add x-www-form-urlencoded body for digest

Author: shijiayun

QBox/Client.cs

@@ -6,16 +6,16 @@ namespace QBox
 {
     public abstract class Client
     {
-        public abstract void SetAuth(HttpWebRequest request);
-
+        public abstract void SetAuth(HttpWebRequest request, byte[] body);
+        
         public CallRet Call(string url)
         {
             Console.WriteLine("URL: " + url);
             try
             {
                 HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
                 request.Method = "POST";
-                SetAuth(request);
+                SetAuth(request, null);
                 using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
                 {
                     return HandleResult(response);
@@ -37,7 +37,7 @@ public CallRet CallWithBinary(string url, string contentType, byte[] body)
                 request.Method = "POST";
                 request.ContentType = contentType;
                 request.ContentLength = body.Length;
-                SetAuth(request);
+                SetAuth(request, body);
                 using (Stream requestStream = request.GetRequestStream())
                 {
                     requestStream.Write(body, 0, body.Length);

QBox/DigestAuthClient.cs

@@ -8,18 +8,27 @@ namespace QBox
 {
     public class DigestAuthClient : Client
     {
-        public override void SetAuth(HttpWebRequest request)
+        public override void SetAuth(HttpWebRequest request, byte[] body)
         {
             byte[] secretKey = Encoding.ASCII.GetBytes(Config.SECRET_KEY);
             using (HMACSHA1 hmac = new HMACSHA1(secretKey))
             {
                 string pathAndQuery = request.Address.PathAndQuery;
-                byte[] bytesIn = Encoding.ASCII.GetBytes(pathAndQuery + "\n");
-                byte[] digest = hmac.ComputeHash(bytesIn);
-                string digestBase64 = Base64UrlSafe.Encode(digest);
+                byte[] pathAndQueryBytes = Encoding.ASCII.GetBytes(pathAndQuery);
+                using (MemoryStream buffer = new MemoryStream())
+                {
+                    buffer.Write(pathAndQueryBytes, 0, pathAndQueryBytes.Length);
+                    buffer.WriteByte((byte)'\n');
+                    if (request.ContentType == "application/x-www-form-urlencoded" && body != null)
+                    {
+                        buffer.Write(body, 0, body.Length);
+                    }
+                    byte[] digest = hmac.ComputeHash(buffer.ToArray());
+                    string digestBase64 = Base64UrlSafe.Encode(digest);
 
-                string authHead = "QBox " + Config.ACCESS_KEY + ":" + digestBase64;
-                request.Headers.Add("Authorization", authHead);
+                    string authHead = "QBox " + Config.ACCESS_KEY + ":" + digestBase64;
+                    request.Headers.Add("Authorization", authHead);
+                }
             }
         }
     }