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<?php defined("SYSPATH") or die("No direct script access.");
/**
* Gallery - a web based photo album viewer and editor
* Copyright (C) 2000-2013 Bharat Mediratta
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
*/
class remote extends remote_Core {
static function post($url, $post_data_array, $extra_headers=array()) {
$post_data_raw = self::_encode_post_data($post_data_array, $extra_headers);
/* Read the web page into a buffer */
list ($response_status, $response_headers, $response_body) =
remote::do_request($url, 'POST', $extra_headers, $post_data_raw);
return array($response_body, $response_status, $response_headers);
}
static function success($response_status) {
return preg_match("/^HTTP\/\d+\.\d+\s2\d{2}(\s|$)/", trim($response_status));
}
/**
* Encode the post data. For each key/value pair, urlencode both the key and the value and then
* concatenate together. As per the specification, each key/value pair is separated with an
* ampersand (&)
* @param array $post_data_array the key/value post data
* @param array $extra_headers extra headers to pass to the server
* @return string the encoded post data
*/
private static function _encode_post_data($post_data_array, &$extra_headers) {
$post_data_raw = '';
foreach ($post_data_array as $key => $value) {
if (!empty($post_data_raw)) {
$post_data_raw .= '&';
}
$post_data_raw .= urlencode($key) . '=' . urlencode($value);
}
$extra_headers['Content-Type'] = 'application/x-www-form-urlencoded';
$extra_headers['Content-Length'] = strlen($post_data_raw);
return $post_data_raw;
}
/**
* A single request, without following redirects
*
* @todo: Handle redirects? If so, only for GET (i.e. not for POST), and use G2's
* WebHelper_simple::_parseLocation logic.
*/
static function do_request($url, $method='GET', $headers=array(), $body='') {
if (!array_key_exists("User-Agent", $headers)) {
$headers["User-Agent"] = "Gallery3";
}
/* Convert illegal characters */
$url = str_replace(' ', '%20', $url);
$url_components = self::_parse_url_for_fsockopen($url);
$handle = fsockopen(
$url_components['fsockhost'], $url_components['port'], $errno, $errstr, 5);
if (empty($handle)) {
// log "Error $errno: '$errstr' requesting $url";
return array(null, null, null);
}
$header_lines = array('Host: ' . $url_components['host']);
foreach ($headers as $key => $value) {
$header_lines[] = $key . ': ' . $value;
}
$success = fwrite($handle, sprintf("%s %s HTTP/1.0\r\n%s\r\n\r\n%s",
$method,
$url_components['uri'],
implode("\r\n", $header_lines),
$body));
if (!$success) {
// Zero bytes written or false was returned
// log "fwrite failed in requestWebPage($url)" . ($success === false ? ' - false' : ''
return array(null, null, null);
}
fflush($handle);
/*
* Read the status line. fgets stops after newlines. The first line is the protocol
* version followed by a numeric status code and its associated textual phrase.
*/
$response_status = trim(fgets($handle, 4096));
if (empty($response_status)) {
// 'Empty http response code, maybe timeout'
return array(null, null, null);
}
/* Read the headers */
$response_headers = array();
while (!feof($handle)) {
$line = trim(fgets($handle, 4096));
if (empty($line)) {
break;
}
/* Normalize the line endings */
$line = str_replace("\r", '', $line);
list ($key, $value) = explode(':', $line, 2);
if (isset($response_headers[$key])) {
if (!is_array($response_headers[$key])) {
$response_headers[$key] = array($response_headers[$key]);
}
$response_headers[$key][] = trim($value);
} else {
$response_headers[$key] = trim($value);
}
}
/* Read the body */
$response_body = '';
while (!feof($handle)) {
$response_body .= fread($handle, 4096);
}
fclose($handle);
return array($response_status, $response_headers, $response_body);
}
/**
* Prepare for fsockopen call.
* @param string $url
* @return array url components
* @access private
*/
private static function _parse_url_for_fsockopen($url) {
$url_components = parse_url($url);
if (strtolower($url_components['scheme']) == 'https') {
$url_components['fsockhost'] = 'ssl://' . $url_components['host'];
$default_port = 443;
} else {
$url_components['fsockhost'] = $url_components['host'];
$default_port = 80;
}
if (empty($url_components['port'])) {
$url_components['port'] = $default_port;
}
if (empty($url_components['path'])) {
$url_components['path'] = '/';
}
$uri = $url_components['path']
. (empty($url_components['query']) ? '' : '?' . $url_components['query']);
/* Unescape ampersands, since if the url comes from form input it will be escaped */
$url_components['uri'] = str_replace('&', '&', $uri);
return $url_components;
}
}
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