* * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ require_once 'XML/Serializer.php'; date_default_timezone_set('UTC'); class Tweeper { private static $USER_AGENT = "Mozilla/5.0 (Windows NT 6.1; rv:22.0) Gecko/20130405 Firefox/22.0"; public function __construct($generate_enclosure = FALSE) { $this->generate_enclosure = $generate_enclosure; } public static function epoch_to_gmdate($timestamp) { return gmdate('D, d M Y H:i:s', $timestamp) . ' GMT'; } public static function str_to_gmdate($date) { $timestamp = strtotime($date); return Tweeper::epoch_to_gmdate($timestamp); } private static function get_contents($url) { $ch = curl_init($url); curl_setopt_array($ch, array( CURLOPT_HEADER => FALSE, CURLOPT_FOLLOWLOCATION => TRUE, // follow http redirects to get the real URL CURLOPT_RETURNTRANSFER => TRUE, CURLOPT_SSL_VERIFYHOST => FALSE, CURLOPT_SSL_VERIFYPEER => FALSE, CURLOPT_HTTPHEADER => array('Accept-language: en'), CURLOPT_USERAGENT => Tweeper::$USER_AGENT, )); $contents = curl_exec($ch); curl_close($ch); return $contents; } private static function get_info($url) { $ch = curl_init($url); curl_setopt_array($ch, array( CURLOPT_HEADER => TRUE, CURLOPT_NOBODY => TRUE, CURLOPT_FOLLOWLOCATION => TRUE, // follow http redirects to get the real URL CURLOPT_RETURNTRANSFER => TRUE, CURLOPT_SSL_VERIFYHOST => FALSE, CURLOPT_SSL_VERIFYPEER => FALSE, CURLOPT_USERAGENT => Tweeper::$USER_AGENT, )); curl_exec($ch); $url_info = curl_getinfo($ch); curl_close($ch); return $url_info; } public static function generate_enclosure($url) { $supported_content_types = array( "application/ogg", "audio/aac", "audio/mp4", "audio/mpeg", "audio/ogg", "audio/vorbis", "audio/wav", "audio/webm", "audio/x-midi", "image/gif", "image/jpeg", "video/avi", "video/mp4", "video/mpeg", "video/ogg", ); // The RSS specification says that the enclosure element url must be http. // See http://sourceforge.net/p/feedvalidator/bugs/72/ $http_url = preg_replace("/^https/", "http", $url); $url_info = Tweeper::get_info($http_url); $supported = in_array($url_info['content_type'], $supported_content_types); if (!$supported) { error_log("Unsupported enclosure content type \"" . $url_info['content_type'] . "\" for URL: " . $url_info['url']); return ''; } $dom = new DomDocument(); $enc = $dom->createElement('enclosure'); $enc->setAttribute('url', $url_info['url']); $enc->setAttribute('length', $url_info['download_content_length']); $enc->setAttribute('type', $url_info['content_type']); $dom->appendChild($enc); return $dom->saveXML($enc); } /* Mimic the message from libxml.c::php_libxml_ctx_error_level() */ private function log_xml_error($error) { $output = ""; switch ($error->level) { case LIBXML_ERR_WARNING: $output .= "Warning $error->code: "; break; case LIBXML_ERR_ERROR: $output .= "Error $error->code: "; break; case LIBXML_ERR_FATAL: $output .= "Fatal Error $error->code: "; break; } $output .= trim($error->message); if ($error->file) { $output .= " in $error->file"; } else { $output .= " in Entity,"; } $output .=" line $error->line"; error_log($output); } private function load_stylesheet($host) { $stylesheet = "file://" . __DIR__ . "/rss_converter_" . $host . ".xsl"; if (FALSE === file_exists($stylesheet)) { trigger_error("Conversion to RSS not supported: $host", E_USER_ERROR); return NULL; } $stylesheet_contents = $this->get_contents($stylesheet); $xslDoc = new DOMDocument(); $xslDoc->loadXML($stylesheet_contents); $xsltProcessor = new XSLTProcessor(); $xsltProcessor->registerPHPFunctions(); $xsltProcessor->setParameter('', 'generateEnclosure', $this->generate_enclosure); $xsltProcessor->importStylesheet($xslDoc); return $xsltProcessor; } private function json_to_xml($html, $json_match_expr, $rootName) { // pre-process, convert json to XML $ret = preg_match($json_match_expr, $html, $matches); if ($ret !== 1) { trigger_error("Cannot match expression: $json_match_expr\n", E_USER_ERROR); return NULL; } $data = json_decode($matches[1]); if (!$data) { return NULL; } $serializer_options = array ( 'addDecl' => TRUE, 'encoding' => "UTF-8", 'indent' => ' ', 'rootName' => $rootName, ); $serializer = new XML_Serializer($serializer_options); $status = $serializer->serialize($data); if (PEAR::isError($status)) { trigger_error($status->getMessage(), E_USER_ERROR); return NULL; } return $serializer->getSerializedData(); } private function get_xml_instagram_com($html) { return $this->json_to_xml($html, '/window._sharedData = (.*);/', 'instagram'); } private function html_to_xml($html, $host) { $xmlDoc = new DOMDocument(); // Handle warnings and errors when loading invalid HTML. $xml_errors_value = libxml_use_internal_errors(true); // If there is a host-specific method to get the xml data, use it! $get_xml_host_method = 'get_xml_' . str_replace(".", "_", $host); if (method_exists($this, $get_xml_host_method)) { $xml_data = call_user_func_array(array($this, $get_xml_host_method), array($html)); $xmlDoc->loadXML($xml_data); } else { $xmlDoc->loadHTML($html); } foreach (libxml_get_errors() as $xml_error) { $this->log_xml_error($xml_error); } libxml_clear_errors(); libxml_use_internal_errors($xml_errors_value); return $xmlDoc; } public function tweep($src_url) { $url = parse_url($src_url); if (FALSE === $url || empty($url["host"])) { trigger_error("Invalid url: $src_url", E_USER_ERROR); return NULL; } $xsltProcessor = $this->load_stylesheet($url["host"]); if (NULL === $xsltProcessor) { return NULL; } $html = $this->get_contents($src_url); if (FALSE === $html) { return NULL; } $xmlDoc = $this->html_to_xml($html, $url["host"]); if (NULL === $xmlDoc) { return NULL; } $output = $xsltProcessor->transformToXML($xmlDoc); if (FALSE === $output) { trigger_error('XSL transformation failed.', E_USER_ERROR); return NULL; } return $output; } } function is_cli() { return (substr(php_sapi_name(), 0, 3) == 'cli'); } function usage($argv) { if (is_cli()) { $usage = "{$argv[0]} [-e|-h|--help] \n"; } else { $usage = htmlentities("{$_SERVER['SCRIPT_NAME']}?src_url=&generate_enclosure=<0|1>"); } return "usage: $usage"; } function parse_options_cli($argv, $argc) { $options = array( 'generate_enclosure' => FALSE ); if ($argc < 2) return $options; $cli_options = getopt("eh", array("help")); foreach ($cli_options as $opt => $val) { switch ($opt) { case 'e': $options['generate_enclosure'] = TRUE; break; case 'h': case 'help': echo usage($argv); exit(0); default: fwrite(STDERR, usage($argv)); exit(1); } } $options['src_url'] = $argv[count($cli_options) + 1]; return $options; } function parse_options_query_string() { $options = array( 'generate_enclosure' => FALSE ); if (isset($_GET['src_url'])) $options['src_url'] = $_GET['src_url']; if (isset($_GET['generate_enclosure'])) $options['generate_enclosure'] = $_GET['generate_enclosure'] == 1; return $options; } if (is_cli()) { $options = parse_options_cli($argv, $argc); $ERROR_STREAM = fopen('php://stderr', 'w'); } else { $options = parse_options_query_string(); $ERROR_STREAM = fopen('php://output', 'w'); } if (!isset($options['src_url'])) { fwrite($ERROR_STREAM, usage($argv)); exit(1); } $tweeper = new Tweeper($options['generate_enclosure']); echo $tweeper->tweep($options['src_url']);