private string InitiateMultipartUpload(string accessKey, string secretKey, Uri requestUri, DateTime requestDate, string contentType, NameValueCollection requestHeaders)
{
string uploadId;
var uploadIdRequestUrl = new Uri(string.Format("{0}?uploads=", requestUri.AbsoluteUri));
var uploadIdRequestUrlRequestHeaders = new NameValueCollection();
if (requestHeaders != null)
{
for (int i = 0; i < requestHeaders.Count; i++)
{
var key = requestHeaders.Keys[i];
var value = requestHeaders[key];
if (key.StartsWith("x-amz-", StringComparison.InvariantCultureIgnoreCase))
{
uploadIdRequestUrlRequestHeaders.Add(key, value);
}
}
}
var stringToSign = SignatureHelper.CreateStringToSign(uploadIdRequestUrl, "POST", string.Empty, contentType, requestDate, requestHeaders);
var signatureForUploadId = SignatureHelper.CreateSignature(secretKey, stringToSign);
uploadIdRequestUrlRequestHeaders.Add("Authorization", string.Format("AWS {0}:{1}", accessKey, signatureForUploadId));
var request = (HttpWebRequest)WebRequest.Create(uploadIdRequestUrl);
request.Method = "POST";
request.ContentLength = 0;
request.Date = requestDate;
request.ContentType = contentType;
request.Headers.Add(uploadIdRequestUrlRequestHeaders);
using (var resp = (HttpWebResponse)request.GetResponse())
{
using (var s = new StreamReader(resp.GetResponseStream()))
{
var response = s.ReadToEnd();
XElement xe = XElement.Parse(response);
uploadId = xe.Element(XName.Get("UploadId", "http://s3.amazonaws.com/doc/2006-03-01/")).Value;
}
}
return(uploadId);
}
private string FinishMultipartUpload(string accessKey, string secretKey, Uri requestUri, string uploadId, Dictionary <int, string> partNumberETags, DateTime expiryDate)
{
var timeSpan = new TimeSpan(expiryDate.Ticks - _jan1St1970Ticks);
long expiry = Convert.ToInt64(timeSpan.TotalSeconds);
var finishOrCancelMultipartUploadUri = new Uri(string.Format("{0}?uploadId={1}", requestUri.AbsoluteUri, uploadId));
string signatureForFinishMultipartUpload = SignatureHelper.CreateSignature(secretKey, SignatureHelper.CreateStringToSign(finishOrCancelMultipartUploadUri, "POST", string.Empty, "text/plain", expiry, null));
var finishMultipartUploadUrl = new Uri(string.Format("{0}?uploadId={1}&AWSAccessKeyId={2}&Signature={3}&Expires={4}", requestUri.AbsoluteUri, HttpUtility.UrlEncode(uploadId), accessKey, HttpUtility.UrlEncode(signatureForFinishMultipartUpload), expiry));
var payload = new StringBuilder();
payload.Append("<?xml version=\"1.0\" encoding=\"utf-8\"?><CompleteMultipartUpload>");
foreach (var item in partNumberETags)
{
payload.AppendFormat("<Part><PartNumber>{0}</PartNumber><ETag>{1}</ETag></Part>", item.Key, item.Value);
}
payload.Append("</CompleteMultipartUpload>");
var requestPayload = Encoding.UTF8.GetBytes(payload.ToString());
var request = (HttpWebRequest)WebRequest.Create(finishMultipartUploadUrl);
request.Method = "POST";
request.ContentType = "text/plain";
request.ContentLength = requestPayload.Length;
using (var stream = request.GetRequestStream())
{
stream.Write(requestPayload, 0, requestPayload.Length);
}
using (var resp = (HttpWebResponse)request.GetResponse())
{
}
string signatureForGet = SignatureHelper.CreateSignature(secretKey, SignatureHelper.CreateStringToSign(new Uri(requestUri.AbsoluteUri), "GET", string.Empty, string.Empty, expiry, null));
string signedGetUrl = string.Format("{0}?AWSAccessKeyId={1}&Signature={2}&Expires={3}", requestUri.AbsoluteUri, accessKey, HttpUtility.UrlEncode(signatureForGet), expiry);
return(signedGetUrl);
}
private Dictionary <int, string> UploadParts(string accessKey, string secretKey, Uri requestUri, string uploadId, string filePath, DateTime expiryDate, Action <int, int> callbackForPartDone = null)
{
var partNumberETags = new Dictionary <int, string>();
var timeSpan = new TimeSpan(expiryDate.Ticks - _jan1St1970Ticks);
long expiry = Convert.ToInt64(timeSpan.TotalSeconds);
var fileContents = File.ReadAllBytes(filePath);
int partNumber = 1;
int startPosition = 0;
int bytesToBeUploaded = fileContents.Length;
do
{
int bytesToUpload = Math.Min(FiveMegaBytes, bytesToBeUploaded);
if (callbackForPartDone != null)
{
callbackForPartDone(partNumber, bytesToBeUploaded);
}
var partUploadUrl = new Uri(string.Format("{0}?uploadId={1}&partNumber={2}", requestUri.AbsoluteUri, HttpUtility.UrlEncode(uploadId), partNumber));
string partUploadSignature = SignatureHelper.CreateSignature(secretKey, SignatureHelper.CreateStringToSign(partUploadUrl, "PUT", string.Empty, string.Empty, expiry, null));
var partUploadPreSignedUrl = new Uri(string.Format("{0}?uploadId={1}&partNumber={2}&AWSAccessKeyId={3}&Signature={4}&Expires={5}", requestUri.AbsoluteUri,
HttpUtility.UrlEncode(uploadId), partNumber, accessKey, HttpUtility.UrlEncode(partUploadSignature), expiry));
var request = (HttpWebRequest)WebRequest.Create(partUploadPreSignedUrl);
request.Method = "PUT";
request.Timeout = 1000 * 600;
request.ContentLength = bytesToUpload;
using (var stream = request.GetRequestStream())
{
stream.Write(fileContents, startPosition, bytesToUpload);
}
using (var resp = (HttpWebResponse)request.GetResponse())
{
using (var streamReader = new StreamReader(resp.GetResponseStream()))
{
partNumberETags.Add(partNumber, resp.Headers["ETag"]);
}
}
bytesToBeUploaded = bytesToBeUploaded - bytesToUpload;
startPosition = bytesToUpload;
partNumber = partNumber + 1;
}while (bytesToBeUploaded > 0);
return(partNumberETags);
}