joomla_login.module

<?php

/**
 * Display help and module information
 * @param path which path of the site we're displaying help
 * @param arg array that holds the current path as would be returned from arg() function
 * @return help text for the path
 */
function joomla_login_help($path, $arg) {
  $output = "";
  switch ($path) {
  case "admin/help/jooml_module":
    $output = '<p>' . t("Overrides default Drupal login system.") . '</p>';
    break;
  }
  return $output;
}


/**
 * Valid permissions for this module
 * @return array An array of valid permissions for the joomla_login module
 */
function joomla_login_perm() {
  return array('administer joomla_login');
}


/**
 * Implementation of hook_module_init().
 */
function joomla_login_init() {
  module_load_include('inc', 'joomla_login', 'crypt');
}


/**
 * Implementation of hook_menu().
 */
function joomla_login_menu() {
  $items = array();

  $items['joomla_login/test'] = array(
    'page callback' => 'joomla_login_test',
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
  );

  return $items;
}


/**
 * Test to check that module installation works
 */
function joomla_login_test() {
  return "content";
}


/**
 * Implementation of hool_user().
 * This method listens on 'insert' and 'after_update' operation and creates salted password
 * based on joomla password standerd and updates the user row with the salted password
 */
function joomla_login_user($op, &$edit, &$account, $category = NULL){
  if( ($op == "insert" || $op == "after_update") && $account->uid != 1){
    $pass = $edit['pass'];
    create_password($pass, $account->uid);
  }
}

/**
 * Implementation of hook_form_alter().
 * This method finds user login forms and sets  joomla_login_authenticate_validate method as validatior callback
 */
function joomla_login_form_alter(&$form, &$form_state, $form_id){
  if($form_id == 'user_login' || $form_id == 'user_login_block'){
    $form['#validate'] = array('user_login_name_validate', 'joomla_login_authenticate_validate', 'user_login_final_validate');
  }
}


function joomla_login_authenticate_validate($form, &$form_state) {
  joomla_login_user_authenticate($form_state['values']);
}


/**
 * This method is modified version of user_authenticate() method. It loads user by name at first
 * then matches with the salted password.
 * @see user_authenticate()
 */
function joomla_login_user_authenticate($form_values = array()) {
  global $user;

  //load user by name and check that user is denied
  $account = user_load(array('name' => $form_values['name'], 'status' => 1));
  if ($account && drupal_is_denied('mail', $account->mail)) {
    form_set_error('name', t('The name %name is registered using a reserved e-mail address and therefore could not be logged in.', array('%name' => $account->name)));
  }

  //match password and check for errors
  $password_match = check_password($account->pass, $form_values['pass']);

  if (!form_get_errors() && !empty($form_values['name']) && $password_match && $account) {
    $user = $account;
    user_authenticate_finalize($form_values);
    return $user;
  }
  else {
    watchdog('user', 'Login attempt failed for %user.', array('%user' => $form_values['name']));
  }
}