Hello i'm doing an xamarin.form application and i'm implementing the twitter login using oauth.
I have problem to get the request_token folowing the link:
https://dev.twitter.com/oauth/reference/post/oauth/request_token
using restsharp.portable for the request POST i arrive at this point:
public async void GetTwitterToken()
{
try
{
TwitterLogin tw = new TwitterLogin();
RestClient client = new RestClient("https://api.twitter.com");
RestRequest request = new RestRequest("/oauth/request_token", Method.POST);
client.Authenticator = OAuth1Authenticator.ForRequestToken(tw.oauth_consumer_key, tw.oauth_consumer_secret);
IRestResponse response = await client.Execute(request);
}
catch (Exception e)
{
}
}
Parameter "response" it's ok but i'don't know how to parse to get token (it's not json).
i have seen this example:
public void GetRequestToken()
{
var client = new RestClient("https://api.twitter.com"); // Note NO /1
client.Authenticator = OAuth1Authenticator.ForRequestToken(
_consumerKey,
_consumerSecret,
"http://markashleybell.com" // Value for the oauth_callback parameter
);
var request = new RestRequest("/oauth/request_token", Method.POST);
var response = client.Execute(request);
var qs = HttpUtility.ParseQueryString(response.Content);
_token = qs["oauth_token"];
_tokenSecret = qs["oauth_token_secret"];
}
But i don't have HttpUtility.ParseQueryString(response.Content) whith xamarin.form framework
Related
Hi I am just learning Xamarin android development and I just want to CRUD operation but I am stuck that I am unable to get any response from webapi. I have tested my api using SOAPUI and response is ok from that.
[HttpPost]
public HttpResponseMessage CreateEmpAttandance(string value)
{
if (value != "1234")
{
string json = #"{ data: 'Emp Code is not valid.'}";
var jObject = JObject.Parse(json);
var response = Request.CreateResponse(HttpStatusCode.OK);
response.Content = new StringContent(jObject.ToString(), System.Text.Encoding.UTF8, "application/json");
return response;
}
else
{
string json = #"{ data: 'data save sucessfully.'}";
var jObject = JObject.Parse(json);
var response = Request.CreateResponse(HttpStatusCode.OK);
response.Content = new StringContent(jObject.ToString(), System.Text.Encoding.UTF8, "application/json");
return response;
}
}
this is api code and below is my android application code but I am getting null response exception.
public async Task SaveTodoItemAsync(string EmpCode)
{
try
{
string url = "http://192.168.1.9/attandanceapi/api/attandance?value=12132";
var uri = new Uri(string.Format(url));
var json = JsonConvert.SerializeObject(EmpCode);
var content = new StringContent(EmpCode, Encoding.UTF8, "application/json");
HttpResponseMessage response = null;
response = await client.PostAsync(url, content);
var responses = response;
}
catch (Exception ex)
{
var w = ex.ToString();
}
}
I think we have problem here. You are trying to create content from string not from Json.
var content = new StringContent(EmpCode, Encoding.UTF8, "application/json");
try this:
var content = new StringContent(json, Encoding.UTF8, "application/json");
Edit:
I cannot see your default headers so if you don't have them - just add.
client.DefaultRequestHeaders.Add("Accept", "application/json");
I have paypal integration application which receives webhook notification from paypal and I want to verify the signature as per docs:
Verify signature rest api link
Here is code which I have written:
public async Task<ActionResult> Index()
{
var stream = this.Request.InputStream;
var requestheaders = HttpContext.Request.Headers;
var reader = new StreamReader(stream);
var jsonReader = new JsonTextReader(reader);
var serializer = new JsonSerializer();
var webhook = serializer.Deserialize<Models.Event>(jsonReader);
var webhookSignature = new WebhookSignature();
webhookSignature.TransmissionId = requestheaders["PAYPAL-TRANSMISSION-ID"];
webhookSignature.TransmissionTime = requestheaders["PAYPAL-TRANSMISSION-TIME"];
webhookSignature.TransmissionSig = requestheaders["PAYPAL-TRANSMISSION-SIG"];
webhookSignature.WebhookId = "My actual webhookid from paypal account";
webhookSignature.CertUrl = requestheaders["PAYPAL-CERT-URL"];
webhookSignature.AuthAlgo = requestheaders["PAYPAL-AUTH-ALGO"];
webhookSignature.WebhookEvent = webhook;
var jsonStr2 = JsonConvert.SerializeObject(webhookSignature);
var result = await _webhookService.VerifyWebhookSignatureAsync(webhookSignature);
var jsonStr3 = JsonConvert.SerializeObject(result);
return Content(jsonStr3, "application/json");
}
public async Task<Models.SignatureResponse> VerifyWebhookSignatureAsync(Models.WebhookSignature webhook, CancellationToken cancellationToken = default(CancellationToken))
{
var accessTokenDetails = await this.CreateAccessTokenAsync();
_httpClient.DefaultRequestHeaders.Add("Authorization", "Bearer " + accessTokenDetails.AccessToken);
try
{
string jsonStr = JsonConvert.SerializeObject(webhook);
var content = new StringContent(jsonStr, Encoding.UTF8, "application/json");
string url = $"{_baseUrl}notifications/verify-webhook-signature";
var response = await _httpClient.PostAsync(url, content);
if (!response.IsSuccessStatusCode)
{
var error = await response.Content.ReadAsStringAsync();
throw new Exception(error);
}
string jsonContent = response.Content.ReadAsStringAsync().Result;
return JsonConvert.DeserializeObject<Models.SignatureResponse>(jsonContent);
}
catch (Exception ex)
{
throw new InvalidOperationException("Request to Create payment Service failed.", ex);
}
}
Webhook signature verification response :
{"verification_status":"FAILURE"}
I am getting 200K ok response from api but verification status in response is always FAILURE.I tried many different request.
I am not sure if something is wrong from my request. Looking for help.
I have an APIController Method as below. Basically I need to validate an API response. So it's an API call within an API call.
public class DCController : ApiController
{
[HttpPost]
public HttpResponseMessage SampleMethod(string url)
{
var uri = new Uri(url);
var baseAddress = uri.GetLeftPart(System.UriPartial.Authority);
var apiAddress = url.Replace(baseAddress + "/", "");
var responseString = string.Empty;
using (var client = new HttpClient())
{
client.BaseAddress = new Uri(baseAddress);
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
var response = client.GetAsync(apiAddress).Result;
if (response.IsSuccessStatusCode)
{
responseString = response.Content.ReadAsStringAsync().Result;
}
}
if (!string.IsNullOrEmpty(responseString) && responseString.ToString().Validate())
{
return Request.CreateResponse(HttpStatusCode.OK, "Validated");
}
else
{
return Request.CreateErrorResponse(HttpStatusCode.BadRequest, "Invalid");
}
}
Issue:
1. Request object is null in the return lines.
2. If i try creating a request object -
var request = new HttpRequestMessage();
It throws below error:
An exception of type 'System.InvalidOperationException' occurred in
System.Web.Http.dll but was not handled in user code
Additional information: The request does not have an associated
configuration object or the provided configuration was null.
Not sure what settings I need to add. I am relatively new to working with APIs. Any help is appreciated.
I could get it working by below code -
[HttpPost]
public HttpResponseMessage Get(string url)
{
string responseString = GetWebApiData(url); //Extracted the method
HttpResponseMessage response = new HttpResponseMessage();
if (!string.IsNullOrEmpty(responseString) && responseString.ToString().Validate())
{
response.ReasonPhrase = "Valid";
response.StatusCode = HttpStatusCode.OK;
}
else
{
response.ReasonPhrase = "Invalid";
response.StatusCode = HttpStatusCode.BadRequest;
}
return response;
}
I want to send one pre request to my server before send every request. From that pre request I will receive the token from my server and than I have to add that token into all the request. This is the process.
I have try with some methods to achieve this. But I am facing one problem. That is, When I try to send pre request, it is processing with the current request. That mean both request going parallel.
I want to send pre request first and parse the response. After parsing the pre request response only I want to send that another request. But first request not waiting for the pre request response. Please let me any way to send pre request before all the request.
This is my code:
ViewModel:
`public class ListExampleViewModel
{
SecurityToken sToken = null;
public ListExampleViewModel()
{
GlobalConstants.isGetToken = true;
var listResults = REQ_RESP.postAndGetResponse((new ListService().GetList("xx","xxx")));
listResults.Subscribe(x =>
{
Console.WriteLine("\n\n..................................2");
Console.WriteLine("Received Response==>" + x);
});
}
}`
Constant Class for Request and Response:
`public class REQ_RESP
{
private static string receivedAction = "";
private static string receivedPostDate = "";
public static IObservable<string> postAndGetResponse(String postData)
{
if (GlobalConstants.isGetToken)
{
//Pre Request for every reusest
receivedPostDate = postData;
GlobalConstants.isGetToken = false;
getServerTokenMethod();
postData = receivedPostDate;
}
HttpWebRequest serviceRequest =
(HttpWebRequest)WebRequest.Create(new Uri(Constants.SERVICE_URI));
var fetchRequestStream =
Observable.FromAsyncPattern<Stream>(serviceRequest.BeginGetRequestStream,
serviceRequest.EndGetRequestStream);
var fetchResponse =
Observable.FromAsyncPattern<WebResponse>(serviceRequest.BeginGetResponse,
serviceRequest.EndGetResponse);
Func<Stream, IObservable<HttpWebResponse>> postDataAndFetchResponse = st =>
{
using (var writer = new StreamWriter(st) as StreamWriter)
{
writer.Write(postData);
writer.Close();
}
return fetchResponse().Select(rp => (HttpWebResponse)rp);
};
Func<HttpWebResponse, IObservable<string>> fetchResult = rp =>
{
if (rp.StatusCode == HttpStatusCode.OK)
{
using (var reader = new StreamReader(rp.GetResponseStream()))
{
string result = reader.ReadToEnd();
reader.Close();
rp.GetResponseStream().Close();
XDocument xdoc = XDocument.Parse(result);
Console.WriteLine(xdoc);
return Observable.Return<string>(result);
}
}
else
{
var msg = "HttpStatusCode == " + rp.StatusCode.ToString();
var ex = new System.Net.WebException(msg,
WebExceptionStatus.ReceiveFailure);
return Observable.Throw<string>(ex);
}
};
return
from st in fetchRequestStream()
from rp in postDataAndFetchResponse(st)
from str in fetchResult(rp)
select str;
}
public static void getServerTokenMethod()
{
SecurityToken token = new SecurityToken();
var getTokenResults = REQ_RESP.postAndGetResponse((new ServerToken().GetServerToken()));
getTokenResults.Subscribe(x =>
{
ServerToken serverToken = new ServerToken();
ServiceModel sm = new ServiceModel();
//Parsing Response
serverToken = extract(x, sm);
if (!(string.IsNullOrEmpty(sm.NetErrorCode)))
{
MessageBox.Show("Show Error Message");
}
else
{
Console.WriteLine("\n\n..................................1");
Console.WriteLine("\n\nserverToken.token==>" + serverToken.token);
Console.WriteLine("\n\nserverToken.pk==>" + serverToken.pk);
}
},
ex =>
{
MessageBox.Show("Exception = " + ex.Message);
},
() =>
{
Console.WriteLine("End of Process.. Releaseing all Resources used.");
});
}
}`
Here's couple options:
You could replace the Reactive Extensions model with a simpler async/await -model for the web requests using HttpClient (you also need Microsoft.Bcl.Async in WP7). With HttpClient your code would end up looking like this:
Request and Response:
public static async Task<string> postAndGetResponse(String postData)
{
if (GlobalConstants.isGetToken)
{
//Pre Request for every reusest
await getServerTokenMethod();
}
var client = new HttpClient();
var postMessage = new HttpRequestMessage(HttpMethod.Post, new Uri(Constants.SERVICE_URI));
var postResult = await client.SendAsync(postMessage);
var stringResult = await postResult.Content.ReadAsStringAsync();
return stringResult;
}
Viewmodel:
public class ListExampleViewModel
{
SecurityToken sToken = null;
public ListExampleViewModel()
{
GetData();
}
public async void GetData()
{
GlobalConstants.isGetToken = true;
var listResults = await REQ_RESP.postAndGetResponse("postData");
}
}
Another option is, if you want to continue using Reactive Extensions, to look at RX's Concat-method. With it you could chain the token request and the actual web request: https://stackoverflow.com/a/6754558/66988
I am trying to POST parameters through the request, to a service that returns a JSON object. The service works well for android and iOS. I am trying to get this working for wp7. The service requires the content type to be 'application/json' I have pasted the code that sets up the http request below:
var client = new RestClient(baseurl);
var request = new RestRequest();
request.Resource = "login";
request.Method = Method.POST;
request.AddHeader("Accept", "application/json");
request.AddHeader("content-type", "application/json");
request.RequestFormat = DataFormat.Json;
var postData = new Dictionary<string, string>()
{
{"key1",value1},
{"key2",value2}
};
request.AddBody(postData);
client.ExecuteAsync(request, response =>
{
var jsonUser = response.Content;
});
The response error I get from the server is an internal server error. Is anything wrong with the code above. I also tried request.AddParameter method but ended with the same result. The code for that is below:
var client = new RestClient(baseurl);
var request = new RestRequest();
request.Resource = "login";
request.Method = Method.POST;
request.AddHeader("Accept", "application/json");
request.AddHeader("content-type", "application/json");
request.RequestFormat = DataFormat.Json;
var postData = new Dictionary<string, string>()
{
{"key1",value1},
{"key2",value2}
};
var json = JsonConvert.SerializeObject(postData);
request.AddParameter("application/json", json, ParameterType.RequestBody);
client.ExecuteAsync(request, response =>
{
var jsonUser = response.Content;
});
Is there anything that I am doing wrong in either of the cases?