Add PlaybackGrant (#581)

src/Twilio/JWT/AccessToken/PlaybackGrant.cs

@@ -0,0 +1,41 @@
+using System.Collections.Generic;
+
+namespace Twilio.Jwt.AccessToken
+{
+    /// <summary>
+    /// Grant to expose Twilio Live
+    /// </summary>
+    public class PlaybackGrant : IGrant
+    {
+        /// <summary>
+        /// Grant payload
+        /// </summary>
+        public Dictionary<string, object> Grant { get; set; }
+
+        /// <summary>
+        /// Get the playback grant key
+        /// </summary>
+        ///
+        /// <returns>the playback grant key</returns>
+        public string Key
+        {
+            get
+            {
+                return "player";
+            }
+        }
+
+        /// <summary>
+        /// Get the playback grant payload
+        /// </summary>
+        ///
+        /// <returns>the video grant payload</returns>
+        public object Payload
+        {
+            get
+            {
+                return Grant;
+            }
+        }
+    }
+}

test/Twilio.Test/Jwt/AccessToken/AccessTokenTest.cs

@@ -287,5 +287,41 @@ public void TestCreateVideoGrant()
             Assert.AreEqual("RM123", decodedVg["room"]);
         }
 
+        [Test]
+        public void TestCreatePlaybackGrant()
+        {
+            var grants = new HashSet<IGrant>
+            {
+                {
+                    new PlaybackGrant {
+                        Grant =  new Dictionary<string, object> {
+                            { "requestCredentials", null },
+                            { "playbackUrl", "https://000.us-east-1.playback.live-video.net/api/video/v1/us-east-000.channel.000?token=xxxxx" },
+                            { "playerStreamerSid", "VJXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" },
+                        }
+                    }
+                }
+            };
+            var token = new TestToken("AC456", "SK123", Secret, grants: grants).ToJwt();
+            Assert.IsNotNull(token);
+            Assert.IsNotEmpty(token);
+
+            var decoded = new DecodedJwt(token, Secret);
+            var payload = decoded.Payload;
+            Assert.IsNotNull(payload);
+
+            Assert.AreEqual("SK123", payload["iss"]);
+            Assert.AreEqual("AC456", payload["sub"]);
+            Assert.Greater(Convert.ToInt64(payload["exp"]), BaseJwt.ConvertToUnixTimestamp(DateTime.UtcNow));
+
+            var decodedGrants = ToDict(payload["grants"]);
+            Assert.AreEqual(1, decodedGrants.Count);
+
+            var decodedVg = ToDict(decodedGrants["player"]);
+            Assert.AreEqual(null, decodedVg["requestCredentials"]);
+            Assert.AreEqual("https://000.us-east-1.playback.live-video.net/api/video/v1/us-east-000.channel.000?token=xxxxx", decodedVg["playbackUrl"]);
+            Assert.AreEqual("VJXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", decodedVg["playerStreamerSid"]);
+        }
+
     }
 }