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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
/**
* HTTP
*
* PHP versions 4 and 5
*
* @category HTTP
* @package HTTP
* @author Stig Bakken <ssb@fast.no>
* @author Sterling Hughes <sterling@php.net>
* @author Tomas V.V.Cox <cox@idecnet.com>
* @author Richard Heyes <richard@php.net>
* @author Philippe Jausions <Philippe.Jausions@11abacus.com>
* @author Michael Wallner <mike@php.net>
* @copyright 2002-2005 The Authors
* @license BSD, revised
* @version CVS: $Id: HTTP.php,v 1.48 2005/11/08 20:11:54 mike Exp $
* @link http://pear.php.net/package/HTTP
*/
/**
* Miscellaneous HTTP Utilities
*
* PEAR::HTTP provides static shorthand methods for generating HTTP dates,
* issueing HTTP HEAD requests, building absolute URIs, firing redirects and
* negotiating user preferred language.
*
* @package HTTP
* @category HTTP
* @access public
* @static
* @version $Revision: 1.48 $
*/
class HTTP
{
/**
* Date
*
* Format a RFC compliant GMT date HTTP header. This function honors the
* "y2k_compliance" php.ini directive and formats the GMT date corresponding
* to either RFC850 or RFC822.
*
* @static
* @access public
* @return mixed GMT date string, or false for an invalid $time parameter
* @param mixed $time unix timestamp or date (default = current time)
*/
function Date($time = null)
{
if (!isset($time)) {
$time = time();
} elseif (!is_numeric($time) && (-1 === $time = strtotime($time))) {
return false;
}
// RFC822 or RFC850
$format = ini_get('y2k_compliance') ? 'D, d M Y' : 'l, d-M-y';
return gmdate($format .' H:i:s \G\M\T', $time);
}
/**
* Negotiate Language
*
* Negotiate language with the user's browser through the Accept-Language
* HTTP header or the user's host address. Language codes are generally in
* the form "ll" for a language spoken in only one country, or "ll-CC" for a
* language spoken in a particular country. For example, U.S. English is
* "en-US", while British English is "en-UK". Portugese as spoken in
* Portugal is "pt-PT", while Brazilian Portugese is "pt-BR".
*
* Quality factors in the Accept-Language: header are supported, e.g.:
* Accept-Language: en-UK;q=0.7, en-US;q=0.6, no, dk;q=0.8
*
* <code>
* require_once 'HTTP.php';
* $langs = array(
* 'en' => 'locales/en',
* 'en-US'=> 'locales/en',
* 'en-UK'=> 'locales/en',
* 'de' => 'locales/de',
* 'de-DE'=> 'locales/de',
* 'de-AT'=> 'locales/de',
* );
* $neg = HTTP::negotiateLanguage($langs);
* $dir = $langs[$neg];
* </code>
*
* @static
* @access public
* @return string The negotiated language result or the supplied default.
* @param array $supported An associative array of supported languages,
* whose values must evaluate to true.
* @param string $default The default language to use if none is found.
*/
function negotiateLanguage($supported, $default = 'en-US')
{
$supp = array();
foreach ($supported as $lang => $isSupported) {
if ($isSupported) {
$supp[strToLower($lang)] = $lang;
}
}
if (!count($supp)) {
return $default;
}
$matches = array();
if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
foreach (explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE']) as $lang) {
$lang = array_map('trim', explode(';', $lang));
if (isset($lang[1])) {
$l = strtolower($lang[0]);
$q = (float) str_replace('q=', '', $lang[1]);
} else {
$l = strtolower($lang[0]);
$q = null;
}
if (isset($supp[$l])) {
$matches[$l] = isset($q) ? $q : 1000 - count($matches);
}
}
}
if (count($matches)) {
asort($matches, SORT_NUMERIC);
return $supp[end($l = array_keys($matches))];
}
if (isset($_SERVER['REMOTE_HOST'])) {
$lang = strtolower(end($h = explode('.', $_SERVER['REMOTE_HOST'])));
if (isset($supp[$lang])) {
return $supp[$lang];
}
}
return $default;
}
/**
* Head
*
* Sends a "HEAD" HTTP command to a server and returns the headers
* as an associative array. Example output could be:
* <code>
* Array
* (
* [response_code] => 200 // The HTTP response code
* [response] => HTTP/1.1 200 OK // The full HTTP response string
* [Date] => Fri, 11 Jan 2002 01:41:44 GMT
* [Server] => Apache/1.3.20 (Unix) PHP/4.1.1
* [X-Powered-By] => PHP/4.1.1
* [Connection] => close
* [Content-Type] => text/html
* )
* </code>
*
* @see HTTP_Client::head()
* @see HTTP_Request
*
* @static
* @access public
* @return mixed Returns associative array of response headers on success
* or PEAR error on failure.
* @param string $url A valid URL, e.g.: http://pear.php.net/credits.php
* @param integer $timeout Timeout in seconds (default = 10)
*/
function head($url, $timeout = 10)
{
$p = parse_url($url);
if (!isset($p['scheme'])) {
$p = parse_url(HTTP::absoluteURI($url));
} elseif ($p['scheme'] != 'http') {
return HTTP::raiseError('Unsupported protocol: '. $p['scheme']);
}
$port = isset($p['port']) ? $p['port'] : 80;
if (!$fp = @fsockopen($p['host'], $port, $eno, $estr, $timeout)) {
return HTTP::raiseError("Connection error: $estr ($eno)");
}
$path = !empty($p['path']) ? $p['path'] : '/';
$path .= !empty($p['query']) ? '?' . $p['query'] : '';
fputs($fp, "HEAD $path HTTP/1.0\r\n");
fputs($fp, 'Host: ' . $p['host'] . ':' . $port . "\r\n");
fputs($fp, "Connection: close\r\n\r\n");
$response = rtrim(fgets($fp, 4096));
if (preg_match("|^HTTP/[^\s]*\s(.*?)\s|", $response, $status)) {
$headers['response_code'] = $status[1];
}
$headers['response'] = $response;
while ($line = fgets($fp, 4096)) {
if (!trim($line)) {
break;
}
if (($pos = strpos($line, ':')) !== false) {
$header = substr($line, 0, $pos);
$value = trim(substr($line, $pos + 1));
$headers[$header] = $value;
}
}
fclose($fp);
return $headers;
}
/**
* Redirect
*
* This function redirects the client. This is done by issuing
* a "Location" header and exiting if wanted. If you set $rfc2616 to true
* HTTP will output a hypertext note with the location of the redirect.
*
* @static
* @access public
* @return mixed Returns true on succes (or exits) or false if headers
* have already been sent.
* @param string $url URL where the redirect should go to.
* @param bool $exit Whether to exit immediately after redirection.
* @param bool $rfc2616 Wheter to output a hypertext note where we're
* redirecting to (Redirecting to <a href="...">...</a>.)
*/
function redirect($url, $exit = true, $rfc2616 = false)
{
if (headers_sent()) {
return false;
}
$url = HTTP::absoluteURI($url);
header('Location: '. $url);
if ( $rfc2616 && isset($_SERVER['REQUEST_METHOD']) &&
$_SERVER['REQUEST_METHOD'] != 'HEAD') {
printf('Redirecting to: <a href="%s">%s</a>.', $url, $url);
}
if ($exit) {
exit;
}
return true;
}
/**
* Absolute URI
*
* This function returns the absolute URI for the partial URL passed.
* The current scheme (HTTP/HTTPS), host server, port, current script
* location are used if necessary to resolve any relative URLs.
*
* Offsets potentially created by PATH_INFO are taken care of to resolve
* relative URLs to the current script.
*
* You can choose a new protocol while resolving the URI. This is
* particularly useful when redirecting a web browser using relative URIs
* and to switch from HTTP to HTTPS, or vice-versa, at the same time.
*
* @author Philippe Jausions <Philippe.Jausions@11abacus.com>
* @static
* @access public
* @return string The absolute URI.
* @param string $url Absolute or relative URI the redirect should go to.
* @param string $protocol Protocol to use when redirecting URIs.
* @param integer $port A new port number.
*/
function absoluteURI($url = null, $protocol = null, $port = null)
{
// filter CR/LF
$url = str_replace(array("\r", "\n"), ' ', $url);
// Mess around with already absolute URIs
if (preg_match('!^([a-z0-9]+)://!i', $url)) {
if (empty($protocol) && empty($port)) {
return $url;
}
if (!empty($protocol)) {
$url = $protocol .':'. end($array = explode(':', $url, 2));
}
if (!empty($port)) {
$url = preg_replace('!^(([a-z0-9]+)://[^/:]+)(:[\d]+)?!i',
'\1:'. $port, $url);
}
return $url;
}
$host = 'localhost';
if (!empty($_SERVER['HTTP_HOST'])) {
list($host) = explode(':', $_SERVER['HTTP_HOST']);
} elseif (!empty($_SERVER['SERVER_NAME'])) {
list($host) = explode(':', $_SERVER['SERVER_NAME']);
}
if (empty($protocol)) {
if (isset($_SERVER['HTTPS']) && !strcasecmp($_SERVER['HTTPS'], 'on')) {
$protocol = 'https';
} else {
$protocol = 'http';
}
if (!isset($port) || $port != intval($port)) {
$port = isset($_SERVER['SERVER_PORT']) ? $_SERVER['SERVER_PORT'] : 80;
}
}
if ($protocol == 'http' && $port == 80) {
unset($port);
}
if ($protocol == 'https' && $port == 443) {
unset($port);
}
$server = $protocol .'://'. $host . (isset($port) ? ':'. $port : '');
if (!strlen($url)) {
$url = isset($_SERVER['REQUEST_URI']) ?
$_SERVER['REQUEST_URI'] : $_SERVER['PHP_SELF'];
}
if ($url{0} == '/') {
return $server . $url;
}
// Check for PATH_INFO
if (isset($_SERVER['PATH_INFO']) && strlen($_SERVER['PATH_INFO']) &&
$_SERVER['PHP_SELF'] != $_SERVER['PATH_INFO']) {
$path = dirname(substr($_SERVER['PHP_SELF'], 0, -strlen($_SERVER['PATH_INFO'])));
} else {
$path = dirname($_SERVER['PHP_SELF']);
}
if (substr($path = strtr($path, '\\', '/'), -1) != '/') {
$path .= '/';
}
return $server . $path . $url;
}
/**
* Raise Error
*
* Lazy raising of PEAR_Errors.
*
* @static
* @access protected
* @return object PEAR_Error
* @param mixed $error
* @param int $code
*/
function raiseError($error = null, $code = null)
{
require_once 'PEAR.php';
return PEAR::raiseError($error, $code);
}
}
?>
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