/*
* Copyright 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.biometric.auth
import android.os.Build
import androidx.annotation.RequiresApi
import androidx.biometric.BiometricPrompt
import androidx.biometric.BiometricPrompt.AuthenticationResult
import androidx.fragment.app.Fragment
import androidx.fragment.app.FragmentActivity
import kotlinx.coroutines.suspendCancellableCoroutine
import java.util.concurrent.Executor
/**
* Shows an authentication prompt to the user.
*
* @param host A wrapper for the component that will host the prompt.
* @param crypto A cryptographic object to be associated with this authentication.
*
* @return [AuthenticationResult] for a successful authentication.
*
* @throws AuthPromptErrorException when an unrecoverable error has been encountered and
* authentication has stopped.
* @throws AuthPromptFailureException when an authentication attempt by the user has been rejected.
*
* @see CredentialAuthPrompt.authenticate(
* AuthPromptHost host,
* BiometricPrompt.CryptoObject,
* AuthPromptCallback
* )
*
* @sample androidx.biometric.samples.auth.credentialAuth
*/
@RequiresApi(Build.VERSION_CODES.R)
public suspend fun CredentialAuthPrompt.authenticate(
host: AuthPromptHost,
crypto: BiometricPrompt.CryptoObject?,
): AuthenticationResult {
return suspendCancellableCoroutine { continuation ->
val authPrompt = startAuthentication(
host,
crypto,
Runnable::run,
CoroutineAuthPromptCallback(continuation)
)
continuation.invokeOnCancellation {
authPrompt.cancelAuthentication()
}
}
}
/**
* Prompts the user to authenticate with the screen lock credential (i.e. PIN, pattern, or password)
* for the device.
*
* @param crypto A cryptographic object to be associated with this authentication.
* @param title The title to be displayed on the prompt.
* @param description An optional description to be displayed on the prompt.
* @param executor An executor for [callback] methods. If `null`, these will run on the main thread.
* @param callback The object that will receive and process authentication events.
* @return An [AuthPrompt] handle to the shown prompt.
*
* @see CredentialAuthPrompt
*/
@RequiresApi(Build.VERSION_CODES.R)
public fun FragmentActivity.startCredentialAuthentication(
crypto: BiometricPrompt.CryptoObject?,
title: CharSequence,
description: CharSequence? = null,
executor: Executor? = null,
callback: AuthPromptCallback
): AuthPrompt {
return startCredentialAuthenticationInternal(
AuthPromptHost(this),
crypto,
title,
description,
executor,
callback
)
}
/**
* Prompts the user to authenticate with the screen lock credential (i.e. PIN, pattern, or password)
* for the device.
*
* @param crypto A cryptographic object to be associated with this authentication.
* @param title The title to be displayed on the prompt.
* @param description An optional description to be displayed on the prompt.
* @return [AuthenticationResult] for a successful authentication.
*
* @throws AuthPromptErrorException when an unrecoverable error has been encountered and
* authentication has stopped.
* @throws AuthPromptFailureException when an authentication attempt by the user has been rejected.
*
* @see CredentialAuthPrompt
*/
@RequiresApi(Build.VERSION_CODES.R)
public suspend fun FragmentActivity.authenticateWithCredentials(
crypto: BiometricPrompt.CryptoObject?,
title: CharSequence,
description: CharSequence? = null
): AuthenticationResult {
val authPrompt = buildCredentialAuthPrompt(title, description)
return authPrompt.authenticate(AuthPromptHost(this), crypto)
}
/**
* Prompts the user to authenticate with the screen lock credential (i.e. PIN, pattern, or password)
* for the device.
*
* @param crypto A cryptographic object to be associated with this authentication.
* @param title The title to be displayed on the prompt.
* @param description An optional description to be displayed on the prompt.
* @param executor An executor for [callback] methods. If `null`, these will run on the main thread.
* @param callback The object that will receive and process authentication events.
* @return An [AuthPrompt] handle to the shown prompt.
*
* @see CredentialAuthPrompt
*/
@RequiresApi(Build.VERSION_CODES.R)
public fun Fragment.startCredentialAuthentication(
crypto: BiometricPrompt.CryptoObject?,
title: CharSequence,
description: CharSequence? = null,
executor: Executor? = null,
callback: AuthPromptCallback
): AuthPrompt {
return startCredentialAuthenticationInternal(
AuthPromptHost(this),
crypto,
title,
description,
executor,
callback
)
}
/**
* Prompts the user to authenticate with the screen lock credential (i.e. PIN, pattern, or password)
* for the device.
*
* @param crypto A cryptographic object to be associated with this authentication.
* @param title The title to be displayed on the prompt.
* @param description An optional description to be displayed on the prompt.
* @return [AuthenticationResult] for a successful authentication.
*
* @throws AuthPromptErrorException when an unrecoverable error has been encountered and
* authentication has stopped.
* @throws AuthPromptFailureException when an authentication attempt by the user has been rejected.
*
* @see CredentialAuthPrompt
*/
@RequiresApi(Build.VERSION_CODES.R)
public suspend fun Fragment.authenticateWithCredentials(
crypto: BiometricPrompt.CryptoObject?,
title: CharSequence,
description: CharSequence? = null
): AuthenticationResult {
val authPrompt = buildCredentialAuthPrompt(title, description)
return authPrompt.authenticate(AuthPromptHost(this), crypto)
}
/**
* Creates a [CredentialAuthPrompt] with the given parameters and starts authentication.
*/
@RequiresApi(Build.VERSION_CODES.R)
private fun startCredentialAuthenticationInternal(
host: AuthPromptHost,
crypto: BiometricPrompt.CryptoObject?,
title: CharSequence,
description: CharSequence?,
executor: Executor?,
callback: AuthPromptCallback
): AuthPrompt {
val prompt = buildCredentialAuthPrompt(title, description)
return if (executor == null) {
prompt.startAuthentication(host, crypto, callback)
} else {
prompt.startAuthentication(host, crypto, executor, callback)
}
}
/**
* Creates a [CredentialAuthPrompt] with the given parameters.
*/
@RequiresApi(Build.VERSION_CODES.R)
private fun buildCredentialAuthPrompt(
title: CharSequence,
description: CharSequence?
): CredentialAuthPrompt = CredentialAuthPrompt.Builder(title)
.apply { description?.let { setDescription(it) } }
.build()