inc/3rdparty/makefulltextfeed.php

   1 <?php
   2 // Full-Text RSS: Create Full-Text Feeds
   3 // Author: Keyvan Minoukadeh
   4 // Copyright (c) 2013 Keyvan Minoukadeh
   5 // License: AGPLv3
   6 // Version: 3.1
   7 // Date: 2013-03-05
   8 // More info: http://fivefilters.org/content-only/
   9 // Help: http://help.fivefilters.org
  10
  11 /*
  12 This program is free software: you can redistribute it and/or modify
  13 it under the terms of the GNU Affero General Public License as published by
  14 the Free Software Foundation, either version 3 of the License, or
  15 (at your option) any later version.
  16
  17 This program is distributed in the hope that it will be useful,
  18 but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 GNU Affero General Public License for more details.
  21
  22 You should have received a copy of the GNU Affero General Public License
  23 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24 */
  25
  26 // Usage
  27 // -----
  28 // Request this file passing it your feed in the querystring: makefulltextfeed.php?url=mysite.org
  29 // The following options can be passed in the querystring:
  30 // * URL: url=[feed or website url] (required, should be URL-encoded - in php: urlencode($url))
  31 // * URL points to HTML (not feed): html=true (optional, by default it's automatically detected)
  32 // * API key: key=[api key] (optional, refer to config.php)
  33 // * Max entries to process: max=[max number of items] (optional)
  34
  35 error_reporting(E_ALL ^ E_NOTICE);
  36 ini_set("display_errors", 1);
  37 @set_time_limit(120);
  38
  39 // Deal with magic quotes
  40 if (get_magic_quotes_gpc()) {
  41         $process = array(&$_GET, &$_POST, &$_REQUEST);
  42         while (list($key, $val) = each($process)) {
  43                 foreach ($val as $k => $v) {
  44                         unset($process[$key][$k]);
  45                         if (is_array($v)) {
  46                                 $process[$key][stripslashes($k)] = $v;
  47                                 $process[] = &$process[$key][stripslashes($k)];
  48                         } else {
  49                                 $process[$key][stripslashes($k)] = stripslashes($v);
  50                         }
  51                 }
  52         }
  53         unset($process);
  54 }
  55
  56 // set include path
  57 set_include_path(realpath(dirname(__FILE__).'/libraries').PATH_SEPARATOR.get_include_path());
  58 // Autoloading of classes allows us to include files only when they're
  59 // needed. If we've got a cached copy, for example, only Zend_Cache is loaded.
  60 function autoload($class_name) {
  61         static $dir = null;
  62         if ($dir === null) $dir = dirname(__FILE__).'/libraries/';
  63         static $mapping = array(
  64                 // Include FeedCreator for RSS/Atom creation
  65                 'FeedWriter' => 'feedwriter/FeedWriter.php',
  66                 'FeedItem' => 'feedwriter/FeedItem.php',
  67                 // Include ContentExtractor and Readability for identifying and extracting content from URLs
  68                 'ContentExtractor' => 'content-extractor/ContentExtractor.php',
  69                 'SiteConfig' => 'content-extractor/SiteConfig.php',
  70                 'Readability' => 'readability/Readability.php',
  71                 // Include Humble HTTP Agent to allow parallel requests and response caching
  72                 'HumbleHttpAgent' => 'humble-http-agent/HumbleHttpAgent.php',
  73                 'SimplePie_HumbleHttpAgent' => 'humble-http-agent/SimplePie_HumbleHttpAgent.php',
  74                 'CookieJar' => 'humble-http-agent/CookieJar.php',
  75                 // Include Zend Cache to improve performance (cache results)
  76                 'Zend_Cache' => 'Zend/Cache.php',
  77                 // Language detect
  78                 'Text_LanguageDetect' => 'language-detect/LanguageDetect.php',
  79                 // HTML5 Lib
  80                 'HTML5_Parser' => 'html5/Parser.php',
  81                 // htmLawed - used if XSS filter is enabled (xss_filter)
  82                 'htmLawed' => 'htmLawed/htmLawed.php'
  83         );
  84         if (isset($mapping[$class_name])) {
  85                 debug("** Loading class $class_name ({$mapping[$class_name]})");
  86                 require $dir.$mapping[$class_name];
  87                 return true;
  88         } else {
  89                 return false;
  90         }
  91 }
  92 spl_autoload_register('autoload');
  93 require dirname(__FILE__).'/libraries/simplepie/autoloader.php';
  94
  95 ////////////////////////////////
  96 // Load config file
  97 ////////////////////////////////
  98 require dirname(__FILE__).'/config.php';
  99
 100 ////////////////////////////////
 101 // Prevent indexing/following by search engines because:
 102 // 1. The content is already public and presumably indexed (why create duplicates?)
 103 // 2. Not doing so might increase number of requests from search engines, thus increasing server load
 104 // Note: feed readers and services such as Yahoo Pipes will not be affected by this header.
 105 // Note: Using Disallow in a robots.txt file will be more effective (search engines will check
 106 // that before even requesting makefulltextfeed.php).
 107 ////////////////////////////////
 108 header('X-Robots-Tag: noindex, nofollow');
 109
 110 ////////////////////////////////
 111 // Check if service is enabled
 112 ////////////////////////////////
 113 if (!$options->enabled) {
 114         die('The full-text RSS service is currently disabled');
 115 }
 116
 117 ////////////////////////////////
 118 // Debug mode?
 119 // See the config file for debug options.
 120 ////////////////////////////////
 121 $debug_mode = false;
 122 if (isset($_GET['debug'])) {
 123         if ($options->debug === true || $options->debug == 'user') {
 124                 $debug_mode = true;
 125         } elseif ($options->debug == 'admin') {
 126                 session_start();
 127                 $debug_mode = (@$_SESSION['auth'] == 1);
 128         }
 129         if ($debug_mode) {
 130                 header('Content-Type: text/plain; charset=utf-8');
 131         } else {
 132                 if ($options->debug == 'admin') {
 133                         die('You must be logged in to the <a href="admin/">admin area</a> to see debug output.');
 134                 } else {
 135                         die('Debugging is disabled.');
 136                 }
 137         }
 138 }
 139
 140 ////////////////////////////////
 141 // Check for APC
 142 ////////////////////////////////
 143 $options->apc = $options->apc && function_exists('apc_add');
 144 if ($options->apc) {
 145         debug('APC is enabled and available on server');
 146 } else {
 147         debug('APC is disabled or not available on server');
 148 }
 149
 150 ////////////////////////////////
 151 // Check for smart cache
 152 ////////////////////////////////
 153 $options->smart_cache = $options->smart_cache && function_exists('apc_inc');
 154
 155 ////////////////////////////////
 156 // Check for feed URL
 157 ////////////////////////////////
 158 if (!isset($_GET['url'])) {
 159         die('No URL supplied');
 160 }
 161 $url = trim($_GET['url']);
 162 if (strtolower(substr($url, 0, 7)) == 'feed://') {
 163         $url = 'http://'.substr($url, 7);
 164 }
 165 if (!preg_match('!^https?://.+!i', $url)) {
 166         $url = 'http://'.$url;
 167 }
 168
 169 $url = filter_var($url, FILTER_SANITIZE_URL);
 170 $test = filter_var($url, FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED);
 171 // deal with bug http://bugs.php.net/51192 (present in PHP 5.2.13 and PHP 5.3.2)
 172 if ($test === false) {
 173         $test = filter_var(strtr($url, '-', '_'), FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED);
 174 }
 175 if ($test !== false && $test !== null && preg_match('!^https?://!', $url)) {
 176         // all okay
 177         unset($test);
 178 } else {
 179         die('Invalid URL supplied');
 180 }
 181 debug("Supplied URL: $url");
 182
 183 /////////////////////////////////
 184 // Redirect to hide API key
 185 /////////////////////////////////
 186 if (isset($_GET['key']) && ($key_index = array_search($_GET['key'], $options->api_keys)) !== false) {
 187         $host = $_SERVER['HTTP_HOST'];
 188         $path = rtrim(dirname($_SERVER['SCRIPT_NAME']), '/\\');
 189         $_qs_url = (strtolower(substr($url, 0, 7)) == 'http://') ? substr($url, 7) : $url;
 190         $redirect = 'http://'.htmlspecialchars($host.$path).'/makefulltextfeed.php?url='.urlencode($_qs_url);
 191         $redirect .= '&key='.$key_index;
 192         $redirect .= '&hash='.urlencode(sha1($_GET['key'].$url));
 193         if (isset($_GET['html'])) $redirect .= '&html='.urlencode($_GET['html']);
 194         if (isset($_GET['max'])) $redirect .= '&max='.(int)$_GET['max'];
 195         if (isset($_GET['links'])) $redirect .= '&links='.urlencode($_GET['links']);
 196         if (isset($_GET['exc'])) $redirect .= '&exc='.urlencode($_GET['exc']);
 197         if (isset($_GET['format'])) $redirect .= '&format='.urlencode($_GET['format']);
 198         if (isset($_GET['callback'])) $redirect .= '&callback='.urlencode($_GET['callback']);
 199         if (isset($_GET['l'])) $redirect .= '&l='.urlencode($_GET['l']);
 200         if (isset($_GET['xss'])) $redirect .= '&xss';
 201         if (isset($_GET['use_extracted_title'])) $redirect .= '&use_extracted_title';
 202         if (isset($_GET['debug'])) $redirect .= '&debug';
 203         if ($debug_mode) {
 204                 debug('Redirecting to hide access key, follow URL below to continue');
 205                 debug("Location: $redirect");
 206         } else {
 207                 header("Location: $redirect");
 208         }
 209         exit;
 210 }
 211
 212 ///////////////////////////////////////////////
 213 // Set timezone.
 214 // Prevents warnings, but needs more testing -
 215 // perhaps if timezone is set in php.ini we
 216 // don't need to set it at all...
 217 ///////////////////////////////////////////////
 218 if (!ini_get('date.timezone') || !@date_default_timezone_set(ini_get('date.timezone'))) {
 219         date_default_timezone_set('UTC');
 220 }
 221
 222 ///////////////////////////////////////////////
 223 // Check if the request is explicitly for an HTML page
 224 ///////////////////////////////////////////////
 225 $html_only = (isset($_GET['html']) && ($_GET['html'] == '1' || $_GET['html'] == 'true'));
 226
 227 ///////////////////////////////////////////////
 228 // Check if valid key supplied
 229 ///////////////////////////////////////////////
 230 $valid_key = false;
 231 if (isset($_GET['key']) && isset($_GET['hash']) && isset($options->api_keys[(int)$_GET['key']])) {
 232         $valid_key = ($_GET['hash'] == sha1($options->api_keys[(int)$_GET['key']].$url));
 233 }
 234 $key_index = ($valid_key) ? (int)$_GET['key'] : 0;
 235 if (!$valid_key && $options->key_required) {
 236         die('A valid key must be supplied');
 237 }
 238 if (!$valid_key && isset($_GET['key']) && $_GET['key'] != '') {
 239         die('The entered key is invalid');
 240 }
 241
 242 if (file_exists('custom_init.php')) require 'custom_init.php';
 243
 244 ///////////////////////////////////////////////
 245 // Check URL against list of blacklisted URLs
 246 ///////////////////////////////////////////////
 247 if (!url_allowed($url)) die('URL blocked');
 248
 249 ///////////////////////////////////////////////
 250 // Max entries
 251 // see config.php to find these values
 252 ///////////////////////////////////////////////
 253 if (isset($_GET['max'])) {
 254         $max = (int)$_GET['max'];
 255         if ($valid_key) {
 256                 $max = min($max, $options->max_entries_with_key);
 257         } else {
 258                 $max = min($max, $options->max_entries);
 259         }
 260 } else {
 261         if ($valid_key) {
 262                 $max = $options->default_entries_with_key;
 263         } else {
 264                 $max = $options->default_entries;
 265         }
 266 }
 267
 268 ///////////////////////////////////////////////
 269 // Link handling
 270 ///////////////////////////////////////////////
 271 if (isset($_GET['links']) && in_array($_GET['links'], array('preserve', 'footnotes', 'remove'))) {
 272         $links = $_GET['links'];
 273 } else {
 274         $links = 'preserve';
 275 }
 276
 277 ///////////////////////////////////////////////
 278 // Favour item titles in feed?
 279 ///////////////////////////////////////////////
 280 $favour_feed_titles = true;
 281 if ($options->favour_feed_titles == 'user') {
 282         $favour_feed_titles = !isset($_GET['use_extracted_title']);
 283 } else {
 284         $favour_feed_titles = $options->favour_feed_titles;
 285 }
 286
 287 ///////////////////////////////////////////////
 288 // Exclude items if extraction fails
 289 ///////////////////////////////////////////////
 290 if ($options->exclude_items_on_fail === 'user') {
 291         $exclude_on_fail = (isset($_GET['exc']) && ($_GET['exc'] == '1'));
 292 } else {
 293         $exclude_on_fail = $options->exclude_items_on_fail;
 294 }
 295
 296 ///////////////////////////////////////////////
 297 // Detect language
 298 ///////////////////////////////////////////////
 299 if ($options->detect_language === 'user') {
 300         if (isset($_GET['l'])) {
 301                 $detect_language = (int)$_GET['l'];
 302         } else {
 303                 $detect_language = 1;
 304         }
 305 } else {
 306         $detect_language = $options->detect_language;
 307 }
 308
 309 if ($detect_language >= 2) {
 310         $language_codes = array('albanian' => 'sq','arabic' => 'ar','azeri' => 'az','bengali' => 'bn','bulgarian' => 'bg',
 311         'cebuano' => 'ceb', // ISO 639-2
 312         'croatian' => 'hr','czech' => 'cs','danish' => 'da','dutch' => 'nl','english' => 'en','estonian' => 'et','farsi' => 'fa','finnish' => 'fi','french' => 'fr','german' => 'de','hausa' => 'ha',
 313         'hawaiian' => 'haw', // ISO 639-2
 314         'hindi' => 'hi','hungarian' => 'hu','icelandic' => 'is','indonesian' => 'id','italian' => 'it','kazakh' => 'kk','kyrgyz' => 'ky','latin' => 'la','latvian' => 'lv','lithuanian' => 'lt','macedonian' => 'mk','mongolian' => 'mn','nepali' => 'ne','norwegian' => 'no','pashto' => 'ps',
 315         'pidgin' => 'cpe', // ISO 639-2
 316         'polish' => 'pl','portuguese' => 'pt','romanian' => 'ro','russian' => 'ru','serbian' => 'sr','slovak' => 'sk','slovene' => 'sl','somali' => 'so','spanish' => 'es','swahili' => 'sw','swedish' => 'sv','tagalog' => 'tl','turkish' => 'tr','ukrainian' => 'uk','urdu' => 'ur','uzbek' => 'uz','vietnamese' => 'vi','welsh' => 'cy');
 317 }
 318 $use_cld = extension_loaded('cld') && (version_compare(PHP_VERSION, '5.3.0') >= 0);
 319
 320 /////////////////////////////////////
 321 // Check for valid format
 322 // (stick to RSS (or RSS as JSON) for the time being)
 323 /////////////////////////////////////
 324 if (isset($_GET['format']) && $_GET['format'] == 'json') {
 325         $format = 'json';
 326 } else {
 327         $format = 'rss';
 328 }
 329
 330 /////////////////////////////////////
 331 // Should we do XSS filtering?
 332 /////////////////////////////////////
 333 if ($options->xss_filter === 'user') {
 334         $xss_filter = isset($_GET['xss']);
 335 } else {
 336         $xss_filter = $options->xss_filter;
 337 }
 338 if (!$xss_filter && isset($_GET['xss'])) {
 339         die('XSS filtering is disabled in config');
 340 }
 341
 342 /////////////////////////////////////
 343 // Check for JSONP
 344 // Regex from https://gist.github.com/1217080
 345 /////////////////////////////////////
 346 $callback = null;
 347 if ($format =='json' && isset($_GET['callback'])) {
 348         $callback = trim($_GET['callback']);
 349         foreach (explode('.', $callback) as $_identifier) {
 350                 if (!preg_match('/^[a-zA-Z_$][0-9a-zA-Z_$]*(?:\[(?:".+"|\'.+\'|\d+)\])*?$/', $_identifier)) {
 351                         die('Invalid JSONP callback');
 352                 }
 353         }
 354         debug("JSONP callback: $callback");
 355 }
 356
 357 //////////////////////////////////
 358 // Enable Cross-Origin Resource Sharing (CORS)
 359 //////////////////////////////////
 360 if ($options->cors) header('Access-Control-Allow-Origin: *');
 361
 362 //////////////////////////////////
 363 // Check for cached copy
 364 //////////////////////////////////
 365 if ($options->caching) {
 366         debug('Caching is enabled...');
 367         $cache_id = md5($max.$url.$valid_key.$links.$favour_feed_titles.$xss_filter.$exclude_on_fail.$format.$detect_language.(int)isset($_GET['pubsub']));
 368         $check_cache = true;
 369         if ($options->apc && $options->smart_cache) {
 370                 apc_add("cache.$cache_id", 0, 10*60);
 371                 $apc_cache_hits = (int)apc_fetch("cache.$cache_id");
 372                 $check_cache = ($apc_cache_hits >= 2);
 373                 apc_inc("cache.$cache_id");
 374                 if ($check_cache) {
 375                         debug('Cache key found in APC, we\'ll try to load cache file from disk');
 376                 } else {
 377                         debug('Cache key not found in APC');
 378                 }
 379         }
 380         if ($check_cache) {
 381                 $cache = get_cache();
 382                 if ($data = $cache->load($cache_id)) {
 383                         if ($debug_mode) {
 384                                 debug('Loaded cached copy');
 385                                 exit;
 386                         }
 387                         if ($format == 'json') {
 388                                 if ($callback === null) {
 389                                         header('Content-type: application/json; charset=UTF-8');
 390                                 } else {
 391                                         header('Content-type: application/javascript; charset=UTF-8');
 392                                 }
 393                         } else {
 394                                 header('Content-type: text/xml; charset=UTF-8');
 395                                 header('X-content-type-options: nosniff');
 396                         }
 397                         if (headers_sent()) die('Some data has already been output, can\'t send RSS file');
 398                         if ($callback) {
 399                                 echo "$callback($data);";
 400                         } else {
 401                                 echo $data;
 402                         }
 403                         exit;
 404                 }
 405         }
 406 }
 407
 408 //////////////////////////////////
 409 // Set Expires header
 410 //////////////////////////////////
 411 if (!$debug_mode) {
 412         header('Expires: ' . gmdate('D, d M Y H:i:s', time()+(60*10)) . ' GMT');
 413 }
 414
 415 //////////////////////////////////
 416 // Set up HTTP agent
 417 //////////////////////////////////
 418 $http = new HumbleHttpAgent();
 419 $http->debug = $debug_mode;
 420 $http->userAgentMap = $options->user_agents;
 421 $http->headerOnlyTypes = array_keys($options->content_type_exc);
 422 $http->rewriteUrls = $options->rewrite_url;
 423
 424 //////////////////////////////////
 425 // Set up Content Extractor
 426 //////////////////////////////////
 427 global $extractor;
 428 $extractor = new ContentExtractor(dirname(__FILE__).'/site_config/custom', dirname(__FILE__).'/site_config/standard');
 429 $extractor->debug = $debug_mode;
 430 SiteConfig::$debug = $debug_mode;
 431 SiteConfig::use_apc($options->apc);
 432 $extractor->fingerprints = $options->fingerprints;
 433 $extractor->allowedParsers = $options->allowed_parsers;
 434
 435 ////////////////////////////////
 436 // Get RSS/Atom feed
 437 ////////////////////////////////
 438 if (!$html_only) {
 439         debug('--------');
 440         debug("Attempting to process URL as feed");
 441         // Send user agent header showing PHP (prevents a HTML response from feedburner)
 442         $http->userAgentDefault = HumbleHttpAgent::UA_PHP;
 443         // configure SimplePie HTTP extension class to use our HumbleHttpAgent instance
 444         SimplePie_HumbleHttpAgent::set_agent($http);
 445         $feed = new SimplePie();
 446         // some feeds use the text/html content type - force_feed tells SimplePie to process anyway
 447         $feed->force_feed(true);
 448         $feed->set_file_class('SimplePie_HumbleHttpAgent');
 449         //$feed->set_feed_url($url); // colons appearing in the URL's path get encoded
 450         $feed->feed_url = $url;
 451         $feed->set_autodiscovery_level(SIMPLEPIE_LOCATOR_NONE);
 452         $feed->set_timeout(20);
 453         $feed->enable_cache(false);
 454         $feed->set_stupidly_fast(true);
 455         $feed->enable_order_by_date(false); // we don't want to do anything to the feed
 456         $feed->set_url_replacements(array());
 457         // initialise the feed
 458         // the @ suppresses notices which on some servers causes a 500 internal server error
 459         $result = @$feed->init();
 460         //$feed->handle_content_type();
 461         //$feed->get_title();
 462         if ($result && (!is_array($feed->data) || count($feed->data) == 0)) {
 463                 die('Sorry, no feed items found');
 464         }
 465         // from now on, we'll identify ourselves as a browser
 466         $http->userAgentDefault = HumbleHttpAgent::UA_BROWSER;
 467 }
 468
 469 ////////////////////////////////////////////////////////////////////////////////
 470 // Our given URL is not a feed, so let's create our own feed with a single item:
 471 // the given URL. This basically treats all non-feed URLs as if they were
 472 // single-item feeds.
 473 ////////////////////////////////////////////////////////////////////////////////
 474 $isDummyFeed = false;
 475 if ($html_only || !$result) {
 476         debug('--------');
 477         debug("Constructing a single-item feed from URL");
 478         $isDummyFeed = true;
 479         unset($feed, $result);
 480         // create single item dummy feed object
 481         class DummySingleItemFeed {
 482                 public $item;
 483                 function __construct($url) { $this->item = new DummySingleItem($url); }
 484                 public function get_title() { return ''; }
 485                 public function get_description() { return 'Content extracted from '.$this->item->url; }
 486                 public function get_link() { return $this->item->url; }
 487                 public function get_language() { return false; }
 488                 public function get_image_url() { return false; }
 489                 public function get_items($start=0, $max=1) { return array(0=>$this->item); }
 490         }
 491         class DummySingleItem {
 492                 public $url;
 493                 function __construct($url) { $this->url = $url; }
 494                 public function get_permalink() { return $this->url; }
 495                 public function get_title() { return null; }
 496                 public function get_date($format='') { return false; }
 497                 public function get_author($key=0) { return null; }
 498                 public function get_authors() { return null; }
 499                 public function get_description() { return ''; }
 500                 public function get_enclosure($key=0, $prefer=null) { return null; }
 501                 public function get_enclosures() { return null; }
 502                 public function get_categories() { return null; }
 503         }
 504         $feed = new DummySingleItemFeed($url);
 505 }
 506
 507 ////////////////////////////////////////////
 508 // Create full-text feed
 509 ////////////////////////////////////////////
 510 $output = new FeedWriter();
 511 $output->setTitle(strip_tags($feed->get_title()));
 512 $output->setDescription(strip_tags($feed->get_description()));
 513 $output->setXsl('css/feed.xsl'); // Chrome uses this, most browsers ignore it
 514 if ($valid_key && isset($_GET['pubsub'])) { // used only on fivefilters.org at the moment
 515         $output->addHub('http://fivefilters.superfeedr.com/');
 516         $output->addHub('http://pubsubhubbub.appspot.com/');
 517         $output->setSelf('http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
 518 }
 519 $output->setLink($feed->get_link()); // Google Reader uses this for pulling in favicons
 520 if ($img_url = $feed->get_image_url()) {
 521         $output->setImage($feed->get_title(), $feed->get_link(), $img_url);
 522 }
 523
 524 ////////////////////////////////////////////
 525 // Loop through feed items
 526 ////////////////////////////////////////////
 527 $items = $feed->get_items(0, $max);
 528 // Request all feed items in parallel (if supported)
 529 $urls_sanitized = array();
 530 $urls = array();
 531 foreach ($items as $key => $item) {
 532         $permalink = htmlspecialchars_decode($item->get_permalink());
 533         // Colons in URL path segments get encoded by SimplePie, yet some sites expect them unencoded
 534         $permalink = str_replace('%3A', ':', $permalink);
 535         // validateUrl() strips non-ascii characters
 536         // simplepie already sanitizes URLs so let's not do it again here.
 537         //$permalink = $http->validateUrl($permalink);
 538         if ($permalink) {
 539                 $urls_sanitized[] = $permalink;
 540         }
 541         $urls[$key] = $permalink;
 542 }
 543 debug('--------');
 544 debug('Fetching feed items');
 545 $http->fetchAll($urls_sanitized);
 546 //$http->cacheAll();
 547
 548 // count number of items added to full feed
 549 $item_count = 0;
 550
 551 foreach ($items as $key => $item) {
 552         debug('--------');
 553         debug('Processing feed item '.($item_count+1));
 554         $do_content_extraction = true;
 555         $extract_result = false;
 556         $text_sample = null;
 557         $permalink = $urls[$key];
 558         debug("Item URL: $permalink");
 559         $extracted_title = '';
 560         $feed_item_title = $item->get_title();
 561         if ($feed_item_title !== null) {
 562                 $feed_item_title = strip_tags(htmlspecialchars_decode($feed_item_title));
 563         }
 564         $newitem = $output->createNewItem();
 565         $newitem->setTitle($feed_item_title);
 566         if ($valid_key && isset($_GET['pubsub'])) { // used only on fivefilters.org at the moment
 567                 if ($permalink !== false) {
 568                         $newitem->setLink('http://fivefilters.org/content-only/redirect.php?url='.urlencode($permalink));
 569                 } else {
 570                         $newitem->setLink('http://fivefilters.org/content-only/redirect.php?url='.urlencode($item->get_permalink()));
 571                 }
 572         } else {
 573                 if ($permalink !== false) {
 574                         $newitem->setLink($permalink);
 575                 } else {
 576                         $newitem->setLink($item->get_permalink());
 577                 }
 578         }
 579         //if ($permalink && ($response = $http->get($permalink, true)) && $response['status_code'] < 300) {
 580         // Allowing error codes - some sites return correct content with error status
 581         // e.g. prospectmagazine.co.uk returns 403
 582         if ($permalink && ($response = $http->get($permalink, true)) && ($response['status_code'] < 300 || $response['status_code'] > 400)) {
 583                 $effective_url = $response['effective_url'];
 584                 if (!url_allowed($effective_url)) continue;
 585                 // check if action defined for returned Content-Type
 586                 $mime_info = get_mime_action_info($response['headers']);
 587                 if (isset($mime_info['action'])) {
 588                         if ($mime_info['action'] == 'exclude') {
 589                                 continue; // skip this feed item entry
 590                         } elseif ($mime_info['action'] == 'link') {
 591                                 if ($mime_info['type'] == 'image') {
 592                                         $html = "<a href=\"$effective_url\"><img src=\"$effective_url\" alt=\"{$mime_info['name']}\" /></a>";
 593                                 } else {
 594                                         $html = "<a href=\"$effective_url\">Download {$mime_info['name']}</a>";
 595                                 }
 596                                 $extracted_title = $mime_info['name'];
 597                                 $do_content_extraction = false;
 598                         }
 599                 }
 600                 if ($do_content_extraction) {
 601                         $html = $response['body'];
 602                         // remove strange things
 603                         $html = str_replace('</[>', '', $html);
 604                         $html = convert_to_utf8($html, $response['headers']);
 605                         // check site config for single page URL - fetch it if found
 606                         $is_single_page = false;
 607                         if ($single_page_response = getSinglePage($item, $html, $effective_url)) {
 608                                 $is_single_page = true;
 609                                 $html = $single_page_response['body'];
 610                                 // remove strange things
 611                                 $html = str_replace('</[>', '', $html);
 612                                 $html = convert_to_utf8($html, $single_page_response['headers']);
 613                                 $effective_url = $single_page_response['effective_url'];
 614                                 debug("Retrieved single-page view from $effective_url");
 615                                 unset($single_page_response);
 616                         }
 617                         debug('--------');
 618                         debug('Attempting to extract content');
 619                         $extract_result = $extractor->process($html, $effective_url);
 620                         $readability = $extractor->readability;
 621                         $content_block = ($extract_result) ? $extractor->getContent() : null;
 622                         $extracted_title = ($extract_result) ? $extractor->getTitle() : '';
 623                         // Deal with multi-page articles
 624                         //die('Next: '.$extractor->getNextPageUrl());
 625                         $is_multi_page = (!$is_single_page && $extract_result && $extractor->getNextPageUrl());
 626                         if ($options->multipage && $is_multi_page) {
 627                                 debug('--------');
 628                                 debug('Attempting to process multi-page article');
 629                                 $multi_page_urls = array();
 630                                 $multi_page_content = array();
 631                                 while ($next_page_url = $extractor->getNextPageUrl()) {
 632                                         debug('--------');
 633                                         debug('Processing next page: '.$next_page_url);
 634                                         // If we've got URL, resolve against $url
 635                                         if ($next_page_url = makeAbsoluteStr($effective_url, $next_page_url)) {
 636                                                 // check it's not what we have already!
 637                                                 if (!in_array($next_page_url, $multi_page_urls)) {
 638                                                         // it's not, so let's attempt to fetch it
 639                                                         $multi_page_urls[] = $next_page_url;
 640                                                         $_prev_ref = $http->referer;
 641                                                         if (($response = $http->get($next_page_url, true)) && $response['status_code'] < 300) {
 642                                                                 // make sure mime type is not something with a different action associated
 643                                                                 $page_mime_info = get_mime_action_info($response['headers']);
 644                                                                 if (!isset($page_mime_info['action'])) {
 645                                                                         $html = $response['body'];
 646                                                                         // remove strange things
 647                                                                         $html = str_replace('</[>', '', $html);
 648                                                                         $html = convert_to_utf8($html, $response['headers']);
 649                                                                         if ($extractor->process($html, $next_page_url)) {
 650                                                                                 $multi_page_content[] = $extractor->getContent();
 651                                                                                 continue;
 652                                                                         } else { debug('Failed to extract content'); }
 653                                                                 } else { debug('MIME type requires different action'); }
 654                                                         } else { debug('Failed to fetch URL'); }
 655                                                 } else { debug('URL already processed'); }
 656                                         } else { debug('Failed to resolve against '.$effective_url); }
 657                                         // failed to process next_page_url, so cancel further requests
 658                                         $multi_page_content = array();
 659                                         break;
 660                                 }
 661                                 // did we successfully deal with this multi-page article?
 662                                 if (empty($multi_page_content)) {
 663                                         debug('Failed to extract all parts of multi-page article, so not going to include them');
 664                                         $multi_page_content[] = $readability->dom->createElement('p')->innerHTML = '<em>This article appears to continue on subsequent pages which we could not extract</em>';
 665                                 }
 666                                 foreach ($multi_page_content as $_page) {
 667                                         $_page = $content_block->ownerDocument->importNode($_page, true);
 668                                         $content_block->appendChild($_page);
 669                                 }
 670                                 unset($multi_page_urls, $multi_page_content, $page_mime_info, $next_page_url);
 671                         }
 672                 }
 673                 // use extracted title for both feed and item title if we're using single-item dummy feed
 674                 if ($isDummyFeed) {
 675                         $output->setTitle($extracted_title);
 676                         $newitem->setTitle($extracted_title);
 677                 } else {
 678                         // use extracted title instead of feed item title?
 679                         if (!$favour_feed_titles && $extracted_title != '') {
 680                                 debug('Using extracted title in generated feed');
 681                                 $newitem->setTitle($extracted_title);
 682                         }
 683                 }
 684         }
 685         if ($do_content_extraction) {
 686                 // if we failed to extract content...
 687                 if (!$extract_result) {
 688                         if ($exclude_on_fail) {
 689                                 debug('Failed to extract, so skipping (due to exclude on fail parameter)');
 690                                 continue; // skip this and move to next item
 691                         }
 692                         //TODO: get text sample for language detection
 693                         $html = $options->error_message;
 694                         // keep the original item description
 695                         $html .= $item->get_description();
 696                 } else {
 697                         $readability->clean($content_block, 'select');
 698                         if ($options->rewrite_relative_urls) makeAbsolute($effective_url, $content_block);
 699                         // footnotes
 700                         if (($links == 'footnotes') && (strpos($effective_url, 'wikipedia.org') === false)) {
 701                                 $readability->addFootnotes($content_block);
 702                         }
 703                         // remove nesting: <div><div><div><p>test</p></div></div></div> = <p>test</p>
 704                         while ($content_block->childNodes->length == 1 && $content_block->firstChild->nodeType === XML_ELEMENT_NODE) {
 705                                 // only follow these tag names
 706                                 if (!in_array(strtolower($content_block->tagName), array('div', 'article', 'section', 'header', 'footer'))) break;
 707                                 //$html = $content_block->firstChild->innerHTML; // FTR 2.9.5
 708                                 $content_block = $content_block->firstChild;
 709                         }
 710                         // convert content block to HTML string
 711                         // Need to preserve things like body: //img[@id='feature']
 712                         if (in_array(strtolower($content_block->tagName), array('div', 'article', 'section', 'header', 'footer'))) {
 713                                 $html = $content_block->innerHTML;
 714                         } else {
 715                                 $html = $content_block->ownerDocument->saveXML($content_block); // essentially outerHTML
 716                         }
 717                         unset($content_block);
 718                         // post-processing cleanup
 719                         $html = preg_replace('!<p>[\s\h\v]*</p>!u', '', $html);
 720                         if ($links == 'remove') {
 721                                 $html = preg_replace('!</?a[^>]*>!', '', $html);
 722                         }
 723                         // get text sample for language detection
 724                         $text_sample = strip_tags(substr($html, 0, 500));
 725                         $html = make_substitutions($options->message_to_prepend).$html;
 726                         $html .= make_substitutions($options->message_to_append);
 727                 }
 728         }
 729
 730                 if ($valid_key && isset($_GET['pubsub'])) { // used only on fivefilters.org at the moment
 731                         $newitem->addElement('guid', 'http://fivefilters.org/content-only/redirect.php?url='.urlencode($item->get_permalink()), array('isPermaLink'=>'false'));
 732                 } else {
 733                         $newitem->addElement('guid', $item->get_permalink(), array('isPermaLink'=>'true'));
 734                 }
 735                 // filter xss?
 736                 if ($xss_filter) {
 737                         debug('Filtering HTML to remove XSS');
 738                         $html = htmLawed::hl($html, array('safe'=>1, 'deny_attribute'=>'style', 'comment'=>1, 'cdata'=>1));
 739                 }
 740                 $newitem->setDescription($html);
 741
 742                 // set date
 743                 if ((int)$item->get_date('U') > 0) {
 744                         $newitem->setDate((int)$item->get_date('U'));
 745                 } elseif ($extractor->getDate()) {
 746                         $newitem->setDate($extractor->getDate());
 747                 }
 748
 749                 // add authors
 750                 if ($authors = $item->get_authors()) {
 751                         foreach ($authors as $author) {
 752                                 // for some feeds, SimplePie stores author's name as email, e.g. http://feeds.feedburner.com/nymag/intel
 753                                 if ($author->get_name() !== null) {
 754                                         $newitem->addElement('dc:creator', $author->get_name());
 755                                 } elseif ($author->get_email() !== null) {
 756                                         $newitem->addElement('dc:creator', $author->get_email());
 757                                 }
 758                         }
 759                 } elseif ($authors = $extractor->getAuthors()) {
 760                         //TODO: make sure the list size is reasonable
 761                         foreach ($authors as $author) {
 762                                 // TODO: xpath often selects authors from other articles linked from the page.
 763                                 // for now choose first item
 764                                 $newitem->addElement('dc:creator', $author);
 765                                 break;
 766                         }
 767                 }
 768
 769                 // add language
 770                 if ($detect_language) {
 771                         $language = $extractor->getLanguage();
 772                         if (!$language) $language = $feed->get_language();
 773                         if (($detect_language == 3 || (!$language && $detect_language == 2)) && $text_sample) {
 774                                 try {
 775                                         if ($use_cld) {
 776                                                 // Use PHP-CLD extension
 777                                                 $php_cld = 'CLD\detect'; // in quotes to prevent PHP 5.2 parse error
 778                                                 $res = $php_cld($text_sample);
 779                                                 if (is_array($res) && count($res) > 0) {
 780                                                         $language = $res[0]['code'];
 781                                                 }
 782                                         } else {
 783                                                 //die('what');
 784                                                 // Use PEAR's Text_LanguageDetect
 785                                                 if (!isset($l)) {
 786                                                         $l = new Text_LanguageDetect('libraries/language-detect/lang.dat', 'libraries/language-detect/unicode_blocks.dat');
 787                                                 }
 788                                                 $l_result = $l->detect($text_sample, 1);
 789                                                 if (count($l_result) > 0) {
 790                                                         $language = $language_codes[key($l_result)];
 791                                                 }
 792                                         }
 793                                 } catch (Exception $e) {
 794                                         //die('error: '.$e);
 795                                         // do nothing
 796                                 }
 797                         }
 798                         if ($language && (strlen($language) < 7)) {
 799                                 $newitem->addElement('dc:language', $language);
 800                         }
 801                 }
 802
 803                 // add MIME type (if it appeared in our exclusions lists)
 804                 if (isset($mime_info['mime'])) $newitem->addElement('dc:format', $mime_info['mime']);
 805                 // add effective URL (URL after redirects)
 806                 if (isset($effective_url)) {
 807                         //TODO: ensure $effective_url is valid witout - sometimes it causes problems, e.g.
 808                         //http://www.siasat.pk/forum/showthread.php?108883-Pakistan-Chowk-by-Rana-Mubashir-\96-25th-March-2012-Special-Program-from-Liari-(Karachi)
 809                         //temporary measure: use utf8_encode()
 810                         $newitem->addElement('dc:identifier', remove_url_cruft(utf8_encode($effective_url)));
 811                 } else {
 812                         $newitem->addElement('dc:identifier', remove_url_cruft($item->get_permalink()));
 813                 }
 814
 815                 // add categories
 816                 if ($categories = $item->get_categories()) {
 817                         foreach ($categories as $category) {
 818                                 if ($category->get_label() !== null) {
 819                                         $newitem->addElement('category', $category->get_label());
 820                                 }
 821                         }
 822                 }
 823
 824                 // check for enclosures
 825                 if ($options->keep_enclosures) {
 826                         if ($enclosures = $item->get_enclosures()) {
 827                                 foreach ($enclosures as $enclosure) {
 828                                         // thumbnails
 829                                         foreach ((array)$enclosure->get_thumbnails() as $thumbnail) {
 830                                                 $newitem->addElement('media:thumbnail', '', array('url'=>$thumbnail));
 831                                         }
 832                                         if (!$enclosure->get_link()) continue;
 833                                         $enc = array();
 834                                         // Media RSS spec ($enc): http://search.yahoo.com/mrss
 835                                         // SimplePie methods ($enclosure): http://simplepie.org/wiki/reference/start#methods4
 836                                         $enc['url'] = $enclosure->get_link();
 837                                         if ($enclosure->get_length()) $enc['fileSize'] = $enclosure->get_length();
 838                                         if ($enclosure->get_type()) $enc['type'] = $enclosure->get_type();
 839                                         if ($enclosure->get_medium()) $enc['medium'] = $enclosure->get_medium();
 840                                         if ($enclosure->get_expression()) $enc['expression'] = $enclosure->get_expression();
 841                                         if ($enclosure->get_bitrate()) $enc['bitrate'] = $enclosure->get_bitrate();
 842                                         if ($enclosure->get_framerate()) $enc['framerate'] = $enclosure->get_framerate();
 843                                         if ($enclosure->get_sampling_rate()) $enc['samplingrate'] = $enclosure->get_sampling_rate();
 844                                         if ($enclosure->get_channels()) $enc['channels'] = $enclosure->get_channels();
 845                                         if ($enclosure->get_duration()) $enc['duration'] = $enclosure->get_duration();
 846                                         if ($enclosure->get_height()) $enc['height'] = $enclosure->get_height();
 847                                         if ($enclosure->get_width()) $enc['width'] = $enclosure->get_width();
 848                                         if ($enclosure->get_language()) $enc['lang'] = $enclosure->get_language();
 849                                         $newitem->addElement('media:content', '', $enc);
 850                                 }
 851                         }
 852                 }
 853         /* } */
 854         $output->addItem($newitem);
 855         unset($html);
 856         $item_count++;
 857 }
 858
 859 // output feed
 860 debug('Done!');
 861 /*
 862 if ($debug_mode) {
 863         $_apc_data = apc_cache_info('user');
 864         var_dump($_apc_data); exit;
 865 }
 866 */
 867 if (!$debug_mode) {
 868         if ($callback) echo "$callback("; // if $callback is set, $format also == 'json'
 869         if ($format == 'json') $output->setFormat(($callback === null) ? JSON : JSONP);
 870         $add_to_cache = $options->caching;
 871         // is smart cache mode enabled?
 872         if ($add_to_cache && $options->apc && $options->smart_cache) {
 873                 // yes, so only cache if this is the second request for this URL
 874                 $add_to_cache = ($apc_cache_hits >= 2);
 875                 // purge cache
 876                 if ($options->cache_cleanup > 0) {
 877                         if (rand(1, $options->cache_cleanup) == 1) {
 878                                 // apc purge code adapted from from http://www.thimbleopensource.com/tutorials-snippets/php-apc-expunge-script
 879                                 $_apc_data = apc_cache_info('user');
 880                                 foreach ($_apc_data['cache_list'] as $_apc_item) {
 881                                   if ($_apc_item['ttl'] > 0 && ($_apc_item['ttl'] + $_apc_item['creation_time'] < time())) {
 882                                         apc_delete($_apc_item['info']);
 883                                   }
 884                                 }
 885                         }
 886                 }
 887         }
 888         if ($add_to_cache) {
 889                 ob_start();
 890                 $output->genarateFeed();
 891                 $output = ob_get_contents();
 892                 ob_end_clean();
 893                 if ($html_only && $item_count == 0) {
 894                         // do not cache - in case of temporary server glitch at source URL
 895                 } else {
 896                         $cache = get_cache();
 897                         if ($add_to_cache) $cache->save($output, $cache_id);
 898                 }
 899                 echo $output;
 900         } else {
 901                 $output->genarateFeed();
 902         }
 903         if ($callback) echo ');';
 904 }
 905
 906 ///////////////////////////////
 907 // HELPER FUNCTIONS
 908 ///////////////////////////////
 909
 910 function url_allowed($url) {
 911         global $options;
 912         if (!empty($options->allowed_urls)) {
 913                 $allowed = false;
 914                 foreach ($options->allowed_urls as $allowurl) {
 915                         if (stristr($url, $allowurl) !== false) {
 916                                 $allowed = true;
 917                                 break;
 918                         }
 919                 }
 920                 if (!$allowed) return false;
 921         } else {
 922                 foreach ($options->blocked_urls as $blockurl) {
 923                         if (stristr($url, $blockurl) !== false) {
 924                                 return false;
 925                         }
 926                 }
 927         }
 928         return true;
 929 }
 930
 931 //////////////////////////////////////////////
 932 // Convert $html to UTF8
 933 // (uses HTTP headers and HTML to find encoding)
 934 // adapted from http://stackoverflow.com/questions/910793/php-detect-encoding-and-make-everything-utf-8
 935 //////////////////////////////////////////////
 936 function convert_to_utf8($html, $header=null)
 937 {
 938         $encoding = null;
 939         if ($html || $header) {
 940                 if (is_array($header)) $header = implode("\n", $header);
 941                 if (!$header || !preg_match_all('/^Content-Type:\s+([^;]+)(?:;\s*charset=["\']?([^;"\'\n]*))?/im', $header, $match, PREG_SET_ORDER)) {
 942                         // error parsing the response
 943                         debug('Could not find Content-Type header in HTTP response');
 944                 } else {
 945                         $match = end($match); // get last matched element (in case of redirects)
 946                         if (isset($match[2])) $encoding = trim($match[2], "\"' \r\n\0\x0B\t");
 947                 }
 948                 // TODO: check to see if encoding is supported (can we convert it?)
 949                 // If it's not, result will be empty string.
 950                 // For now we'll check for invalid encoding types returned by some sites, e.g. 'none'
 951                 // Problem URL: http://facta.co.jp/blog/archives/20111026001026.html
 952                 if (!$encoding || $encoding == 'none') {
 953                         // search for encoding in HTML - only look at the first 50000 characters
 954                         // 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
 955                         // TODO: improve this so it looks at smaller chunks first
 956                         $html_head = substr($html, 0, 50000);
 957                         if (preg_match('/^<\?xml\s+version=(?:"[^"]*"|\'[^\']*\')\s+encoding=("[^"]*"|\'[^\']*\')/s', $html_head, $match)) {
 958                                 $encoding = trim($match[1], '"\'');
 959                         } elseif (preg_match('/<meta\s+http-equiv=["\']?Content-Type["\']? content=["\'][^;]+;\s*charset=["\']?([^;"\'>]+)/i', $html_head, $match)) {
 960                                 $encoding = trim($match[1]);
 961                         } elseif (preg_match_all('/<meta\s+([^>]+)>/i', $html_head, $match)) {
 962                                 foreach ($match[1] as $_test) {
 963                                         if (preg_match('/charset=["\']?([^"\']+)/i', $_test, $_m)) {
 964                                                 $encoding = trim($_m[1]);
 965                                                 break;
 966                                         }
 967                                 }
 968                         }
 969                 }
 970                 if (isset($encoding)) $encoding = trim($encoding);
 971                 // trim is important here!
 972                 if (!$encoding || (strtolower($encoding) == 'iso-8859-1')) {
 973                         // replace MS Word smart qutoes
 974                         $trans = array();
 975                         $trans[chr(130)] = '&sbquo;';    // Single Low-9 Quotation Mark
 976                         $trans[chr(131)] = '&fnof;';    // Latin Small Letter F With Hook
 977                         $trans[chr(132)] = '&bdquo;';    // Double Low-9 Quotation Mark
 978                         $trans[chr(133)] = '&hellip;';    // Horizontal Ellipsis
 979                         $trans[chr(134)] = '&dagger;';    // Dagger
 980                         $trans[chr(135)] = '&Dagger;';    // Double Dagger
 981                         $trans[chr(136)] = '&circ;';    // Modifier Letter Circumflex Accent
 982                         $trans[chr(137)] = '&permil;';    // Per Mille Sign
 983                         $trans[chr(138)] = '&Scaron;';    // Latin Capital Letter S With Caron
 984                         $trans[chr(139)] = '&lsaquo;';    // Single Left-Pointing Angle Quotation Mark
 985                         $trans[chr(140)] = '&OElig;';    // Latin Capital Ligature OE
 986                         $trans[chr(145)] = '&lsquo;';    // Left Single Quotation Mark
 987                         $trans[chr(146)] = '&rsquo;';    // Right Single Quotation Mark
 988                         $trans[chr(147)] = '&ldquo;';    // Left Double Quotation Mark
 989                         $trans[chr(148)] = '&rdquo;';    // Right Double Quotation Mark
 990                         $trans[chr(149)] = '&bull;';    // Bullet
 991                         $trans[chr(150)] = '&ndash;';    // En Dash
 992                         $trans[chr(151)] = '&mdash;';    // Em Dash
 993                         $trans[chr(152)] = '&tilde;';    // Small Tilde
 994                         $trans[chr(153)] = '&trade;';    // Trade Mark Sign
 995                         $trans[chr(154)] = '&scaron;';    // Latin Small Letter S With Caron
 996                         $trans[chr(155)] = '&rsaquo;';    // Single Right-Pointing Angle Quotation Mark
 997                         $trans[chr(156)] = '&oelig;';    // Latin Small Ligature OE
 998                         $trans[chr(159)] = '&Yuml;';    // Latin Capital Letter Y With Diaeresis
 999                         $html = strtr($html, $trans);
1000                 }
1001                 if (!$encoding) {
1002                         debug('No character encoding found, so treating as UTF-8');
1003                         $encoding = 'utf-8';
1004                 } else {
1005                         debug('Character encoding: '.$encoding);
1006                         if (strtolower($encoding) != 'utf-8') {
1007                                 debug('Converting to UTF-8');
1008                                 $html = SimplePie_Misc::change_encoding($html, $encoding, 'utf-8');
1009                                 /*
1010                                 if (function_exists('iconv')) {
1011                                         // iconv appears to handle certain character encodings better than mb_convert_encoding
1012                                         $html = iconv($encoding, 'utf-8', $html);
1013                                 } else {
1014                                         $html = mb_convert_encoding($html, 'utf-8', $encoding);
1015                                 }
1016                                 */
1017                         }
1018                 }
1019         }
1020         return $html;
1021 }
1022
1023 function makeAbsolute($base, $elem) {
1024         $base = new SimplePie_IRI($base);
1025         // remove '//' in URL path (used to prevent URLs from resolving properly)
1026         // TODO: check if this is still the case
1027         if (isset($base->path)) $base->path = preg_replace('!//+!', '/', $base->path);
1028         foreach(array('a'=>'href', 'img'=>'src') as $tag => $attr) {
1029                 $elems = $elem->getElementsByTagName($tag);
1030                 for ($i = $elems->length-1; $i >= 0; $i--) {
1031                         $e = $elems->item($i);
1032                         //$e->parentNode->replaceChild($articleContent->ownerDocument->createTextNode($e->textContent), $e);
1033                         makeAbsoluteAttr($base, $e, $attr);
1034                 }
1035                 if (strtolower($elem->tagName) == $tag) makeAbsoluteAttr($base, $elem, $attr);
1036         }
1037 }
1038 function makeAbsoluteAttr($base, $e, $attr) {
1039         if ($e->hasAttribute($attr)) {
1040                 // Trim leading and trailing white space. I don't really like this but
1041                 // unfortunately it does appear on some sites. e.g.  <img src=" /path/to/image.jpg" />
1042                 $url = trim(str_replace('%20', ' ', $e->getAttribute($attr)));
1043                 $url = str_replace(' ', '%20', $url);
1044                 if (!preg_match('!https?://!i', $url)) {
1045                         if ($absolute = SimplePie_IRI::absolutize($base, $url)) {
1046                                 $e->setAttribute($attr, $absolute);
1047                         }
1048                 }
1049         }
1050 }
1051 function makeAbsoluteStr($base, $url) {
1052         $base = new SimplePie_IRI($base);
1053         // remove '//' in URL path (causes URLs not to resolve properly)
1054         if (isset($base->path)) $base->path = preg_replace('!//+!', '/', $base->path);
1055         if (preg_match('!^https?://!i', $url)) {
1056                 // already absolute
1057                 return $url;
1058         } else {
1059                 if ($absolute = SimplePie_IRI::absolutize($base, $url)) {
1060                         return $absolute;
1061                 }
1062                 return false;
1063         }
1064 }
1065 // returns single page response, or false if not found
1066 function getSinglePage($item, $html, $url) {
1067         global $http, $extractor;
1068         debug('Looking for site config files to see if single page link exists');
1069         $site_config = $extractor->buildSiteConfig($url, $html);
1070         $splink = null;
1071         if (!empty($site_config->single_page_link)) {
1072                 $splink = $site_config->single_page_link;
1073         } elseif (!empty($site_config->single_page_link_in_feed)) {
1074                 // single page link xpath is targeted at feed
1075                 $splink = $site_config->single_page_link_in_feed;
1076                 // so let's replace HTML with feed item description
1077                 $html = $item->get_description();
1078         }
1079         if (isset($splink)) {
1080                 // Build DOM tree from HTML
1081                 $readability = new Readability($html, $url);
1082                 $xpath = new DOMXPath($readability->dom);
1083                 // Loop through single_page_link xpath expressions
1084                 $single_page_url = null;
1085                 foreach ($splink as $pattern) {
1086                         $elems = @$xpath->evaluate($pattern, $readability->dom);
1087                         if (is_string($elems)) {
1088                                 $single_page_url = trim($elems);
1089                                 break;
1090                         } elseif ($elems instanceof DOMNodeList && $elems->length > 0) {
1091                                 foreach ($elems as $item) {
1092                                         if ($item instanceof DOMElement && $item->hasAttribute('href')) {
1093                                                 $single_page_url = $item->getAttribute('href');
1094                                                 break 2;
1095                                         } elseif ($item instanceof DOMAttr && $item->value) {
1096                                                 $single_page_url = $item->value;
1097                                                 break 2;
1098                                         }
1099                                 }
1100                         }
1101                 }
1102                 // If we've got URL, resolve against $url
1103                 if (isset($single_page_url) && ($single_page_url = makeAbsoluteStr($url, $single_page_url))) {
1104                         // check it's not what we have already!
1105                         if ($single_page_url != $url) {
1106                                 // it's not, so let's try to fetch it...
1107                                 $_prev_ref = $http->referer;
1108                                 $http->referer = $single_page_url;
1109                                 if (($response = $http->get($single_page_url, true)) && $response['status_code'] < 300) {
1110                                         $http->referer = $_prev_ref;
1111                                         return $response;
1112                                 }
1113                                 $http->referer = $_prev_ref;
1114                         }
1115                 }
1116         }
1117         return false;
1118 }
1119
1120 // based on content-type http header, decide what to do
1121 // param: HTTP headers string
1122 // return: array with keys: 'mime', 'type', 'subtype', 'action', 'name'
1123 // e.g. array('mime'=>'image/jpeg', 'type'=>'image', 'subtype'=>'jpeg', 'action'=>'link', 'name'=>'Image')
1124 function get_mime_action_info($headers) {
1125         global $options;
1126         // check if action defined for returned Content-Type
1127         $info = array();
1128         if (preg_match('!^Content-Type:\s*(([-\w]+)/([-\w\+]+))!im', $headers, $match)) {
1129                 // look for full mime type (e.g. image/jpeg) or just type (e.g. image)
1130                 // match[1] = full mime type, e.g. image/jpeg
1131                 // match[2] = first part, e.g. image
1132                 // match[3] = last part, e.g. jpeg
1133                 $info['mime'] = strtolower(trim($match[1]));
1134                 $info['type'] = strtolower(trim($match[2]));
1135                 $info['subtype'] = strtolower(trim($match[3]));
1136                 foreach (array($info['mime'], $info['type']) as $_mime) {
1137                         if (isset($options->content_type_exc[$_mime])) {
1138                                 $info['action'] = $options->content_type_exc[$_mime]['action'];
1139                                 $info['name'] = $options->content_type_exc[$_mime]['name'];
1140                                 break;
1141                         }
1142                 }
1143         }
1144         return $info;
1145 }
1146
1147 function remove_url_cruft($url) {
1148         // remove google analytics for the time being
1149         // regex adapted from http://navitronic.co.uk/2010/12/removing-google-analytics-cruft-from-urls/
1150         // https://gist.github.com/758177
1151         return preg_replace('/(\?|\&)utm_[a-z]+=[^\&]+/', '', $url);
1152 }
1153
1154 function make_substitutions($string) {
1155         if ($string == '') return $string;
1156         global $item, $effective_url;
1157         $string = str_replace('{url}', htmlspecialchars($item->get_permalink()), $string);
1158         $string = str_replace('{effective-url}', htmlspecialchars($effective_url), $string);
1159         return $string;
1160 }
1161
1162 function get_cache() {
1163         global $options, $valid_key;
1164         static $cache = null;
1165         if ($cache === null) {
1166                 $frontendOptions = array(
1167                         'lifetime' => 10*60, // cache lifetime of 10 minutes
1168                         'automatic_serialization' => false,
1169                         'write_control' => false,
1170                         'automatic_cleaning_factor' => $options->cache_cleanup,
1171                         'ignore_user_abort' => false
1172                 );
1173                 $backendOptions = array(
1174                         'cache_dir' => ($valid_key) ? $options->cache_dir.'/rss-with-key/' : $options->cache_dir.'/rss/', // directory where to put the cache files
1175                         'file_locking' => false,
1176                         'read_control' => true,
1177                         'read_control_type' => 'strlen',
1178                         'hashed_directory_level' => $options->cache_directory_level,
1179                         'hashed_directory_perm' => 0777,
1180                         'cache_file_perm' => 0664,
1181                         'file_name_prefix' => 'ff'
1182                 );
1183                 // getting a Zend_Cache_Core object
1184                 $cache = Zend_Cache::factory('Core', 'File', $frontendOptions, $backendOptions);
1185         }
1186         return $cache;
1187 }
1188
1189 function debug($msg) {
1190         global $debug_mode;
1191         if ($debug_mode) {
1192                 echo '* ',$msg,"\n";
1193                 ob_flush();
1194                 flush();
1195         }
1196 }