/// <summary>
/// Check whether the object key exists and hash is equivalent. If these are the same we will skip the upload.
/// </summary>
/// <param name="client"></param>
/// <param name="request"></param>
/// <returns></returns>
private async Task <bool> ShouldUpload(AmazonS3Client client, PutObjectRequest request)
{
//This isn't ideal, however the AWS SDK doesn't really provide any means to check the existence of an object.
try
{
if (!md5HashSupported)
{
return(true);
}
var metadataResponse = await client.GetObjectMetadataAsync(request.BucketName, request.Key);
return(!metadataResponse.GetEtag().IsSameAsRequestMd5Digest(request) || !request.HasSameMetadata(metadataResponse));
}
catch (AmazonServiceException exception)
{
if (exception.StatusCode == HttpStatusCode.NotFound)
{
return(true);
}
throw;
}
}
