--- /dev/null
+<?php
+
+namespace Drupal\user\Form;
+
+use Drupal\Core\Flood\FloodInterface;
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Render\RendererInterface;
+use Drupal\user\UserAuthInterface;
+use Drupal\user\UserStorageInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a user login form.
+ */
+class UserLoginForm extends FormBase {
+
+ /**
+ * The flood service.
+ *
+ * @var \Drupal\Core\Flood\FloodInterface
+ */
+ protected $flood;
+
+ /**
+ * The user storage.
+ *
+ * @var \Drupal\user\UserStorageInterface
+ */
+ protected $userStorage;
+
+ /**
+ * The user authentication object.
+ *
+ * @var \Drupal\user\UserAuthInterface
+ */
+ protected $userAuth;
+
+ /**
+ * The renderer.
+ *
+ * @var \Drupal\Core\Render\RendererInterface
+ */
+ protected $renderer;
+
+ /**
+ * Constructs a new UserLoginForm.
+ *
+ * @param \Drupal\Core\Flood\FloodInterface $flood
+ * The flood service.
+ * @param \Drupal\user\UserStorageInterface $user_storage
+ * The user storage.
+ * @param \Drupal\user\UserAuthInterface $user_auth
+ * The user authentication object.
+ * @param \Drupal\Core\Render\RendererInterface $renderer
+ * The renderer.
+ */
+ public function __construct(FloodInterface $flood, UserStorageInterface $user_storage, UserAuthInterface $user_auth, RendererInterface $renderer) {
+ $this->flood = $flood;
+ $this->userStorage = $user_storage;
+ $this->userAuth = $user_auth;
+ $this->renderer = $renderer;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container) {
+ return new static(
+ $container->get('flood'),
+ $container->get('entity.manager')->getStorage('user'),
+ $container->get('user.auth'),
+ $container->get('renderer')
+ );
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFormId() {
+ return 'user_login_form';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildForm(array $form, FormStateInterface $form_state) {
+ $config = $this->config('system.site');
+
+ // Display login form:
+ $form['name'] = [
+ '#type' => 'textfield',
+ '#title' => $this->t('Username'),
+ '#size' => 60,
+ '#maxlength' => USERNAME_MAX_LENGTH,
+ '#description' => $this->t('Enter your @s username.', ['@s' => $config->get('name')]),
+ '#required' => TRUE,
+ '#attributes' => [
+ 'autocorrect' => 'none',
+ 'autocapitalize' => 'none',
+ 'spellcheck' => 'false',
+ 'autofocus' => 'autofocus',
+ ],
+ ];
+
+ $form['pass'] = [
+ '#type' => 'password',
+ '#title' => $this->t('Password'),
+ '#size' => 60,
+ '#description' => $this->t('Enter the password that accompanies your username.'),
+ '#required' => TRUE,
+ ];
+
+ $form['actions'] = ['#type' => 'actions'];
+ $form['actions']['submit'] = ['#type' => 'submit', '#value' => $this->t('Log in')];
+
+ $form['#validate'][] = '::validateName';
+ $form['#validate'][] = '::validateAuthentication';
+ $form['#validate'][] = '::validateFinal';
+
+ $this->renderer->addCacheableDependency($form, $config);
+
+ return $form;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitForm(array &$form, FormStateInterface $form_state) {
+ $account = $this->userStorage->load($form_state->get('uid'));
+
+ // A destination was set, probably on an exception controller,
+ if (!$this->getRequest()->request->has('destination')) {
+ $form_state->setRedirect(
+ 'entity.user.canonical',
+ ['user' => $account->id()]
+ );
+ }
+ else {
+ $this->getRequest()->query->set('destination', $this->getRequest()->request->get('destination'));
+ }
+
+ user_login_finalize($account);
+ }
+
+ /**
+ * Sets an error if supplied username has been blocked.
+ */
+ public function validateName(array &$form, FormStateInterface $form_state) {
+ if (!$form_state->isValueEmpty('name') && user_is_blocked($form_state->getValue('name'))) {
+ // Blocked in user administration.
+ $form_state->setErrorByName('name', $this->t('The username %name has not been activated or is blocked.', ['%name' => $form_state->getValue('name')]));
+ }
+ }
+
+ /**
+ * Checks supplied username/password against local users table.
+ *
+ * If successful, $form_state->get('uid') is set to the matching user ID.
+ */
+ public function validateAuthentication(array &$form, FormStateInterface $form_state) {
+ $password = trim($form_state->getValue('pass'));
+ $flood_config = $this->config('user.flood');
+ if (!$form_state->isValueEmpty('name') && strlen($password) > 0) {
+ // Do not allow any login from the current user's IP if the limit has been
+ // reached. Default is 50 failed attempts allowed in one hour. This is
+ // independent of the per-user limit to catch attempts from one IP to log
+ // in to many different user accounts. We have a reasonably high limit
+ // since there may be only one apparent IP for all users at an institution.
+ if (!$this->flood->isAllowed('user.failed_login_ip', $flood_config->get('ip_limit'), $flood_config->get('ip_window'))) {
+ $form_state->set('flood_control_triggered', 'ip');
+ return;
+ }
+ $accounts = $this->userStorage->loadByProperties(['name' => $form_state->getValue('name'), 'status' => 1]);
+ $account = reset($accounts);
+ if ($account) {
+ if ($flood_config->get('uid_only')) {
+ // Register flood events based on the uid only, so they apply for any
+ // IP address. This is the most secure option.
+ $identifier = $account->id();
+ }
+ else {
+ // The default identifier is a combination of uid and IP address. This
+ // is less secure but more resistant to denial-of-service attacks that
+ // could lock out all users with public user names.
+ $identifier = $account->id() . '-' . $this->getRequest()->getClientIP();
+ }
+ $form_state->set('flood_control_user_identifier', $identifier);
+
+ // Don't allow login if the limit for this user has been reached.
+ // Default is to allow 5 failed attempts every 6 hours.
+ if (!$this->flood->isAllowed('user.failed_login_user', $flood_config->get('user_limit'), $flood_config->get('user_window'), $identifier)) {
+ $form_state->set('flood_control_triggered', 'user');
+ return;
+ }
+ }
+ // We are not limited by flood control, so try to authenticate.
+ // Store $uid in form state as a flag for self::validateFinal().
+ $uid = $this->userAuth->authenticate($form_state->getValue('name'), $password);
+ $form_state->set('uid', $uid);
+ }
+ }
+
+ /**
+ * Checks if user was not authenticated, or if too many logins were attempted.
+ *
+ * This validation function should always be the last one.
+ */
+ public function validateFinal(array &$form, FormStateInterface $form_state) {
+ $flood_config = $this->config('user.flood');
+ if (!$form_state->get('uid')) {
+ // Always register an IP-based failed login event.
+ $this->flood->register('user.failed_login_ip', $flood_config->get('ip_window'));
+ // Register a per-user failed login event.
+ if ($flood_control_user_identifier = $form_state->get('flood_control_user_identifier')) {
+ $this->flood->register('user.failed_login_user', $flood_config->get('user_window'), $flood_control_user_identifier);
+ }
+
+ if ($flood_control_triggered = $form_state->get('flood_control_triggered')) {
+ if ($flood_control_triggered == 'user') {
+ $form_state->setErrorByName('name', $this->formatPlural($flood_config->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' => $this->url('user.pass')]));
+ }
+ else {
+ // We did not find a uid, so the limit is IP-based.
+ $form_state->setErrorByName('name', $this->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' => $this->url('user.pass')]));
+ }
+ }
+ else {
+ // Use $form_state->getUserInput() in the error message to guarantee
+ // that we send exactly what the user typed in. The value from
+ // $form_state->getValue() may have been modified by validation
+ // handlers that ran earlier than this one.
+ $user_input = $form_state->getUserInput();
+ $query = isset($user_input['name']) ? ['name' => $user_input['name']] : [];
+ $form_state->setErrorByName('name', $this->t('Unrecognized username or password. <a href=":password">Forgot your password?</a>', [':password' => $this->url('user.pass', [], ['query' => $query])]));
+ $accounts = $this->userStorage->loadByProperties(['name' => $form_state->getValue('name')]);
+ if (!empty($accounts)) {
+ $this->logger('user')->notice('Login attempt failed for %user.', ['%user' => $form_state->getValue('name')]);
+ }
+ else {
+ // If the username entered is not a valid user,
+ // only store the IP address.
+ $this->logger('user')->notice('Login attempt failed from %ip.', ['%ip' => $this->getRequest()->getClientIp()]);
+ }
+ }
+ }
+ elseif ($flood_control_user_identifier = $form_state->get('flood_control_user_identifier')) {
+ // Clear past failures for this user so as not to block a user who might
+ // log in and out more than once in an hour.
+ $this->flood->clear('user.failed_login_user', $flood_control_user_identifier);
+ }
+ }
+
+}
projects / yaffs-website / blobdiff