silverstripe-framework/core/control/ContentNegotiator.php

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<?php
/**
* The content negotiator performs text/html or application/xhtml+xml switching.
* It does this through the static function ContentNegotiator::process()
*
* @todo Improve documentation
* @package sapphire
* @subpackage control
*/
class ContentNegotiator {
protected static $encoding = 'utf-8';
/**
* Set the character set encoding for this page. By default it's utf-8, but you could change it to, say, windows-1252, to
* improve interoperability with extended characters being imported from windows excel.
*/
static function set_encoding($encoding) {
self::$encoding = $encoding;
}
/**
* Return the character encoding set bhy ContentNegotiator::set_encoding(). It's recommended that all classes that need to
* specify the character set make use of this function.
*/
static function get_encoding() {
return self::$encoding;
}
static function process(HTTPResponse $response) {
if(self::$disabled) return;
$mimes = array(
"xhtml" => "application/xhtml+xml",
"html" => "text/html",
);
$q = array();
if(headers_sent()) {
$chosenFormat = "html";
} else if(isset($_GET['forceFormat'])) {
$chosenFormat = $_GET['forceFormat'];
} else {
// The W3C validator doesn't send an HTTP_ACCEPT header, but it can support xhtml. We put this special case in here so that
// designers don't get worried that their templates are HTML4.
if(isset($_SERVER['HTTP_USER_AGENT']) && substr($_SERVER['HTTP_USER_AGENT'], 0, 14) == 'W3C_Validator/') {
$chosenFormat = "xhtml";
} else {
foreach($mimes as $format => $mime) {
$regExp = '/' . str_replace(array('+','/'),array('\+','\/'), $mime) . '(;q=(\d+\.\d+))?/i';
if (isset($_SERVER['HTTP_ACCEPT']) && preg_match($regExp, $_SERVER['HTTP_ACCEPT'], $matches)) {
$preference = isset($matches[2]) ? $matches[2] : 1;
if(!isset($q[$preference])) $q[$preference] = $format;
}
}
if($q) {
// Get the preferred format
krsort($q);
$chosenFormat = reset($q);
} else {
$chosenFormat = "html";
}
}
}
$negotiator = new ContentNegotiator();
$negotiator->$chosenFormat( $response );
}
function xhtml(HTTPResponse $response) {
$content = $response->getBody();
// Only serve "pure" XHTML if the XML header is present
if(substr($content,0,5) == '<' . '?xml' ) {
$response->addHeader("Content-type", "application/xhtml+xml; charset=" . self::$encoding);
$response->addHeader("Vary" , "Accept");
$content = str_replace('&nbsp;','&#160;', $content);
$content = str_replace('<br>','<br />', $content);
$content = eregi_replace('(<img[^>]*[^/>])>','\\1/>', $content);
$response->setBody($content);
} else {
return $this->html($response);
}
}
function html(HTTPResponse $response) {
$response->addHeader("Content-type", "text/html; charset=" . self::$encoding);
$response->addHeader("Vary", "Accept");
$content = $response->getBody();
$content = ereg_replace("<\\?xml[^>]+\\?>\n?",'',$content);
$content = str_replace(array('/>','xml:lang','application/xhtml+xml'),array('>','lang','text/html'), $content);
$content = ereg_replace('<!DOCTYPE[^>]+>', '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">', $content);
$content = ereg_replace('<html xmlns="[^"]+"','<html ', $content);
$response->setBody($content);
}
protected static $disabled;
static function disable() {
self::$disabled = true;
}
}
?>