X-Git-Url: https://git.ao2.it/tweeper.git/blobdiff_plain/b453301fecc757e4d95191a65b24259e81b53f87..47350899b24fb9a79bd9f57bcabc7281b9a01e34:/tweeper.php diff --git a/tweeper.php b/tweeper.php index f07382b..f7e0a88 100644 --- a/tweeper.php +++ b/tweeper.php @@ -1,6 +1,7 @@ * @@ -18,48 +19,74 @@ * along with this program. If not, see . */ -require_once 'XML/Serializer.php'; +require_once 'Symfony/Component/Serializer/autoload.php'; + +use Symfony\Component\Serializer\Serializer; +use Symfony\Component\Serializer\Encoder\XmlEncoder; +use Symfony\Component\Serializer\Normalizer\ObjectNormalizer; date_default_timezone_set('UTC'); +/** + * Scrape supported websites and perform conversion to RSS. + */ class Tweeper { - private static $USER_AGENT = "Mozilla/5.0 (Windows NT 6.1; rv:22.0) Gecko/20130405 Firefox/22.0"; + 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 = $generate_enclosure; } - public static function epoch_to_gmdate($timestamp) - { + /** + * 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('D, d M Y H:i:s', $timestamp) . ' GMT'; + return gmdate(DATE_RSS, $timestamp); } - public static function str_to_gmdate($date) - { + /** + * Convert generic date string to the date format expected in a RSS document. + */ + public static function strToRssDate($date) { $timestamp = strtotime($date); if (FALSE === $timestamp) { $timestamp = 0; } - return Tweeper::epoch_to_gmdate($timestamp); + return Tweeper::epochToRssDate($timestamp); + } + + /** + * Convert string to UpperCamelCase. + */ + public static function toUpperCamelCase($str, $delim = ' ') { + $str_upper = ucwords($str, $delim); + $str_camel_case = str_replace($delim, '', $str_upper); + return $str_camel_case; } - private static function get_contents($url) - { + /** + * Get the contents from a URL. + */ + private static function getUrlContents($url) { $ch = curl_init($url); curl_setopt_array($ch, array( CURLOPT_HEADER => FALSE, - CURLOPT_FOLLOWLOCATION => TRUE, // follow http redirects to get the real URL + // Follow http redirects to get the real URL. + CURLOPT_FOLLOWLOCATION => TRUE, CURLOPT_RETURNTRANSFER => TRUE, CURLOPT_SSL_VERIFYHOST => FALSE, CURLOPT_SSL_VERIFYPEER => FALSE, CURLOPT_HTTPHEADER => array('Accept-language: en'), - CURLOPT_USERAGENT => Tweeper::$USER_AGENT, + CURLOPT_USERAGENT => Tweeper::$userAgent, )); $contents = curl_exec($ch); curl_close($ch); @@ -67,17 +94,20 @@ class Tweeper { return $contents; } - private static function get_info($url) - { + /** + * Get the headers from a URL. + */ + private static function getUrlInfo($url) { $ch = curl_init($url); curl_setopt_array($ch, array( CURLOPT_HEADER => TRUE, CURLOPT_NOBODY => TRUE, - CURLOPT_FOLLOWLOCATION => TRUE, // follow http redirects to get the real URL + // Follow http redirects to get the real URL. + CURLOPT_FOLLOWLOCATION => TRUE, CURLOPT_RETURNTRANSFER => TRUE, CURLOPT_SSL_VERIFYHOST => FALSE, CURLOPT_SSL_VERIFYPEER => FALSE, - CURLOPT_USERAGENT => Tweeper::$USER_AGENT, + CURLOPT_USERAGENT => Tweeper::$userAgent, )); curl_exec($ch); $url_info = curl_getinfo($ch); @@ -86,8 +116,10 @@ class Tweeper { return $url_info; } - public static function generate_enclosure($url) - { + /** + * Generate an RSS element. + */ + public static function generateEnclosure($url) { $supported_content_types = array( "application/ogg", "audio/aac", @@ -100,17 +132,18 @@ class Tweeper { "audio/x-midi", "image/gif", "image/jpeg", + "image/png", "video/avi", "video/mp4", "video/mpeg", "video/ogg", ); - // The RSS specification says that the enclosure element url must be http. + // 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); + $url_info = Tweeper::getUrlInfo($http_url); $supported = in_array($url_info['content_type'], $supported_content_types); if (!$supported) { @@ -118,124 +151,125 @@ class Tweeper { return ''; } - $dom = new DomDocument(); + $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); + return $enc; } - /* Mimic the message from libxml.c::php_libxml_ctx_error_level() */ - private function log_xml_error($error) { + /** + * Mimic the message from libxml.c::php_libxml_ctx_error_level() + */ + private static 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; + 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 { + } + else { $output .= " in Entity,"; } - $output .=" line $error->line"; + $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); + /** + * Convert json to XML. + */ + private static 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; } - $stylesheet_contents = $this->get_contents($stylesheet); + $encoder = new XmlEncoder(); + $normalizer = new ObjectNormalizer(); + $serializer = new Serializer(array($normalizer), array($encoder)); - $xslDoc = new DOMDocument(); - $xslDoc->loadXML($stylesheet_contents); + $serializer_options = array( + 'xml_encoding' => "UTF-8", + 'xml_format_output' => TRUE, + 'xml_root_node_name' => $root_node_name, + ); - $xsltProcessor = new XSLTProcessor(); - $xsltProcessor->registerPHPFunctions(); - $xsltProcessor->setParameter('', 'generateEnclosure', $this->generate_enclosure); - $xsltProcessor->importStylesheet($xslDoc); + $xml_data = $serializer->serialize($data, 'xml', $serializer_options); + if (!$xml_data) { + trigger_error("Cannot serialize data", E_USER_ERROR); + return NULL; + } - return $xsltProcessor; + return $xml_data; } - private function json_to_xml($html, $json_match_expr, $rootName) { - // pre-process, convert json to XML + /** + * Convert the Instagram content to XML. + */ + private function getXmlInstagramCom($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; } - $data = json_decode($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 $serializer->getSerializedData(); + return Tweeper::jsonToXml($matches[1], 'instagram'); } - private function get_xml_instagram_com($html) { - return $this->json_to_xml($html, '/window._sharedData = (.*);/', 'instagram'); - } - - private function preprocess_html_facebook_com($html) { + /** + * Make the Facebook HTML processable. + */ + private function preprocessHtmlFacebookCom($html) { $html = str_replace('', '', $html); return $html; } - private function html_to_xml($html, $host) { + /** + * Convert the HTML retrieved from the site to XML. + */ + private function htmlToXml($html, $host) { $xmlDoc = new DOMDocument(); // Handle warnings and errors when loading invalid HTML. - $xml_errors_value = libxml_use_internal_errors(true); + $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 there is a host-specific method to get the XML data, use it! + $get_xml_host_method = 'getXml' . Tweeper::toUpperCamelCase($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 { + } + else { $xmlDoc->loadHTML($html); } foreach (libxml_get_errors() as $xml_error) { - $this->log_xml_error($xml_error); + Tweeper::logXmlError($xml_error); } libxml_clear_errors(); libxml_use_internal_errors($xml_errors_value); @@ -243,32 +277,58 @@ class Tweeper { return $xmlDoc; } + /** + * Load a stylesheet if the web site is supported. + */ + private function loadStylesheet($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; + } + + $stylesheet_contents = Tweeper::getUrlContents($stylesheet); + + $xslDoc = new DOMDocument(); + $xslDoc->loadXML($stylesheet_contents); + + $xsltProcessor = new XSLTProcessor(); + $xsltProcessor->registerPHPFunctions(); + $xsltProcessor->setParameter('', 'generate-enclosure', $this->generate_enclosure); + $xsltProcessor->importStylesheet($xslDoc); + + return $xsltProcessor; + } + + /** + * Convert the site content to RSS. + */ public function tweep($src_url) { $url = parse_url($src_url); if (FALSE === $url || empty($url["host"])) { - trigger_error("Invalid url: $src_url", E_USER_ERROR); + trigger_error("Invalid URL: $src_url", E_USER_ERROR); return NULL; } - // Strip the leading www. to be more forgiving on input URLs + // Strip the leading www. to be more forgiving on input URLs. $host = preg_replace('/^www\./', '', $url["host"]); - $xsltProcessor = $this->load_stylesheet($host); + $xsltProcessor = $this->loadStylesheet($host); if (NULL === $xsltProcessor) { return NULL; } - $html = $this->get_contents($src_url); + $html = Tweeper::getUrlContents($src_url); if (FALSE === $html) { return NULL; } - $preprocess_html_host_method = 'preprocess_html_' . str_replace(".", "_", $host); + $preprocess_html_host_method = 'preprocessHtml' . Tweeper::toUpperCamelCase($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); + $xmlDoc = $this->htmlToXml($html, $host); if (NULL === $xmlDoc) { return NULL; } @@ -281,46 +341,57 @@ class Tweeper { } 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($argv)); + exit(1); } } @@ -329,32 +400,36 @@ function parse_options_cli($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($ERROR_STREAM, usage($argv)); + fwrite($error_stream, usage(is_cli() ? $argv : NULL)); exit(1); }