<?php

/* Authentifycation library */

/* Add a user */
function add_user($login, $table, $type, $pass, $pass2) {
  global $gecos;
  global $salt;

  if ((strlen($login) == 0) || (strlen($pass) == 0))
    return 0;

  if (($type != 1) && ($type != 2))
    return 0;

  if ($pass != $pass2)
    return -1;

  if (count($gecos))
    foreach ($gecos as $user)
      if (($user["login"] == $login) && ($user["table"] == $table))
        return -2;

  /* Found last id */
  $id = "";
  if (count($gecos))
    foreach ($gecos as $user)
      if ($user["id"] > $id)
        $id = $user["id"];
  /* Now add the user */
  $gecos[] = array("id" => ++$id, "login" => $login, "table" => $table,
		   "type" => $type, "password" => crypt($pass, $salt));

  /* Now the array $gecos contains the existing users and
   (encrypted) passwords from the file and the new user (and the
   encrypted password). */
  return store_password($id);
}
 
/* Modify a user password */
function modify_user_password($id, $pass, $pass2) {
  global $gecos;
  global $salt;

  if (strlen($pass) == 0)
    return 0;

  if ($pass != $pass2)
    return -1;

  if (count($gecos))
    foreach ($gecos as $key => $user)
      if ($user["id"] == $id) {
        $gecos[$key]["password"] = crypt($pass, $salt);
        return store_password($id);
      }

  return -2;
}

/* Modify a user jsflag */
function modify_user_jsflag($id, $jsflag) {
  global $gecos;

  if (count($gecos))
    foreach ($gecos as $key => $user)
      if ($user["id"] == $id) {
        $gecos[$key]["jsflag"] = $jsflag;
        return store_password($id);
      }

  return 0;
}

/* Delete a user */
function delete_user($id) {
  global $gecos;

  if (count($gecos))
    foreach ($gecos as $key => $user)
      if ($user["id"] == $id) {
        unset($gecos[$key]);
        return store_password($id);
      }

  return 0;
}

/* Check if a table already exists */
function is_table($table) {
  global $gecos;

  if (count($gecos))
    foreach ($gecos as $user)
      if ($user["table"] == $table)
        return 1;

  return 0;
}

/* Check if an user/password is valid the password file  */
function check_user($login, $table, $pass) {
  global $gecos;

  if (($login == "") || ($table == ""))
    return -1;

  if (count($gecos))
    foreach ($gecos as $user)
      if (($user["login"] == $login) && ($user["table"] == $table)) {
        if (crypt($pass, $user["password"]) == $user["password"])
	  return $user["id"];
        else
          return 0;
      }

  return -1;
}

/* Get user */
function get_user($id) {
  global $gecos;

  if (count($gecos))
    foreach ($gecos as $user)
      if ($user["id"] == $id)
        return $user;

  return NULL;
}

/* Get user for a table*/
function get_table($table) {
  global $gecos;

  $u = array();
  if (count($gecos))
    foreach ($gecos as $user)
      if ($user["table"] == $table)
        $u[] = $user;

  return $u;
}

/* Get type */
function get_type($id) {
  global $gecos;

  if ($id <= 0)
    return $id;

  if (count($gecos))
    foreach ($gecos as $key => $user)
      if ($user["id"] == $id)
        return $user["type"];

  return 0;
}

/* Initialization */

include($lib_dir.$db_type."/authentification.php");
  
/* Generate a random salt with letters and/or numbers */
mt_srand((double)microtime()*1000000);
$chars = array_merge(range('a','z'),range('A','Z'),range(0,9));
for($i=0;$i<2;$i++)
  $salt .= $chars[mt_rand(0,count($chars)-1)]; 
/* Salt $salt created */

?>