import 'dart:convert';
import 'dart:io';
import 'package:crypto/crypto.dart';
import 'package:http/http.dart';
import 'package:uuid/uuid.dart';
import 'package:flutter/material.dart';
const SUB_SUM_URL = 'https://api.sumsub.com';
const APP_TOKEN = 'APP_TOKEN';
const SECRETE_KEY = 'SECRETE_KEY';
class GetApplicantUI extends StatefulWidget {
static String tag = '/GetApplicantUI';
@override
GetApplicantUIState createState() => GetApplicantUIState();
}
class GetApplicantUIState extends State<GetApplicantUI> {
@override
void initState() {
super.initState();
}
@override
void setState(fn) {
if (mounted) super.setState(fn);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text("SumSub")),
body: TextButton(
onPressed: () {
var externalUserId = Uuid().v4();
Map req = {
"externalUserId": externalUserId,
};
createApplicant((req)).then((value) {
print(value);
}).catchError((e) {
print(e.toString());
});
},
child: Text("Get Applicant ID"),
),
);
}
}
Future<ApplicantModel> createApplicant(Map req) async {
return ApplicantModel.fromJson(await handleResponse(await buildHttpResponse('/resources/applicants?levelName=basic-kyc-level', request: req, method: HttpMethod.POST)));
}
Map<String, String> buildHeaderTokens(HttpMethod httpMethod, String endPoint, [Map? request]) {
var stamp = new DateTime.now().millisecondsSinceEpoch ~/ 1000;
Map<String, String> header = {
"X-App-Token": APP_TOKEN,
"X-App-Access-Sig": createSignature(httpMethod, endPoint, request),
"X-App-Access-Ts": stamp.toString(),
HttpHeaders.acceptHeader: 'application/json',
HttpHeaders.connectionHeader: 'application/json; charset=utf-8',
};
return header;
}
String createSignature(HttpMethod httpMethod, String path, Map? request) {
int timestamp = new DateTime.now().millisecondsSinceEpoch ~/ 1000;
var valueToSign = timestamp.toString() + httpMethod.name + path + request.toString();
var key = utf8.encode(SECRETE_KEY);
var bytes = utf8.encode(valueToSign);
var hmacSha256 = Hmac(sha512, key);
var digest = hmacSha256.convert(bytes);
return digest.toString();
}
Uri buildBaseUrl(String endPoint) {
Uri url = Uri.parse(endPoint);
if (!endPoint.startsWith('http')) url = Uri.parse('$SUB_SUM_URL$endPoint');
return url;
}
Future<Response> buildHttpResponse(String endPoint, {HttpMethod method = HttpMethod.POST, Map? request}) async {
var headers = buildHeaderTokens(method, endPoint, request);
Uri url = buildBaseUrl(endPoint);
Response response;
response = await post(url, body: jsonEncode(request), headers: headers, encoding: Encoding.getByName('utf-8'));
return response;
}
Future handleResponse(Response response, [bool? avoidTokenError]) async {
if (response.statusCode == 401) {
throw 'Try again';
}
if (response.statusCode == 200) {
return jsonDecode(response.body);
} else {
try {
var body = jsonDecode(response.body);
throw body['message'];
} on Exception catch (e) {
print(e.toString());
throw "Something went wrong";
}
}
}
enum HttpMethod { GET, POST, DELETE, PUT }
``
