Create CoapException from CoapMessage

NZSmartie · Dec 4, 2017 · 30ea8d2 · 30ea8d2
1 parent 30d06ee
commit 30ea8d2
Showing 1 changed file with 20 additions and 0 deletions.
diff --git a/src/CoAPNet/CoapException.cs b/src/CoAPNet/CoapException.cs
@@ -16,6 +16,7 @@
 
 using System;
 using System.Diagnostics.CodeAnalysis;
+using System.Linq;
 
 namespace CoAPNet
 {
@@ -51,5 +52,24 @@ public CoapException(string message, Exception innerException, CoapMessageCode r
         {
             ResponseCode = responseCode;
         }
+
+        public static CoapException FromCoapMessage(CoapMessage message, Exception innerExcpetion = null)
+        {
+            if (message == null)
+                throw new ArgumentNullException(nameof(message));
+
+            var errorMessage = string.Empty;
+            var contentFormat = message.Options.Get<Options.ContentFormat>();
+
+            if (contentFormat != null && message.Payload != null)
+            {
+                if (contentFormat.MediaType == Options.ContentFormatType.TextPlain)
+                    errorMessage = System.Text.Encoding.UTF8.GetString(message.Payload);
+                else
+                    errorMessage = string.Join(", ", message.Payload.Select(b => $"0x{b:X2}"));
+            }
+
+            return new CoapException(errorMessage, innerExcpetion, message.Code);
+        }
     }
 }