library/SimplePie/Locator.php Quellcode

Locator.php
gehe zur Dokumentation dieser Datei
1 <?php
53 class SimplePie_Locator
54 {
55  var $useragent;
56  var $timeout;
57  var $file;
58  var $local = array();
59  var $elsewhere = array();
60  var $cached_entities = array();
61  var $http_base;
62  var $base;
63  var $base_location = 0;
64  var $checked_feeds = 0;
65  var $max_checked_feeds = 10;
66  protected $registry;
67 
68  public function __construct(SimplePie_File $file, $timeout = 10, $useragent = null, $max_checked_feeds = 10)
69  {
70  $this->file = $file;
71  $this->useragent = $useragent;
72  $this->timeout = $timeout;
73  $this->max_checked_feeds = $max_checked_feeds;
74 
75  if (class_exists('DOMDocument'))
76  {
77  $this->dom = new DOMDocument();
78 
79  set_error_handler(array('SimplePie_Misc', 'silence_errors'));
80  $this->dom->loadHTML($this->file->body);
81  restore_error_handler();
82  }
83  else
84  {
85  $this->dom = null;
86  }
87  }
88 
89  public function set_registry(SimplePie_Registry $registry)
90  {
91  $this->registry = $registry;
92  }
93 
94  public function find($type = SIMPLEPIE_LOCATOR_ALL, &$working)
95  {
96  if ($this->is_feed($this->file))
97  {
98  return $this->file;
99  }
100 
101  if ($this->file->method & SIMPLEPIE_FILE_SOURCE_REMOTE)
102  {
103  $sniffer = $this->registry->create('Content_Type_Sniffer', array($this->file));
104  if ($sniffer->get_type() !== 'text/html')
105  {
106  return null;
107  }
108  }
109 
110  if ($type & ~SIMPLEPIE_LOCATOR_NONE)
111  {
112  $this->get_base();
113  }
114 
115  if ($type & SIMPLEPIE_LOCATOR_AUTODISCOVERY && $working = $this->autodiscovery())
116  {
117  return $working[0];
118  }
119 
120  if ($type & (SIMPLEPIE_LOCATOR_LOCAL_EXTENSION | SIMPLEPIE_LOCATOR_LOCAL_BODY | SIMPLEPIE_LOCATOR_REMOTE_EXTENSION | SIMPLEPIE_LOCATOR_REMOTE_BODY) && $this->get_links())
121  {
122  if ($type & SIMPLEPIE_LOCATOR_LOCAL_EXTENSION && $working = $this->extension($this->local))
123  {
124  return $working;
125  }
126 
127  if ($type & SIMPLEPIE_LOCATOR_LOCAL_BODY && $working = $this->body($this->local))
128  {
129  return $working;
130  }
131 
132  if ($type & SIMPLEPIE_LOCATOR_REMOTE_EXTENSION && $working = $this->extension($this->elsewhere))
133  {
134  return $working;
135  }
136 
137  if ($type & SIMPLEPIE_LOCATOR_REMOTE_BODY && $working = $this->body($this->elsewhere))
138  {
139  return $working;
140  }
141  }
142  return null;
143  }
144 
145  public function is_feed($file)
146  {
147  if ($file->method & SIMPLEPIE_FILE_SOURCE_REMOTE)
148  {
149  $sniffer = $this->registry->create('Content_Type_Sniffer', array($file));
150  $sniffed = $sniffer->get_type();
151  if (in_array($sniffed, array('application/rss+xml', 'application/rdf+xml', 'text/rdf', 'application/atom+xml', 'text/xml', 'application/xml')))
152  {
153  return true;
154  }
155  else
156  {
157  return false;
158  }
159  }
160  elseif ($file->method & SIMPLEPIE_FILE_SOURCE_LOCAL)
161  {
162  return true;
163  }
164  else
165  {
166  return false;
167  }
168  }
169 
170  public function get_base()
171  {
172  if ($this->dom === null)
173  {
174  throw new SimplePie_Exception('DOMDocument not found, unable to use locator');
175  }
176  $this->http_base = $this->file->url;
177  $this->base = $this->http_base;
178  $elements = $this->dom->getElementsByTagName('base');
179  foreach ($elements as $element)
180  {
181  if ($element->hasAttribute('href'))
182  {
183  $base = $this->registry->call('Misc', 'absolutize_url', array(trim($element->getAttribute('href')), $this->http_base));
184  if ($base === false)
185  {
186  continue;
187  }
188  $this->base = $base;
189  $this->base_location = method_exists($element, 'getLineNo') ? $element->getLineNo() : 0;
190  break;
191  }
192  }
193  }
194 
195  public function autodiscovery()
196  {
197  $done = array();
198  $feeds = array();
199  $feeds = array_merge($feeds, $this->search_elements_by_tag('link', $done, $feeds));
200  $feeds = array_merge($feeds, $this->search_elements_by_tag('a', $done, $feeds));
201  $feeds = array_merge($feeds, $this->search_elements_by_tag('area', $done, $feeds));
202 
203  if (!empty($feeds))
204  {
205  return array_values($feeds);
206  }
207  else
208  {
209  return null;
210  }
211  }
212 
213  protected function search_elements_by_tag($name, &$done, $feeds)
214  {
215  if ($this->dom === null)
216  {
217  throw new SimplePie_Exception('DOMDocument not found, unable to use locator');
218  }
219 
220  $links = $this->dom->getElementsByTagName($name);
221  foreach ($links as $link)
222  {
223  if ($this->checked_feeds === $this->max_checked_feeds)
224  {
225  break;
226  }
227  if ($link->hasAttribute('href') && $link->hasAttribute('rel'))
228  {
229  $rel = array_unique($this->registry->call('Misc', 'space_seperated_tokens', array(strtolower($link->getAttribute('rel')))));
230  $line = method_exists($link, 'getLineNo') ? $link->getLineNo() : 1;
231 
232  if ($this->base_location < $line)
233  {
234  $href = $this->registry->call('Misc', 'absolutize_url', array(trim($link->getAttribute('href')), $this->base));
235  }
236  else
237  {
238  $href = $this->registry->call('Misc', 'absolutize_url', array(trim($link->getAttribute('href')), $this->http_base));
239  }
240  if ($href === false)
241  {
242  continue;
243  }
244 
245  if (!in_array($href, $done) && in_array('feed', $rel) || (in_array('alternate', $rel) && !in_array('stylesheet', $rel) && $link->hasAttribute('type') && in_array(strtolower($this->registry->call('Misc', 'parse_mime', array($link->getAttribute('type')))), array('application/rss+xml', 'application/atom+xml'))) && !isset($feeds[$href]))
246  {
247  $this->checked_feeds++;
248  $headers = array(
249  'Accept' => 'application/atom+xml, application/rss+xml, application/rdf+xml;q=0.9, application/xml;q=0.8, text/xml;q=0.8, text/html;q=0.7, unknown/unknown;q=0.1, application/unknown;q=0.1, */*;q=0.1',
250  );
251  $feed = $this->registry->create('File', array($href, $this->timeout, 5, $headers, $this->useragent));
252  if ($feed->success && ($feed->method & SIMPLEPIE_FILE_SOURCE_REMOTE === 0 || ($feed->status_code === 200 || $feed->status_code > 206 && $feed->status_code < 300)) && $this->is_feed($feed))
253  {
254  $feeds[$href] = $feed;
255  }
256  }
257  $done[] = $href;
258  }
259  }
260 
261  return $feeds;
262  }
263 
264  public function get_links()
265  {
266  if ($this->dom === null)
267  {
268  throw new SimplePie_Exception('DOMDocument not found, unable to use locator');
269  }
270 
271  $links = $this->dom->getElementsByTagName('a');
272  foreach ($links as $link)
273  {
274  if ($link->hasAttribute('href'))
275  {
276  $href = trim($link->getAttribute('href'));
277  $parsed = $this->registry->call('Misc', 'parse_url', array($href));
278  if ($parsed['scheme'] === '' || preg_match('/^(http(s)|feed)?$/i', $parsed['scheme']))
279  {
280  if ($this->base_location < $link->getLineNo())
281  {
282  $href = $this->registry->call('Misc', 'absolutize_url', array(trim($link->getAttribute('href')), $this->base));
283  }
284  else
285  {
286  $href = $this->registry->call('Misc', 'absolutize_url', array(trim($link->getAttribute('href')), $this->http_base));
287  }
288  if ($href === false)
289  {
290  continue;
291  }
292 
293  $current = $this->registry->call('Misc', 'parse_url', array($this->file->url));
294 
295  if ($parsed['authority'] === '' || $parsed['authority'] === $current['authority'])
296  {
297  $this->local[] = $href;
298  }
299  else
300  {
301  $this->elsewhere[] = $href;
302  }
303  }
304  }
305  }
306  $this->local = array_unique($this->local);
307  $this->elsewhere = array_unique($this->elsewhere);
308  if (!empty($this->local) || !empty($this->elsewhere))
309  {
310  return true;
311  }
312  return null;
313  }
314 
315  public function extension(&$array)
316  {
317  foreach ($array as $key => $value)
318  {
319  if ($this->checked_feeds === $this->max_checked_feeds)
320  {
321  break;
322  }
323  if (in_array(strtolower(strrchr($value, '.')), array('.rss', '.rdf', '.atom', '.xml')))
324  {
325  $this->checked_feeds++;
326 
327  $headers = array(
328  'Accept' => 'application/atom+xml, application/rss+xml, application/rdf+xml;q=0.9, application/xml;q=0.8, text/xml;q=0.8, text/html;q=0.7, unknown/unknown;q=0.1, application/unknown;q=0.1, */*;q=0.1',
329  );
330  $feed = $this->registry->create('File', array($value, $this->timeout, 5, $headers, $this->useragent));
331  if ($feed->success && ($feed->method & SIMPLEPIE_FILE_SOURCE_REMOTE === 0 || ($feed->status_code === 200 || $feed->status_code > 206 && $feed->status_code < 300)) && $this->is_feed($feed))
332  {
333  return $feed;
334  }
335  else
336  {
337  unset($array[$key]);
338  }
339  }
340  }
341  return null;
342  }
343 
344  public function body(&$array)
345  {
346  foreach ($array as $key => $value)
347  {
348  if ($this->checked_feeds === $this->max_checked_feeds)
349  {
350  break;
351  }
352  if (preg_match('/(rss|rdf|atom|xml)/i', $value))
353  {
354  $this->checked_feeds++;
355  $headers = array(
356  'Accept' => 'application/atom+xml, application/rss+xml, application/rdf+xml;q=0.9, application/xml;q=0.8, text/xml;q=0.8, text/html;q=0.7, unknown/unknown;q=0.1, application/unknown;q=0.1, */*;q=0.1',
357  );
358  $feed = $this->registry->create('File', array($value, $this->timeout, 5, null, $this->useragent));
359  if ($feed->success && ($feed->method & SIMPLEPIE_FILE_SOURCE_REMOTE === 0 || ($feed->status_code === 200 || $feed->status_code > 206 && $feed->status_code < 300)) && $this->is_feed($feed))
360  {
361  return $feed;
362  }
363  else
364  {
365  unset($array[$key]);
366  }
367  }
368  }
369  return null;
370  }
371 }
372 




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