Initial commit

FarmmapsApi/Services/OpenIdConnectService.cs

@@ -0,0 +1,54 @@
+using System;
+using System.Net.Http;
+using System.Threading.Tasks;
+using FarmmapsApi.Models;
+using IdentityModel.Client;
+
+namespace FarmmapsApi.Services
+{
+    public class OpenIdConnectService
+    {
+        private readonly IDiscoveryCache _discoveryCache;
+        private readonly Configuration _configuration;
+        private readonly HttpClient _httpClient;
+
+        public OpenIdConnectService(IDiscoveryCache discoveryCache, 
+            IHttpClientFactory httpFactory, Configuration configuration)
+        {
+            _discoveryCache = discoveryCache;
+            _configuration = configuration;
+            _httpClient = httpFactory.CreateClient();
+        }
+
+        public async Task<DiscoveryDocumentResponse> GetDiscoveryDocumentAsync()
+        {
+            var disco = await _discoveryCache.GetAsync();
+            if (disco.IsError)
+                throw new Exception(disco.Error);
+
+            return disco;
+        }
+
+        public async Task<TokenResponse> GetTokenClientCredentialsAsync(string tokenEndpointUrl, string clientId, string clientSecret)
+        {
+            return await _httpClient.RequestClientCredentialsTokenAsync(new ClientCredentialsTokenRequest()
+            {
+                Address = tokenEndpointUrl,
+                ClientId = clientId,
+                ClientSecret = clientSecret,
+                Scope = string.Join(" ", _configuration.Scopes)
+            });
+        }
+
+        public async Task<TokenResponse> RefreshTokensAsync(string tokenEndpointUrl, string refreshToken)
+        {
+            return await _httpClient.RequestRefreshTokenAsync(new RefreshTokenRequest()
+            {
+                Address = tokenEndpointUrl,
+                ClientId = _configuration.ClientId,
+                ClientSecret = _configuration.ClientSecret,
+                RefreshToken = refreshToken
+            });
+        }
+    }
+}