add blocker to block emails from registration

website/server/models/user/schema.js

@@ -9,9 +9,31 @@ import { schema as SubscriptionPlanSchema } from '../subscriptionPlan';
 import { schema as TagSchema } from '../tag';
 import { schema as UserNotificationSchema } from '../userNotification';
 import { schema as WebhookSchema } from '../webhook';
+import { model as Blocker } from '../blocker';
 
 const RESTRICTED_EMAIL_DOMAINS = Object.freeze(['habitica.com', 'habitrpg.com']);
 
+const BLOCKED_EMAILS = [];
+
+Blocker.watchBlockers({
+  type: 'email',
+  area: 'full',
+}, {
+  initial: true,
+}).on('change', async change => {
+  const { operation, blocker: { value } } = change;
+  if (operation === 'add') {
+    if (value && !BLOCKED_EMAILS.includes(value)) {
+      BLOCKED_EMAILS.push(value);
+    }
+  } else if (operation === 'delete') {
+    const index = BLOCKED_EMAILS.indexOf(value);
+    if (index !== -1) {
+      BLOCKED_EMAILS.splice(index, 1);
+    }
+  }
+});
+
 // User schema definition
 export const UserSchema = new Schema({
   apiToken: {
@@ -43,6 +65,12 @@ export const UserSchema = new Schema({
             return RESTRICTED_EMAIL_DOMAINS.every(domain => !lowercaseEmail.endsWith(`@${domain}`));
           },
           message: shared.i18n.t('invalidEmailDomain', { domains: RESTRICTED_EMAIL_DOMAINS.join(', ') }),
+        }, {
+          validator (email) {
+            const lowercaseEmail = email.toLowerCase();
+            return BLOCKED_EMAILS.every(block => lowercaseEmail.indexOf(block) === -1);
+          },
+          message: shared.i18n.t('emailBlockedRegistration'),
         }],
       },
       username: {