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4b842b20 MR |
1 | <?php |
2 | ||
3 | // Autoloading of classes allows us to include files only when they're | |
4 | // needed. If we've got a cached copy, for example, only Zend_Cache is loaded. | |
5 | function autoload($class_name) { | |
6 | static $dir = null; | |
7 | if ($dir === null) $dir = dirname(__FILE__).'/libraries/'; | |
8 | static $mapping = array( | |
9 | // Include FeedCreator for RSS/Atom creation | |
10 | 'FeedWriter' => 'feedwriter/FeedWriter.php', | |
11 | 'FeedItem' => 'feedwriter/FeedItem.php', | |
12 | // Include ContentExtractor and Readability for identifying and extracting content from URLs | |
13 | 'ContentExtractor' => 'content-extractor/ContentExtractor.php', | |
14 | 'SiteConfig' => 'content-extractor/SiteConfig.php', | |
4b842b20 MR |
15 | // Include Humble HTTP Agent to allow parallel requests and response caching |
16 | 'HumbleHttpAgent' => 'humble-http-agent/HumbleHttpAgent.php', | |
17 | 'SimplePie_HumbleHttpAgent' => 'humble-http-agent/SimplePie_HumbleHttpAgent.php', | |
18 | 'CookieJar' => 'humble-http-agent/CookieJar.php', | |
19 | // Include Zend Cache to improve performance (cache results) | |
20 | 'Zend_Cache' => 'Zend/Cache.php', | |
21 | // Language detect | |
22 | 'Text_LanguageDetect' => 'language-detect/LanguageDetect.php', | |
23 | // HTML5 Lib | |
24 | 'HTML5_Parser' => 'html5/Parser.php', | |
25 | // htmLawed - used if XSS filter is enabled (xss_filter) | |
26 | 'htmLawed' => 'htmLawed/htmLawed.php' | |
27 | ); | |
28 | if (isset($mapping[$class_name])) { | |
29 | debug("** Loading class $class_name ({$mapping[$class_name]})"); | |
30 | require $dir.$mapping[$class_name]; | |
31 | return true; | |
32 | } else { | |
33 | return false; | |
34 | } | |
35 | } | |
36 | spl_autoload_register('autoload'); | |
4b842b20 MR |
37 | |
38 | class DummySingleItemFeed { | |
39 | public $item; | |
40 | function __construct($url) { $this->item = new DummySingleItem($url); } | |
41 | public function get_title() { return ''; } | |
42 | public function get_description() { return 'Content extracted from '.$this->item->url; } | |
43 | public function get_link() { return $this->item->url; } | |
44 | public function get_language() { return false; } | |
45 | public function get_image_url() { return false; } | |
46 | public function get_items($start=0, $max=1) { return array(0=>$this->item); } | |
47 | } | |
48 | class DummySingleItem { | |
49 | public $url; | |
50 | function __construct($url) { $this->url = $url; } | |
51 | public function get_permalink() { return $this->url; } | |
52 | public function get_title() { return null; } | |
53 | public function get_date($format='') { return false; } | |
54 | public function get_author($key=0) { return null; } | |
55 | public function get_authors() { return null; } | |
56 | public function get_description() { return ''; } | |
57 | public function get_enclosure($key=0, $prefer=null) { return null; } | |
58 | public function get_enclosures() { return null; } | |
59 | public function get_categories() { return null; } | |
60 | } | |
61 | ||
62 | /////////////////////////////// | |
63 | // HELPER FUNCTIONS | |
64 | /////////////////////////////// | |
65 | ||
820d81aa NL |
66 | // Adapted from WordPress |
67 | // http://core.trac.wordpress.org/browser/tags/3.5.1/wp-includes/formatting.php#L2173 | |
68 | function get_excerpt($text, $num_words=55, $more=null) { | |
69 | if (null === $more) $more = '…'; | |
70 | $text = strip_tags($text); | |
71 | //TODO: Check if word count is based on single characters (East Asian characters) | |
72 | /* | |
73 | if (1==2) { | |
74 | $text = trim(preg_replace("/[\n\r\t ]+/", ' ', $text), ' '); | |
75 | preg_match_all('/./u', $text, $words_array); | |
76 | $words_array = array_slice($words_array[0], 0, $num_words + 1); | |
77 | $sep = ''; | |
78 | } else { | |
79 | $words_array = preg_split("/[\n\r\t ]+/", $text, $num_words + 1, PREG_SPLIT_NO_EMPTY); | |
80 | $sep = ' '; | |
81 | } | |
82 | */ | |
83 | $words_array = preg_split("/[\n\r\t ]+/", $text, $num_words + 1, PREG_SPLIT_NO_EMPTY); | |
84 | $sep = ' '; | |
85 | if (count($words_array) > $num_words) { | |
86 | array_pop($words_array); | |
87 | $text = implode($sep, $words_array); | |
88 | $text = $text.$more; | |
89 | } else { | |
90 | $text = implode($sep, $words_array); | |
91 | } | |
92 | // trim whitespace at beginning or end of string | |
93 | // See: http://stackoverflow.com/questions/4166896/trim-unicode-whitespace-in-php-5-2 | |
94 | $text = preg_replace('/^[\pZ\pC]+|[\pZ\pC]+$/u', '', $text); | |
95 | return $text; | |
96 | } | |
97 | ||
4b842b20 MR |
98 | function url_allowed($url) { |
99 | global $options; | |
100 | if (!empty($options->allowed_urls)) { | |
101 | $allowed = false; | |
102 | foreach ($options->allowed_urls as $allowurl) { | |
103 | if (stristr($url, $allowurl) !== false) { | |
104 | $allowed = true; | |
105 | break; | |
106 | } | |
107 | } | |
108 | if (!$allowed) return false; | |
109 | } else { | |
110 | foreach ($options->blocked_urls as $blockurl) { | |
111 | if (stristr($url, $blockurl) !== false) { | |
112 | return false; | |
113 | } | |
114 | } | |
115 | } | |
116 | return true; | |
117 | } | |
118 | ||
119 | ////////////////////////////////////////////// | |
120 | // Convert $html to UTF8 | |
121 | // (uses HTTP headers and HTML to find encoding) | |
122 | // adapted from http://stackoverflow.com/questions/910793/php-detect-encoding-and-make-everything-utf-8 | |
123 | ////////////////////////////////////////////// | |
124 | function convert_to_utf8($html, $header=null) | |
125 | { | |
126 | $encoding = null; | |
127 | if ($html || $header) { | |
128 | if (is_array($header)) $header = implode("\n", $header); | |
129 | if (!$header || !preg_match_all('/^Content-Type:\s+([^;]+)(?:;\s*charset=["\']?([^;"\'\n]*))?/im', $header, $match, PREG_SET_ORDER)) { | |
130 | // error parsing the response | |
131 | debug('Could not find Content-Type header in HTTP response'); | |
132 | } else { | |
133 | $match = end($match); // get last matched element (in case of redirects) | |
134 | if (isset($match[2])) $encoding = trim($match[2], "\"' \r\n\0\x0B\t"); | |
135 | } | |
136 | // TODO: check to see if encoding is supported (can we convert it?) | |
137 | // If it's not, result will be empty string. | |
138 | // For now we'll check for invalid encoding types returned by some sites, e.g. 'none' | |
139 | // Problem URL: http://facta.co.jp/blog/archives/20111026001026.html | |
140 | if (!$encoding || $encoding == 'none') { | |
141 | // search for encoding in HTML - only look at the first 50000 characters | |
142 | // Why 50000? See, for example, http://www.lemonde.fr/festival-de-cannes/article/2012/05/23/deux-cretes-en-goguette-sur-la-croisette_1705732_766360.html | |
143 | // TODO: improve this so it looks at smaller chunks first | |
144 | $html_head = substr($html, 0, 50000); | |
145 | if (preg_match('/^<\?xml\s+version=(?:"[^"]*"|\'[^\']*\')\s+encoding=("[^"]*"|\'[^\']*\')/s', $html_head, $match)) { | |
146 | $encoding = trim($match[1], '"\''); | |
147 | } elseif (preg_match('/<meta\s+http-equiv=["\']?Content-Type["\']? content=["\'][^;]+;\s*charset=["\']?([^;"\'>]+)/i', $html_head, $match)) { | |
148 | $encoding = trim($match[1]); | |
149 | } elseif (preg_match_all('/<meta\s+([^>]+)>/i', $html_head, $match)) { | |
150 | foreach ($match[1] as $_test) { | |
151 | if (preg_match('/charset=["\']?([^"\']+)/i', $_test, $_m)) { | |
152 | $encoding = trim($_m[1]); | |
153 | break; | |
154 | } | |
155 | } | |
156 | } | |
157 | } | |
158 | if (isset($encoding)) $encoding = trim($encoding); | |
159 | // trim is important here! | |
160 | if (!$encoding || (strtolower($encoding) == 'iso-8859-1')) { | |
161 | // replace MS Word smart qutoes | |
162 | $trans = array(); | |
163 | $trans[chr(130)] = '‚'; // Single Low-9 Quotation Mark | |
164 | $trans[chr(131)] = 'ƒ'; // Latin Small Letter F With Hook | |
165 | $trans[chr(132)] = '„'; // Double Low-9 Quotation Mark | |
166 | $trans[chr(133)] = '…'; // Horizontal Ellipsis | |
167 | $trans[chr(134)] = '†'; // Dagger | |
168 | $trans[chr(135)] = '‡'; // Double Dagger | |
169 | $trans[chr(136)] = 'ˆ'; // Modifier Letter Circumflex Accent | |
170 | $trans[chr(137)] = '‰'; // Per Mille Sign | |
171 | $trans[chr(138)] = 'Š'; // Latin Capital Letter S With Caron | |
172 | $trans[chr(139)] = '‹'; // Single Left-Pointing Angle Quotation Mark | |
173 | $trans[chr(140)] = 'Œ'; // Latin Capital Ligature OE | |
174 | $trans[chr(145)] = '‘'; // Left Single Quotation Mark | |
175 | $trans[chr(146)] = '’'; // Right Single Quotation Mark | |
176 | $trans[chr(147)] = '“'; // Left Double Quotation Mark | |
177 | $trans[chr(148)] = '”'; // Right Double Quotation Mark | |
178 | $trans[chr(149)] = '•'; // Bullet | |
179 | $trans[chr(150)] = '–'; // En Dash | |
180 | $trans[chr(151)] = '—'; // Em Dash | |
181 | $trans[chr(152)] = '˜'; // Small Tilde | |
182 | $trans[chr(153)] = '™'; // Trade Mark Sign | |
183 | $trans[chr(154)] = 'š'; // Latin Small Letter S With Caron | |
184 | $trans[chr(155)] = '›'; // Single Right-Pointing Angle Quotation Mark | |
185 | $trans[chr(156)] = 'œ'; // Latin Small Ligature OE | |
186 | $trans[chr(159)] = 'Ÿ'; // Latin Capital Letter Y With Diaeresis | |
187 | $html = strtr($html, $trans); | |
188 | } | |
189 | if (!$encoding) { | |
190 | debug('No character encoding found, so treating as UTF-8'); | |
191 | $encoding = 'utf-8'; | |
192 | } else { | |
193 | debug('Character encoding: '.$encoding); | |
194 | if (strtolower($encoding) != 'utf-8') { | |
195 | debug('Converting to UTF-8'); | |
196 | $html = SimplePie_Misc::change_encoding($html, $encoding, 'utf-8'); | |
4b842b20 MR |
197 | } |
198 | } | |
199 | } | |
200 | return $html; | |
201 | } | |
202 | ||
203 | function makeAbsolute($base, $elem) { | |
204 | $base = new SimplePie_IRI($base); | |
205 | // remove '//' in URL path (used to prevent URLs from resolving properly) | |
206 | // TODO: check if this is still the case | |
207 | if (isset($base->path)) $base->path = preg_replace('!//+!', '/', $base->path); | |
208 | foreach(array('a'=>'href', 'img'=>'src') as $tag => $attr) { | |
209 | $elems = $elem->getElementsByTagName($tag); | |
210 | for ($i = $elems->length-1; $i >= 0; $i--) { | |
211 | $e = $elems->item($i); | |
212 | //$e->parentNode->replaceChild($articleContent->ownerDocument->createTextNode($e->textContent), $e); | |
213 | makeAbsoluteAttr($base, $e, $attr); | |
214 | } | |
215 | if (strtolower($elem->tagName) == $tag) makeAbsoluteAttr($base, $elem, $attr); | |
216 | } | |
217 | } | |
218 | function makeAbsoluteAttr($base, $e, $attr) { | |
219 | if ($e->hasAttribute($attr)) { | |
3ec62cf9 | 220 | // Trim leading and trailing white space. I don't really like this but |
4b842b20 MR |
221 | // unfortunately it does appear on some sites. e.g. <img src=" /path/to/image.jpg" /> |
222 | $url = trim(str_replace('%20', ' ', $e->getAttribute($attr))); | |
223 | $url = str_replace(' ', '%20', $url); | |
224 | if (!preg_match('!https?://!i', $url)) { | |
225 | if ($absolute = SimplePie_IRI::absolutize($base, $url)) { | |
226 | $e->setAttribute($attr, $absolute); | |
227 | } | |
228 | } | |
229 | } | |
230 | } | |
231 | function makeAbsoluteStr($base, $url) { | |
232 | $base = new SimplePie_IRI($base); | |
233 | // remove '//' in URL path (causes URLs not to resolve properly) | |
234 | if (isset($base->path)) $base->path = preg_replace('!//+!', '/', $base->path); | |
235 | if (preg_match('!^https?://!i', $url)) { | |
236 | // already absolute | |
237 | return $url; | |
238 | } else { | |
239 | if ($absolute = SimplePie_IRI::absolutize($base, $url)) { | |
240 | return $absolute; | |
241 | } | |
242 | return false; | |
243 | } | |
244 | } | |
245 | // returns single page response, or false if not found | |
246 | function getSinglePage($item, $html, $url) { | |
247 | global $http, $extractor; | |
248 | debug('Looking for site config files to see if single page link exists'); | |
249 | $site_config = $extractor->buildSiteConfig($url, $html); | |
250 | $splink = null; | |
251 | if (!empty($site_config->single_page_link)) { | |
252 | $splink = $site_config->single_page_link; | |
253 | } elseif (!empty($site_config->single_page_link_in_feed)) { | |
254 | // single page link xpath is targeted at feed | |
255 | $splink = $site_config->single_page_link_in_feed; | |
256 | // so let's replace HTML with feed item description | |
257 | $html = $item->get_description(); | |
258 | } | |
259 | if (isset($splink)) { | |
260 | // Build DOM tree from HTML | |
261 | $readability = new Readability($html, $url); | |
262 | $xpath = new DOMXPath($readability->dom); | |
263 | // Loop through single_page_link xpath expressions | |
264 | $single_page_url = null; | |
265 | foreach ($splink as $pattern) { | |
266 | $elems = @$xpath->evaluate($pattern, $readability->dom); | |
267 | if (is_string($elems)) { | |
268 | $single_page_url = trim($elems); | |
269 | break; | |
270 | } elseif ($elems instanceof DOMNodeList && $elems->length > 0) { | |
271 | foreach ($elems as $item) { | |
272 | if ($item instanceof DOMElement && $item->hasAttribute('href')) { | |
273 | $single_page_url = $item->getAttribute('href'); | |
274 | break 2; | |
275 | } elseif ($item instanceof DOMAttr && $item->value) { | |
276 | $single_page_url = $item->value; | |
277 | break 2; | |
278 | } | |
279 | } | |
280 | } | |
281 | } | |
282 | // If we've got URL, resolve against $url | |
283 | if (isset($single_page_url) && ($single_page_url = makeAbsoluteStr($url, $single_page_url))) { | |
284 | // check it's not what we have already! | |
285 | if ($single_page_url != $url) { | |
286 | // it's not, so let's try to fetch it... | |
287 | $_prev_ref = $http->referer; | |
288 | $http->referer = $single_page_url; | |
289 | if (($response = $http->get($single_page_url, true)) && $response['status_code'] < 300) { | |
290 | $http->referer = $_prev_ref; | |
291 | return $response; | |
292 | } | |
293 | $http->referer = $_prev_ref; | |
294 | } | |
295 | } | |
296 | } | |
297 | return false; | |
298 | } | |
299 | ||
300 | // based on content-type http header, decide what to do | |
301 | // param: HTTP headers string | |
302 | // return: array with keys: 'mime', 'type', 'subtype', 'action', 'name' | |
303 | // e.g. array('mime'=>'image/jpeg', 'type'=>'image', 'subtype'=>'jpeg', 'action'=>'link', 'name'=>'Image') | |
304 | function get_mime_action_info($headers) { | |
305 | global $options; | |
306 | // check if action defined for returned Content-Type | |
307 | $info = array(); | |
308 | if (preg_match('!^Content-Type:\s*(([-\w]+)/([-\w\+]+))!im', $headers, $match)) { | |
309 | // look for full mime type (e.g. image/jpeg) or just type (e.g. image) | |
310 | // match[1] = full mime type, e.g. image/jpeg | |
311 | // match[2] = first part, e.g. image | |
312 | // match[3] = last part, e.g. jpeg | |
313 | $info['mime'] = strtolower(trim($match[1])); | |
314 | $info['type'] = strtolower(trim($match[2])); | |
315 | $info['subtype'] = strtolower(trim($match[3])); | |
316 | foreach (array($info['mime'], $info['type']) as $_mime) { | |
317 | if (isset($options->content_type_exc[$_mime])) { | |
318 | $info['action'] = $options->content_type_exc[$_mime]['action']; | |
319 | $info['name'] = $options->content_type_exc[$_mime]['name']; | |
320 | break; | |
321 | } | |
322 | } | |
323 | } | |
324 | return $info; | |
325 | } | |
326 | ||
327 | function remove_url_cruft($url) { | |
328 | // remove google analytics for the time being | |
329 | // regex adapted from http://navitronic.co.uk/2010/12/removing-google-analytics-cruft-from-urls/ | |
330 | // https://gist.github.com/758177 | |
331 | return preg_replace('/(\?|\&)utm_[a-z]+=[^\&]+/', '', $url); | |
332 | } | |
333 | ||
334 | function make_substitutions($string) { | |
335 | if ($string == '') return $string; | |
336 | global $item, $effective_url; | |
337 | $string = str_replace('{url}', htmlspecialchars($item->get_permalink()), $string); | |
338 | $string = str_replace('{effective-url}', htmlspecialchars($effective_url), $string); | |
339 | return $string; | |
340 | } | |
341 | ||
342 | function get_cache() { | |
343 | global $options, $valid_key; | |
344 | static $cache = null; | |
345 | if ($cache === null) { | |
346 | $frontendOptions = array( | |
347 | 'lifetime' => 10*60, // cache lifetime of 10 minutes | |
348 | 'automatic_serialization' => false, | |
349 | 'write_control' => false, | |
350 | 'automatic_cleaning_factor' => $options->cache_cleanup, | |
351 | 'ignore_user_abort' => false | |
352 | ); | |
353 | $backendOptions = array( | |
354 | 'cache_dir' => ($valid_key) ? $options->cache_dir.'/rss-with-key/' : $options->cache_dir.'/rss/', // directory where to put the cache files | |
355 | 'file_locking' => false, | |
356 | 'read_control' => true, | |
357 | 'read_control_type' => 'strlen', | |
358 | 'hashed_directory_level' => $options->cache_directory_level, | |
359 | 'hashed_directory_perm' => 0777, | |
360 | 'cache_file_perm' => 0664, | |
361 | 'file_name_prefix' => 'ff' | |
362 | ); | |
363 | // getting a Zend_Cache_Core object | |
364 | $cache = Zend_Cache::factory('Core', 'File', $frontendOptions, $backendOptions); | |
365 | } | |
366 | return $cache; | |
367 | } | |
368 | ||
369 | function debug($msg) { | |
370 | global $debug_mode; | |
371 | if ($debug_mode) { | |
372 | echo '* ',$msg,"\n"; | |
373 | ob_flush(); | |
374 | flush(); | |
375 | } | |
376 | } | |
69242534 | 377 | |
820d81aa NL |
378 | function get_base_url($dom) { |
379 | $xpath = new DOMXPath($dom); | |
380 | $base_url = @$xpath->evaluate('string(//head/base/@href)', $dom); | |
381 | if ($base_url !== '') { | |
382 | return $base_url; | |
383 | } else { | |
384 | return false; | |
385 | } | |
69242534 | 386 | } |