mirror of
https://github.com/wallabag/wallabag.git
synced 2024-11-24 01:51:01 +00:00
395 lines
No EOL
19 KiB
PHP
395 lines
No EOL
19 KiB
PHP
<?php
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/**
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* poche, a read it later open source system
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*
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* @category poche
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* @author Nicolas Lœuillet <support@inthepoche.com>
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* @copyright 2013
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* @license http://www.wtfpl.net/ see COPYING file
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*/
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class Url
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{
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public $url;
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private $fingerprints = array(
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// Posterous
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'<meta name="generator" content="Posterous"' => array('hostname'=>'fingerprint.posterous.com', 'head'=>true),
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// Blogger
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'<meta content=\'blogger\' name=\'generator\'' => array('hostname'=>'fingerprint.blogspot.com', 'head'=>true),
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'<meta name="generator" content="Blogger"' => array('hostname'=>'fingerprint.blogspot.com', 'head'=>true),
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// WordPress (self-hosted and hosted)
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'<meta name="generator" content="WordPress' => array('hostname'=>'fingerprint.wordpress.com', 'head'=>true)
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);
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private $user_agents = array( 'lifehacker.com' => 'PHP/5.2',
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'gawker.com' => 'PHP/5.2',
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'deadspin.com' => 'PHP/5.2',
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'kotaku.com' => 'PHP/5.2',
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'jezebel.com' => 'PHP/5.2',
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'io9.com' => 'PHP/5.2',
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'jalopnik.com' => 'PHP/5.2',
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'gizmodo.com' => 'PHP/5.2',
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'.wikipedia.org' => 'Mozilla/5.2'
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);
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private $content_type_exc = array(
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'application/pdf' => array('action'=>'link', 'name'=>'PDF'),
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'image' => array('action'=>'link', 'name'=>'Image'),
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'audio' => array('action'=>'link', 'name'=>'Audio'),
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'video' => array('action'=>'link', 'name'=>'Video')
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);
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private $rewrite_url = array(
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// Rewrite public Google Docs URLs to point to HTML view:
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// if a URL contains docs.google.com, replace /Doc? with /View?
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'docs.google.com' => array('/Doc?' => '/View?'),
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'tnr.com' => array('tnr.com/article/' => 'tnr.com/print/article/'),
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'.m.wikipedia.org' => array('.m.wikipedia.org' => '.wikipedia.org')
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);
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private $rewrite_relative_urls = true;
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private $error_message = '[unable to retrieve full-text content]';
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function __construct($url)
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{
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$this->url = base64_decode($url);
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}
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public function getUrl() {
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return $this->url;
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}
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public function setUrl($url) {
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$this->url = $url;
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}
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public function isCorrect() {
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return filter_var($this->url, FILTER_VALIDATE_URL) !== FALSE;
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}
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public function extract() {
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global $http, $extractor;
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$extractor = new ContentExtractor(dirname(__FILE__).'/../3rdparty/site_config/custom', dirname(__FILE__).'/../3rdparty/site_config/standard');
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$extractor->fingerprints = $this->fingerprints;
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$http = new HumbleHttpAgent();
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$http->userAgentMap = $this->user_agents;
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$http->headerOnlyTypes = array_keys($this->content_type_exc);
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$http->rewriteUrls = $this->rewrite_url;
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$http->userAgentDefault = HumbleHttpAgent::UA_PHP;
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// configure SimplePie HTTP extension class to use our HumbleHttpAgent instance
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SimplePie_HumbleHttpAgent::set_agent($http);
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$feed = new SimplePie();
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// some feeds use the text/html content type - force_feed tells SimplePie to process anyway
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$feed->force_feed(true);
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$feed->set_file_class('SimplePie_HumbleHttpAgent');
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$feed->feed_url = $this->url;
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$feed->set_autodiscovery_level(SIMPLEPIE_LOCATOR_NONE);
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$feed->set_timeout(20);
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$feed->enable_cache(false);
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$feed->set_stupidly_fast(true);
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$feed->enable_order_by_date(false); // we don't want to do anything to the feed
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$feed->set_url_replacements(array());
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// initialise the feed
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// the @ suppresses notices which on some servers causes a 500 internal server error
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$result = @$feed->init();
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if ($result && (!is_array($feed->data) || count($feed->data) == 0)) {
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die('Sorry, no feed items found');
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}
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// from now on, we'll identify ourselves as a browser
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$http->userAgentDefault = HumbleHttpAgent::UA_BROWSER;
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unset($feed, $result);
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$feed = new DummySingleItemFeed($this->url);
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$items = $feed->get_items(0, 1);
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// Request all feed items in parallel (if supported)
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$urls_sanitized = array();
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$urls = array();
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foreach ($items as $key => $item) {
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$permalink = htmlspecialchars_decode($item->get_permalink());
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// Colons in URL path segments get encoded by SimplePie, yet some sites expect them unencoded
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$permalink = str_replace('%3A', ':', $permalink);
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if ($permalink) {
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$urls_sanitized[] = $permalink;
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}
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$urls[$key] = $permalink;
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}
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$http->fetchAll($urls_sanitized);
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foreach ($items as $key => $item) {
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$do_content_extraction = true;
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$extract_result = false;
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$permalink = $urls[$key];
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// TODO: Allow error codes - some sites return correct content with error status
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// e.g. prospectmagazine.co.uk returns 403
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if ($permalink && ($response = $http->get($permalink, true)) && ($response['status_code'] < 300 || $response['status_code'] > 400)) {
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$effective_url = $response['effective_url'];
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// check if action defined for returned Content-Type
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$type = null;
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if (preg_match('!^Content-Type:\s*(([-\w]+)/([-\w\+]+))!im', $response['headers'], $match)) {
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// look for full mime type (e.g. image/jpeg) or just type (e.g. image)
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$match[1] = strtolower(trim($match[1]));
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$match[2] = strtolower(trim($match[2]));
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foreach (array($match[1], $match[2]) as $_mime) {
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if (isset($this->content_type_exc[$_mime])) {
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$type = $match[1];
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$_act = $this->content_type_exc[$_mime]['action'];
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$_name = $this->content_type_exc[$_mime]['name'];
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if ($_act == 'exclude') {
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continue 2; // skip this feed item entry
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} elseif ($_act == 'link') {
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if ($match[2] == 'image') {
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$html = "<a href=\"$effective_url\"><img src=\"$effective_url\" alt=\"$_name\" /></a>";
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} else {
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$html = "<a href=\"$effective_url\">Download $_name</a>";
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}
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$title = $_name;
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$do_content_extraction = false;
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break;
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}
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}
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}
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unset($_mime, $_act, $_name, $match);
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}
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if ($do_content_extraction) {
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$html = $response['body'];
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// remove strange things
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$html = str_replace('</[>', '', $html);
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$html = $this->convert_to_utf8($html, $response['headers']);
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// check site config for single page URL - fetch it if found
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if ($single_page_response = $this->getSinglePage($item, $html, $effective_url)) {
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$html = $single_page_response['body'];
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// remove strange things
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$html = str_replace('</[>', '', $html);
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$html = $this->convert_to_utf8($html, $single_page_response['headers']);
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$effective_url = $single_page_response['effective_url'];
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unset($single_page_response);
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}
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$extract_result = $extractor->process($html, $effective_url);
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$readability = $extractor->readability;
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$content_block = ($extract_result) ? $extractor->getContent() : null;
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}
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}
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if ($do_content_extraction) {
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// if we failed to extract content...
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if (!$extract_result) {
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$html = $this->error_message;
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// keep the original item description
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$html .= $item->get_description();
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} else {
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$readability->clean($content_block, 'select');
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if ($this->rewrite_relative_urls) $this->makeAbsolute($effective_url, $content_block);
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if ($content_block->childNodes->length == 1 && $content_block->firstChild->nodeType === XML_ELEMENT_NODE) {
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$html = $content_block->firstChild->innerHTML;
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} else {
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$html = $content_block->innerHTML;
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}
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// post-processing cleanup
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$html = preg_replace('!<p>[\s\h\v]*</p>!u', '', $html);
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}
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}
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}
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$title = ($extractor->getTitle() != '' ? $extractor->getTitle() : _('Untitled'));
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$content = array ('title' => $title, 'body' => $html);
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return $content;
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}
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private function convert_to_utf8($html, $header=null)
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{
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$encoding = null;
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if ($html || $header) {
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if (is_array($header)) $header = implode("\n", $header);
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if (!$header || !preg_match_all('/^Content-Type:\s+([^;]+)(?:;\s*charset=["\']?([^;"\'\n]*))?/im', $header, $match, PREG_SET_ORDER)) {
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// error parsing the response
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} else {
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$match = end($match); // get last matched element (in case of redirects)
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if (isset($match[2])) $encoding = trim($match[2], "\"' \r\n\0\x0B\t");
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}
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// TODO: check to see if encoding is supported (can we convert it?)
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// If it's not, result will be empty string.
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// For now we'll check for invalid encoding types returned by some sites, e.g. 'none'
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// Problem URL: http://facta.co.jp/blog/archives/20111026001026.html
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if (!$encoding || $encoding == 'none') {
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// search for encoding in HTML - only look at the first 35000 characters
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$html_head = substr($html, 0, 40000);
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if (preg_match('/^<\?xml\s+version=(?:"[^"]*"|\'[^\']*\')\s+encoding=("[^"]*"|\'[^\']*\')/s', $html_head, $match)) {
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$encoding = trim($match[1], '"\'');
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} elseif (preg_match('/<meta\s+http-equiv=["\']?Content-Type["\']? content=["\'][^;]+;\s*charset=["\']?([^;"\'>]+)/i', $html_head, $match)) {
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$encoding = trim($match[1]);
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} elseif (preg_match_all('/<meta\s+([^>]+)>/i', $html_head, $match)) {
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foreach ($match[1] as $_test) {
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if (preg_match('/charset=["\']?([^"\']+)/i', $_test, $_m)) {
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$encoding = trim($_m[1]);
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break;
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}
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}
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}
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}
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if (isset($encoding)) $encoding = trim($encoding);
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// trim is important here!
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if (!$encoding || (strtolower($encoding) == 'iso-8859-1')) {
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// replace MS Word smart qutoes
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$trans = array();
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$trans[chr(130)] = '‚'; // Single Low-9 Quotation Mark
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$trans[chr(131)] = 'ƒ'; // Latin Small Letter F With Hook
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$trans[chr(132)] = '„'; // Double Low-9 Quotation Mark
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$trans[chr(133)] = '…'; // Horizontal Ellipsis
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$trans[chr(134)] = '†'; // Dagger
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$trans[chr(135)] = '‡'; // Double Dagger
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$trans[chr(136)] = 'ˆ'; // Modifier Letter Circumflex Accent
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$trans[chr(137)] = '‰'; // Per Mille Sign
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$trans[chr(138)] = 'Š'; // Latin Capital Letter S With Caron
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$trans[chr(139)] = '‹'; // Single Left-Pointing Angle Quotation Mark
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$trans[chr(140)] = 'Œ'; // Latin Capital Ligature OE
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$trans[chr(145)] = '‘'; // Left Single Quotation Mark
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$trans[chr(146)] = '’'; // Right Single Quotation Mark
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$trans[chr(147)] = '“'; // Left Double Quotation Mark
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$trans[chr(148)] = '”'; // Right Double Quotation Mark
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$trans[chr(149)] = '•'; // Bullet
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$trans[chr(150)] = '–'; // En Dash
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$trans[chr(151)] = '—'; // Em Dash
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$trans[chr(152)] = '˜'; // Small Tilde
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$trans[chr(153)] = '™'; // Trade Mark Sign
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$trans[chr(154)] = 'š'; // Latin Small Letter S With Caron
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$trans[chr(155)] = '›'; // Single Right-Pointing Angle Quotation Mark
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$trans[chr(156)] = 'œ'; // Latin Small Ligature OE
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$trans[chr(159)] = 'Ÿ'; // Latin Capital Letter Y With Diaeresis
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$html = strtr($html, $trans);
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}
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if (!$encoding) {
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$encoding = 'utf-8';
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} else {
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if (strtolower($encoding) != 'utf-8') {
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$html = SimplePie_Misc::change_encoding($html, $encoding, 'utf-8');
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/*
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if (function_exists('iconv')) {
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// iconv appears to handle certain character encodings better than mb_convert_encoding
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$html = iconv($encoding, 'utf-8', $html);
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} else {
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$html = mb_convert_encoding($html, 'utf-8', $encoding);
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}
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*/
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}
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}
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}
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return $html;
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}
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private function makeAbsolute($base, $elem) {
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$base = new SimplePie_IRI($base);
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// remove '//' in URL path (used to prevent URLs from resolving properly)
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// TODO: check if this is still the case
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if (isset($base->path)) $base->path = preg_replace('!//+!', '/', $base->path);
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foreach(array('a'=>'href', 'img'=>'src') as $tag => $attr) {
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$elems = $elem->getElementsByTagName($tag);
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for ($i = $elems->length-1; $i >= 0; $i--) {
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$e = $elems->item($i);
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//$e->parentNode->replaceChild($articleContent->ownerDocument->createTextNode($e->textContent), $e);
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$this->makeAbsoluteAttr($base, $e, $attr);
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}
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if (strtolower($elem->tagName) == $tag) $this->makeAbsoluteAttr($base, $elem, $attr);
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}
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}
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private function makeAbsoluteAttr($base, $e, $attr) {
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if ($e->hasAttribute($attr)) {
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// Trim leading and trailing white space. I don't really like this but
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// unfortunately it does appear on some sites. e.g. <img src=" /path/to/image.jpg" />
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$url = trim(str_replace('%20', ' ', $e->getAttribute($attr)));
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$url = str_replace(' ', '%20', $url);
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if (!preg_match('!https?://!i', $url)) {
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if ($absolute = SimplePie_IRI::absolutize($base, $url)) {
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$e->setAttribute($attr, $absolute);
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}
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}
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}
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}
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private function makeAbsoluteStr($base, $url) {
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$base = new SimplePie_IRI($base);
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// remove '//' in URL path (causes URLs not to resolve properly)
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if (isset($base->path)) $base->path = preg_replace('!//+!', '/', $base->path);
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if (preg_match('!^https?://!i', $url)) {
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// already absolute
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return $url;
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} else {
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if ($absolute = SimplePie_IRI::absolutize($base, $url)) {
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return $absolute;
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}
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return false;
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}
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}
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// returns single page response, or false if not found
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private function getSinglePage($item, $html, $url) {
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global $http, $extractor;
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$host = @parse_url($url, PHP_URL_HOST);
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$site_config = SiteConfig::build($host);
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if ($site_config === false) {
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// check for fingerprints
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if (!empty($extractor->fingerprints) && ($_fphost = $extractor->findHostUsingFingerprints($html))) {
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$site_config = SiteConfig::build($_fphost);
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}
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if ($site_config === false) $site_config = new SiteConfig();
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SiteConfig::add_to_cache($host, $site_config);
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return false;
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} else {
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SiteConfig::add_to_cache($host, $site_config);
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}
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$splink = null;
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if (!empty($site_config->single_page_link)) {
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$splink = $site_config->single_page_link;
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} elseif (!empty($site_config->single_page_link_in_feed)) {
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// single page link xpath is targeted at feed
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$splink = $site_config->single_page_link_in_feed;
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// so let's replace HTML with feed item description
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$html = $item->get_description();
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}
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if (isset($splink)) {
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// Build DOM tree from HTML
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$readability = new PocheReadability($html, $url);
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$xpath = new DOMXPath($readability->dom);
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// Loop through single_page_link xpath expressions
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$single_page_url = null;
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foreach ($splink as $pattern) {
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$elems = @$xpath->evaluate($pattern, $readability->dom);
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if (is_string($elems)) {
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$single_page_url = trim($elems);
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break;
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} elseif ($elems instanceof DOMNodeList && $elems->length > 0) {
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foreach ($elems as $item) {
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if ($item instanceof DOMElement && $item->hasAttribute('href')) {
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$single_page_url = $item->getAttribute('href');
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break;
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} elseif ($item instanceof DOMAttr && $item->value) {
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$single_page_url = $item->value;
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break;
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}
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}
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}
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}
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// If we've got URL, resolve against $url
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if (isset($single_page_url) && ($single_page_url = $this->makeAbsoluteStr($url, $single_page_url))) {
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// check it's not what we have already!
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if ($single_page_url != $url) {
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// it's not, so let's try to fetch it...
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$_prev_ref = $http->referer;
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$http->referer = $single_page_url;
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if (($response = $http->get($single_page_url, true)) && $response['status_code'] < 300) {
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$http->referer = $_prev_ref;
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return $response;
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}
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$http->referer = $_prev_ref;
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}
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}
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}
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return false;
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}
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} |