class UserController

class UserController extends ControllerBase {
    
    /**
     * The date formatter service.
     *
     * @var \Drupal\Core\Datetime\DateFormatterInterface
     */
    protected $dateFormatter;
    
    /**
     * The user storage.
     *
     * @var \Drupal\user\UserStorageInterface
     */
    protected $userStorage;
    
    /**
     * The user data service.
     *
     * @var \Drupal\user\UserDataInterface
     */
    protected $userData;
    
    /**
     * A logger instance.
     *
     * @var \Psr\Log\LoggerInterface
     */
    protected $logger;
    
    /**
     * The flood service.
     *
     * @var \Drupal\Core\Flood\FloodInterface
     */
    protected $flood;
    
    /**
     * Constructs a UserController object.
     *
     * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
     *   The date formatter service.
     * @param \Drupal\user\UserStorageInterface $user_storage
     *   The user storage.
     * @param \Drupal\user\UserDataInterface $user_data
     *   The user data service.
     * @param \Psr\Log\LoggerInterface $logger
     *   A logger instance.
     * @param \Drupal\Core\Flood\FloodInterface $flood
     *   The flood service.
     */
    public function __construct(DateFormatterInterface $date_formatter, UserStorageInterface $user_storage, UserDataInterface $user_data, LoggerInterface $logger, FloodInterface $flood) {
        $this->dateFormatter = $date_formatter;
        $this->userStorage = $user_storage;
        $this->userData = $user_data;
        $this->logger = $logger;
        $this->flood = $flood;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('date.formatter'), $container->get('entity_type.manager')
            ->getStorage('user'), $container->get('user.data'), $container->get('logger.factory')
            ->get('user'), $container->get('flood'));
    }
    
    /**
     * Redirects to the user password reset form.
     *
     * In order to never disclose a reset link via a referrer header this
     * controller must always return a redirect response.
     *
     * @param \Symfony\Component\HttpFoundation\Request $request
     *   The request.
     * @param int $uid
     *   User ID of the user requesting reset.
     * @param int $timestamp
     *   The current timestamp.
     * @param string $hash
     *   Login link hash.
     *
     * @return \Symfony\Component\HttpFoundation\RedirectResponse
     *   The redirect response.
     */
    public function resetPass(Request $request, $uid, $timestamp, $hash) {
        $account = $this->currentUser();
        // When processing the one-time login link, we have to make sure that a user
        // isn't already logged in.
        if ($account->isAuthenticated()) {
            // The current user is already logged in.
            if ($account->id() == $uid) {
                user_logout();
                // We need to begin the redirect process again because logging out will
                // destroy the session.
                return $this->redirect('user.reset', [
                    'uid' => $uid,
                    'timestamp' => $timestamp,
                    'hash' => $hash,
                ]);
            }
            else {
                
                /** @var \Drupal\user\UserInterface $reset_link_user */
                if ($reset_link_user = $this->userStorage
                    ->load($uid)) {
                    $this->messenger()
                        ->addWarning($this->t('Another user (%other_user) is already logged into the site on this computer, but you tried to use a one-time link for user %resetting_user. Please <a href=":logout">log out</a> and try using the link again.', [
                        '%other_user' => $account->getAccountName(),
                        '%resetting_user' => $reset_link_user->getAccountName(),
                        ':logout' => Url::fromRoute('user.logout')->toString(),
                    ]));
                }
                else {
                    // Invalid one-time link specifies an unknown user.
                    $this->messenger()
                        ->addError($this->t('The one-time login link you clicked is invalid.'));
                }
                return $this->redirect('<front>');
            }
        }
        
        /** @var \Drupal\user\UserInterface $reset_link_user */
        $reset_link_user = $this->userStorage
            ->load($uid);
        if ($redirect = $this->determineErrorRedirect($reset_link_user, $timestamp, $hash)) {
            return $redirect;
        }
        $session = $request->getSession();
        $session->set('pass_reset_hash', $hash);
        $session->set('pass_reset_timeout', $timestamp);
        return $this->redirect('user.reset.form', [
            'uid' => $uid,
        ]);
    }
    
    /**
     * Returns the user password reset form.
     *
     * @param \Symfony\Component\HttpFoundation\Request $request
     *   The request.
     * @param int $uid
     *   User ID of the user requesting reset.
     *
     * @return array|\Symfony\Component\HttpFoundation\RedirectResponse
     *   The form structure or a redirect response.
     *
     * @throws \Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException
     *   If the pass_reset_timeout or pass_reset_hash are not available in the
     *   session. Or if $uid is for a blocked user or invalid user ID.
     */
    public function getResetPassForm(Request $request, $uid) {
        $session = $request->getSession();
        $timestamp = $session->get('pass_reset_timeout');
        $hash = $session->get('pass_reset_hash');
        // As soon as the session variables are used they are removed to prevent the
        // hash and timestamp from being leaked unexpectedly. This could occur if
        // the user does not click on the log in button on the form.
        $session->remove('pass_reset_timeout');
        $session->remove('pass_reset_hash');
        if (!$hash || !$timestamp) {
            throw new AccessDeniedHttpException();
        }
        
        /** @var \Drupal\user\UserInterface $user */
        $user = $this->userStorage
            ->load($uid);
        if ($user === NULL || !$user->isActive()) {
            // Blocked or invalid user ID, so deny access. The parameters will be in
            // the watchdog's URL for the administrator to check.
            throw new AccessDeniedHttpException();
        }
        // Time out, in seconds, until login URL expires.
        $timeout = $this->config('user.settings')
            ->get('password_reset_timeout');
        $expiration_date = $user->getLastLoginTime() ? $this->dateFormatter
            ->format($timestamp + $timeout) : NULL;
        return $this->formBuilder()
            ->getForm(UserPasswordResetForm::class, $user, $expiration_date, $timestamp, $hash);
    }
    
    /**
     * Validates user, hash, and timestamp; logs the user in if correct.
     *
     * @param int $uid
     *   User ID of the user requesting reset.
     * @param int $timestamp
     *   The current timestamp.
     * @param string $hash
     *   Login link hash.
     * @param \Symfony\Component\HttpFoundation\Request $request
     *   The request.
     *
     * @return \Symfony\Component\HttpFoundation\RedirectResponse
     *   Returns a redirect to the user edit form if the information is correct.
     *   If the information is incorrect redirects to 'user.pass' route with a
     *   message for the user.
     *
     * @throws \Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException
     *   If $uid is for a blocked user or invalid user ID.
     */
    public function resetPassLogin($uid, $timestamp, $hash, Request $request) {
        
        /** @var \Drupal\user\UserInterface $user */
        $user = $this->userStorage
            ->load($uid);
        if ($redirect = $this->determineErrorRedirect($user, $timestamp, $hash)) {
            return $redirect;
        }
        $flood_config = $this->config('user.flood');
        if ($flood_config->get('uid_only')) {
            $identifier = $user->id();
        }
        else {
            $identifier = $user->id() . '-' . $request->getClientIP();
        }
        $this->flood
            ->clear('user.failed_login_user', $identifier);
        $this->flood
            ->clear('user.http_login', $identifier);
        user_login_finalize($user);
        $this->logger
            ->notice('User %name used one-time login link at time %timestamp.', [
            '%name' => $user->getDisplayName(),
            '%timestamp' => $timestamp,
        ]);
        $this->messenger()
            ->addStatus($this->t('You have just used your one-time login link. It is no longer necessary to use this link to log in. Please set your password.'));
        // Let the user's password be changed without the current password
        // check.
        $token = Crypt::randomBytesBase64(55);
        $request->getSession()
            ->set('pass_reset_' . $user->id(), $token);
        // Clear any flood events for this user.
        $this->flood
            ->clear('user.password_request_user', $uid);
        return $this->redirect('entity.user.edit_form', [
            'user' => $user->id(),
        ], [
            'query' => [
                'pass-reset-token' => $token,
            ],
            'absolute' => TRUE,
        ]);
    }
    
    /**
     * Validates user, hash, and timestamp.
     *
     * This method allows the 'user.reset' and 'user.reset.login' routes to use
     * the same logic to check the user, timestamp and hash and redirect to the
     * same location with the same messages.
     *
     * @param \Drupal\user\UserInterface|null $user
     *   User requesting reset. NULL if the user does not exist.
     * @param int $timestamp
     *   The current timestamp.
     * @param string $hash
     *   Login link hash.
     *
     * @return \Symfony\Component\HttpFoundation\RedirectResponse|null
     *   Returns a redirect if the information is incorrect. It redirects to
     *   'user.pass' route with a message for the user.
     *
     * @throws \Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException
     *   If $uid is for a blocked user or invalid user ID.
     */
    protected function determineErrorRedirect(?UserInterface $user, int $timestamp, string $hash) : ?RedirectResponse {
        $current = REQUEST_TIME;
        // Verify that the user exists and is active.
        if ($user === NULL || !$user->isActive()) {
            // Blocked or invalid user ID, so deny access. The parameters will be in
            // the watchdog's URL for the administrator to check.
            throw new AccessDeniedHttpException();
        }
        // Time out, in seconds, until login URL expires.
        $timeout = $this->config('user.settings')
            ->get('password_reset_timeout');
        // No time out for first time login.
        if ($user->getLastLoginTime() && $current - $timestamp > $timeout) {
            $this->messenger()
                ->addError($this->t('You have tried to use a one-time login link that has expired. Please request a new one using the form below.'));
            return $this->redirect('user.pass');
        }
        elseif ($user->isAuthenticated() && $timestamp >= $user->getLastLoginTime() && $timestamp <= $current && hash_equals($hash, user_pass_rehash($user, $timestamp))) {
            // The information provided is valid.
            return NULL;
        }
        $this->messenger()
            ->addError($this->t('You have tried to use a one-time login link that has either been used or is no longer valid. Please request a new one using the form below.'));
        return $this->redirect('user.pass');
    }
    
    /**
     * Redirects users to their profile page.
     *
     * This controller assumes that it is only invoked for authenticated users.
     * This is enforced for the 'user.page' route with the '_user_is_logged_in'
     * requirement.
     *
     * @return \Symfony\Component\HttpFoundation\RedirectResponse
     *   Returns a redirect to the profile of the currently logged in user.
     */
    public function userPage() {
        return $this->redirect('entity.user.canonical', [
            'user' => $this->currentUser()
                ->id(),
        ]);
    }
    
    /**
     * Redirects users to their profile edit page.
     *
     * This controller assumes that it is only invoked for authenticated users.
     * This is typically enforced with the '_user_is_logged_in' requirement.
     *
     * @return \Symfony\Component\HttpFoundation\RedirectResponse
     *   Returns a redirect to the profile edit form of the currently logged in
     *   user.
     */
    public function userEditPage() {
        return $this->redirect('entity.user.edit_form', [
            'user' => $this->currentUser()
                ->id(),
        ], [], 302);
    }
    
    /**
     * Route title callback.
     *
     * @param \Drupal\user\UserInterface $user
     *   The user account.
     *
     * @return string|array
     *   The user account name as a render array or an empty string if $user is
     *   NULL.
     */
    public function userTitle(UserInterface $user = NULL) {
        return $user ? [
            '#markup' => $user->getDisplayName(),
            '#allowed_tags' => Xss::getHtmlTagList(),
        ] : '';
    }
    
    /**
     * Logs the current user out.
     *
     * @return \Symfony\Component\HttpFoundation\RedirectResponse
     *   A redirection to home page.
     */
    public function logout() {
        if ($this->currentUser()
            ->isAuthenticated()) {
            user_logout();
        }
        return $this->redirect('<front>');
    }
    
    /**
     * Confirms cancelling a user account via an email link.
     *
     * @param \Drupal\user\UserInterface $user
     *   The user account.
     * @param int $timestamp
     *   The timestamp.
     * @param string $hashed_pass
     *   The hashed password.
     *
     * @return \Symfony\Component\HttpFoundation\RedirectResponse
     *   A redirect response.
     */
    public function confirmCancel(UserInterface $user, $timestamp = 0, $hashed_pass = '') {
        // Time out in seconds until cancel URL expires; 24 hours = 86400 seconds.
        $timeout = 86400;
        $current = REQUEST_TIME;
        // Basic validation of arguments.
        $account_data = $this->userData
            ->get('user', $user->id());
        if (isset($account_data['cancel_method']) && !empty($timestamp) && !empty($hashed_pass)) {
            // Validate expiration and hashed password/login.
            if ($timestamp <= $current && $current - $timestamp < $timeout && $user->id() && $timestamp >= $user->getLastLoginTime() && hash_equals($hashed_pass, user_pass_rehash($user, $timestamp))) {
                $edit = [
                    'user_cancel_notify' => $account_data['cancel_notify'] ?? $this->config('user.settings')
                        ->get('notify.status_canceled'),
                ];
                user_cancel($edit, $user->id(), $account_data['cancel_method']);
                // Since user_cancel() is not invoked via Form API, batch processing
                // needs to be invoked manually and should redirect to the front page
                // after completion.
                return batch_process('<front>');
            }
            else {
                $this->messenger()
                    ->addError($this->t('You have tried to use an account cancellation link that has expired. Please request a new one using the form below.'));
                return $this->redirect('entity.user.cancel_form', [
                    'user' => $user->id(),
                ], [
                    'absolute' => TRUE,
                ]);
            }
        }
        throw new AccessDeniedHttpException();
    }

}