X-Git-Url: https://git.ao2.it/tweeper.git/blobdiff_plain/21601a9299810f223341ff4bed4f9649f5ea0359..ffca987d457b748c0a95da5caa5b2143ec370f53:/tweeper.php?ds=sidebyside diff --git a/tweeper.php b/tweeper.php index 87efd60..bcc85fe 100644 --- a/tweeper.php +++ b/tweeper.php @@ -1,9 +1,10 @@ + * Copyright (C) 2013-2020 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 @@ -19,346 +20,13 @@ * along with this program. If not, see . */ -require_once 'Symfony/Component/Serializer/autoload.php'; +require_once 'autoload.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); - } - - /** - * Convert string to UpperCamelCase. - */ - public static function toUpperCamelCase($str, $delim = ' ') { - $str_upper = ucwords($str, $delim); - $str_camel_case = str_replace($delim, '', $str_upper); - return $str_camel_case; - } - - /** - * Get the contents from a URL. - */ - private static function getUrlContents($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); - if (FALSE === $contents) { - trigger_error(curl_error($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); - if (FALSE === $url_info) { - trigger_error(curl_error($ch)); - } - curl_close($ch); - - return $url_info; - } - - /** - * Generate an RSS element. - */ - public static function generateEnclosure($url) { - $supported_content_types = array( - "application/octet-stream", - "application/ogg", - "application/pdf", - "audio/aac", - "audio/mp4", - "audio/mpeg", - "audio/ogg", - "audio/vorbis", - "audio/wav", - "audio/webm", - "audio/x-midi", - "image/gif", - "image/jpeg", - "image/png", - "video/avi", - "video/mp4", - "video/mpeg", - "video/ogg", - ); - - $url_info = Tweeper::getUrlInfo($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 ''; - } - - // 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_info['url']); - - $dom = new DOMDocument(); - $enc = $dom->createElement('enclosure'); - $enc->setAttribute('url', $http_url); - $enc->setAttribute('length', $url_info['download_content_length']); - $enc->setAttribute('type', $url_info['content_type']); - - return $enc; - } - - /** - * Mimic the message from libxml.c::php_libxml_ctx_error_level() - */ - private static function logXmlError($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; - } - - $output .= trim($error->message); - - if ($error->file) { - $output .= " in $error->file"; - } - else { - $output .= " in Entity,"; - } - - $output .= " line $error->line"; - - error_log($output); - } - - /** - * 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; - } - - $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 $xml_data; - } - - /** - * Convert the Instagram content to XML. - */ - private function getXmlInstagramCom($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: $json_match_expr\n", E_USER_ERROR); - return NULL; - } - - return Tweeper::jsonToXml($matches[1], 'instagram'); - } - - /** - * Make the Facebook HTML processable. - */ - private function preprocessHtmlFacebookCom($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! - $get_xml_host_method = 'getXml' . Tweeper::toUpperCamelCase($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 { - $xmlDoc->loadHTML($html); - } - - foreach (libxml_get_errors() as $xml_error) { - Tweeper::logXmlError($xml_error); - } - libxml_clear_errors(); - libxml_use_internal_errors($xml_errors_value); - - 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); - return NULL; - } - - $scheme = $url["scheme"]; - if (!in_array($scheme, array("http", "https"))) { - trigger_error("unsupported scheme: $scheme", 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; - } - - $html = Tweeper::getUrlContents($src_url); - if (FALSE === $html) { - return NULL; - } - - $preprocess_html_host_method = 'preprocessHtml' . Tweeper::toUpperCamelCase($host, '.'); - if (method_exists($this, $preprocess_html_host_method)) { - $html = call_user_func_array(array($this, $preprocess_html_host_method), array($html)); - } - - $xmlDoc = $this->htmlToXml($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 $output; - } - -} - -/** * Check if the script is being run from the command line. */ function is_cli() { @@ -370,10 +38,10 @@ function is_cli() { */ function usage($argv) { if (is_cli()) { - $usage = "{$argv[0]} [-e|-h|--help] \n"; + $usage = "{$argv[0]} [-e|-m <0|1>|-u <0|1>|-v <0|1>|-h|--help] \n"; } else { - $usage = htmlentities("{$_SERVER['SCRIPT_NAME']}?src_url=&generate_enclosure=<0|1>"); + $usage = htmlentities("{$_SERVER['SCRIPT_NAME']}?src_url=&generate_enclosure=<0|1>&show_usernames=<0|1>&show_multimedia=<0|1>&verbose_output=<0|1>"); } return "usage: $usage"; @@ -383,21 +51,54 @@ function usage($argv) { * Parse command line options. */ function parse_options_cli($argv, $argc) { - $options = array( + $options = [ 'generate_enclosure' => FALSE, - ); + 'show_usernames' => TRUE, + 'show_multimedia' => TRUE, + 'verbose_output' => TRUE, + ]; if ($argc < 2) { return $options; } - $cli_options = getopt("eh", array("help")); + $cli_options = getopt("em:u:v:h", ["help"]); foreach ($cli_options as $opt => $val) { switch ($opt) { case 'e': $options['generate_enclosure'] = TRUE; break; + case 'm': + $ret = filter_var($val, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE); + if (NULL === $ret) { + fwrite(STDERR, "Invalid argument for the -m option.\n"); + fwrite(STDERR, usage($argv)); + exit(1); + } + $options['show_multimedia'] = $val; + break; + + case 'u': + $ret = filter_var($val, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE); + if (NULL === $ret) { + fwrite(STDERR, "Invalid argument for the -u option.\n"); + fwrite(STDERR, usage($argv)); + exit(1); + } + $options['show_usernames'] = $val; + break; + + case 'v': + $ret = filter_var($val, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE); + if (NULL === $ret) { + fwrite(STDERR, "Invalid argument for the -v option.\n"); + fwrite(STDERR, usage($argv)); + exit(1); + } + $options['verbose_output'] = $val; + break; + case 'h': case 'help': echo usage($argv); @@ -409,7 +110,9 @@ function parse_options_cli($argv, $argc) { } } - $options['src_url'] = $argv[count($cli_options) + 1]; + // For now assume that the URL is the lest argument, in the future we could + // switch to PHP >= 7.1 and use the $optind argument of getopt(). + $options['src_url'] = array_pop($argv); return $options; } @@ -418,9 +121,12 @@ function parse_options_cli($argv, $argc) { * Parse options passed from a query string. */ function parse_options_query_string() { - $options = array( + $options = [ 'generate_enclosure' => FALSE, - ); + 'show_usernames' => TRUE, + 'show_multimedia' => TRUE, + 'verbose_output' => TRUE, + ]; if (isset($_GET['src_url'])) { $options['src_url'] = $_GET['src_url']; @@ -430,6 +136,18 @@ function parse_options_query_string() { $options['generate_enclosure'] = $_GET['generate_enclosure'] == 1; } + if (isset($_GET['show_multimedia'])) { + $options['show_multimedia'] = $_GET['show_multimedia'] != 0; + } + + if (isset($_GET['show_usernames'])) { + $options['show_usernames'] = $_GET['show_usernames'] != 0; + } + + if (isset($_GET['verbose_output'])) { + $options['verbose_output'] = $_GET['verbose_output'] != 0; + } + return $options; } @@ -447,7 +165,7 @@ if (!isset($options['src_url'])) { exit(1); } -$tweeper = new Tweeper($options['generate_enclosure']); +$tweeper = new Tweeper($options['generate_enclosure'], $options['show_usernames'], $options['show_multimedia'], $options['verbose_output']); $output = $tweeper->tweep($options['src_url']); if (is_null($output)) { exit(1);