UpdateMetadata during CopyObject issue: "The request signature we calculated does not match the signature you provided. Check your key and signing method."

Hello,

basically the minio-dotnet client works great, but shouldn’t it be supported to update the metadata of an object by using the CopyObjectAsync? Doing so results in an MinioException:

Minio.Exceptions.MinioException:
MinIO API responded with message=The request signature we calculated does not match the signature you provided. Check your key and signing method.\r\n   at Minio.MinioClient.ParseError(IRestResponse response) 

Please see also the following test:

private async static Task UpdateMetadata_Test(MinioClient minio)
        {
            DateTime startTime = DateTime.Now;
            string bucketName = GetRandomName(15);
            string objectName = GetRandomName(10);
            string destBucketName = bucketName;
            string destObjectName =objectName;
            Dictionary<string,string> args = new Dictionary<string,string>
            {
                {"bucketName", bucketName},
                {"objectName",objectName},
                {"destBucketName", destBucketName},
                {"destObjectName", destObjectName},
                {"data","1KB"},
                {"size","1KB"},
                {"copyconditions","x-amz-metadata-directive:REPLACE"},
            };
            try
            {
                await Setup_Test(minio, bucketName);
                using (MemoryStream filestream = rsg.GenerateStreamFromSeed(1 * KB))
                {
                    await minio.PutObjectAsync(bucketName,
                                            objectName,
                                            filestream, filestream.Length, metaData:new Dictionary<string,string>{{"X-Amz-Meta-Orig", "orig-val with  spaces"}});
                }
                ObjectStat stats = await minio.StatObjectAsync(bucketName, objectName);

                Assert.IsTrue(stats.metaData["X-Amz-Meta-Orig"] != null) ;

                CopyConditions copyCond = new CopyConditions();
                copyCond.SetReplaceMetadataDirective();

                // set custom metadata
                Dictionary<string,string> metadata = new Dictionary<string,string>()
                {
                    { "Content-Type", "application/css"},
                    {"X-Amz-Meta-Mynewkey","test   test"}
                };
                await minio.CopyObjectAsync(bucketName, objectName, destBucketName, destObjectName,copyConditions:copyCond,metadata: metadata);

                ObjectStat dstats = await minio.StatObjectAsync(destBucketName, destObjectName);
                Assert.IsTrue(dstats.metaData["X-Amz-Meta-Mynewkey"] != null);
                await minio.RemoveObjectAsync(bucketName, objectName);
                await minio.RemoveObjectAsync(destBucketName, destObjectName);


                await TearDown(minio, bucketName);
                await TearDown(minio, destBucketName);
                new MintLogger("CopyObject_Test8",copyObjectSignature,"Tests whether CopyObject with metadata replacement passes",TestStatus.PASS,(DateTime.Now - startTime), args:args).Log();
            }
            catch (MinioException ex)
            {
                new MintLogger("CopyObject_Test8",copyObjectSignature,"Tests whether CopyObject with metadata replacement passes",TestStatus.FAIL,(DateTime.Now - startTime),"",ex.Message, ex.ToString(),args).Log();
            }
        }

[poornas]

@ptr1120, port is being stripped off the host header by underlying httpclient which leads to a mismatch between signature sent by client to that computed by server. There was a bug in dotnet corefx which was fixed last year (https://github.com/restsharp/RestSharp/issues/1085) - will have to dig further to pinpoint whether it is an issue with Restsharp / HttpClient in dotnet/corefx

[harshavardhana]

Please upgrade to the latest release and re-open if seen again.