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package net.taler.wallet
import android.content.*
import android.net.Uri
import android.nfc.cardemulation.HostApduService
import android.os.Bundle
import android.util.Log
import java.io.ByteArrayInputStream
import java.io.ByteArrayOutputStream
import java.net.URI
import java.util.concurrent.ConcurrentLinkedDeque
fun makeApduSuccessResponse(payload: ByteArray): ByteArray {
val stream = ByteArrayOutputStream()
stream.write(payload)
stream.write(0x90)
stream.write(0x00)
return stream.toByteArray()
}
fun makeApduFailureResponse(): ByteArray {
val stream = ByteArrayOutputStream()
stream.write(0x6F)
stream.write(0x00)
return stream.toByteArray()
}
fun readApduBodySize(stream: ByteArrayInputStream): Int {
val b0 = stream.read()
if (b0 == -1) {
return 0;
}
if (b0 != 0) {
return b0
}
val b1 = stream.read()
val b2 = stream.read()
return (b1 shl 8) and b2
}
class HostCardEmulatorService: HostApduService() {
val queuedRequests: ConcurrentLinkedDeque<String> = ConcurrentLinkedDeque()
lateinit var receiver: BroadcastReceiver
override fun onCreate() {
super.onCreate()
receiver = object : BroadcastReceiver() {
override fun onReceive(p0: Context?, p1: Intent?) {
queuedRequests.addLast(p1!!.getStringExtra("tunnelMessage"))
}
}
IntentFilter(HTTP_TUNNEL_REQUEST).also { filter ->
registerReceiver(receiver, filter)
}
}
override fun onDestroy() {
super.onDestroy()
unregisterReceiver(receiver)
}
override fun onDeactivated(reason: Int) {
Log.d(TAG, "Deactivated: $reason")
Intent().also { intent ->
intent.action = MERCHANT_NFC_DISCONNECTED
sendBroadcast(intent)
}
}
override fun processCommandApdu(commandApdu: ByteArray?,
extras: Bundle?): ByteArray {
Log.d(TAG, "Processing command APDU")
if (commandApdu == null) {
Log.d(TAG, "APDU is null")
return makeApduFailureResponse()
}
val stream = ByteArrayInputStream(commandApdu)
val command = stream.read()
if (command != 0) {
Log.d(TAG, "APDU has invalid command")
return makeApduFailureResponse()
}
val instruction = stream.read()
// Read instruction parameters, currently ignored.
stream.read()
stream.read()
if (instruction == SELECT_INS) {
// FIXME: validate body!
return makeApduSuccessResponse(ByteArray(0))
}
if (instruction == GET_INS) {
val req = queuedRequests.poll()
return if (req != null) {
Log.v(TAG,"sending tunnel request")
makeApduSuccessResponse(req.toByteArray(Charsets.UTF_8))
} else {
makeApduSuccessResponse(ByteArray(0))
}
}
if (instruction == PUT_INS) {
val bodySize = readApduBodySize(stream)
val talerInstr = stream.read()
val bodyBytes = stream.readBytes()
if (1 + bodyBytes.size != bodySize) {
Log.w(TAG, "mismatched body size ($bodySize vs ${bodyBytes.size}")
}
when (talerInstr) {
1 -> {
val url = String(bodyBytes, Charsets.UTF_8)
Log.v(TAG, "got URL: '$url'")
Intent(this, MainActivity::class.java).also { intent ->
intent.data = Uri.parse(url)
intent.action = Intent.ACTION_VIEW
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
startActivity(intent)
}
}
2 -> {
Log.v(TAG, "got http response: ${bodyBytes.toString(Charsets.UTF_8)}")
Intent().also { intent ->
intent.action = HTTP_TUNNEL_RESPONSE
intent.putExtra("response", bodyBytes.toString(Charsets.UTF_8))
sendBroadcast(intent)
}
}
else -> {
Log.v(TAG, "taler instruction $talerInstr unknown")
}
}
return makeApduSuccessResponse(ByteArray(0))
}
return makeApduFailureResponse()
}
companion object {
const val TAG = "taler-wallet-hce"
const val SELECT_INS = 0xA4
const val PUT_INS = 0xDA
const val GET_INS = 0xCA
const val TRIGGER_PAYMENT_ACTION = "net.taler.TRIGGER_PAYMENT_ACTION"
const val MERCHANT_NFC_CONNECTED = "net.taler.MERCHANT_NFC_CONNECTED"
const val MERCHANT_NFC_DISCONNECTED = "net.taler.MERCHANT_NFC_DISCONNECTED"
const val HTTP_TUNNEL_RESPONSE = "net.taler.HTTP_TUNNEL_RESPONSE"
const val HTTP_TUNNEL_REQUEST = "net.taler.HTTP_TUNNEL_REQUEST"
}
}
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