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<?php
// Copyright © 2021 Adam Spragg
//
// This file is part of emailautoconf
//
// emailautoconf is free software: you can redistribute it and/or modify
// under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// emailautoconf 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with emailautoconf. If not, see
// <https://www.gnu.org/licenses/>.
//
// SPDX-License-Identifier: LGPL-3.0-or-later
// Thunderbird autoconfiguration described at:
// https://wiki.mozilla.org/Thunderbird:Autoconfiguration
// https://wiki.mozilla.org/Thunderbird:Autoconfiguration:ConfigFileFormat
//
// Should be installed at:
// http://autoconfig.[domain]/mail/config-v1.1.xml
// http://[domain]/.well-known/autoconfig/mail/config-v1.1.xml
$request_path = explode("?", $_SERVER['REQUEST_URI'])[0];
if ($request_path == "/mail/config-v1.1.xml"
&& preg_match('/^autoconfig\.(.*)$/', $_SERVER['HTTP_HOST'], $matches))
{
$domain = $matches[1];
}
else if ($request_path == "/.well-known/autoconfig/mail/config-v1.1.xml") {
$domain = $_SERVER['HTTP_HOST'];
}
else {
http_response_code(500);
header('Content-Type: text/plain');
echo "Unable to determine email domain from //".$_SERVER['HTTP_HOST'].$request_path;
exit(1);
}
$IMAP = dns_get_record("_imaps._tcp.".$domain, DNS_SRV)
?: dns_get_record("_imap._tcp.".$domain, DNS_SRV);
$SMTP = dns_get_record("_submission._tcp.".$domain, DNS_SRV);
if (!$IMAP || !$SMTP) {
http_response_code(500);
header('Content-Type: text/plain');
if (!$IMAP) {
echo "Missing/unavailable IMAP(S) SRV record for ".$domain;
}
if (!$SMTP) {
echo "Missing/unavailable Submission SRV record for ".$domain;
}
exit(1);
}
$sitename = getenv("EMAIL_SITENAME") ?: $domain;
$shortname = getenv("EMAIL_SHORTNAME") ?: $sitename;
header('Content-Type: application/xml');
?>
<?xml version="1.0"?>
<clientConfig version="1.1">
<emailProvider id="<?= htmlspecialchars($domain, ENT_XML1) ?>">
<domain><?= htmlspecialchars($domain, ENT_XML1) ?></domain>
<displayName><?= htmlspecialchars($sitename, ENT_XML1) ?></displayName>
<displayShortName><?= htmlspecialchars($shortname, ENT_XML1) ?></displayShortName>
<?php foreach ($IMAP as $srv) { ?>
<incomingServer type="imap">
<hostname><?= htmlspecialchars($srv['target'], ENT_XML1) ?></hostname>
<port><?= htmlspecialchars($srv['port'], ENT_XML1) ?></port>
<socketType>SSL</socketType>
<username>%EMAILLOCALPART%</username>
<authentication>password-cleartext</authentication>
</incomingServer>
<?php } ?>
<?php foreach ($SMTP as $srv) { ?>
<outgoingServer type="smtp">
<hostname><?= htmlspecialchars($srv['target'], ENT_XML1) ?></hostname>
<port><?= htmlspecialchars($srv['port'], ENT_XML1) ?></port>
<socketType>STARTTLS</socketType>
<username>%EMAILLOCALPART%</username>
<authentication>password-cleartext</authentication>
</outgoingServer>
<?php } ?>
</emailProvider>
</clientConfig>
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