X-Git-Url: https://git.ao2.it/tweeper.git/blobdiff_plain/8c743376a7e7eab3714e5aa4300e34fa3dd89415..57535fd5825c6c112b6489c27e469bc4143c1a2e:/tweeper.php?ds=inline diff --git a/tweeper.php b/tweeper.php index f1a4ba9..ba8b1d7 100644 --- a/tweeper.php +++ b/tweeper.php @@ -19,324 +19,13 @@ * 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'); /** - * Scrape supported websites and perform conversion to RSS. - */ -class Tweeper { - - private static $userAgent = "Mozilla/5.0 (Windows NT 6.1; rv:22.0) Gecko/20130405 Firefox/22.0"; - - /** - * Constructor sets up {@link $generate_enclosure}. - */ - public function __construct($generate_enclosure = FALSE) { - $this->generate_enclosure = $generate_enclosure; - } - - /** - * Convert numeric Epoch to the date format expected in a RSS document. - */ - public static function epochToRssDate($timestamp) { - if (!is_numeric($timestamp) || is_nan($timestamp)) { - $timestamp = 0; - } - - return gmdate(DATE_RSS, $timestamp); - } - - /** - * Convert generic date string to the date format expected in a RSS document. - */ - public static function strToRssDate($date) { - $timestamp = strtotime($date); - if (FALSE === $timestamp) { - $timestamp = 0; - } - - return Tweeper::epochToRssDate($timestamp); - } - - /** - * Get the contents from a URL. - */ - private static function getUrlContents($url) { - $ch = curl_init($url); - curl_setopt_array($ch, array( - CURLOPT_HEADER => FALSE, - // Follow http redirects to get the real URL. - CURLOPT_FOLLOWLOCATION => TRUE, - CURLOPT_RETURNTRANSFER => TRUE, - CURLOPT_SSL_VERIFYHOST => FALSE, - CURLOPT_SSL_VERIFYPEER => FALSE, - CURLOPT_HTTPHEADER => array('Accept-language: en'), - CURLOPT_USERAGENT => Tweeper::$userAgent, - )); - $contents = curl_exec($ch); - curl_close($ch); - - return $contents; - } - - /** - * Get the headers from a URL. - */ - private static function getUrlInfo($url) { - $ch = curl_init($url); - curl_setopt_array($ch, array( - CURLOPT_HEADER => TRUE, - CURLOPT_NOBODY => TRUE, - // Follow http redirects to get the real URL. - CURLOPT_FOLLOWLOCATION => TRUE, - CURLOPT_RETURNTRANSFER => TRUE, - CURLOPT_SSL_VERIFYHOST => FALSE, - CURLOPT_SSL_VERIFYPEER => FALSE, - CURLOPT_USERAGENT => Tweeper::$userAgent, - )); - curl_exec($ch); - $url_info = curl_getinfo($ch); - curl_close($ch); - - return $url_info; - } - - /** - * Generate an RSS element. - */ - public static function generateEnclosure($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); - - $url_info = Tweeper::getUrlInfo($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 logXmlError($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); - } - - /** - * Load a stylesheet if the web site is supported. - */ - private function loadStylesheet($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 = $this->getUrlContents($stylesheet); - - $xslDoc = new DOMDocument(); - $xslDoc->loadXML($stylesheet_contents); - - $xsltProcessor = new XSLTProcessor(); - $xsltProcessor->registerPHPFunctions(); - $xsltProcessor->setParameter('', 'generate-enclosure', $this->generate_enclosure); - $xsltProcessor->importStylesheet($xslDoc); - - return $xsltProcessor; - } - - /** - * Convert json to xml. - */ - private function jsonToXml($json, $root_node_name) { - // Apparently 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. - $data = json_decode($json, $assoc = TRUE); - if (!$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' => $root_node_name, - ); - - $xml_data = $serializer->serialize($data, 'xml', $serializer_options); - if (!$xml_data) { - trigger_error("Cannot serialize data", E_USER_ERROR); - return NULL; - } - - return $xml_data; - } - - /** - * Convert the Instagram content to XML. - */ - private function get_xml_instagram_com($html) { - // Extract the json data from the html code. - $json_match_expr = '/window._sharedData = (.*);/'; - $ret = preg_match($json_match_expr, $html, $matches); - if ($ret !== 1) { - trigger_error("Cannot match expression: $json_match_expr\n", E_USER_ERROR); - return NULL; - } - - return $this->jsonToXml($matches[1], 'instagram'); - } - - /** - * Make the Facebook HTML processable. - */ - private function preprocess_html_facebook_com($html) { - $html = str_replace('', '', $html); - return $html; - } - - /** - * Convert the HTML retrieved from the site to XML. - */ - private function htmlToXml($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) { - $this->logXmlError($xml_error); - } - libxml_clear_errors(); - libxml_use_internal_errors($xml_errors_value); - - return $xmlDoc; - } - - /** - * Convert the site content to RSS. - */ - public function tweep($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 = $this->loadStylesheet($host); - if (NULL === $xsltProcessor) { - return NULL; - } - - $html = $this->getUrlContents($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 = $this->htmlToXml($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 $output; - } - -} - -/** * Check if the script is being run from the command line. */ function is_cli() { @@ -426,4 +115,8 @@ if (!isset($options['src_url'])) { } $tweeper = new Tweeper($options['generate_enclosure']); -echo $tweeper->tweep($options['src_url']); +$output = $tweeper->tweep($options['src_url']); +if (is_null($output)) { + exit(1); +} +echo $output;