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A sign-in wall on the first screen loses users. With Abrova Auth the app signs each new user in as an anonymous guest with no screen at all. The guest has a real user id from the start, so everything you store under it is theirs. When they decide to sign up, you link an e-mail and password to that same user: the id doesn't change and nothing has to be moved.

1Turn on Abrova Auth and the two methods#

In Abrova Console:

1. Settings › Products: turn on Abrova Auth.
2. Abrova Auth › Sign-in methods: turn on Anonymous and E-mail and password. For e-mail, set the shortest password (8 to 128 characters, default 8) and whether users need a verified e-mail before they can sign in.
3. Copy the public key (ab_live_…) from Project settings → Keys. Abrova Auth needs nothing else: no server, no server secret.

2Install the SDK#

Flutter

Add the package with the Abrova registry as its hosted source, then run flutter pub get:

# pubspec.yaml
dependencies:
  abrova_auth:
    hosted: https://center.abrova.ir/api/packages/abrova/pub
    version: ^0.1.1

Web

Point the @abrova scope at Abrova Center in .npmrc, then install:

# .npmrc
@abrova:registry=https://center.abrova.ir/api/packages/abrova/npm/

npm install @abrova/auth-web

3Sign the guest in at first launch#

Sign in anonymously only when nobody is signed in yet. The SDK keeps the session, so the same guest comes back on the next launch; calling signInAnonymously() on every start would create a new user each time.

Flutter

import 'package:flutter/material.dart';
import 'package:abrova_auth/abrova_auth.dart';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();

  // Restores the saved session from secure storage, without a network call.
  await AbrovaAuth.initialize('ab_live_your_api_key');

  final auth = AbrovaAuth.instance;
  if (auth.currentUser == null) {
    await auth.signInAnonymously();
  }

  runApp(const MyApp());
}

Web

On the web the session is kept in memory by default, so a guest would be lost on every reload. Keep it in localStorage for this flow, and wait for ready() before you check:

import { createAbrovaAuth, localStorageStorage } from '@abrova/auth-web';

export const auth = createAbrovaAuth({
  apiKey: 'ab_live_your_api_key',
  storage: localStorageStorage(), // the guest survives a reload
});

export async function startSession() {
  await auth.ready(); // the stored session (if any) is loaded
  if (!auth.isSignedIn) {
    await auth.signInAnonymously();
  }
  return auth.currentUserId; // ru_…
}

Store the user's data under this id from now on (currentUser.id on Flutter, currentUserId on the web). If you also use Abrova Trace, attach the id to errors: see Attach the signed-in user to errors.

4Show who is a guest#

Offer "Create an account" only to guests. The user's anonymous field is true until a method is linked, and your auth listener hears about every change:

Flutter

StreamBuilder<AbrovaAuthUser?>(
  stream: AbrovaAuth.instance.authStateChanges, // current user first, then every change
  builder: (context, snapshot) {
    final user = snapshot.data;
    if (user == null) return const SizedBox.shrink();
    return user.anonymous
        ? TextButton(onPressed: openSignUp, child: const Text('Create an account'))
        : Text('Signed in as ${user.id}');
  },
)

Web

const me = await auth.getMe(); // { id, anonymous, emailVerified, createdAt, providers }
showSignUpButton(me.anonymous); // your code

5Upgrade: link an e-mail and password#

When the guest signs up, link the e-mail and password to the signed-in guest. Don't call signUpWithEmail here: that creates a new user and leaves the guest's data behind.

Flutter

Future<void> upgrade(String email, String password) async {
  final auth = AbrovaAuth.instance;
  try {
    await auth.linkPassword(email: email, password: password);
    // Same user id. currentUser.anonymous is now false.

    // Optional: ask them to confirm the address.
    await auth.sendEmailVerification(redirectUrl: 'https://example.com/auth/verify');
  } on AbrovaAuthException catch (e) {
    switch (e.code) {
      case AbrovaAuthErrorCode.emailTaken:
        showError('This e-mail already has an account. Sign in instead?');
      case AbrovaAuthErrorCode.weakPassword:
        showError('Choose a longer, less common password.');
      case AbrovaAuthErrorCode.networkError:
        showError('No connection. Try again.');
      default:
        showError('Could not create the account.');
    }
  }
}

Web

import { isAbrovaAuthError } from '@abrova/auth-web';

export async function upgrade(email: string, password: string) {
  try {
    await auth.linkPassword({ email, password }); // same user id
    await auth.sendEmailVerification({ redirectUrl: 'https://example.com/auth/verify' });
  } catch (e) {
    if (isAbrovaAuthError(e) && e.code === 'EMAIL_TAKEN') showError('This e-mail already has an account.');
    else if (isAbrovaAuthError(e) && e.code === 'WEAK_PASSWORD') showError('Choose a longer password.');
    else throw e;
  }
}

The verification link opens your redirectUrl with ?token=…; pass the token to verifyEmail. The redirectUrl must start with one of the link addresses under Abrova Auth › Settings. Linking also starts a fresh session, which the SDK takes over by itself.

6When the e-mail already has an account#

EMAIL_TAKEN means the person signed up before, on another device or before reinstalling. Nothing is merged on its own: two users' data is never combined behind your back. What most apps do:

1. Tell the user this account already exists and offer to sign in.
2. If the guest has data worth keeping, copy it to the other account in your app first (or let the user discard it).
3. Sign in with signInWithEmail. This replaces the guest on this device: the guest is not deleted, but no device holds its session any more, so it can't be reached again.

await AbrovaAuth.instance.signInWithEmail(email: email, password: password);

Guests that never come back are removed after 90 days without a sign-in (7 to 3,650 days, under Abrova Auth › Settings › Anonymous users). Users who linked a method are never removed this way.

7Check that it worked#

1. Start the app: in Abrova Console → Abrova Auth › Users a new user appears with the method anonymous.
2. Restart the app (or reload the page): no second user appears.
3. Sign up in the app: the same user now lists password among its methods, and its id is unchanged.

Troubleshooting#