<?php
/*
* tweeper - a Twitter to RSS web scraper
- *
- * Copyright (C) 2013 Antonio Ospite <ospite@studenti.unina.it>
- *
+ *
+ * Copyright (C) 2013-2015 Antonio Ospite <ao2@ao2.it>
+ *
* 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 <http://www.gnu.org/licenses/>.
*/
-date_default_timezone_set('UTC');
+require_once 'Symfony/Component/Serializer/autoload.php';
-function str_to_gmdate($date)
-{
- $timestamp = strtotime($date);
- return epoch_to_gmdate($timestamp);
-}
+use Symfony\Component\Serializer\Serializer;
+use Symfony\Component\Serializer\Encoder\XmlEncoder;
+use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
-function epoch_to_gmdate($timestamp)
-{
- return gmdate('D, d M Y H:i:s', $timestamp) . ' GMT';
-}
+date_default_timezone_set('UTC');
class Tweeper {
- private $USER_AGENT = "Mozilla/5.0 (Windows NT 6.1; rv:22.0) Gecko/20130405 Firefox/22.0";
+ private static $USER_AGENT = "Mozilla/5.0 (Windows NT 6.1; rv:22.0) Gecko/20130405 Firefox/22.0";
+
+ public function __construct($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($ch, array(
+ CURLOPT_HEADER => FALSE,
+ CURLOPT_FOLLOWLOCATION => TRUE, // follow http redirects to get the real URL
+ CURLOPT_RETURNTRANSFER => TRUE,
+ CURLOPT_SSL_VERIFYHOST => FALSE,
+ CURLOPT_SSL_VERIFYPEER => FALSE,
+ CURLOPT_HTTPHEADER => array('Accept-language: en'),
+ CURLOPT_USERAGENT => Tweeper::$USER_AGENT,
+ ));
+ $contents = curl_exec($ch);
+ curl_close($ch);
+
+ return $contents;
+ }
+
+ private static function get_info($url)
+ {
+ $ch = curl_init($url);
+ curl_setopt_array($ch, array(
+ CURLOPT_HEADER => TRUE,
+ CURLOPT_NOBODY => TRUE,
+ CURLOPT_FOLLOWLOCATION => TRUE, // follow http redirects to get the real URL
+ CURLOPT_RETURNTRANSFER => TRUE,
+ CURLOPT_SSL_VERIFYHOST => FALSE,
+ CURLOPT_SSL_VERIFYPEER => FALSE,
+ CURLOPT_USERAGENT => Tweeper::$USER_AGENT,
+ ));
+ curl_exec($ch);
+ $url_info = curl_getinfo($ch);
+ curl_close($ch);
+
+ return $url_info;
+ }
+
+ public static function generate_enclosure($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;
+ }
+
+ $output .= trim($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);
+ $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 === $output) {
trigger_error('XSL transformation failed.', E_USER_ERROR);
}
}
+function is_cli()
+{
+ return (php_sapi_name() === "cli");
+}
+
function usage($argv)
{
- if (php_sapi_name() != 'cli')
- $usage = htmlentities("{$_SERVER['SCRIPT_NAME']}?src_url=<src_url>");
- else
- $usage = "{$argv[0]} <src_url>\n";
+ if (is_cli()) {
+ $usage = "{$argv[0]} [-e|-h|--help] <src_url>\n";
+ } else {
+ $usage = htmlentities("{$_SERVER['SCRIPT_NAME']}?src_url=<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']);
projects / tweeper.git / blobdiff