Added generic UnmarshalJSON for activitystreams package

activitystreams/unmarshalling.go

@@ -282,6 +282,12 @@ func getAPLangRefField(data []byte, prop string) LangRef {
 	return LangRef(val)
 }
 
+// UnmarshalJSON tries to detect the type of the object in the json data and then outputs a matching
+// ActivityStreams object, if possible
+func UnmarshalJSON(data []byte) (Item, error) {
+	return unmarshalToAPObject(data), nil
+}
+
 /*
 func unmarshal(data []byte, a interface{}) (interface{}, error) {
 	ta := make(mockObj, 0)

activitystreams/unmarshalling_test.go

@@ -0,0 +1,14 @@
+package activitystreams
+
+import "testing"
+
+func TestUnmarshalJSON(t *testing.T) {
+	dataEmpty := []byte("{}")
+	i, err := UnmarshalJSON(dataEmpty)
+	if err != nil {
+		t.Errorf("invalid unmarshalling %s", err)
+	}
+
+	o := *i.(*Object)
+	validateEmptyObject(o, t)
+}