add redis cache demo for cookie session sample

samples/CookieSessionSample/RedisCacheTicketStore.cs

@@ -0,0 +1,76 @@
+using System;
+using System.Security.Cryptography;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.AspNet.Authentication;
+using Microsoft.AspNet.Authentication.Cookies;
+using Microsoft.Extensions.Caching.Distributed;
+using Microsoft.Extensions.Caching.Redis;
+
+namespace CookieSessionSample 
+{
+    public class RedisCacheTicketStore : ITicketStore 
+    {
+        private static readonly char[] _chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890".ToCharArray();
+        private readonly IDistributedCache _cache;
+        private readonly IDataSerializer<AuthenticationTicket> _ticketSerializer = TicketSerializer.Default;
+
+        public RedisCacheTicketStore(RedisCacheOptions options) 
+        {
+            _cache = new RedisCache(options);
+        }
+
+        public async Task<string> StoreAsync(AuthenticationTicket ticket) 
+        {
+            var key = GetUniqueKey();
+            await RenewAsync(key, ticket);
+            return key;
+        }
+
+        public async Task RenewAsync(string key, AuthenticationTicket ticket) 
+        {
+            var options = new DistributedCacheEntryOptions();
+            var expiresUtc = ticket.Properties.ExpiresUtc;
+            if (expiresUtc.HasValue) {
+                options.SetAbsoluteExpiration(expiresUtc.Value);
+            }
+            options.SetSlidingExpiration(TimeSpan.FromHours(1)); // TODO: configurable.
+
+            var data = _ticketSerializer.Serialize(ticket);
+
+            await _cache.SetAsync(key, data, options);
+        }
+
+        public async Task<AuthenticationTicket> RetrieveAsync(string key) 
+        {
+            var data = await _cache.GetAsync(key);
+
+            var ticket = _ticketSerializer.Deserialize(data);
+
+            return ticket;
+        }
+
+        public async Task RemoveAsync(string key) 
+        {
+            await _cache.RemoveAsync(key);
+        }
+
+        private static string GetUniqueKey() 
+        {
+            int maxSize = 8;
+            int size = maxSize;
+            var data = new byte[1];
+            var crypto = new RNGCryptoServiceProvider();
+            crypto.GetNonZeroBytes(data);
+            size = maxSize;
+            data = new byte[size];
+            crypto.GetNonZeroBytes(data);
+            var sb = new StringBuilder(size);
+            foreach (byte b in data) {
+                sb.Append(_chars[b % (_chars.Length - 1)]);
+            }
+
+            return sb.ToString();
+        }
+    }
+}

samples/CookieSessionSample/Startup.cs

@@ -7,6 +7,7 @@
 using Microsoft.AspNetCore.Authentication.Cookies;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Caching.Redis;
 
 namespace CookieSessionSample
 {
@@ -24,7 +25,10 @@ public void Configure(IApplicationBuilder app, ILoggerFactory loggerfactory)
             app.UseCookieAuthentication(new CookieAuthenticationOptions
             {
                 AutomaticAuthenticate = true,
-                SessionStore = new MemoryCacheTicketStore()
+                //SessionStore = new MemoryCacheTicketStore()
+                SessionStore = new RedisTicketStore(new RedisCacheOptions {
+                    Configuration = Configuration["Data:Redis:ConnectionString"],
+                });
             });
 
             app.Run(async context =>

samples/CookieSessionSample/appsettings.json

@@ -0,0 +1,15 @@
+{
+  "Data": {
+    "Redis": {
+      "ConnectionString": "localhost:6379,defaultDatabase=2"
+    }
+  },
+  "Logging": {
+    "IncludeScopes": false,
+    "LogLevel": {
+      "Default": "Verbose",
+      "System": "Information",
+      "Microsoft": "Information"
+    }
+  }
+}

samples/CookieSessionSample/project.json

@@ -6,6 +6,7 @@
     "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0-*",
     "Microsoft.AspNetCore.Server.Kestrel": "1.0.0-*",
     "Microsoft.Extensions.Caching.Memory": "1.0.0-*",
+    "Microsoft.Extensions.Caching.Redis": "1.0.0-*",
     "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0-*",
     "Microsoft.Extensions.Logging.Console": "1.0.0-*"
   },