From 77549334701da78d3924abb378a71559ee4c7049 Mon Sep 17 00:00:00 2001
From: Anthony Lapenna <lapenna.anthony@gmail.com>
Date: Wed, 9 May 2018 16:11:52 +0200
Subject: [PATCH] fix(api): fix a panic issue when retrieving Docker API
 response

---
 api/http/proxy/response.go | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/api/http/proxy/response.go b/api/http/proxy/response.go
index 4208f438c..751e3df31 100644
--- a/api/http/proxy/response.go
+++ b/api/http/proxy/response.go
@@ -13,6 +13,8 @@ import (
 const (
 	// ErrEmptyResponseBody defines an error raised when portainer excepts to parse the body of a HTTP response and there is nothing to parse
 	ErrEmptyResponseBody = portainer.Error("Empty response body")
+	// ErrInvalidResponseContent defines an error raised when Portainer excepts a JSON array and get something else.
+	ErrInvalidResponseContent = portainer.Error("Invalid Docker response")
 )
 
 func extractJSONField(jsonObject map[string]interface{}, key string) map[string]interface{} {
@@ -39,8 +41,17 @@ func getResponseAsJSONArray(response *http.Response) ([]interface{}, error) {
 		return nil, err
 	}
 
-	responseObject := responseData.([]interface{})
-	return responseObject, nil
+	switch responseObject := responseData.(type) {
+	case []interface{}:
+		return responseObject, nil
+	case map[string]interface{}:
+		if responseObject["message"] != nil {
+			return nil, portainer.Error(responseObject["message"].(string))
+		}
+		return nil, ErrInvalidResponseContent
+	default:
+		return nil, ErrInvalidResponseContent
+	}
 }
 
 func getResponseBodyAsGenericJSON(response *http.Response) (interface{}, error) {