I am trying to put a blob with Azure rest api. i made a “GET” request successfully but i had issues with “PUT” request. When i try to make “PUT” request i get a 404error (i have seen same post in stackoverflow but it didnt help me).i am not sure if the MessageSignature that i use is correct(i have tried MessageSignaturePut but didnt work). Any suggestions?
public void UploadBlobWithRestAPI(string uri, DateTime now)
{
string blobName = "test.txt";
string method = "PUT";
string sampleContent = "This is sample text.";
int contentLength = Encoding.UTF8.GetByteCount(sampleContent);
string queryString = (new Uri(uri)).Query;
string blobContainerUri = uri.Substring(0, uri.Length - queryString.Length);
string requestUri = string.Format(CultureInfo.InvariantCulture, "{0}/{1}{2}", blobContainerUri, blobName, queryString);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(requestUri);
string nnow = now.ToString("R", System.Globalization.CultureInfo.InvariantCulture);
request.Method = method;
request.Headers.Add("x-ms-version", "2015-02-21");
request.Headers.Add("x-ms-date", nnow);
request.ContentType = "text/plain; charset=UTF-8";
request.Headers.Add("x-ms-blob-type", "BlockBlob");
request.ContentLength = contentLength;
using (Stream requestStream = request.GetRequestStream())
{
requestStream.Write(Encoding.UTF8.GetBytes(sampleContent), 0, contentLength);
}
request.Headers.Add("Authorization", AuthorizationHeader(method, now, request, "", ""));
using (HttpWebResponse resp = (HttpWebResponse)request.GetResponse())
{
MessageBox.Show(resp.StatusCode.ToString());
}
}
public string AuthorizationHeader(string method, DateTime now, HttpWebRequest request,
string ifMatch = "", string md5 = "")
{
string MessageSignature;
string StorageKey = "xxx";
string StorageAccount = "upgradedevstorage";
MessageSignature = String.Format("{0}nnn{1}n{5}nnnn{2}nnnn{3}{4}",
method,
(method == "GET" || method == "HEAD") ? String.Empty : request.ContentLength.ToString(),
ifMatch,
GetCanonicalizedHeaders(request),
GetCanonicalizedResource(request.RequestUri, StorageAccount),
md5
);
??? //string MessageSignaturePut= String.Format("{0}nn{1}nn{2}{3}",
// method,
// "text/plain; charset=UTF-8",
// GetCanonicalizedHeaders(request),
// GetCanonicalizedResource(request.RequestUri, StorageAccount)
// );
byte[] SignatureBytes = System.Text.Encoding.UTF8.GetBytes(MessageSignature);
System.Security.Cryptography.HMACSHA256 SHA256 =
new System.Security.Cryptography.HMACSHA256(Convert.FromBase64String(StorageKey));
string signature = Convert.ToBase64String(SHA256.ComputeHash(SignatureBytes));
string AuthorizationHeader = "SharedKey " + StorageAccount
+ ":" + Convert.ToBase64String(SHA256.ComputeHash(SignatureBytes));
return AuthorizationHeader;
}
Answer
Please consider the following code snippet. This should work for you.
void UploadBlobWithRestAPI() {
string storageKey = "<your access key here>";
string storageAccount = "<your storage account name here>";
string containerName = "<your container name here>";
string blobName = "test.txt";
string method = "PUT";
string sampleContent = "This is sample text.";
int contentLength = Encoding.UTF8.GetByteCount(sampleContent);
string requestUri = $"https://{storageAccount}.blob.core.windows.net/{containerName}/{blobName}";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(requestUri);
string now = DateTime.UtcNow.ToString("R");
request.Method = method;
request.ContentType = "text/plain; charset=UTF-8";
request.ContentLength = contentLength;
request.Headers.Add("x-ms-version", "2015-12-11");
request.Headers.Add("x-ms-date", now);
request.Headers.Add("x-ms-blob-type", "BlockBlob");
request.Headers.Add("Authorization", AuthorizationHeader(method, now, request, storageAccount, storageKey, containerName, blobName));
using (Stream requestStream = request.GetRequestStream()) {
requestStream.Write(Encoding.UTF8.GetBytes(sampleContent), 0, contentLength);
}
using (HttpWebResponse resp = (HttpWebResponse)request.GetResponse()) {
MessageBox.Show(resp.StatusCode.ToString());
}
}
public string AuthorizationHeader(string method, string now, HttpWebRequest request, string storageAccount, string storageKey, string containerName, string blobName) {
string headerResource = $"x-ms-blob-type:BlockBlobnx-ms-date:{now}nx-ms-version:2015-12-11";
string urlResource = $"/{storageAccount}/{containerName}/{blobName}";
string stringToSign = $"{method}nnn{request.ContentLength}nn{request.ContentType}nnnnnnn{headerResource}n{urlResource}";
HMACSHA256 hmac = new HMACSHA256(Convert.FromBase64String(storageKey));
string signature = Convert.ToBase64String(hmac.ComputeHash(Encoding.UTF8.GetBytes(stringToSign)));
String AuthorizationHeader = String.Format("{0} {1}:{2}", "SharedKey", storageAccount, signature);
return AuthorizationHeader;
}
And the traffic captured by Fiddler as follows:
