1: <?php
  2: /**
  3:  * SimplePie
  4:  *
  5:  * A PHP-Based RSS and Atom Feed Framework.
  6:  * Takes the hard work out of managing a complete RSS/Atom solution.
  7:  *
  8:  * Copyright (c) 2004-2012, Ryan Parman, Geoffrey Sneddon, Ryan McCue, and contributors
  9:  * All rights reserved.
 10:  *
 11:  * Redistribution and use in source and binary forms, with or without modification, are
 12:  * permitted provided that the following conditions are met:
 13:  *
 14:  *  * Redistributions of source code must retain the above copyright notice, this list of
 15:  *    conditions and the following disclaimer.
 16:  *
 17:  *  * Redistributions in binary form must reproduce the above copyright notice, this list
 18:  *    of conditions and the following disclaimer in the documentation and/or other materials
 19:  *    provided with the distribution.
 20:  *
 21:  *  * Neither the name of the SimplePie Team nor the names of its contributors may be used
 22:  *    to endorse or promote products derived from this software without specific prior
 23:  *    written permission.
 24:  *
 25:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
 26:  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 27:  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
 28:  * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 29:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 30:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 31:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 32:  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 33:  * POSSIBILITY OF SUCH DAMAGE.
 34:  *
 35:  * @package SimplePie
 36:  * @version 1.3-dev
 37:  * @copyright 2004-2012 Ryan Parman, Geoffrey Sneddon, Ryan McCue
 38:  * @author Ryan Parman
 39:  * @author Geoffrey Sneddon
 40:  * @author Ryan McCue
 41:  * @link http://simplepie.org/ SimplePie
 42:  * @license http://www.opensource.org/licenses/bsd-license.php BSD License
 43:  */
 44: 
 45: /**
 46:  * Used for feed auto-discovery
 47:  *
 48:  *
 49:  * This class can be overloaded with {@see SimplePie::set_locator_class()}
 50:  *
 51:  * @package SimplePie
 52:  */
 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 $registry;
 67: 
 68:     public function __construct(&$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:         $this->dom = new DOMDocument();
 76: 
 77:         set_error_handler(array('SimplePie_Misc', 'silence_errors'));
 78:         $this->dom->loadHTML($this->file->body);
 79:         restore_error_handler();
 80:     }
 81: 
 82:     public function set_registry(SimplePie_Registry &$registry)
 83:     {
 84:         $this->registry = &$registry;
 85:     }
 86: 
 87:     public function find($type = SIMPLEPIE_LOCATOR_ALL, &$working)
 88:     {
 89:         if ($this->is_feed($this->file))
 90:         {
 91:             return $this->file;
 92:         }
 93: 
 94:         if ($this->file->method & SIMPLEPIE_FILE_SOURCE_REMOTE)
 95:         {
 96:             $sniffer = $this->registry->create('Content_Type_Sniffer', array($this->file));
 97:             if ($sniffer->get_type() !== 'text/html')
 98:             {
 99:                 return null;
100:             }
101:         }
102: 
103:         if ($type & ~SIMPLEPIE_LOCATOR_NONE)
104:         {
105:             $this->get_base();
106:         }
107: 
108:         if ($type & SIMPLEPIE_LOCATOR_AUTODISCOVERY && $working = $this->autodiscovery())
109:         {
110:             return $working[0];
111:         }
112: 
113:         if ($type & (SIMPLEPIE_LOCATOR_LOCAL_EXTENSION | SIMPLEPIE_LOCATOR_LOCAL_BODY | SIMPLEPIE_LOCATOR_REMOTE_EXTENSION | SIMPLEPIE_LOCATOR_REMOTE_BODY) && $this->get_links())
114:         {
115:             if ($type & SIMPLEPIE_LOCATOR_LOCAL_EXTENSION && $working = $this->extension($this->local))
116:             {
117:                 return $working;
118:             }
119: 
120:             if ($type & SIMPLEPIE_LOCATOR_LOCAL_BODY && $working = $this->body($this->local))
121:             {
122:                 return $working;
123:             }
124: 
125:             if ($type & SIMPLEPIE_LOCATOR_REMOTE_EXTENSION && $working = $this->extension($this->elsewhere))
126:             {
127:                 return $working;
128:             }
129: 
130:             if ($type & SIMPLEPIE_LOCATOR_REMOTE_BODY && $working = $this->body($this->elsewhere))
131:             {
132:                 return $working;
133:             }
134:         }
135:         return null;
136:     }
137: 
138:     public function is_feed(&$file)
139:     {
140:         if ($file->method & SIMPLEPIE_FILE_SOURCE_REMOTE)
141:         {
142:             $sniffer = $this->registry->create('Content_Type_Sniffer', array($file));
143:             $sniffed = $sniffer->get_type();
144:             if (in_array($sniffed, array('application/rss+xml', 'application/rdf+xml', 'text/rdf', 'application/atom+xml', 'text/xml', 'application/xml')))
145:             {
146:                 return true;
147:             }
148:             else
149:             {
150:                 return false;
151:             }
152:         }
153:         elseif ($file->method & SIMPLEPIE_FILE_SOURCE_LOCAL)
154:         {
155:             return true;
156:         }
157:         else
158:         {
159:             return false;
160:         }
161:     }
162: 
163:     public function get_base()
164:     {
165:         $this->http_base = $this->file->url;
166:         $this->base = $this->http_base;
167:         $elements = $this->dom->getElementsByTagName('base');
168:         foreach ($elements as $element)
169:         {
170:             if ($element->hasAttribute('href'))
171:             {
172:                 $this->base = $this->registry->call('Misc', 'absolutize_url', array(trim($element->getAttribute('href')), $this->http_base));
173:                 $this->base_location = $element->getLineNo();
174:                 break;
175:             }
176:         }
177:     }
178: 
179:     public function autodiscovery()
180:     {
181:         $done = array();
182:         $feeds = array();
183:         $feeds = array_merge($feeds, $this->search_elements_by_tag('link', $done, $feeds));
184:         $feeds = array_merge($feeds, $this->search_elements_by_tag('a', $done, $feeds));
185:         $feeds = array_merge($feeds, $this->search_elements_by_tag('area', $done, $feeds));
186: 
187:         if (!empty($feeds))
188:         {
189:             return array_values($feeds);
190:         }
191:         else
192:         {
193:             return null;
194:         }
195:     }
196: 
197:     protected function search_elements_by_tag($name, &$done, $feeds)
198:     {
199:         $links = $this->dom->getElementsByTagName($name);
200:         foreach ($links as $link)
201:         {
202:             if ($this->checked_feeds === $this->max_checked_feeds)
203:             {
204:                 break;
205:             }
206:             if ($link->hasAttribute('href') && $link->hasAttribute('rel'))
207:             {
208:                 $rel = array_unique($this->registry->call('Misc', 'space_seperated_tokens', array(strtolower($link->getAttribute('rel')))));
209: 
210:                 if ($this->base_location < $link->getLineNo())
211:                 {
212:                     $href = $this->registry->call('Misc', 'absolutize_url', array(trim($link->getAttribute('href')), $this->base));
213:                 }
214:                 else
215:                 {
216:                     $href = $this->registry->call('Misc', 'absolutize_url', array(trim($link->getAttribute('href')), $this->http_base));
217:                 }
218: 
219:                 if (!in_array($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]))
220:                 {
221:                     $this->checked_feeds++;
222:                     $headers = array(
223:                         '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',
224:                     );
225:                     $feed = $this->registry->create('File', array($href, $this->timeout, 5, $headers, $this->useragent));
226:                     if ($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))
227:                     {
228:                         $feeds[$href] = $feed;
229:                     }
230:                 }
231:                 $done[] = $href;
232:             }
233:         }
234: 
235:         return $feeds;
236:     }
237: 
238:     public function get_links()
239:     {
240:         $links = $this->dom->getElementsByTagName('a');
241:         foreach ($links as $link)
242:         {
243:             if ($link->hasAttribute('href'))
244:             {
245:                 $href = trim($link->getAttribute('href'));
246:                 $parsed = $this->registry->call('Misc', 'parse_url', array($href));
247:                 if ($parsed['scheme'] === '' || preg_match('/^(http(s)|feed)?$/i', $parsed['scheme']))
248:                 {
249:                     if ($this->base_location < $link->getLineNo())
250:                     {
251:                         $href = $this->registry->call('Misc', 'absolutize_url', array(trim($link->getAttribute('href')), $this->base));
252:                     }
253:                     else
254:                     {
255:                         $href = $this->registry->call('Misc', 'absolutize_url', array(trim($link->getAttribute('href')), $this->http_base));
256:                     }
257: 
258:                     $current = $this->registry->call('Misc', 'parse_url', array($this->file->url));
259: 
260:                     if ($parsed['authority'] === '' || $parsed['authority'] === $current['authority'])
261:                     {
262:                         $this->local[] = $href;
263:                     }
264:                     else
265:                     {
266:                         $this->elsewhere[] = $href;
267:                     }
268:                 }
269:             }
270:         }
271:         $this->local = array_unique($this->local);
272:         $this->elsewhere = array_unique($this->elsewhere);
273:         if (!empty($this->local) || !empty($this->elsewhere))
274:         {
275:             return true;
276:         }
277:         return null;
278:     }
279: 
280:     public function extension(&$array)
281:     {
282:         foreach ($array as $key => $value)
283:         {
284:             if ($this->checked_feeds === $this->max_checked_feeds)
285:             {
286:                 break;
287:             }
288:             if (in_array(strtolower(strrchr($value, '.')), array('.rss', '.rdf', '.atom', '.xml')))
289:             {
290:                 $this->checked_feeds++;
291: 
292:                 $headers = array(
293:                     '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',
294:                 );
295:                 $feed = $this->registry->create('File', array($value, $this->timeout, 5, $headers, $this->useragent));
296:                 if ($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))
297:                 {
298:                     return $feed;
299:                 }
300:                 else
301:                 {
302:                     unset($array[$key]);
303:                 }
304:             }
305:         }
306:         return null;
307:     }
308: 
309:     public function body(&$array)
310:     {
311:         foreach ($array as $key => $value)
312:         {
313:             if ($this->checked_feeds === $this->max_checked_feeds)
314:             {
315:                 break;
316:             }
317:             if (preg_match('/(rss|rdf|atom|xml)/i', $value))
318:             {
319:                 $this->checked_feeds++;
320:                 $headers = array(
321:                     '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',
322:                 );
323:                 $feed = $this->registry->create('File', array($value, $this->timeout, 5, null, $this->useragent));
324:                 if ($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))
325:                 {
326:                     return $feed;
327:                 }
328:                 else
329:                 {
330:                     unset($array[$key]);
331:                 }
332:             }
333:         }
334:         return null;
335:     }
336: }
337: 
338: