chat room persistent db model

src/Yavsc/Helpers/ExternalAuthStoreHelper.cs

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+using System;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.Data.Entity;
+using Newtonsoft.Json.Linq;
+
+namespace Yavsc.Helpers.Auth
+{
+    using Yavsc.Models;
+    using Yavsc.Models.Auth;
+    public static class ExternalAuthStoreHelper {
+
+        public static Task<OAuth2Tokens> GetTokensAsync(this ApplicationDbContext context, string externalUserId)
+        {
+            if (string.IsNullOrEmpty(externalUserId))
+            {
+                throw new ArgumentException("externalUserId MUST have a value");
+            }
+
+            var item = context.OAuth2Tokens.FirstOrDefault(x => x.UserId == externalUserId);
+            // TODO Refresh token
+
+            return Task.FromResult(item);
+        }
+
+        public static Task StoreTokenAsync(this ApplicationDbContext context, string externalUserId, JObject response, string accessToken,
+        string tokenType, string refreshToken, string expiresIn
+        )
+        {
+            if (string.IsNullOrEmpty(externalUserId))
+            {
+                throw new ArgumentException("googleUserId MUST have a value");
+            }
+
+            var item = context.OAuth2Tokens.SingleOrDefaultAsync(x => x.UserId == externalUserId).Result;
+            if (item == null)
+            {
+                context.OAuth2Tokens.Add(new OAuth2Tokens
+                {
+                    TokenType = "Bearer",
+                    AccessToken = accessToken,
+                    RefreshToken = refreshToken,
+                    Expiration = DateTime.Now.AddSeconds(int.Parse(expiresIn)),
+                    UserId = externalUserId
+                });
+            }
+            else
+            {
+                item.AccessToken = accessToken;
+                item.Expiration = DateTime.Now.AddMinutes(int.Parse(expiresIn));
+                if (refreshToken != null)
+                    item.RefreshToken = refreshToken;
+                context.OAuth2Tokens.Update(item);
+            }
+            context.SaveChanges(externalUserId);
+            return Task.FromResult(0);
+        }
+  }
+}