class UserLoginTest

class UserLoginTest extends BrowserTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Tests login with destination.
     */
    public function testLoginCacheTagsAndDestination() {
        $this->drupalGet('user/login');
        // The user login form says "Enter your <site name> username.", hence it
        // depends on config:system.site, and its cache tags should be present.
        $this->assertCacheTag('config:system.site');
        $user = $this->drupalCreateUser([]);
        $this->drupalGet('user/login', [
            'query' => [
                'destination' => 'foo',
            ],
        ]);
        $edit = [
            'name' => $user->getAccountName(),
            'pass' => $user->passRaw,
        ];
        $this->drupalPostForm(NULL, $edit, t('Log in'));
        $this->assertUrl('foo', [], 'Redirected to the correct URL');
    }
    
    /**
     * Test the global login flood control.
     */
    public function testGlobalLoginFloodControl() {
        $this->config('user.flood')
            ->set('ip_limit', 10)
            ->set('user_limit', 4000)
            ->save();
        $user1 = $this->drupalCreateUser([]);
        $incorrect_user1 = clone $user1;
        $incorrect_user1->passRaw .= 'incorrect';
        // Try 2 failed logins.
        for ($i = 0; $i < 2; $i++) {
            $this->assertFailedLogin($incorrect_user1);
        }
        // A successful login will not reset the IP-based flood control count.
        $this->drupalLogin($user1);
        $this->drupalLogout();
        // Try 8 more failed logins, they should not trigger the flood control
        // mechanism.
        for ($i = 0; $i < 8; $i++) {
            $this->assertFailedLogin($incorrect_user1);
        }
        // The next login trial should result in an IP-based flood error message.
        $this->assertFailedLogin($incorrect_user1, 'ip');
        // A login with the correct password should also result in a flood error
        // message.
        $this->assertFailedLogin($user1, 'ip');
    }
    
    /**
     * Test the per-user login flood control.
     */
    public function testPerUserLoginFloodControl() {
        $this->config('user.flood')
            ->set('ip_limit', 4000)
            ->set('user_limit', 3)
            ->save();
        $user1 = $this->drupalCreateUser([]);
        $incorrect_user1 = clone $user1;
        $incorrect_user1->passRaw .= 'incorrect';
        $user2 = $this->drupalCreateUser([]);
        // Try 2 failed logins.
        for ($i = 0; $i < 2; $i++) {
            $this->assertFailedLogin($incorrect_user1);
        }
        // A successful login will reset the per-user flood control count.
        $this->drupalLogin($user1);
        $this->drupalLogout();
        // Try 3 failed logins for user 1, they will not trigger flood control.
        for ($i = 0; $i < 3; $i++) {
            $this->assertFailedLogin($incorrect_user1);
        }
        // Try one successful attempt for user 2, it should not trigger any
        // flood control.
        $this->drupalLogin($user2);
        $this->drupalLogout();
        // Try one more attempt for user 1, it should be rejected, even if the
        // correct password has been used.
        $this->assertFailedLogin($user1, 'user');
    }
    
    /**
     * Test that user password is re-hashed upon login after changing $count_log2.
     */
    public function testPasswordRehashOnLogin() {
        // Determine default log2 for phpass hashing algorithm
        $default_count_log2 = 16;
        // Retrieve instance of password hashing algorithm
        $password_hasher = $this->container
            ->get('password');
        // Create a new user and authenticate.
        $account = $this->drupalCreateUser([]);
        $password = $account->passRaw;
        $this->drupalLogin($account);
        $this->drupalLogout();
        // Load the stored user. The password hash should reflect $default_count_log2.
        $user_storage = $this->container
            ->get('entity_type.manager')
            ->getStorage('user');
        $account = User::load($account->id());
        $this->assertIdentical($password_hasher->getCountLog2($account->getPassword()), $default_count_log2);
        // Change the required number of iterations by loading a test-module
        // containing the necessary container builder code and then verify that the
        // users password gets rehashed during the login.
        $overridden_count_log2 = 19;
        \Drupal::service('module_installer')->install([
            'user_custom_phpass_params_test',
        ]);
        $this->resetAll();
        $account->passRaw = $password;
        $this->drupalLogin($account);
        // Load the stored user, which should have a different password hash now.
        $user_storage->resetCache([
            $account->id(),
        ]);
        $account = $user_storage->load($account->id());
        $this->assertIdentical($password_hasher->getCountLog2($account->getPassword()), $overridden_count_log2);
        $this->assertTrue($password_hasher->check($password, $account->getPassword()));
    }
    
    /**
     * Make an unsuccessful login attempt.
     *
     * @param \Drupal\user\Entity\User $account
     *   A user object with name and passRaw attributes for the login attempt.
     * @param mixed $flood_trigger
     *   (optional) Whether or not to expect that the flood control mechanism
     *    will be triggered. Defaults to NULL.
     *   - Set to 'user' to expect a 'too many failed logins error.
     *   - Set to any value to expect an error for too many failed logins per IP
     *   .
     *   - Set to NULL to expect a failed login.
     */
    public function assertFailedLogin($account, $flood_trigger = NULL) {
        $edit = [
            'name' => $account->getAccountName(),
            'pass' => $account->passRaw,
        ];
        $this->drupalPostForm('user/login', $edit, t('Log in'));
        $this->assertNoFieldByXPath("//input[@name='pass' and @value!='']", NULL, 'Password value attribute is blank.');
        if (isset($flood_trigger)) {
            if ($flood_trigger == 'user') {
                $this->assertRaw(\Drupal::translation()->formatPlural($this->config('user.flood')
                    ->get('user_limit'), 'There has been more than one failed login attempt for this account. It is temporarily blocked. Try again later or <a href=":url">request a new password</a>.', 'There have been more than @count failed login attempts for this account. It is temporarily blocked. Try again later or <a href=":url">request a new password</a>.', [
                    ':url' => Url::fromRoute('user.pass')->toString(),
                ]));
            }
            else {
                // No uid, so the limit is IP-based.
                $this->assertRaw(t('Too many failed login attempts from your IP address. This IP address is temporarily blocked. Try again later or <a href=":url">request a new password</a>.', [
                    ':url' => Url::fromRoute('user.pass')->toString(),
                ]));
            }
        }
        else {
            $this->assertText(t('Unrecognized username or password. Forgot your password?'));
        }
    }

}