*
* 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 .
*/
date_default_timezone_set('UTC');
class Tweeper {
private static $USER_AGENT = "Mozilla/5.0 (Windows NT 6.1; rv:22.0) Gecko/20130405 Firefox/22.0";
public function __construct($stylesheet, $generate_enclosure = FALSE) {
$stylesheet_contents = $this->get_contents($stylesheet);
$xslDoc = new DOMDocument();
$xslDoc->loadXML($stylesheet_contents);
$this->xsltProcessor = new XSLTProcessor();
$this->xsltProcessor->registerPHPFunctions();
$this->xsltProcessor->setParameter('', 'generateEnclosure', $generate_enclosure);
$this->xsltProcessor->importStylesheet($xslDoc);
}
public static function epoch_to_gmdate($timestamp)
{
return gmdate('D, d M Y H:i:s', $timestamp) . ' GMT';
}
public static function str_to_gmdate($date)
{
$timestamp = strtotime($date);
return Tweeper::epoch_to_gmdate($timestamp);
}
private static function get_contents($uri) {
# https://www.wjsams.com/c/docs/Wiki/Php-HowToSetUserAgentOnFileGetContents
$opts = array(
'http' => array(
'method' => "GET",
'header' => join(array(
"Accept-language: en\r\n",
"User-Agent: {" + Tweeper::$USER_AGENT + "}\r\n"
))
)
);
$context = stream_context_create($opts);
$contents = file_get_contents($uri, false, $context);
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/vorbis",
"audio/wav",
"audio/webm",
"audio/x-midi",
"image/gif",
"image/jpeg",
"video/avi",
"video/mp4",
"video/mpeg",
"video/ogg",
);
$url_info = Tweeper::get_info($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);
}
public function tweep($uri) {
$html = Tweeper::get_contents($uri);
$xmlDoc = new DOMDocument();
$xmlDoc->loadHTML($html);
$output = $this->xsltProcessor->transformToXML($xmlDoc);
if (FALSE === $output) {
trigger_error('XSL transformation failed.', E_USER_ERROR);
return NULL;
}
return $output;
}
}
function usage($argv)
{
if (php_sapi_name() != 'cli')
$usage = htmlentities("{$_SERVER['SCRIPT_NAME']}?src_url=&generate_enclosure=<0|1>");
else
$usage = "{$argv[0]} [-e|-h|--help] \n";
return "usage: $usage";
}
function parse_options_cli($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:
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;
}
if (php_sapi_name() != 'cli')
$options = parse_options_query_string();
else
$options = parse_options_cli($argv, $argc);
if (!isset($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");
$tweeper = new Tweeper($stylesheet, $options['generate_enclosure']);
echo $tweeper->tweep($options['src_url']);