corbado_auth 1.2.1

Flutter package for Corbado Auth. Enables authentication on Android and iOS using passkeys.

Corbado Auth for Flutter

Getting started

A Flutter package to enable authentication through passkeys. Setting up passkey authentication requires you to have a backend that can act as a relying party. As this is quite a bit of work, the Corbado team is at your service. You can set up your relying party server just by creating and configuring your free Corbado project. The Corbado Auth package helps you to integrate your Flutter app after you have set up your Corbado project.

This package offers the following functionalities:

• keeping a user logged in even if he closes the app
• continuously updating a user's tokens (by default their lifetime is limited to 5 minutes)

Note: For an explanation on passkeys and the information flows between client, authenticator and relying party, take a look at the passkeys package.

Configuration to start the example project

These steps are required to run the example but you also need to follow them to create your own app.

iOS

1. Create an iOS app and configure the example in XCode

We need to establish trust between your iOS app and the relying party server. Your app will be identified through your Application Identifier Prefix (e.g. 9RF9KY77B2) and your Bundle Identifier (e.g. com.corbado.passkeys). You need an Apple developer account to set up both. If you haven't got one yet, set up a new account.

Note: When creating your Bundle Identifier, make sure that the "Associated Domains" capability is enabled.

Open the example in Xcode now by opening packages/passkeys/passkeys/example/ios. In Runner -> Signing & Capabilites enter your Application Identifier Prefix and your Bundle Identifier.

2. Set up Corbado project

Create a free Corbado project at the Corbado developer panel if you haven't got one yet. It will act as your relying party server.

After successful sign up, in the wizard, select 'Integration guide', 'Native / mobile app' and 'No existing users'.

3. Set up an iOS app in Corbado

Make sure that under Settings -> User interface -> Identity verification "Option 2: No verification required" is selected. This should be set by default, when selecting 'Native / mobile app' in the previous step.

Set up an iOS app at Settings -> Native apps by clicking "Add New". You will need your Application Identifier Prefix and your Bundle Identifier that we set up in step 1.

Afterwards, your relying party server will host an apple-app-site-association file at https://{PROJECT_ID}}.frontendapi.corbado.io/.well-known/apple-app-site-association. This file will by downloaded by iOS when you install your app. To tell iOS where to look for the file, we need the next step in our setup.

4. Configure your iOS project

In your Xcode workspace, you need to configure the following settings: In Signing & Capabilities tab, add the Associated Domains capability and add the following domain: webcredentials:{PROJECT_ID}.frontendapi.corbado.io Now, iOS knows where to download the apple-app-site-association file from.

If you forget about this step, the example will show you an error message like Your app is not associated with your relying party server. You have to add.... Your configuration inside Xcode should look something like in the screenshot below (you will have your own Corbado project ID and a different Bundle Identifier).

5. Start the example

flutter run --dart-define=CORBADO_PROJECT_ID=<your-corbado-project-id> lib/main.dart

If you want to run the example from your IDE, please make sure to either

• set the CORBADO_PROJECT_ID environment variable to your Corbado project ID
• replace const String.fromEnvironment('CORBADO_PROJECT_ID') directly in the example with your Corbado project ID

Android

1. Set up Corbado project

Create a free Corbado project at the Corbado developer panel if you haven't got one yet. It will act as your relying party server.

After successful sign up, in the wizard, select 'Integration guide', 'Native / mobile app' and 'No existing users'.

After creating the project you will get a Corbado project ID (e.g. pro-4268394291597054564). You will need it in the next steps.

2. Start the example

flutter run --dart-define=CORBADO_PROJECT_ID=<your-corbado-project-id> lib/main.dart

3. Set up an Android app in Corbado

Setup an Android app at Settings -> Credentials -> Native apps by clicking "Add new". You will need your Package name (e.g. com.corbado.corbadoauth.example) and your SHA-256 fingerprint (e.g. 54:4C:94:2C:E9:...).

The package name of your app is defined in example/android/app/build.gradle (applicationId). Its default value for the example app is com.corbado.corbadoauth.example.

The easiest way to find your SHA-256 fingerprint is to look into the logs of the example app. You will find a log message like Fingerprint: 54:4C:94:2C:E9:.... Copy the full SHA-256 fingerprint and use it to set up the Android app in the Corbado developer panel.

Alternatively, you can execute one of the following commands to obtain the SHA-256 fingerprint:

• macOS / Linux: keytool -list -v -keystore ~/.android/debug.keystore -alias androiddebugkey -storepass android -keypass android
• Windows: keytool -list -v -keystore "\.android\debug.keystore" -alias androiddebugkey -storepass android -keypass android

Now, you are fully set and you can start signing up with your first passkey in the example.

A closer look at the example

After following the configuration steps above, you can run the app. The first screen you will see is the login page. Here, you can create a new user account by providing an email address and clicking on 'sign up'. After providing your fingerprint / face scan, a new passkey is created and stored on your device.

You will now be logged into the app and see the home page. Your user info is represented by an id token that has been retrieved from Corbado during the sign up process. You can view that token by clicking on "token details". Here, you can observe how the token is refreshed automatically (its lifetime will increase once in a while).

You can also close and reopen the app. You should still be logged in.