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@lewixlabs
Last active Nov 19, 2018
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Xamarin OAuth2 Custom Class to get & use refresh_token
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Xamarin.Auth;
namespace MyNetStandardLibrary.OAuth2
{
// inspired by https://lostechies.com/jimmybogard/2014/11/13/mobile-authentication-with-xamarin-auth-and-refresh-tokens/
public class CustomOAuth2Authenticator : OAuth2Authenticator
{
public CustomOAuth2Authenticator(string clientId, string scope, Uri authorizeUrl, Uri redirectUrl, GetUsernameAsyncFunc getUsernameAsync = null, bool isUsingNativeUI = false) : base(clientId, scope, authorizeUrl, redirectUrl, getUsernameAsync, isUsingNativeUI)
{
}
public CustomOAuth2Authenticator(string clientId, string clientSecret, string scope, Uri authorizeUrl, Uri redirectUrl, Uri accessTokenUrl, GetUsernameAsyncFunc getUsernameAsync = null, bool isUsingNativeUI = false) : base(clientId, clientSecret, scope, authorizeUrl, redirectUrl, accessTokenUrl, getUsernameAsync, isUsingNativeUI)
{
}
async public override Task<Uri> GetInitialUrlAsync(Dictionary<string, string> custom_query_parameters = null)
{
var initilUrl = await base.GetInitialUrlAsync(custom_query_parameters);
return new Uri($"{initilUrl}&access_type=offline");
}
async public Task<Dictionary<string,string>> RequestValidAccessTokenAsync(string refreshToken)
{
var queryValues = new Dictionary<string, string>
{
{"refresh_token", refreshToken},
{"client_id", this.ClientId},
{"grant_type", "refresh_token"}
};
if (!string.IsNullOrEmpty(this.ClientSecret))
queryValues["client_secret"] = this.ClientSecret;
var accountProperties = await this.RequestAccessTokenAsync(queryValues);
this.OnRetrievedAccountProperties(accountProperties);
return new Dictionary<string,string>(accountProperties);
//return this.RequestAccessTokenAsync(queryValues).ContinueWith(result =>
//{
// var accountProperties = result.Result;
// this.OnRetrievedAccountProperties(accountProperties);
// return int.Parse(accountProperties["expires_in"]);
//});
}
}
}
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