mirror of
https://github.com/cypherstack/stack_wallet.git
synced 2024-09-30 02:11:22 +00:00
816 lines
25 KiB
Dart
816 lines
25 KiB
Dart
import 'dart:convert';
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import 'package:decimal/decimal.dart';
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import 'package:flutter/foundation.dart';
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import 'package:http/http.dart' as http;
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import 'package:stackwallet/external_api_keys.dart';
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import 'package:stackwallet/models/exchange/change_now/cn_exchange_estimate.dart';
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import 'package:stackwallet/models/exchange/change_now/estimated_exchange_amount.dart';
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import 'package:stackwallet/models/exchange/change_now/exchange_transaction.dart';
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import 'package:stackwallet/models/exchange/change_now/exchange_transaction_status.dart';
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import 'package:stackwallet/models/exchange/change_now/fixed_rate_market.dart';
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import 'package:stackwallet/models/exchange/response_objects/currency.dart';
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import 'package:stackwallet/models/exchange/response_objects/pair.dart';
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import 'package:stackwallet/models/exchange/response_objects/range.dart';
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import 'package:stackwallet/services/exchange/exchange_response.dart';
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import 'package:stackwallet/utilities/logger.dart';
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class ChangeNowAPI {
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static const String scheme = "https";
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static const String authority = "api.changenow.io";
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static const String apiVersion = "/v1";
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static const String apiVersionV2 = "/v2";
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ChangeNowAPI._();
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static final ChangeNowAPI _instance = ChangeNowAPI._();
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static ChangeNowAPI get instance => _instance;
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/// set this to override using standard http client. Useful for testing
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http.Client? client;
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Uri _buildUri(String path, Map<String, dynamic>? params) {
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return Uri.https(authority, apiVersion + path, params);
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}
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Uri _buildUriV2(String path, Map<String, dynamic>? params) {
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return Uri.https(authority, apiVersionV2 + path, params);
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}
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Future<dynamic> _makeGetRequest(Uri uri) async {
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final client = this.client ?? http.Client();
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try {
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final response = await client.get(
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uri,
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headers: {'Content-Type': 'application/json'},
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);
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final parsed = jsonDecode(response.body);
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return parsed;
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} catch (e, s) {
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Logging.instance
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.log("_makeRequest($uri) threw: $e\n$s", level: LogLevel.Error);
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rethrow;
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}
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}
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Future<dynamic> _makeGetRequestV2(Uri uri, String apiKey) async {
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final client = this.client ?? http.Client();
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try {
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final response = await client.get(
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uri,
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headers: {
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// 'Content-Type': 'application/json',
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'x-changenow-api-key': apiKey,
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},
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);
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final parsed = jsonDecode(response.body);
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return parsed;
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} catch (e, s) {
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Logging.instance
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.log("_makeRequestV2($uri) threw: $e\n$s", level: LogLevel.Error);
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rethrow;
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}
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}
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Future<dynamic> _makePostRequest(
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Uri uri,
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Map<String, String> body,
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) async {
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final client = this.client ?? http.Client();
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try {
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final response = await client.post(
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uri,
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headers: {'Content-Type': 'application/json'},
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body: jsonEncode(body),
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);
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final parsed = jsonDecode(response.body);
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return parsed;
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} catch (e, s) {
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Logging.instance
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.log("_makeRequest($uri) threw: $e\n$s", level: LogLevel.Error);
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rethrow;
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}
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}
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/// This API endpoint returns the list of available currencies.
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///
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/// Set [active] to true to return only active currencies.
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/// Set [fixedRate] to true to return only currencies available on a fixed-rate flow.
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Future<ExchangeResponse<List<Currency>>> getAvailableCurrencies({
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bool? fixedRate,
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bool? active,
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}) async {
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Map<String, dynamic>? params;
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if (active != null || fixedRate != null) {
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params = {};
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if (fixedRate != null) {
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params.addAll({"fixedRate": fixedRate.toString()});
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}
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if (active != null) {
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params.addAll({"active": active.toString()});
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}
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}
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final uri = _buildUri("/currencies", params);
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try {
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// json array is expected here
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final jsonArray = await _makeGetRequest(uri);
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try {
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final result = await compute(
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_parseAvailableCurrenciesJson, jsonArray as List<dynamic>);
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return result;
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} catch (e, s) {
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Logging.instance.log("getAvailableCurrencies exception: $e\n$s",
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level: LogLevel.Error);
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return ExchangeResponse(
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exception: ExchangeException(
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"Error: $jsonArray",
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ExchangeExceptionType.serializeResponseError,
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),
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);
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}
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} catch (e, s) {
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Logging.instance.log("getAvailableCurrencies exception: $e\n$s",
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level: LogLevel.Error);
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return ExchangeResponse(
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exception: ExchangeException(
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e.toString(),
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ExchangeExceptionType.generic,
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),
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);
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}
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}
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ExchangeResponse<List<Currency>> _parseAvailableCurrenciesJson(
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List<dynamic> jsonArray) {
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try {
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List<Currency> currencies = [];
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for (final json in jsonArray) {
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try {
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currencies
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.add(Currency.fromJson(Map<String, dynamic>.from(json as Map)));
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} catch (_) {
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return ExchangeResponse(
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exception: ExchangeException("Failed to serialize $json",
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ExchangeExceptionType.serializeResponseError));
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}
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}
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return ExchangeResponse(value: currencies);
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} catch (_) {
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rethrow;
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}
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}
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/// This API endpoint returns the array of markets available for the specified currency be default.
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/// The availability of a particular pair is determined by the 'isAvailable' field.
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///
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/// Required [ticker] to fetch paired currencies for.
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/// Set [fixedRate] to true to return only currencies available on a fixed-rate flow.
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Future<ExchangeResponse<List<Currency>>> getPairedCurrencies({
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required String ticker,
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bool? fixedRate,
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}) async {
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Map<String, dynamic>? params;
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if (fixedRate != null) {
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params = {};
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params.addAll({"fixedRate": fixedRate.toString()});
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}
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final uri = _buildUri("/currencies-to/$ticker", params);
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try {
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// json array is expected here
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final jsonArray = (await _makeGetRequest(uri)) as List;
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List<Currency> currencies = [];
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try {
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for (final json in jsonArray) {
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try {
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currencies
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.add(Currency.fromJson(Map<String, dynamic>.from(json as Map)));
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} catch (_) {
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return ExchangeResponse(
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exception: ExchangeException(
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"Failed to serialize $json",
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ExchangeExceptionType.serializeResponseError,
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),
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);
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}
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}
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} catch (e, s) {
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Logging.instance.log("getPairedCurrencies exception: $e\n$s",
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level: LogLevel.Error);
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return ExchangeResponse(
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exception: ExchangeException("Error: $jsonArray",
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ExchangeExceptionType.serializeResponseError));
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}
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return ExchangeResponse(value: currencies);
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} catch (e, s) {
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Logging.instance
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.log("getPairedCurrencies exception: $e\n$s", level: LogLevel.Error);
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return ExchangeResponse(
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exception: ExchangeException(
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e.toString(),
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ExchangeExceptionType.generic,
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),
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);
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}
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}
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/// The API endpoint returns minimal payment amount required to make
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/// an exchange of [fromTicker] to [toTicker].
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/// If you try to exchange less, the transaction will most likely fail.
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Future<ExchangeResponse<Decimal>> getMinimalExchangeAmount({
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required String fromTicker,
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required String toTicker,
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String? apiKey,
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}) async {
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Map<String, dynamic>? params = {"api_key": apiKey ?? kChangeNowApiKey};
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final uri = _buildUri("/min-amount/${fromTicker}_$toTicker", params);
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try {
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// simple json object is expected here
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final json = await _makeGetRequest(uri);
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try {
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final value = Decimal.parse(json["minAmount"].toString());
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return ExchangeResponse(value: value);
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} catch (_) {
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return ExchangeResponse(
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exception: ExchangeException(
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"Failed to serialize $json",
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ExchangeExceptionType.serializeResponseError,
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),
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);
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}
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} catch (e, s) {
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Logging.instance.log("getMinimalExchangeAmount exception: $e\n$s",
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level: LogLevel.Error);
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return ExchangeResponse(
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exception: ExchangeException(
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e.toString(),
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ExchangeExceptionType.generic,
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),
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);
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}
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}
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/// The API endpoint returns minimal payment amount and maximum payment amount
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/// required to make an exchange. If you try to exchange less than minimum or
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/// more than maximum, the transaction will most likely fail. Any pair of
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/// assets has minimum amount and some of pairs have maximum amount.
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Future<ExchangeResponse<Range>> getRange({
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required String fromTicker,
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required String toTicker,
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required bool isFixedRate,
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String? apiKey,
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}) async {
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Map<String, dynamic>? params = {"api_key": apiKey ?? kChangeNowApiKey};
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final uri = _buildUri(
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"/exchange-range${isFixedRate ? "/fixed-rate" : ""}/${fromTicker}_$toTicker",
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params);
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try {
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final jsonObject = await _makeGetRequest(uri);
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final json = Map<String, dynamic>.from(jsonObject as Map);
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return ExchangeResponse(
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value: Range(
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max: Decimal.tryParse(json["maxAmount"] as String? ?? ""),
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min: Decimal.tryParse(json["minAmount"] as String? ?? ""),
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),
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);
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} catch (e, s) {
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Logging.instance.log(
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"getRange exception: $e\n$s",
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level: LogLevel.Error,
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);
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return ExchangeResponse(
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exception: ExchangeException(
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e.toString(),
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ExchangeExceptionType.generic,
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),
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);
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}
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}
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/// Get estimated amount of [toTicker] cryptocurrency to receive
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/// for [fromAmount] of [fromTicker]
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Future<ExchangeResponse<EstimatedExchangeAmount>> getEstimatedExchangeAmount({
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required String fromTicker,
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required String toTicker,
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required Decimal fromAmount,
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String? apiKey,
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}) async {
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Map<String, dynamic> params = {"api_key": apiKey ?? kChangeNowApiKey};
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final uri = _buildUri(
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"/exchange-amount/${fromAmount.toString()}/${fromTicker}_$toTicker",
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params,
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);
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try {
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// simple json object is expected here
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final json = await _makeGetRequest(uri);
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try {
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final value = EstimatedExchangeAmount.fromJson(
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Map<String, dynamic>.from(json as Map));
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return ExchangeResponse(value: value);
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} catch (_) {
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return ExchangeResponse(
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exception: ExchangeException(
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"Failed to serialize $json",
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ExchangeExceptionType.serializeResponseError,
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),
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);
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}
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} catch (e, s) {
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Logging.instance.log("getEstimatedExchangeAmount exception: $e\n$s",
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level: LogLevel.Error);
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return ExchangeResponse(
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exception: ExchangeException(
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e.toString(),
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ExchangeExceptionType.generic,
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),
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);
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}
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}
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/// Get estimated amount of [toTicker] cryptocurrency to receive
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/// for [fromAmount] of [fromTicker]
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Future<ExchangeResponse<EstimatedExchangeAmount>>
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getEstimatedExchangeAmountFixedRate({
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required String fromTicker,
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required String toTicker,
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required Decimal fromAmount,
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required bool reversed,
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String? apiKey,
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}) async {
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Map<String, dynamic> params = {"api_key": apiKey ?? kChangeNowApiKey};
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late final Uri uri;
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if (reversed) {
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uri = _buildUri(
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"/exchange-deposit/fixed-rate/${fromAmount.toString()}/${fromTicker}_$toTicker",
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params,
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);
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} else {
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uri = _buildUri(
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"/exchange-amount/fixed-rate/${fromAmount.toString()}/${fromTicker}_$toTicker",
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params,
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);
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}
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try {
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// simple json object is expected here
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final json = await _makeGetRequest(uri);
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try {
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final value = EstimatedExchangeAmount.fromJson(
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Map<String, dynamic>.from(json as Map));
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return ExchangeResponse(value: value);
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} catch (_) {
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return ExchangeResponse(
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exception: ExchangeException(
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"Failed to serialize $json",
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ExchangeExceptionType.serializeResponseError,
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),
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);
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}
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} catch (e, s) {
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Logging.instance.log("getEstimatedExchangeAmount exception: $e\n$s",
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level: LogLevel.Error);
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return ExchangeResponse(
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exception: ExchangeException(
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e.toString(),
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ExchangeExceptionType.generic,
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),
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);
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}
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}
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// old v1 version
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/// This API endpoint returns fixed-rate estimated exchange amount of
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/// [toTicker] cryptocurrency to receive for [fromAmount] of [fromTicker]
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// Future<ExchangeResponse<EstimatedExchangeAmount>>
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// getEstimatedFixedRateExchangeAmount({
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// required String fromTicker,
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// required String toTicker,
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// required Decimal fromAmount,
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// // (Optional) Use rateId for fixed-rate flow. If this field is true, you
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// // could use returned field "rateId" in next method for creating transaction
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// // to freeze estimated amount that you got in this method. Current estimated
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// // amount would be valid until time in field "validUntil"
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// bool useRateId = true,
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// String? apiKey,
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// }) async {
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// Map<String, dynamic> params = {
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// "api_key": apiKey ?? kChangeNowApiKey,
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// "useRateId": useRateId.toString(),
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// };
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//
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// final uri = _buildUri(
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// "/exchange-amount/fixed-rate/${fromAmount.toString()}/${fromTicker}_$toTicker",
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// params,
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// );
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//
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// try {
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// // simple json object is expected here
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// final json = await _makeGetRequest(uri);
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//
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// try {
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// final value = EstimatedExchangeAmount.fromJson(
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// Map<String, dynamic>.from(json as Map));
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// return ExchangeResponse(value: value);
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// } catch (_) {
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// return ExchangeResponse(
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// exception: ExchangeException(
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// "Failed to serialize $json",
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// ExchangeExceptionType.serializeResponseError,
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// ),
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// );
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// }
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// } catch (e, s) {
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// Logging.instance.log(
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// "getEstimatedFixedRateExchangeAmount exception: $e\n$s",
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// level: LogLevel.Error);
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// return ExchangeResponse(
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// exception: ExchangeException(
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// e.toString(),
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// ExchangeExceptionType.generic,
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// ),
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// );
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// }
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// }
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/// Get estimated amount of [toTicker] cryptocurrency to receive
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/// for [fromAmount] of [fromTicker]
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Future<ExchangeResponse<CNExchangeEstimate>> getEstimatedExchangeAmountV2({
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required String fromTicker,
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required String toTicker,
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required CNEstimateType fromOrTo,
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required Decimal amount,
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String? fromNetwork,
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String? toNetwork,
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CNFlowType flow = CNFlowType.standard,
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String? apiKey,
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}) async {
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Map<String, dynamic>? params = {
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"fromCurrency": fromTicker,
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"toCurrency": toTicker,
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"flow": flow.value,
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"type": fromOrTo.name,
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};
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switch (fromOrTo) {
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case CNEstimateType.direct:
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params["fromAmount"] = amount.toString();
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break;
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case CNEstimateType.reverse:
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params["toAmount"] = amount.toString();
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break;
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}
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if (fromNetwork != null) {
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params["fromNetwork"] = fromNetwork;
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}
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if (toNetwork != null) {
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params["toNetwork"] = toNetwork;
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}
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if (flow == CNFlowType.fixedRate) {
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params["useRateId"] = "true";
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}
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final uri = _buildUriV2("/exchange/estimated-amount", params);
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try {
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// simple json object is expected here
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final json = await _makeGetRequestV2(uri, apiKey ?? kChangeNowApiKey);
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try {
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final value =
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CNExchangeEstimate.fromJson(Map<String, dynamic>.from(json as Map));
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return ExchangeResponse(value: value);
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} catch (_) {
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return ExchangeResponse(
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exception: ExchangeException(
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"Failed to serialize $json",
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ExchangeExceptionType.serializeResponseError,
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),
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);
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}
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} catch (e, s) {
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Logging.instance.log("getEstimatedExchangeAmountV2 exception: $e\n$s",
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level: LogLevel.Error);
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return ExchangeResponse(
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exception: ExchangeException(
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e.toString(),
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ExchangeExceptionType.generic,
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),
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);
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}
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}
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/// This API endpoint returns the list of all the pairs available on a
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/// fixed-rate flow. Some currencies get enabled or disabled from time to
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/// time and the market info gets updates, so make sure to refresh the list
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/// occasionally. One time per minute is sufficient.
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Future<ExchangeResponse<List<FixedRateMarket>>> getAvailableFixedRateMarkets({
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String? apiKey,
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}) async {
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final uri = _buildUri(
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"/market-info/fixed-rate/${apiKey ?? kChangeNowApiKey}", null);
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try {
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// json array is expected here
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final jsonArray = await _makeGetRequest(uri);
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try {
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final result =
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await compute(_parseFixedRateMarketsJson, jsonArray as List);
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return result;
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} catch (e, s) {
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Logging.instance.log("getAvailableFixedRateMarkets exception: $e\n$s",
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level: LogLevel.Error);
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return ExchangeResponse(
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exception: ExchangeException(
|
|
"Error: $jsonArray",
|
|
ExchangeExceptionType.serializeResponseError,
|
|
),
|
|
);
|
|
}
|
|
} catch (e, s) {
|
|
Logging.instance.log("getAvailableFixedRateMarkets exception: $e\n$s",
|
|
level: LogLevel.Error);
|
|
return ExchangeResponse(
|
|
exception: ExchangeException(
|
|
e.toString(),
|
|
ExchangeExceptionType.generic,
|
|
),
|
|
);
|
|
}
|
|
}
|
|
|
|
ExchangeResponse<List<FixedRateMarket>> _parseFixedRateMarketsJson(
|
|
List<dynamic> jsonArray) {
|
|
try {
|
|
List<FixedRateMarket> markets = [];
|
|
for (final json in jsonArray) {
|
|
try {
|
|
markets.add(
|
|
FixedRateMarket.fromJson(Map<String, dynamic>.from(json as Map)));
|
|
} catch (_) {
|
|
return ExchangeResponse(
|
|
exception: ExchangeException("Failed to serialize $json",
|
|
ExchangeExceptionType.serializeResponseError));
|
|
}
|
|
}
|
|
return ExchangeResponse(value: markets);
|
|
} catch (_) {
|
|
rethrow;
|
|
}
|
|
}
|
|
|
|
/// The API endpoint creates a transaction, generates an address for
|
|
/// sending funds and returns transaction attributes.
|
|
Future<ExchangeResponse<ExchangeTransaction>>
|
|
createStandardExchangeTransaction({
|
|
required String fromTicker,
|
|
required String toTicker,
|
|
required String receivingAddress,
|
|
required Decimal amount,
|
|
String extraId = "",
|
|
String userId = "",
|
|
String contactEmail = "",
|
|
String refundAddress = "",
|
|
String refundExtraId = "",
|
|
String? apiKey,
|
|
}) async {
|
|
final Map<String, String> map = {
|
|
"from": fromTicker,
|
|
"to": toTicker,
|
|
"address": receivingAddress,
|
|
"amount": amount.toString(),
|
|
"flow": "standard",
|
|
"extraId": extraId,
|
|
"userId": userId,
|
|
"contactEmail": contactEmail,
|
|
"refundAddress": refundAddress,
|
|
"refundExtraId": refundExtraId,
|
|
};
|
|
|
|
final uri = _buildUri("/transactions/${apiKey ?? kChangeNowApiKey}", null);
|
|
|
|
try {
|
|
// simple json object is expected here
|
|
final json = await _makePostRequest(uri, map);
|
|
|
|
// pass in date to prevent using default 1970 date
|
|
json["date"] = DateTime.now().toString();
|
|
|
|
try {
|
|
final value = ExchangeTransaction.fromJson(
|
|
Map<String, dynamic>.from(json as Map));
|
|
return ExchangeResponse(value: value);
|
|
} catch (_) {
|
|
return ExchangeResponse(
|
|
exception: ExchangeException(
|
|
"Failed to serialize $json",
|
|
ExchangeExceptionType.serializeResponseError,
|
|
),
|
|
);
|
|
}
|
|
} catch (e, s) {
|
|
Logging.instance.log(
|
|
"createStandardExchangeTransaction exception: $e\n$s",
|
|
level: LogLevel.Error);
|
|
return ExchangeResponse(
|
|
exception: ExchangeException(
|
|
e.toString(),
|
|
ExchangeExceptionType.generic,
|
|
),
|
|
);
|
|
}
|
|
}
|
|
|
|
/// The API endpoint creates a transaction, generates an address for
|
|
/// sending funds and returns transaction attributes.
|
|
Future<ExchangeResponse<ExchangeTransaction>>
|
|
createFixedRateExchangeTransaction({
|
|
required String fromTicker,
|
|
required String toTicker,
|
|
required String receivingAddress,
|
|
required Decimal amount,
|
|
required String rateId,
|
|
String extraId = "",
|
|
String userId = "",
|
|
String contactEmail = "",
|
|
String refundAddress = "",
|
|
String refundExtraId = "",
|
|
String? apiKey,
|
|
}) async {
|
|
final Map<String, String> map = {
|
|
"from": fromTicker,
|
|
"to": toTicker,
|
|
"address": receivingAddress,
|
|
"amount": amount.toString(),
|
|
"flow": "fixed-rate",
|
|
"extraId": extraId,
|
|
"userId": userId,
|
|
"contactEmail": contactEmail,
|
|
"refundAddress": refundAddress,
|
|
"refundExtraId": refundExtraId,
|
|
"rateId": rateId,
|
|
};
|
|
|
|
final uri = _buildUri(
|
|
"/transactions/fixed-rate/${apiKey ?? kChangeNowApiKey}", null);
|
|
|
|
try {
|
|
// simple json object is expected here
|
|
final json = await _makePostRequest(uri, map);
|
|
|
|
// pass in date to prevent using default 1970 date
|
|
json["date"] = DateTime.now().toString();
|
|
|
|
try {
|
|
final value = ExchangeTransaction.fromJson(
|
|
Map<String, dynamic>.from(json as Map));
|
|
return ExchangeResponse(value: value);
|
|
} catch (_) {
|
|
return ExchangeResponse(
|
|
exception: ExchangeException(
|
|
"Failed to serialize $json",
|
|
ExchangeExceptionType.serializeResponseError,
|
|
),
|
|
);
|
|
}
|
|
} catch (e, s) {
|
|
Logging.instance.log(
|
|
"createFixedRateExchangeTransaction exception: $e\n$s",
|
|
level: LogLevel.Error);
|
|
return ExchangeResponse(
|
|
exception: ExchangeException(
|
|
e.toString(),
|
|
ExchangeExceptionType.generic,
|
|
),
|
|
);
|
|
}
|
|
}
|
|
|
|
Future<ExchangeResponse<ExchangeTransactionStatus>> getTransactionStatus({
|
|
required String id,
|
|
String? apiKey,
|
|
}) async {
|
|
final uri =
|
|
_buildUri("/transactions/$id/${apiKey ?? kChangeNowApiKey}", null);
|
|
|
|
try {
|
|
// simple json object is expected here
|
|
final json = await _makeGetRequest(uri);
|
|
|
|
try {
|
|
final value = ExchangeTransactionStatus.fromJson(
|
|
Map<String, dynamic>.from(json as Map));
|
|
return ExchangeResponse(value: value);
|
|
} catch (_) {
|
|
return ExchangeResponse(
|
|
exception: ExchangeException(
|
|
"Failed to serialize $json",
|
|
ExchangeExceptionType.serializeResponseError,
|
|
),
|
|
);
|
|
}
|
|
} catch (e, s) {
|
|
Logging.instance
|
|
.log("getTransactionStatus exception: $e\n$s", level: LogLevel.Error);
|
|
return ExchangeResponse(
|
|
exception: ExchangeException(
|
|
e.toString(),
|
|
ExchangeExceptionType.generic,
|
|
),
|
|
);
|
|
}
|
|
}
|
|
|
|
Future<ExchangeResponse<List<Pair>>> getAvailableFloatingRatePairs({
|
|
bool includePartners = false,
|
|
}) async {
|
|
final uri = _buildUri("/market-info/available-pairs",
|
|
{"includePartners": includePartners.toString()});
|
|
|
|
try {
|
|
// json array is expected here
|
|
final jsonArray = await _makeGetRequest(uri);
|
|
|
|
try {
|
|
final result = await compute(
|
|
_parseAvailableFloatingRatePairsJson, jsonArray as List);
|
|
return result;
|
|
} catch (e, s) {
|
|
Logging.instance.log("getAvailableFloatingRatePairs exception: $e\n$s",
|
|
level: LogLevel.Error);
|
|
return ExchangeResponse(
|
|
exception: ExchangeException(
|
|
"Error: $jsonArray",
|
|
ExchangeExceptionType.serializeResponseError,
|
|
),
|
|
);
|
|
}
|
|
} catch (e, s) {
|
|
Logging.instance.log("getAvailableFloatingRatePairs exception: $e\n$s",
|
|
level: LogLevel.Error);
|
|
return ExchangeResponse(
|
|
exception: ExchangeException(
|
|
e.toString(),
|
|
ExchangeExceptionType.generic,
|
|
),
|
|
);
|
|
}
|
|
}
|
|
|
|
ExchangeResponse<List<Pair>> _parseAvailableFloatingRatePairsJson(
|
|
List<dynamic> jsonArray) {
|
|
try {
|
|
List<Pair> pairs = [];
|
|
for (final json in jsonArray) {
|
|
try {
|
|
final List<String> stringPair = (json as String).split("_");
|
|
pairs.add(
|
|
Pair(
|
|
from: stringPair[0],
|
|
to: stringPair[1],
|
|
fromNetwork: "",
|
|
toNetwork: "",
|
|
fixedRate: false,
|
|
floatingRate: true,
|
|
),
|
|
);
|
|
} catch (_) {
|
|
return ExchangeResponse(
|
|
exception: ExchangeException("Failed to serialize $json",
|
|
ExchangeExceptionType.serializeResponseError));
|
|
}
|
|
}
|
|
return ExchangeResponse(value: pairs);
|
|
} catch (_) {
|
|
rethrow;
|
|
}
|
|
}
|
|
}
|