X-Git-Url: https://git.ao2.it/tweeper.git/blobdiff_plain/1e04fc440d06b3871575bae5902167282fd1476e..8a6c65c179aa213368c9941da4dd47faf043b236:/tweeper.php?ds=inline diff --git a/tweeper.php b/tweeper.php index cd2c3ba..bed6350 100644 --- a/tweeper.php +++ b/tweeper.php @@ -1,108 +1,287 @@ - * + * + * Copyright (C) 2013-2015 Antonio Ospite + * * 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 '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'); -function str_to_gmdate($date) -{ - $timestamp = strtotime($date); - return epoch_to_gmdate($timestamp); -} +class Tweeper { -function epoch_to_gmdate($timestamp) -{ - return gmdate('D, d M Y H:i:s', $timestamp) . ' GMT'; -} + private static $USER_AGENT = "Mozilla/5.0 (Windows NT 6.1; rv:22.0) Gecko/20130405 Firefox/22.0"; -function get_url_info($url) -{ - $ch = curl_init($url); - curl_setopt_array($ch, array( - CURLOPT_HEADER => TRUE, // get the header - CURLOPT_NOBODY => TRUE, // don't donwload body - CURLOPT_FOLLOWLOCATION => TRUE, // the magic sauce + public function __construct($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($ch, array( + CURLOPT_HEADER => FALSE, + CURLOPT_FOLLOWLOCATION => TRUE, // follow http redirects to get the real URL CURLOPT_RETURNTRANSFER => TRUE, - CURLOPT_SSL_VERIFYHOST => FALSE, // suppress certain SSL errors + CURLOPT_SSL_VERIFYHOST => FALSE, CURLOPT_SSL_VERIFYPEER => FALSE, - )); - curl_exec($ch); - $url_info = curl_getinfo($ch);; - curl_close($ch); + CURLOPT_HTTPHEADER => array('Accept-language: en'), + CURLOPT_USERAGENT => Tweeper::$USER_AGENT, + )); + $contents = curl_exec($ch); + curl_close($ch); - return $url_info; -} + return $contents; + } -function generate_enclosure($url) { - $url_info = get_url_info($url); + private static function get_info($url) + { + $ch = curl_init($url); + curl_setopt_array($ch, array( + CURLOPT_HEADER => TRUE, + CURLOPT_NOBODY => TRUE, + CURLOPT_FOLLOWLOCATION => TRUE, // follow http redirects to get the real URL + CURLOPT_RETURNTRANSFER => TRUE, + CURLOPT_SSL_VERIFYHOST => FALSE, + CURLOPT_SSL_VERIFYPEER => FALSE, + CURLOPT_USERAGENT => Tweeper::$USER_AGENT, + )); + curl_exec($ch); + $url_info = curl_getinfo($ch); + curl_close($ch); - $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']); + return $url_info; + } - $dom->appendChild($enc); + 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", + ); - return $dom->saveXML($enc); -} + // 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); -class Tweeper { + $supported = in_array($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 ''; + } - private $USER_AGENT = "Mozilla/5.0 (Windows NT 6.1; rv:22.0) Gecko/20130405 Firefox/22.0"; + $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; + } - public function __construct($stylesheet) { $stylesheet_contents = $this->get_contents($stylesheet); $xslDoc = new DOMDocument(); $xslDoc->loadXML($stylesheet_contents); - $this->xsltProcessor = new XSLTProcessor(); - $this->xsltProcessor->registerPHPFunctions(); - $this->xsltProcessor->importStylesheet($xslDoc); + $xsltProcessor = new XSLTProcessor(); + $xsltProcessor->registerPHPFunctions(); + $xsltProcessor->setParameter('', 'generateEnclosure', $this->generate_enclosure); + $xsltProcessor->importStylesheet($xslDoc); + + return $xsltProcessor; } - private function get_contents($uri) { - # https://www.wjsams.com/c/docs/Wiki/Php-HowToSetUserAgentOnFileGetContents - $opts = array( - 'http' => array( - 'method' => "GET", - 'header' => join(array( - "Accept-language: en\r\n", - "User-Agent: {$this->USER_AGENT}\r\n" - )) - ) + 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, ); - $context = stream_context_create($opts); - $contents = file_get_contents($uri, false, $context); - return $contents; + $xml_data = $serializer->serialize($data, 'xml', $serializer_options); + if (!$xml_data) { + trigger_error("Cannot serialize data", E_USER_ERROR); + return NULL; + } + + return $xml_data; } - public function tweep($uri) { - $html = $this->get_contents($uri); + 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(); - $xmlDoc->loadHTML($html); - $output = $this->xsltProcessor->transformToXML($xmlDoc); + // 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 === $output) { trigger_error('XSL transformation failed.', E_USER_ERROR); @@ -112,35 +291,80 @@ class Tweeper { } } +function is_cli() +{ + return (php_sapi_name() === "cli"); +} + function usage($argv) { - if (php_sapi_name() != 'cli') - $usage = htmlentities("{$_SERVER['SCRIPT_NAME']}?src_url="); - else - $usage = "{$argv[0]} \n"; + if (is_cli()) { + $usage = "{$argv[0]} [-e|-h|--help] \n"; + } else { + $usage = htmlentities("{$_SERVER['SCRIPT_NAME']}?src_url=&generate_enclosure=<0|1>"); + } return "usage: $usage"; } -if (isset($_GET['src_url'])) { - $src_url = $_GET['src_url']; -} else if (isset($argv[1])) { - if ($argv[1] == "-h" || $argv[1] == "--help") { - echo usage($argv); - return 0; +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); + } } - $src_url = $argv[1]; -} else { - die(usage($argv)); + + $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 $options; } -$url = parse_url($src_url); -if (FALSE === $url || empty($url["host"])) - die("Invalid url: $src_url\n"); -$stylesheet = __DIR__ . "/rss_converter_" . $url["host"] . ".xsl"; -if (FALSE === file_exists($stylesheet)) - die("Conversion to RSS not supported: {$url["host"]}\n"); +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(is_cli() ? $argv : NULL)); + exit(1); +} -$tweeper = new Tweeper($stylesheet); -echo $tweeper->tweep($src_url); +$tweeper = new Tweeper($options['generate_enclosure']); +echo $tweeper->tweep($options['src_url']);