<?php /** * poche, a read it later open source system * * @category poche * @author Nicolas LÅ“uillet <support@inthepoche.com> * @copyright 2013 * @license http://www.wtfpl.net/ see COPYING file */ class Url { public $url; private $fingerprints = array( // Posterous '<meta name="generator" content="Posterous"' => array('hostname'=>'fingerprint.posterous.com', 'head'=>true), // Blogger '<meta content=\'blogger\' name=\'generator\'' => array('hostname'=>'fingerprint.blogspot.com', 'head'=>true), '<meta name="generator" content="Blogger"' => array('hostname'=>'fingerprint.blogspot.com', 'head'=>true), // WordPress (self-hosted and hosted) '<meta name="generator" content="WordPress' => array('hostname'=>'fingerprint.wordpress.com', 'head'=>true) ); private $user_agents = array( 'lifehacker.com' => 'PHP/5.2', 'gawker.com' => 'PHP/5.2', 'deadspin.com' => 'PHP/5.2', 'kotaku.com' => 'PHP/5.2', 'jezebel.com' => 'PHP/5.2', 'io9.com' => 'PHP/5.2', 'jalopnik.com' => 'PHP/5.2', 'gizmodo.com' => 'PHP/5.2', '.wikipedia.org' => 'Mozilla/5.2' ); private $content_type_exc = array( 'application/pdf' => array('action'=>'link', 'name'=>'PDF'), 'image' => array('action'=>'link', 'name'=>'Image'), 'audio' => array('action'=>'link', 'name'=>'Audio'), 'video' => array('action'=>'link', 'name'=>'Video') ); private $rewrite_url = array( // Rewrite public Google Docs URLs to point to HTML view: // if a URL contains docs.google.com, replace /Doc? with /View? 'docs.google.com' => array('/Doc?' => '/View?'), 'tnr.com' => array('tnr.com/article/' => 'tnr.com/print/article/'), '.m.wikipedia.org' => array('.m.wikipedia.org' => '.wikipedia.org') ); private $rewrite_relative_urls = true; private $error_message = '[unable to retrieve full-text content]'; function __construct($url) { $this->url = base64_decode($url); } public function getUrl() { return $this->url; } public function setUrl($url) { $this->url = $url; } public function isCorrect() { return filter_var($this->url, FILTER_VALIDATE_URL) !== FALSE; } public function extract() { global $http, $extractor; $extractor = new ContentExtractor(dirname(__FILE__).'/../3rdparty/site_config/custom', dirname(__FILE__).'/../3rdparty/site_config/standard'); $extractor->fingerprints = $this->fingerprints; $http = new HumbleHttpAgent(); $http->userAgentMap = $this->user_agents; $http->headerOnlyTypes = array_keys($this->content_type_exc); $http->rewriteUrls = $this->rewrite_url; $http->userAgentDefault = HumbleHttpAgent::UA_PHP; // configure SimplePie HTTP extension class to use our HumbleHttpAgent instance SimplePie_HumbleHttpAgent::set_agent($http); $feed = new SimplePie(); // some feeds use the text/html content type - force_feed tells SimplePie to process anyway $feed->force_feed(true); $feed->set_file_class('SimplePie_HumbleHttpAgent'); $feed->feed_url = $this->url; $feed->set_autodiscovery_level(SIMPLEPIE_LOCATOR_NONE); $feed->set_timeout(20); $feed->enable_cache(false); $feed->set_stupidly_fast(true); $feed->enable_order_by_date(false); // we don't want to do anything to the feed $feed->set_url_replacements(array()); // initialise the feed // the @ suppresses notices which on some servers causes a 500 internal server error $result = @$feed->init(); if ($result && (!is_array($feed->data) || count($feed->data) == 0)) { die('Sorry, no feed items found'); } // from now on, we'll identify ourselves as a browser $http->userAgentDefault = HumbleHttpAgent::UA_BROWSER; unset($feed, $result); $feed = new DummySingleItemFeed($this->url); $items = $feed->get_items(0, 1); // Request all feed items in parallel (if supported) $urls_sanitized = array(); $urls = array(); foreach ($items as $key => $item) { $permalink = htmlspecialchars_decode($item->get_permalink()); // Colons in URL path segments get encoded by SimplePie, yet some sites expect them unencoded $permalink = str_replace('%3A', ':', $permalink); if ($permalink) { $urls_sanitized[] = $permalink; } $urls[$key] = $permalink; } $http->fetchAll($urls_sanitized); foreach ($items as $key => $item) { $do_content_extraction = true; $extract_result = false; $permalink = $urls[$key]; // TODO: Allow error codes - some sites return correct content with error status // e.g. prospectmagazine.co.uk returns 403 if ($permalink && ($response = $http->get($permalink, true)) && ($response['status_code'] < 300 || $response['status_code'] > 400)) { $effective_url = $response['effective_url']; // check if action defined for returned Content-Type $type = null; if (preg_match('!^Content-Type:\s*(([-\w]+)/([-\w\+]+))!im', $response['headers'], $match)) { // look for full mime type (e.g. image/jpeg) or just type (e.g. image) $match[1] = strtolower(trim($match[1])); $match[2] = strtolower(trim($match[2])); foreach (array($match[1], $match[2]) as $_mime) { if (isset($this->content_type_exc[$_mime])) { $type = $match[1]; $_act = $this->content_type_exc[$_mime]['action']; $_name = $this->content_type_exc[$_mime]['name']; if ($_act == 'exclude') { continue 2; // skip this feed item entry } elseif ($_act == 'link') { if ($match[2] == 'image') { $html = "<a href=\"$effective_url\"><img src=\"$effective_url\" alt=\"$_name\" /></a>"; } else { $html = "<a href=\"$effective_url\">Download $_name</a>"; } $title = $_name; $do_content_extraction = false; break; } } } unset($_mime, $_act, $_name, $match); } if ($do_content_extraction) { $html = $response['body']; // remove strange things $html = str_replace('</[>', '', $html); $html = $this->convert_to_utf8($html, $response['headers']); // check site config for single page URL - fetch it if found if ($single_page_response = $this->getSinglePage($item, $html, $effective_url)) { $html = $single_page_response['body']; // remove strange things $html = str_replace('</[>', '', $html); $html = $this->convert_to_utf8($html, $single_page_response['headers']); $effective_url = $single_page_response['effective_url']; unset($single_page_response); } $extract_result = $extractor->process($html, $effective_url); $readability = $extractor->readability; $content_block = ($extract_result) ? $extractor->getContent() : null; } } if ($do_content_extraction) { // if we failed to extract content... if (!$extract_result) { $html = $this->error_message; // keep the original item description $html .= $item->get_description(); } else { $readability->clean($content_block, 'select'); if ($this->rewrite_relative_urls) $this->makeAbsolute($effective_url, $content_block); if ($content_block->childNodes->length == 1 && $content_block->firstChild->nodeType === XML_ELEMENT_NODE) { $html = $content_block->firstChild->innerHTML; } else { $html = $content_block->innerHTML; } // post-processing cleanup $html = preg_replace('!<p>[\s\h\v]*</p>!u', '', $html); } } } $title = ($extractor->getTitle() != '' ? $extractor->getTitle() : _('Untitled')); $content = array ('title' => $title, 'body' => $html); return $content; } private function convert_to_utf8($html, $header=null) { $encoding = null; if ($html || $header) { if (is_array($header)) $header = implode("\n", $header); if (!$header || !preg_match_all('/^Content-Type:\s+([^;]+)(?:;\s*charset=["\']?([^;"\'\n]*))?/im', $header, $match, PREG_SET_ORDER)) { // error parsing the response } else { $match = end($match); // get last matched element (in case of redirects) if (isset($match[2])) $encoding = trim($match[2], "\"' \r\n\0\x0B\t"); } // TODO: check to see if encoding is supported (can we convert it?) // If it's not, result will be empty string. // For now we'll check for invalid encoding types returned by some sites, e.g. 'none' // Problem URL: http://facta.co.jp/blog/archives/20111026001026.html if (!$encoding || $encoding == 'none') { // search for encoding in HTML - only look at the first 35000 characters $html_head = substr($html, 0, 40000); if (preg_match('/^<\?xml\s+version=(?:"[^"]*"|\'[^\']*\')\s+encoding=("[^"]*"|\'[^\']*\')/s', $html_head, $match)) { $encoding = trim($match[1], '"\''); } elseif (preg_match('/<meta\s+http-equiv=["\']?Content-Type["\']? content=["\'][^;]+;\s*charset=["\']?([^;"\'>]+)/i', $html_head, $match)) { $encoding = trim($match[1]); } elseif (preg_match_all('/<meta\s+([^>]+)>/i', $html_head, $match)) { foreach ($match[1] as $_test) { if (preg_match('/charset=["\']?([^"\']+)/i', $_test, $_m)) { $encoding = trim($_m[1]); break; } } } } if (isset($encoding)) $encoding = trim($encoding); // trim is important here! if (!$encoding || (strtolower($encoding) == 'iso-8859-1')) { // replace MS Word smart qutoes $trans = array(); $trans[chr(130)] = '‚'; // Single Low-9 Quotation Mark $trans[chr(131)] = 'ƒ'; // Latin Small Letter F With Hook $trans[chr(132)] = '„'; // Double Low-9 Quotation Mark $trans[chr(133)] = '…'; // Horizontal Ellipsis $trans[chr(134)] = '†'; // Dagger $trans[chr(135)] = '‡'; // Double Dagger $trans[chr(136)] = 'ˆ'; // Modifier Letter Circumflex Accent $trans[chr(137)] = '‰'; // Per Mille Sign $trans[chr(138)] = 'Š'; // Latin Capital Letter S With Caron $trans[chr(139)] = '‹'; // Single Left-Pointing Angle Quotation Mark $trans[chr(140)] = 'Œ'; // Latin Capital Ligature OE $trans[chr(145)] = '‘'; // Left Single Quotation Mark $trans[chr(146)] = '’'; // Right Single Quotation Mark $trans[chr(147)] = '“'; // Left Double Quotation Mark $trans[chr(148)] = '”'; // Right Double Quotation Mark $trans[chr(149)] = '•'; // Bullet $trans[chr(150)] = '–'; // En Dash $trans[chr(151)] = '—'; // Em Dash $trans[chr(152)] = '˜'; // Small Tilde $trans[chr(153)] = '™'; // Trade Mark Sign $trans[chr(154)] = 'š'; // Latin Small Letter S With Caron $trans[chr(155)] = '›'; // Single Right-Pointing Angle Quotation Mark $trans[chr(156)] = 'œ'; // Latin Small Ligature OE $trans[chr(159)] = 'Ÿ'; // Latin Capital Letter Y With Diaeresis $html = strtr($html, $trans); } if (!$encoding) { $encoding = 'utf-8'; } else { if (strtolower($encoding) != 'utf-8') { $html = SimplePie_Misc::change_encoding($html, $encoding, 'utf-8'); /* if (function_exists('iconv')) { // iconv appears to handle certain character encodings better than mb_convert_encoding $html = iconv($encoding, 'utf-8', $html); } else { $html = mb_convert_encoding($html, 'utf-8', $encoding); } */ } } } return $html; } private function makeAbsolute($base, $elem) { $base = new SimplePie_IRI($base); // remove '//' in URL path (used to prevent URLs from resolving properly) // TODO: check if this is still the case if (isset($base->path)) $base->path = preg_replace('!//+!', '/', $base->path); foreach(array('a'=>'href', 'img'=>'src') as $tag => $attr) { $elems = $elem->getElementsByTagName($tag); for ($i = $elems->length-1; $i >= 0; $i--) { $e = $elems->item($i); //$e->parentNode->replaceChild($articleContent->ownerDocument->createTextNode($e->textContent), $e); $this->makeAbsoluteAttr($base, $e, $attr); } if (strtolower($elem->tagName) == $tag) $this->makeAbsoluteAttr($base, $elem, $attr); } } private function makeAbsoluteAttr($base, $e, $attr) { if ($e->hasAttribute($attr)) { // Trim leading and trailing white space. I don't really like this but // unfortunately it does appear on some sites. e.g. <img src=" /path/to/image.jpg" /> $url = trim(str_replace('%20', ' ', $e->getAttribute($attr))); $url = str_replace(' ', '%20', $url); if (!preg_match('!https?://!i', $url)) { if ($absolute = SimplePie_IRI::absolutize($base, $url)) { $e->setAttribute($attr, $absolute); } } } } private function makeAbsoluteStr($base, $url) { $base = new SimplePie_IRI($base); // remove '//' in URL path (causes URLs not to resolve properly) if (isset($base->path)) $base->path = preg_replace('!//+!', '/', $base->path); if (preg_match('!^https?://!i', $url)) { // already absolute return $url; } else { if ($absolute = SimplePie_IRI::absolutize($base, $url)) { return $absolute; } return false; } } // returns single page response, or false if not found private function getSinglePage($item, $html, $url) { global $http, $extractor; $host = @parse_url($url, PHP_URL_HOST); $site_config = SiteConfig::build($host); if ($site_config === false) { // check for fingerprints if (!empty($extractor->fingerprints) && ($_fphost = $extractor->findHostUsingFingerprints($html))) { $site_config = SiteConfig::build($_fphost); } if ($site_config === false) $site_config = new SiteConfig(); SiteConfig::add_to_cache($host, $site_config); return false; } else { SiteConfig::add_to_cache($host, $site_config); } $splink = null; if (!empty($site_config->single_page_link)) { $splink = $site_config->single_page_link; } elseif (!empty($site_config->single_page_link_in_feed)) { // single page link xpath is targeted at feed $splink = $site_config->single_page_link_in_feed; // so let's replace HTML with feed item description $html = $item->get_description(); } if (isset($splink)) { // Build DOM tree from HTML $readability = new PocheReadability($html, $url); $xpath = new DOMXPath($readability->dom); // Loop through single_page_link xpath expressions $single_page_url = null; foreach ($splink as $pattern) { $elems = @$xpath->evaluate($pattern, $readability->dom); if (is_string($elems)) { $single_page_url = trim($elems); break; } elseif ($elems instanceof DOMNodeList && $elems->length > 0) { foreach ($elems as $item) { if ($item instanceof DOMElement && $item->hasAttribute('href')) { $single_page_url = $item->getAttribute('href'); break; } elseif ($item instanceof DOMAttr && $item->value) { $single_page_url = $item->value; break; } } } } // If we've got URL, resolve against $url if (isset($single_page_url) && ($single_page_url = $this->makeAbsoluteStr($url, $single_page_url))) { // check it's not what we have already! if ($single_page_url != $url) { // it's not, so let's try to fetch it... $_prev_ref = $http->referer; $http->referer = $single_page_url; if (($response = $http->get($single_page_url, true)) && $response['status_code'] < 300) { $http->referer = $_prev_ref; return $response; } $http->referer = $_prev_ref; } } } return false; } }