friendica_2021-01/mod/redir.php

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<?php
use Friendica\App;
use Friendica\Core\L10n;
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use Friendica\Core\Logger;
use Friendica\Core\Protocol;
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use Friendica\Core\System;
use Friendica\Database\DBA;
use Friendica\Model\Contact;
use Friendica\Model\Profile;
use Friendica\Util\Strings;
function redir_init(App $a) {
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$url = defaults($_GET, 'url', '');
$quiet = !empty($_GET['quiet']) ? '&quiet=1' : '';
$con_url = defaults($_GET, 'conurl', '');
if ($a->argc > 1 && intval($a->argv[1])) {
$cid = intval($a->argv[1]);
} elseif (local_user() && !empty($con_url)) {
$cid = Contact::getIdForURL($con_url, local_user());
} else {
$cid = 0;
}
if (!empty($cid)) {
$fields = ['id', 'uid', 'nurl', 'url', 'addr', 'name', 'network', 'poll', 'issued-id', 'dfrn-id', 'duplex', 'pending'];
$contact = DBA::selectFirst('contact', $fields, ['id' => $cid, 'uid' => [0, local_user()]]);
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if (!DBA::isResult($contact)) {
notice(L10n::t('Contact not found.'));
$a->internalRedirect();
}
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$contact_url = $contact['url'];
if ($contact['network'] !== Protocol::DFRN // Authentication isn't supported for non DFRN contacts.
|| (!local_user() && !remote_user()) // Visitors (not logged in or not remotes) can't authenticate.
|| (!empty($a->contact['id']) && $a->contact['id'] == $cid)) // Local user is already authenticated.
{
$a->redirect(defaults($url, $contact_url));
}
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if ($contact['uid'] == 0 && local_user()) {
// Let's have a look if there is an established connection
// between the puplic contact we have found and the local user.
$contact = DBA::selectFirst('contact', $fields, ['nurl' => $contact['nurl'], 'uid' => local_user()]);
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if (DBA::isResult($contact)) {
$cid = $contact['id'];
}
if (!empty($a->contact['id']) && $a->contact['id'] == $cid) {
// Local user is already authenticated.
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$target_url = defaults($url, $contact_url);
Logger::log($contact['name'] . " is already authenticated. Redirecting to " . $target_url, Logger::DEBUG);
$a->redirect($target_url);
}
}
if (remote_user()) {
$host = substr($a->getBaseURL() . ($a->getURLPath() ? '/' . $a->getURLPath() : ''), strpos($a->getBaseURL(), '://') + 3);
$remotehost = substr($contact['addr'], strpos($contact['addr'], '@') + 1);
// On a local instance we have to check if the local user has already authenticated
// with the local contact. Otherwise the local user would ask the local contact
// for authentification everytime he/she is visiting a profile page of the local
// contact.
if ($host == $remotehost
&& x($_SESSION, 'remote')
&& is_array($_SESSION['remote']))
{
foreach ($_SESSION['remote'] as $v) {
if ($v['uid'] == $_SESSION['visitor_visiting'] && $v['cid'] == $_SESSION['visitor_id']) {
// Remote user is already authenticated.
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$target_url = defaults($url, $contact_url);
Logger::log($contact['name'] . " is already authenticated. Redirecting to " . $target_url, Logger::DEBUG);
$a->redirect($target_url);
}
}
}
}
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// Doing remote auth with dfrn.
if (local_user() && (!empty($contact['dfrn-id']) || !empty($contact['issued-id'])) && empty($contact['pending'])) {
$dfrn_id = $orig_id = (($contact['issued-id']) ? $contact['issued-id'] : $contact['dfrn-id']);
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if ($contact['duplex'] && $contact['issued-id']) {
$orig_id = $contact['issued-id'];
$dfrn_id = '1:' . $orig_id;
}
if ($contact['duplex'] && $contact['dfrn-id']) {
$orig_id = $contact['dfrn-id'];
$dfrn_id = '0:' . $orig_id;
}
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$sec = Strings::getRandomHex();
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$fields = ['uid' => local_user(), 'cid' => $cid, 'dfrn_id' => $dfrn_id,
'sec' => $sec, 'expire' => time() + 45];
DBA::insert('profile_check', $fields);
Logger::log('mod_redir: ' . $contact['name'] . ' ' . $sec, Logger::DEBUG);
$dest = (!empty($url) ? '&destination_url=' . $url : '');
System::externalRedirect($contact['poll'] . '?dfrn_id=' . $dfrn_id
. '&dfrn_version=' . DFRN_PROTOCOL_VERSION . '&type=profile&sec=' . $sec . $dest . $quiet);
}
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$url = defaults($url, $contact_url);
}
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// If we don't have a connected contact, redirect with
// the 'zrl' parameter.
if (!empty($url)) {
$my_profile = Profile::getMyURL();
if (!empty($my_profile) && !Strings::compareLink($my_profile, $url)) {
$separator = strpos($url, '?') ? '&' : '?';
$url .= $separator . 'zrl=' . urlencode($my_profile);
}
Logger::log('redirecting to ' . $url, Logger::DEBUG);
$a->redirect($url);
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}
notice(L10n::t('Contact not found.'));
$a->internalRedirect();
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}