Shared Max Age support added.

Optional parameter to specify the "s-maxage" header.

Fixes filipw#186

Author: bobend

src/WebApi.OutputCache.Core/Time/CacheTime.cs

@@ -7,6 +7,8 @@ public class CacheTime
         // client cache length in seconds
         public TimeSpan ClientTimeSpan { get; set; }
 
+        public TimeSpan? SharedTimeSpan { get; set; }
+
         public DateTimeOffset AbsoluteExpiration { get; set; }
     }
 }

src/WebApi.OutputCache.Core/Time/ShortTime.cs

@@ -6,8 +6,9 @@ public class ShortTime : IModelQuery<DateTime, CacheTime>
     {
         private readonly int serverTimeInSeconds;
         private readonly int clientTimeInSeconds;
+        private readonly int? sharedTimeInSecounds;
 
-        public ShortTime(int serverTimeInSeconds, int clientTimeInSeconds)
+        public ShortTime(int serverTimeInSeconds, int clientTimeInSeconds, int? sharedTimeInSecounds)
         {
             if (serverTimeInSeconds < 0)
                 serverTimeInSeconds = 0;
@@ -18,14 +19,20 @@ public ShortTime(int serverTimeInSeconds, int clientTimeInSeconds)
                 clientTimeInSeconds = 0;
 
             this.clientTimeInSeconds = clientTimeInSeconds;
+
+            if (sharedTimeInSecounds.HasValue && sharedTimeInSecounds.Value < 0)
+                sharedTimeInSecounds = 0;
+
+            this.sharedTimeInSecounds = sharedTimeInSecounds;
         }
 
         public CacheTime Execute(DateTime model)
         {
             var cacheTime = new CacheTime
                 {
                     AbsoluteExpiration = model.AddSeconds(serverTimeInSeconds),
-                    ClientTimeSpan = TimeSpan.FromSeconds(clientTimeInSeconds)
+                    ClientTimeSpan = TimeSpan.FromSeconds(clientTimeInSeconds),
+                    SharedTimeSpan = sharedTimeInSecounds.HasValue ? (TimeSpan?) TimeSpan.FromSeconds(sharedTimeInSecounds.Value) : null
                 };
 
             return cacheTime;

src/WebApi.OutputCache.V2/CacheOutputAttribute.cs

@@ -5,6 +5,7 @@
 using System.Net.Http.Formatting;
 using System.Net.Http.Headers;
 using System.Runtime.ExceptionServices;
+using System.Runtime.InteropServices;
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
@@ -48,6 +49,23 @@ public class CacheOutputAttribute : ActionFilterAttribute
         /// </summary>
         public int ClientTimeSpan { get; set; }
 
+
+        private int? _sharedTimeSpan = null;
+
+        /// <summary>
+        /// Corresponds to CacheControl Shared MaxAge HTTP header (in seconds)
+        /// </summary>
+        public int SharedTimeSpan
+        {
+            get // required for property visibility
+            {
+                if (!_sharedTimeSpan.HasValue)
+                    throw new Exception("should not be called without value set"); 
+                return _sharedTimeSpan.Value;
+            }
+            set { _sharedTimeSpan = value; }
+        }
+
         /// <summary>
         /// Corresponds to CacheControl NoCache HTTP header
         /// </summary>
@@ -98,7 +116,7 @@ protected virtual void EnsureCacheTimeQuery()
 
         protected void ResetCacheTimeQuery()
         {
-            CacheTimeQuery = new ShortTime( ServerTimeSpan, ClientTimeSpan );
+            CacheTimeQuery = new ShortTime( ServerTimeSpan, ClientTimeSpan, _sharedTimeSpan);
         }
 
         protected virtual MediaTypeHeaderValue GetExpectedMediaType(HttpConfiguration config, HttpActionContext actionContext)
@@ -247,6 +265,7 @@ protected virtual void ApplyCacheHeaders(HttpResponseMessage response, CacheTime
                 var cachecontrol = new CacheControlHeaderValue
                                        {
                                            MaxAge = cacheTime.ClientTimeSpan,
+                                           SharedMaxAge = cacheTime.SharedTimeSpan,
                                            MustRevalidate = MustRevalidate,
                                            Private = Private
                                        };

test/WebApi.OutputCache.V2.Tests/ClientSideTests.cs

@@ -178,6 +178,22 @@ public void private_true_headers_correct()
             Assert.IsTrue(result.Headers.CacheControl.Private);
         }
 
+        [Test]
+        public void shared_max_age_header_correct()
+        {
+            var client = new HttpClient(_server);
+            var result = client.GetAsync(_url + "Get_c100_s100_sm200").Result;
+            Assert.AreEqual(result.Headers.CacheControl.SharedMaxAge,TimeSpan.FromSeconds(200));
+        }
+
+        [Test]
+        public void shared_max_age_header_not_present()
+        {
+            var client = new HttpClient(_server);
+            var result = client.GetAsync(_url + "Get_c100_s100").Result;
+            Assert.AreEqual(result.Headers.CacheControl.SharedMaxAge, null);
+        }
+
         [TestFixtureTearDown]
         public void fixture_dispose()
         {

test/WebApi.OutputCache.V2.Tests/TestControllers/SampleController.cs

@@ -152,5 +152,12 @@ public IHttpActionResult Get_ihttpactionresult()
         {
             return Ok("value");
         }
+
+        [CacheOutput(ClientTimeSpan = 100, ServerTimeSpan = 100, SharedTimeSpan = 200)]
+        public string Get_c100_s100_sm200()
+        {
+            return "test";
+        }
+
     }
 }