<?php
/*
  SQLCONF.PHP                                             SQLconf v1.1
  -----------                                             ------------
  Copyright (C) 2003 by Max Timchenko    http://www.maxvt.com/sqlconf/
  
  Writing and reading configuration for your scripts has never been so 
  easy. Using MySQL as the backend and a minimal, automatically updated
  conf.php file, SQLconf provides a solution for all your configuration
  needs.
  
* This file:
  - This file implements the SQLconf.
  
* Functions:
  - getConf(module, name="")
    Returns a configuration value for a given module and variable name. 
    Your program is responsible for interpreting the value. 
    - If name is not set, all module values are read and returned as an
      array of (name, value) pairs.
    - If module/name does not exist, FALSE is returned.
      
  - setConf(module, name, value, exported=0)
    Sets the configuration value for a given module and variable name, 
    overwriting an existing value if the module/name existed.
    - If exported is set to 1, the variable will be written into conf.php
      file as a global define() with the name module_name (in uppercase).
   
  - clearConf(module, name)
    Removes the configuration value with the given module/name. If 
    exported was set to 1 for the value, conf.php will be recreated. 
    
  - regenConf()
    Recreates the configuration file. This function (normally) should not
    be called directly.  
  
* 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 
*/

require_once('conf.php');

// ------------------------------------------------------------ getConf()
function getConf ($module, $name = '') {
    mysql_connect(MYSQL_SERVER, MYSQL_USER, MYSQL_PASS)
        or die('Could not connect: '.mysql_error());
    mysql_select_db(MYSQL_DB);

    $query = "SELECT name, value FROM conf WHERE module='$module' ";
    if ($name != '') $query .= "AND name='$name'";
        
    $result = mysql_query($query)
        or die('Query failed: '.mysql_error());
    
    if ($name != '') 
        if (mysql_num_rows($result) == 1) {
            $row = mysql_fetch_row($result);
            return $row[1];
        }
        else return FALSE;
            
    // else, return an associative array for the module
    $ret = FALSE; 
    while ($row = mysql_fetch_row($result)) 
        $ret[$row[0]] = $row[1];
            
    return $ret;            
}

// ------------------------------------------------------------ setConf()
function setConf ($module, $name, $value, $exported = 0) {
    mysql_connect(MYSQL_SERVER, MYSQL_USER, MYSQL_PASS)
        or die('Could not connect: '.mysql_error());
    mysql_select_db(MYSQL_DB);
    
    $query = "REPLACE INTO conf VALUES".
             "('$module', '$name', '".mysql_escape_string($value).
             "', '$exported')";    
    $result = mysql_query($query)
        or die('Query failed: '.mysql_error());
    
    if ($exported == 1)
        regenConf();
}

// ---------------------------------------------------------- clearConf()
function clearConf($module, $name) {
    mysql_connect(MYSQL_SERVER, MYSQL_USER, MYSQL_PASS)
        or die('Could not connect: '.mysql_error());
    mysql_select_db(MYSQL_DB);   
    
    // Check existence and value of exported
    $query = "SELECT exported FROM conf WHERE module='$module' AND ".
             "name='$name'";
    $result = mysql_query($query)
        or die('Query failed: '.mysql_error());
    if (mysql_num_rows($result) != 1) return FALSE;
    
    $row = mysql_fetch_row($result);
        
    $query = "DELETE FROM conf WHERE module='$module' AND name='$name'";    
    $result = mysql_query($query)    
        or die('Query failed: '.mysql_error());   

    if ($row[0] == 1)
        regenConf();
}

// ---------------------------------------------------------- regenConf()
function regenConf() {
    mysql_connect(MYSQL_SERVER, MYSQL_USER, MYSQL_PASS)
        or die('Could not connect: '.mysql_error());
    mysql_select_db(MYSQL_DB);   
    
    $query = "SELECT * FROM conf WHERE exported=1 ORDER BY module, name";    
    $result = mysql_query($query)
        or die('Query failed: '.mysql_error()); 
        
    $f = fopen('conf.php', 'w') 
        or die('Can not open conf.php for writing!');           
        
    fwrite($f, "<?php // This file is automatically generated. Do not edit.\n\n");
        
    while ($row = mysql_fetch_row($result)) {
        $mod = strtoupper($row[0]);
        $nam = strtoupper($row[1]);
        $val = $row[2];

        // write numerics directly
        if (is_numeric($val))
            fwrite($f, "define('$mod"."_$nam', $val);\n");
        else {
            // escape the single quotes
            $val = str_replace('\'','\\\'',$val);
            // end-of-php will break the conf.php; replace it:
            $val = str_replace('?'.'>', "?'.'>", $val);
            
            fwrite($f,"define('$mod"."_$nam', '$val');\n");
        }

    }     
    
    fwrite($f, '?'.'>');       
    fclose($f);    
}

?>