Use a central list of private types

arn/Private.go

@@ -0,0 +1,22 @@
+package arn
+
+var (
+	privateCollections = map[string]bool{
+		"Analytics":         true,
+		"Crash":             true,
+		"ClientErrorReport": true,
+		"EditLogEntry":      true,
+		"EmailToUser":       true,
+		"FacebookToUser":    true,
+		"PayPalPayment":     true,
+		"Purchase":          true,
+		"Session":           true,
+		"TwitterToUser":     true,
+	}
+)
+
+// IsPrivateType tells you whether the given type is private.
+// Private types contains user-sensitive or security related data.
+func IsPrivateType(typeName string) bool {
+	return privateCollections[typeName]
+}