2013-04-04 09:26:00 +00:00
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<?php defined("SYSPATH") or die("No direct script access.");
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/**
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* Gallery - a web based photo album viewer and editor
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2013-04-04 09:26:04 +00:00
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* Copyright (C) 2000-2012 Bharat Mediratta
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2013-04-04 09:26:00 +00:00
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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class remote extends remote_Core {
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static function post($url, $post_data_array, $extra_headers=array()) {
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$post_data_raw = self::_encode_post_data($post_data_array, $extra_headers);
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/* Read the web page into a buffer */
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list ($response_status, $response_headers, $response_body) =
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remote::do_request($url, 'POST', $extra_headers, $post_data_raw);
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return array($response_body, $response_status, $response_headers);
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}
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static function success($response_status) {
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return preg_match("/^HTTP\/\d+\.\d+\s2\d{2}(\s|$)/", trim($response_status));
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}
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/**
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* Encode the post data. For each key/value pair, urlencode both the key and the value and then
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* concatenate together. As per the specification, each key/value pair is separated with an
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* ampersand (&)
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* @param array $post_data_array the key/value post data
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* @param array $extra_headers extra headers to pass to the server
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* @return string the encoded post data
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*/
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private static function _encode_post_data($post_data_array, &$extra_headers) {
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$post_data_raw = '';
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foreach ($post_data_array as $key => $value) {
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if (!empty($post_data_raw)) {
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$post_data_raw .= '&';
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}
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$post_data_raw .= urlencode($key) . '=' . urlencode($value);
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}
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$extra_headers['Content-Type'] = 'application/x-www-form-urlencoded';
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$extra_headers['Content-Length'] = strlen($post_data_raw);
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return $post_data_raw;
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}
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/**
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* A single request, without following redirects
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*
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* @todo: Handle redirects? If so, only for GET (i.e. not for POST), and use G2's
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* WebHelper_simple::_parseLocation logic.
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*/
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static function do_request($url, $method='GET', $headers=array(), $body='') {
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if (!array_key_exists("User-Agent", $headers)) {
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$headers["User-Agent"] = "Gallery3";
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}
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/* Convert illegal characters */
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$url = str_replace(' ', '%20', $url);
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$url_components = self::_parse_url_for_fsockopen($url);
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$handle = fsockopen(
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$url_components['fsockhost'], $url_components['port'], $errno, $errstr, 5);
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if (empty($handle)) {
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// log "Error $errno: '$errstr' requesting $url";
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return array(null, null, null);
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}
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$header_lines = array('Host: ' . $url_components['host']);
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foreach ($headers as $key => $value) {
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$header_lines[] = $key . ': ' . $value;
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}
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$success = fwrite($handle, sprintf("%s %s HTTP/1.0\r\n%s\r\n\r\n%s",
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$method,
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$url_components['uri'],
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implode("\r\n", $header_lines),
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$body));
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if (!$success) {
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// Zero bytes written or false was returned
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// log "fwrite failed in requestWebPage($url)" . ($success === false ? ' - false' : ''
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return array(null, null, null);
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}
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fflush($handle);
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/*
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* Read the status line. fgets stops after newlines. The first line is the protocol
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* version followed by a numeric status code and its associated textual phrase.
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*/
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$response_status = trim(fgets($handle, 4096));
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if (empty($response_status)) {
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// 'Empty http response code, maybe timeout'
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return array(null, null, null);
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}
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/* Read the headers */
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$response_headers = array();
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while (!feof($handle)) {
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$line = trim(fgets($handle, 4096));
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if (empty($line)) {
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break;
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}
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/* Normalize the line endings */
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$line = str_replace("\r", '', $line);
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list ($key, $value) = explode(':', $line, 2);
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if (isset($response_headers[$key])) {
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if (!is_array($response_headers[$key])) {
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$response_headers[$key] = array($response_headers[$key]);
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}
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$response_headers[$key][] = trim($value);
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} else {
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$response_headers[$key] = trim($value);
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}
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}
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/* Read the body */
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$response_body = '';
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while (!feof($handle)) {
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$response_body .= fread($handle, 4096);
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}
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fclose($handle);
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return array($response_status, $response_headers, $response_body);
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}
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/**
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* Prepare for fsockopen call.
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* @param string $url
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* @return array url components
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* @access private
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*/
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private static function _parse_url_for_fsockopen($url) {
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$url_components = parse_url($url);
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if (strtolower($url_components['scheme']) == 'https') {
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$url_components['fsockhost'] = 'ssl://' . $url_components['host'];
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$default_port = 443;
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} else {
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$url_components['fsockhost'] = $url_components['host'];
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$default_port = 80;
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}
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if (empty($url_components['port'])) {
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$url_components['port'] = $default_port;
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}
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if (empty($url_components['path'])) {
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$url_components['path'] = '/';
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}
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$uri = $url_components['path']
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. (empty($url_components['query']) ? '' : '?' . $url_components['query']);
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/* Unescape ampersands, since if the url comes from form input it will be escaped */
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$url_components['uri'] = str_replace('&', '&', $uri);
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return $url_components;
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}
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}
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