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Don't accept non-objects before testing with "instanceof".
[quix0rs-gnu-social.git] / plugins / OStatus / lib / discoveryhints.php
1 <?php
2 /*
3  * StatusNet - the distributed open-source microblogging tool
4  * Copyright (C) 2010, StatusNet, Inc.
5  *
6  * Some utilities for generating hint data
7  *
8  * This program is free software: you can redistribute it and/or modify
9  * it under the terms of the GNU Affero General Public License as published by
10  * the Free Software Foundation, either version 3 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU Affero General Public License for more details.
17  *
18  * You should have received a copy of the GNU Affero General Public License
19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
20  */
21
22 class DiscoveryHints {
23     static function fromXRD(XML_XRD $xrd)
24     {
25         $hints = array();
26
27         if (Event::handle('StartDiscoveryHintsFromXRD', array($xrd, &$hints))) {
28             foreach ($xrd->links as $link) {
29                 switch ($link->rel) {
30                 case WebFingerResource_Profile::PROFILEPAGE:
31                     $hints['profileurl'] = $link->href;
32                     break;
33                 case Salmon::REL_SALMON:
34                 case Salmon::NS_MENTIONS:   // XXX: deprecated, remove in the future
35                 case Salmon::NS_REPLIES:    // XXX: deprecated, remove in the future
36                     $hints['salmon'] = $link->href;
37                     break;
38                 case Discovery::UPDATESFROM:
39                     if (empty($link->type) || $link->type == 'application/atom+xml') {
40                         $hints['feedurl'] = $link->href;
41                     }
42                     break;
43                 case Discovery::HCARD:
44                 case Discovery::MF2_HCARD:
45                     $hints['hcard'] = $link->href;
46                     break;
47                 default:
48                     break;
49                 }
50             }
51             Event::handle('EndDiscoveryHintsFromXRD', array($xrd, &$hints));
52         }
53
54         return $hints;
55     }
56
57     static function fromHcardUrl($url)
58     {
59         $client = new HTTPClient();
60         $client->setHeader('Accept', 'text/html,application/xhtml+xml');
61         $response = $client->get($url);
62
63         if (!$response->isOk()) {
64             return null;
65         }
66
67         return self::hcardHints($response->getBody(),
68                                 $response->getUrl());
69     }
70
71     static function hcardHints($body, $url)
72     {
73         $hcard = self::_hcard($body, $url);
74
75         if (empty($hcard)) {
76             return array();
77         }
78
79         $hints = array();
80
81         // XXX: don't copy stuff into an array and then copy it again
82
83         if (array_key_exists('nickname', $hcard) && !empty($hcard['nickname'][0])) {
84             $hints['nickname'] = $hcard['nickname'][0];
85         }
86
87         if (array_key_exists('name', $hcard) && !empty($hcard['name'][0])) {
88             $hints['fullname'] = $hcard['name'][0];
89         }
90
91         if (array_key_exists('photo', $hcard) && count($hcard['photo'])) {
92             $hints['avatar'] = $hcard['photo'][0];
93         }
94
95         if (array_key_exists('note', $hcard) && !empty($hcard['note'][0])) {
96             $hints['bio'] = $hcard['note'][0];
97         }
98
99         if (array_key_exists('adr', $hcard) && !empty($hcard['adr'][0])) {
100             $hints['location'] = $hcard['adr'][0]['value'];
101         }
102
103         if (array_key_exists('url', $hcard) && !empty($hcard['url'][0])) {
104             $hints['homepage'] = $hcard['url'][0];
105         }
106
107         return $hints;
108     }
109
110     static function _hcard($body, $url)
111     {
112         $mf2 = new Mf2\Parser($body, $url);
113         $mf2 = $mf2->parse();
114         
115         if (empty($mf2['items'])) {
116             return null;
117         }
118
119         $hcards = array();
120
121         foreach ($mf2['items'] as $item) {
122             if (!in_array('h-card', $item['type'])) {
123                 continue;
124             }
125
126             // We found a match, return it immediately
127             if (isset($item['properties']['url']) && in_array($url, $item['properties']['url'])) {
128                 return $item['properties'];
129             }
130
131             // Let's keep all the hcards for later, to return one of them at least
132             $hcards[] = $item['properties'];
133         }
134
135         // No match immediately for the url we expected, but there were h-cards found
136         if (count($hcards) > 0) {
137             return $hcards[0];
138         }
139
140         return null;
141     }
142 }