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($process);
  54 }
  55
  56 // set include path
  57 set_include_path(realpath(dirname(__FILE__).'/libraries').PATH_SEPARATOR.get_include_path());
  58
  59 require_once dirname(__FILE__).'/makefulltextfeedHelpers.php';
  60
  61 ////////////////////////////////
  62 // Load config file
  63 ////////////////////////////////
  64 require dirname(__FILE__).'/config.php';
  65
  66 ////////////////////////////////
  67 // Prevent indexing/following by search engines because:
  68 // 1. The content is already public and presumably indexed (why create duplicates?)
  69 // 2. Not doing so might increase number of requests from search engines, thus increasing server load
  70 // Note: feed readers and services such as Yahoo Pipes will not be affected by this header.
  71 // Note: Using Disallow in a robots.txt file will be more effective (search engines will check
  72 // that before even requesting makefulltextfeed.php).
  73 ////////////////////////////////
  74 header('X-Robots-Tag: noindex, nofollow');
  75
  76 ////////////////////////////////
  77 // Check if service is enabled
  78 ////////////////////////////////
  79 if (!$options->enabled) {
  80         die('The full-text RSS service is currently disabled');
  81 }
  82
  83 ////////////////////////////////
  84 // Debug mode?
  85 // See the config file for debug options.
  86 ////////////////////////////////
  87 $debug_mode = false;
  88 if (isset($_GET['debug'])) {
  89         if ($options->debug === true || $options->debug == 'user') {
  90                 $debug_mode = true;
  91         } elseif ($options->debug == 'admin') {
  92                 session_start();
  93                 $debug_mode = (@$_SESSION['auth'] == 1);
  94         }
  95         if ($debug_mode) {
  96                 header('Content-Type: text/plain; charset=utf-8');
  97         } else {
  98                 if ($options->debug == 'admin') {
  99                         die('You must be logged in to the <a href="admin/">admin area</a> to see debug output.');
 100                 } else {
 101                         die('Debugging is disabled.');
 102                 }
 103         }
 104 }
 105
 106 ////////////////////////////////
 107 // Check for APC
 108 ////////////////////////////////
 109 $options->apc = $options->apc && function_exists('apc_add');
 110 if ($options->apc) {
 111         debug('APC is enabled and available on server');
 112 } else {
 113         debug('APC is disabled or not available on server');
 114 }
 115
 116 ////////////////////////////////
 117 // Check for smart cache
 118 ////////////////////////////////
 119 $options->smart_cache = $options->smart_cache && function_exists('apc_inc');
 120
 121 ////////////////////////////////
 122 // Check for feed URL
 123 ////////////////////////////////
 124 if (!isset($_GET['url'])) {
 125         die('No URL supplied');
 126 }
 127 $url = trim($_GET['url']);
 128 if (strtolower(substr($url, 0, 7)) == 'feed://') {
 129         $url = 'http://'.substr($url, 7);
 130 }
 131 if (!preg_match('!^https?://.+!i', $url)) {
 132         $url = 'http://'.$url;
 133 }
 134
 135 $url = filter_var($url, FILTER_SANITIZE_URL);
 136 $test = filter_var($url, FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED);
 137 // deal with bug http://bugs.php.net/51192 (present in PHP 5.2.13 and PHP 5.3.2)
 138 if ($test === false) {
 139         $test = filter_var(strtr($url, '-', '_'), FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED);
 140 }
 141 if ($test !== false && $test !== null && preg_match('!^https?://!', $url)) {
 142         // all okay
 143         unset($test);
 144 } else {
 145         die('Invalid URL supplied');
 146 }
 147 debug("Supplied URL: $url");
 148
 149 /////////////////////////////////
 150 // Redirect to hide API key
 151 /////////////////////////////////
 152 if (isset($_GET['key']) && ($key_index = array_search($_GET['key'], $options->api_keys)) !== false) {
 153         $host = $_SERVER['HTTP_HOST'];
 154         $path = rtrim(dirname($_SERVER['SCRIPT_NAME']), '/\\');
 155         $_qs_url = (strtolower(substr($url, 0, 7)) == 'http://') ? substr($url, 7) : $url;
 156         $redirect = 'http://'.htmlspecialchars($host.$path).'/makefulltextfeed.php?url='.urlencode($_qs_url);
 157         $redirect .= '&key='.$key_index;
 158         $redirect .= '&hash='.urlencode(sha1($_GET['key'].$url));
 159         if (isset($_GET['html'])) $redirect .= '&html='.urlencode($_GET['html']);
 160         if (isset($_GET['max'])) $redirect .= '&max='.(int)$_GET['max'];
 161         if (isset($_GET['links'])) $redirect .= '&links='.urlencode($_GET['links']);
 162         if (isset($_GET['exc'])) $redirect .= '&exc='.urlencode($_GET['exc']);
 163         if (isset($_GET['format'])) $redirect .= '&format='.urlencode($_GET['format']);
 164         if (isset($_GET['callback'])) $redirect .= '&callback='.urlencode($_GET['callback']);
 165         if (isset($_GET['l'])) $redirect .= '&l='.urlencode($_GET['l']);
 166         if (isset($_GET['xss'])) $redirect .= '&xss';
 167         if (isset($_GET['use_extracted_title'])) $redirect .= '&use_extracted_title';
 168         if (isset($_GET['debug'])) $redirect .= '&debug';
 169         if ($debug_mode) {
 170                 debug('Redirecting to hide access key, follow URL below to continue');
 171                 debug("Location: $redirect");
 172         } else {
 173                 header("Location: $redirect");
 174         }
 175         exit;
 176 }
 177
 178 ///////////////////////////////////////////////
 179 // Set timezone.
 180 // Prevents warnings, but needs more testing -
 181 // perhaps if timezone is set in php.ini we
 182 // don't need to set it at all...
 183 ///////////////////////////////////////////////
 184 if (!ini_get('date.timezone') || !@date_default_timezone_set(ini_get('date.timezone'))) {
 185         date_default_timezone_set('UTC');
 186 }
 187
 188 ///////////////////////////////////////////////
 189 // Check if the request is explicitly for an HTML page
 190 ///////////////////////////////////////////////
 191 $html_only = (isset($_GET['html']) && ($_GET['html'] == '1' || $_GET['html'] == 'true'));
 192
 193 ///////////////////////////////////////////////
 194 // Check if valid key supplied
 195 ///////////////////////////////////////////////
 196 $valid_key = false;
 197 if (isset($_GET['key']) && isset($_GET['hash']) && isset($options->api_keys[(int)$_GET['key']])) {
 198         $valid_key = ($_GET['hash'] == sha1($options->api_keys[(int)$_GET['key']].$url));
 199 }
 200 $key_index = ($valid_key) ? (int)$_GET['key'] : 0;
 201 if (!$valid_key && $options->key_required) {
 202         die('A valid key must be supplied');
 203 }
 204 if (!$valid_key && isset($_GET['key']) && $_GET['key'] != '') {
 205         die('The entered key is invalid');
 206 }
 207
 208 if (file_exists('custom_init.php')) require 'custom_init.php';
 209
 210 ///////////////////////////////////////////////
 211 // Check URL against list of blacklisted URLs
 212 ///////////////////////////////////////////////
 213 if (!url_allowed($url)) die('URL blocked');
 214
 215 ///////////////////////////////////////////////
 216 // Max entries
 217 // see config.php to find these values
 218 ///////////////////////////////////////////////
 219 if (isset($_GET['max'])) {
 220         $max = (int)$_GET['max'];
 221         if ($valid_key) {
 222                 $max = min($max, $options->max_entries_with_key);
 223         } else {
 224                 $max = min($max, $options->max_entries);
 225         }
 226 } else {
 227         if ($valid_key) {
 228                 $max = $options->default_entries_with_key;
 229         } else {
 230                 $max = $options->default_entries;
 231         }
 232 }
 233
 234 ///////////////////////////////////////////////
 235 // Link handling
 236 ///////////////////////////////////////////////
 237 if (isset($_GET['links']) && in_array($_GET['links'], array('preserve', 'footnotes', 'remove'))) {
 238         $links = $_GET['links'];
 239 } else {
 240         $links = 'preserve';
 241 }
 242
 243 ///////////////////////////////////////////////
 244 // Favour item titles in feed?
 245 ///////////////////////////////////////////////
 246 $favour_feed_titles = true;
 247 if ($options->favour_feed_titles == 'user') {
 248         $favour_feed_titles = !isset($_GET['use_extracted_title']);
 249 } else {
 250         $favour_feed_titles = $options->favour_feed_titles;
 251 }
 252
 253 ///////////////////////////////////////////////
 254 // Exclude items if extraction fails
 255 ///////////////////////////////////////////////
 256 if ($options->exclude_items_on_fail === 'user') {
 257         $exclude_on_fail = (isset($_GET['exc']) && ($_GET['exc'] == '1'));
 258 } else {
 259         $exclude_on_fail = $options->exclude_items_on_fail;
 260 }
 261
 262 ///////////////////////////////////////////////
 263 // Detect language
 264 ///////////////////////////////////////////////
 265 if ($options->detect_language === 'user') {
 266         if (isset($_GET['l'])) {
 267                 $detect_language = (int)$_GET['l'];
 268         } else {
 269                 $detect_language = 1;
 270         }
 271 } else {
 272         $detect_language = $options->detect_language;
 273 }
 274
 275 if ($detect_language >= 2) {
 276         $language_codes = array('albanian' => 'sq','arabic' => 'ar','azeri' => 'az','bengali' => 'bn','bulgarian' => 'bg',
 277         'cebuano' => 'ceb', // ISO 639-2
 278         'croatian' => 'hr','czech' => 'cs','danish' => 'da','dutch' => 'nl','english' => 'en','estonian' => 'et','farsi' => 'fa','finnish' => 'fi','french' => 'fr','german' => 'de','hausa' => 'ha',
 279         'hawaiian' => 'haw', // ISO 639-2
 280         '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',
 281         'pidgin' => 'cpe', // ISO 639-2
 282         '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');
 283 }
 284 $use_cld = extension_loaded('cld') && (version_compare(PHP_VERSION, '5.3.0') >= 0);
 285
 286 /////////////////////////////////////
 287 // Check for valid format
 288 // (stick to RSS (or RSS as JSON) for the time being)
 289 /////////////////////////////////////
 290 if (isset($_GET['format']) && $_GET['format'] == 'json') {
 291         $format = 'json';
 292 } else {
 293         $format = 'rss';
 294 }
 295
 296 /////////////////////////////////////
 297 // Should we do XSS filtering?
 298 /////////////////////////////////////
 299 if ($options->xss_filter === 'user') {
 300         $xss_filter = isset($_GET['xss']);
 301 } else {
 302         $xss_filter = $options->xss_filter;
 303 }
 304 if (!$xss_filter && isset($_GET['xss'])) {
 305         die('XSS filtering is disabled in config');
 306 }
 307
 308 /////////////////////////////////////
 309 // Check for JSONP
 310 // Regex from https://gist.github.com/1217080
 311 /////////////////////////////////////
 312 $callback = null;
 313 if ($format =='json' && isset($_GET['callback'])) {
 314         $callback = trim($_GET['callback']);
 315         foreach (explode('.', $callback) as $_identifier) {
 316                 if (!preg_match('/^[a-zA-Z_$][0-9a-zA-Z_$]*(?:\[(?:".+"|\'.+\'|\d+)\])*?$/', $_identifier)) {
 317                         die('Invalid JSONP callback');
 318                 }
 319         }
 320         debug("JSONP callback: $callback");
 321 }
 322
 323 //////////////////////////////////
 324 // Enable Cross-Origin Resource Sharing (CORS)
 325 //////////////////////////////////
 326 if ($options->cors) header('Access-Control-Allow-Origin: *');
 327
 328 //////////////////////////////////
 329 // Check for cached copy
 330 //////////////////////////////////
 331 if ($options->caching) {
 332         debug('Caching is enabled...');
 333         $cache_id = md5($max.$url.$valid_key.$links.$favour_feed_titles.$xss_filter.$exclude_on_fail.$format.$detect_language.(int)isset($_GET['pubsub']));
 334         $check_cache = true;
 335         if ($options->apc && $options->smart_cache) {
 336                 apc_add("cache.$cache_id", 0, 10*60);
 337                 $apc_cache_hits = (int)apc_fetch("cache.$cache_id");
 338                 $check_cache = ($apc_cache_hits >= 2);
 339                 apc_inc("cache.$cache_id");
 340                 if ($check_cache) {
 341                         debug('Cache key found in APC, we\'ll try to load cache file from disk');
 342                 } else {
 343                         debug('Cache key not found in APC');
 344                 }
 345         }
 346         if ($check_cache) {
 347                 $cache = get_cache();
 348                 if ($data = $cache->load($cache_id)) {
 349                         if ($debug_mode) {
 350                                 debug('Loaded cached copy');
 351                                 exit;
 352                         }
 353                         if ($format == 'json') {
 354                                 if ($callback === null) {
 355                                         header('Content-type: application/json; charset=UTF-8');
 356                                 } else {
 357                                         header('Content-type: application/javascript; charset=UTF-8');
 358                                 }
 359                         } else {
 360                                 header('Content-type: text/xml; charset=UTF-8');
 361                                 header('X-content-type-options: nosniff');
 362                         }
 363                         if (headers_sent()) die('Some data has already been output, can\'t send RSS file');
 364                         if ($callback) {
 365                                 echo "$callback($data);";
 366                         } else {
 367                                 echo $data;
 368                         }
 369                         exit;
 370                 }
 371         }
 372 }
 373
 374 //////////////////////////////////
 375 // Set Expires header
 376 //////////////////////////////////
 377 if (!$debug_mode) {
 378         header('Expires: ' . gmdate('D, d M Y H:i:s', time()+(60*10)) . ' GMT');
 379 }
 380
 381 //////////////////////////////////
 382 // Set up HTTP agent
 383 //////////////////////////////////
 384 global $http;
 385 $http = new HumbleHttpAgent();
 386 $http->debug = $debug_mode;
 387 $http->userAgentMap = $options->user_agents;
 388 $http->headerOnlyTypes = array_keys($options->content_type_exc);
 389 $http->rewriteUrls = $options->rewrite_url;
 390
 391 //////////////////////////////////
 392 // Set up Content Extractor
 393 //////////////////////////////////
 394 global $extractor;
 395 $extractor = new ContentExtractor(dirname(__FILE__).'/site_config/custom', dirname(__FILE__).'/site_config/standard');
 396 $extractor->debug = $debug_mode;
 397 SiteConfig::$debug = $debug_mode;
 398 SiteConfig::use_apc($options->apc);
 399 $extractor->fingerprints = $options->fingerprints;
 400 $extractor->allowedParsers = $options->allowed_parsers;
 401
 402 ////////////////////////////////
 403 // Get RSS/Atom feed
 404 ////////////////////////////////
 405 if (!$html_only) {
 406         debug('--------');
 407         debug("Attempting to process URL as feed");
 408         // Send user agent header showing PHP (prevents a HTML response from feedburner)
 409         $http->userAgentDefault = HumbleHttpAgent::UA_PHP;
 410         // configure SimplePie HTTP extension class to use our HumbleHttpAgent instance
 411         SimplePie_HumbleHttpAgent::set_agent($http);
 412         $feed = new SimplePie();
 413         // some feeds use the text/html content type - force_feed tells SimplePie to process anyway
 414         $feed->force_feed(true);
 415         $feed->set_file_class('SimplePie_HumbleHttpAgent');
 416         //$feed->set_feed_url($url); // colons appearing in the URL's path get encoded
 417         $feed->feed_url = $url;
 418         $feed->set_autodiscovery_level(SIMPLEPIE_LOCATOR_NONE);
 419         $feed->set_timeout(20);
 420         $feed->enable_cache(false);
 421         $feed->set_stupidly_fast(true);
 422         $feed->enable_order_by_date(false); // we don't want to do anything to the feed
 423         $feed->set_url_replacements(array());
 424         // initialise the feed
 425         // the @ suppresses notices which on some servers causes a 500 internal server error
 426         $result = @$feed->init();
 427         //$feed->handle_content_type();
 428         //$feed->get_title();
 429         if ($result && (!is_array($feed->data) || count($feed->data) == 0)) {
 430                 die('Sorry, no feed items found');
 431         }
 432         // from now on, we'll identify ourselves as a browser
 433         $http->userAgentDefault = HumbleHttpAgent::UA_BROWSER;
 434 }
 435
 436 ////////////////////////////////////////////////////////////////////////////////
 437 // Our given URL is not a feed, so let's create our own feed with a single item:
 438 // the given URL. This basically treats all non-feed URLs as if they were
 439 // single-item feeds.
 440 ////////////////////////////////////////////////////////////////////////////////
 441 $isDummyFeed = false;
 442 if ($html_only || !$result) {
 443         debug('--------');
 444         debug("Constructing a single-item feed from URL");
 445         $isDummyFeed = true;
 446         unset($feed, $result);
 447         // create single item dummy feed object
 448         $feed = new DummySingleItemFeed($url);
 449 }
 450
 451 ////////////////////////////////////////////
 452 // Create full-text feed
 453 ////////////////////////////////////////////
 454 $output = new FeedWriter();
 455 $output->setTitle(strip_tags($feed->get_title()));
 456 $output->setDescription(strip_tags($feed->get_description()));
 457 $output->setXsl('css/feed.xsl'); // Chrome uses this, most browsers ignore it
 458 if ($valid_key && isset($_GET['pubsub'])) { // used only on fivefilters.org at the moment
 459         $output->addHub('http://fivefilters.superfeedr.com/');
 460         $output->addHub('http://pubsubhubbub.appspot.com/');
 461         $output->setSelf('http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
 462 }
 463 $output->setLink($feed->get_link()); // Google Reader uses this for pulling in favicons
 464 if ($img_url = $feed->get_image_url()) {
 465         $output->setImage($feed->get_title(), $feed->get_link(), $img_url);
 466 }
 467
 468 ////////////////////////////////////////////
 469 // Loop through feed items
 470 ////////////////////////////////////////////
 471 $items = $feed->get_items(0, $max);
 472 // Request all feed items in parallel (if supported)
 473 $urls_sanitized = array();
 474 $urls = array();
 475 foreach ($items as $key => $item) {
 476         $permalink = htmlspecialchars_decode($item->get_permalink());
 477         // Colons in URL path segments get encoded by SimplePie, yet some sites expect them unencoded
 478         $permalink = str_replace('%3A', ':', $permalink);
 479         // validateUrl() strips non-ascii characters
 480         // simplepie already sanitizes URLs so let's not do it again here.
 481         //$permalink = $http->validateUrl($permalink);
 482         if ($permalink) {
 483                 $urls_sanitized[] = $permalink;
 484         }
 485         $urls[$key] = $permalink;
 486 }
 487 debug('--------');
 488 debug('Fetching feed items');
 489 $http->fetchAll($urls_sanitized);
 490 //$http->cacheAll();
 491
 492 // count number of items added to full feed
 493 $item_count = 0;
 494
 495 foreach ($items as $key => $item) {
 496         debug('--------');
 497         debug('Processing feed item '.($item_count+1));
 498         $do_content_extraction = true;
 499         $extract_result = false;
 500         $text_sample = null;
 501         $permalink = $urls[$key];
 502         debug("Item URL: $permalink");
 503         $extracted_title = '';
 504         $feed_item_title = $item->get_title();
 505         if ($feed_item_title !== null) {
 506                 $feed_item_title = strip_tags(htmlspecialchars_decode($feed_item_title));
 507         }
 508         $newitem = $output->createNewItem();
 509         $newitem->setTitle($feed_item_title);
 510         if ($valid_key && isset($_GET['pubsub'])) { // used only on fivefilters.org at the moment
 511                 if ($permalink !== false) {
 512                         $newitem->setLink('http://fivefilters.org/content-only/redirect.php?url='.urlencode($permalink));
 513                 } else {
 514                         $newitem->setLink('http://fivefilters.org/content-only/redirect.php?url='.urlencode($item->get_permalink()));
 515                 }
 516         } else {
 517                 if ($permalink !== false) {
 518                         $newitem->setLink($permalink);
 519                 } else {
 520                         $newitem->setLink($item->get_permalink());
 521                 }
 522         }
 523         //if ($permalink && ($response = $http->get($permalink, true)) && $response['status_code'] < 300) {
 524         // Allowing error codes - some sites return correct content with error status
 525         // e.g. prospectmagazine.co.uk returns 403
 526         if ($permalink && ($response = $http->get($permalink, true)) && ($response['status_code'] < 300 || $response['status_code'] > 400)) {
 527                 $effective_url = $response['effective_url'];
 528                 if (!url_allowed($effective_url)) continue;
 529                 // check if action defined for returned Content-Type
 530                 $mime_info = get_mime_action_info($response['headers']);
 531                 if (isset($mime_info['action'])) {
 532                         if ($mime_info['action'] == 'exclude') {
 533                                 continue; // skip this feed item entry
 534                         } elseif ($mime_info['action'] == 'link') {
 535                                 if ($mime_info['type'] == 'image') {
 536                                         $html = "<a href=\"$effective_url\"><img src=\"$effective_url\" alt=\"{$mime_info['name']}\" /></a>";
 537                                 } else {
 538                                         $html = "<a href=\"$effective_url\">Download {$mime_info['name']}</a>";
 539                                 }
 540                                 $extracted_title = $mime_info['name'];
 541                                 $do_content_extraction = false;
 542                         }
 543                 }
 544                 if ($do_content_extraction) {
 545                         $html = $response['body'];
 546                         // remove strange things
 547                         $html = str_replace('</[>', '', $html);
 548                         $html = convert_to_utf8($html, $response['headers']);
 549                         // check site config for single page URL - fetch it if found
 550                         $is_single_page = false;
 551                         if ($single_page_response = getSinglePage($item, $html, $effective_url)) {
 552                                 $is_single_page = true;
 553                                 $html = $single_page_response['body'];
 554                                 // remove strange things
 555                                 $html = str_replace('</[>', '', $html);
 556                                 $html = convert_to_utf8($html, $single_page_response['headers']);
 557                                 $effective_url = $single_page_response['effective_url'];
 558                                 debug("Retrieved single-page view from $effective_url");
 559                                 unset($single_page_response);
 560                         }
 561                         debug('--------');
 562                         debug('Attempting to extract content');
 563                         $extract_result = $extractor->process($html, $effective_url);
 564                         $readability = $extractor->readability;
 565                         $content_block = ($extract_result) ? $extractor->getContent() : null;
 566                         $extracted_title = ($extract_result) ? $extractor->getTitle() : '';
 567                         // Deal with multi-page articles
 568                         //die('Next: '.$extractor->getNextPageUrl());
 569                         $is_multi_page = (!$is_single_page && $extract_result && $extractor->getNextPageUrl());
 570                         if ($options->multipage && $is_multi_page) {
 571                                 debug('--------');
 572                                 debug('Attempting to process multi-page article');
 573                                 $multi_page_urls = array();
 574                                 $multi_page_content = array();
 575                                 while ($next_page_url = $extractor->getNextPageUrl()) {
 576                                         debug('--------');
 577                                         debug('Processing next page: '.$next_page_url);
 578                                         // If we've got URL, resolve against $url
 579                                         if ($next_page_url = makeAbsoluteStr($effective_url, $next_page_url)) {
 580                                                 // check it's not what we have already!
 581                                                 if (!in_array($next_page_url, $multi_page_urls)) {
 582                                                         // it's not, so let's attempt to fetch it
 583                                                         $multi_page_urls[] = $next_page_url;
 584                                                         $_prev_ref = $http->referer;
 585                                                         if (($response = $http->get($next_page_url, true)) && $response['status_code'] < 300) {
 586                                                                 // make sure mime type is not something with a different action associated
 587                                                                 $page_mime_info = get_mime_action_info($response['headers']);
 588                                                                 if (!isset($page_mime_info['action'])) {
 589                                                                         $html = $response['body'];
 590                                                                         // remove strange things
 591                                                                         $html = str_replace('</[>', '', $html);
 592                                                                         $html = convert_to_utf8($html, $response['headers']);
 593                                                                         if ($extractor->process($html, $next_page_url)) {
 594                                                                                 $multi_page_content[] = $extractor->getContent();
 595                                                                                 continue;
 596                                                                         } else { debug('Failed to extract content'); }
 597                                                                 } else { debug('MIME type requires different action'); }
 598                                                         } else { debug('Failed to fetch URL'); }
 599                                                 } else { debug('URL already processed'); }
 600                                         } else { debug('Failed to resolve against '.$effective_url); }
 601                                         // failed to process next_page_url, so cancel further requests
 602                                         $multi_page_content = array();
 603                                         break;
 604                                 }
 605                                 // did we successfully deal with this multi-page article?
 606                                 if (empty($multi_page_content)) {
 607                                         debug('Failed to extract all parts of multi-page article, so not going to include them');
 608                                         $multi_page_content[] = $readability->dom->createElement('p')->innerHTML = '<em>This article appears to continue on subsequent pages which we could not extract</em>';
 609                                 }
 610                                 foreach ($multi_page_content as $_page) {
 611                                         $_page = $content_block->ownerDocument->importNode($_page, true);
 612                                         $content_block->appendChild($_page);
 613                                 }
 614                                 unset($multi_page_urls, $multi_page_content, $page_mime_info, $next_page_url);
 615                         }
 616                 }
 617                 // use extracted title for both feed and item title if we're using single-item dummy feed
 618                 if ($isDummyFeed) {
 619                         $output->setTitle($extracted_title);
 620                         $newitem->setTitle($extracted_title);
 621                 } else {
 622                         // use extracted title instead of feed item title?
 623                         if (!$favour_feed_titles && $extracted_title != '') {
 624                                 debug('Using extracted title in generated feed');
 625                                 $newitem->setTitle($extracted_title);
 626                         }
 627                 }
 628         }
 629         if ($do_content_extraction) {
 630                 // if we failed to extract content...
 631                 if (!$extract_result) {
 632                         if ($exclude_on_fail) {
 633                                 debug('Failed to extract, so skipping (due to exclude on fail parameter)');
 634                                 continue; // skip this and move to next item
 635                         }
 636                         //TODO: get text sample for language detection
 637                         $html = $options->error_message;
 638                         // keep the original item description
 639                         $html .= $item->get_description();
 640                 } else {
 641                         $readability->clean($content_block, 'select');
 642                         if ($options->rewrite_relative_urls) makeAbsolute($effective_url, $content_block);
 643                         // footnotes
 644                         if (($links == 'footnotes') && (strpos($effective_url, 'wikipedia.org') === false)) {
 645                                 $readability->addFootnotes($content_block);
 646                         }
 647                         // remove nesting: <div><div><div><p>test</p></div></div></div> = <p>test</p>
 648                         while ($content_block->childNodes->length == 1 && $content_block->firstChild->nodeType === XML_ELEMENT_NODE) {
 649                                 // only follow these tag names
 650                                 if (!in_array(strtolower($content_block->tagName), array('div', 'article', 'section', 'header', 'footer'))) break;
 651                                 //$html = $content_block->firstChild->innerHTML; // FTR 2.9.5
 652                                 $content_block = $content_block->firstChild;
 653                         }
 654                         // convert content block to HTML string
 655                         // Need to preserve things like body: //img[@id='feature']
 656                         if (in_array(strtolower($content_block->tagName), array('div', 'article', 'section', 'header', 'footer'))) {
 657                                 $html = $content_block->innerHTML;
 658                         } else {
 659                                 $html = $content_block->ownerDocument->saveXML($content_block); // essentially outerHTML
 660                         }
 661                         unset($content_block);
 662                         // post-processing cleanup
 663                         $html = preg_replace('!<p>[\s\h\v]*</p>!u', '', $html);
 664                         if ($links == 'remove') {
 665                                 $html = preg_replace('!</?a[^>]*>!', '', $html);
 666                         }
 667                         // get text sample for language detection
 668                         $text_sample = strip_tags(substr($html, 0, 500));
 669                         $html = make_substitutions($options->message_to_prepend).$html;
 670                         $html .= make_substitutions($options->message_to_append);
 671                 }
 672         }
 673
 674                 if ($valid_key && isset($_GET['pubsub'])) { // used only on fivefilters.org at the moment
 675                         $newitem->addElement('guid', 'http://fivefilters.org/content-only/redirect.php?url='.urlencode($item->get_permalink()), array('isPermaLink'=>'false'));
 676                 } else {
 677                         $newitem->addElement('guid', $item->get_permalink(), array('isPermaLink'=>'true'));
 678                 }
 679                 // filter xss?
 680                 if ($xss_filter) {
 681                         debug('Filtering HTML to remove XSS');
 682                         $html = htmLawed::hl($html, array('safe'=>1, 'deny_attribute'=>'style', 'comment'=>1, 'cdata'=>1));
 683                 }
 684                 $newitem->setDescription($html);
 685
 686                 // set date
 687                 if ((int)$item->get_date('U') > 0) {
 688                         $newitem->setDate((int)$item->get_date('U'));
 689                 } elseif ($extractor->getDate()) {
 690                         $newitem->setDate($extractor->getDate());
 691                 }
 692
 693                 // add authors
 694                 if ($authors = $item->get_authors()) {
 695                         foreach ($authors as $author) {
 696                                 // for some feeds, SimplePie stores author's name as email, e.g. http://feeds.feedburner.com/nymag/intel
 697                                 if ($author->get_name() !== null) {
 698                                         $newitem->addElement('dc:creator', $author->get_name());
 699                                 } elseif ($author->get_email() !== null) {
 700                                         $newitem->addElement('dc:creator', $author->get_email());
 701                                 }
 702                         }
 703                 } elseif ($authors = $extractor->getAuthors()) {
 704                         //TODO: make sure the list size is reasonable
 705                         foreach ($authors as $author) {
 706                                 // TODO: xpath often selects authors from other articles linked from the page.
 707                                 // for now choose first item
 708                                 $newitem->addElement('dc:creator', $author);
 709                                 break;
 710                         }
 711                 }
 712
 713                 // add language
 714                 if ($detect_language) {
 715                         $language = $extractor->getLanguage();
 716                         if (!$language) $language = $feed->get_language();
 717                         if (($detect_language == 3 || (!$language && $detect_language == 2)) && $text_sample) {
 718                                 try {
 719                                         if ($use_cld) {
 720                                                 // Use PHP-CLD extension
 721                                                 $php_cld = 'CLD\detect'; // in quotes to prevent PHP 5.2 parse error
 722                                                 $res = $php_cld($text_sample);
 723                                                 if (is_array($res) && count($res) > 0) {
 724                                                         $language = $res[0]['code'];
 725                                                 }
 726                                         } else {
 727                                                 //die('what');
 728                                                 // Use PEAR's Text_LanguageDetect
 729                                                 if (!isset($l)) {
 730                                                         $l = new Text_LanguageDetect('libraries/language-detect/lang.dat', 'libraries/language-detect/unicode_blocks.dat');
 731                                                 }
 732                                                 $l_result = $l->detect($text_sample, 1);
 733                                                 if (count($l_result) > 0) {
 734                                                         $language = $language_codes[key($l_result)];
 735                                                 }
 736                                         }
 737                                 } catch (Exception $e) {
 738                                         //die('error: '.$e);
 739                                         // do nothing
 740                                 }
 741                         }
 742                         if ($language && (strlen($language) < 7)) {
 743                                 $newitem->addElement('dc:language', $language);
 744                         }
 745                 }
 746
 747                 // add MIME type (if it appeared in our exclusions lists)
 748                 if (isset($mime_info['mime'])) $newitem->addElement('dc:format', $mime_info['mime']);
 749                 // add effective URL (URL after redirects)
 750                 if (isset($effective_url)) {
 751                         //TODO: ensure $effective_url is valid witout - sometimes it causes problems, e.g.
 752                         //http://www.siasat.pk/forum/showthread.php?108883-Pakistan-Chowk-by-Rana-Mubashir-�-25th-March-2012-Special-Program-from-Liari-(Karachi)
 753                         //temporary measure: use utf8_encode()
 754                         $newitem->addElement('dc:identifier', remove_url_cruft(utf8_encode($effective_url)));
 755                 } else {
 756                         $newitem->addElement('dc:identifier', remove_url_cruft($item->get_permalink()));
 757                 }
 758
 759                 // add categories
 760                 if ($categories = $item->get_categories()) {
 761                         foreach ($categories as $category) {
 762                                 if ($category->get_label() !== null) {
 763                                         $newitem->addElement('category', $category->get_label());
 764                                 }
 765                         }
 766                 }
 767
 768                 // check for enclosures
 769                 if ($options->keep_enclosures) {
 770                         if ($enclosures = $item->get_enclosures()) {
 771                                 foreach ($enclosures as $enclosure) {
 772                                         // thumbnails
 773                                         foreach ((array)$enclosure->get_thumbnails() as $thumbnail) {
 774                                                 $newitem->addElement('media:thumbnail', '', array('url'=>$thumbnail));
 775                                         }
 776                                         if (!$enclosure->get_link()) continue;
 777                                         $enc = array();
 778                                         // Media RSS spec ($enc): http://search.yahoo.com/mrss
 779                                         // SimplePie methods ($enclosure): http://simplepie.org/wiki/reference/start#methods4
 780                                         $enc['url'] = $enclosure->get_link();
 781                                         if ($enclosure->get_length()) $enc['fileSize'] = $enclosure->get_length();
 782                                         if ($enclosure->get_type()) $enc['type'] = $enclosure->get_type();
 783                                         if ($enclosure->get_medium()) $enc['medium'] = $enclosure->get_medium();
 784                                         if ($enclosure->get_expression()) $enc['expression'] = $enclosure->get_expression();
 785                                         if ($enclosure->get_bitrate()) $enc['bitrate'] = $enclosure->get_bitrate();
 786                                         if ($enclosure->get_framerate()) $enc['framerate'] = $enclosure->get_framerate();
 787                                         if ($enclosure->get_sampling_rate()) $enc['samplingrate'] = $enclosure->get_sampling_rate();
 788                                         if ($enclosure->get_channels()) $enc['channels'] = $enclosure->get_channels();
 789                                         if ($enclosure->get_duration()) $enc['duration'] = $enclosure->get_duration();
 790                                         if ($enclosure->get_height()) $enc['height'] = $enclosure->get_height();
 791                                         if ($enclosure->get_width()) $enc['width'] = $enclosure->get_width();
 792                                         if ($enclosure->get_language()) $enc['lang'] = $enclosure->get_language();
 793                                         $newitem->addElement('media:content', '', $enc);
 794                                 }
 795                         }
 796                 }
 797         /* } */
 798         $output->addItem($newitem);
 799         unset($html);
 800         $item_count++;
 801 }
 802
 803 // output feed
 804 debug('Done!');
 805 /*
 806 if ($debug_mode) {
 807         $_apc_data = apc_cache_info('user');
 808         var_dump($_apc_data); exit;
 809 }
 810 */
 811 if (!$debug_mode) {
 812         if ($callback) echo "$callback("; // if $callback is set, $format also == 'json'
 813         if ($format == 'json') $output->setFormat(($callback === null) ? JSON : JSONP);
 814         $add_to_cache = $options->caching;
 815         // is smart cache mode enabled?
 816         if ($add_to_cache && $options->apc && $options->smart_cache) {
 817                 // yes, so only cache if this is the second request for this URL
 818                 $add_to_cache = ($apc_cache_hits >= 2);
 819                 // purge cache
 820                 if ($options->cache_cleanup > 0) {
 821                         if (rand(1, $options->cache_cleanup) == 1) {
 822                                 // apc purge code adapted from from http://www.thimbleopensource.com/tutorials-snippets/php-apc-expunge-script
 823                                 $_apc_data = apc_cache_info('user');
 824                                 foreach ($_apc_data['cache_list'] as $_apc_item) {
 825                                   if ($_apc_item['ttl'] > 0 && ($_apc_item['ttl'] + $_apc_item['creation_time'] < time())) {
 826                                         apc_delete($_apc_item['info']);
 827                                   }
 828                                 }
 829                         }
 830                 }
 831         }
 832         if ($add_to_cache) {
 833                 ob_start();
 834                 $output->genarateFeed(false);
 835                 $output = ob_get_contents();
 836                 ob_end_clean();
 837                 if ($html_only && $item_count == 0) {
 838                         // do not cache - in case of temporary server glitch at source URL
 839                 } else {
 840                         $cache = get_cache();
 841                         if ($add_to_cache) $cache->save($output, $cache_id);
 842                 }
 843                 echo $output;
 844         } else {
 845                 $output->genarateFeed(false);
 846         }
 847         if ($callback) echo ');';
 848 }
 849