Ephemeral attachments

src/Discord.Net.Core/Entities/Messages/IAttachment.cs

@@ -55,5 +55,12 @@ namespace Discord
         ///     The width of this attachment if it is a picture; otherwise <c>null</c>.
         /// </returns>
         int? Width { get; }
+        /// <summary>
+        ///     Gets whether or not this attachment is ephemeral.
+        /// </summary>
+        /// <returns>
+        ///     <see langword="true"/> if the attachment is ephemeral; otherwise <see langword="false"/>.
+        /// </returns>
+        bool Ephemeral { get; }
     }
 }

src/Discord.Net.Rest/API/Common/Attachment.cs

@@ -18,5 +18,6 @@ namespace Discord.API
         public Optional<int> Height { get; set; }
         [JsonProperty("width")]
         public Optional<int> Width { get; set; }
+        public Optional<bool> Ephemeral { get; set; }
     }
 }

src/Discord.Net.Rest/Entities/Messages/Attachment.cs

@@ -21,8 +21,10 @@ namespace Discord
         public int? Height { get; }
         /// <inheritdoc />
         public int? Width { get; }
+        /// <inheritdoc />
+        public bool Ephemeral { get; }
 
-        internal Attachment(ulong id, string filename, string url, string proxyUrl, int size, int? height, int? width)
+        internal Attachment(ulong id, string filename, string url, string proxyUrl, int size, int? height, int? width, bool? ephemeral)
         {
             Id = id;
             Filename = filename;
@@ -31,12 +33,14 @@ namespace Discord
             Size = size;
             Height = height;
             Width = width;
+            Ephemeral = ephemeral.GetValueOrDefault(false);
         }
         internal static Attachment Create(Model model)
         {
             return new Attachment(model.Id, model.Filename, model.Url, model.ProxyUrl, model.Size,
                 model.Height.IsSpecified ? model.Height.Value : (int?)null,
-                model.Width.IsSpecified ? model.Width.Value : (int?)null);
+                model.Width.IsSpecified ? model.Width.Value : (int?)null,
+                model.Ephemeral.ToNullable());
         }
 
         /// <summary>