<?php

/**
 * Implements hook_menu().
 */
function session_test_menu() {
  $items['session-test/get'] = array(
    'title' => 'Session value',
    'page callback' => '_session_test_get',
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
  );
  $items['session-test/id'] = array(
    'title' => 'Session ID',
    'page callback' => '_session_test_id',
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
  );
  $items['session-test/id-from-cookie'] = array(
    'title' => 'Session ID from cookie',
    'page callback' => '_session_test_id_from_cookie',
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
  );
  $items['session-test/set/%'] = array(
    'title' => 'Set session value',
    'page callback' => '_session_test_set',
    'page arguments' => array(2),
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
  );
  $items['session-test/no-set/%'] = array(
    'title' => 'Set session value but do not save session',
    'page callback' => '_session_test_no_set',
    'page arguments' => array(2),
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
  );
  $items['session-test/set-message'] = array(
    'title' => 'Set message',
    'page callback' => '_session_test_set_message',
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
  );
  $items['session-test/set-message-but-dont-save'] = array(
    'title' => 'Set message but do not save session',
    'page callback' => '_session_test_set_message_but_dont_save',
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
  );
  $items['session-test/set-not-started'] = array(
    'title' => 'Set message when session is not started',
    'page callback' => '_session_test_set_not_started',
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
  );
  $items['session-test/is-logged-in'] = array(
    'title' => 'Check if user is logged in',
    'page callback' => '_session_test_is_logged_in',
    'access callback' => 'user_is_logged_in',
    'type' => MENU_CALLBACK,
  );

  return $items;
}

/**
 * It's very unusual to do anything outside of a function / hook, but in this
 * case we want to simulate a given session.cookie_samesite setting in php.ini
 * or via ini_set() in settings.php. This would almost never be a good idea
 * outside of a test scenario.
 */
if (isset($_SERVER['HTTP_X_SESSION_COOKIE_INI_SET'])) {
  if (in_array($_SERVER['HTTP_X_SESSION_COOKIE_INI_SET'], array('None', 'Lax', 'Strict', '*EMPTY*'))) {
    $value = ($_SERVER['HTTP_X_SESSION_COOKIE_INI_SET'] == '*EMPTY*') ? '' : $_SERVER['HTTP_X_SESSION_COOKIE_INI_SET'];
    ini_set('session.cookie_samesite', $value);
  }
}

/**
 * Implements hook_boot().
 */
function session_test_boot() {
  header('X-Session-Empty: ' . intval(empty($_SESSION)));
}

/**
 * Page callback, prints the stored session value to the screen.
 */
function _session_test_get() {
  if (!empty($_SESSION['session_test_value'])) {
    return t('The current value of the stored session variable is: %val', array('%val' => $_SESSION['session_test_value']));
  }
  else {
    return "";
  }
}

/**
 * Page callback, stores a value in $_SESSION['session_test_value'].
 */
function _session_test_set($value) {
  $_SESSION['session_test_value'] = $value;
  return t('The current value of the stored session variable has been set to %val', array('%val' => $value));
}

/**
 * Menu callback: turns off session saving and then tries to save a value
 * anyway.
 */
function _session_test_no_set($value) {
  drupal_save_session(FALSE);
  _session_test_set($value);
  return t('session saving was disabled, and then %val was set', array('%val' => $value));
}

/**
 * Menu callback: print the current session ID.
 */
function _session_test_id() {
  // Set a value in $_SESSION, so that drupal_session_commit() will start
  // a session.
  $_SESSION['test'] = 'test';

  drupal_session_commit();

  return 'session_id:' . session_id() . "\n";
}

/**
 * Menu callback: print the current session ID as read from the cookie.
 */
function _session_test_id_from_cookie() {
  return 'session_id:' . $_COOKIE[session_name()] . "\n";
}

/**
 * Menu callback, sets a message to me displayed on the following page.
 */
function _session_test_set_message() {
  drupal_set_message(t('This is a dummy message.'));
  print t('A message was set.');
  // Do not return anything, so the current request does not result in a themed
  // page with messages. The message will be displayed in the following request
  // instead.
}

/**
 * Menu callback, sets a message but call drupal_save_session(FALSE).
 */
function _session_test_set_message_but_dont_save() {
  drupal_save_session(FALSE);
  _session_test_set_message();
}

/**
 * Menu callback, stores a value in $_SESSION['session_test_value'] without
 * having started the session in advance.
 */
function _session_test_set_not_started() {
  if (!drupal_session_will_start()) {
    $_SESSION['session_test_value'] = t('Session was not started');
  }
}

/**
 * Implements hook_user().
 */
function session_test_user_login($edit = array(), $user = NULL) {
  if ($user->name == 'session_test_user') {
    // Exit so we can verify that the session was regenerated
    // before hook_user() was called.
    exit;
  }
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function session_test_form_user_login_alter(&$form) {
  $form['#https'] = TRUE;
}

/**
 * Implements hook_drupal_goto_alter().
 *
 * Force the redirection to go to a non-secure page after being on a secure
 * page through https.php.
 */
function session_test_drupal_goto_alter(&$path, &$options, &$http_response_code) {
  global $base_insecure_url, $is_https_mock;
  // Alter the redirect to use HTTP when using a mock HTTPS request through
  // https.php because form submissions would otherwise redirect to a
  // non-existent HTTPS site.
  if (!empty($is_https_mock)) {
    $path = $base_insecure_url . '/' . $path;
  }
}

/**
 * Menu callback, only available if current user is logged in.
 */
function _session_test_is_logged_in() {
  return t('User is logged in.');
}
