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POUpload to S3 from HTTPWebResponse.GetResponseStream() in c#
 

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    <p>I am trying to upload from an HTTP stream directly to S3, without storing in memory or as a file first. I am already doing this with Rackspace Cloud Files as HTTP to HTTP, however the AWS authentication is beyond me so am trying to use the SDK.</p> <p>The problem is the upload stream is failing with this exception:</p> <p><code>"This stream does not support seek operations."</code></p> <p>I've tried with <code>PutObject</code> and <code>TransferUtility.Upload</code>, both fail with the same thing.</p> <p>Is there any way to stream into S3 as the stream comes in, rather than buffering the whole thing to a <code>MemoryStream</code> or <code>FileStream</code>?</p> <p><em>or</em> is there any good examples of doing the authentication into S3 request using HTTPWebRequest, so I can duplicate what I do with Cloud Files?</p> <p><strong>Edit:</strong> <em>or</em> is there a helper function in the AWSSDK for generating the authorization header?</p> <p><strong>CODE:</strong></p> <p>This is the failing S3 part (both methods included for completeness):</p> <pre><code>string uri = RSConnection.StorageUrl + "/" + container + "/" + file.SelectSingleNode("name").InnerText; var req = (HttpWebRequest)WebRequest.Create(uri); req.Headers.Add("X-Auth-Token", RSConnection.AuthToken); req.Method = "GET"; using (var resp = req.GetResponse() as HttpWebResponse) { using (Stream stream = resp.GetResponseStream()) { Amazon.S3.Transfer.TransferUtility trans = new Amazon.S3.Transfer.TransferUtility(S3Client); trans.Upload(stream, config.Element("root").Element("S3BackupBucket").Value, container + file.SelectSingleNode("name").InnerText); //Use EITHER the above OR the below PutObjectRequest putReq = new PutObjectRequest(); putReq.WithBucketName(config.Element("root").Element("S3BackupBucket").Value); putReq.WithKey(container + file.SelectSingleNode("name").InnerText); putReq.WithInputStream(Amazon.S3.Util.AmazonS3Util.MakeStreamSeekable(stream)); putReq.WithMetaData("content-length", file.SelectSingleNode("bytes").InnerText); using (S3Response putResp = S3Client.PutObject(putReq)) { } } } </code></pre> <p>And this is how I do it successfully from S3 to Cloud Files:</p> <pre><code>using (GetObjectResponse getResponse = S3Client.GetObject(new GetObjectRequest().WithBucketName(bucket.BucketName).WithKey(file.Key))) { using (Stream s = getResponse.ResponseStream) { //We can stream right from s3 to CF, no need to store in memory or filesystem. var req = (HttpWebRequest)WebRequest.Create(uri); req.Headers.Add("X-Auth-Token", RSConnection.AuthToken); req.Method = "PUT"; req.AllowWriteStreamBuffering = false; if (req.ContentLength == -1L) req.SendChunked = true; using (Stream stream = req.GetRequestStream()) { byte[] data = new byte[32768]; int bytesRead = 0; while ((bytesRead = s.Read(data, 0, data.Length)) &gt; 0) { stream.Write(data, 0, bytesRead); } stream.Flush(); stream.Close(); } req.GetResponse().Close(); } } </code></pre>
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