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<?php

/**
 * MvcCore
 *
 * This source file is subject to the BSD 3 License
 * For the full copyright and license information, please view 
 * the LICENSE.md file that are distributed with this source code.
 *
 * @copyright   Copyright (c) 2016 Tom Flídr (https://github.com/mvccore/mvccore)
 * @license     https://mvccore.github.io/docs/mvccore/4.0.0/LICENCE.md
 */

namespace MvcCore\Ext\Request;

class ApacheDpi extends \MvcCore\Request
{
    /**
     * MvcCore Extension - Request ApacheDpi - version:
     * Comparation by PHP function version_compare();
     * @see http://php.net/manual/en/function.version-compare.php
     */
    const VERSION = '4.2.0';
    /**
     * If there is used somewhere in .htaccess files structure any [DPI] flag
     * end request is dispatched to another .htaccess with "discard path",
     * there is necessary to complete request base path property more deeply.
     * @see http://httpd.apache.org/docs/current/rewrite/flags.html#flag_dpi
     * @return void
     */
    protected function initBasePath () {
        parent::initBasePath();
        /**
         * It's necessary to complete this variable in .htaccess in redirection line by something like:
         * RewriteCond %{HTTP_HOST}%{REQUEST_URI} ^([^/]*)x/(.*)([^/])$
         * RewriteCond %{DOCUMENT_ROOT}/domains/%1/%2%3 -d
         * RewriteRule (.*) %{ENV:HTTP_PROTOCOL}//%1/%2%3/ [R=301,QSA,L,NE,E=REDIRECT_PATH:/domains/%1]
         */
        $currentKey = 'REDIRECT_PATH';
        $i = 0;
        while ($i < 5) {
            if (isset($this->serverGlobals[$currentKey])) {
                $redirectPath = $this->serverGlobals[$currentKey];
                if (mb_strpos($this->BasePath, $redirectPath) === 0) {
                    $this->BasePath = mb_substr($this->BasePath, mb_strlen($redirectPath));
                }
                break;
            } else {
                $currentKey = 'REDIRECT_' . $currentKey;
            }
            $i += 1;
        }
    }
}