Develop Reference

iOS Device Check - Server Side C# .net solution (JWT)

Setting up DeviceCheck on iOS is super easy, but implementing the server-side using C# is difficult as there are hardly any examples and some tricky JWT code is needed, which has to be absolutely perfect for it to work. Does anyone have a solution?

Here is a complete solution. I stripped out the first and last line from the p8 file e.g. "key begins here" (or whatever) and also took out all the new lines so that the key was just one long line
static void Main(string[] args)
{
string deviceToken = ""; //you get this from the device
string transcationId = Guid.NewGuid().ToString();
var payload = new Dictionary<string, object>() {
{ "device_token", deviceToken },
{ "timestamp", DateTimeOffset.UtcNow.ToUnixTimeSeconds() * 1000 },
{ "transaction_id", transcationId }
};
var token = GetProviderToken();
var payloadJson = JsonConvert.SerializeObject(payload);
using (var httpClient = new HttpClient())
{
using (var request = new HttpRequestMessage(new HttpMethod("POST"), "https://api.development.devicecheck.apple.com/v1/query_two_bits"))
{
request.Headers.TryAddWithoutValidation("Authorization", $"Bearer {token}");
request.Content = new StringContent(payloadJson);
request.Content.Headers.ContentType = MediaTypeHeaderValue.Parse("application/x-www-form-urlencoded");
var response = httpClient.SendAsync(request).Result;
Console.WriteLine(response);
Console.WriteLine(response.Content.ReadAsStringAsync().Result);
}
}
}
private static CngKey GetPrivateKey()
{
using (var reader = File.OpenText(#".\applekey.p8.txt"))
{
var ecPrivateKeyParameters = (ECPrivateKeyParameters)new PemReader(reader).ReadObject();
var x = ecPrivateKeyParameters.Parameters.G.AffineXCoord.GetEncoded();
var y = ecPrivateKeyParameters.Parameters.G.AffineYCoord.GetEncoded();
var d = ecPrivateKeyParameters.D.ToByteArrayUnsigned();
return EccKey.New(x, y, d);
}
}
private static string GetProviderToken()
{
var epochNow = (int)DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1)).TotalSeconds;
var payload = new Dictionary<string, object>()
{
{"iss", "<10 DIGIT TEAM CODE FROM APPLE DEV CENTER>"},
{"iat", epochNow}
};
var extraHeaders = new Dictionary<string, object>()
{
{"kid", "<THE NAME OF THE P8 FILE, 10 DIGITS>"}
};
var privateKey = GetPrivateKey();
return JWT.Encode(payload, privateKey, JwsAlgorithm.ES256, extraHeaders);
}

Bad Request with no reason

I am attempting to upgrade to newest APNS connectivity functionality but when I submit a request I get a http 400 bad request result with no reason. What am I missing / doing wrong?
Method for sending below:
public async void SendAsync(string deviceToken, string p8privateKey, string p8privateKeyId, string teamId)
{
var path = $"/3/device/{deviceToken}";
var obj = new
{
aps = new
{
alert = "test00001"
}
};
var json = Newtonsoft.Json.JsonConvert.SerializeObject(obj);
var request = new HttpRequestMessage(HttpMethod.Post, new Uri("https://api.development.push.apple.com:443" + path))
{
Version = new Version(2, 0)
};
string jwToken = CreateJwtToken(p8privateKey, p8privateKeyId, teamId);
request.Headers.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("bearer", jwToken);
request.Headers.TryAddWithoutValidation(":method", "POST");
request.Headers.TryAddWithoutValidation(":path", path);
request.Headers.Add("apns-topic", "com.the-app");
request.Content = new StringContent(json);
string sReq = JsonConvert.SerializeObject(request);
string jsonContent = request.Content.ReadAsStringAsync().Result;
WinHttpHandler handler = new WinHttpHandler();
HttpClient http = new HttpClient(handler);
var t = await http.SendAsync(request);
}
Here are the other used methods:
private static string CreateJwtToken(string p8privateKeyId, string p8privateKey, string teamId)
{
var header = JsonHelper.Serialize(new { alg = "ES256", kid = p8privateKeyId });
var payload = JsonHelper.Serialize(new { iss = teamId, iat = ToEpoch(DateTime.UtcNow) });
var key = CngKey.Import(Convert.FromBase64String(p8privateKey), CngKeyBlobFormat.Pkcs8PrivateBlob);
using (var dsa = new ECDsaCng(key))
{
dsa.HashAlgorithm = CngAlgorithm.Sha256;
var headerBase64 = Convert.ToBase64String(Encoding.UTF8.GetBytes(header));
var payloadBasae64 = Convert.ToBase64String(Encoding.UTF8.GetBytes(payload));
var unsignedJwtData = $"{headerBase64}.{payloadBasae64}";
var signature = dsa.SignData(Encoding.UTF8.GetBytes(unsignedJwtData));
return $"{unsignedJwtData}.{Convert.ToBase64String(signature)}";
}
}
private static int ToEpoch(DateTime time)
{
var span = DateTime.UtcNow - new DateTime(1970, 1, 1);
return Convert.ToInt32(span.TotalSeconds);
}
I have limited to the payload to what I think is the bear minimum requirements. I am new to jwt/http2 and APNS.
I could very well be missing something simple.

Passing json urlencode via RestSharp

I have this code which I am attempting to use to communicate an API via RestSharp.
const string task = "pay";
const string command_api_token = "9ufks6FjffGplu9HbaN7uq6XXPPVQXBP";
const string merchant_email_on_voguepay = "mymail#mail.com";
Random rnd = new Random();
string refl = DateTime.Now + rnd.Next(0,9999999).ToString();
byte[] hash_target = Encoding.Default.GetBytes(command_api_token + task + merchant_email_on_voguepay + refl);
string hashD = BitConverter.ToString(new SHA512CryptoServiceProvider().ComputeHash(hash_target)).Replace("-", string.Empty).ToUpper();
var keyValues = new Dictionary<string, string>
{
{ "task", "pay"},
{ "merchant", "3333-4444"},
{ "ref",refl},
{ "hash",hashD},
{ "amount", "20"},
{ "seller", "seller#mail.com"},
{ "remarks", "payment"},
};
//serialization using Newtonsoft JSON
string json = JsonConvert.SerializeObject(keyValues);
//url encode the json
var postString = Server.UrlEncode(json);
//calling API with Restsharp
var client = new RestClient("https://voguepay.com/api/");
var request = new RestRequest(Method.POST);
request.AddParameter("json",json);
IRestResponse response = client.Execute(request);
Textbox1.Text = response.Content;
I think the arrangement of my code is not really ok, because I keep getting error message on each move I make.
If I try to post it as it is above, I get
"response":"X006","description":"Invalid hash"...
If try to get "url encode the json" involved in the "calling API with Restsharp", I get error message as
"response":"X001","description":"Invalid Merchant Id"...
I think I am not placing things right, can someone look at my work and point out what could be the issue with this code?

I am using below code for calling API may this one help u.Here i am passing one class object u replace this by Dictionary and try..
public void insertData(OCMDataClass kycinfo, string clientId, string type)
{
try
{
using (var client = new HttpClient())
{
client.BaseAddress = new Uri(System.Configuration.ConfigurationManager.AppSettings["CBService"]);
string postBody = Newtonsoft.Json.JsonConvert.SerializeObject(kycinfo);
var jsonString = JsonConvert.SerializeObject(kycinfo);
var content = new StringContent(jsonString, System.Text.Encoding.UTF8, "application/json");
var myContent = JsonConvert.SerializeObject(kycinfo);
var buffer = System.Text.Encoding.UTF8.GetBytes(myContent);
var byteContent = new ByteArrayContent(buffer);
var result = client.PostAsync("Bfilvid/api/SvcVId/CreateKYCRepository", content).Result;
if (result.IsSuccessStatusCode)
{
string resultContent = result.Content.ReadAsStringAsync().Result;
}
else
{
string resultContent = result.Content.ReadAsStringAsync().Result;
}
}
}
catch (Exception ex)
{
}

How to post json string on some specific url

I want to log amplitude on https://api.amplitude.com/httpapi using the following code:
private void LogAmplitude()
{
using (var client = new WebClient())
{
var url = "https://api.amplitude.com/httpapi";
client.Headers[HttpRequestHeader.ContentType] = "application/json";
var model = new { user_Id = "userId", event_type = "Event" };
var jss = new JavaScriptSerializer();
var data = jss.Serialize(model);
string parameters = "api_key=" + "apiKey" + "&event=" + data;
var response = client.UploadString(url, parameters);
}
}
But when I run this method it gives me 400(bad request) error. I have tried posting the data using postman through following url:
https://api.amplitude.com/httpapi?api_key=apiKey&event={"user_id":"userId","event_type":"test"}
This works totally fine but when I try to post data using the above method it always gives me error. I am not sure what I am doing wrong because I am doing this kind of work for the very first time. So can anybody help?

In the documentation says that you can use GETwith urlencoded parameters.
Try this:
using (var client = new WebClient())
{
var url = "https://api.amplitude.com/httpapi";
client.Headers[HttpRequestHeader.ContentType] = "application/json";
var model = new { user_id = "userId", event_type = "Event" };
var jss = new JavaScriptSerializer();
var data = jss.Serialize(model);
string parameters = "api_key=" + "apiKey" + "&event=" + System.Uri.EscapeDataString(data);
var response = client.DownloadString ($"{url}?{parameters}");
}

Send file to Trimble Connect (HTTP://connect.trimble.com/)

I will need to send a some file to service (connect.trimble.com).
I do not understand, how upload a file to the service?
I have API instruction:
and I use this code:
string result = string.Empty;
string Url = "https://app.prod.gteam.com/tc/api/2.0/auth";
string TypeContent = "application/json";
string Method = "POST";
object obj = new
{
emailAddress = "MyMail",
key = "MyKey"
};
string Header = string.Empty;
result = RequestPost(Url, TypeContent, Method, Header, obj);
var qwe = result.Split(new char[] { '"' });
Header = "Bearer " + qwe[3];
Url = "https://app.prod.gteam.com/tc/api/2.0/files";
TypeContent = "multipart/form-data";
Method = "POST";
obj = new
{
parentId = "yVWsT_jewHs"
};
result = RequestPost(Url, TypeContent, Method, Header, obj);
private static string RequestPost(string Url, string TypeContent, string Method, string Header, object obj)
{
string result = string.Empty;
var httpWebRequest = (HttpWebRequest)WebRequest.Create(Url);
httpWebRequest.ContentType = TypeContent;
httpWebRequest.Method = Method;
if (!string.IsNullOrEmpty(Header))
{
httpWebRequest.Headers.Add("Authorization", Header);
}
if (obj != null)
{
using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
string json = new JavaScriptSerializer().Serialize(obj);
streamWriter.Write(json);
}
}
var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
result = streamReader.ReadToEnd();
}
return result;
}
This code return error:
The remote server returned an error: (400) Bad Request.

I found answer myself. This topic can be closed.
string Url = "app.prod.gteam.com/tc/api/2.0/files?parentId=bHHkdeBSizA";
bHHkdeBSizA - This ID is parent folder ID, where the file will located, in current API parentId may equals rootId.
public static void UploadFile(string url, string filePath, string Header)
{
using (var client = new WebClient())
{
if (!string.IsNullOrEmpty(Header))
{
client.Headers.Add("Authorization", Header);
}
byte[] result = client.UploadFile(url, filePath);
string responseAsString = Encoding.Default.GetString(result);
}
}