X-Git-Url: https://git.ao2.it/tweeper.git/blobdiff_plain/50842e9d4c8ba313313710d0b4472548390cd77b..3f3df99b377eca4f2ed8870ff3f4559abd0bec80:/tweeper.php?ds=inline diff --git a/tweeper.php b/tweeper.php index 17fff8b..bfc07f2 100644 --- a/tweeper.php +++ b/tweeper.php @@ -1,6 +1,7 @@ * @@ -18,33 +19,60 @@ * along with this program. If not, see . */ +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"; + /** + * 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 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) - { + /** + * Convert generic date string to the date format expected in a RSS document. + */ + 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($url) - { + /** + * Get the contents from a URL. + */ + private static function get_contents($url) { $ch = curl_init($url); curl_setopt_array($ch, array( CURLOPT_HEADER => FALSE, - CURLOPT_FOLLOWLOCATION => TRUE, // follow http redirects to get the real URL + // Follow http redirects to get the real URL. + CURLOPT_FOLLOWLOCATION => TRUE, CURLOPT_RETURNTRANSFER => TRUE, CURLOPT_SSL_VERIFYHOST => FALSE, CURLOPT_SSL_VERIFYPEER => FALSE, @@ -57,13 +85,16 @@ class Tweeper { return $contents; } - private static function get_info($url) - { + /** + * Get the headers from a URL. + */ + 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 + // Follow http redirects to get the real URL. + CURLOPT_FOLLOWLOCATION => TRUE, CURLOPT_RETURNTRANSFER => TRUE, CURLOPT_SSL_VERIFYHOST => FALSE, CURLOPT_SSL_VERIFYPEER => FALSE, @@ -76,8 +107,10 @@ class Tweeper { return $url_info; } - public static function generate_enclosure($url) - { + /** + * Generate an RSS element. + */ + public static function generate_enclosure($url) { $supported_content_types = array( "application/ogg", "audio/aac", @@ -96,7 +129,11 @@ class Tweeper { "video/ogg", ); - $url_info = Tweeper::get_info($url); + // 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) { @@ -115,39 +152,47 @@ class Tweeper { return $dom->saveXML($enc); } - /* Mimic the message from libxml.c::php_libxml_ctx_error_level() */ + /** + * 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; + 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); } + /** + * Load a stylesheet if the web site is supported. + */ 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); + trigger_error("Conversion to RSS not supported for $host ($stylesheet not found)", E_USER_ERROR); return NULL; } @@ -164,31 +209,122 @@ class Tweeper { return $xsltProcessor; } - public function tweep($src_url) { - $url = parse_url($src_url); - if (FALSE === $url || empty($url["host"])) { - trigger_error("Invalid url: $src_url", E_USER_ERROR); + /** + * Convert json to xml. + */ + private function json_to_xml($json, $root_node_name) { + // 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. + $data = json_decode($json, $assoc = TRUE); + if (!$data) { return NULL; } - $xsltProcessor = $this->load_stylesheet($url["host"]); - if (NULL === $xsltProcessor) { + $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; } - $html = Tweeper::get_contents($src_url); + 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 $this->json_to_xml($matches[1], 'instagram'); + } + + /** + * Make the Facebook HTML processable. + */ + private function preprocess_html_facebook_com($html) { + $html = str_replace('', '', $html); + return $html; + } + + /** + * Convert the HTML retrieved from the site to XML. + */ + private function html_to_xml($html, $host) { $xmlDoc = new DOMDocument(); // Handle warnings and errors when loading invalid HTML. - $xml_errors_value = libxml_use_internal_errors(true); - $xmlDoc->loadHTML($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 $xmlDoc; + } + + /** + * Convert the site content to RSS. + */ + public function tweep($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 = $this->load_stylesheet($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) { @@ -197,40 +333,57 @@ class Tweeper { } return $output; } + } -function usage($argv) -{ - if (php_sapi_name() != 'cli') - $usage = htmlentities("{$_SERVER['SCRIPT_NAME']}?src_url=&generate_enclosure=<0|1>"); - else +/** + * Check if the script is being run from the command line. + */ +function is_cli() { + return (php_sapi_name() === "cli"); +} + +/** + * Show the script usage. + */ +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, $argc) -{ +/** + * Parse command line options. + */ +function parse_options_cli($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($argv)); + exit(1); } } @@ -239,32 +392,36 @@ function parse_options_cli($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 (php_sapi_name() != 'cli') { - $options = parse_options_query_string(); - $ERROR_STREAM = fopen('php://output', 'w'); -} else { +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)); + fwrite($ERROR_STREAM, usage(is_cli() ? $argv : NULL)); exit(1); }