X-Git-Url: https://git.ao2.it/tweeper.git/blobdiff_plain/84dc8897a796b91632cee1e0d736f811978022f6..57535fd5825c6c112b6489c27e469bc4143c1a2e:/tweeper.php diff --git a/tweeper.php b/tweeper.php index bed6350..ba8b1d7 100644 --- a/tweeper.php +++ b/tweeper.php @@ -1,6 +1,7 @@ * @@ -18,317 +19,60 @@ * along with this program. If not, see . */ -require_once 'Symfony/Component/Serializer/autoload.php'; +require_once 'src/Tweeper.php'; -use Symfony\Component\Serializer\Serializer; -use Symfony\Component\Serializer\Encoder\XmlEncoder; -use Symfony\Component\Serializer\Normalizer\ObjectNormalizer; +use Tweeper\Tweeper; 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) - { - if (!is_numeric($timestamp) || is_nan($timestamp)) { - $timestamp = 0; - } - - return gmdate('D, d M Y H:i:s', $timestamp) . ' GMT'; - } - - public static function str_to_gmdate($date) - { - $timestamp = strtotime($date); - if (FALSE === $timestamp) { - $timestamp = 0; - } - - return Tweeper::epoch_to_gmdate($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 for $host ($stylesheet not found)", 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; - } - - // Apparenty the ObjectNormalizer used afterwards is not able to handle - // the stdClass object created by json_decode() with the default setting - // $assoc = false; so use $assoc = true - $data = json_decode($matches[1], $assoc = true); - if (!$data) { - return NULL; - } - - $encoder = new XmlEncoder(); - $normalizer = new ObjectNormalizer(); - $serializer = new Serializer(array($normalizer), array($encoder)); - - $serializer_options = array ( - 'xml_encoding' => "UTF-8", - 'xml_format_output' => TRUE, - 'xml_root_node_name' => $rootName, - ); - - $xml_data = $serializer->serialize($data, 'xml', $serializer_options); - if (!$xml_data) { - trigger_error("Cannot serialize data", E_USER_ERROR); - return NULL; - } - - return $xml_data; - } - - private function get_xml_instagram_com($html) { - return $this->json_to_xml($html, '/window._sharedData = (.*);/', 'instagram'); - } - - private function preprocess_html_facebook_com($html) { - $html = str_replace('', '', $html); - return $html; - } - - private function html_to_xml($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; - } - - // Strip the leading www. to be more forgiving on input URLs - $host = preg_replace('/^www\./', '', $url["host"]); - - $xsltProcessor = $this->load_stylesheet($host); - if (NULL === $xsltProcessor) { - return NULL; - } - - $html = $this->get_contents($src_url); - if (FALSE === $html) { - return NULL; - } - - $preprocess_html_host_method = 'preprocess_html_' . str_replace(".", "_", $host); - if (method_exists($this, $preprocess_html_host_method)) { - $html = call_user_func_array(array($this, $preprocess_html_host_method), array($html)); - } - - $xmlDoc = $this->html_to_xml($html, $host); - if (NULL === $xmlDoc) { - return NULL; - } - - $output = $xsltProcessor->transformToXML($xmlDoc); - - if (FALSE === $output) { - trigger_error('XSL transformation failed.', E_USER_ERROR); - return NULL; - } - return $output; - } -} - -function is_cli() -{ +/** + * Check if the script is being run from the command line. + */ +function is_cli() { return (php_sapi_name() === "cli"); } -function usage($argv) -{ +/** + * Show the script usage. + */ +function usage($argv) { if (is_cli()) { $usage = "{$argv[0]} [-e|-h|--help] \n"; - } else { + } + else { $usage = htmlentities("{$_SERVER['SCRIPT_NAME']}?src_url=&generate_enclosure=<0|1>"); } return "usage: $usage"; } -function parse_options_cli($argv, $argc) -{ +/** + * Parse command line options. + */ +function parse_options_cli($argv, $argc) { $options = array( - 'generate_enclosure' => FALSE + 'generate_enclosure' => FALSE, ); - if ($argc < 2) + 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); + case 'e': + $options['generate_enclosure'] = TRUE; + break; + + case 'h': + case 'help': + echo usage($argv); + exit(0); + + default: + fwrite(STDERR, usage($argv)); + exit(1); } } @@ -337,34 +81,42 @@ function parse_options_cli($argv, $argc) return $options; } -function parse_options_query_string() -{ +/** + * Parse options passed from a query string. + */ +function parse_options_query_string() { $options = array( - 'generate_enclosure' => FALSE + 'generate_enclosure' => FALSE, ); - if (isset($_GET['src_url'])) + if (isset($_GET['src_url'])) { $options['src_url'] = $_GET['src_url']; + } - if (isset($_GET['generate_enclosure'])) + 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 { + $error_stream = fopen('php://stderr', 'w'); +} +else { $options = parse_options_query_string(); - $ERROR_STREAM = fopen('php://output', 'w'); + $error_stream = fopen('php://output', 'w'); } if (!isset($options['src_url'])) { - fwrite($ERROR_STREAM, usage(is_cli() ? $argv : NULL)); + fwrite($error_stream, usage(is_cli() ? $argv : NULL)); exit(1); } $tweeper = new Tweeper($options['generate_enclosure']); -echo $tweeper->tweep($options['src_url']); +$output = $tweeper->tweep($options['src_url']); +if (is_null($output)) { + exit(1); +} +echo $output;