106 lines
3.2 KiB
C#
106 lines
3.2 KiB
C#
using System.Security.Cryptography;
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using System.Text;
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using BTCPayServer.Lightning;
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using LNURL;
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using Microsoft.AspNetCore.Cors;
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using Microsoft.AspNetCore.Mvc;
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using Newtonsoft.Json;
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using Nostr.Client.Json;
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using Nostr.Client.Messages;
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using Nostr.Client.Utils;
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using NostrStreamer.Database;
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using NostrStreamer.Services;
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namespace NostrStreamer.Controllers;
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[Route("/api/pay")]
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[EnableCors]
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public class LnurlController : Controller
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{
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private readonly Config _config;
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private readonly UserService _userService;
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public LnurlController(Config config, UserService userService)
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{
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_config = config;
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_userService = userService;
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}
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[HttpGet("/.well-known/lnurlp/{key}")]
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public async Task<IActionResult> GetPayService([FromRoute] string key)
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{
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var user = await _userService.GetUser(key);
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if (user == default) return LnurlError("User not found");
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var metadata = GetMetadata(user);
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var pubKey = _config.GetPubKey();
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return Json(new LNURLPayRequest
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{
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Callback = new Uri(_config.ApiHost, $"/api/pay/{key}"),
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Metadata = JsonConvert.SerializeObject(metadata),
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MinSendable = LightMoney.Satoshis(1),
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MaxSendable = LightMoney.Coins(1),
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Tag = "payRequest",
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NostrPubkey = pubKey,
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AllowsNostr = true,
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});
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}
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[HttpGet("{key}")]
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public async Task<IActionResult> PayUserBalance([FromRoute] string key, [FromQuery] ulong amount,
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[FromQuery] string? nostr)
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{
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try
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{
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var user = await _userService.GetUser(key);
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if (user == default) return LnurlError("User not found");
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string? descHash;
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if (!string.IsNullOrEmpty(nostr))
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{
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var ev = JsonConvert.DeserializeObject<NostrEvent>(nostr, NostrSerializer.Settings);
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var amountTag = ev?.Tags?.FindFirstTagValue("amount");
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if (ev?.Kind != NostrKind.ZapRequest ||
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(amountTag != default && amountTag != amount.ToString()) ||
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!ev.IsSignatureValid())
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{
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throw new Exception("Invalid nostr event");
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}
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descHash = SHA256.HashData(Encoding.UTF8.GetBytes(nostr)).ToHex();
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}
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else
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{
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var metadata = GetMetadata(user);
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descHash = SHA256.HashData(Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(metadata))).ToHex();
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}
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var invoice = await _userService.CreateTopup(key, amount, descHash, nostr);
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return Json(new LNURLPayRequest.LNURLPayRequestCallbackResponse
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{
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Pr = invoice
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});
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}
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catch (Exception ex)
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{
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return LnurlError($"Failed to create invoice (${ex.Message})");
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}
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}
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private List<KeyValuePair<string, string>> GetMetadata(User u)
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{
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return new List<KeyValuePair<string, string>>()
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{
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new("text/plain", $"Topup for {u.PubKey}")
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};
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}
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private IActionResult LnurlError(string reason)
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{
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return Json(new LNUrlStatusResponse()
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{
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Reason = reason,
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Status = "ERROR"
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});
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}
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} |