<?php
/**
* This file implements trackback functions.
*
* This file is part of the b2evolution/evocms project - {@link http://b2evolution.net/}.
* See also {@link https://github.com/b2evolution/b2evolution}.
*
* @license GNU GPL v2 - {@link http://b2evolution.net/about/gnu-gpl-license}
*
* @copyright (c)2003-2020 by Francois Planque - {@link http://fplanque.com/}.
* Parts of this file are copyright (c)2004-2005 by Daniel HAHLER - {@link http://thequod.de/contact}.
*
* @package evocore
*/
if( !defined('EVO_MAIN_INIT') ) die( 'Please, do not access this page directly.' );
/**
* trackbacks(-)
*
* Do multiple trackbacks
*
* fplanque: added
*/
function trackbacks( $post_trackbacks, $Item )
{
global $Messages;
$excerpt = $Item->get_excerpt();
$Messages->add( T_('Excerpt sent in trackbacks:').' '.$excerpt, 'note' );
$trackback_urls = preg_split( '/( )+/', $post_trackbacks, 10 ); // fplanque: ;
foreach($trackback_urls as $tb_url)
{ // trackback each url:
$tb_url = trim($tb_url);
if( empty( $tb_url ) ) continue;
trackback( $tb_url, $Item->title, $excerpt, $Item->ID, $Item->get_permanent_url('', '', '&') );
}
}
/**
* Send Trackback to single URL
*
* trackback(-)
*
* @todo add autodiscovery
*/
function trackback(
$trackback_url,
$title,
$excerpt,
$ID,
$url ) // post ID
{
global $app_name, $app_version, $Collection, $Blog, $Messages;
$trackback_message = T_('Sending trackback to:').' '.htmlspecialchars($trackback_url).' ';
$title = rawurlencode($title);
$excerpt = rawurlencode($excerpt);
$blog_name = rawurlencode($Blog->get( 'name' ));
$url = rawurlencode($url);
// dis is the trackback stuff to be sent:
$query_string = 'title='.$title.'&url='.$url.'&blog_name='.$blog_name.'&excerpt='.$excerpt;
// echo "url:$trackback_url<br>$sending:$query_string<br />";
$result = '';
if (strstr($trackback_url, '?'))
{ // use a HTTP GET request
$Messages->add( $trackback_message.'[get]', 'note' );
$trackback_url = parse_url($trackback_url.'&'.$query_string);
if (!empty($trackback_url['host']) && !empty($trackback_url['path'])
&& ($fp = @fsockopen($trackback_url['host'], 80, $foo, $foo, 20)) !== false)
{
$header = 'GET '.$trackback_url['path'].'?'.$trackback_url['query']." HTTP/1.0\r\n";
$header .= 'Host: '.$trackback_url['host']."\r\n";
$header .= 'User-Agent: '.$app_name.'/'.$app_version."\r\n\r\n";
fwrite($fp, $header, strlen($header));
if(function_exists('stream_set_timeout'))
{
stream_set_timeout($fp, 20); // PHP 4.3.0
}
else
{
socket_set_timeout($fp, 20); // PHP 4
}
while (!feof($fp))
{
$result .= fgets($fp);
}
fclose($fp);
/* debug code
$df = fopen('trackback.log', 'a');
fwrite($df, "---------\nRequest:\n\n$header\n\nResponse:\n\n$result\n");
fclose($df);
*/
}
}
else
{
$Messages->add( $trackback_message.'[post]', 'note' );
$trackback_url = parse_url($trackback_url);
if( ! empty($trackback_url['host']) && ! empty($trackback_url['path']) )
{ // Only try trackback if we have host and path:
$port = isset($trackback_url['port']) ? $trackback_url['port'] : 80;
$http_request = 'POST '.$trackback_url['path']." HTTP/1.0\r\n";
$http_request .= 'Host: '.$trackback_url['host']."\r\n";
$http_request .= 'Content-Type: application/x-www-form-urlencoded'."\r\n";
$http_request .= 'Content-Length: '.strlen($query_string)."\r\n";
$http_request .= "User-Agent: $app_name/$app_version\r\n";
$http_request .= "\r\n";
$http_request .= $query_string;
evo_flush();
if( $fs = @fsockopen($trackback_url['host'], $port, $errno, $errst, 20) ) // this timeout is just for setting up the socket
{
// Set timeout for data:
if( function_exists('stream_set_timeout') )
{
stream_set_timeout( $fs, 20 ); // PHP 4.3.0
}
else
{
socket_set_timeout( $fs, 20 ); // PHP 4
}
fputs($fs, $http_request);
$result = '';
while(!feof($fs))
{
$result .= fgets($fs, 4096);
}
/* debug code
$debug_file = 'trackback.log';
$fp = fopen($debug_file, 'a');
fwrite($fp, "\n*****\nRequest:\n\n$http_request\n\nResponse:\n\n$result");
while(!@feof($fs)) {
fwrite($fp, @fgets($fs, 4096));
}
fwrite($fp, "\n\n");
fclose($fp);
*/
fclose($fs);
}
}
}
// extract the error code and message, then make the error code readable
if ( preg_match("/<error>[\r\n\t ]*(\d+)[\r\n\t ]*<\/error>/", $result, $error) )
{
preg_match("/<message>(.*?)<\/message>/", $result, $error_message);
$message = isset($error_message[1]) ? $error_message[1] : '';
switch ($error[1]) {
case '0':
$result_message = '[' . T_('Succeeded') . '] ' . $message;
break;
case '1':
$result_message = '[' . T_('Failed') . '] ' . $message;
break;
default:
$result_message = '[' . T_('Unknown error') . ' (' . $error[1] . ')] ' . $message;
break;
}
}
else
{
$result_message = T_('No valid trackback response. Maybe the given url is not a Trackback url.') . ' "' . $result . '"';
}
$Messages->add( T_('Response').': '.strip_tags($result_message), 'note' );
return $result;
}
/**
* @deprecated deprecated by {@link Item::feedback_link()}
*/
function trackback_number( $zero='#', $one='#', $more='#', $post_ID = NULL )
{
if( $zero == '#' ) $zero = T_('Trackback (0)');
if( $one == '#' ) $one = T_('Trackback (1)');
if( $more == '#' ) $more = T_('Trackbacks (%d)');
if( empty( $post_ID ) )
{
global $id;
$post_ID = $id;
}
$number = generic_ctp_number($post_ID, 'trackbacks');
if ($number == 0) {
$blah = $zero;
} elseif ($number == 1) {
$blah = $one;
} elseif ($number > 1) {
$n = $number;
$more = str_replace('%d', $n, $more);
$blah = $more;
}
echo $blah;
}
?>