fix: disable open signup - invite creates users directly via DB

src/lib/auth.ts

@@ -28,7 +28,8 @@ export const auth = betterAuth({
   },
   emailAndPassword: {
     enabled: true,
-    requireEmailVerification: false, // Enable later for production
+    requireEmailVerification: false,
+    disableSignUp: true, // Registration is invite-only
   },
   session: {
     expiresIn: 60 * 60 * 24 * 7, // 7 days

src/routes/invite.ts

@@ -1,8 +1,7 @@
 import { Elysia, t } from 'elysia';
 import { db } from '../db';
-import { invites, users } from '../db/schema';
+import { invites, users, accounts } from '../db/schema';
 import { eq, and } from 'drizzle-orm';
-import { auth } from '../lib/auth';
 
 export const inviteRoutes = new Elysia({ prefix: '/auth/invite' })
   // Validate invite token (public - no auth required)
@@ -18,7 +17,6 @@ export const inviteRoutes = new Elysia({ prefix: '/auth/invite' })
     }
 
     if (new Date() > invite.expiresAt) {
-      // Mark as expired
       await db.update(invites)
         .set({ status: 'expired' })
         .where(eq(invites.id, invite.id));
@@ -38,6 +36,7 @@ export const inviteRoutes = new Elysia({ prefix: '/auth/invite' })
   })
 
   // Accept invite (public - no auth required)
+  // Creates user directly in DB, bypassing Better Auth's blocked signup endpoint
   .post('/:token/accept', async ({ params, body, set }: {
     params: { token: string };
     body: { password: string; name?: string };
@@ -61,22 +60,44 @@ export const inviteRoutes = new Elysia({ prefix: '/auth/invite' })
       throw new Error('Invite has expired');
     }
 
-    // Create user via Better Auth's sign-up
+    // Check if user with this email already exists
+    const [existing] = await db.select({ id: users.id })
+      .from(users)
+      .where(eq(users.email, invite.email))
+      .limit(1);
+
+    if (existing) {
+      set.status = 409;
+      throw new Error('An account with this email already exists');
+    }
+
     try {
-      const signUpResult = await auth.api.signUpEmail({
-        body: {
-          email: invite.email,
-          password: body.password,
-          name: body.name || invite.name,
-        },
+      const now = new Date();
+      const userId = crypto.randomUUID();
+      const accountId = crypto.randomUUID();
+      const hashedPassword = await Bun.password.hash(body.password, { algorithm: 'bcrypt', cost: 10 });
+
+      // Create user record
+      await db.insert(users).values({
+        id: userId,
+        email: invite.email,
+        name: body.name || invite.name,
+        role: invite.role,
+        emailVerified: false,
+        createdAt: now,
+        updatedAt: now,
       });
 
-      // Set the user's role from the invite
-      if (signUpResult?.user?.id) {
-        await db.update(users)
-          .set({ role: invite.role })
-          .where(eq(users.id, signUpResult.user.id));
-      }
+      // Create credential account record (how Better Auth stores email/password)
+      await db.insert(accounts).values({
+        id: accountId,
+        userId,
+        accountId: userId,
+        providerId: 'credential',
+        password: hashedPassword,
+        createdAt: now,
+        updatedAt: now,
+      });
 
       // Mark invite as accepted
       await db.update(invites)
@@ -86,12 +107,11 @@ export const inviteRoutes = new Elysia({ prefix: '/auth/invite' })
       return {
         success: true,
         user: {
-          id: signUpResult.user.id,
-          email: signUpResult.user.email,
-          name: signUpResult.user.name,
+          id: userId,
+          email: invite.email,
+          name: body.name || invite.name,
           role: invite.role,
         },
-        token: signUpResult.token,
       };
     } catch (error: any) {
       set.status = 400;