-
Notifications
You must be signed in to change notification settings - Fork 88
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Adding PresentationActivity to wallet, which will appear on-screen with related presentation UI once the NfcEngagementHandler starts the activity. This addition allows for in-person presentation with NFC engagement. Tested manually with 0/1/2 active credentials in wallet. Signed-off-by: Suzanna Jiwani <[email protected]>
- Loading branch information
1 parent
afab57f
commit 4a1cf1c
Showing
9 changed files
with
714 additions
and
81 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
147 changes: 147 additions & 0 deletions
147
wallet/src/main/java/com/android/identity_credential/wallet/NfcEngagementHandler.kt
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| /* | ||
| * Copyright (C) 2024 Google LLC | ||
| * | ||
| * 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 com.android.identity_credential.wallet | ||
|
|
||
| import android.content.Context | ||
| import android.content.Intent | ||
| import android.nfc.cardemulation.HostApduService | ||
| import android.os.Bundle | ||
| import android.os.Handler | ||
| import android.os.Looper | ||
| import android.os.Vibrator | ||
| import androidx.core.content.ContextCompat | ||
| import com.android.identity.android.mdoc.engagement.NfcEngagementHelper | ||
| import com.android.identity.android.mdoc.transport.DataTransport | ||
| import com.android.identity.android.mdoc.transport.DataTransportOptions | ||
| import com.android.identity.internal.Util | ||
| import com.android.identity.securearea.SecureArea | ||
| import com.android.identity.util.Logger | ||
|
|
||
| class NfcEngagementHandler : HostApduService() { | ||
| companion object { | ||
| private val TAG = "NfcEngagementHandler" | ||
| } | ||
|
|
||
| private var engagementHelper: NfcEngagementHelper? = null | ||
|
|
||
| private val eDeviceKeyCurve = SecureArea.EC_CURVE_P256 | ||
| private val eDeviceKeyPair by lazy { | ||
| Util.createEphemeralKeyPair(eDeviceKeyCurve) | ||
| } | ||
| private val nfcEngagementListener = object : NfcEngagementHelper.Listener { | ||
|
|
||
| override fun onTwoWayEngagementDetected() { | ||
| Logger.i(TAG, "onTwoWayEngagementDetected") | ||
| } | ||
|
|
||
| override fun onHandoverSelectMessageSent() { | ||
| Logger.i(TAG, "onHandoverSelectMessageSent") | ||
| // This is invoked _just_ before the NFC tag reader will do a READ_BINARY | ||
| // for the Handover Select message. Vibrate the device to indicate to the | ||
| // user they can start removing the device from the reader. | ||
| val vibrator = getSystemService(Context.VIBRATOR_SERVICE) as Vibrator | ||
| val vibrationPattern = longArrayOf(0, 500, 50, 300) | ||
| val indexInPatternToRepeat = -1 | ||
| vibrator.vibrate(vibrationPattern, indexInPatternToRepeat) | ||
| PresentationActivity.setState(PresentationActivity.State.ENGAGEMENT_SENT) | ||
| } | ||
|
|
||
| override fun onDeviceConnecting() { | ||
| Logger.i(TAG, "onDeviceConnecting") | ||
| } | ||
|
|
||
| override fun onDeviceConnected(transport: DataTransport) { | ||
| Logger.i(TAG, "onDeviceConnected") | ||
|
|
||
| if (!PresentationActivity.setEngagementInfo(transport, engagementHelper!!.handover, | ||
| eDeviceKeyCurve, eDeviceKeyPair, engagementHelper!!.deviceEngagement)) { | ||
| Logger.i(TAG, "Presentation already in progress") | ||
| } else { | ||
| PresentationActivity.setState(PresentationActivity.State.CONNECTED) | ||
| } | ||
|
|
||
| engagementHelper?.close() | ||
| engagementHelper = null | ||
| } | ||
|
|
||
| override fun onError(error: Throwable) { | ||
| Logger.i(TAG, "Engagement Listener: onError -> ${error.message}") | ||
| engagementHelper?.close() | ||
| engagementHelper = null | ||
| } | ||
| } | ||
|
|
||
| override fun onCreate() { | ||
| super.onCreate() | ||
| Logger.i(TAG, "onCreate") | ||
|
|
||
| val application: WalletApplication = application as WalletApplication | ||
|
|
||
| if (application.credentialStore.listCredentials().size > 0 | ||
| && !PresentationActivity.isPresentationActive()) { | ||
|
|
||
| PresentationActivity.setState(PresentationActivity.State.ENGAGING) | ||
|
|
||
| val options = DataTransportOptions.Builder().build() | ||
| val builder = NfcEngagementHelper.Builder( | ||
| applicationContext, | ||
| eDeviceKeyPair.public, | ||
| eDeviceKeyCurve, | ||
| options, | ||
| nfcEngagementListener, | ||
| ContextCompat.getMainExecutor(applicationContext) | ||
| ) | ||
| builder.useNegotiatedHandover() | ||
| engagementHelper = builder.build() | ||
|
|
||
| val launchAppIntent = Intent(applicationContext, PresentationActivity::class.java) | ||
| launchAppIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK or | ||
| Intent.FLAG_ACTIVITY_NO_HISTORY or | ||
| Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS) | ||
| applicationContext.startActivity(launchAppIntent) | ||
| } | ||
| } | ||
|
|
||
| override fun processCommandApdu(commandApdu: ByteArray, extras: Bundle?): ByteArray? { | ||
| Logger.dHex(TAG, "processCommandApdu", commandApdu) | ||
| return engagementHelper?.nfcProcessCommandApdu(commandApdu) | ||
| } | ||
|
|
||
| override fun onDeactivated(reason: Int) { | ||
| Logger.i(TAG, "onDeactivated: reason-> $reason ") | ||
| engagementHelper?.nfcOnDeactivated(reason) | ||
|
|
||
| // We need to close the NfcEngagementHelper but if we're doing it as the reader moves | ||
| // out of the field, it's too soon as it may take a couple of seconds to establish | ||
| // the connection, triggering onDeviceConnected() callback above. | ||
| // | ||
| // In fact, the reader _could_ actually take a while to establish the connection... | ||
| // for example the UI in the mdoc doc reader might have the operator pick the | ||
| // transport if more than one is offered. In fact this is exactly what we do in | ||
| // our mdoc reader. | ||
| // | ||
| // So we give the reader 15 seconds to do this... | ||
| // | ||
| val timeoutSeconds = 15 | ||
| Handler(Looper.getMainLooper()).postDelayed({ | ||
| if (engagementHelper != null) { | ||
| Logger.w(TAG, "Reader didn't connect inside $timeoutSeconds seconds, closing") | ||
| engagementHelper!!.close() | ||
| } | ||
| }, timeoutSeconds * 1000L) | ||
| } | ||
| } |
Oops, something went wrong.