<?php

namespace Symfony\Component\HttpFoundation;

class ServerBag extends ParameterBag
{
    public function getHeaders()
    {
        $headers = array();
        foreach ($this->parameters as $key => $value) {
            if (0 === strpos($key, 'HTTP_')) {
                $headers[substr($key, 5)] = $value;
            }
            // CONTENT_* are not prefixed with HTTP_
            elseif (in_array($key, array('CONTENT_LENGTH', 'CONTENT_MD5', 'CONTENT_TYPE'))) {
                $headers[$key] = $value;
            }
        }

        if (isset($this->parameters['PHP_AUTH_USER'])) {
            $headers['PHP_AUTH_USER'] = $this->parameters['PHP_AUTH_USER'];
            $headers['PHP_AUTH_PW'] = isset($this->parameters['PHP_AUTH_PW']) ? $this->parameters['PHP_AUTH_PW'] : '';
        } else {

            $authorizationHeader = null;
            if (isset($this->parameters['HTTP_AUTHORIZATION'])) {
                $authorizationHeader = $this->parameters['HTTP_AUTHORIZATION'];
            } elseif (isset($this->parameters['REDIRECT_HTTP_AUTHORIZATION'])) {
                $authorizationHeader = $this->parameters['REDIRECT_HTTP_AUTHORIZATION'];
            }

            // Decode AUTHORIZATION header into PHP_AUTH_USER and PHP_AUTH_PW when authorization header is basic
            if ((null !== $authorizationHeader) && (0 === stripos($authorizationHeader, 'basic'))) {
                $exploded = explode(':', base64_decode(substr($authorizationHeader, 6)));
                if (count($exploded) == 2) {
                    list($headers['PHP_AUTH_USER'], $headers['PHP_AUTH_PW']) = $exploded;
                }
            }
        }

        // PHP_AUTH_USER/PHP_AUTH_PW
        if (isset($headers['PHP_AUTH_USER'])) {
            $headers['AUTHORIZATION'] = 'Basic '.base64_encode($headers['PHP_AUTH_USER'].':'.$headers['PHP_AUTH_PW']);
        }

        return $headers;
    }
}