mirror of
https://github.com/cypherstack/stack_wallet.git
synced 2024-11-18 02:07:43 +00:00
715 lines
22 KiB
Dart
715 lines
22 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/available_floating_rate_pair.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/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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/// 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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// 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(
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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("getAvailableFixedRateMarkets 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<FixedRateMarket>> _parseFixedRateMarketsJson(
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List<dynamic> jsonArray) {
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try {
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List<FixedRateMarket> markets = [];
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for (final json in jsonArray) {
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try {
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markets.add(
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FixedRateMarket.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: markets);
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} catch (_) {
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rethrow;
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}
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}
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/// The API endpoint creates a transaction, generates an address for
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/// sending funds and returns transaction attributes.
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Future<ExchangeResponse<ExchangeTransaction>>
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createStandardExchangeTransaction({
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required String fromTicker,
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required String toTicker,
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required String receivingAddress,
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required Decimal amount,
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String extraId = "",
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String userId = "",
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String contactEmail = "",
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String refundAddress = "",
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String refundExtraId = "",
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String? apiKey,
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}) async {
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final Map<String, String> map = {
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"from": fromTicker,
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"to": toTicker,
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"address": receivingAddress,
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"amount": amount.toString(),
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"flow": "standard",
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"extraId": extraId,
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"userId": userId,
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"contactEmail": contactEmail,
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"refundAddress": refundAddress,
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"refundExtraId": refundExtraId,
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};
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final uri = _buildUri("/transactions/${apiKey ?? kChangeNowApiKey}", null);
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try {
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// simple json object is expected here
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final json = await _makePostRequest(uri, map);
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// pass in date to prevent using default 1970 date
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json["date"] = DateTime.now().toString();
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try {
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final value = ExchangeTransaction.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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"createStandardExchangeTransaction 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 creates a transaction, generates an address for
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/// sending funds and returns transaction attributes.
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Future<ExchangeResponse<ExchangeTransaction>>
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createFixedRateExchangeTransaction({
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required String fromTicker,
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required String toTicker,
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required String receivingAddress,
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required Decimal amount,
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required String rateId,
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String extraId = "",
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String userId = "",
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String contactEmail = "",
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String refundAddress = "",
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String refundExtraId = "",
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String? apiKey,
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}) async {
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final Map<String, String> map = {
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"from": fromTicker,
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"to": toTicker,
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"address": receivingAddress,
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"amount": amount.toString(),
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"flow": "fixed-rate",
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"extraId": extraId,
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"userId": userId,
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"contactEmail": contactEmail,
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"refundAddress": refundAddress,
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"refundExtraId": refundExtraId,
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"rateId": rateId,
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};
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final uri = _buildUri(
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"/transactions/fixed-rate/${apiKey ?? kChangeNowApiKey}", null);
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try {
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// simple json object is expected here
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final json = await _makePostRequest(uri, map);
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// pass in date to prevent using default 1970 date
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json["date"] = DateTime.now().toString();
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try {
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final value = ExchangeTransaction.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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"createFixedRateExchangeTransaction 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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Future<ExchangeResponse<ExchangeTransactionStatus>> getTransactionStatus({
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required String id,
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String? apiKey,
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}) async {
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final uri =
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_buildUri("/transactions/$id/${apiKey ?? kChangeNowApiKey}", null);
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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 = ExchangeTransactionStatus.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
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.log("getTransactionStatus 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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Future<ExchangeResponse<List<AvailableFloatingRatePair>>>
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getAvailableFloatingRatePairs({
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bool includePartners = false,
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}) async {
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final uri = _buildUri("/market-info/available-pairs",
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{"includePartners": includePartners.toString()});
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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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_parseAvailableFloatingRatePairsJson, jsonArray as List);
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return result;
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} catch (e, s) {
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Logging.instance.log("getAvailableFloatingRatePairs 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("getAvailableFloatingRatePairs 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<AvailableFloatingRatePair>>
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_parseAvailableFloatingRatePairsJson(List<dynamic> jsonArray) {
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try {
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List<AvailableFloatingRatePair> pairs = [];
|
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for (final json in jsonArray) {
|
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try {
|
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final List<String> stringPair = (json as String).split("_");
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pairs.add(AvailableFloatingRatePair(
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fromTicker: stringPair[0], toTicker: stringPair[1]));
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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: pairs);
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} catch (_) {
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rethrow;
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}
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}
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}
|