class UserLoginTest

class UserLoginTest extends BrowserTestBase {
    use AssertMailTrait {
        getMails as drupalGetMails;
    }
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'dblog',
    ];
    
    /**
     * Tests login with destination.
     */
    public function testLoginCacheTagsAndDestination() : void {
        $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->assertSession()
            ->responseHeaderContains('X-Drupal-Cache-Tags', 'config:system.site');
        $user = $this->drupalCreateUser([]);
        $this->drupalGet('user/login', [
            'query' => [
                'destination' => 'foo',
            ],
        ]);
        $edit = [
            'name' => $user->getAccountName(),
            'pass' => $user->passRaw,
        ];
        $this->submitForm($edit, 'Log in');
        $this->assertSession()
            ->addressEquals('foo');
    }
    
    /**
     * Tests the global login flood control.
     */
    public function testGlobalLoginFloodControl() : void {
        $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');
        // A login attempt after resetting the password should still fail, since the
        // IP-based flood control count is not cleared after a password reset.
        $this->resetUserPassword($user1);
        $this->drupalLogout();
        $this->assertFailedLogin($user1, 'ip');
        $this->assertSession()
            ->responseContains('Too many failed login attempts from your IP address.');
    }
    
    /**
     * Tests the per-user login flood control.
     */
    public function testPerUserLoginFloodControl() : void {
        $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);
        }
        // We're not going to test resetting the password which should clear the
        // flood table and allow the user to log in again.
        $this->drupalLogin($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');
        $this->resetUserPassword($user1);
        $this->drupalLogout();
        // Try to log in as user 1, it should be successful.
        $this->drupalLogin($user1);
        $this->assertSession()
            ->responseContains('Member for');
    }
    
    /**
     * Tests user password is re-hashed upon login after changing $count_log2.
     */
    public function testPasswordRehashOnLogin() : void {
        // 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 shouldn't need a rehash.
        $user_storage = $this->container
            ->get('entity_type.manager')
            ->getStorage('user');
        $account = User::load($account->id());
        // Check that the stored password doesn't need rehash.
        $this->assertFalse($password_hasher->needsRehash($account->getPassword()));
        // The current hashing cost is set to 10 in the container. Increase cost by
        // one, by enabling a module containing the necessary container changes.
        \Drupal::service('module_installer')->install([
            'user_custom_pass_hash_params_test',
        ]);
        $this->resetAll();
        // Reload the hashing service after container changes.
        $password_hasher = $this->container
            ->get('password');
        // Check that the stored password does need rehash.
        $this->assertTrue($password_hasher->needsRehash($account->getPassword()));
        $account->passRaw = $password;
        $this->drupalGet('user/login');
        $edit = [
            'name' => $account->getAccountName(),
            'pass' => $account->passRaw,
        ];
        $this->submitForm($edit, 'Log in');
        // Load the stored user, which should have a different password hash now.
        $user_storage->resetCache([
            $account->id(),
        ]);
        $account = $user_storage->load($account->id());
        // Check that the stored password doesn't need rehash.
        $this->assertFalse($password_hasher->needsRehash($account->getPassword()));
        $this->assertTrue($password_hasher->check($password, $account->getPassword()));
    }
    
    /**
     * Tests log in with a maximum length and a too long password.
     */
    public function testPasswordLengthLogin() : void {
        // Create a new user and authenticate.
        $account = $this->drupalCreateUser([]);
        $current_password = $account->passRaw;
        $this->drupalLogin($account);
        // Use the length specified in
        // \Drupal\Core\Render\Element\Password::getInfo().
        $length = 128;
        $current_password = $this->doPasswordLengthLogin($account, $current_password, $length);
        $this->assertSession()
            ->pageTextNotContains('Password cannot be longer than');
        $this->assertSession()
            ->pageTextContains('Member for');
        $this->doPasswordLengthLogin($account, $current_password, $length + 1);
        $this->assertSession()
            ->pageTextContains('Password cannot be longer than ' . $length . ' characters but is currently ' . ($length + 1) . ' characters long.');
        $this->assertSession()
            ->pageTextNotContains('Member for');
    }
    
    /**
     * Helper to test log in with a maximum length password.
     *
     * @param \Drupal\user\UserInterface $account
     *   An object containing the user account.
     * @param string $current_password
     *   The current password associated with the user.
     * @param int $length
     *   The length of the password.
     *
     * @return string
     *   The new password associated with the user.
     */
    public function doPasswordLengthLogin(UserInterface $account, string $current_password, int $length) {
        $new_password = \Drupal::service('password_generator')->generate($length);
        $uid = $account->id();
        $edit = [
            'current_pass' => $current_password,
            'mail' => $account->getEmail(),
            'pass[pass1]' => $new_password,
            'pass[pass2]' => $new_password,
        ];
        // Change the password.
        $this->drupalGet("user/{$uid}/edit");
        $this->submitForm($edit, 'Save');
        $this->assertSession()
            ->pageTextContains('The changes have been saved.');
        $this->drupalLogout();
        // Login with new password.
        $this->drupalGet('user/login');
        $edit = [
            'name' => $account->getAccountName(),
            'pass' => $new_password,
        ];
        $this->submitForm($edit, 'Log in');
        return $new_password;
    }
    
    /**
     * Tests with a browser that denies cookies.
     */
    public function testCookiesNotAccepted() : void {
        $this->drupalGet('user/login');
        $form_build_id = $this->getSession()
            ->getPage()
            ->findField('form_build_id');
        $account = $this->drupalCreateUser([]);
        $post = [
            'form_id' => 'user_login_form',
            'form_build_id' => $form_build_id,
            'name' => $account->getAccountName(),
            'pass' => $account->passRaw,
            'op' => 'Log in',
        ];
        $url = $this->buildUrl(Url::fromRoute('user.login'));
        
        /** @var \Psr\Http\Message\ResponseInterface $response */
        $response = $this->getHttpClient()
            ->post($url, [
            'form_params' => $post,
            'http_errors' => FALSE,
            'cookies' => FALSE,
            'allow_redirects' => FALSE,
        ]);
        // Follow the location header.
        $this->drupalGet($response->getHeader('location')[0]);
        $this->assertSession()
            ->statusCodeEquals(403);
        $this->assertSession()
            ->pageTextContains('To log in to this site, your browser must accept cookies from the domain');
    }
    
    /**
     * Make an unsuccessful login attempt.
     *
     * @param \Drupal\user\Entity\User $account
     *   A user object with name and passRaw attributes for the login attempt.
     * @param string $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.
     *
     * @internal
     */
    public function assertFailedLogin(User $account, ?string $flood_trigger = NULL) : void {
        $database = \Drupal::database();
        $edit = [
            'name' => $account->getAccountName(),
            'pass' => $account->passRaw,
        ];
        $this->drupalGet('user/login');
        $this->submitForm($edit, 'Log in');
        if (isset($flood_trigger)) {
            $this->assertSession()
                ->statusCodeEquals(403);
            $this->assertSession()
                ->fieldNotExists('pass');
            $last_log = $database->select('watchdog', 'w')
                ->fields('w', [
                'message',
            ])
                ->condition('type', 'user')
                ->orderBy('wid', 'DESC')
                ->range(0, 1)
                ->execute()
                ->fetchField();
            if ($flood_trigger == 'user') {
                $this->assertSession()
                    ->pageTextMatches("/There (has|have) been more than \\w+ failed login attempt.* for this account. It is temporarily blocked. Try again later or request a new password./");
                $this->assertSession()
                    ->elementExists('css', 'body.maintenance-page');
                $this->assertSession()
                    ->linkExists("request a new password");
                $this->assertSession()
                    ->linkByHrefExists(Url::fromRoute('user.pass')->toString());
                $this->assertEquals('Flood control blocked login attempt for uid %uid from %ip', $last_log, 'A watchdog message was logged for the login attempt blocked by flood control per user.');
            }
            else {
                // No uid, so the limit is IP-based.
                $this->assertSession()
                    ->pageTextContains("Too many failed login attempts from your IP address. This IP address is temporarily blocked. Try again later or request a new password.");
                $this->assertSession()
                    ->elementExists('css', 'body.maintenance-page');
                $this->assertSession()
                    ->linkExists("request a new password");
                $this->assertSession()
                    ->linkByHrefExists(Url::fromRoute('user.pass')->toString());
                $this->assertEquals('Flood control blocked login attempt from %ip', $last_log, 'A watchdog message was logged for the login attempt blocked by flood control per IP.');
            }
        }
        else {
            $this->assertSession()
                ->statusCodeEquals(200);
            $this->assertSession()
                ->fieldValueEquals('pass', '');
            $this->assertSession()
                ->pageTextContains('Unrecognized username or password. Forgot your password?');
        }
    }
    
    /**
     * Reset user password.
     *
     * @param object $user
     *   A user object.
     */
    public function resetUserPassword($user) {
        $this->drupalGet('user/password');
        $edit['name'] = $user->getDisplayName();
        $this->submitForm($edit, 'Submit');
        $_emails = $this->drupalGetMails();
        $email = end($_emails);
        $urls = [];
        preg_match('#.+user/reset/.+#', $email['body'], $urls);
        $resetURL = $urls[0];
        $this->drupalGet($resetURL);
        $this->submitForm([], 'Log in');
    }
    
    /**
     * Tests that user login form has the autocomplete attributes.
     */
    public function testAutocompleteHtmlAttributes() : void {
        $this->drupalGet('user/login');
        $name_field = $this->getSession()
            ->getPage()
            ->findField('name');
        $pass_field = $this->getSession()
            ->getPage()
            ->findField('pass');
        $this->assertEquals('username', $name_field->getAttribute('autocomplete'));
        $this->assertEquals('current-password', $pass_field->getAttribute('autocomplete'));
    }

}