577 lines
20 KiB
PHP
577 lines
20 KiB
PHP
<?php
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// Create Full-Text Feeds
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// Author: Keyvan Minoukadeh
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// Copyright (c) 2010 Keyvan Minoukadeh
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// License: AGPLv3
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// Version: 2.2
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// Date: 2010-10-30
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/*
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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// Usage
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// -----
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// Request this file passing it your feed in the querystring: makefulltextfeed.php?url=mysite.org
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// The following options can be passed in the querystring:
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// * URL: url=[feed or website url] (required, should be URL-encoded - in php: urlencode($url))
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// * URL points to HTML (not feed): html=true (optional, by default it's automatically detected)
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// * API key: key=[api key] (optional, refer to config.php)
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// * Max entries to process: max=[max number of items] (optional)
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error_reporting(E_ALL ^ E_NOTICE);
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ini_set("display_errors", 1);
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@set_time_limit(120);
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// set include path
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set_include_path(realpath(dirname(__FILE__).'/libraries').PATH_SEPARATOR.get_include_path());
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// Autoloading of classes allows us to include files only when they're
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// needed. If we've got a cached copy, for example, only Zend_Cache is loaded.
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function __autoload($class_name) {
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static $mapping = array(
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// Include SimplePie for RSS/Atom parsing
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'SimplePie' => 'simplepie/simplepie.class.php',
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'SimplePie_Misc' => 'simplepie/simplepie.class.php',
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// Include FeedCreator for RSS/Atom creation
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'FeedWriter' => 'feedwriter/FeedWriter.php',
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'FeedItem' => 'feedwriter/FeedItem.php',
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// Include Readability for identifying and extracting content from URLs
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'Readability' => 'readability/Readability.php',
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// Include Humble HTTP Agent to allow parallel requests and response caching
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'HumbleHttpAgent' => 'humble-http-agent/HumbleHttpAgent.php',
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// Include IRI class for resolving relative URLs
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'IRI' => 'iri/iri.php',
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// Include Zend Cache to improve performance (cache results)
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'Zend_Cache' => 'Zend/Cache.php'
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);
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if (isset($mapping[$class_name])) {
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//echo "Loading $class_name\n<br />";
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require_once $mapping[$class_name];
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return true;
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} else {
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return false;
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}
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}
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////////////////////////////////
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// Load config file if it exists
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////////////////////////////////
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// the config values below should be set in config.php (rename config-sample.php if config.php doesn't exist).
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// the values below will only be used if config.php doesn't exist.
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$options->enabled = true;
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$options->restrict = false;
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$options->default_entries = 5;
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$options->max_entries = 10;
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$options->rewrite_relative_urls = true;
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$options->caching = false;
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$options->cache_dir = dirname(__FILE__).'/cache';
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$options->message_to_prepend = '';
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$options->message_to_append = '';
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$options->blocked_urls = array();
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$options->alternative_url = '';
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$options->error_message = '[unable to retrieve full-text content]';
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$options->api_keys = array();
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$options->default_entries_with_key = 5;
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$options->max_entries_with_key = 10;
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$options->message_to_prepend_with_key = '';
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$options->message_to_append_with_key = '';
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$options->error_message_with_key = '[unable to retrieve full-text content]';
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$options->cache_directory_level = 0;
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if (file_exists(dirname(__FILE__).'/config.php')) {
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require_once(dirname(__FILE__).'/config.php');
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}
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//////////////////////////////////////////////
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// Convert $html to UTF8
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// (uses HTTP headers and HTML to find encoding)
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// adapted from http://stackoverflow.com/questions/910793/php-detect-encoding-and-make-everything-utf-8
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//////////////////////////////////////////////
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function convert_to_utf8($html, $header=null)
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{
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$accept = array(
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'type' => array('application/rss+xml', 'application/xml', 'application/rdf+xml', 'text/xml', 'text/html'),
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'charset' => array_diff(mb_list_encodings(), array('pass', 'auto', 'wchar', 'byte2be', 'byte2le', 'byte4be', 'byte4le', 'BASE64', 'UUENCODE', 'HTML-ENTITIES', 'Quoted-Printable', '7bit', '8bit'))
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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($match); // get last matched element (in case of redirects)
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if (!in_array(strtolower($match[1]), $accept['type'])) {
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// type not accepted
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// TODO: avoid conversion
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}
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if (isset($match[2])) $encoding = trim($match[2], '"\'');
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}
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if (!$encoding) {
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if (preg_match('/^<\?xml\s+version=(?:"[^"]*"|\'[^\']*\')\s+encoding=("[^"]*"|\'[^\']*\')/s', $html, $match)) {
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$encoding = trim($match[1], '"\'');
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} elseif(preg_match('/<meta\s+http-equiv=["\']Content-Type["\'] content=["\'][^;]+;\s*charset=["\']?([^;"\'>]+)/i', $html, $match)) {
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if (isset($match[1])) $encoding = trim($match[1]);
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}
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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 (!in_array($encoding, array_map('strtolower', $accept['charset']))) {
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// encoding not accepted
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// TODO: avoid conversion
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}
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if (strtolower($encoding) != 'utf-8') {
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if (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, $trans);
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}
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$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 $html;
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}
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function makeAbsolute($base, $elem) {
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$base = new IRI($base);
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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), $e);
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if ($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', $url)) {
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$absolute = IRI::absolutize($base, $url);
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if ($absolute) {
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$e->setAttribute($attr, $absolute);
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}
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}
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}
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}
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}
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}
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////////////////////////////////
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// Check if service is enabled
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////////////////////////////////
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if (!$options->enabled) {
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die('The full-text RSS service is currently disabled');
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}
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////////////////////////////////
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// Check for feed URL
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////////////////////////////////
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if (!isset($_GET['url'])) {
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die('No URL supplied');
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}
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$url = $_GET['url'];
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if (!preg_match('!^https?://.+!i', $url)) {
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$url = 'http://'.$url;
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}
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$valid_url = filter_var($url, FILTER_VALIDATE_URL);
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if ($valid_url !== false && $valid_url !== null && preg_match('!^https?://!', $valid_url)) {
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$url = filter_var($url, FILTER_SANITIZE_URL);
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} else {
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die('Invalid URL supplied');
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}
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////////////////////////////////
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// Redirect to alternative URL?
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////////////////////////////////
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if ($options->alternative_url != '' && !isset($_GET['redir']) && mt_rand(0, 100) > 50) {
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$redirect = $options->alternative_url.'?redir=true&url='.urlencode($url);
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if (isset($_GET['html'])) $redirect .= '&html='.urlencode($_GET['html']);
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if (isset($_GET['key'])) $redirect .= '&key='.urlencode($_GET['key']);
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if (isset($_GET['max'])) $redirect .= '&max='.(int)$_GET['max'];
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if (isset($_GET['links'])) $redirect .= '&links='.$_GET['links'];
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header("Location: $redirect");
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exit;
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}
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///////////////////////////////////////////////
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// Check if the request is explicitly for an HTML page
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///////////////////////////////////////////////
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$html_only = (isset($_GET['html']) && $_GET['html'] == 'true');
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///////////////////////////////////////////////
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// Check if valid key supplied
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///////////////////////////////////////////////
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$valid_key = (isset($_GET['key']) && in_array($_GET['key'], $options->api_keys));
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///////////////////////////////////////////////
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// Check URL against list of blacklisted URLs
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// TODO: set up better system for this
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///////////////////////////////////////////////
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foreach ($options->blocked_urls as $blockurl) {
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if (strstr($url, $blockurl) !== false) {
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die('URL blocked');
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}
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}
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///////////////////////////////////////////////
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// Max entries
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// see config.php to find these values
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///////////////////////////////////////////////
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if (isset($_GET['max'])) {
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$max = (int)$_GET['max'];
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if ($valid_key) {
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$max = min($max, $options->max_entries_with_key);
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} else {
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$max = min($max, $options->max_entries);
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}
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} else {
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if ($valid_key) {
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$max = $options->default_entries_with_key;
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} else {
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$max = $options->default_entries;
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}
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}
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///////////////////////////////////////////////
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// Link handling
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///////////////////////////////////////////////
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if (($valid_key || !$options->restrict) && isset($_GET['links']) && in_array($_GET['links'], array('preserve', 'footnotes', 'remove'))) {
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$links = $_GET['links'];
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} else {
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$links = 'preserve';
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}
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/////////////////////////////////////
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// Check for valid format
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// (stick to RSS for the time being)
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/////////////////////////////////////
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$format = 'rss';
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//////////////////////////////////
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// Check for cached copy
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//////////////////////////////////
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if ($options->caching) {
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$frontendOptions = array(
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'lifetime' => ($valid_key || !$options->restrict) ? 10*60 : 20*60, // cache lifetime of 10 or 20 minutes
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'automatic_serialization' => false,
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'write_control' => false,
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'automatic_cleaning_factor' => 100,
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'ignore_user_abort' => false
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);
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$backendOptions = array(
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'cache_dir' => ($valid_key) ? $options->cache_dir.'/rss-with-key/' : $options->cache_dir.'/rss/', // directory where to put the cache files
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'file_locking' => false,
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'read_control' => true,
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'read_control_type' => 'strlen',
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'hashed_directory_level' => $options->cache_directory_level,
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'hashed_directory_umask' => 0777,
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'cache_file_umask' => 0664,
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'file_name_prefix' => 'ff'
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);
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// getting a Zend_Cache_Core object
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$cache = Zend_Cache::factory('Core', 'File', $frontendOptions, $backendOptions);
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$cache_id = md5($max.$url.$valid_key.$links);
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if ($data = $cache->load($cache_id)) {
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header("Content-type: text/xml; charset=UTF-8");
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if (headers_sent()) die('Some data has already been output, can\'t send RSS file');
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echo $data;
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exit;
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}
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}
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//////////////////////////////////
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// Set Expires header
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//////////////////////////////////
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if ($valid_key) {
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header('Expires: ' . gmdate('D, d M Y H:i:s', time()+(60*10)) . ' GMT');
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} else {
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header('Expires: ' . gmdate('D, d M Y H:i:s', time()+(60*20)) . ' GMT');
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}
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//////////////////////////////////
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// Set up HTTP agent
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//////////////////////////////////
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$http = new HumbleHttpAgent();
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if ($options->caching) {
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$frontendOptions = array(
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'lifetime' => 30*60, // cache lifetime of 30 minutes
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'automatic_serialization' => true,
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'write_control' => false,
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'automatic_cleaning_factor' => 100,
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'ignore_user_abort' => false
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);
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$backendOptions = array(
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'cache_dir' => $options->cache_dir.'/http-responses/', // directory where to put the cache files
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'file_locking' => false,
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'read_control' => true,
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'read_control_type' => 'strlen',
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'hashed_directory_level' => $options->cache_directory_level,
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'hashed_directory_umask' => 0777,
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'cache_file_umask' => 0664,
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'file_name_prefix' => 'ff'
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);
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$httpCache = Zend_Cache::factory('Core', 'File', $frontendOptions, $backendOptions);
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$http->useCache($httpCache);
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}
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////////////////////////////////
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// Tidy config
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////////////////////////////////
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if (function_exists('tidy_parse_string')) {
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$tidy_config = array(
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'clean' => true,
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'output-xhtml' => true,
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'logical-emphasis' => true,
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'show-body-only' => false,
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'wrap' => 0,
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'drop-empty-paras' => true,
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'drop-proprietary-attributes' => false,
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'enclose-text' => true,
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'enclose-block-text' => true,
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'merge-divs' => true,
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'merge-spans' => true,
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'char-encoding' => 'utf8',
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'hide-comments' => true
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);
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}
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////////////////////////////////
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// Get RSS/Atom feed
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////////////////////////////////
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if (!$html_only) {
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$feed = new SimplePie();
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$feed->set_feed_url($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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//$feed->handle_content_type();
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//$feed->get_title();
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if ($result && (!is_array($feed->data) || count($feed->data) == 0)) {
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die('Sorry, no feed items found');
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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// Extract content from HTML (if URL is not feed or explicit HTML request has been made)
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////////////////////////////////////////////////////////////////////////////////
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if ($html_only || !$result) {
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unset($feed, $result);
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if ($response = $http->get($url)) {
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$effective_url = $response['effective_url'];
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$html = $response['body'];
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$html = convert_to_utf8($html, $response['headers']);
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} else {
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die('Error retrieving '.$url);
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}
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// Run through Tidy (if it exists).
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// This fixes problems with some sites which would otherwise
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// trouble DOMDocument's HTML parsing.
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if (function_exists('tidy_parse_string')) {
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$tidy = tidy_parse_string($html, $tidy_config, 'UTF8');
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if (tidy_clean_repair($tidy)) {
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$html = $tidy->value;
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}
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}
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$readability = new Readability($html, $effective_url);
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if ($links == 'footnotes') $readability->convertLinksToFootnotes = true;
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$readability->init();
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$readability->clean($readability->getContent(), 'select');
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if ($options->rewrite_relative_urls) makeAbsolute($effective_url, $readability->getContent());
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$title = $readability->getTitle()->textContent;
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$content = $readability->getContent()->innerHTML;
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if ($links == 'remove') {
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$content = preg_replace('!</?a[^>]*>!', '', $content);
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}
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if (!$valid_key) {
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$content = $options->message_to_prepend.$content;
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$content .= $options->message_to_append;
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} else {
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$content = $options->message_to_prepend_with_key.$content;
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$content .= $options->message_to_append_with_key;
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}
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unset($readability, $html);
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$output = new FeedWriter(); //ATOM an option
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$output->setTitle($title);
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$output->setDescription("Content extracted from $url");
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if ($format == 'atom') {
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$output->setChannelElement('updated', date(DATE_ATOM));
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$output->setChannelElement('author', array('name'=>'Five Filters', 'uri'=>'http://fivefilters.org'));
|
|
}
|
|
$output->setLink($url);
|
|
$newitem = $output->createNewItem();
|
|
$newitem->setTitle($title);
|
|
$newitem->setLink($url);
|
|
if ($format == 'atom') {
|
|
$newitem->setDate(time());
|
|
$newitem->addElement('content', $content);
|
|
} else {
|
|
$newitem->setDescription($content);
|
|
}
|
|
$output->addItem($newitem);
|
|
$output->genarateFeed();
|
|
exit;
|
|
}
|
|
|
|
////////////////////////////////////////////
|
|
// Create full-text feed
|
|
////////////////////////////////////////////
|
|
$output = new FeedWriter();
|
|
$output->setTitle($feed->get_title());
|
|
$output->setDescription($feed->get_description());
|
|
$output->setLink($feed->get_link());
|
|
if ($img_url = $feed->get_image_url()) {
|
|
$output->setImage($feed->get_title(), $feed->get_link(), $img_url);
|
|
}
|
|
if ($format == 'atom') {
|
|
$output->setChannelElement('updated', date(DATE_ATOM));
|
|
$output->setChannelElement('author', array('name'=>'Five Filters', 'uri'=>'http://fivefilters.org'));
|
|
}
|
|
|
|
////////////////////////////////////////////
|
|
// Loop through feed items
|
|
////////////////////////////////////////////
|
|
$items = $feed->get_items(0, $max);
|
|
// Request all feed items in parallel (if supported)
|
|
$urls_sanitized = array();
|
|
$urls = array();
|
|
foreach ($items as $key => $item) {
|
|
$permalink = htmlspecialchars_decode($item->get_permalink());
|
|
$permalink = $http->validateUrl($permalink);
|
|
if ($permalink) {
|
|
$urls_sanitized[] = $permalink;
|
|
}
|
|
$urls[$key] = $permalink;
|
|
}
|
|
$http->fetchAll($urls_sanitized);
|
|
$http->cacheAll();
|
|
|
|
foreach ($items as $key => $item) {
|
|
$permalink = $urls[$key];
|
|
$newitem = $output->createNewItem();
|
|
$newitem->setTitle(htmlspecialchars_decode($item->get_title()));
|
|
if ($permalink !== false) {
|
|
$newitem->setLink($permalink);
|
|
} else {
|
|
$newitem->setLink($item->get_permalink());
|
|
}
|
|
if ($permalink && $response = $http->get($permalink)) {
|
|
$effective_url = $response['effective_url'];
|
|
$html = $response['body'];
|
|
$html = convert_to_utf8($html, $response['headers']);
|
|
// Run through Tidy (if it exists).
|
|
// This fixes problems with some sites which would otherwise
|
|
// trouble DOMDocument's HTML parsing. (Although sometimes it fails
|
|
// to return anything, so it's a bit of tradeoff.)
|
|
if (function_exists('tidy_parse_string')) {
|
|
$tidy = tidy_parse_string($html, $tidy_config, 'UTF8');
|
|
$tidy->cleanRepair();
|
|
$html = $tidy->value;
|
|
}
|
|
$readability = new Readability($html, $effective_url);
|
|
if ($links == 'footnotes') $readability->convertLinksToFootnotes = true;
|
|
$readability->init();
|
|
$readability->clean($readability->getContent(), 'select');
|
|
if ($options->rewrite_relative_urls) makeAbsolute($effective_url, $readability->getContent());
|
|
$html = $readability->getContent()->innerHTML;
|
|
if ($links == 'remove') {
|
|
$html = preg_replace('!</?a[^>]*>!', '', $html);
|
|
}
|
|
if (!$valid_key) {
|
|
$html = $options->message_to_prepend.$html;
|
|
$html .= $options->message_to_append;
|
|
} else {
|
|
$html = $options->message_to_prepend_with_key.$html;
|
|
$html .= $options->message_to_append_with_key;
|
|
}
|
|
} else {
|
|
if (!$valid_key) {
|
|
$html = $options->error_message;
|
|
} else {
|
|
$html = $options->error_message_with_key;
|
|
}
|
|
$html .= $item->get_description();
|
|
}
|
|
if ($format == 'atom') {
|
|
$newitem->addElement('content', $html);
|
|
$newitem->setDate((int)$item->get_date('U'));
|
|
if ($author = $item->get_author()) {
|
|
$newitem->addElement('author', array('name'=>$author->get_name()));
|
|
}
|
|
} else {
|
|
$newitem->addElement('guid', $item->get_permalink(), array('isPermaLink'=>'true'));
|
|
$newitem->setDescription($html);
|
|
if ((int)$item->get_date('U') > 0) {
|
|
$newitem->setDate((int)$item->get_date('U'));
|
|
}
|
|
if ($author = $item->get_author()) {
|
|
$newitem->addElement('dc:creator', $author->get_name());
|
|
}
|
|
}
|
|
$output->addItem($newitem);
|
|
unset($html);
|
|
}
|
|
// output feed
|
|
if ($options->caching) {
|
|
ob_start();
|
|
$output->genarateFeed();
|
|
$output = ob_get_contents();
|
|
ob_end_clean();
|
|
$cache->save($output, $cache_id);
|
|
echo $output;
|
|
} else {
|
|
$output->genarateFeed();
|
|
}
|
|
?>
|