I'm developing Xamarin Cross platform application. I'm trying to connect to server (http://test.net/login/clientlogin), I need to send these fields (password = "xyz"; platform = iphone; (useremail) = "test#test.com";) along with the request. So that server will check these parameters and returns XML. But we don't know how to add these fields to the request.
When i open the above string url (http://*****/login/clientlogin) i am getting login screen, with in that we have username, password and platform text fields.
Thanks in advance!!!..
This should get you started presuming you are adding the values as headers in the request:
public class TestClient
{
HttpClient client;
public TestClient(){
this.client = new HttpClient ();
}
public void AddHeadersAndGet(){
client.DefaultRequestHeaders.Add ("username", "whatevertheusernameis");
this.GetAsync<WhateverObjectTypeYouAreReceiving> ("theurloftheservice");
}
public async Task<T> GetAsync<T>(string address){
HttpResponseMessage response = null;
response = await client.GetAsync (address);
if (response.IsSuccessStatusCode) {
try {
var responseString = await response.Content.ReadAsStringAsync ();
return new T (Serializer.DeserializeObject<T> (responseString),
response.StatusCode);
} catch (Exception ex) {
}
} else {
}
}
}
The key line for you is:
client.DefaultRequestHeaders.Add ("username", "whatevertheusernameis");
Related
I am working on xamarin forms where I am using MSAL for authentication to authenticate. Now I want to sign out the user once he clicks on the sign-out. For sign out, I wrote Below code
foreach (var user in await App.PCA.GetAccountsAsync())
{
await App.PCA.RemoveAsync(user);
}
The above code is executing without any problem but when I again try to log in it is not asking for the password. I am clearing the cookies from the app using dependency service like
created one interface in xamarin forms project
public interface IAuthentication
{
void ClearAllCookies();
}
And in the android project providing the implementation for the interface
public void ClearAllCookies()
{
CookieManager.Instance.RemoveSessionCookie();
CookieManager.Instance.RemoveAllCookie();
}
I am doing Authentication like below
In App.xamal.cs file
public static IPublicClientApplication PCA = null;
public static string ClientID = "xxxxxxxxxxxxxxxxxxxx";
public static string[] Scopes = { "User.Read" };
public App()
{
PCA = PublicClientApplicationBuilder.Create(ClientID)
.WithRedirectUri($"msal{ClientID}://auth")
.Build();
InitializeComponent();
}
//On login button click
AuthenticationResult authResult = null;
IEnumerable<IAccount> accounts = await App.PCA.GetAccountsAsync();
try
{
IAccount firstAccount = accounts.FirstOrDefault();
authResult = await App.PCA.AcquireTokenSilent(App.Scopes, firstAccount)
.ExecuteAsync();
}
catch (MsalUiRequiredException)
{
try
{
authResult = await App.PCA.AcquireTokenInteractive(App.Scopes)
.WithLoginHint(EmailId) //Here I am passing Email Id
.WithParentActivityOrWindow(App.ParentWindow)
.ExecuteAsync();
}
catch (Exception ex2)
{
await DisplayAlert("Acquire token interactive failed. See exception message for details: ", ex2.Message, "Dismiss");
}
}
if (authResult != null)
{
var content = await GetHttpContentWithTokenAsync(authResult.AccessToken);
await Navigation.PushModalAsync(new Dashboard.PartnerDashboard(content));
}
}
After clearing again it is not asking for the password. If I uninstall and reinstall the app also it is not asking for the password. How to resolve this?
Can you try with the below code for clearing accounts in MSAL.
public void ClearAllCookies(string authority)
{
var authContext = new AuthenticationContext(authority);
authContext.TokenCache.Clear();
CookieManager.Instance.RemoveSessionCookie();
CookieManager.Instance.RemoveAllCookie();
}
where authority = "https://login.windows.net/common";
Try below code before authenticate code running, for removing old accounts.
var authContext = new AuthenticationContext(authority);
if(authContext.TokenCache.ReadItems().Any())
{
authContext = new AuthenticationContext(authContext.TokenCache.ReadItems().First().Authority,false, null);
}
I am using the HttpClient but my results are taking up to 6 seconds coming back from the same machine on the same subnet and ip range of 192.168. When I call the api directly from the ip address the results are more or less instant so why is it so slow with httpclient on the same computer.
I have seen other so's that suggest set to use proxy as false is the best way to go.
I have also tested this on a stock phone and it takes around 8 seconds for the login to be successful on the phone.
private HttpClient _client;
public async Task<String> Getusers()
{
var content = "";
HttpClientHandler hch = new HttpClientHandler();
hch.Proxy = null;
hch.UseProxy = false;
_client = new HttpClient(hch);
var uri = new Uri(Constants.ApiEndPoint + "/Users"); // Your url is here
try
{
var response = await _client.GetAsync(uri);
if (response.IsSuccessStatusCode)
{
content = await response.Content.ReadAsStringAsync();
}
}
catch (Exception ex)
{
throw ex;
}
return content;
}
Here is my login method in case anyone can see something wrong with it.
private async void BtnLogin_Clicked(object sender, EventArgs e)
{
string content = await Getusers(); //Sends a GET request to the specified Uri and returns the response body as a string in an asynchronous operation
List<Users> _users = JsonConvert.DeserializeObject<List<Users>>(content); //Deserializes or converts JSON String into a collection of Post
var userName = txtUserName.Text;
var password = txtPassword.Text;
var isValidUser = _users.Where(w => w.UserName == userName && w.password == password).FirstOrDefault();
var driverId = _users.Where(w => w.UserName == userName && w.password == password).FirstOrDefault().ID;
if (isValidUser != null)
{
Application.Current.Properties["driverId"] = driverId;
Application.Current.MainPage = new MainPage();
}
else
{
lblError.Text = "Error your credentials are invalid, please try again";
}
}
I can't figure out why when I try to connect from Xamarin Context.User.Indetity.Name is empty. Is there anything special I need to do? I logged in to the server and the user has a connection stablished. After that I use the following code:
var Connection = new HubConnection(Url);
_hub = Connection.CreateHubProxy(hubName);
_hub.On(srvEvent, onData);
await Connection.Start();
But I never get the username. What am I doing wrong?
Here's the code for the server:
var name = Context.User.Identity.Name;
Connections.Add(name, Context.ConnectionId);
return base.OnConnected();
It works when it comes from the web app, not from the xamarin app.
Thanks!
Here is the code I was telling you about.
I'm using an external OAuth2 server for authentication, so I must pass the access token to SignalR somehow, because SignalR uses web sockets for the messages back and forth I can't pass the access token in the header because this is not supported by web sockets.
I'm passing that access token as a query string parameter this way (Javascript client)
$.connection.hub.qs = "access_token=" + mytoken;
Then on my SignalR I added a middleware that takes that query string and adds it to the header as an Authorization header using Bearer Token. This is done this way in my startup class
app.UseAuthQSTokenExtractor();
The code for the middleware is this one
namespace Owin
{
public static class AuthorizationQSTokenExtractorExtension
{
public static void UseAuthQSTokenExtractor(this IAppBuilder app)
{
app.Use<AuthorizationQsTokenExtractorMiddleware>();
}
}
}
namespace Chat.Middleware
{
public class AuthorizationQsTokenExtractorMiddleware : OwinMiddleware
{
public AuthorizationQsTokenExtractorMiddleware(OwinMiddleware next)
: base(next)
{
}
public override async Task Invoke(IOwinContext context)
{
Debug.WriteLine("signalr-auth-middleware");
string bearerToken = context.Request.Query.Get("access_token");
Debug.WriteLine("signar-bearer: " + bearerToken);
if (bearerToken != null)
{
TokenHelper.DecodeAndWrite(bearerToken);
string[] authorization = { "Bearer " + bearerToken };
context.Request.Headers.Add("Authorization", authorization);
}
await Next.Invoke(context);
}
}
My startup class then looks like this
app.UseCors(CorsOptions.AllowAll);
app.UseAuthQSTokenExtractor();
JwtSecurityTokenHandler.InboundClaimTypeMap = new Dictionary<string, string>();
app.UseIdentityServerBearerTokenAuthentication(
new IdentityServerBearerTokenAuthenticationOptions
{
Authority = ConfigurationManager.AppSettings["api:idserver"],
RequiredScopes = new[]
{
"chat-hub"
}
});
var hubConfiguration = new HubConfiguration ();
hubConfiguration.EnableDetailedErrors = true;
app.RunSignalR(hubConfiguration);
You can see in the code above where I tell SignalR to use the Oauth2 Server, that code is this one
app.UseIdentityServerBearerTokenAuthentication(
new IdentityServerBearerTokenAuthenticationOptions
{
Authority = ConfigurationManager.AppSettings["api:idserver"],
RequiredScopes = new[]
{
"chat-hub"
}
});
After all this is set up I have access to my Context.User.Identity.Name and if you want to get the others IdentityClaim you can do this
var identity = Context.User.Identity as ClaimsIdentity;
Which I'm using that code above to get the subjectId (userid) like this
public static string[] GetIdentityClaimsIssSub(HubCallerContext Context)
{
var identity = Context.User.Identity as ClaimsIdentity;
if (identity == null)
return null;
var issuerFromIdentity = identity.FindFirst("iss");
var subFromIdentity = identity.FindFirst("sub");
if (issuerFromIdentity == null || subFromIdentity == null)
return null;
return new string[] { issuerFromIdentity.Value, subFromIdentity.Value };
}
I hope it helps
I m trying to use http request webservice issue is that when we post wrong username and password the login service generate exception and it can't return any value in async calls.
A code snippet would help assist with the problem ...
However using a try catch should help you catch your exception and prevent application from crashing and handling the exceptions accordingly.
As seen in my sample code below I cater for the incorrect details entered / connectivity problems. I peform the http async request then parse the xml to my model handling the exceptions accordingly
var response = await WebRequestHelper.MakeAsyncRequest(url, content);
if (response.IsSuccessStatusCode == true)
{
Debug.WriteLine("Login Successfull" + "result.IsSuccessStatusCode" + response.IsSuccessStatusCode);
var result = response.Content.ReadAsStringAsync().Result;
result = result.Replace("<xml>", "<LoginResult>").Replace("</xml>", "</LoginResult>");
loginResult = XMLHelper.FromXml<LoginResult>(result);
if (loginResult != null)
{
login.Type = ResultType.OK;
login.Result = loginResult;
}
else
{
login.Type = ResultType.WrongDetails;
}
}
else
{
Debug.WriteLine("Login Failed" + "result.IsSuccessStatusCode" + response.IsSuccessStatusCode);
login.Type = ResultType.WrongDetails;
}
}
catch (Exception ex)
{
login.Type = ResultType.ConnectivityProblem;
}
Web Request
public static async Task<HttpResponseMessage> MakeAsyncRequest(string url, Dictionary<string, string> content)
{
var httpClient = new HttpClient();
httpClient.Timeout = new TimeSpan(0, 5, 0);
httpClient.BaseAddress = new Uri(url);
httpClient.DefaultRequestHeaders.TryAddWithoutValidation("Content-Type: application/x-www-form-urlencoded", "application/json");
if (content == null)
{
content = new Dictionary<string, string>();
}
var encodedContent = new FormUrlEncodedContent(content);
var result = await httpClient.PostAsync(httpClient.BaseAddress, encodedContent);
return result;
I would recommend wrapping the response in a generic ServiceResponse where you can store the exceptions. await methods can be included in try/catch blocks so the standard process can be followed.
E.G.
public async Task<ServiceResponse<T>> PostAsync<T>(String address, object dto){
var content = Serializer.SerializeObject (dto);
var response = await client.PostAsync (
address,
new StringContent (content));
if (response.IsSuccessStatusCode) {
try {
var responseString = await response.Content.ReadAsStringAsync ();
return new ServiceResponse<T> (Serializer.DeserializeObject<T> (responseString),
response.StatusCode);
} catch (Exception ex) {
return new ServiceResponse<T> (response.StatusCode, ex);
}
} else {
return new ServiceResponse<T> (response.StatusCode);
}
}
With the ServiceResponse defined as :
public class ServiceResponse<T>
{
public HttpStatusCode StatusCode { get; set;}
public T Value { get; set;}
public String Content { get; set;}
public Exception Error {get;set;}
public ServiceResponse(T value, HttpStatusCode httpStatusCode){
this.Value = value;
this.StatusCode = httpStatusCode;
}
public ServiceResponse(HttpStatusCode httpStatusCode, Exception error = null){
this.StatusCode = httpStatusCode;
this.Error = error;
}
}
This will give you a clean way of managing all your HTTP responses and any errors that may occur.
This is a fairly long piece of code but I am getting nowhere with this and cannot see any issues, although I am new to using notification hubs. I am trying to register for targeted notifications (the logged on user) using the notification hub in Azure. After the registration, a test notification is sent.
The issue I am having is that sometimes the notification is sent to the device, and sometimes it is not. It mostly isn't but occasionally when I step through the code on the server, i will get the notification on the emulator come through. Once when I deployed the app to my phone the notification came though on the emulator! I cannot discover a pattern.
My Controller class looks like this;
private NotificationHelper hub;
public RegisterController()
{
hub = NotificationHelper.Instance;
}
public async Task<RegistrationDescription> Post([FromBody]JObject registrationCall)
{
var obj = await hub.Post(registrationCall);
return obj;
}
And the helper class (which is used elsewhere so is not directly in the controller) looks like this;
public static NotificationHelper Instance = new NotificationHelper();
public NotificationHubClient Hub { get; set; }
// Create the client in the constructor.
public NotificationHelper()
{
var cn = "<my-cn>";
Hub = NotificationHubClient.CreateClientFromConnectionString(cn, "<my-hub>");
}
public async Task<RegistrationDescription> Post([FromBody] JObject registrationCall)
{
// Get the registration info that we need from the request.
var platform = registrationCall["platform"].ToString();
var installationId = registrationCall["instId"].ToString();
var channelUri = registrationCall["channelUri"] != null
? registrationCall["channelUri"].ToString()
: null;
var deviceToken = registrationCall["deviceToken"] != null
? registrationCall["deviceToken"].ToString()
: null;
var userName = HttpContext.Current.User.Identity.Name;
// Get registrations for the current installation ID.
var regsForInstId = await Hub.GetRegistrationsByTagAsync(installationId, 100);
var updated = false;
var firstRegistration = true;
RegistrationDescription registration = null;
// Check for existing registrations.
foreach (var registrationDescription in regsForInstId)
{
if (firstRegistration)
{
// Update the tags.
registrationDescription.Tags = new HashSet<string>() {installationId, userName};
// We need to handle each platform separately.
switch (platform)
{
case "windows":
var winReg = registrationDescription as MpnsRegistrationDescription;
winReg.ChannelUri = new Uri(channelUri);
registration = await Hub.UpdateRegistrationAsync(winReg);
break;
case "ios":
var iosReg = registrationDescription as AppleRegistrationDescription;
iosReg.DeviceToken = deviceToken;
registration = await Hub.UpdateRegistrationAsync(iosReg);
break;
}
updated = true;
firstRegistration = false;
}
else
{
// We shouldn't have any extra registrations; delete if we do.
await Hub.DeleteRegistrationAsync(registrationDescription);
}
}
// Create a new registration.
if (!updated)
{
switch (platform)
{
case "windows":
registration = await Hub.CreateMpnsNativeRegistrationAsync(channelUri,
new string[] {installationId, userName});
break;
case "ios":
registration = await Hub.CreateAppleNativeRegistrationAsync(deviceToken,
new string[] {installationId, userName});
break;
}
}
// Send out a test notification.
await SendNotification(string.Format("Test notification for {0}", userName), userName);
return registration;
And finally, my SendNotification method is here;
internal async Task SendNotification(string notificationText, string tag)
{
try
{
var toast = PrepareToastPayload("<my-hub>", notificationText);
// Send a notification to the logged-in user on both platforms.
await NotificationHelper.Instance.Hub.SendMpnsNativeNotificationAsync(toast, tag);
//await hubClient.SendAppleNativeNotificationAsync(alert, tag);
}
catch (ArgumentException ex)
{
// This is expected when an APNS registration doesn't exist.
Console.WriteLine(ex.Message);
}
}
I suspect the issue is in my phone client code, which is here and SubscribeToService is called immediately after WebAPI login;
public void SubscribeToService()
{
_channel = HttpNotificationChannel.Find("mychannel");
if (_channel == null)
{
_channel = new HttpNotificationChannel("mychannel");
_channel.Open();
_channel.BindToShellToast();
}
_channel.ChannelUriUpdated += async (o, args) =>
{
var hub = new NotificationHub("<my-hub>", "<my-cn>");
await hub.RegisterNativeAsync(args.ChannelUri.ToString());
await RegisterForMessageNotificationsAsync();
};
}
public async Task RegisterForMessageNotificationsAsync()
{
using (var client = GetNewHttpClient(true))
{
// Get the info that we need to request registration.
var installationId = LocalStorageManager.GetInstallationId(); // a new Guid
var registration = new Dictionary<string, string>()
{
{"platform", "windows"},
{"instId", installationId},
{"channelUri", _channel.ChannelUri.ToString()}
};
var request = new HttpRequestMessage(HttpMethod.Post, new Uri(ApiUrl + "api/Register/RegisterForNotifications"));
request.Content = new StringContent(JsonConvert.SerializeObject(registration), Encoding.UTF8, "application/json");
string message;
try
{
HttpResponseMessage response = await client.SendAsync(request);
message = await response.Content.ReadAsStringAsync();
}
catch (Exception ex)
{
message = ex.Message;
}
_registrationId = message;
}
}
Any help would be greatly appriciated as I have been stuck on this now for days! I know this is a lot of code to paste up here but it is all relevant.
Thanks,
EDIT: The SubscribeToService() method is called when the user logs in and authenticates with the WebAPI. The method is here;
public async Task<User> SendSubmitLogonAsync(LogonObject lo)
{
_logonObject = lo;
using (var client = GetNewHttpClient(false))
{
var logonString = String.Format("grant_type=password&username={0}&password={1}", lo.username, lo.password);
var sc = new StringContent(logonString, Encoding.UTF8);
var response = await client.PostAsync("Token", sc);
if (response.IsSuccessStatusCode)
{
_logonResponse = await response.Content.ReadAsAsync<TokenResponseModel>();
var userInfo = await GetUserInfoAsync();
if (_channel == null)
SubscribeToService();
else
await RegisterForMessageNotificationsAsync();
return userInfo;
}
// ...
}
}
I have solved the issue. There are tons of fairly poorly organised howto's for azure notification hubs and only one of them has this note toward the bottom;
NOTE:
You will not receive the notification when you are still in the app.
To receive a toast notification while the app is active, you must
handle the ShellToastNotificationReceived event.
This is why I was experiencing intermittent results, as i assumed you would still get a notification if you were in the app. And this little note is pretty well hidden.
Have you used proper tag / tag expressions while register/send the message. Also, Where are you storing the id back from the notification hub. It should be used when you update the channel uri (it will expire).
I would suggest to start from scratch.
Ref: http://msdn.microsoft.com/en-us/library/dn530749.aspx