<?php

/**
 * @file
 * Logs user authentication (login and logout) in the event_log module.
 *
 * @author Bas van Meurs
 * @copyright Cipix Internet
 */

/**
 * Implements hook_event_log_handlers().
 * @return array
 */
function event_log_auth_event_log_handlers() {
  // Authentication event log handler.
  $handlers = array();
  $handlers['authentication'] = array(
    'title' => t('User authentication'),
    'form_ids' => array('user_login', 'user_login_block', 'user_pass'),
    'form_submit_callback' => 'event_log_auth_form_submit',
    'relationships' => array(
      array(
        'table' => 'users',
        'field' => 'uid',
        'operations' => array('request password'),
        'numeric' => TRUE,
      ),
    ),
  );
  return $handlers;
}

/**
 * Event log callback for the user authentication event log.
 * @param $form
 * @param $form_state
 * @param $form_id
 * @return array
 */
function event_log_auth_form_submit($form, $form_state, $form_id) {
  global $user;
  $log = NULL;
  switch ($form_id) {
    case 'user_login':
    case 'user_login_block':
      $log = array(
        'operation' => 'login',
        'description' => $user->name,
      );
      break;
    case 'user_pass':
      $log = array(
        'operation' => 'request password',
        'description' => isset($user->name) ? $user->name : 'Anonymous',
        'ref_numeric' => $user->uid,
      );
      break;
  }
  return $log;
}

/**
 * Implements hook_user_logout().
 */
function event_log_auth_user_logout($account) {
  $log = array(
    'type' => 'authentication',
    'operation' => 'logout',
    'description' => $account->name,
    'uid' => $account->uid,
  );
  event_log_insert($log);
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function event_log_auth_form_user_login_alter(&$form, &$form_state) {
  $form['#validate'][] = 'event_log_auth_user_login_validate';
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function event_log_auth_form_user_login_block_alter(&$form, &$form_state) {
  $form['#validate'][] = 'event_log_auth_user_login_validate';
}

function event_log_auth_user_login_validate($form, &$form_state) {
  // Check for erros and log them.
  $errors = form_get_errors();
  if (!empty($errors)) {
    $log = array(
      'type' => 'authentication',
      'operation' => 'fail',
      'description' => t("Validation errors: @errors", array('@errors' => implode(", ", $errors))),
    );
    if (!empty($form_state['values']['name'])) {
      $log['ref_char'] = $form_state['values']['name'];
    }
    event_log_insert($log);
  }
}