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README.md

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Okta OpenID Connect & OAuth 2.0 Library

Table of Contents

Overview

This library is for communicating with Okta as an OAuth 2.0 + OpenID Connect provider, and follows current best practice for native apps using Authorization Code Flow + PKCE.

You can learn more on the Okta + Android page in our documentation. For more information about Okta OpenID Connect & OAuth 2.0 API.

Requirements

Okta OIDC SDK supports Android API 19 and above. Chrome custom tab enabled browsers are needed by the library for browser initiated authorization. An Okta developer account is needed to run the sample. It is recommended that your app extends FragmentActivity or any extensions of it. If you are extending Activity, you have to override onActivityResult.

Installation

Add the Okta OIDC dependency to your build.gradle file:

implementation 'com.okta.android:oidc-androidx:1.0.5'

Sample app

A sample is contained within this repository. For more information on how to build, test and configure the sample, see the sample README.

Add a URI Scheme

Similar to the sample app, you must add a redirect scheme to receive sign in results from the web browser. To do this, you must define a gradle manifest placeholder in your app's build.gradle:

android.defaultConfig.manifestPlaceholders = [
    "appAuthRedirectScheme": "com.okta.oidc.example"
]

Note The SDK doesn't allow multiple apps to use the same scheme. If it detects more than one application sharing the same scheme it will throw an exception.

Configuration

First the authentication client must have a config to interact with Okta's OIDC provider. Create a OIDCConfig like the following example:

config = new OIDCConfig.Builder()
    .clientId("{clientId}")
    .redirectUri("{redirectUri}")
    .endSessionRedirectUri("{endSessionUri}")
    .scopes("openid", "profile", "offline_access")
    .discoveryUri("https://{yourOktaDomain}")
    .create();

Then create a client like the following:

WebAuthClient webClient = new Okta.WebAuthBuilder()
                .withConfig(config)
                .withContext(getApplicationContext())
                .withStorage(new SharedPreferenceStorage(this))
                .create();

After creating the client, register a callback to receive authorization results.

SessionClient sessionClient = webClient.getSessionClient();
webClient.registerCallback(new ResultCallback<AuthorizationStatus, AuthorizationException>() {
    @Override
    public void onSuccess(@NonNull AuthorizationStatus status) {
        if (status == AuthorizationStatus.AUTHORIZED) {
            //client is authorized.
            Tokens tokens = sessionClient.getTokens();
        } else if (status == AuthorizationStatus.SIGNED_OUT) {
            //this only clears the browser session.
        }
    }

    @Override
    public void onCancel() {
        //authorization canceled
    }

    @Override
    public void onError(@NonNull String msg, AuthorizationException error) {
     //error encounted
    }
}, this);

The client can now be used to authenticate users and authorize access.

Note: .well-known/openid-configuration or .well-known/oauth-authorization-server will be appended to your discoveryUri if it is missing.

  • discoveryUri is: https://{yourOktaDomain}/oauth2/${authServerId} then .well-known/oauth-authorization-server is added.
  • discoveryUri is: https://{yourOktaDomain} then .well-known/openid-configuration is added.
  • discoveryUri is: https://{yourOktaDomain}/oauth2/default then .well-known/oauth-authorization-server is added.
  • discoveryUri is: https://{yourOktaDomain}/oauth2/${authServerId}/.well-known/openid-configuration nothing is added.
  • discoveryUri is: https://{yourOktaDomain}/oauth2/${authServerId}/.well-known/oauth-authorization-server nothing is added.

For more information about the metadata returned by the different server configurations:

OpenID Connect (.well-known/openid-configuration)

OAuth 2.0 (.well-known/oauth-authorization-server)

Using JSON configuration file

You can also create a config by providing a JSON file. Create a file called okta_oidc_config.json in your application's res/raw/ directory with the following contents:

{
  "client_id": "{clientId}",
  "redirect_uri": "{redirectUri}",
  "end_session_redirect_uri": "{endSessionUri}",
  "scopes": [
    "openid",
    "profile",
    "offline_access"
  ],
  "discovery_uri": "https://{yourOktaDomain}"
}

Use this JSON file to create a configuration:

OIDCConfig config = new OIDCConfig.Builder()
    .withJsonFile(this, R.id.okta_oidc_config)
    .create();

Note: To receive a refresh_token, you must include the offline_access scope.

Sign in with a browser

The authorization flow consists of four stages.

  1. Service discovery - This uses the discovery uri to get a list of endpoints.
  2. Authorizing the user with chrome custom tabs to obtain an authorization code.
  3. Exchanging the authorizaton code for a access token, ID token, and/or refresh token.
  4. Using the tokens to interact with a resource server to access user data.

This is all done in the background by the SDK. For example to sign in you can call:

client.signIn(this, null);

The results will be returned in the registered callback. If the application needs to send extra data to the api endpoint, AuthenticationPayload can be used:

AuthenticationPayload payload = new AuthenticationPayload.Builder()
    .setLoginHint("youraccount@okta.com")
    .addParameter("max_age", "5000")
    .build();

client.signIn(this, payload);

onActivityResult override

The library uses a nested fragment to abstract the redirect callback. It uses onActivityResult to receive data from the browser. If your app overrides onActivityResult you must call super.onActivityResult() to propagate unhandled requestCode to the library's fragment.

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
    }

If your app extends Activity instead of FragmentActivity or AppCompatActivity you must override onActivityResult and pass the result to WebAuthClient.

public class PlainActivity extends Activity {
    private WebAuthClient client;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        OIDCConfig config = new OIDCConfig.Builder()
                        .withJsonFile(this, R.raw.okta_oidc_config)
                        .create();

        client = new Okta.WebAuthBuilder()
                        .withConfig(mOidcConfig)
                        .withContext(this)
                        .create();

        ResultCallback<AuthorizationStatus, AuthorizationException> callback =
            new ResultCallback<AuthorizationStatus, AuthorizationException>() {
                            @Override
                            public void onSuccess(@NonNull AuthorizationStatus status) {
                            }

                            @Override
                            public void onCancel() {
                            }

                            @Override
                            public void onError(@Nullable String msg, AuthorizationException error) {
                            }
                        };
        client.registerCallback(callback, this);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        //must pass the results back to the WebAuthClient.
        client.handleActivityResult(requestCode, resultCode, data);
    }
}

Social login

To use another identity provider such as Google or Facebook, first step up the identity provider in Okta. Once your setup is complete you can sign in using the social login provider.

AuthenticationPayload payload = new AuthenticationPayload.Builder()
    .setIdp("appID_or_clientID_of_your_idp")
    .setIdpScope("scope_of_your_idp")
    .build();

client.signIn(this, payload);

Sign in will be redirected to the page of the specified IDP.

Sign in with your own UI

If you would like to use your own in-app user interface instead of the web browser, you can do so by using a sessionToken:

AuthClient authClient = new Okta.AuthBuilder()
    .withConfig(config)
    .withContext(getApplicationContext())
    .withStorage(new SharedPreferenceStorage(this))
    .create();

After building the AuthClient you should call signIn method where you need to provide a sessionToken and RequestCallback

SessionClient sessionClient = authClient.getSessionClient();
if (!sessionClient.isAuthenticated()) {
    authClient.signIn("{sessionToken}", null, new RequestCallback<Result, AuthorizationException>() {
        @Override
        public void onSuccess(@NonNull Result result) {
            //client is now authorized.
        }

        @Override
        public void onError(String error, AuthorizationException exception) {
            //handle error
        }
    });
}

Note: To get a sessionToken, you must use Okta's Authentication API. You can use Okta Java Authentication SDK to get a sessionToken. An example of using the Authentication API can be found here. The Authentication SDK is only available for API 24 and above. If using API < 24, we recommend using [chrome custom tabs][chrome-custom-tabs] but if you must implement a native UI then we've provided a set of authn-android libraries built using bazel's desugar tool.

Sign out

If the user is signed in using the browser initiated authorization flow, then signing out is a two or three step process depending on revoking the tokens.

  1. Clear the browser session.
  2. Revoke the tokens (optional)
  3. Clear the app session (stored tokens) in memory.

If the user is signed in using a sessionToken you can skip clearing the browser.

Clear browser session

In order to clear the browser session you have to call signOutOfOkta().

    client.signOutOfOkta(this);

This clears the current browser session only. It does not remove or revoke the cached tokens stored in the client. Until the tokens are removed or revoked, the user can still access data from the resource server.

Revoke tokens (optional)

Tokens are still active (unless expired) even if you have cleared the browser session. An optional step is to revoke the tokens to make them inactive. Please see Revoke the tokens.

Clear tokens from device

Tokens can be removed from the device by simply calling:

    client.getSessionClient().clear();

After this the user is signed out.

Sign out wrapper

You can also call signOut() which wraps all these steps in one call.

 authClient.signOut(this, new RequestCallback<Integer, AuthorizationException>() {
    @Override
    public void onSuccess(@NonNull Integer result) {
        if (result == SUCCESS) {
            //signed out
        }
        if ((result & FAILED_CLEAR_SESSION) == FAILED_CLEAR_SESSION) {
            //session not cleared
        }
        if ((result & FAILED_REVOKE_ACCESS_TOKEN) == FAILED_REVOKE_ACCESS_TOKEN) {
            //access token revocation failed.
        }
        if ((result & FAILED_REVOKE_REFRESH_TOKEN) == FAILED_REVOKE_REFRESH_TOKEN) {
            //refresh token revocation failed.
        }
        if ((result & FAILED_CLEAR_DATA) == FAILED_CLEAR_DATA) {
            //failed to remove data.
        }
    }

    @Override
    public void onError(@Nullable String msg, @Nullable AuthorizationException exception) {
        //NO-OP
    }
});

If any step fails, it will still process to the next step. It is recommended to do these steps individually to give your application more control of the sign out process.

Note signOut() does not save the application state so if the activity is destroyed during these steps you should call it again to start the sign out process over.

Using the Tokens

Once the user is authorized you can use the client object to call the OIDC endpoints, in order to access this API you need to get a sessionClient

sessionClient = client.getSessionClient();

Get user information

An example of getting user information from userinfo endpoint:

sessionClient.getUserProfile(new RequestCallback<UserInfo, AuthorizationException>() {
    @Override
    public void onSuccess(@NonNull UserInfo result) {
        //handle UserInfo result.
    }

    @Override
    public void onError(String error, AuthorizationException exception) {
        //handle failed userinfo request
    }
});

In onSuccess the userinfo returned is a UserInfo with the response properties.

Performing authorized requests

Authorized request to your own server endpoints will need to add the Authorization header with the access token, prefixed by the standard OAuth 2.0 of Bearer. If you are using Android's standard HttpURLConnection you can set the headers like the following:

try {
    Tokens token = client.getSessionClient.getTokens();
    URL url = new URL("yourCustomUrl");
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    conn.setRequestProperty("Authorization", "Bearer " + token.getAccessToken());
} catch (AuthorizationException e) {
    //handle error
}

If you are using OkHttp you can set the headers in the Request like the following:

try {
    Tokens token = client.getSessionClient.getTokens();
    Request request = new Request.Builder()
        .url("yourCustomUrl")
        .addHeader("Authorization", "Bearer " + token.getAccessToken())
        .build();
} catch (AuthorizationException e) {
    //handle error
}

Refresh a Token

You can refresh the tokens with the following request:

client.getSessionClient().refreshToken(new RequestCallback<Tokens, AuthorizationException>() {
    @Override
    public void onSuccess(@NonNull Tokens result) {
        //handle success.
    }

    @Override
    public void onError(String error, AuthorizationException exception) {
        //handle request failure
    }
});

Revoking a Token

Tokens can be revoked with the following request:

try {
    Tokens token = client.getSessionClient.getTokens();
    client.getSessionClient().revokeToken(token.getRefreshToken(),
        new RequestCallback<Boolean, AuthorizationException>() {
            @Override
            public void onSuccess(@NonNull Boolean result) {
                //handle result
            }
            @Override
            public void onError(String error, AuthorizationException exception) {
                //handle request error
            }
        });
} catch (AuthorizationException e) {
    //handle error
}

Note: Access, refresh and ID tokens need to be revoked in separate requests. The request only revokes the specified token

Introspect a token

Tokens can be checked for more detailed information by using the introspect endpoint:

try {
    client.getSessionClient().introspectToken(client.getTokens().getRefreshToken(),
        TokenTypeHint.REFRESH_TOKEN, new RequestCallback<IntrospectInfo, AuthorizationException>() {
            @Override
            public void onSuccess(@NonNull IntrospectInfo result) {
                //handle introspect response.
            }

            @Override
            public void onError(String error, AuthorizationException exception) {
                //handle request error
            }
        }
    );
} catch (AuthorizationException e) {
    //handle error
}

A list of the response properties can be found here

Token management

Tokens are encrypted and securely stored in the private Shared Preferences. If you do not want AuthenticateClient to store the data you can pass in a empty interface when creating the client

client = new Okta.WebAuthBuilder()
    .withConfig(config)
    .withContext(getApplicationContext())
    .withStorage(new OktaStorage() {
                @Override
                public void save(@NonNull String key, @NonNull String value) {
                }
                @Override
                public String get(@NonNull String key) {
                    return null;
                }
                @Override
                public void delete(@NonNull String key) {
                }})
    .withTabColor(getColorCompat(R.color.colorPrimary))
    .create();

The library provides a storage interface and encryption interface. These interfaces allow the developer to override the default implementation if they wish to use custom encryption or storage mechanism. For more see the advance configuration section.

Advance configuration

The library allows customization to specific parts the SDK to meet developer needs.

Client variants

The library provides asynchronous and synchronous variant of each client type. The corresponding SessionClient created from the AuthClient will have the same asynchronous or synchronous behavior. The following shows how to create different type of clients.

WebAuthClient

WebAuthClient redirects to a chrome custom tabs enabled browser for authenticaiton. The following shows how to create a asynchronous web authentication client.

WebAuthClient webAuthClient = new Okta.WebAuthBuilder()
        .withConfig(config)
        .withContext(getApplicationContext())
        .withStorage(new SharedPreferenceStorage(this))
        .withCallbackExecutor(Executors.newSingleThreadExecutor())
        .withTabColor(Color.BLUE)
        .supportedBrowsers("com.android.chrome", "org.mozilla.firefox")
        .create();

SyncWebAuthClient

The following shows how to create synchronous web authentication client:

SyncWebAuthClient webSyncAuthClient = new Okta.SyncWebAuthBuilder()
        .withConfig(config)
        .withContext(getApplicationContext())
        .withStorage(new SharedPreferenceStorage(this))
        .withTabColor(Color.BLUE)
        .supportedBrowsers("com.android.chrome", "com.google.android.apps.chrome", "com.android.chrome.beta")
        .create();

AuthClient

AuthClient will require a sessionToken. See Sign in with your own UI for more information on how to obtain a sessionToken. The following shows how to create a asynchronous authentication client:

AuthClient authClient = new Okta.AuthBuilder()
        .withConfig(config)
        .withContext(getApplicationContext())
        .withStorage(new SharedPreferenceStorage(this))
        .withCallbackExecutor(Executors.newSingleThreadExecutor())
        .create();

SyncAuthClient

The following shows how to create synchronous authentication client:

SyncAuthClient syncAuthClient = new Okta.SyncAuthBuilder()
        .withConfig(config)
        .withContext(getApplicationContext())
        .withStorage(new SharedPreferenceStorage(this))
        .create();

Providing browser used for authorization

The default browser used for authorization is Chrome. If you want to change it FireFox, you can add this in the various Okta.WebAuthBuilder():

String SAMSUNG = "com.sec.android.app.sbrowser";
String FIREFOX = "org.mozilla.firefox";

//ANDROID_BROWSER DOES NOT SUPPORT CHROME CUSTOM TABS! Won't work.
String ANDROID_BROWSER = "com.android.browser";

client = new Okta.WebAuthBuilder()
    .withConfig(config)
    .withContext(getApplicationContext())
    .withStorage(new SharedPreferenceStorage(this))
    .withTabColor(getColorCompat(R.color.colorPrimary))
    .supportedBrowsers(FIREFOX, SAMSUNG)
    .create();

The library will attempt to use FireFox then Samsung browsers first. If none are found it will default to Chrome.

Note: The library only supports Chrome custom tab enabled browsers. If no compatible browsers are found you'll receive a AuthorizationException with a No compatible browser found message. You should handle this error by redirecting the user to download a compatible browser in the app store.

Customize HTTP requests

You can customize how HTTP connections are made by implementing the OktaHttpClient interface:

private class MyHttpClient implements OktaHttpClient {
    //Implement interface
    //...
}

client = new Okta.WebAuthBuilder()
    .withConfig(config)
    .withContext(getApplicationContext())
    .withStorage(new SharedPreferenceStorage(this))
    .withTabColor(getColorCompat(R.color.colorPrimary))
    .withOktaHttpClient(new MyHttpClient())
    .create();

For an example on using OkHttp.

Storage

The library provides storage using shared preferences. If you wish to use SQL or any other storage mechanism you can implement the storage interface and use it when creating the various AuthClient. The default behavior requires a hardware-backed keystore for encryption. If the device does not provide hardware-backed keystore the library will not store any data. If you wish to override this behavior you can set this option the Builder:

client = new Okta.WebAuthBuilder()
    .withConfig(config)
    .withContext(getApplicationContext())
    .withStorage(new MyStorage())
    .withTabColor(getColorCompat(R.color.colorPrimary))
    .setRequireHardwareBackedKeyStore(false)
    .supportedBrowsers(FIREFOX, SAMSUNG)
    .create();

Encryption

Encryption is applied to all data that is stored by the library. You can specify your own encryption algorithm with the following steps:

Build your own implementation of EncryptionManager

public class CustomEncryptionManager implements EncryptionManager {
    @Override
    public String encrypt(String data) throws GeneralSecurityException {
        //encryt data
        return encryptedData;
    }

    @Override
    public String decrypt(String encryptedData) throws GeneralSecurityException {
        if (value != null && value.length() > 0) {
            //decrypt data
            return decryptedData;
        } else {
            return null;
        }
    }
    //...
    //...
}

Provide it within selected Okta Client Builder

client = new Okta.WebAuthBuilder()
    .withConfig(config)
    .withContext(getApplicationContext())
    .withStorage(new MyStorage())
    .withTabColor(getColorCompat(R.color.colorPrimary))
    .withEncryptionManager(new CustomEncryptionManager())
    .supportedBrowsers(FIREFOX, SAMSUNG)
    .create();

This will allow the SDK to use your CustomEncryptionManager, if you want to disable encryption you can simply return the parameter that was passed into encrypt and decrypt. The SDK provides two implementations of EncryptionManager

DefaultEncryptionManager

Private keys are stored in KeyStore. Does not require device authentication to use the keys. Compatible with API19 and up. This is a RSA implementation that

GuardedEncryptionManager

Private keys are stored in KeyStore. Requires device authentication to use the keys. Compatible with API23 and up.

Hardware-backed keystore

The default EncryptionManager provides a check to see if the device supports hardware-backed keystore. If you implement your own EncryptionManager you'll have to implement this check. You can return true to tell the default storage that the device have a hardware-backed keystore. The storage and encrytion mechanisms work together to ensure that data is stored securely.

Encryption and decryption errors

Most of the encrytion errors encountered are due to the key being invalidated. This means that the initial key that was used to encrypt the data have become inaccessible. Once this happens it is impossible to recover the encrypted data. To recover from this you must clear the data:

@Override
public void onError(@Nullable String msg, AuthorizationException error) {
    if (error.type == ILLEGAL_BLOCK_SIZE &&
        error.code == EncryptionErrors.ILLEGAL_BLOCK_SIZE) {
        authClient.clear();
    }
}

Why am I getting invalid key errors

A invalid key error usually means that the initial key that was used to encrypt the data have become inaccessible. The following is a list of possible causes:

  1. Keys are invalidated by security policies on the device. For example some devices invalidate keys when switching from PIN to Pattern lock. The policy differs by device and OS version.

  2. Keys are inaccessible when application is uninstall but data is backed up. For example when the application is uninstalled but the shared preferences remain. When attempting to sign-in the SDK will attempt to decrypt this data and fail, to resolve the error simply clear the data and try again. This usually happens during development when uninstalling and reinstalling is common.

  3. Keys are lost during application updates. Sometimes keys are inaccessible when updating the application. When this happens it is best to recover by clearing the data. This will require users to sign-in to the appication again.

  4. Encryption bug with the underlying OS. The SDK uses a workaround for a known RSA issue. If the workaround is not working on your device it is best to implement a custom encryption manager and handle the encrytion by using a encryption algorithm that the device supports. For example if using androidx.security.crypto library as the custom encrytion manager, we need to disable encryption then implement the encrypted storage.

EncryptedSharedPreferenceStorage storage = null;
try {
    storage = new EncryptedSharedPreferenceStorage(this);
} catch (GeneralSecurityException | IOException ex) {
    Log.d(TAG, "Unable to initialize EncryptedSharedPreferenceStorage", ex);
}

authClient = new Okta.WebAuthBuilder()
    .withConfig(config)
    .withContext(getApplicationContext())
    .withEncryptionManager(new NoEncryption())
    .withStorage(storage)
    .create();

Advanced techniques

Sometimes as a developer you want to have more control over SDK and here is a couple of advanced API's that are available to give you more control as a developer.

Sign in with a sessionToken (Async)

In order to use authentication flow without browser you can use our AuthClient

AuthClient authClient = new Okta.AuthBuilder()
    .withConfig(config)
    .withContext(getApplicationContext())
    .withStorage(new SharedPreferenceStorage(this))
    .create();

After building AuthClient you should call signIn method where you need provide sessionToken and RequestCallback

authClient.signIn("{sessionToken}", null, new RequestCallback<Result, AuthorizationException>() {
    @Override
    public void onSuccess(@NonNull Result result) {

    }

    @Override
    public void onError(String error, AuthorizationException exception) {

    }
});

Optionally you can provide AuthenticationPayload as a part of sign in call.

Sign in with a sessionToken (Sync)

In order to use a synchronous authentication flow without a browser you can use our SyncAuthClient

SyncAuthClient syncAuthClient = new Okta.SyncAuthBuilder()
    .withConfig(config)
    .withContext(getApplicationContext())
    .withStorage(new SharedPreferenceStorage(this))
    .create();

After building SyncAuthClient you should call signIn method where you need provide sessionToken NOTE: that is a synchronous call so please check that it is not performed on Ui Thread.

syncAuthClient.signIn("sessionToken", null)

Optionally you can provide AuthenticationPayload as a part of sign in call.

Multiple authorization clients

Multiple AuthClient are supported. However for WebAuthClient only one callback can be registered. For example you can have multiple authorization servers redirecting to the same application:

OIDCConfig configFirstApp = new OIDCConfig.Builder()
    .withJsonFile(this, R.id.okta_oidc_config_first)
    .create();

//config file with different domain, client_id than config_first but same redirect_uri
OIDCConfig configSecondApp = new OIDCConfig.Builder()
    .withJsonFile(this, R.id.okta_oidc_config_second)
    .create();

WebAuthClient webAuthFirstApp = new Okta.WebAuthBuilder()
                .withConfig(configFirstApp)
                .withContext(getApplicationContext())
                .withStorage(new SharedPreferenceStorage(this, "FIRSTAPP"))
                .create();
WebAuthClient webAuthSecondApp = new Okta.WebAuthBuilder()
                .withConfig(configSecondApp)
                .withContext(getApplicationContext())
                .withStorage(new SharedPreferenceStorage(this, "SECONDAPP"))
                .create();

if (true) { //provide option to login using different clients.
    webAuthFirstApp.registerCallback(...);
} else {
    webAuthSecondApp.registerCallback(...);
}
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