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<?php

namespace Drupal\Tests\system\Functional\Session;

use Drupal\Core\Url;
use Drupal\Tests\basic_auth\Traits\BasicAuthTestTrait;
use Drupal\Tests\BrowserTestBase;

/**
 * Tests if sessions are correctly handled when a user authenticates.
 *
 * @group Session
 */
class SessionAuthenticationTest extends BrowserTestBase {

  use BasicAuthTestTrait;

  /**
   * A test user.
   *
   * @var \Drupal\user\Entity\User
   */
  protected $user;

  /**
   * {@inheritdoc}
   */
  public static $modules = ['basic_auth', 'session_test'];

  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';

  /**
   * {@inheritdoc}
   */
  protected function setUp() {
    parent::setUp();

    // Create a test administrator user.
    $this->user = $this->drupalCreateUser(['administer site configuration']);
  }

  /**
   * Check that a basic authentication session does not leak.
   *
   * Regression test for a bug that caused a session initiated by basic
   * authentication to persist over subsequent unauthorized requests.
   */
  public function testSessionFromBasicAuthenticationDoesNotLeak() {
    // This route is authorized through basic_auth only, not cookie.
    $protected_url = Url::fromRoute('session_test.get_session_basic_auth');

    // This route is not protected.
    $unprotected_url = Url::fromRoute('session_test.get_session_no_auth');

    // Test that the route is not accessible as an anonymous user.
    $this->drupalGet($protected_url);
    $session = $this->getSession();
    $this->assertSession()->statusCodeEquals(401);

    // We should be able to access the route with basic authentication.
    $this->basicAuthGet($protected_url, $this->user->getAccountName(), $this->user->passRaw);
    $this->assertSession()->statusCodeEquals(200);

    // Check that the correct user is logged in.
    $this->assertEqual($this->user->id(), json_decode($session->getPage()->getContent())->user, 'The correct user is authenticated on a route with basic authentication.');
    $session->restart();

    // If we now try to access a page without basic authentication then we
    // should no longer be logged in.
    $this->drupalGet($unprotected_url);
    $this->assertSession()->statusCodeEquals(200);
    $this->assertEquals(0, json_decode($session->getPage()->getContent())->user, 'The user is no longer authenticated after visiting a page without basic authentication.');

    // If we access the protected page again without basic authentication we
    // should get 401 Unauthorized.
    $this->drupalGet($protected_url);
    $this->assertSession()->statusCodeEquals(401);
  }

  /**
   * Tests if a session can be initiated through basic authentication.
   */
  public function testBasicAuthSession() {
    // Set a session value on a request through basic auth.
    $test_value = 'alpaca';
    $response = $this->basicAuthGet('session-test/set-session/' . $test_value, $this->user->getAccountName(), $this->user->pass_raw);
    $this->assertSessionData($response, $test_value);
    $this->assertSession()->statusCodeEquals(200);

    // Test that on a subsequent request the session value is still present.
    $response = $this->basicAuthGet('session-test/get-session', $this->user->getAccountName(), $this->user->pass_raw);
    $this->assertSessionData($response, $test_value);
    $this->assertSession()->statusCodeEquals(200);
  }

  /**
   * Checks the session data returned by the session test routes.
   *
   * @param string $response
   *   A response object containing the session values and the user ID.
   * @param string $expected
   *   The expected session value.
   */
  protected function assertSessionData($response, $expected) {
    $response = json_decode($response, TRUE);
    $this->assertEqual(['test_value' => $expected], $response['session'], 'The session data matches the expected value.');

    // Check that we are logged in as the correct user.
    $this->assertEqual($this->user->id(), $response['user'], 'The correct user is logged in.');
  }

  /**
   * Tests that a session is not started automatically by basic authentication.
   */
  public function testBasicAuthNoSession() {
    // A route that is authorized through basic_auth only, not cookie.
    $no_cookie_url = Url::fromRoute('session_test.get_session_basic_auth');

    // A route that is authorized with standard cookie authentication.
    $cookie_url = 'user/login';

    // If we authenticate with a third party authentication system then no
    // session cookie should be set, the third party system is responsible for
    // sustaining the session.
    $this->basicAuthGet($no_cookie_url, $this->user->getAccountName(), $this->user->passRaw);
    $this->assertSession()->statusCodeEquals(200);
    $this->assertEmpty($this->getSessionCookies());
    // Mink stores some information in the session that breaks the next check if
    // not reset.
    $this->getSession()->restart();

    // On the other hand, authenticating using Cookie sets a cookie.
    $this->drupalGet($cookie_url);
    $this->assertEmpty($this->getSessionCookies());
    $edit = ['name' => $this->user->getAccountName(), 'pass' => $this->user->passRaw];
    $this->drupalPostForm($cookie_url, $edit, t('Log in'));
    $this->assertNotEmpty($this->getSessionCookies());
  }

}