<?php

/**
 * Perform end-to-end tests of the upgrade path.
 */
abstract class UpgradePathTestCase extends DrupalWebTestCase {

  /**
   * The file path(s) to the dumped database(s) to load into the child site.
   *
   * @var array
   */
  var $databaseDumpFiles = array();

  /**
   * Flag that indicates whether the child site has been upgraded.
   */
  var $upgradedSite = FALSE;

  /**
   * Array of errors triggered during the upgrade process.
   */
  var $upgradeErrors = array();

  /**
   * Array of modules loaded when the test starts.
   */
  var $loadedModules = array();

  /**
   * Override of DrupalWebTestCase::setUp() specialized for upgrade testing.
   */
  protected function setUp() {
    global $user, $language, $conf;

    // Load the Update API.
    require_once DRUPAL_ROOT . '/includes/update.inc';

    // Reset flags.
    $this->upgradedSite = FALSE;
    $this->upgradeErrors = array();

    $this->loadedModules = module_list();

    // Generate a temporary prefixed database to ensure that tests have a clean starting point.
    $this->databasePrefix = 'simpletest' . mt_rand(1000, 1000000);
    db_update('simpletest_test_id')
      ->fields(array('last_prefix' => $this->databasePrefix))
      ->condition('test_id', $this->testId)
      ->execute();

    // Clone the current connection and replace the current prefix.
    $connection_info = Database::getConnectionInfo('default');
    Database::renameConnection('default', 'simpletest_original_default');
    foreach ($connection_info as $target => $value) {
      $connection_info[$target]['prefix'] = array(
        'default' => $value['prefix']['default'] . $this->databasePrefix,
      );
    }
    Database::addConnectionInfo('default', 'default', $connection_info['default']);

    // Store necessary current values before switching to prefixed database.
    $this->originalLanguage = $language;
    $this->originalLanguageDefault = variable_get('language_default');
    $this->originalFileDirectory = variable_get('file_public_path', conf_path() . '/files');
    $this->originalProfile = drupal_get_profile();
    $clean_url_original = variable_get('clean_url', 0);

    // Unregister the registry.
    // This is required to make sure that the database layer works properly.
    spl_autoload_unregister('drupal_autoload_class');
    spl_autoload_unregister('drupal_autoload_interface');

    // Create test directories ahead of installation so fatal errors and debug
    // information can be logged during installation process.
    // Use mock files directories with the same prefix as the database.
    $public_files_directory  = $this->originalFileDirectory . '/simpletest/' . substr($this->databasePrefix, 10);
    $private_files_directory = $public_files_directory . '/private';
    $temp_files_directory    = $private_files_directory . '/temp';

    // Create the directories.
    file_prepare_directory($public_files_directory, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS);
    file_prepare_directory($private_files_directory, FILE_CREATE_DIRECTORY);
    file_prepare_directory($temp_files_directory, FILE_CREATE_DIRECTORY);
    $this->generatedTestFiles = FALSE;

    // Log fatal errors.
    ini_set('log_errors', 1);
    ini_set('error_log', $public_files_directory . '/error.log');

    // Reset all statics and variables to perform tests in a clean environment.
    $conf = array();

    // Load the database from the portable PHP dump.
    foreach ($this->databaseDumpFiles as $file) {
      require $file;
    }

    // Set path variables.
    $this->variable_set('file_public_path', $public_files_directory);
    $this->variable_set('file_private_path', $private_files_directory);
    $this->variable_set('file_temporary_path', $temp_files_directory);

    $this->pass('Finished loading the dump.');

    // Load user 1.
    $this->originalUser = $user;
    drupal_save_session(FALSE);
    $user = db_query('SELECT * FROM {users} WHERE uid = :uid', array(':uid' => 1))->fetchObject();

    // Generate and set a D6-compatible session cookie.
    $this->curlInitialize();
    $sid = drupal_hash_base64(uniqid(mt_rand(), TRUE) . drupal_random_bytes(55));
    $session_name = update_get_d6_session_name();
    curl_setopt($this->curlHandle, CURLOPT_COOKIE, rawurlencode($session_name) . '=' . rawurlencode($sid));

    // Force our way into the session of the child site.
    drupal_save_session(TRUE);
    // A session cannot be written without the ssid column which is missing on
    // Drupal 6 sites.
    db_add_field('sessions', 'ssid', array('description' => "Secure session ID. The value is generated by Drupal's session handlers.", 'type' => 'varchar', 'length' => 128, 'not null' => TRUE, 'default' => ''));
    _drupal_session_write($sid, '');
    // Remove the temporarily added ssid column.
    db_drop_field('sessions', 'ssid');
    drupal_save_session(FALSE);

    // Restore necessary variables.
    $this->variable_set('clean_url', $clean_url_original);
    $this->variable_set('site_mail', 'simpletest@example.com');

    drupal_set_time_limit($this->timeLimit);
  }

  /**
   * Override of DrupalWebTestCase::tearDown() specialized for upgrade testing.
   */
  protected function tearDown() {
    global $user, $language;

    // In case a fatal error occurred that was not in the test process read the
    // log to pick up any fatal errors.
    simpletest_log_read($this->testId, $this->databasePrefix, get_class($this), TRUE);

    // Delete temporary files directory.
    file_unmanaged_delete_recursive($this->originalFileDirectory . '/simpletest/' . substr($this->databasePrefix, 10));

    // Get back to the original connection.
    Database::removeConnection('default');
    Database::renameConnection('simpletest_original_default', 'default');

    // Remove all prefixed tables.
    $tables = db_find_tables($this->databasePrefix . '%');
    foreach ($tables as $table) {
      db_drop_table($table);
    }

    // Return the user to the original one.
    $user = $this->originalUser;
    drupal_save_session(TRUE);

    // Ensure that internal logged in variable and cURL options are reset.
    $this->loggedInUser = FALSE;
    $this->additionalCurlOptions = array();

    // Reload module list and implementations to ensure that test module hooks
    // aren't called after tests.
    module_list(TRUE);
    module_implements('', FALSE, TRUE);

    // Reset the Field API.
    field_cache_clear();

    // Rebuild caches.
    parent::refreshVariables();

    // Reset language.
    $language = $this->originalLanguage;
    if ($this->originalLanguageDefault) {
      $GLOBALS['conf']['language_default'] = $this->originalLanguageDefault;
    }

    // Close the CURL handler.
    $this->curlClose();
  }

  /**
   * Specialized variable_set() that works even if the child site is not upgraded.
   *
   * @param $name
   *   The name of the variable to set.
   * @param $value
   *   The value to set. This can be any PHP data type; these functions take care
   *   of serialization as necessary.
   */
  protected function variable_set($name, $value) {
    db_delete('variable')
      ->condition('name', $name)
      ->execute();
    db_insert('variable')
      ->fields(array(
        'name' => $name,
        'value' => serialize($value),
      ))
      ->execute();

    try {
      cache_clear_all('variables', 'cache');
      cache_clear_all('variables', 'cache_bootstrap');
    }
    // Since cache_bootstrap won't exist in a Drupal 6 site, ignore the
    // exception if the above fails.
    catch (Exception $e) {}
  }

  /**
   * Specialized refreshVariables().
   */
  protected function refreshVariables() {
    // No operation if the child has not been upgraded yet.
    if (!$this->upgradedSite) {
      return parent::refreshVariables();
    }
  }

  /**
   * Perform the upgrade.
   *
   * @param $register_errors
   *   Register the errors during the upgrade process as failures.
   * @return
   *   TRUE if the upgrade succeeded, FALSE otherwise.
   */
  protected function performUpgrade($register_errors = TRUE) {
    $update_url = $GLOBALS['base_url'] . '/update.php';

    // Load the first update screen.
    $this->drupalGet($update_url, array('external' => TRUE));
    if (!$this->assertResponse(200)) {
      return FALSE;
    }

    // Continue.
    $this->drupalPost(NULL, array(), t('Continue'));
    if (!$this->assertResponse(200)) {
      return FALSE;
    }

    // Go!
    $this->drupalPost(NULL, array(), t('Apply pending updates'));
    if (!$this->assertResponse(200)) {
      return FALSE;
    }

    // Check for errors during the update process.
    foreach ($this->xpath('//li[@class=:class]', array(':class' => 'failure')) as $element) {
      $message = strip_tags($element->asXML());
      $this->upgradeErrors[] = $message;
      if ($register_errors) {
        $this->fail($message);
      }
    }

    if (!empty($this->upgradeErrors)) {
      // Upgrade failed, the installation might be in an inconsistent state,
      // don't process.
      return FALSE;
    }

    // Check if there still are pending updates.
    $this->drupalGet($update_url, array('external' => TRUE));
    $this->drupalPost(NULL, array(), t('Continue'));
    if (!$this->assertText(t('No pending updates.'), t('No pending updates at the end of the update process.'))) {
      return FALSE;
    }

    // Upgrade succeed, rebuild the environment so that we can call the API
    // of the child site directly from this request.
    $this->upgradedSite = TRUE;

    // Reload module list. For modules that are enabled in the test database,
    // but not on the test client, we need to load the code here.
    $new_modules = array_diff(module_list(TRUE), $this->loadedModules);
    foreach ($new_modules as $module) {
      drupal_load('module', $module);
    }

    // Reload hook implementations
    module_implements('', FALSE, TRUE);

    // Rebuild caches.
    drupal_static_reset();
    drupal_flush_all_caches();

    // Reload global $conf array and permissions.
    $this->refreshVariables();
    $this->checkPermissions(array(), TRUE);

    return TRUE;
  }

  /**
   * Force uninstall all modules from a test database, except those listed.
   *
   * @param $modules
   *   The list of modules to keep installed. Required core modules will
   *   always be kept.
   */
  protected function uninstallModulesExcept(array $modules) {
    $required_modules = array('block', 'dblog', 'filter', 'node', 'system', 'update', 'user');

    $modules = array_merge($required_modules, $modules);

    db_delete('system')
      ->condition('type', 'module')
      ->condition('name', $modules, 'NOT IN')
      ->execute();
  }

}

/**
 * Perform basic upgrade tests.
 *
 * Load a bare installation of Drupal 6 and run the upgrade process on it.
 *
 * The install only contains dblog (although it's optional, it's only so that
 * another hook_watchdog module can take its place, the site is not functional
 * without watchdog) and update.
 */
class BasicUpgradePath extends UpgradePathTestCase {
  public static function getInfo() {
    return array(
      'name'  => 'Basic upgrade path',
      'description'  => 'Basic upgrade path tests.',
      'group' => 'Upgrade path',
    );
  }

  public function setUp() {
    // Path to the database dump files.
    $this->databaseDumpFiles = array(
      drupal_get_path('module', 'simpletest') . '/tests/upgrade/drupal-6.bare.database.php',
    );
    parent::setUp();
  }

  /**
   * Test a failed upgrade, and verify that the failure is reported.
   */
  public function testFailedUpgrade() {
    // Destroy a table that the upgrade process needs.
    db_drop_table('access');
    // Assert that the upgrade fails.
    $this->assertFalse($this->performUpgrade(FALSE), t('A failed upgrade should return messages.'));
  }

  /**
   * Test a successful upgrade.
   */
  public function testBasicUpgrade() {
    $this->assertTrue($this->performUpgrade(), t('The upgrade was completed successfully.'));

    // Hit the frontpage.
    $this->drupalGet('');
    $this->assertResponse(200);

    // Verify that we are still logged in.
    $this->drupalGet('user');
    $this->clickLink(t('Edit'));
    $this->assertEqual($this->getUrl(), url('user/1/edit', array('absolute' => TRUE)), t('We are still logged in as admin at the end of the upgrade.'));

    // Logout and verify that we can login back in with our initial password.
    $this->drupalLogout();
    $this->drupalLogin((object) array(
      'uid' => 1,
      'name' => 'admin',
      'pass_raw' => 'admin',
    ));

    // The previous login should've triggered a password rehash, so login one
    // more time to make sure the new hash is readable.
    $this->drupalLogout();
    $this->drupalLogin((object) array(
      'uid' => 1,
      'name' => 'admin',
      'pass_raw' => 'admin',
    ));

    // Test that the site name is correctly displayed.
    $this->assertText('Drupal 6', t('The site name is correctly displayed.'));

    // Verify that the main admin sections are available.
    $this->drupalGet('admin');
    $this->assertText(t('Content'));
    $this->assertText(t('Appearance'));
    $this->assertText(t('People'));
    $this->assertText(t('Configuration'));
    $this->assertText(t('Reports'));
    $this->assertText(t('Structure'));
    $this->assertText(t('Modules'));

    // Confirm that no {menu_links} entry exists for user/autocomplete.
    $result = db_query('SELECT COUNT(*) FROM {menu_links} WHERE link_path = :user_autocomplete', array(':user_autocomplete' => 'user/autocomplete'))->fetchField();
    $this->assertFalse($result, t('No {menu_links} entry exists for user/autocomplete'));

    // Test that the environment after the upgrade is in a consistent status.
    $update_d6 = variable_get('update_d6', FALSE);
    $this->assertFalse($update_d6, t('The D6 upgrade flag variable has been correctly disabled.'));
  }
}
