Make registrations configurable by env

src/config.ts

@@ -126,6 +126,10 @@ const Conf = {
       'system',
     ];
   },
+  /** Whether registrations are open or closed. */
+  get registrations() {
+    return optionalBooleanSchema.parse(Deno.env.get('DITTO_REGISTRATIONS')) ?? false;
+  },
   /** Proof-of-work configuration. */
   pow: {
     get registrations() {

src/controllers/api/accounts.ts

@@ -22,6 +22,10 @@ const createAccountSchema = z.object({
 });
 
 const createAccountController: AppController = async (c) => {
+  if (!Conf.registrations) {
+    return c.json({ error: 'Registrations are disabled.' }, 403);
+  }
+
   const pubkey = c.get('pubkey')!;
   const result = createAccountSchema.safeParse(await c.req.json());
 

src/controllers/api/instance.ts

@@ -12,7 +12,7 @@ const instanceController: AppController = (c) => {
     title: 'Ditto',
     description: 'An efficient and flexible social media server.',
     short_description: 'An efficient and flexible social media server.',
-    registrations: false,
+    registrations: Conf.registrations,
     max_toot_chars: Conf.postCharLimit,
     configuration: {
       media_attachments: {