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1 | <?php | |
2 | /** | |
3 | * poche, a read it later open source system | |
4 | * | |
5 | * @category poche | |
6 | * @author Nicolas LÅ“uillet <support@inthepoche.com> | |
7 | * @copyright 2013 | |
8 | * @license http://www.wtfpl.net/ see COPYING file | |
9 | */ | |
10 | ||
11 | class Url | |
12 | { | |
13 | public $url; | |
14 | ||
15 | private $fingerprints = array( | |
16 | // Posterous | |
17 | '<meta name="generator" content="Posterous"' => array('hostname'=>'fingerprint.posterous.com', 'head'=>true), | |
18 | // Blogger | |
19 | '<meta content=\'blogger\' name=\'generator\'' => array('hostname'=>'fingerprint.blogspot.com', 'head'=>true), | |
20 | '<meta name="generator" content="Blogger"' => array('hostname'=>'fingerprint.blogspot.com', 'head'=>true), | |
21 | // WordPress (self-hosted and hosted) | |
22 | '<meta name="generator" content="WordPress' => array('hostname'=>'fingerprint.wordpress.com', 'head'=>true) | |
23 | ); | |
24 | ||
25 | private $user_agents = array( 'lifehacker.com' => 'PHP/5.2', | |
26 | 'gawker.com' => 'PHP/5.2', | |
27 | 'deadspin.com' => 'PHP/5.2', | |
28 | 'kotaku.com' => 'PHP/5.2', | |
29 | 'jezebel.com' => 'PHP/5.2', | |
30 | 'io9.com' => 'PHP/5.2', | |
31 | 'jalopnik.com' => 'PHP/5.2', | |
32 | 'gizmodo.com' => 'PHP/5.2', | |
33 | '.wikipedia.org' => 'Mozilla/5.2' | |
34 | ); | |
35 | ||
36 | private $content_type_exc = array( | |
37 | 'application/pdf' => array('action'=>'link', 'name'=>'PDF'), | |
38 | 'image' => array('action'=>'link', 'name'=>'Image'), | |
39 | 'audio' => array('action'=>'link', 'name'=>'Audio'), | |
40 | 'video' => array('action'=>'link', 'name'=>'Video') | |
41 | ); | |
42 | ||
43 | private $rewrite_url = array( | |
44 | // Rewrite public Google Docs URLs to point to HTML view: | |
45 | // if a URL contains docs.google.com, replace /Doc? with /View? | |
46 | 'docs.google.com' => array('/Doc?' => '/View?'), | |
47 | 'tnr.com' => array('tnr.com/article/' => 'tnr.com/print/article/'), | |
48 | '.m.wikipedia.org' => array('.m.wikipedia.org' => '.wikipedia.org') | |
49 | ); | |
50 | ||
51 | private $rewrite_relative_urls = true; | |
52 | private $error_message = '[unable to retrieve full-text content]'; | |
53 | ||
54 | function __construct($url) | |
55 | { | |
56 | $this->url = base64_decode($url); | |
57 | } | |
58 | ||
59 | public function getUrl() { | |
60 | return $this->url; | |
61 | } | |
62 | ||
63 | public function setUrl($url) { | |
64 | $this->url = $url; | |
65 | } | |
66 | ||
67 | public function isCorrect() { | |
68 | return filter_var($this->url, FILTER_VALIDATE_URL) !== FALSE; | |
69 | } | |
70 | ||
71 | public function extract() { | |
72 | global $http, $extractor; | |
73 | $extractor = new ContentExtractor(dirname(__FILE__).'/../3rdparty/site_config/custom', dirname(__FILE__).'/../3rdparty/site_config/standard'); | |
74 | $extractor->fingerprints = $this->fingerprints; | |
75 | ||
76 | $http = new HumbleHttpAgent(); | |
77 | $http->userAgentMap = $this->user_agents; | |
78 | $http->headerOnlyTypes = array_keys($this->content_type_exc); | |
79 | $http->rewriteUrls = $this->rewrite_url; | |
80 | $http->userAgentDefault = HumbleHttpAgent::UA_PHP; | |
81 | // configure SimplePie HTTP extension class to use our HumbleHttpAgent instance | |
82 | SimplePie_HumbleHttpAgent::set_agent($http); | |
83 | $feed = new SimplePie(); | |
84 | // some feeds use the text/html content type - force_feed tells SimplePie to process anyway | |
85 | $feed->force_feed(true); | |
86 | $feed->set_file_class('SimplePie_HumbleHttpAgent'); | |
87 | $feed->feed_url = $this->url; | |
88 | $feed->set_autodiscovery_level(SIMPLEPIE_LOCATOR_NONE); | |
89 | $feed->set_timeout(20); | |
90 | $feed->enable_cache(false); | |
91 | $feed->set_stupidly_fast(true); | |
92 | $feed->enable_order_by_date(false); // we don't want to do anything to the feed | |
93 | $feed->set_url_replacements(array()); | |
94 | // initialise the feed | |
95 | // the @ suppresses notices which on some servers causes a 500 internal server error | |
96 | $result = @$feed->init(); | |
97 | if ($result && (!is_array($feed->data) || count($feed->data) == 0)) { | |
98 | die('Sorry, no feed items found'); | |
99 | } | |
100 | // from now on, we'll identify ourselves as a browser | |
101 | $http->userAgentDefault = HumbleHttpAgent::UA_BROWSER; | |
102 | unset($feed, $result); | |
103 | ||
104 | $feed = new DummySingleItemFeed($this->url); | |
105 | ||
106 | $items = $feed->get_items(0, 1); | |
107 | // Request all feed items in parallel (if supported) | |
108 | $urls_sanitized = array(); | |
109 | $urls = array(); | |
110 | foreach ($items as $key => $item) { | |
111 | $permalink = htmlspecialchars_decode($item->get_permalink()); | |
112 | // Colons in URL path segments get encoded by SimplePie, yet some sites expect them unencoded | |
113 | $permalink = str_replace('%3A', ':', $permalink); | |
114 | if ($permalink) { | |
115 | $urls_sanitized[] = $permalink; | |
116 | } | |
117 | $urls[$key] = $permalink; | |
118 | } | |
119 | $http->fetchAll($urls_sanitized); | |
120 | ||
121 | foreach ($items as $key => $item) { | |
122 | $do_content_extraction = true; | |
123 | $extract_result = false; | |
124 | $permalink = $urls[$key]; | |
125 | ||
126 | // TODO: Allow error codes - some sites return correct content with error status | |
127 | // e.g. prospectmagazine.co.uk returns 403 | |
128 | ||
129 | if ($permalink && ($response = $http->get($permalink, true)) && ($response['status_code'] < 300 || $response['status_code'] > 400)) { | |
130 | $effective_url = $response['effective_url']; | |
131 | // check if action defined for returned Content-Type | |
132 | $type = null; | |
133 | if (preg_match('!^Content-Type:\s*(([-\w]+)/([-\w\+]+))!im', $response['headers'], $match)) { | |
134 | // look for full mime type (e.g. image/jpeg) or just type (e.g. image) | |
135 | $match[1] = strtolower(trim($match[1])); | |
136 | $match[2] = strtolower(trim($match[2])); | |
137 | foreach (array($match[1], $match[2]) as $_mime) { | |
138 | if (isset($this->content_type_exc[$_mime])) { | |
139 | $type = $match[1]; | |
140 | $_act = $this->content_type_exc[$_mime]['action']; | |
141 | $_name = $this->content_type_exc[$_mime]['name']; | |
142 | if ($_act == 'exclude') { | |
143 | continue 2; // skip this feed item entry | |
144 | } elseif ($_act == 'link') { | |
145 | if ($match[2] == 'image') { | |
146 | $html = "<a href=\"$effective_url\"><img src=\"$effective_url\" alt=\"$_name\" /></a>"; | |
147 | } else { | |
148 | $html = "<a href=\"$effective_url\">Download $_name</a>"; | |
149 | } | |
150 | $title = $_name; | |
151 | $do_content_extraction = false; | |
152 | break; | |
153 | } | |
154 | } | |
155 | } | |
156 | unset($_mime, $_act, $_name, $match); | |
157 | } | |
158 | if ($do_content_extraction) { | |
159 | $html = $response['body']; | |
160 | // remove strange things | |
161 | $html = str_replace('</[>', '', $html); | |
162 | $html = $this->convert_to_utf8($html, $response['headers']); | |
163 | ||
164 | // check site config for single page URL - fetch it if found | |
165 | if ($single_page_response = $this->getSinglePage($item, $html, $effective_url)) { | |
166 | $html = $single_page_response['body']; | |
167 | // remove strange things | |
168 | $html = str_replace('</[>', '', $html); | |
169 | $html = $this->convert_to_utf8($html, $single_page_response['headers']); | |
170 | $effective_url = $single_page_response['effective_url']; | |
171 | unset($single_page_response); | |
172 | } | |
173 | $extract_result = $extractor->process($html, $effective_url); | |
174 | $readability = $extractor->readability; | |
175 | $content_block = ($extract_result) ? $extractor->getContent() : null; | |
176 | } | |
177 | } | |
178 | if ($do_content_extraction) { | |
179 | // if we failed to extract content... | |
180 | if (!$extract_result) { | |
181 | $html = $this->error_message; | |
182 | // keep the original item description | |
183 | $html .= $item->get_description(); | |
184 | } else { | |
185 | $readability->clean($content_block, 'select'); | |
186 | if ($this->rewrite_relative_urls) $this->makeAbsolute($effective_url, $content_block); | |
187 | if ($content_block->childNodes->length == 1 && $content_block->firstChild->nodeType === XML_ELEMENT_NODE) { | |
188 | $html = $content_block->firstChild->innerHTML; | |
189 | } else { | |
190 | $html = $content_block->innerHTML; | |
191 | } | |
192 | // post-processing cleanup | |
193 | $html = preg_replace('!<p>[\s\h\v]*</p>!u', '', $html); | |
194 | } | |
195 | } | |
196 | } | |
197 | ||
198 | $title = ($extractor->getTitle() != '' ? $extractor->getTitle() : _('Untitled')); | |
199 | $content = array ('title' => $title, 'body' => $html); | |
200 | ||
201 | return $content; | |
202 | } | |
203 | ||
204 | private function convert_to_utf8($html, $header=null) | |
205 | { | |
206 | $encoding = null; | |
207 | if ($html || $header) { | |
208 | if (is_array($header)) $header = implode("\n", $header); | |
209 | if (!$header || !preg_match_all('/^Content-Type:\s+([^;]+)(?:;\s*charset=["\']?([^;"\'\n]*))?/im', $header, $match, PREG_SET_ORDER)) { | |
210 | // error parsing the response | |
211 | } else { | |
212 | $match = end($match); // get last matched element (in case of redirects) | |
213 | if (isset($match[2])) $encoding = trim($match[2], "\"' \r\n\0\x0B\t"); | |
214 | } | |
215 | // TODO: check to see if encoding is supported (can we convert it?) | |
216 | // If it's not, result will be empty string. | |
217 | // For now we'll check for invalid encoding types returned by some sites, e.g. 'none' | |
218 | // Problem URL: http://facta.co.jp/blog/archives/20111026001026.html | |
219 | if (!$encoding || $encoding == 'none') { | |
220 | // search for encoding in HTML - only look at the first 35000 characters | |
221 | $html_head = substr($html, 0, 40000); | |
222 | if (preg_match('/^<\?xml\s+version=(?:"[^"]*"|\'[^\']*\')\s+encoding=("[^"]*"|\'[^\']*\')/s', $html_head, $match)) { | |
223 | $encoding = trim($match[1], '"\''); | |
224 | } elseif (preg_match('/<meta\s+http-equiv=["\']?Content-Type["\']? content=["\'][^;]+;\s*charset=["\']?([^;"\'>]+)/i', $html_head, $match)) { | |
225 | $encoding = trim($match[1]); | |
226 | } elseif (preg_match_all('/<meta\s+([^>]+)>/i', $html_head, $match)) { | |
227 | foreach ($match[1] as $_test) { | |
228 | if (preg_match('/charset=["\']?([^"\']+)/i', $_test, $_m)) { | |
229 | $encoding = trim($_m[1]); | |
230 | break; | |
231 | } | |
232 | } | |
233 | } | |
234 | } | |
235 | if (isset($encoding)) $encoding = trim($encoding); | |
236 | // trim is important here! | |
237 | if (!$encoding || (strtolower($encoding) == 'iso-8859-1')) { | |
238 | // replace MS Word smart qutoes | |
239 | $trans = array(); | |
240 | $trans[chr(130)] = '‚'; // Single Low-9 Quotation Mark | |
241 | $trans[chr(131)] = 'ƒ'; // Latin Small Letter F With Hook | |
242 | $trans[chr(132)] = '„'; // Double Low-9 Quotation Mark | |
243 | $trans[chr(133)] = '…'; // Horizontal Ellipsis | |
244 | $trans[chr(134)] = '†'; // Dagger | |
245 | $trans[chr(135)] = '‡'; // Double Dagger | |
246 | $trans[chr(136)] = 'ˆ'; // Modifier Letter Circumflex Accent | |
247 | $trans[chr(137)] = '‰'; // Per Mille Sign | |
248 | $trans[chr(138)] = 'Š'; // Latin Capital Letter S With Caron | |
249 | $trans[chr(139)] = '‹'; // Single Left-Pointing Angle Quotation Mark | |
250 | $trans[chr(140)] = 'Œ'; // Latin Capital Ligature OE | |
251 | $trans[chr(145)] = '‘'; // Left Single Quotation Mark | |
252 | $trans[chr(146)] = '’'; // Right Single Quotation Mark | |
253 | $trans[chr(147)] = '“'; // Left Double Quotation Mark | |
254 | $trans[chr(148)] = '”'; // Right Double Quotation Mark | |
255 | $trans[chr(149)] = '•'; // Bullet | |
256 | $trans[chr(150)] = '–'; // En Dash | |
257 | $trans[chr(151)] = '—'; // Em Dash | |
258 | $trans[chr(152)] = '˜'; // Small Tilde | |
259 | $trans[chr(153)] = '™'; // Trade Mark Sign | |
260 | $trans[chr(154)] = 'š'; // Latin Small Letter S With Caron | |
261 | $trans[chr(155)] = '›'; // Single Right-Pointing Angle Quotation Mark | |
262 | $trans[chr(156)] = 'œ'; // Latin Small Ligature OE | |
263 | $trans[chr(159)] = 'Ÿ'; // Latin Capital Letter Y With Diaeresis | |
264 | $html = strtr($html, $trans); | |
265 | } | |
266 | if (!$encoding) { | |
267 | $encoding = 'utf-8'; | |
268 | } else { | |
269 | if (strtolower($encoding) != 'utf-8') { | |
270 | $html = SimplePie_Misc::change_encoding($html, $encoding, 'utf-8'); | |
271 | /* | |
272 | if (function_exists('iconv')) { | |
273 | // iconv appears to handle certain character encodings better than mb_convert_encoding | |
274 | $html = iconv($encoding, 'utf-8', $html); | |
275 | } else { | |
276 | $html = mb_convert_encoding($html, 'utf-8', $encoding); | |
277 | } | |
278 | */ | |
279 | } | |
280 | } | |
281 | } | |
282 | return $html; | |
283 | } | |
284 | ||
285 | private function makeAbsolute($base, $elem) { | |
286 | $base = new SimplePie_IRI($base); | |
287 | // remove '//' in URL path (used to prevent URLs from resolving properly) | |
288 | // TODO: check if this is still the case | |
289 | if (isset($base->path)) $base->path = preg_replace('!//+!', '/', $base->path); | |
290 | foreach(array('a'=>'href', 'img'=>'src') as $tag => $attr) { | |
291 | $elems = $elem->getElementsByTagName($tag); | |
292 | for ($i = $elems->length-1; $i >= 0; $i--) { | |
293 | $e = $elems->item($i); | |
294 | //$e->parentNode->replaceChild($articleContent->ownerDocument->createTextNode($e->textContent), $e); | |
295 | $this->makeAbsoluteAttr($base, $e, $attr); | |
296 | } | |
297 | if (strtolower($elem->tagName) == $tag) $this->makeAbsoluteAttr($base, $elem, $attr); | |
298 | } | |
299 | } | |
300 | ||
301 | private function makeAbsoluteAttr($base, $e, $attr) { | |
302 | if ($e->hasAttribute($attr)) { | |
303 | // Trim leading and trailing white space. I don't really like this but | |
304 | // unfortunately it does appear on some sites. e.g. <img src=" /path/to/image.jpg" /> | |
305 | $url = trim(str_replace('%20', ' ', $e->getAttribute($attr))); | |
306 | $url = str_replace(' ', '%20', $url); | |
307 | if (!preg_match('!https?://!i', $url)) { | |
308 | if ($absolute = SimplePie_IRI::absolutize($base, $url)) { | |
309 | $e->setAttribute($attr, $absolute); | |
310 | } | |
311 | } | |
312 | } | |
313 | } | |
314 | ||
315 | private function makeAbsoluteStr($base, $url) { | |
316 | $base = new SimplePie_IRI($base); | |
317 | // remove '//' in URL path (causes URLs not to resolve properly) | |
318 | if (isset($base->path)) $base->path = preg_replace('!//+!', '/', $base->path); | |
319 | if (preg_match('!^https?://!i', $url)) { | |
320 | // already absolute | |
321 | return $url; | |
322 | } else { | |
323 | if ($absolute = SimplePie_IRI::absolutize($base, $url)) { | |
324 | return $absolute; | |
325 | } | |
326 | return false; | |
327 | } | |
328 | } | |
329 | ||
330 | // returns single page response, or false if not found | |
331 | private function getSinglePage($item, $html, $url) { | |
332 | global $http, $extractor; | |
333 | $host = @parse_url($url, PHP_URL_HOST); | |
334 | $site_config = SiteConfig::build($host); | |
335 | if ($site_config === false) { | |
336 | // check for fingerprints | |
337 | if (!empty($extractor->fingerprints) && ($_fphost = $extractor->findHostUsingFingerprints($html))) { | |
338 | $site_config = SiteConfig::build($_fphost); | |
339 | } | |
340 | if ($site_config === false) $site_config = new SiteConfig(); | |
341 | SiteConfig::add_to_cache($host, $site_config); | |
342 | return false; | |
343 | } else { | |
344 | SiteConfig::add_to_cache($host, $site_config); | |
345 | } | |
346 | $splink = null; | |
347 | if (!empty($site_config->single_page_link)) { | |
348 | $splink = $site_config->single_page_link; | |
349 | } elseif (!empty($site_config->single_page_link_in_feed)) { | |
350 | // single page link xpath is targeted at feed | |
351 | $splink = $site_config->single_page_link_in_feed; | |
352 | // so let's replace HTML with feed item description | |
353 | $html = $item->get_description(); | |
354 | } | |
355 | if (isset($splink)) { | |
356 | // Build DOM tree from HTML | |
357 | $readability = new PocheReadability($html, $url); | |
358 | $xpath = new DOMXPath($readability->dom); | |
359 | // Loop through single_page_link xpath expressions | |
360 | $single_page_url = null; | |
361 | foreach ($splink as $pattern) { | |
362 | $elems = @$xpath->evaluate($pattern, $readability->dom); | |
363 | if (is_string($elems)) { | |
364 | $single_page_url = trim($elems); | |
365 | break; | |
366 | } elseif ($elems instanceof DOMNodeList && $elems->length > 0) { | |
367 | foreach ($elems as $item) { | |
368 | if ($item instanceof DOMElement && $item->hasAttribute('href')) { | |
369 | $single_page_url = $item->getAttribute('href'); | |
370 | break; | |
371 | } elseif ($item instanceof DOMAttr && $item->value) { | |
372 | $single_page_url = $item->value; | |
373 | break; | |
374 | } | |
375 | } | |
376 | } | |
377 | } | |
378 | // If we've got URL, resolve against $url | |
379 | if (isset($single_page_url) && ($single_page_url = $this->makeAbsoluteStr($url, $single_page_url))) { | |
380 | // check it's not what we have already! | |
381 | if ($single_page_url != $url) { | |
382 | // it's not, so let's try to fetch it... | |
383 | $_prev_ref = $http->referer; | |
384 | $http->referer = $single_page_url; | |
385 | if (($response = $http->get($single_page_url, true)) && $response['status_code'] < 300) { | |
386 | $http->referer = $_prev_ref; | |
387 | return $response; | |
388 | } | |
389 | $http->referer = $_prev_ref; | |
390 | } | |
391 | } | |
392 | } | |
393 | return false; | |
394 | } | |
395 | } |