/**
* HTTP Client
*
* Returns the raw data from the given URL, uses proxy when configured
* and follows redirects
*
* @author Andreas Goetz <*****@*****.**>
* @param string $url URL to fetch
* @param bool $cache use caching? defaults to false
* @param string $post POST data, if nonempty POST is used instead of GET
* @param integer $timeout Timeout in seconds defaults to 15
* @return mixed HTTP response
*/
function httpClient($url, $cache = false, $para = null, $reload = false)
{
global $config;
// use this as workaround for php bug http://bugs.php.net/bug.php?id=22526 session_start/popen hang
# session_write_close(); // <-- We don't use popen! But sometimes we need the session afterwards! (Chinamann)
$method = 'GET';
$headers = '';
// additional HTTP headers, used for post data
$post = $para['post'];
if (is_array($post)) {
$post = http_build_query($post);
}
if (!empty($post)) {
// POST request
$method = 'POST';
$headers .= "Content-Type: application/x-www-form-urlencoded\r\n";
$headers .= "Content-Length: " . strlen($post) . "\r\n";
}
// get data from cache?
if ($cache & !$reload) {
$resp = getHTTPcache($url . $post);
if ($resp !== false) {
$resp['cached'] = true;
return $resp;
}
}
$response['error'] = '';
$response['header'] = '';
$response['data'] = '';
$response['url'] = $url;
$response['success'] = false;
$uri = parse_url($url);
$server = $uri['host'];
$path = $uri['path'];
if (empty($path)) {
$path = '/';
}
if (!empty($uri['query'])) {
$path .= '?' . $uri['query'];
}
$port = @$uri['port'];
// proxy setup
if (!empty($config['proxy_host']) && !$para['no_proxy']) {
$request_url = $url;
$server = $config['proxy_host'];
$port = @$config['proxy_port'];
if (!$port) {
$port = 8080;
}
} else {
$request_url = $path;
// cpuidle@gmx.de: use $path instead of $url if HTTP/1.0
$server = $server;
if (!$port) {
$port = 80;
}
}
// open socket
$socket = fsockopen($server, $port);
if (!$socket) {
$response['error'] = "Could not connect to {$server}";
return $response;
}
stream_set_timeout($socket, $para['timeout'] ? $para['timeout'] : 10);
// build request
$request = "{$method} {$request_url} HTTP/1.0\r\n";
$request .= "Host: " . $uri['host'] . "\r\n";
$request .= "User-Agent: Mozilla/4.0 (compatible; MSIE 5.5; Windows 98)\r\n";
if (extension_loaded('zlib')) {
$request .= "Accept-encoding: gzip\r\n";
}
# $request .= "Accept-Charset: iso-8859-1, utf-8, *\r\n";
// add cookies- these are expcted to be in array form
if ($para['cookies']) {
$request .= cookies2header($para['cookies']);
}
$request .= "Connection: Close\r\n";
// additional request headers
$request .= $headers;
if ($para['header']) {
$request .= $para['header'];
}
$request .= "\r\n";
$request .= $post;
// send request
fputs($socket, $request);
if (@$config['debug']) {
echo "request:<br>" . nl2br($request) . "<p>";
}
// log request
if (@$config['httpclientlog']) {
$log = fopen('httpClient.log', 'a');
fwrite($log, $request . "\n");
fclose($log);
}
// read headers from socket
while (!(feof($socket) || preg_match('/\\r\\n\\r\\n$/', $response['header']))) {
$read = fgets($socket);
$response['header'] .= $read;
// $header_size += strlen($read);
}
// chunked encoding?
if (preg_match('/transfer\\-(en)?coding:\\s+chunked\\r\\n/i', $response['header'])) {
do {
unset($chunk_size);
do {
$byte = fread($socket, 1);
$chunk_size .= $byte;
} while (preg_match('/[a-zA-Z0-9]/', $byte));
// read chunksize including \r
$byte = fread($socket, 1);
// read trailing \n
$chunk_size = hexdec($chunk_size);
$this_chunk = fread($socket, $chunk_size);
$response['data'] .= $this_chunk;
if ($chunk_size) {
$byte = fread($socket, 2);
}
// read trailing \r\n
} while ($chunk_size);
} else {
// read entire socket
while (!feof($socket)) {
$response['data'] .= fread($socket, 4096);
}
}
// close socket
$status = socket_get_status($socket);
fclose($socket);
if (@$config['debug']) {
echo "header:<br>" . nl2br($response['header']) . "<p>";
}
// if ($config['debug']) echo "data:<br>".htmlspecialchars($response['data'])."<p>";
// check for timeout
if (@$status['timed_out']) {
$response['error'] = "Connection timed out";
return $response;
}
// log response
if (@$config['httpclientlog']) {
$log = fopen('httpClient.log', 'a');
fwrite($log, $response['header'] . "\n");
fclose($log);
}
// check server status code to follow redirect
if (preg_match("/^HTTP\\/1.\\d 30[12].*?\n/s", $response['header'])) {
preg_match("/Location:\\s+(.*?)\n/is", $response['header'], $matches);
if (empty($matches[1])) {
$response['error'] = 'Redirect but no Location header found';
return $response;
} else {
// in case no redirect is needed stop here and respond success
if ($para['no_redirect']) {
// save time if result is not needed
$response['error'] = '';
$response['success'] = true;
return $response;
}
// get redirection target
$location = trim($matches[1]);
if (preg_match("/^\\//", $location)) {
// local redirect
$location = 'http://' . $uri['host'] . ':' . $uri['port'] . $location;
} elseif (!preg_match('/^http/', $location)) {
// local redirect without path
$path = substr($uri['path'], 0, strrpos($uri['path'], '/') + 1);
$location = 'http://' . $uri['host'] . ':' . $uri['port'] . $path . $location;
}
// don't use old headers again
$headers = '';
// add new cookies from response
$para['cookies'] = get_cookies_from_response($response, $para['cookies']);
// perform redirected request; we must GET, not POST
if ($para['post']) {
unset($para['post']);
}
$response = httpClient($location, $cache, $para);
// remember we were redirected
$response['redirect'] = $location;
// store response a 2nd time under the the original post attributes
if ($response['success'] == true && $cache) {
putHTTPcache($url . $post, $response);
}
return $response;
}
}
// verify status code
if (!preg_match("/^.*? 200 .*?\n/s", $response['header'])) {
$response['error'] = 'Server returned wrong status.';
return $response;
}
$response['success'] = true;
// decode data if necessary- do not modify original headers
if (preg_match("/Content-Encoding:\\s+gzip\r?\n/i", $response['header'])) {
$response['data'] = gzinflate(substr($response['data'], 10));
}
// commit successful request to cache
if ($cache) {
putHTTPcache($url . $post, $response);
}
return $response;
}
function httpClient($url, $cache = 0, $post = '', $timeout = 15, $cookies = null, $headers2 = '', $omitProxy = false, $omitRedirect = false)
{
global $config;
// since we shouldn't don't need session functionality here,
// use this as workaround for php bug #22526 session_start/popen hang
session_write_close();
$method = 'GET';
$headers = '';
// additional HTTP headers, used for post data
if (!empty($post)) {
// POST request
$method = 'POST';
$headers .= "Content-Type: application/x-www-form-urlencoded\r\n";
$headers .= "Content-Length: " . strlen($post) . "\r\n";
}
$response['error'] = '';
$response['header'] = '';
$response['data'] = '';
$response['url'] = $url;
$response['success'] = false;
$uri = parse_url($url);
$server = $uri['host'];
$path = $uri['path'];
if (empty($path)) {
$path = '/';
}
#get root on empty path
if (!empty($uri['query'])) {
$path .= '?' . $uri['query'];
}
$port = @$uri['port'];
// proxy setup
if (!empty($config['proxy_host']) && !$omitProxy) {
$request_url = $url;
$server = $config['proxy_host'];
$port = $config['proxy_port'];
if (empty($port)) {
$port = 8080;
}
} else {
$request_url = $path;
// cpuidle@gmx.de: use $path instead of $url if HTTP/1.0
$server = $server;
if (empty($port)) {
$port = 80;
}
}
// print "<pre>$request_url</pre>";
// open socket
$socket = fsockopen($server, $port, $errno, $errstr, isset($config['connection_timeout']) ? $config['connection_timeout'] : 5);
if (!$socket) {
$response['error'] = "Could not connect to {$server}";
return $response;
}
socket_set_timeout($socket, $timeout);
// build request
$request = "{$method} {$request_url} HTTP/1.0\r\n";
$request .= "Host: " . $uri['host'] . "\r\n";
$request .= "User-Agent: Mozilla/4.0 (compatible; MSIE 5.5; Windows 98)\r\n";
// if (extension_loaded('zlib')) $request .= "Accept-encoding: gzip\r\n";
if ($cookies) {
$request .= cookies2header($cookies);
}
$request .= "Connection: Close\r\n";
$request .= $headers;
$request .= $headers2;
$request .= "\r\n";
$request .= $post;
// send request
fputs($socket, $request);
// read headers from socket
do {
$response['header'] .= fread($socket, 1);
} while (!preg_match('/\\r\\n\\r\\n$/', $response['header']) && !feof($socket));
// read entire socket
while (!feof($socket)) {
$response['data'] .= fread($socket, 4096);
}
// chunked encoding?
if (preg_match('/transfer\\-(en)?coding:\\s+chunked\\r\\n/i', $response['header'])) {
$data2 = "";
$pos = 0;
do {
unset($chunk_size);
do {
$cb = 1;
$byte = substr($response['data'], $pos, $cb);
$pos += $cb;
$chunk_size .= $byte;
} while (preg_match('/[a-zA-Z0-9]/', $byte));
// read chunksize including \r
while ($response['data'][$pos] != "\n") {
$pos++;
// readtrailing \n
}
$pos++;
// readtrailing \n
$chunk_size = hexdec($chunk_size);
$this_chunk = substr($response['data'], $pos, $chunk_size);
$pos += $chunk_size;
$data2 .= $this_chunk;
if ($chunk_size) {
$pos += 2;
}
// read trailing \r\n
} while ($chunk_size);
$response['data'] = $data2;
}
// close socket
$status = socket_get_status($socket);
fclose($socket);
// check for timeout
if ($status['timed_out']) {
$response['error'] = "Connection timed out";
return $response;
}
/* // verify status code
if (!preg_match("/^.*? 200 .*?\n/s", $response['header']))
{
$response['error'] = 'Server returned wrong status.';
return $response;
}*/
$response['success'] = true;
// decode data if necessary- do not modify original headers
if (preg_match("/Content-Encoding:\\s+gzip\r?\n/i", $response['header'])) {
$response['data'] = gzdecode($response['data']);
}
// decode UTF8
if (preg_match("/Content-Type:.*?charset=UTF-8/i", $response['header'])) {
$response['data'] = utf8_decode($response['data']);
}
return $response;
}
