diff --git a/composer.json b/composer.json
index 22dc228ae..ddd896fc7 100644
--- a/composer.json
+++ b/composer.json
@@ -57,7 +57,6 @@
         "drupal/seckit": "^2.0",
         "drupal/security_review": "1.x-dev",
         "drupal/shield": "^1.2",
-        "drupal/slack_invite": "^2.0",
         "drupal/stage_file_proxy": "^1.0@RC",
         "drupal/token": "^1.5",
         "drupal/upgrade_status": "^3.0@beta",
diff --git a/composer.lock b/composer.lock
index a7119d2a0..c485bef44 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "777a905ed872ba8260f75187b94e050d",
+    "content-hash": "6d62439fa858dbb8f0d5b7c2f2ca570c",
     "packages": [
         {
             "name": "acquia/memcache-settings",
@@ -5498,50 +5498,6 @@
                 "source": "https://git.drupalcode.org/project/shield"
             }
         },
-        {
-            "name": "drupal/slack_invite",
-            "version": "2.0.0",
-            "source": {
-                "type": "git",
-                "url": "https://git.drupalcode.org/project/slack_invite.git",
-                "reference": "2.0.0"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://ftp.drupal.org/files/projects/slack_invite-2.0.0.zip",
-                "reference": "2.0.0",
-                "shasum": "9d3ace0798782dc1e9421bd53d73c7222d5cce42"
-            },
-            "require": {
-                "drupal/core": "^8.8 || ^9"
-            },
-            "type": "drupal-module",
-            "extra": {
-                "drupal": {
-                    "version": "2.0.0",
-                    "datestamp": "1605030284",
-                    "security-coverage": {
-                        "status": "covered",
-                        "message": "Covered by Drupal's security advisory policy"
-                    }
-                }
-            },
-            "notification-url": "https://packages.drupal.org/8/downloads",
-            "license": [
-                "GPL-2.0-or-later"
-            ],
-            "authors": [
-                {
-                    "name": "BTMash",
-                    "homepage": "https://www.drupal.org/user/60422"
-                }
-            ],
-            "description": "Invite your users to your slack team",
-            "homepage": "https://www.drupal.org/project/slack_invite",
-            "support": {
-                "source": "https://git.drupalcode.org/project/slack_invite"
-            }
-        },
         {
             "name": "drupal/stage_file_proxy",
             "version": "1.2.0",
@@ -11507,6 +11463,6 @@
     "platform": {
         "php": ">=7.4"
     },
-    "platform-dev": [],
-    "plugin-api-version": "2.3.0"
+    "platform-dev": {},
+    "plugin-api-version": "2.9.0"
 }
diff --git a/docroot/modules/custom/slack_invite/config/install/slack_invite.settings.yml b/docroot/modules/custom/slack_invite/config/install/slack_invite.settings.yml
new file mode 100644
index 000000000..96dfc4883
--- /dev/null
+++ b/docroot/modules/custom/slack_invite/config/install/slack_invite.settings.yml
@@ -0,0 +1,6 @@
+token: ""
+hostname: ""
+twostep:
+  enabled: FALSE
+  channel: ""
+  message: "!email has requested an invitation to the Slack team. Click the following link to approve: !url"
diff --git a/docroot/modules/custom/slack_invite/slack_invite.info.yml b/docroot/modules/custom/slack_invite/slack_invite.info.yml
new file mode 100644
index 000000000..8895a611a
--- /dev/null
+++ b/docroot/modules/custom/slack_invite/slack_invite.info.yml
@@ -0,0 +1,6 @@
+name: Slack Invite
+type: module
+description: 'Invite your users to your slack team'
+package: Custom
+core_version_requirement: ^9 || ^10 || ^11
+
diff --git a/docroot/modules/custom/slack_invite/slack_invite.links.menu.yml b/docroot/modules/custom/slack_invite/slack_invite.links.menu.yml
new file mode 100644
index 000000000..4fde6ca0e
--- /dev/null
+++ b/docroot/modules/custom/slack_invite/slack_invite.links.menu.yml
@@ -0,0 +1,5 @@
+slack_invite.settingss:
+  title: 'Slack Invite'
+  parent: system.admin_config_services
+  description: 'Slack Invite Settings'
+  route_name: slack_invite.settings
diff --git a/docroot/modules/custom/slack_invite/slack_invite.module b/docroot/modules/custom/slack_invite/slack_invite.module
new file mode 100644
index 000000000..1b4ee3e2f
--- /dev/null
+++ b/docroot/modules/custom/slack_invite/slack_invite.module
@@ -0,0 +1,42 @@
+<?php
+
+/**
+ * @file
+ * Primarily Drupal hooks and global API functions to manipulate slack invite.
+ *
+ * This is the main module file for Slack Invite.
+ */
+
+
+define('SLACK_INVITE_ALREADY_IN_TEAM', 'already_in_team');
+define('SLACK_INVITE_SENT_RECENTLY', 'sent_recently');
+define('SLACK_INVITE_ALREADY_INVITED', 'already_invited');
+
+/**
+ * Sends slack invite to email address.
+ */
+function _slack_invite_send_invite($email) {
+  $team_hostname = variable_get('slack_invite_hostname', '');
+  $api_url = "https://{$team_hostname}.slack.com/api/users.admin.invite?t=" . time();
+
+  $data = [
+    '_attempts' => 1,
+    'email' => $email,
+    'set_active' => 'true',
+    'token' => variable_get('slack_invite_token', ''),
+  ];
+
+  $data['channels'] = variable_get('slack_invite_channels', '');
+  if (empty($data['channels'])) {
+    unset($data['channels']);
+  }
+
+  $data = drupal_http_build_query($data);
+  $options = [
+    'method' => 'POST',
+    'headers' => ['Content-Type' => 'application/x-www-form-urlencoded'],
+    'data' => $data,
+  ];
+
+  return drupal_http_request("{$api_url}", $options);
+}
diff --git a/docroot/modules/custom/slack_invite/slack_invite.permissions.yml b/docroot/modules/custom/slack_invite/slack_invite.permissions.yml
new file mode 100644
index 000000000..47869f4a7
--- /dev/null
+++ b/docroot/modules/custom/slack_invite/slack_invite.permissions.yml
@@ -0,0 +1,7 @@
+administer slack invite:
+  title: 'Administer Slack Invite Settings.'
+  description: 'Administer the Slack Invite Settings.'
+
+approve slack invite:
+  title: 'Approve Slack Invites.'
+  description: 'Approve two-step Slack invitations.'
diff --git a/docroot/modules/custom/slack_invite/slack_invite.routing.yml b/docroot/modules/custom/slack_invite/slack_invite.routing.yml
new file mode 100644
index 000000000..b9e16fe59
--- /dev/null
+++ b/docroot/modules/custom/slack_invite/slack_invite.routing.yml
@@ -0,0 +1,15 @@
+slack_invite.settings:
+  path: '/admin/config/services/slack-invite'
+  defaults:
+    _form: 'Drupal\slack_invite\Form\SlackInviteSettingsForm'
+    _title: 'Slack Invite Settings'
+  requirements:
+    _permission: 'administer slack invite'
+
+slack_invite.twostep:
+  path: '/slack_invite/{email}/{token}'
+  defaults:
+    _form: 'Drupal\slack_invite\Form\SlackInviteTwoStepApproveForm'
+    _title: 'Approve Slack invitation'
+  requirements:
+    _custom_access: 'Drupal\slack_invite\Form\SlackInviteTwoStepApproveForm::access'
diff --git a/docroot/modules/custom/slack_invite/slack_invite.services.yml b/docroot/modules/custom/slack_invite/slack_invite.services.yml
new file mode 100644
index 000000000..389293e56
--- /dev/null
+++ b/docroot/modules/custom/slack_invite/slack_invite.services.yml
@@ -0,0 +1,3 @@
+services:
+  slack_invite:
+    class: Drupal\slack_invite\SlackInvite
diff --git a/docroot/modules/custom/slack_invite/src/Form/SlackInviteForm.php b/docroot/modules/custom/slack_invite/src/Form/SlackInviteForm.php
new file mode 100644
index 000000000..5fdcc0e8b
--- /dev/null
+++ b/docroot/modules/custom/slack_invite/src/Form/SlackInviteForm.php
@@ -0,0 +1,68 @@
+<?php
+/**
+ * @file
+ * Contains \Drupal\slack_invite\Form\SlackInviteForm.
+ */
+
+namespace Drupal\slack_invite\Form;
+
+use Drupal\Core\Http\Client;
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Exception;
+use Drupal\Core\Url;
+
+/**
+ * Builds the search form for the search block.
+ */
+class SlackInviteForm extends FormBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormID() {
+    return 'slack_invite_form';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    $config = $this->config('slack_invite.settings');
+
+    $form['#action'] = Url::fromRoute('<current>', ['query' => $this->getDestinationArray(), 'external' => FALSE])->toString();
+    $form['slack_email'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Email'),
+      '#description' => $this->t('Enter email address for slack invite'),
+      '#required' => TRUE,
+    ];
+
+    $form['actions'] = [
+      '#type' => 'actions',
+    ];
+    $form['actions']['submit'] = [
+      '#type' => 'submit',
+      '#value' => $this->t('Send')
+    ];
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validateForm(array &$form, FormStateInterface $form_state) {
+    $email = $form_state->getValue('slack_email');
+    if (!\Drupal::service('email.validator')->isValid($email)) {
+      $form_state->setErrorByName('slack_email', $this->t('Enter email address in valid format (ex. example@example.com)'));
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    $slack_invite = \Drupal::service('slack_invite');
+    $slack_invite->send($form_state->getValue('slack_email'));
+  }
+}
diff --git a/docroot/modules/custom/slack_invite/src/Form/SlackInviteSettingsForm.php b/docroot/modules/custom/slack_invite/src/Form/SlackInviteSettingsForm.php
new file mode 100644
index 000000000..d9801ec63
--- /dev/null
+++ b/docroot/modules/custom/slack_invite/src/Form/SlackInviteSettingsForm.php
@@ -0,0 +1,166 @@
+<?php
+/**
+ * @file
+ * Contains \Drupal\slack_invite\Form\SlackInviteSettingsForm.
+ */
+
+namespace Drupal\slack_invite\Form;
+
+use Drupal\Core\Http\Client;
+use Drupal\Core\Form\ConfigFormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Exception;
+
+/**
+ * Configure locale settings for this site.
+ */
+class SlackInviteSettingsForm extends ConfigFormBase {
+  /**
+   * {@inheritdoc}
+   */
+  protected function getEditableConfigNames() {
+    return ['slack_invite.settings'];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormID() {
+    return 'slack_invite_settings';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    $config = $this->config('slack_invite.settings');
+
+    $form['slack_invite_token'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Slack Web API Token'),
+      '#description' => $this->t("Enter the Web API token you get from your team domain. Please ensure that the token has the required 'admin' scope to send out email invites."),
+      '#default_value' => $config->get('token'),
+      '#required' => TRUE,
+    ];
+
+    $form['slack_invite_hostname'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Slack Domain Hostname'),
+      '#description' => $this->t('Enter your slack team domain (ex. if your domain is https://drupal.slack.com, you would enter "drupal" minus the quotations).'),
+      '#default_value' => $config->get('hostname'),
+      '#required' => TRUE,
+    ];
+
+    $form['slack_bypass_check'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Bypass credential check'),
+      '#description' => $this->t('Bypass checking that token and hostname combination are valid'),
+    ];
+
+    $form['slack_twostep'] = [
+      '#type' => 'details',
+      '#title' => $this->t('Two-step approval'),
+      '#open' => TRUE,
+      '#tree' => TRUE,
+    ];
+
+    $twostep = $config->get('twostep');
+    $form['slack_twostep']['enabled'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Enable two-step approval'),
+      '#default_value' => $twostep['enabled'],
+    ];
+
+    $form['slack_twostep']['channel'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Channel'),
+      '#description' => $this->t('A slack channel name or id in which the invitation approval request will be sent'),
+      '#default_value' => $twostep['channel'],
+      '#states' => [
+        'invisible' => [
+          ':input[name="slack_twostep[enabled]"]' => ['checked' => FALSE],
+        ],
+      ],
+    ];
+
+    $form['slack_twostep']['message'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Message'),
+      '#description' => $this->t('A message to sent to the above channel'),
+      '#default_value' => $twostep['message'],
+      '#states' => [
+        'invisible' => [
+          ':input[name="slack_twostep[enabled]"]' => ['checked' => FALSE],
+        ],
+      ],
+    ];
+
+    return parent::buildForm($form, $form_state);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validateForm(array &$form, FormStateInterface $form_state) {
+    if ($form_state->getValue('slack_twostep')['enabled']) {
+      // Validate channel.
+      if (empty($form_state->getValue('slack_twostep')['channel'])) {
+        $form_state->setError($form['slack_twostep']['channel'], $this->t('Channel field is required when two-step approval is enabled.'));
+      }
+
+      // Validate message.
+      if (empty($form_state->getValue('slack_twostep')['message'])) {
+        $form_state->setError($form['slack_twostep']['message'], $this->t('Message field is required when two-step approval is enabled.'));
+      }
+    }
+
+    if ($form_state->getValue('slack_bypass_check')) {
+      return;
+    }
+    $team_hostname = $form_state->getValue('slack_invite_hostname');
+    $token = $form_state->getValue('slack_invite_token');
+    $api_url = "https://{$team_hostname}.slack.com/api/api.test";
+
+    $data = [
+      'form_params' => [
+        '_attempts' => 1,
+        'token' => $token,
+      ],
+    ];
+
+    try {
+      $client = \Drupal::httpClient();
+      $response = $client->request('POST', $api_url, $data);
+      // Expected result.
+      $response_data = json_decode('' . $response->getBody());
+      if ($response_data->ok !== TRUE) {
+        throw new Exception($this->t('Please check the token and hostname; unable to test request'));
+      }
+      // Ensure the correct scope is set.
+      if ($response->hasHeader('x-oauth-scopes')) {
+        $scopes = explode(',', $response->getHeader('x-oauth-scopes')[0]);
+        if (!in_array('admin', $scopes)) {
+          throw new Exception($this->t('The supplied token is missing the required scope: admin'));
+        }
+      }
+    }
+    catch (Exception $e) {
+      $form_state->setErrorByName('slack_invite_token', $e->getMessage());
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    $values = $form_state->getValues();
+
+    $config = $this->config('slack_invite.settings');
+    $config->set('token', $values['slack_invite_token'])
+      ->set('hostname', $values['slack_invite_hostname'])
+      ->set('twostep', $values['slack_twostep'])
+      ->save();
+    parent::submitForm($form, $form_state);
+  }
+
+}
diff --git a/docroot/modules/custom/slack_invite/src/Form/SlackInviteTwoStepApproveForm.php b/docroot/modules/custom/slack_invite/src/Form/SlackInviteTwoStepApproveForm.php
new file mode 100644
index 000000000..fb05c6323
--- /dev/null
+++ b/docroot/modules/custom/slack_invite/src/Form/SlackInviteTwoStepApproveForm.php
@@ -0,0 +1,72 @@
+<?php
+/**
+ * @file
+ * Contains \Drupal\slack_invite\Form\SlackInviteTwoStepApproveForm.
+ */
+
+namespace Drupal\slack_invite\Form;
+
+use Drupal\Core\Access\AccessResult;
+use Drupal\Core\Form\ConfirmFormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Url;
+
+/**
+ * Class SlackInviteTwoStepApproveForm
+ * @package Drupal\slack_invite\Form
+ */
+class SlackInviteTwoStepApproveForm extends ConfirmFormBase {
+  protected $email = NULL;
+  protected $token = NULL;
+
+  /**
+   * SlackInviteTwoStepApproveForm constructor.
+   */
+  public function __construct() {
+    $this->email = \Drupal::routeMatch()->getParameter('email');
+    $this->token = \Drupal::routeMatch()->getParameter('token');
+  }
+
+  /**
+   * Access check for form route.
+   */
+  public function access(AccountInterface $account) {
+    $permission = $account->hasPermission('approve slack invite');
+
+    $slack_invite = \Drupal::service('slack_invite');
+    $token = $this->token == $slack_invite->getEmailToken($this->email);
+
+    return AccessResult::allowedIf($permission && $token);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormID() {
+    return 'slack_invite_twostep_approve_form';
+  }
+
+  /**
+   * @inheritdoc
+   */
+  public function getCancelUrl() {
+    return Url::fromRoute('<front>');
+  }
+
+  /**
+   * @inheritdoc
+   */
+  public function getQuestion() {
+    return $this->t('Are you sure you want to invite %email to the Slack team?', ['%email' => $this->email]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    $slack_invite = \Drupal::service('slack_invite');
+    $slack_invite->send(\Drupal::routeMatch()->getParameter('email'), TRUE);
+    $form_state->setRedirectUrl($this->getCancelUrl());
+  }
+}
diff --git a/docroot/modules/custom/slack_invite/src/Plugin/Block/SlackInviteFormBlock.php b/docroot/modules/custom/slack_invite/src/Plugin/Block/SlackInviteFormBlock.php
new file mode 100644
index 000000000..f186920eb
--- /dev/null
+++ b/docroot/modules/custom/slack_invite/src/Plugin/Block/SlackInviteFormBlock.php
@@ -0,0 +1,30 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\slack_invite\Plugin\Block\SlackInviteFormBlock.
+ */
+
+namespace Drupal\slack_invite\Plugin\Block;
+
+use Drupal\Core\Block\BlockBase;
+
+/**
+ * Provides a 'Slack Invite form' block.
+ *
+ * @Block(
+ *   id = "slack_invite_form_block",
+ *   admin_label = @Translation("Slack Invite Form"),
+ *   category = @Translation("Forms")
+ * )
+ */
+class SlackInviteFormBlock extends BlockBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function build() {
+    return \Drupal::formBuilder()->getForm('Drupal\slack_invite\Form\SlackInviteForm');
+  }
+
+}
diff --git a/docroot/modules/custom/slack_invite/src/SlackInvite.php b/docroot/modules/custom/slack_invite/src/SlackInvite.php
new file mode 100644
index 000000000..8c5018bba
--- /dev/null
+++ b/docroot/modules/custom/slack_invite/src/SlackInvite.php
@@ -0,0 +1,172 @@
+<?php
+
+/**
+ * @file
+ * Contains the \Drupal\slack_invite\SlackInvite class.
+ */
+
+namespace Drupal\slack_invite;
+
+use Drupal\Component\Utility\Crypt;
+use Drupal\Core\Site\Settings;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Drupal\Core\Url;
+
+/**
+ * Class SlackInvite
+ * @package Drupal\slack_invite
+ */
+class SlackInvite {
+
+  use StringTranslationTrait;
+
+  var $config = [];
+  var $email = NULL;
+
+  /**
+   * @param            $email
+   * @param bool|FALSE $direct
+   */
+  public function send($email, $direct = FALSE) {
+    $this->email = $email;
+    $this->config = \Drupal::config('slack_invite.settings');
+    $method = !$this->config->get('twostep')['enabled'] ? 'sendDirect' : 'sendTwoStep';
+    if ($direct == TRUE) {
+      $method = 'sendDirect';
+    }
+    call_user_func([$this, $method]);
+  }
+
+  /**
+   * Send the invite directly to the user.
+   */
+  protected function sendDirect() {
+    $team_hostname = $this->config->get('hostname');
+    $api_url = "https://{$team_hostname}.slack.com/api/users.admin.invite?t=" . time();
+
+    $data = [
+      'form_params' => [
+        '_attempts'  => 1,
+        'email'      => $this->email,
+        'set_active' => 'true',
+        'token'      => $this->config->get('token'),
+      ],
+    ];
+
+    try {
+      $client = \Drupal::httpClient();
+      $response = $client->request('POST', $api_url, $data);
+
+      $response_data = json_decode('' . $response->getBody());
+      if ($response_data->ok == TRUE) {
+        \Drupal::messenger()->addStatus(t('You will receive an email notification inviting you to join the slack team shortly.'));
+      }
+      else {
+        $message = '';
+        switch ($response_data->error) {
+          case SLACK_INVITE_ALREADY_IN_TEAM:
+            $message = $this->t('The user is already a member of the team');
+            break;
+
+          case SLACK_INVITE_SENT_RECENTLY:
+            $message = $this->t('The user was recently sent an invitation.');
+            break;
+
+          case SLACK_INVITE_ALREADY_INVITED:
+            $message = $this->t('The user is already invited.');
+            break;
+
+          default:
+            $message = $data['error'];
+            break;
+        }
+        \Drupal::messenger()->addStatus($this->t('There was an error sending your invite. Please contact the administrator with the following error details. The error message from slack was: @message', ['@message' => $message]));
+      }
+    }
+    catch (Exception $e) {
+      \Drupal::messenger()->addError($this->t('Something went wrong with the request. Please contact site administrator.'));
+    }
+  }
+
+  /**
+   * Send a two-step request for invitation to the designated Slack channel.
+   */
+  protected function sendTwoStep() {
+    $token = $this->getEmailToken($this->email);
+    $url = Url::fromRoute('slack_invite.twostep', [
+      'email' => $this->email,
+      'token' => $token,
+    ], ['absolute' => TRUE]);
+    $url = $url->toString();
+
+    $team_hostname = $this->config->get('hostname');
+    $api_url = "https://{$team_hostname}.slack.com/api/chat.postMessage?t=" . time();
+
+    $message = $this->t($this->config->get('twostep')['message'], [
+      '!email' => $this->email,
+      '!url'   => $url,
+    ]);
+
+    $data = [
+      'form_params' => [
+        '_attempts' => 1,
+        'token'     => $this->config->get('token'),
+        'channel'   => $this->config->get('twostep')['channel'],
+        'text'      => $message->render(),
+      ],
+    ];
+
+    try {
+      $client = \Drupal::httpClient();
+      $response = $client->request('POST', $api_url, $data);
+
+      $response_data = json_decode('' . $response->getBody());
+      if ($response_data->ok == TRUE) {
+        \Drupal::messenger()->addStatus($this->t('Your slack invitation request has been made and you will receive an email notification inviting you to join the slack team pending approval.'));
+      }
+      else {
+        $message = '';
+        switch ($response_data->error) {
+          default:
+            $message = $data['error'];
+            break;
+        }
+        \Drupal::messenger()->addStatus($this->t('There was an error sending your invitation request. Please contact the administrator with the following error details. The error message from slack was: @message', ['@message' => $message]));
+      }
+    }
+    catch (Exception $e) {
+      \Drupal::messenger()->addError($this->t('Something went wrong with the request. Please contact site administrator.'));
+    }
+  }
+
+  /**
+   * @param $email
+   * @return string
+   */
+  public function getEmailToken($email) {
+    // Return the first 8 characters.
+    return substr(Crypt::hmacBase64($email, $this->getPrivateKey() . $this->getHashSalt()), 0, 8);
+  }
+
+  /**
+   * Gets the Drupal private key.
+   *
+   * @return string
+   *   The Drupal private key.
+   */
+  protected function getPrivateKey() {
+    return \Drupal::service('private_key')->get();
+  }
+
+  /**
+   * Gets a salt useful for hardening against SQL injection.
+   *
+   * @return string
+   *   A salt based on information in settings.php, not in the database.
+   *
+   * @throws \RuntimeException
+   */
+  protected function getHashSalt() {
+    return Settings::getHashSalt();
+  }
+}