Add support for verdict and decision reason context

profile/endpoints/reason.go

@@ -0,0 +1,34 @@
+package endpoints
+
+// Reason describes the reason why an endpoint has been
+// permitted or blocked.
+type Reason interface {
+	// String should return a human readable string
+	// describing the decision reason.
+	String() string
+
+	// Context returns the context that was used
+	// for the decision.
+	Context() interface{}
+}
+
+type reason struct {
+	description string
+	Filter      string
+	Value       string
+	Permitted   bool
+	Extra       map[string]interface{}
+}
+
+func (r *reason) String() string {
+	prefix := "endpoint in blocklist: "
+	if r.Permitted {
+		prefix = "endpoint in whitelist: "
+	}
+
+	return prefix + r.description + " " + r.Value
+}
+
+func (r *reason) Context() interface{} {
+	return r
+}