber's long name, %2$s is the StatusNet sitename.
        $body = sprintf(
            _('%1$s would like to listen to your notices on %2$s. ' .
                          'You may approve or reject their subscription at %3$s'),
            $long_name,
            common_config('site', 'name'),
            common_local_url('subqueue', ['nickname' => $listenee->nickname])
        ) .
                mail_profile_block($other) .
                mail_footer_block();

        // reset localization
        common_switch_locale();
        mail_send($recipients, $headers, $body);
    }
}

function mail_footer_block()
{
    // TRANS: Common footer block for StatusNet notification emails.
    // TRANS: %1$s is the StatusNet sitename,
    // TRANS: %2$s is a link to the addressed user's e-mail settings.
    return "\n\n" . sprintf(
        _('Faithfully yours,'.
          "\n".'%1$s.'."\n\n".
          "----\n".
          "Change your email address or ".
          "notification options at ".'%2$s'),
        common_config('site', 'name'),
        common_local_url('emailsettings')
    ) . "\n";
}

/**
 * Format a block of profile info for a plaintext notification email.
 *
 * @param Profile $profile
 * @return string
 */
function mail_profile_block($profile)
{
    // TRANS: Layout for
    // TRANS: %1$s is the subscriber's profile URL, %2$s is the subscriber's location (or empty)
    // TRANS: %3$s is the subscriber's homepage URL (or empty), %4%s is the subscriber's bio (or empty)
    $out = array();
    $out[] = "";
    $out[] = "";
    // TRANS: Profile info line in notification e-mail.
    // TRANS: %s is a URL.
    $out[] = sprintf(_("Profile: %s"), $profile->profileurl);
    if ($profile->location) {
        // TRANS: Profile info line in notification e-mail.
        // TRANS: %s is a location.
        $out[] = sprintf(_("Location: %s"), $profile->location);
    }
    if ($profile->homepage) {
        // TRANS: Profile info line in notification e-mail.
        // TRANS: %s is a homepage.
        $out[] = sprintf(_("Homepage: %s"), $profile->homepage);
    }
    if ($profile->bio) {
        // TRANS: Profile info line in notification e-mail.
        // TRANS: %s is biographical information.
        $out[] = sprintf(_("Bio: %s"), $profile->bio);
    }

    $blocklink = common_local_url('block', array('profileid' => $profile->id));
    // This'll let ModPlus add the remote profile info so it's possible
    // to block remote users directly...
    Event::handle('MailProfileInfoBlockLink', array($profile, &$blocklink));

    // TRANS: This is a paragraph in a new-subscriber e-mail.
    // TRANS: %s is a URL where the subscriber can be reported as abusive.
    $out[] = sprintf(
        _('If you believe this account is being used abusively, ' .
          'you can block them from your subscribers list and ' .
          'report as spam to site administrators at %s.'),
        $blocklink
    );
    $out[] = "";

    return implode("\n", $out);
}

/**
 * notify a user of their new incoming email address
 *
 * User's email and incoming fields should already be updated.
 *
 * @param User $user user with the new address
 *
 * @return void
 */
function mail_new_incoming_notify($user)
{
    $profile = $user->getProfile();

    $name = $profile->getBestName();

    $headers['From']    = $user->incomingemail;
    $headers['To']      = $name . ' <' . $user->email . '>';
    // TRANS: Subject of notification mail for new posting email address.
    // TRANS: %s is the StatusNet sitename.
    $headers['Subject'] = sprintf(
        _('New email address for posting to %s'),
        common_config('site', 'name')
    );

    // TRANS: Body of notification mail for new posting email address.
    // TRANS: %1$s is the StatusNet sitename, %2$s is the e-mail address to send
    // TRANS: to to post by e-mail, %3$s is a URL to more instructions.
    $body = sprintf(
        _("You have a new posting address on %1\$s.\n\n".
          "Send email to %2\$s to post new messages.\n\n".
          "More email instructions at %3\$s."),
        common_config('site', 'name'),
        $user->incomingemail,
        common_local_url('doc', ['title' => 'email'])
    ) .
            mail_footer_block();

    mail_send($user->email, $headers, $body);
}

/**
 * generate a new address for incoming messages
 *
 * @todo check the database for uniqueness
 *
 * @return string new email address for incoming messages
 */
function mail_new_incoming_address()
{
    $prefix = common_confirmation_code(64);
    $suffix = mail_domain();
    return $prefix . '@' . $suffix;
}

/**
 * broadcast a notice to all subscribers with SMS notification on
 *
 * This function sends SMS messages to all users who have sms addresses;
 * have sms notification on; and have sms enabled for this particular
 * subscription.
 *
 * @param Notice $notice The notice to broadcast
 *
 * @return success flag
 */
function mail_broadcast_notice_sms($notice)
{
    // Now, get users subscribed to this profile

    $user = new User();

    $replies = $notice->getReplies();

    $repliesQry = '';
    if (!empty($replies)) {
        $repliesQry = sprintf(
            'OR %s.id IN (%s)',
            $user->escapedTableName(),
            implode(',', $replies)
        );
    }

    $user->query(sprintf(
        'SELECT nickname, smsemail, incomingemail ' .
        'FROM %1$s LEFT JOIN subscription ' .
        'ON %1$s.id = subscription.subscriber ' .
        'AND subscription.subscribed = %2$d ' .
        'AND subscription.subscribed <> subscription.subscriber ' .
        // Users (other than the sender) who `want SMS notices':
        'WHERE %1$s.id <> %2$d ' .
        'AND %1$s.smsemail IS NOT NULL ' .
        'AND %1$s.smsnotify = TRUE ' .
        // ... where either the user _is_ subscribed to the sender
        // (any of the "subscription" fields IS NOT NULL)
        // and wants to get SMS for all of this scribe's notices...
        'AND (subscription.sms = TRUE ' .
        // ... or where the user was mentioned in
        // or replied-to with the notice:
        $repliesQry .
        ')',
        $user->escapedTableName(),
        $notice->profile_id
    ));

    while ($user->fetch()) {
        common_log(
            LOG_INFO,
            'Sending notice ' . $notice->id . ' to ' . $user->smsemail,
            __FILE__
        );
        $success = mail_send_sms_notice_address(
            $notice,
            $user->smsemail,
            $user->incomingemail,
            $user->nickname
        );
        if (!$success) {
            // XXX: Not sure, but I think that's the right thing to do
            common_log(
                LOG_WARNING,
                'Sending notice ' . $notice->id . ' to ' . $user->smsemail . ' FAILED, canceling.',
                __FILE__
            );
            return false;
        }
    }

    $user->free();
    unset($user);

    return true;
}

/**
 * send a notice to a user via SMS
 *
 * A convenience wrapper around mail_send_sms_notice_address()
 *
 * @param Notice $notice notice to send
 * @param User   $user   user to receive notice
 *
 * @see mail_send_sms_notice_address()
 *
 * @return boolean success flag
 */
function mail_send_sms_notice($notice, $user)
{
    return mail_send_sms_notice_address(
        $notice,
        $user->smsemail,
        $user->incomingemail,
        $user->nickname
    );
}

/**
 * send a notice to an SMS email address from a given address
 *
 * We use the user's incoming email address as the "From" address to make
 * replying to notices easier.
 *
 * @param Notice $notice        notice to send
 * @param string $smsemail      email address to send to
 * @param string $incomingemail email address to set as 'from'
 * @param string $nickname      nickname to add to beginning
 *
 * @return boolean success flag
 */
function mail_send_sms_notice_address($notice, $smsemail, $incomingemail, $nickname)
{
    $to = $nickname . ' <' . $smsemail . '>';

    $other = $notice->getProfile();

    common_log(LOG_INFO, 'Sending notice ' . $notice->id .
               ' to ' . $smsemail, __FILE__);

    $headers = array();

    $headers['From']    = ($incomingemail) ? $incomingemail : mail_notify_from();
    $headers['To']      = $to;
    // TRANS: Subject line for SMS-by-email notification messages.
    // TRANS: %s is the posting user's nickname.
    $headers['Subject'] = sprintf(_('%s status'), $other->getBestName());

    $body = $notice->content;

    return mail_send($smsemail, $headers, $body);
}

/**
 * send a message to confirm a claim for an SMS number
 *
 * @param string $code     confirmation code
 * @param string $nickname nickname of user claiming number
 * @param string $address  email address to send the confirmation to
 *
 * @see common_confirmation_code()
 *
 * @return void
 */
function mail_confirm_sms($code, $nickname, $address)
{
    $recipients = $address;

    $headers['From']    = mail_notify_from();
    $headers['To']      = $nickname . ' <' . $address . '>';
    // TRANS: Subject line for SMS-by-email address confirmation message.
    $headers['Subject'] = _('SMS confirmation');

    // TRANS: Main body heading for SMS-by-email address confirmation message.
    // TRANS: %s is the addressed user's nickname.
    $body  = sprintf(_('%s: confirm you own this phone number with this code:'), $nickname);
    $body .= "\n\n";
    $body .= $code;
    $body .= "\n\n";

    mail_send($recipients, $headers, $body);
}

/**
 * send a mail message to notify a user of a 'nudge'
 *
 * @param User $from user nudging
 * @param User $to   user being nudged
 *
 * @return boolean success flag
 */
function mail_notify_nudge($from, $to)
{
    common_switch_locale($to->language);
    // TRANS: Subject for 'nudge' notification email.
    // TRANS: %s is the nudging user.
    $subject = sprintf(_('You have been nudged by %s'), $from->nickname);

    $from_profile = $from->getProfile();

    // TRANS: Body for 'nudge' notification email.
    // TRANS: %1$s is the nuding user's long name, $2$s is the nudging user's nickname,
    // TRANS: %3$s is a URL to post notices at.
    $body = sprintf(
        _('%1$s (%2$s) is wondering what you are up to ' .
          "these days and is inviting you to post some news.\n\n" .
          "So let's hear from you :)\n\n" .
          "%3\$s\n\n" .
          "Don't reply to this email; it won't get to them."),
        $from_profile->getBestName(),
        $from->nickname,
        common_local_url('all', ['nickname' => $to->nickname])
    ) .
            mail_footer_block();
    common_switch_locale();

    $headers = _mail_prepare_headers('nudge', $to->nickname, $from->nickname);

    return mail_to_user($to, $subject, $body, $headers);
}

/**
 * send a message to notify a user of a direct message (DM)
 *
 * This function checks to see if the recipient wants notification
 * of DMs and has a configured email address.
 *
 * @param Notice $message message to notify about
 * @param User   $from    user sending message
 * @param array  $to      users receiving the message
 *
 * @return boolean success code
 */
function mail_notify_message(Notice $message, Profile $from = null, ?array $to = null)
{
    if (is_null($from)) {
        $from = $message->getProfile();
    }

    if (is_null($to)) {
        $to = [];
        foreach ($message->getAttentionProfiles() as $attention) {
            if ($attention->isLocal()) {
                $to[] = $attention;
            }
        }
    }

    $success = true;

    foreach ($to as $t) {
        if (is_null($t->email) || !$t->emailnotifymsg) {
            continue;
        }

        common_switch_locale($t->language);
        // TRANS: Subject for direct-message notification email.
        // TRANS: %s is the sending user's nickname.
        $subject = sprintf(_('New private message from %s'), $from->getNickname());

        // TRANS: Body for direct-message notification email.
        // TRANS: %1$s is the sending user's long name, %2$s is the sending user's nickname,
        // TRANS: %3$s is the message content, %4$s a URL to the message,
        $body = sprintf(
            _("%1\$s (%2\$s) sent you a private message:\n\n".
              "------------------------------------------------------\n".
              "%3\$s\n".
              "------------------------------------------------------\n\n".
              "You can reply to their message here:\n\n".
              "%4\$s\n\n".
              "Don't reply to this email; it won't get to them."),
            $from->getBestName(),
            $from->getNickname(),
            $message->getContent(),
            common_local_url('newmessage', ['to' => $from->getID()])
        ) .
                mail_footer_block();

        $headers = _mail_prepare_headers('message', $t->getNickname(), $from->getNickname());

        common_switch_locale();

        if (!mail_to_user($t, $subject, $body, $headers)) {
            common_log(LOG_ERR, "Failed to notify user:{$t->getID()} about the new message:{$message->getID()} sent by user:{$from->getID()}");
            $success = false;
        }
    }

    return $success;
}

/**
 * Notify a user that they have received an "attn:" message AKA "@-reply"
 *
 * @param Profile $rcpt  The Profile who recevied the notice, should be a local user
 * @param Notice $notice The notice that was sent
 *
 * @return void
 */
function mail_notify_attn(Profile $rcpt, Notice $notice)
{
    if (!$rcpt->isLocal()) {
        return;
    }

    $sender = $notice->getProfile();
    if ($rcpt->sameAs($sender)) {
        return;
    }

    // See if the notice's author who mentions this user is sandboxed
    if (!$sender->hasRight(Right::EMAILONREPLY)) {
        return;
    }

    // If the author has blocked the author, don't spam them with a notification.
    if ($rcpt->hasBlocked($sender)) {
        return;
    }

    $user = $rcpt->getUser();
    if (!$user->receivesEmailNotifications()) {
        return;
    }

    common_switch_locale($user->language);

    if ($notice->hasConversation()) {
        $conversationUrl = common_local_url(
            'conversation',
            ['id' => $notice->conversation]
        ) . '#notice-'.$notice->getID();

        // TRANS: Line in @-reply notification e-mail. %s is conversation URL.
        $conversationEmailText = sprintf(_("The full conversation can be read here:\n\n".
                                           "\t%s"), $conversationUrl) . "\n\n";
    } else {
        $conversationEmailText = '';
    }

    // TRANS: E-mail subject for notice notification.
    // TRANS: %1$s is the "fancy name" for a profile.
    $subject = sprintf(_('%1$s sent a notice to your attention'), $sender->getFancyName());

    // TRANS: Body of @-reply notification e-mail.
    // TRANS: %1$s is the sending user's name, $2$s is the GNU social sitename,
    // TRANS: %3$s is a URL to the notice, %4$s is the notice text,
    // TRANS: %5$s is the text "The full conversation can be read here:" and a URL to the full conversion if it exists (otherwise empty),
    // TRANS: %6$s is a URL to reply to the notice, %7$s is a URL to all @-replies for the addressed user,
    $body = sprintf(
        _("%1\$s just sent a notice to your attention (an '@-reply') on %2\$s.\n\n".
          "The notice is here:\n\n".
          "\t%3\$s\n\n" .
          "It reads:\n\n".
          "\t%4\$s\n\n" .
          "%5\$s" .
          "You can reply back here:\n\n".
          "\t%6\$s\n\n" .
          "The list of all @-replies for you here:\n\n" .
          "%7\$s"),
        $sender->getFancyName(), //%1
        common_config('site', 'name'), //%2
        common_local_url(
            'shownotice',
            ['notice' => $notice->getID()]
        ), //%3
        $notice->getContent(), //%4
        $conversationEmailText, //%5
        common_local_url(
            'newnotice',
            ['replyto' => $sender->getNickname(), 'inreplyto' => $notice->getID()]
        ), //%6
        common_local_url(
            'replies',
            ['nickname' => $rcpt->getNickname()]
        )
    ) . //%7
            mail_footer_block();
    $headers = _mail_prepare_headers('mention', $rcpt->getNickname(), $sender->getNickname());

    common_switch_locale();
    mail_to_user($user, $subject, $body, $headers);
}

/**
 * Prepare the common mail headers used in notification emails
 *
 * @param string $msg_type type of message being sent to the user
 * @param string $to       nickname of the receipient
 * @param string $from     nickname of the user triggering the notification
 *
 * @return array list of mail headers to include in the message
 */
function _mail_prepare_headers($msg_type, $to, $from)
{
    $headers = array(
        'X-StatusNet-MessageType' => $msg_type,
        'X-StatusNet-TargetUser'  => $to,
        'X-StatusNet-SourceUser'  => $from,
        'X-StatusNet-Domain'      => common_config('site', 'server')
    );

    return $headers;
}

/**
 * Send notification emails to group administrator.
 *
 * @param User_group $group
 * @param Profile $joiner
 */
function mail_notify_group_join($group, $joiner)
{
    // This returns a Profile query...
    $admin = $group->getAdmins();
    while ($admin->fetch()) {
        // We need a local user for email notifications...
        $adminUser = User::getKV('id', $admin->id);
        // @fixme check for email preference?
        if ($adminUser && $adminUser->email) {
            // use the recipient's localization
            common_switch_locale($adminUser->language);

            $headers = _mail_prepare_headers('join', $admin->nickname, $joiner->nickname);
            $headers['From']    = mail_notify_from();
            $headers['To']      = $admin->getBestName() . ' <' . $adminUser->email . '>';
            // TRANS: Subject of group join notification e-mail.
            // TRANS: %1$s is the joining user's nickname, %2$s is the group name, and %3$s is the StatusNet sitename.
            $headers['Subject'] = sprintf(
                _('%1$s has joined your group %2$s on %3$s'),
                $joiner->getBestName(),
                $group->getBestName(),
                common_config('site', 'name')
            );

            // TRANS: Main body of group join notification e-mail.
            // TRANS: %1$s is the subscriber's long name, %2$s is the group name, and %3$s is the StatusNet sitename,
            // TRANS: %4$s is a block of profile info about the subscriber.
            // TRANS: %5$s is a link to the addressed user's e-mail settings.
            $body = sprintf(
                _('%1$s has joined your group %2$s on %3$s.'),
                $joiner->getFancyName(),
                $group->getFancyName(),
                common_config('site', 'name')
            ) .
                    mail_profile_block($joiner) .
                    mail_footer_block();

            // reset localization
            common_switch_locale();
            mail_send($adminUser->email, $headers, $body);
        }
    }
}


/**
 * Send notification emails to group administrator.
 *
 * @param User_group $group
 * @param Profile $joiner
 */
function mail_notify_group_join_pending($group, $joiner)
{
    $admin = $group->getAdmins();
    while ($admin->fetch()) {
        // We need a local user for email notifications...
        $adminUser = User::getKV('id', $admin->id);
        // @fixme check for email preference?
        if ($adminUser && $adminUser->email) {
            // use the recipient's localization
            common_switch_locale($adminUser->language);

            $headers = _mail_prepare_headers('join', $admin->nickname, $joiner->nickname);
            $headers['From']    = mail_notify_from();
            $headers['To']      = $admin->getBestName() . ' <' . $adminUser->email . '>';
            // TRANS: Subject of pending group join request notification e-mail.
            // TRANS: %1$s is the joining user's nickname, %2$s is the group name, and %3$s is the StatusNet sitename.
            $headers['Subject'] = sprintf(
                _('%1$s wants to join your group %2$s on %3$s.'),
                $joiner->getBestName(),
                $group->getBestName(),
                common_config('site', 'name')
            );

            // TRANS: Main body of pending group join request notification e-mail.
            // TRANS: %1$s is the subscriber's long name, %2$s is the group name, and %3$s is the StatusNet sitename,
            // TRANS: %4$s is the URL to the moderation queue page.
            $body = sprintf(
                _('%1$s would like to join your group %2$s on %3$s. ' .
                  'You may approve or reject their group membership at %4$s'),
                $joiner->getFancyName(),
                $group->getFancyName(),
                common_config('site', 'name'),
                common_local_url('groupqueue', ['nickname' => $group->nickname])
            ) .
                    mail_profile_block($joiner) .
                    mail_footer_block();

            // reset localization
            common_switch_locale();
            mail_send($adminUser->email, $headers, $body);
        }
    }
}