1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2017 Bjoern Schiessle <bjoern@schiessle.org>
*
* @author Bjoern Schiessle <bjoern@schiessle.org>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Roeland Jago Douma <roeland@famdouma.nl>
*
* @license GNU AGPL version 3 or any later version
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OC\OCS;
use OCP\AppFramework\Http;
use OCP\Http\Client\IClient;
use OCP\Http\Client\IClientService;
use OCP\ICache;
use OCP\ICacheFactory;
use OCP\OCS\IDiscoveryService;
class DiscoveryService implements IDiscoveryService {
/** @var ICache */
private $cache;
/** @var IClient */
private $client;
/**
* @param ICacheFactory $cacheFactory
* @param IClientService $clientService
*/
public function __construct(ICacheFactory $cacheFactory,
IClientService $clientService
) {
$this->cache = $cacheFactory->createDistributed('ocs-discovery');
$this->client = $clientService->newClient();
}
/**
* Discover OCS end-points
*
* If no valid discovery data is found the defaults are returned
*
* @param string $remote
* @param string $service the service you want to discover
* @param bool $skipCache We won't check if the data is in the cache. This is usefull if a background job is updating the status
* @return array
*/
public function discover(string $remote, string $service, bool $skipCache = false): array {
// Check the cache first
if ($skipCache === false) {
$cacheData = $this->cache->get($remote . '#' . $service);
if ($cacheData) {
$data = json_decode($cacheData, true);
if (\is_array($data)) {
return $data;
}
}
}
$discoveredServices = [];
// query the remote server for available services
try {
$response = $this->client->get($remote . '/ocs-provider/', [
'timeout' => 10,
'connect_timeout' => 10,
]);
if ($response->getStatusCode() === Http::STATUS_OK) {
$decodedServices = json_decode($response->getBody(), true);
if (\is_array($decodedServices)) {
$discoveredServices = $this->getEndpoints($decodedServices, $service);
}
}
} catch (\Exception $e) {
// if we couldn't discover the service or any end-points we return a empty array
}
// Write into cache
$this->cache->set($remote . '#' . $service, json_encode($discoveredServices), 60*60*24);
return $discoveredServices;
}
/**
* get requested end-points from the requested service
*
* @param array $decodedServices
* @param string $service
* @return array
*/
protected function getEndpoints(array $decodedServices, string $service): array {
$discoveredServices = [];
if (isset($decodedServices['services'][$service]['endpoints'])) {
foreach ($decodedServices['services'][$service]['endpoints'] as $endpoint => $url) {
if ($this->isSafeUrl($url)) {
$discoveredServices[$endpoint] = $url;
}
}
}
return $discoveredServices;
}
/**
* Returns whether the specified URL includes only safe characters, if not
* returns false
*
* @param string $url
* @return bool
*/
protected function isSafeUrl(string $url): bool {
return (bool)preg_match('/^[\/\.\-A-Za-z0-9]+$/', $url);
}
}
|
