Add single tap snippets

Author: Neelansh Sahai

identity/credentialmanager/src/main/java/com/example/identity/credentialmanager/SingleTap.kt

@@ -0,0 +1,195 @@
+package com.example.identity.credentialmanager
+
+import android.os.Build.VERSION_CODES
+import android.util.Log
+import androidx.activity.ComponentActivity
+import androidx.annotation.RequiresApi
+import androidx.credentials.CreatePublicKeyCredentialRequest
+import androidx.credentials.provider.BeginCreatePublicKeyCredentialRequest
+import androidx.credentials.provider.BeginGetPublicKeyCredentialOption
+import androidx.credentials.provider.BiometricPromptData
+import androidx.credentials.provider.CallingAppInfo
+import androidx.credentials.provider.PendingIntentHandler
+
+class SingleTap: ComponentActivity() {
+    private val x: Any? = null
+    private val TAG: String = ""
+
+    private fun passkeyCreation(
+        request: BeginCreatePublicKeyCredentialRequest,
+        passwordCount: Int,
+        passkeyCount: Int
+    ) {
+        val option = null
+        val origin = null
+        val responseBuilder = null
+        val autoSelectEnabled = null
+        val allowedAuthenticator = 0
+
+        val y =
+            // [START android_identity_single_tap_set_biometric_prompt_data]
+            PublicKeyCredentialEntry(
+                // other properties...
+
+                biometricPromptData = BiometricPromptData(
+                    allowedAuthenticators = allowedAuthenticator
+                )
+            )
+            // [END android_identity_single_tap_set_biometric_prompt_data]
+
+        when (x) {
+            // [START android_identity_single_tap_pk_creation]
+            is BeginCreatePublicKeyCredentialRequest -> {
+                Log.i(TAG, "Request is passkey type")
+                return handleCreatePasskeyQuery(request, passwordCount, passkeyCount)
+            }
+            // [END android_identity_single_tap_pk_creation]
+            
+            // [START android_identity_single_tap_pk_flow]
+            is BeginGetPublicKeyCredentialOption -> {
+                // ... other logic
+
+                populatePasskeyData(
+                    origin,
+                    option,
+                    responseBuilder,
+                    autoSelectEnabled,
+                    allowedAuthenticator
+                )
+
+                // ... other logic as needed
+            }
+            // [END android_identity_single_tap_pk_flow]
+        }
+    }
+
+    private fun handleCreatePasskeyQuery(
+        request: BeginCreatePublicKeyCredentialRequest,
+        passwordCount: Int,
+        passkeyCount: Int
+    ) {
+        val allowedAuthenticator = 0
+
+        // [START android_identity_single_tap_create_entry]
+        val createEntry = CreateEntry(
+            // Additional properties...
+            biometricPromptData = BiometricPromptData(
+                allowedAuthenticators = allowedAuthenticator
+            ),
+        )
+        // [END android_identity_single_tap_create_entry]
+    }
+
+    @RequiresApi(VERSION_CODES.M)
+    private fun handleCredentialEntrySelection(
+        accountId: String = "",
+        createPasskey: (String, CallingAppInfo, ByteArray?, String) -> Unit
+    ) {
+        // [START android_identity_single_tap_handle_credential_entry]
+        val createRequest = PendingIntentHandler.retrieveProviderCreateCredentialRequest(intent)
+        if (createRequest == null) {
+            Log.i(TAG, "request is null")
+            setUpFailureResponseAndFinish("Unable to extract request from intent")
+            return
+        }
+        // Other logic...
+
+        val biometricPromptResult = createRequest.biometricPromptResult
+
+        // Add your logic based on what needs to be done
+        // after getting biometrics
+
+        if (createRequest.callingRequest is CreatePublicKeyCredentialRequest) {
+            val publicKeyRequest: CreatePublicKeyCredentialRequest =
+                createRequest.callingRequest as CreatePublicKeyCredentialRequest
+
+            if (biometricPromptResult == null) {
+                // Do your own authentication flow, if needed
+            }
+            else if (biometricPromptResult.isSuccessful) {
+                createPasskey(
+                    publicKeyRequest.requestJson,
+                    createRequest.callingAppInfo,
+                    publicKeyRequest.clientDataHash,
+                    accountId
+                )
+            } else {
+                val error = biometricPromptResult.authenticationError
+                // Process the error
+            }
+
+            // Other logic...
+        }
+        // [END android_identity_single_tap_handle_credential_entry]
+    }
+
+    @RequiresApi(VERSION_CODES.M)
+    private fun retrieveProviderGetCredentialRequest(
+        validatePasskey: (String, String, String, String, String, String, String) -> Unit,
+        publicKeyRequest: CreatePublicKeyCredentialRequest,
+        origin: String,
+        uid: String,
+        passkey: PK,
+        credId: String,
+        privateKey: String,
+    ) {
+        // [START android_identity_single_tap_get_cred_request]
+        val getRequest =
+            PendingIntentHandler.retrieveProviderGetCredentialRequest(intent)
+
+        if (getRequest == null) {
+            Log.i(TAG, "request is null")
+            setUpFailureResponseAndFinish("Unable to extract request from intent")
+            return
+        }
+
+        // Other logic...
+
+        val biometricPromptResult = getRequest.biometricPromptResult
+
+        // Add your logic based on what needs to be done
+        // after getting biometrics
+
+        if (biometricPromptResult == null)
+        {
+            // Do your own authentication flow, if necessary
+        } else if (biometricPromptResult.isSuccessful) {
+
+            Log.i(TAG, "The response from the biometricPromptResult was ${biometricPromptResult.authenticationResult?.authenticationType}")
+
+            validatePasskey(
+                publicKeyRequest.requestJson,
+                origin,
+                packageName,
+                uid,
+                passkey.username,
+                credId,
+                privateKey
+            )
+        } else {
+            val error = biometricPromptResult.authenticationError
+            // Process the error
+        }
+
+        // Other logic...
+        // [END android_identity_single_tap_get_cred_request]
+    }
+
+    private fun CreateEntry(biometricPromptData: BiometricPromptData) {}
+
+    private fun PublicKeyCredentialEntry(biometricPromptData: BiometricPromptData) {}
+
+    private fun populatePasskeyData(
+        origin: Any?,
+        option: Any?,
+        responseBuilder: Any?,
+        autoSelectEnabled: Any?,
+        allowedAuthenticator: Any?
+    ) {}
+
+    private fun setUpFailureResponseAndFinish(str: String) {}
+}
+
+data class PK(
+    val username: String,
+)