htaccess.class.php

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<?php
// $Id$
// --------------------------------------------------------------
// Red México Common Utilities
// A framework for Red México Modules
// Author: Eduardo Cortés <i.bitcero@gmail.com>
// Email: i.bitcero@gmail.com
// License: GPL 2.0
// --------------------------------------------------------------

class RMHtaccess
{
    private $rules = '';
    private $module = '';
    private $file = '';
    private $content = '';
    private $bCode = '';
    private $base = '/';
    private $apache = true;
    private $rewrite = true;

    function __construct($module){

        if(trim($module)=='')
            return false;

        $this->module = $module;
        $this->file = XOOPS_ROOT_PATH.'/.htaccess';

        if(strpos($_SERVER['SERVER_SOFTWARE'], 'Apache')!==FALSE){

            if(!file_exists($this->file))
                file_put_contents($this->file, '');

        }

        $this->content = file_get_contents($this->file);

        $this->checkHealth();

    }

    private function checkHealth(){

        if(strpos($_SERVER['SERVER_SOFTWARE'], 'Apache')===FALSE)
            $this->apache = false;

        if(function_exists('apache_get_modules')){
            $mods = apache_get_modules();
            if(!in_array('mod_rewrite', $mods))
                $this->rewrite = false;
        }

        if(!$this->apache || !$this->rewrite){
            showMessage(__('URL rewriting requires an Apache Server and mod_rewrite enabled!','dtransport'), RMMSG_WARN);
            return false;
        }

        if(!preg_match("/RewriteEngine\s{1,}On/", $this->content))
            $this->content .= "\nRewriteEngine On\n";

        $base = parse_url(XOOPS_URL.'/');
        $this->base = isset($base['path']) ? rtrim($base['path'], '/').'/' : '/';
        $rb = "RewriteBase ".$this->base."\n";

        if(strpos($this->content, $rb)===false){
            if(preg_match("/RewriteBase/", $this->content))
                preg_replace("/RewriteBase\s{1,}(.*)\n",$rb, $this->content);
            else
                $this->content .= $rb."\n";
        }

        if(!preg_match("/RewriteCond\s{1,}\%\{REQUEST_URI\}\s{1,}\!\/\[A\-Z\]\+\-/", $this->content))
            $this->content .= "RewriteCond %{REQUEST_URI} !/[A-Z]+-\n";

        if(!preg_match("/RewriteCond\s{1,}\%\{REQUEST_FILENAME\}\s{1,}\!\-f/", $this->content))
            $this->content .= "RewriteCond %{REQUEST_FILENAME} !-f\n";

        if(!preg_match("/RewriteCond\s{1,}\%\{REQUEST_FILENAME\}\s{1,}\!\-d/", $this->content))
            $this->content .= "RewriteCond %{REQUEST_FILENAME} !-d\n";



    }

    public function verifyCode($code = ''){

        if($code!=''){

            if(strpos($this->content, $code)!==FALSE)
                return true;
            else
                return false;

        }

        if(!preg_match("/\# begin $this->module\n(.*)\n\# end $this->module/i", $this->content, $match))
            return false;
        else
            return $match[0];

    }

    private function makeCode(){

        $code = "# begin $this->module\n$this->rules\n# end $this->module\n";
        return $code;

    }

    public function write($rules){

        if($rules=='') return false;

        if(!$this->apache || !$this->rewrite)
            return;

        $this->rules = $rules;
        $code = $this->makeCode($rules);

        // Verificamos si existe el código generado
        $exists = $this->verifyCode($code);
        $oldExists = false;

        if(!$exists){
            // Si no existe verificamos la existencia de código antiguo
            // para el módulo actual
            $oldExists = $this->verifyCode();
        } else {

            return true;

        }

        if(!is_writable($this->file))
            return $this->bCode.$code;

        if($oldExists!==false)
            $this->content = str_replace($oldExists, $code, $this->content);
        else
            $this->content .= "\n$code";

        if(file_put_contents($this->file, $this->content))
            return true;
        else
            return $code;

    }

}