<?PHP
// File: $Id: modify_config.php,v 1.7 2001/12/02 16:59:42 niceguyeddie Exp $ $Name:  $
// ----------------------------------------------------------------------
// POST-NUKE Content Management System
// Copyright (C) 2001 by the Post-Nuke Development Team.
// http://www.postnuke.com/
// ----------------------------------------------------------------------
// Based on:
// PHP-NUKE Web Portal System - http://phpnuke.org/
// Thatware - http://thatware.org/
// ----------------------------------------------------------------------
// LICENSE
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License (GPL)
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// To read the license please visit http://www.gnu.org/copyleft/gpl.html
// ----------------------------------------------------------------------
// Original Author of file: Scott Kirkwood (hide@address.com)
// Purpose of file: Routines to modify the config.php file.
// General routine modify_file() is useful in it's own right.
// ----------------------------------------------------------------------
// This is the last update to this script before the new version is finished.

// mod_file is general, give it a source file a destination.
// an array of search patterns (Perl style) and replacement patterns
// Returns a string which starts with "Err" if there's an error
// TODO: internationalize the error messages?
function modify_file($src, $dest, $reg_src, $reg_rep)
{
    $in = @fopen($src, "r");
    if (! $in)
    {
        return "Error: unable to open $src for read";
    }
    
    $out = @fopen($dest, "w");
    if (! $out)
    {
        return "Error: unable to open $dest for write";
    }

    $lines = 0; // Keep track of the number of lines changed
    
    while (!feof($in))
    {
        $buffer = fgets($in, 4096);
        
        $new = preg_replace($reg_src, $reg_rep, $buffer);
        
        if ($new != $buffer)
        {
            $lines++;
        }
        
        fputs($out, $new);
    }
    
    fclose($in);
    fclose($out);
    
    if ($lines == 0) 
    {
        // Skip the rest - no lines changed
        return "0 lines changed, did nothing";
    }
    
    $swap = 'tmp-' . $src;
    
    // Rename the current file to the swap filename, permissions kept.
    if (! @rename($src, $swap))
    {
        return "Error: unable to rename $src to $swap. Please overwrite $dest as $src manually left in folder.";
    }
    
    // Rename the newly created file to the final filename ($src). Permissions are probably 666?
    if (! @rename($dest, $src))
    {
        return "Error: unable to rename $dest to $src. Please do manually.";
    }
    
    // Rename $swap to $dest
    if (! @rename($swap, $dest))
    {
        return "Error: unable to rename $swap to $dest. File named $swap left behind by operation.";
    }
    
     // Success!
    return "$src updated with $lines lines of changes, backup is called $backup";
}

// Two global arrays
$reg_src = array();
$reg_rep = array();

// Setup various searches and replaces
// Scott Kirkwood
function add_src_rep($key, $rep) 
{
    global $reg_src, $reg_rep;
    
    // Note: /x is to permit spaces in regular expressions
    // Great for making the reg expressions easier to read
    
    // Ex: $pnconfig['sitename'] = stripslashes("Your Site Name");
    $reg_src[] = "/ \['$key'\] \s* = \s* stripslashes\( (\' | \") (.*) \\1 \); /x";
    $reg_rep[] = "['$key'] = stripslashes(\\1$rep\\1);";
    
    // Ex. $pnconfig['site_logo'] = "logo.gif";
    $reg_src[] = "/ \['$key'\] \s* = \s* (\' | \") (.*) \\1 ; /x";
    $reg_rep[] = "['$key'] = '$rep';";
    
    // Ex. $pnconfig['pollcomm'] = 1;
    $reg_src[] = "/ \['$key'\] \s* = \s* (\d*\.?\d*) ; /x";
    $reg_rep[] = "['$key'] = $rep;";
}

function show_error_info()
{
    global $dbhost, $dbuname, $dbpass, $dbname, $prefix, $dbtype;

echo <<< EOT
        <br/><br/>
        <b>Write error</b> unable to update your "config.php"  file<br/>
        You will have to modify this file yourself using a text editor.<br/>
        Here are the changes required:<br/>
        <tt>
        \$pnconfig['dbtype'] = '$dbtype';<br/>
        \$pnconfig['dbhost']  = '$dbhost';<br/>
        \$pnconfig['dbuname'] = '$dbuname';<br/>
        \$pnconfig['dbpass'] = '$dbpass';<br/>
        \$pnconfig['dbname'] = '$dbname';<br/>
        \$pnconfig['prefix'] = '$prefix';<br/>
        </tt>
EOT;

}

// Update the config.php file with the database information.
function update_config_php($db_prefs = false)
{
    global $reg_src, $reg_rep;
    global $dbhost, $dbuname, $dbpass, $dbname, $prefix, $dbtype;
    global $email, $url,  $HTTP_ENV_VARS;

    add_src_rep("dbhost", $dbhost);
    add_src_rep("dbuname", base64_encode($dbuname));
    add_src_rep("dbpass", base64_encode($dbpass));
    add_src_rep("dbname", $dbname);
    add_src_rep("prefix", $prefix);
    add_src_rep("dbtype", $dbtype);
    if (strstr($HTTP_ENV_VARS["OS"],"Win")) {
        add_src_rep("system" , '1');
    } else {
        add_src_rep("system", '0');
    }
    add_src_rep("encoded", '1');
    
    if ($email)
    {
        add_src_rep("adminmail", $email);
    }
    if ($url)
    {
        add_src_rep("nukeurl", $url);
    }
    
    $ret = modify_file("config.php", "config-old.php", $reg_src, $reg_rep);
    
    if (preg_match("/Error/", $ret)) 
    {
        show_error_info();
    }
}

?>