diff options
Diffstat (limited to 'cashier/src/main/java/net/taler/cashier/withdraw/NfcManager.kt')
| -rw-r--r-- | cashier/src/main/java/net/taler/cashier/withdraw/NfcManager.kt | 234 |
1 files changed, 0 insertions, 234 deletions
diff --git a/cashier/src/main/java/net/taler/cashier/withdraw/NfcManager.kt b/cashier/src/main/java/net/taler/cashier/withdraw/NfcManager.kt deleted file mode 100644 index a487b5f..0000000 --- a/cashier/src/main/java/net/taler/cashier/withdraw/NfcManager.kt +++ /dev/null @@ -1,234 +0,0 @@ -/* - * This file is part of GNU Taler - * (C) 2020 Taler Systems S.A. - * - * GNU Taler is free software; you can redistribute it and/or modify it under the - * terms of the GNU General Public License as published by the Free Software - * Foundation; either version 3, or (at your option) any later version. - * - * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY - * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR - * A PARTICULAR PURPOSE. See the GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License along with - * GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/> - */ - -package net.taler.cashier.withdraw - -import android.app.Activity -import android.content.Context -import android.nfc.NfcAdapter -import android.nfc.NfcAdapter.FLAG_READER_NFC_A -import android.nfc.NfcAdapter.FLAG_READER_SKIP_NDEF_CHECK -import android.nfc.NfcAdapter.getDefaultAdapter -import android.nfc.Tag -import android.nfc.tech.IsoDep -import android.util.Log -import net.taler.cashier.Utils.hexStringToByteArray -import org.json.JSONObject -import java.io.ByteArrayOutputStream -import java.net.URL -import javax.net.ssl.HttpsURLConnection - -@Suppress("unused") -private const val TALER_AID = "A0000002471001" - -class NfcManager : NfcAdapter.ReaderCallback { - - companion object { - const val TAG = "taler-merchant" - - /** - * Returns true if NFC is supported and false otherwise. - */ - fun hasNfc(context: Context): Boolean { - return getNfcAdapter(context) != null - } - - /** - * Enables NFC reader mode. Don't forget to call [stop] afterwards. - */ - fun start(activity: Activity, nfcManager: NfcManager) { - getNfcAdapter(activity)?.enableReaderMode(activity, nfcManager, nfcManager.flags, null) - } - - /** - * Disables NFC reader mode. Call after [start]. - */ - fun stop(activity: Activity) { - getNfcAdapter(activity)?.disableReaderMode(activity) - } - - private fun getNfcAdapter(context: Context): NfcAdapter? { - return getDefaultAdapter(context) - } - } - - private val flags = FLAG_READER_NFC_A or FLAG_READER_SKIP_NDEF_CHECK - - private var tagString: String? = null - private var currentTag: IsoDep? = null - - fun setTagString(tagString: String) { - this.tagString = tagString - } - - override fun onTagDiscovered(tag: Tag?) { - - Log.v(TAG, "tag discovered") - - val isoDep = IsoDep.get(tag) - isoDep.connect() - - currentTag = isoDep - - isoDep.transceive(apduSelectFile()) - - val tagString: String? = tagString - if (tagString != null) { - isoDep.transceive(apduPutTalerData(1, tagString.toByteArray())) - } - - // FIXME: use better pattern for sleeps in between requests - // -> start with fast polling, poll more slowly if no requests are coming - - while (true) { - try { - val reqFrame = isoDep.transceive(apduGetData()) - if (reqFrame.size < 2) { - Log.v(TAG, "request frame too small") - break - } - val req = ByteArray(reqFrame.size - 2) - if (req.isEmpty()) { - continue - } - reqFrame.copyInto(req, 0, 0, reqFrame.size - 2) - val jsonReq = JSONObject(req.toString(Charsets.UTF_8)) - val reqId = jsonReq.getInt("id") - Log.v(TAG, "got request $jsonReq") - val jsonInnerReq = jsonReq.getJSONObject("request") - val method = jsonInnerReq.getString("method") - val urlStr = jsonInnerReq.getString("url") - Log.v(TAG, "url '$urlStr'") - Log.v(TAG, "method '$method'") - val url = URL(urlStr) - val conn: HttpsURLConnection = url.openConnection() as HttpsURLConnection - conn.setRequestProperty("Accept", "application/json") - conn.connectTimeout = 5000 - conn.doInput = true - when (method) { - "get" -> { - conn.requestMethod = "GET" - } - "postJson" -> { - conn.requestMethod = "POST" - conn.doOutput = true - conn.setRequestProperty("Content-Type", "application/json; utf-8") - val body = jsonInnerReq.getString("body") - conn.outputStream.write(body.toByteArray(Charsets.UTF_8)) - } - else -> { - throw Exception("method not supported") - } - } - Log.v(TAG, "connecting") - conn.connect() - Log.v(TAG, "connected") - - val statusCode = conn.responseCode - val tunnelResp = JSONObject() - tunnelResp.put("id", reqId) - tunnelResp.put("status", conn.responseCode) - - if (statusCode == 200) { - val stream = conn.inputStream - val httpResp = stream.buffered().readBytes() - tunnelResp.put("responseJson", JSONObject(httpResp.toString(Charsets.UTF_8))) - } - - Log.v(TAG, "sending: $tunnelResp") - - isoDep.transceive(apduPutTalerData(2, tunnelResp.toString().toByteArray())) - } catch (e: Exception) { - Log.v(TAG, "exception during NFC loop: $e") - break - } - } - - isoDep.close() - } - - private fun writeApduLength(stream: ByteArrayOutputStream, size: Int) { - when { - size == 0 -> { - // No size field needed! - } - size <= 255 -> // One byte size field - stream.write(size) - size <= 65535 -> { - stream.write(0) - // FIXME: is this supposed to be little or big endian? - stream.write(size and 0xFF) - stream.write((size ushr 8) and 0xFF) - } - else -> throw Error("payload too big") - } - } - - private fun apduSelectFile(): ByteArray { - return hexStringToByteArray("00A4040007A0000002471001") - } - - private fun apduPutData(payload: ByteArray): ByteArray { - val stream = ByteArrayOutputStream() - - // Class - stream.write(0x00) - - // Instruction 0xDA = put data - stream.write(0xDA) - - // Instruction parameters - // (proprietary encoding) - stream.write(0x01) - stream.write(0x00) - - writeApduLength(stream, payload.size) - - stream.write(payload) - - return stream.toByteArray() - } - - private fun apduPutTalerData(talerInst: Int, payload: ByteArray): ByteArray { - val realPayload = ByteArrayOutputStream() - realPayload.write(talerInst) - realPayload.write(payload) - return apduPutData(realPayload.toByteArray()) - } - - private fun apduGetData(): ByteArray { - val stream = ByteArrayOutputStream() - - // Class - stream.write(0x00) - - // Instruction 0xCA = get data - stream.write(0xCA) - - // Instruction parameters - // (proprietary encoding) - stream.write(0x01) - stream.write(0x00) - - // Max expected response size, two - // zero bytes denotes 65536 - stream.write(0x0) - stream.write(0x0) - - return stream.toByteArray() - } - -} |