cake_wallet/cw_core/lib/node.dart

import 'dart:io';

import 'package:cw_core/keyable.dart';
import 'package:flutter/foundation.dart';
import 'dart:convert';
import 'package:http/http.dart' as http;
import 'package:hive/hive.dart';
import 'package:cw_core/wallet_type.dart';
import 'package:http/io_client.dart' as ioc;

part 'node.g.dart';

Uri createUriFromElectrumAddress(String address) =>
    Uri.tryParse('tcp://$address');

@HiveType(typeId: Node.typeId)
class Node extends HiveObject with Keyable {
  Node(
      {@required String uri,
      @required WalletType type,
      this.login,
      this.password,
      this.useSSL}) {
    uriRaw = uri;
    this.type = type;
  }

  Node.fromMap(Map map)
      : uriRaw = map['uri'] as String ?? '',
        login = map['login'] as String,
        password = map['password'] as String,
        typeRaw = map['typeRaw'] as int,
        useSSL = map['useSSL'] as bool;

  static const typeId = 1;
  static const boxName = 'Nodes';

  @HiveField(0)
  String uriRaw;

  @HiveField(1)
  String login;

  @HiveField(2)
  String password;

  @HiveField(3)
  int typeRaw;

  @HiveField(4)
  bool useSSL;

  bool get isSSL => useSSL ?? false;

  Uri get uri {
    switch (type) {
      case WalletType.monero:
        return Uri.http(uriRaw, '');
      case WalletType.bitcoin:
        return createUriFromElectrumAddress(uriRaw);
      case WalletType.litecoin:
        return createUriFromElectrumAddress(uriRaw);
      case WalletType.haven:
        return Uri.http(uriRaw, '');
      case WalletType.wownero:
        return Uri.http(uriRaw, '');
      default:
        return null;
    }
  }

  @override
  dynamic get keyIndex {
    _keyIndex ??= key;
    return _keyIndex;
  }

  WalletType get type => deserializeFromInt(typeRaw);

  set type(WalletType type) => typeRaw = serializeToInt(type);

  dynamic _keyIndex;

  Future<bool> requestNode() async {
    try {
      switch (type) {
        case WalletType.monero:
        case WalletType.wownero:
          return requestMoneroNode();
        case WalletType.bitcoin:
          return requestElectrumServer();
        case WalletType.litecoin:
          return requestElectrumServer();
        default:
          return false;
      }
    } catch (_) {
      return false;
    }
  }

  Future<bool> requestMoneroNode() async {
  
    final path = '/json_rpc';
    final rpcUri = isSSL ? Uri.https(uri.authority, path) : Uri.http(uri.authority, path);
    final realm = 'monero-rpc';
    final body = {
        'jsonrpc': '2.0', 
        'id': '0', 
        'method': 'get_info'
    };

    try {
      final authenticatingClient = HttpClient();
    
      authenticatingClient.addCredentials(
          rpcUri,
          realm, 
          HttpClientDigestCredentials(login ?? '', password ?? ''),
      );
    
      final http.Client client = ioc.IOClient(authenticatingClient);
    
      final response = await client.post(
          rpcUri,
          headers: {'Content-Type': 'application/json'},
          body: json.encode(body),
      );
    
      client.close();

      final resBody = json.decode(response.body) as Map<String, dynamic>;
      return !(resBody['result']['offline'] as bool);
    } catch (_) {
      return false;
    }
}

  Future<bool> requestElectrumServer() async {
    try {
      await SecureSocket.connect(uri.host, uri.port,
          timeout: Duration(seconds: 5), onBadCertificate: (_) => true);
      return true;
    } catch (_) {
      return false;
    }
  }
}