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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
<?php
namespace PicoFeed\Reader;
use DOMXPath;
use PicoFeed\Base;
use PicoFeed\Client\Client;
use PicoFeed\Client\Url;
use PicoFeed\Logging\Logger;
use PicoFeed\Parser\XmlParser;
/**
* Reader class.
*
* @author Frederic Guillot
*/
class Reader extends Base
{
/**
* Feed formats for detection.
*
* @var array
*/
private $formats = array(
'Atom' => '//feed',
'Rss20' => '//rss[@version="2.0"]',
'Rss92' => '//rss[@version="0.92"]',
'Rss91' => '//rss[@version="0.91"]',
'Rss10' => '//rdf',
);
/**
* Download a feed (no discovery).
*
* @param string $url Feed url
* @param string $last_modified Last modified HTTP header
* @param string $etag Etag HTTP header
* @param string $username HTTP basic auth username
* @param string $password HTTP basic auth password
*
* @return \PicoFeed\Client\Client
*/
public function download($url, $last_modified = '', $etag = '', $username = '', $password = '')
{
$url = $this->prependScheme($url);
return Client::getInstance()
->setConfig($this->config)
->setLastModified($last_modified)
->setEtag($etag)
->setUsername($username)
->setPassword($password)
->execute($url);
}
/**
* Discover and download a feed.
*
* @param string $url Feed or website url
* @param string $last_modified Last modified HTTP header
* @param string $etag Etag HTTP header
* @param string $username HTTP basic auth username
* @param string $password HTTP basic auth password
*
* @return \PicoFeed\Client\Client
*/
public function discover($url, $last_modified = '', $etag = '', $username = '', $password = '')
{
$client = $this->download($url, $last_modified, $etag, $username, $password);
// It's already a feed or the feed was not modified
if (!$client->isModified() || $this->detectFormat($client->getContent())) {
return $client;
}
// Try to find a subscription
$links = $this->find($client->getUrl(), $client->getContent());
if (empty($links)) {
throw new SubscriptionNotFoundException('Unable to find a subscription');
}
return $this->download($links[0], $last_modified, $etag, $username, $password);
}
/**
* Find feed urls inside a HTML document.
*
* @param string $url Website url
* @param string $html HTML content
*
* @return array List of feed links
*/
public function find($url, $html)
{
Logger::setMessage(get_called_class().': Try to discover subscriptions');
$dom = XmlParser::getHtmlDocument($html);
$xpath = new DOMXPath($dom);
$links = array();
$queries = array(
'//link[@type="application/rss+xml"]',
'//link[@type="application/atom+xml"]',
);
foreach ($queries as $query) {
$nodes = $xpath->query($query);
foreach ($nodes as $node) {
$link = $node->getAttribute('href');
if (!empty($link)) {
$feedUrl = new Url($link);
$siteUrl = new Url($url);
$links[] = $feedUrl->getAbsoluteUrl($feedUrl->isRelativeUrl() ? $siteUrl->getBaseUrl() : '');
}
}
}
Logger::setMessage(get_called_class().': '.implode(', ', $links));
return $links;
}
/**
* Get a parser instance.
*
* @param string $url Site url
* @param string $content Feed content
* @param string $encoding HTTP encoding
*
* @return \PicoFeed\Parser\Parser
*/
public function getParser($url, $content, $encoding)
{
$format = $this->detectFormat($content);
if (empty($format)) {
throw new UnsupportedFeedFormatException('Unable to detect feed format');
}
$className = '\PicoFeed\Parser\\'.$format;
$parser = new $className($content, $encoding, $url);
$parser->setHashAlgo($this->config->getParserHashAlgo());
$parser->setConfig($this->config);
return $parser;
}
/**
* Detect the feed format.
*
* @param string $content Feed content
*
* @return string
*/
public function detectFormat($content)
{
$dom = XmlParser::getHtmlDocument($content);
$xpath = new DOMXPath($dom);
foreach ($this->formats as $parser_name => $query) {
$nodes = $xpath->query($query);
if ($nodes->length === 1) {
return $parser_name;
}
}
return '';
}
/**
* Add the prefix "http://" if the end-user just enter a domain name.
*
* @param string $url Url
* @retunr string
*/
public function prependScheme($url)
{
if (!preg_match('%^https?://%', $url)) {
$url = 'http://'.$url;
}
return $url;
}
}
|
