| 1 | import 'dart:async'; |
| 2 | import 'dart:io'; |
| 3 | import 'dart:isolate'; |
| 4 | |
| 5 | import 'package:cw_bitcoin/payjoin/manager.dart'; |
| 6 | import 'package:cw_bitcoin/payjoin/payjoin_session_errors.dart'; |
| 7 | import 'package:cw_core/utils/print_verbose.dart'; |
| 8 | import 'package:cw_core/utils/proxy_wrapper.dart'; |
| 9 | import 'package:cw_core/utils/tor/abstract.dart'; |
| 10 | import 'package:payjoin_flutter/common.dart'; |
| 11 | import 'package:payjoin_flutter/send.dart'; |
| 12 | import 'package:payjoin_flutter/src/generated/frb_generated.dart' as pj; |
| 13 | import 'package:payjoin_flutter/src/generated/api/send/error.dart' as pj_error; |
| 14 | import 'package:payjoin_flutter/uri.dart' as pj_uri; |
| 15 | |
| 16 | enum PayjoinSenderRequestTypes { |
| 17 | requestPosted, |
| 18 | psbtToSign; |
| 19 | } |
| 20 | |
| 21 | class PayjoinSenderWorker { |
| 22 | final SendPort sendPort; |
| 23 | final pendingRequests = <String, Completer<dynamic>>{}; |
| 24 | final String pjUrl; |
| 25 | |
| 26 | PayjoinSenderWorker._(this.sendPort, this.pjUrl); |
| 27 | |
| 28 | static Future<void> run(List<Object> args) async { |
| 29 | await pj.core.init(); |
| 30 | CakeTor.instance = await CakeTorInstance.getInstance(); |
| 31 | |
| 32 | final sendPort = args[0] as SendPort; |
| 33 | final senderJson = args[1] as String; |
| 34 | final pjUrl = args[2] as String; |
| 35 | |
| 36 | final sender = Sender.fromJson(json: senderJson); |
| 37 | final worker = PayjoinSenderWorker._(sendPort, pjUrl); |
| 38 | |
| 39 | try { |
| 40 | final proposalPsbt = await worker.runSender(sender); |
| 41 | sendPort.send({ |
| 42 | 'type': PayjoinSenderRequestTypes.psbtToSign, |
| 43 | 'psbt': proposalPsbt, |
| 44 | }); |
| 45 | } catch (e) { |
| 46 | sendPort.send(e); |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | final client = ProxyWrapper().getHttpIOClient(); |
| 51 | |
| 52 | /// Run a payjoin sender (V2 protocol first, fallback to V1). |
| 53 | Future<String> runSender(Sender sender) async { |
| 54 | try { |
| 55 | return await _runSenderV2(sender); |
| 56 | } catch (e) { |
| 57 | printV(e); |
| 58 | if (e is pj_error.FfiCreateRequestError) { |
| 59 | return await _runSenderV1(sender); |
| 60 | } else if (e is HttpException) { |
| 61 | printV(e); |
| 62 | throw Exception(PayjoinSessionError.recoverable(e.toString())); |
| 63 | } else { |
| 64 | throw Exception(PayjoinSessionError.unrecoverable(e.toString())); |
| 65 | } |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | /// Attempt to send payjoin using the V2 of the protocol. |
| 70 | Future<String> _runSenderV2(Sender sender) async { |
| 71 | try { |
| 72 | final postRequest = await sender.extractV2( |
| 73 | ohttpProxyUrl: await pj_uri.Url.fromStr(PayjoinManager.randomOhttpRelayUrl()), |
| 74 | ); |
| 75 | |
| 76 | final postResult = await _postRequest(postRequest.$1); |
| 77 | final getContext = await postRequest.$2.processResponse(response: postResult); |
| 78 | |
| 79 | sendPort.send({'type': PayjoinSenderRequestTypes.requestPosted, "pj": pjUrl}); |
| 80 | |
| 81 | while (true) { |
| 82 | printV('Polling V2 Proposal Request (${pjUrl})'); |
| 83 | |
| 84 | final getRequest = await getContext.extractReq( |
| 85 | ohttpRelay: await PayjoinManager.randomOhttpRelayUrl(), |
| 86 | ); |
| 87 | final getRes = await _postRequest(getRequest.$1); |
| 88 | final proposalPsbt = await getContext.processResponse( |
| 89 | response: getRes, |
| 90 | ohttpCtx: getRequest.$2, |
| 91 | ); |
| 92 | printV("$proposalPsbt"); |
| 93 | if (proposalPsbt != null) return proposalPsbt; |
| 94 | sleep(Duration(seconds: 2)); |
| 95 | } |
| 96 | } catch (e) { |
| 97 | rethrow; |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | /// Attempt to send payjoin using the V1 of the protocol. |
| 102 | Future<String> _runSenderV1(Sender sender) async { |
| 103 | try { |
| 104 | final postRequest = await sender.extractV1(); |
| 105 | final response = await _postRequest(postRequest.$1); |
| 106 | |
| 107 | sendPort.send({'type': PayjoinSenderRequestTypes.requestPosted}); |
| 108 | |
| 109 | return await postRequest.$2.processResponse(response: response); |
| 110 | } catch (e, stack) { |
| 111 | throw PayjoinSessionError.unrecoverable('Send V1 payjoin error: $e, $stack'); |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | Future<List<int>> _postRequest(Request req) async { |
| 116 | final httpRequest = await client.post(Uri.parse(req.url.asString()), |
| 117 | headers: {'Content-Type': req.contentType}, body: req.body); |
| 118 | |
| 119 | return httpRequest.bodyBytes; |
| 120 | } |
| 121 | } |