enter image description hereI have created REST API in ASP.NET with http://server/token as URL.
The header having
content-type: application/x-www-form-urlencode
The body have grant_type as password, username and password will get json data with token.
For further data access token can be used above method works with postman
I need to implement a client in Android Studio or Xamarin.
as urls in postman is "example.com/token"; , then in Header Key value pais for content type as ("Content-Type:application/x-www-form-urlencoded) and in body key value pair as (grant_type:password, username:email,password:pass) and after send the response is in json format as follows { "access_token": "token", "token_type": "bearer", "expires_in": 1209599, "userName": "mail#gmail.com", ".issued": "Fri, 09 Dec 2016 19:19:18 GMT", ".expires": "Fri, 23 Dec 2016 19:19:18 GMT" }
this same needed to be done in android
Include in your dependencies System.Net.Http (requires Xamarin profile 111) and then you can use that to create a HttpClient and request the token via HTTP POST (akin to what you were doing in Postman) like this..
_client = new HttpClient();
var uri = new Uri("http://server/token");
var content = new FormUrlEncodedContent(
new List<KeyValuePair<string, string>> {
new KeyValuePair<string, string>("username", _username),
new KeyValuePair<string, string>("password", _password),
new KeyValuePair<string, string>("grant_type", "password")
});
HttpResponseMessage response = await _client.PostAsync(uri, content);
Where _username and _password are strings.
Then read the response out by converting it into a Dictionary or any other reasonable alternative approach to parsing the JSON response.
if (response.StatusCode == HttpStatusCode.OK) {
var jsonContent = await response.Content.ReadAsStringAsync();
var responseDict = JsonConvert.DeserializeObject<Dictionary<string, string>>(jsonContent);
if (responseDict.ContainsKey("access_token"))
_token = responseDict["access_token"];
}
Then once you have the token, you can include it as a default authorization value for all headers from that HttpClient instance!
_client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", _token);
Where _token is the token as it's encoded string, e.g. "eyJ0eXAiOiJKV1QiLC..."
Just implemented this and to verify it's correctness - I ran it against a production environment I have set up to verify using JWTs and it worked a charm.
this works, it looks ugly but you can change it
var authCredentials = "grant_type=password&username=" + WebUtility.UrlEncode(LoginBindingModel.Email) + "&password=" + LoginBindingModel.Password;
string response = await Client.MakePostFormRequest("token", authCredentials);
public static async Task<string> MakePostFormRequest(string url, string data)
{
try
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(BaseUrl + "token");
// Set the Method property of the request to POST.
request.Accept = "*/*";
request.Method = "POST";
// Create POST data and convert it to a byte array.
byte[] byteArray = Encoding.UTF8.GetBytes(data);
// Set the ContentType property of the WebRequest.
request.ContentType = "application/x-www-form-urlencoded";
// Set the ContentLength property of the WebRequest.
//request.ContentLength = byteArray.Length;
// Get the request stream.
Stream dataStream = await request.GetRequestStreamAsync().ConfigureAwait(false);
// Write the data to the request stream.
dataStream.Write(byteArray, 0, byteArray.Length);
// Close the Stream object.
dataStream.Dispose();
// Get the response.
WebResponse response = await request.GetResponseAsync().ConfigureAwait(false);
// Display the status.
//Console.WriteLine(((HttpWebResponse)response).StatusDescription);
// Get the stream containing content returned by the server.
dataStream = response.GetResponseStream();
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader(dataStream);
// Read the content.
string responseFromServer = reader.ReadToEnd();
// Display the content.
//Console.WriteLine(responseFromServer);
// Clean up the streams.
TokenViewModel TokenViewModel = JsonConvert.DeserializeObject<TokenViewModel >(responseFromServer);
VariablesGlobales.Token = TokenViewModel.access_token;
VariablesGlobales.LoginStamp = TokenViewModel.LoginStamp;
reader.Dispose();
dataStream.Dispose();
response.Dispose();
return responseFromServer;
}
catch (Exception ex)
{
return "";
}
}
And when you want to authenticate your request
public static async Task<string> MakePostRequest(string url, string data)
{
var result = "";
try
{
var httpWebRequest = (HttpWebRequest)WebRequest.Create(BaseUrl + url);
httpWebRequest.ContentType = "application/json; charset=utf-8";
httpWebRequest.Method = "POST";
if (VariablesGlobales.Token != "")
{
httpWebRequest.Headers[HttpRequestHeader.Authorization] = "Bearer " + VariablesGlobales.Token;
}
using (var streamWriter = new StreamWriter(await httpWebRequest.GetRequestStreamAsync().ConfigureAwait(false)))
{
streamWriter.Write(data);
streamWriter.Flush();
}
var httpResponse = (HttpWebResponse)(await httpWebRequest.GetResponseAsync().ConfigureAwait(false));
if (httpResponse.StatusCode.ToString() == "OK")
{
result = httpResponse.StatusCode.ToString();
}
else
{
result = "";
}
}
catch (Exception ex)
{
result = "";
}
return result;
}
}
Related
I'm trying to convert my Android post request to iOS (Swift). Currently, this is the Android code:
JSONObject json = new JSONObject();
json.put("major", Major);
json.put("minor", Minor);
json.put("uuid", UUID);
json.put("userid", id);
int TIMEOUT_MILLISEC = 10000; // = 10 seconds
HttpParams httpParams = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpParams, TIMEOUT_MILLISEC);
HttpConnectionParams.setSoTimeout(httpParams, TIMEOUT_MILLISEC);
HttpClient client = new DefaultHttpClient(httpParams);
HttpPost request = new HttpPost("http://" + ipAddress + ":8080/");
request.setHeader("Content-Type", "application/json");
request.setEntity(new ByteArrayEntity(
json.toString().getBytes("UTF8")));
HttpResponse response = client.execute(request);
This works perfectly fine.
However, when I try to convert it to Swift, the server doesn't receive anything even though I know that it's executing the request.
Swift:
var request = NSMutableURLRequest(URL: NSURL(string: URLString)!)
var session = NSURLSession.sharedSession()
request.HTTPMethod = "POST"
var params = ["major": "1", "minor": "2", "uuid": "00000000-1111-2222-3333-444444444444", "userid": "3"] as Dictionary<String, String>
request.HTTPBody = try! NSJSONSerialization.dataWithJSONObject(params, options: [])
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
let task = session.dataTaskWithRequest(request) { data, response, error in
guard data != nil else {
print("no data found: \(error)")
return
}
do {
if let json = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary {
let success = json["success"] as? Int
} else {
let jsonStr = NSString(data: data!, encoding: NSUTF8StringEncoding)
}
} catch let parseError {
let jsonStr = NSString(data: data!, encoding: NSUTF8StringEncoding)
}
}
Any help or direction would be nice. Thanks.
Edit 1: A task.resume() got me a response from the server. However, if anyone knows how to convert "request.setEntity(new ByteArrayEntity(json.toString().getBytes("UTF8")));" in Swift, that would be really helpful.
#Naga Krishnamraju
For your second concern where need to parse json string to object you can do that using following way
if(response != nil)
{
// Print out reponse body
let responseString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
//print("****** response data = \(responseString!)")
do {
let json = try JSONSerialization.jsonObject(with: data!, options: []) as? NSDictionary
print(json ?? "Error")
print("responseString :-%#",responseString ?? "error");
DispatchQueue.main.async {
if((json?.count)! > 0)
{
//here you get json as dictionary now you can have your implementation
}
}
}catch
{
print(error)
failure(error as NSError);
}
}
Did you forget to add task.resume ?
task.resume() after block will do the job
I am working at the REST API for a new Social Network Android App at the moment using Spring Android for the Client and Spring Boot for the Server.
I am having trouble securing the Server using Spring Security, because i don't understand how to use it properly. After reading tons of sample apps i gave up on spring security and found this tutorial on how to secure APIs using Jersey.
Instead of javascript i am using the Jersey Client API to test the implementation
Client client = ClientBuilder.newClient();
WebTarget target = client.target("http://localhost:8080/demo-business-resource/login");
Invocation.Builder invoBuilder = target.request();
invoBuilder.header("service_key", "3b91cab8-926f-49b6-ba00-920bcf934c2a");
MultivaluedMap formData = new MultivaluedMapImpl();
formData.add("username", "username2");
formData.add( "password", "passwordForUser2");
Response response = invoBuilder.post(Entity.form(formData));
System.out.println(response);
response.getEntity();
The POST request is successful, but i cant get the JSON object which should be the Entity of the Response. response.getEntity(); returns a HttpUrlConnector Object.
Here the related Server Code
#POST
#Path( "login" )
#Produces( MediaType.APPLICATION_JSON )
public Response login(
#Context HttpHeaders httpHeaders,
#FormParam( "username" ) String username,
#FormParam( "password" ) String password ) {
DemoAuthenticator demoAuthenticator = DemoAuthenticator.getInstance();
String serviceKey = httpHeaders.getHeaderString( DemoHTTPHeaderNames.SERVICE_KEY );
try {
String authToken = demoAuthenticator.login( serviceKey, username, password );
JsonObjectBuilder jsonObjBuilder = Json.createObjectBuilder();
jsonObjBuilder.add( "auth_token", authToken );
JsonObject jsonObj = jsonObjBuilder.build();
return getNoCacheResponseBuilder( Response.Status.OK ).entity( jsonObj.toString() ).build();
} catch ( final LoginException ex ) {
JsonObjectBuilder jsonObjBuilder = Json.createObjectBuilder();
jsonObjBuilder.add( "message", "Problem matching service key, username and password" );
JsonObject jsonObj = jsonObjBuilder.build();
return getNoCacheResponseBuilder( Response.Status.UNAUTHORIZED ).entity( jsonObj.toString() ).build();
}
}
private Response.ResponseBuilder getNoCacheResponseBuilder( Response.Status status ) {
CacheControl cc = new CacheControl();
cc.setNoCache( true );
cc.setMaxAge( -1 );
cc.setMustRevalidate( true );
return Response.status( status ).cacheControl( cc );
}
I am new to Jersey and i only want to use it to generate the Authentication Token, because i get 404 Not Found errors using Spring. (I am working with spring-jersery )
Here my Spring approach of the client
RestTemplate template = new RestTemplate();
MultiValueMap<String, String> params = new LinkedMultiValueMap<String, String>();
params.add("service_key", "3b91cab8-926f-49b6-ba00-920bcf934c2a");
MultiValueMap<String,String> formData=new LinkedMultiValueMap<String,String>();
formData.add("username", "username2");
formData.add( "password", "passwordForUser2");
Model_LoginProfile log = new Model_LoginProfile();
log.setLoginName("username2");
log.setPassword("passwordForUser2");
HttpHeaders requestHeaders=new HttpHeaders();
requestHeaders.setContentType(MediaType.APPLICATION_JSON);
requestHeaders.set("service_key", "3b91cab8-926f-49b6-ba00-920bcf934c2a");
HttpEntity<Model_LoginProfile> requestEntity = new HttpEntity<Model_LoginProfile>(log, requestHeaders);
ResponseEntity<String> result = template.postForEntity("http://localhost:8080/demo-business-resource/login", requestEntity, String.class);
}
Maybe someone has a fix for that as well. :)
Thanks in advance
I'm using a REST API to access PassSlot in an attempt to generate a pass / coupon. It seems that when i run the program i get the error: "Error: NameResolutionFailure".
I have:
public static async Task<string> SendAndReceiveJsonRequest()
{
string responseStr = null;
string uri = "https://api.passslot.com/v1/templates/my-template-ID/pass";
// Create a json string with a single key/value pair.
var json = new JObject (new JProperty ("lastName", lastName),
new JProperty ("firstName", firstName),
new JProperty ("percentOff", percentOff),
new JProperty ("offerDescription", offerDescription),
new JProperty ("entityName", entityName),
new JProperty ("expiry", expiry));
//Console.WriteLine ("Jake's JSON " + json.ToString ());
using (var httpClient = new HttpClient ())
{
httpClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("My-Key-Here-xxx-xxx-xxx");
//create the http request content
HttpContent content = new StringContent(json.ToString());
try
{
// Send the json to the server using POST
Task<HttpResponseMessage> getResponse = httpClient.PostAsync(uri, content);
// Wait for the response and read it to a string var
HttpResponseMessage response = await getResponse;
responseStr = await response.Content.ReadAsStringAsync();
}
catch (Exception e)
{
Console.WriteLine("Error communicating with the server: " + e.Message);
}
}
return responseStr;
}
I'm running this on Android 4.4 via a Nexus 4. I'm on 3G (not wifi).
Any hints as to what might be happening here and why i'm getting the error.
In case the url request is in local network, Check if you url ip is set in the hosts device (the hosts setting of the smartphone, tablet, whatever you are using to test)
PD.
To edit the hosts setting device in android you may use this app
https://play.google.com/store/apps/details?id=com.nilhcem.hostseditor
Iam sending a POST request from my android app using Xamarin. Iam using HttpClient to make the request
Things I have done:
1) Specified Internet permission
2) Tested the request from Postman for google Chrome
3) Debugged the code step by step
Problem:
1) I get the response as null.
2) Found the issue might be while receiving the response.
Here is my code:-
var resultString = String.Empty;
var registerContent = new StringBuilder();
registerContent.Append("DeviceId=");
registerContent.Append(deviceId);
registerContent.Append("&");
registerContent.Append("Name=");
registerContent.Append(deviceName);
registerContent.Append("&");
registerContent.Append("EncodedAccountName=");
registerContent.Append(username);
var client = DataClient.Instance;
var request = new HttpRequestMessage(HttpMethod.Post,new Uri(EndPoints.RegisterDeviceEndPoint, UriKind.Absolute))
{
Content = new StringContent("DeviceId=" + deviceId + "&Name=" + deviceName + "&EncodedAccountName=" + username)
};
request.Content.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded");
var result = await client.SendAsync(request);
if (result.StatusCode == HttpStatusCode.OK)
{
resultString = HostUrl.GeAuthorizationtResult(result.Content.ReadAsStringAsync().Result);
}
return resultString;
Any help is appreciated
Thanks
It looks like you have a lot of app-specific code in there, so it's difficult to say what's causing the issue. You can simplify your code by using HttpClient's built-in support for form posts.
var httpClient = new HttpClient();
var values = new List<KeyValuePair<string, string>>
{
new KeyValuePair<string, string>("DeviceId", deviceId),
new KeyValuePair<string, string>("Name", deviceName),
new KeyValuePair<string, string>("EncodedAccountName", username)
};
var response = await httpClient.PostAsync(requestUrl, new FormUrlEncodedContent(values));
response.EnsureSuccessStatusCode();
var resultString = await response.Content.ReadAsStringAsync();
Try this and see if it solves the issue. Otherwise, you'll need to expand on what HostUrl.GeAuthorizationtResult() does.
I have seen this question posted in a thousand places and I have tried all the solutions that have worked for others but I am not able to get this to work for me. I used this post as my baseline for the project that Im using (Unauthorized when calling Google GCM). I have tried both the API key and the browser key with no success.
Here is my code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Web;
using System.Net;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.IO;
namespace GCMTest
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string BrowserAPIKey = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
string message = "some test message";
string tickerText = "example test GCM";
string contentTitle = "content title GCM";
string postData = "{ \"registration_ids\": [ \"" + txtRegistrationID.Text + "\" ], \"data\": {\"tickerText\":\"" + tickerText + "\", \"contentTitle\":\"" + contentTitle + "\", \"message\": \"" + message + "\"}}";
string response = SendGCMNotification(BrowserAPIKey, postData);
}
private string SendGCMNotification(string apiKey, string postData, string postDataContentType = "application/json")
{
// from here:
// https://stackoverflow.com/questions/11431261/unauthorized-when-calling-google-gcm
//
// original:
// http://www.codeproject.com/Articles/339162/Android-push-notification-implementation-using-ASP
ServicePointManager.ServerCertificateValidationCallback += new RemoteCertificateValidationCallback(ValidateServerCertificate);
//
// MESSAGE CONTENT
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
//
// CREATE REQUEST
HttpWebRequest Request = (HttpWebRequest)WebRequest.Create("https://android.googleapis.com/gcm/send");
Request.Method = "POST";
Request.KeepAlive = false;
Request.ContentType = postDataContentType;
//Request.Headers.Add(string.Format("Authorization: key={0}", apiKey));
Request.Headers.Add(HttpRequestHeader.Authorization, String.Format("key={0}", apiKey));
Request.ContentLength = byteArray.Length;
//Stream dataStream;
try
{
Stream dataStream = Request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();
}
catch (Exception e)
{
MessageBox.Show(e.Message);
}
//
// SEND MESSAGE
try
{
WebResponse Response = Request.GetResponse();
HttpStatusCode ResponseCode = ((HttpWebResponse)Response).StatusCode;
if (ResponseCode.Equals(HttpStatusCode.Unauthorized) || ResponseCode.Equals(HttpStatusCode.Forbidden))
{
MessageBox.Show("Unauthorized - need new token");
}
else if (!ResponseCode.Equals(HttpStatusCode.OK))
{
MessageBox.Show("Response from web service isn't OK");
}
StreamReader Reader = new StreamReader(Response.GetResponseStream());
string responseLine = Reader.ReadToEnd();
Reader.Close();
return responseLine;
}
catch (Exception e)
{
MessageBox.Show(e.Message);
}
return "error";
}
public static bool ValidateServerCertificate(
object sender,
X509Certificate certificate,
X509Chain chain,
SslPolicyErrors sslPolicyErrors)
{
return true;
}
}
}
Its erring on this line:
WebResponse Response = Request.GetResponse();
With the following message:
"The remote server returned an error: (401) Unauthorized."
The form allows an input of a device registration id. If I can get this working it will be altered to be more usable in a production environment. The application is running on my local machine right now but will ultimately reside on a remote server.
Any help that I can get would be GREATLY appreciated. I have been reading posts about this for a week now and I haven't been able to make any progress. One thing that I think might be causing this problem is the fact that Im running this locally instead of on the server. Does this request need to come from the address that is listed in the "referer" in the browser key?
Thanks again!
If you are using a Browser Key, you should remove the allowed referrers of that key, so that it would say Any referrer is allowed. This would allow you to send the notifications from a locally run server.
Otherwise, you'll be able to send GCM messages using that Browser Key only from Web Sites that have the domain specified in allowed referrers.
Check on the console (console.developers.google.com) if the API "Google Cloud Messaging for Android" is active.
I had the same problem, I thought it was active and wasn't