195 lines
7.4 KiB
C#
195 lines
7.4 KiB
C#
using System.CommandLine;
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using PCSC;
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using PCSC.Monitoring;
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using PCSC.Iso7816;
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const int defaultAmount = 150;
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var rootCommand = new RootCommand("Fancy Test Machine for AfRApay");
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var listReadersOption = new Option<bool>("--list-readers", "List card readers and exit");
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rootCommand.Add(listReadersOption);
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var webAddrOption = new Option<Uri>("--web-addr", "Base URL for AfRApay.Web");
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webAddrOption.SetDefaultValue(new Uri("http://127.0.0.1:5296"));
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rootCommand.Add(webAddrOption);
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rootCommand.SetHandler((listReaders, webAddr) => {
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using var context = ContextFactory.Instance.Establish(SCardScope.System);
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// Ignore Yubikeys.
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var readerNames = context.GetReaders()
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.Where((readerName) => !readerName.Contains("Yubico"))
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.ToArray();
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// We need at least one card reader or this won't work!
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if (readerNames.Length == 0) {
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Console.Error.WriteLine("Error: no card reader detected");
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Environment.Exit(1);
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}
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// If --list-readers is passed, list readers and exit.
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if (listReaders) {
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Console.Error.WriteLine("----------- Connected Readers ----------");
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foreach (var name in readerNames) {
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Console.WriteLine(name);
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}
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Console.Error.WriteLine("----------------------------------------");
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Environment.Exit(0);
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}
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// Setup!
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using HttpClient httpClient = new();
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httpClient.BaseAddress = webAddr;
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var state = TerminalState.Debit;
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decimal amount = defaultAmount;
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Console.Error.WriteLine("----------------------------------------");
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Console.Error.WriteLine("--- AfRApay FTM - Fancy Test Machine ---");
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Console.Error.WriteLine("----------------------------------------");
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Console.Error.WriteLine();
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Console.Error.WriteLine("AfRApay.Web: {0}", httpClient.BaseAddress);
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Console.Error.WriteLine();
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Console.Error.WriteLine("Hotkeys (case insensitive):");
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Console.Error.WriteLine(" [-] Debit (default)");
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Console.Error.WriteLine(" [+] Credit");
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Console.Error.WriteLine(" [=] Set amount (default: €{0:C})", amount/100M);
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Console.Error.WriteLine();
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Console.Error.WriteLine(" [B] Balance query");
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Console.Error.WriteLine(" [L] Link card (initiate from web UI)");
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Console.Error.WriteLine(" [Esc] Cancel, reset state and amount");
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Console.Error.WriteLine();
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Console.Error.WriteLine("----------------------------------------");
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// Listen for events on all connected readers.
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using var monitor = MonitorFactory.Instance.Create(SCardScope.System);
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monitor.Initialized += (_, args) => Console.WriteLine("[ Reader Initialized: {0} ]", args.ReaderName);
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monitor.MonitorException += (_, args) => {
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Console.Error.WriteLine("! ERROR: {0}", args);
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Environment.Exit(1);
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};
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monitor.StatusChanged += (_, args) => Console.WriteLine("~ {0} -> {1}", args.LastState, args.NewState);
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monitor.CardInserted += (_, args) => {
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Console.WriteLine("> TAP: {0}", Convert.ToHexString(args.Atr));
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var reader = new IsoReader(context, args.ReaderName, SCardShareMode.Shared, SCardProtocol.Any);
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HandleTap(reader, httpClient, state, amount);
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};
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monitor.CardRemoved += (_, _) => {
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Console.WriteLine("< OFF");
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Console.WriteLine(); // Write a blank line between card taps for readability.
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};
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Console.WriteLine("[ Starting... ]");
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monitor.Start(readerNames);
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// Handle hotkeys.
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while (true) {
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var key = Console.ReadKey();
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var dontPrint = false;
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switch (key.Key) {
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case ConsoleKey.Subtract:
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case ConsoleKey.OemMinus:
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state = TerminalState.Debit;
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break;
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case ConsoleKey.Add:
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case ConsoleKey.OemPlus:
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state = TerminalState.Credit;
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break;
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case 0 when key.KeyChar == '=':
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Console.Error.Write("\b => ENTER AMOUNT: ");
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amount = Math.Abs(int.Parse(Console.ReadLine() ?? "150".Trim()));
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break;
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case ConsoleKey.L:
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state = TerminalState.Link;
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break;
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case ConsoleKey.B:
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state = TerminalState.Balance;
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break;
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case ConsoleKey.Escape:
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state = TerminalState.Debit;
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amount = defaultAmount;
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break;
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default:
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Console.Error.Write("\b");
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dontPrint = true;
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break;
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}
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if (dontPrint) {
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// Invalid input, just ignore it.
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} else if (state is TerminalState.Debit or TerminalState.Credit) {
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Console.Error.WriteLine("\b => {0}: €{1}", state, amount);
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} else {
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Console.Error.WriteLine("\b => {0}", state);
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}
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}
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// ReSharper disable once FunctionNeverReturns
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}, listReadersOption, webAddrOption);
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return await rootCommand.InvokeAsync(args);
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// Queries a card for data when one is tapped.
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static async void HandleTap(IIsoReader reader, HttpClient httpClient, TerminalState state, decimal amount) {
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// Send a PCSC pseudo-APDU to query the ISO 14443 UID.
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var uidRsp = reader.Transmit(new CommandApdu(IsoCase.Case2Short, SCardProtocol.Any) {
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CLA = 0xFF,
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Instruction = InstructionCode.GetData,
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P1 = 0x00,
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P2 = 0x00,
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});
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if (!IsSucc(uidRsp)) {
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Console.Error.WriteLine("--> Card Error: SW1={0} SW2={1}", (SW1Code)uidRsp.SW1, uidRsp.SW2);
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return;
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}
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var uid = uidRsp.GetData();
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Console.WriteLine(" UID: {0}", Convert.ToHexString(uid));
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// Query the backend, which endpoint depending on terminal state.
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switch (state) {
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case TerminalState.Debit:
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case TerminalState.Credit:
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var finalAmount = Math.Abs(amount) * (state == TerminalState.Debit ? -1 : 1);
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var idempotencyKey = new byte[18];
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Random.Shared.NextBytes(idempotencyKey);
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var ik = Convert.ToHexString(idempotencyKey);
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await CallPut(httpClient, $"/api/card/{Convert.ToHexString(uid)}/transaction/{ik}?amount={finalAmount}");
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break;
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case TerminalState.Link:
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await CallGet(httpClient, $"/api/card/{Convert.ToHexString(uid)}/link");
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break;
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case TerminalState.Balance:
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await CallGet(httpClient, $"/api/card/{Convert.ToHexString(uid)}/balance");
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break;
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default:
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Console.Error.WriteLine("UNKNOWN TERMINAL STATE: {0}", state);
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break;
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}
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}
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// Was the command successful?
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static bool IsSucc(Response rsp) {
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return rsp is { SW1: (byte)SW1Code.Normal, SW2: 0x00 };
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}
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static async Task<string> CallGet(HttpClient client, string path) {
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Console.WriteLine(" -> GET {0}", path);
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var rsp = await client.GetStringAsync(path);
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Console.WriteLine(" <- {0}", rsp);
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return rsp;
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}
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static async Task<string> CallPut(HttpClient client, string path) {
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Console.WriteLine(" -> PUT {0}", path);
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var rsp = await client.PutAsync(path, new StringContent("")).Result.Content.ReadAsStringAsync();
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Console.WriteLine(" <- {0}", rsp);
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return rsp;
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}
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// Terminal State.
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internal enum TerminalState {
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Debit,
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Credit,
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Link,
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Balance,
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};
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