3 * @copyright Copyright (C) 2010-2021, the Friendica project
5 * @license GNU AGPL version 3 or any later version
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU Affero General Public License as
9 * published by the Free Software Foundation, either version 3 of the
10 * License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU Affero General Public License for more details.
17 * You should have received a copy of the GNU Affero General Public License
18 * along with this program. If not, see <https://www.gnu.org/licenses/>.
23 use Friendica\Core\Logger;
24 use Friendica\Core\Session;
25 use Friendica\Core\System;
26 use Friendica\Database\DBA;
28 use Friendica\Model\Contact;
29 use Friendica\Model\Profile;
30 use Friendica\Util\Strings;
32 function redir_init(App $a) {
33 if (!Session::isAuthenticated()) {
34 throw new \Friendica\Network\HTTPException\ForbiddenException(DI::l10n()->t('Access denied.'));
37 $url = $_GET['url'] ?? '';
39 if (DI::args()->getArgc() > 1 && intval(DI::args()->getArgv()[1])) {
40 $cid = intval(DI::args()->getArgv()[1]);
45 // Try magic auth before the legacy stuff
46 redir_magic($a, $cid, $url);
49 throw new \Friendica\Network\HTTPException\BadRequestException(DI::l10n()->t('Bad Request.'));
52 $fields = ['id', 'uid', 'nurl', 'url', 'addr', 'name'];
53 $contact = DBA::selectFirst('contact', $fields, ['id' => $cid, 'uid' => [0, local_user()]]);
54 if (!DBA::isResult($contact)) {
55 throw new \Friendica\Network\HTTPException\NotFoundException(DI::l10n()->t('Contact not found.'));
58 $contact_url = $contact['url'];
60 if (!empty($a->getContactId()) && $a->getContactId() == $cid) {
61 // Local user is already authenticated.
62 redir_check_url($contact_url, $url);
63 $a->redirect($url ?: $contact_url);
66 if ($contact['uid'] == 0 && local_user()) {
67 // Let's have a look if there is an established connection
68 // between the public contact we have found and the local user.
69 $contact = DBA::selectFirst('contact', $fields, ['nurl' => $contact['nurl'], 'uid' => local_user()]);
71 if (DBA::isResult($contact)) {
72 $cid = $contact['id'];
75 if (!empty($a->getContactId()) && $a->getContactId() == $cid) {
76 // Local user is already authenticated.
77 redir_check_url($contact_url, $url);
78 $target_url = $url ?: $contact_url;
79 Logger::info($contact['name'] . " is already authenticated. Redirecting to " . $target_url);
80 $a->redirect($target_url);
85 $host = substr(DI::baseUrl()->getUrlPath() . (DI::baseUrl()->getUrlPath() ? '/' . DI::baseUrl()->getUrlPath() : ''), strpos(DI::baseUrl()->getUrlPath(), '://') + 3);
86 $remotehost = substr($contact['addr'], strpos($contact['addr'], '@') + 1);
88 // On a local instance we have to check if the local user has already authenticated
89 // with the local contact. Otherwise the local user would ask the local contact
90 // for authentification everytime he/she is visiting a profile page of the local
92 if (($host == $remotehost) && (Session::getRemoteContactID(Session::get('visitor_visiting')) == Session::get('visitor_id'))) {
93 // Remote user is already authenticated.
94 redir_check_url($contact_url, $url);
95 $target_url = $url ?: $contact_url;
96 Logger::info($contact['name'] . " is already authenticated. Redirecting to " . $target_url);
97 $a->redirect($target_url);
102 throw new \Friendica\Network\HTTPException\BadRequestException(DI::l10n()->t('Bad Request.'));
105 // If we don't have a connected contact, redirect with
106 // the 'zrl' parameter.
107 $my_profile = Profile::getMyURL();
109 if (!empty($my_profile) && !Strings::compareLink($my_profile, $url)) {
110 $separator = strpos($url, '?') ? '&' : '?';
112 $url .= $separator . 'zrl=' . urlencode($my_profile);
115 Logger::info('redirecting to ' . $url);
119 function redir_magic($a, $cid, $url)
121 $visitor = Profile::getMyURL();
122 if (!empty($visitor)) {
123 Logger::info('Got my url', ['visitor' => $visitor]);
126 $contact = DBA::selectFirst('contact', ['url'], ['id' => $cid]);
127 if (!DBA::isResult($contact)) {
128 Logger::info('Contact not found', ['id' => $cid]);
129 throw new \Friendica\Network\HTTPException\NotFoundException(DI::l10n()->t('Contact not found.'));
131 $contact_url = $contact['url'];
132 redir_check_url($contact_url, $url);
133 $target_url = $url ?: $contact_url;
136 $basepath = Contact::getBasepath($contact_url);
138 // We don't use magic auth when there is no visitor, we are on the same system or we visit our own stuff
139 if (empty($visitor) || Strings::compareLink($basepath, DI::baseUrl()) || Strings::compareLink($contact_url, $visitor)) {
140 Logger::info('Redirecting without magic', ['target' => $target_url, 'visitor' => $visitor, 'contact' => $contact_url]);
141 DI::app()->redirect($target_url);
144 // Test for magic auth on the target system
145 $serverret = DI::httpClient()->get($basepath . '/magic');
146 if ($serverret->isSuccess()) {
147 $separator = strpos($target_url, '?') ? '&' : '?';
148 $target_url .= $separator . 'zrl=' . urlencode($visitor) . '&addr=' . urlencode($contact_url);
150 Logger::info('Redirecting with magic', ['target' => $target_url, 'visitor' => $visitor, 'contact' => $contact_url]);
151 System::externalRedirect($target_url);
153 Logger::info('No magic for contact', ['contact' => $contact_url]);
157 function redir_check_url(string $contact_url, string $url)
159 if (empty($contact_url) || empty($url)) {
163 $url_host = parse_url($url, PHP_URL_HOST);
164 if (empty($url_host)) {
165 $url_host = parse_url(DI::baseUrl(), PHP_URL_HOST);
168 $contact_url_host = parse_url($contact_url, PHP_URL_HOST);
170 if ($url_host == $contact_url_host) {
174 Logger::error('URL check host mismatch', ['contact' => $contact_url, 'url' => $url]);
175 throw new \Friendica\Network\HTTPException\ForbiddenException(DI::l10n()->t('Access denied.'));