2007-07-19 12:40:28 +02:00
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<?php
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/**
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* The content negotiator performs text/html or application/xhtml+xml switching.
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* It does this through the static function ContentNegotiator::process()
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2008-03-03 00:24:10 +01:00
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*
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* @todo Improve documentation
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2008-02-25 03:10:37 +01:00
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* @package sapphire
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* @subpackage control
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2007-07-19 12:40:28 +02:00
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*/
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class ContentNegotiator {
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protected static $encoding = 'utf-8';
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/**
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* Set the character set encoding for this page. By default it's utf-8, but you could change it to, say, windows-1252, to
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* improve interoperability with extended characters being imported from windows excel.
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*/
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static function set_encoding($encoding) {
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self::$encoding = $encoding;
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}
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/**
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* Return the character encoding set bhy ContentNegotiator::set_encoding(). It's recommended that all classes that need to
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* specify the character set make use of this function.
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*/
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static function get_encoding() {
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return self::$encoding;
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}
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2007-08-17 05:09:46 +02:00
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static function process(HTTPResponse $response) {
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if(self::$disabled) return;
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2007-07-19 12:40:28 +02:00
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$mimes = array(
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"xhtml" => "application/xhtml+xml",
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"html" => "text/html",
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);
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$q = array();
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if(headers_sent()) {
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$chosenFormat = "html";
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} else if(isset($_GET['forceFormat'])) {
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$chosenFormat = $_GET['forceFormat'];
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} else {
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2008-02-25 03:10:37 +01:00
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// The W3C validator doesn't send an HTTP_ACCEPT header, but it can support xhtml. We put this special case in here so that
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// designers don't get worried that their templates are HTML4.
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if(isset($_SERVER['HTTP_USER_AGENT']) && substr($_SERVER['HTTP_USER_AGENT'], 0, 14) == 'W3C_Validator/') {
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$chosenFormat = "xhtml";
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} else {
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foreach($mimes as $format => $mime) {
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$regExp = '/' . str_replace(array('+','/'),array('\+','\/'), $mime) . '(;q=(\d+\.\d+))?/i';
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if (isset($_SERVER['HTTP_ACCEPT']) && preg_match($regExp, $_SERVER['HTTP_ACCEPT'], $matches)) {
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$preference = isset($matches[2]) ? $matches[2] : 1;
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if(!isset($q[$preference])) $q[$preference] = $format;
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}
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2007-07-19 12:40:28 +02:00
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}
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2008-02-25 03:10:37 +01:00
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if($q) {
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// Get the preferred format
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krsort($q);
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$chosenFormat = reset($q);
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} else {
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$chosenFormat = "html";
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}
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2007-07-19 12:40:28 +02:00
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}
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}
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$negotiator = new ContentNegotiator();
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2007-08-17 05:09:46 +02:00
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$negotiator->$chosenFormat( $response );
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2007-07-19 12:40:28 +02:00
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}
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2007-08-17 05:09:46 +02:00
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function xhtml(HTTPResponse $response) {
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$content = $response->getBody();
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2007-07-19 12:40:28 +02:00
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// Only serve "pure" XHTML if the XML header is present
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2007-08-17 05:09:46 +02:00
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if(substr($content,0,5) == '<' . '?xml' ) {
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$response->addHeader("Content-type", "application/xhtml+xml; charset=" . self::$encoding);
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$response->addHeader("Vary" , "Accept");
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2007-07-19 12:40:28 +02:00
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$content = str_replace(' ',' ', $content);
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$content = str_replace('<br>','<br />', $content);
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$content = eregi_replace('(<img[^>]*[^/>])>','\\1/>', $content);
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2007-08-17 05:09:46 +02:00
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$response->setBody($content);
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2007-07-19 12:40:28 +02:00
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} else {
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2007-08-17 05:09:46 +02:00
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return $this->html($response);
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2007-07-19 12:40:28 +02:00
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}
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}
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2007-08-17 05:09:46 +02:00
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function html(HTTPResponse $response) {
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$response->addHeader("Content-type", "text/html; charset=" . self::$encoding);
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$response->addHeader("Vary", "Accept");
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$content = $response->getBody();
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2007-07-19 12:40:28 +02:00
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$content = ereg_replace("<\\?xml[^>]+\\?>\n?",'',$content);
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$content = str_replace(array('/>','xml:lang','application/xhtml+xml'),array('>','lang','text/html'), $content);
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$content = ereg_replace('<!DOCTYPE[^>]+>', '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">', $content);
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$content = ereg_replace('<html xmlns="[^"]+"','<html ', $content);
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2007-08-17 05:09:46 +02:00
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$response->setBody($content);
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2007-07-19 12:40:28 +02:00
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}
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protected static $disabled;
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static function disable() {
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self::$disabled = true;
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}
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}
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?>
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