X-Git-Url: https://git.ao2.it/tweeper.git/blobdiff_plain/d38cac35c8e0aed0a223533bb54e46958c693212..b8bf7a34c475cf0b9c883d461198356ae7786412:/tweeper.php diff --git a/tweeper.php b/tweeper.php index 45bc786..a9fce9b 100644 --- a/tweeper.php +++ b/tweeper.php @@ -1,128 +1,279 @@ - * + * + * 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 'XML/Serializer.php'; + date_default_timezone_set('UTC'); -define('USER_AGENT', 'Mozilla/5.0 (Windows NT 6.1; rv:22.0) Gecko/20130405 Firefox/22.0'); +class Tweeper { -function str_to_gmdate($date) -{ - $timestamp = strtotime($date); - return epoch_to_gmdate($timestamp); -} + private static $USER_AGENT = "Mozilla/5.0 (Windows NT 6.1; rv:22.0) Gecko/20130405 Firefox/22.0"; -function epoch_to_gmdate($timestamp) -{ - return gmdate('D, d M Y H:i:s', $timestamp) . ' GMT'; -} + public function __construct($generate_enclosure = FALSE) { + $this->generate_enclosure = $generate_enclosure; + } -function get_url_info($url) -{ - $ch = curl_init($url); - curl_setopt_array($ch, array( + public static function epoch_to_gmdate($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($ch, array( CURLOPT_HEADER => TRUE, CURLOPT_NOBODY => TRUE, CURLOPT_FOLLOWLOCATION => TRUE, // follow http redirects to get the real URL CURLOPT_RETURNTRANSFER => TRUE, CURLOPT_SSL_VERIFYHOST => FALSE, CURLOPT_SSL_VERIFYPEER => FALSE, - CURLOPT_USERAGENT => USER_AGENT, - )); - curl_exec($ch); - $url_info = curl_getinfo($ch);; - curl_close($ch); + CURLOPT_USERAGENT => Tweeper::$USER_AGENT, + )); + curl_exec($ch); + $url_info = curl_getinfo($ch); + curl_close($ch); - return $url_info; -} + return $url_info; + } -function generate_enclosure($url) -{ - $url_info = get_url_info($url); - - switch($url_info['content_type']) { - case "video/avi": - case "image/gif": - case "image/jpeg": - case "audio/x-midi": - case "audio/mpeg": - case "video/mpeg": - case "audio/vorbis": - case "application/ogg": - case "audio/webm": - case "audio/aac": - case "audio/mp4": - case "audio/wav": - case "video/mp4": - case "video/ogg": - $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); - default: - return; + 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; + } -class Tweeper { + $output .= trim($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 - $opts = array( - 'http' => array( - 'method' => "GET", - 'header' => join(array( - "Accept-language: en\r\n", - "User-Agent: {" + USER_AGENT + "}\r\n" - )) - ) + private function json_to_xml($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; + } + + $data = json_decode($matches[1]); + if (!$data) { + return NULL; + } + + $serializer_options = array ( + 'addDecl' => TRUE, + 'encoding' => "UTF-8", + 'indent' => ' ', + 'rootName' => $rootName, ); - $context = stream_context_create($opts); - $contents = file_get_contents($uri, false, $context); - return $contents; + $serializer = new XML_Serializer($serializer_options); + + $status = $serializer->serialize($data); + if (PEAR::isError($status)) { + trigger_error($status->getMessage(), E_USER_ERROR); + return NULL; + } + + return $serializer->getSerializedData(); + } + + private function get_xml_instagram_com($html) { + return $this->json_to_xml($html, '/window._sharedData = (.*);/', 'instagram'); } - public function tweep($uri) { - $html = $this->get_contents($uri); + 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 === $output) { trigger_error('XSL transformation failed.', E_USER_ERROR); @@ -132,32 +283,44 @@ class Tweeper { } } +function is_cli() +{ + return (php_sapi_name() === "cli"); +} + function usage($argv) { - if (php_sapi_name() != 'cli') - $usage = htmlentities("{$_SERVER['SCRIPT_NAME']}?src_url="); - else - $usage = "{$argv[0]} [-h|--help] \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: $usage"; } function parse_options_cli($argv, $argc) { - $options = array(); + $options = array( + 'generate_enclosure' => FALSE + ); if ($argc < 2) return $options; - $cli_options = getopt("h", array("help")); + $cli_options = getopt("eh", array("help")); foreach ($cli_options as $opt => $val) { switch ($opt) { + case 'e': + $options['generate_enclosure'] = TRUE; + break; case 'h': case 'help': echo usage($argv); exit(0); default: - die(usage($argv)); + fwrite(STDERR, usage($argv)); + exit(1); } } @@ -168,30 +331,32 @@ function parse_options_cli($argv, $argc) function parse_options_query_string() { - $options = array(); + $options = array( + 'generate_enclosure' => FALSE + ); if (isset($_GET['src_url'])) $options['src_url'] = $_GET['src_url']; + if (isset($_GET['generate_enclosure'])) + $options['generate_enclosure'] = $_GET['generate_enclosure'] == 1; + return $options; } -if (php_sapi_name() != 'cli') - $options = parse_options_query_string(); -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'])) - die(usage($argv)); - -$url = parse_url($options['src_url']); -if (FALSE === $url || empty($url["host"])) - die("Invalid url: ${options['src_url']}\n"); - -$stylesheet = __DIR__ . "/rss_converter_" . $url["host"] . ".xsl"; -if (FALSE === file_exists($stylesheet)) - die("Conversion to RSS not supported: {$url["host"]}\n"); +if (!isset($options['src_url'])) { + fwrite($ERROR_STREAM, usage(is_cli() ? $argv : NULL)); + exit(1); +} -$tweeper = new Tweeper($stylesheet); +$tweeper = new Tweeper($options['generate_enclosure']); echo $tweeper->tweep($options['src_url']);