From 606262514b013203220f4ae409689448da7feceb Mon Sep 17 00:00:00 2001
From: "John C. Vernaleo" <jcv@conformal.com>
Date: Mon, 18 Nov 2013 13:23:05 -0500
Subject: [PATCH] Improve error messages.

Attempt to determine if error when sending a command is due to auth
issue and give more useful error in that case.
---
 jsonapi.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/jsonapi.go b/jsonapi.go
index 5ab57f2c..13e6e889 100644
--- a/jsonapi.go
+++ b/jsonapi.go
@@ -7,6 +7,7 @@ package btcjson
 import (
 	"encoding/json"
 	"fmt"
+	"strings"
 )
 
 // Message contains a message to be sent to the bitcoin client.
@@ -741,7 +742,11 @@ func ReadResultCmd(cmd string, message []byte) (Reply, error) {
 	var objmap map[string]json.RawMessage
 	err = json.Unmarshal(message, &objmap)
 	if err != nil {
-		err = fmt.Errorf("Error unmarshalling json reply: %v", err)
+		if strings.Contains(string(message), "401 Unauthorized.") {
+			err = fmt.Errorf("Authentication error.")
+		} else {
+			err = fmt.Errorf("Error unmarshalling json reply: %v", err)
+		}
 		return result, err
 	}
 	// Take care of the parts that are the same for all replies.