Accounts with limits: a Newznab key and a tier per user, daily API and NZB counts, invites

ACCESS=accounts (config/access.ts; open stays the default and behaves as
before): Newznab and the catalog's releases routes name a user (apikey or
the web interface's token), whose tier sets searches and NZBs per UTC day
(Newznab 500/501, the catalog 429) and how far back they see (102/403).
Counted in one upsert per use, so the last one can't be taken twice;
caps, stats and refused requests aren't counted. Signup takes an invite
(SIGNUP), which may give a tier; ace access:invite, access:tier (extends a
running tier), access:suspend. The web interface signs in and shows the
day's usage and the Newznab key.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/controllers/new_account_controller.ts

@@ -1,13 +1,36 @@
 import User from '#models/user'
+import db from '@adonisjs/lucid/services/db'
 import { signupValidator } from '#validators/user'
 import type { HttpContext } from '@adonisjs/core/http'
 import UserTransformer from '#transformers/user_transformer'
+import AccessService from '#services/access_service'
+
+class InviteGone extends Error {}
 
 export default class NewAccountController {
-  async store({ request, serialize }: HttpContext) {
-    const { fullName, email, password } = await request.validateUsing(signupValidator)
+  async store({ request, response, serialize }: HttpContext) {
+    const { fullName, email, password, invite } = await request.validateUsing(signupValidator)
+    if (AccessService.signup === 'closed') return response.forbidden({ error: 'Signup is closed' })
+    if (AccessService.signup === 'invite' && !invite) return response.forbidden({ error: 'An invite code is needed to sign up' })
 
-    const user = await User.create({ fullName, email, password })
+    // The user and their invite together: an invite that's gone rolls the signup back.
+    const user = await db
+      .transaction(async (trx) => {
+        const created = await User.create({ fullName, email, password }, { client: trx })
+        if (AccessService.signup !== 'invite') return created
+        const gives = await AccessService.redeem(invite!, created.id, trx)
+        if (!gives) throw new InviteGone()
+        if (gives.tier) {
+          AccessService.grantTier(created, gives.tier, gives.tier_days)
+          await created.useTransaction(trx).save()
+        }
+        return created
+      })
+      .catch((error) => {
+        if (error instanceof InviteGone) return null
+        throw error
+      })
+    if (!user) return response.forbidden({ error: 'Unknown or used invite code' })
     const token = await User.accessTokens.create(user)
 
     return serialize({