Databases
StackOverflow2013
Postsdbo
POHow to use SharedAccessSignature to access blobs
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHow to use SharedAccessSignature to access blobs
    primarykey
    data
    text
    <p>I am trying to access a blob stored in a private container in Windows Azure. The container has a Shared Access Signature but when I try to access the blob I get a StorgeClientException "Server failed to authenticate the request. Make sure the Authorization header is formed correctly including the signature".</p> <p>The code that created the container and uploaded the blob looks like this:</p> <pre><code>// create the container, set a Shared Access Signature, and share it // first this to do is to create the connnection to the storage account // this should be in app.config but as this isa test it will just be implemented // here: // add a reference to Microsoft.WindowsAzure.StorageClient // and Microsoft.WindowsAzure.StorageClient set up the objects //storageAccount = CloudStorageAccount.DevelopmentStorageAccount; storageAccount = CloudStorageAccount.Parse(ConfigurationManager.AppSettings["ConnectionString"]); blobClient = storageAccount.CreateCloudBlobClient(); // get a reference tot he container for the shared access signature container = blobClient.GetContainerReference("blobcontainer"); container.CreateIfNotExist(); // now create the permissions policy to use and a public access setting var permissions = container.GetPermissions(); permissions.SharedAccessPolicies.Remove("accesspolicy"); permissions.SharedAccessPolicies.Add("accesspolicy", new SharedAccessPolicy { // this policy is live immediately // if the policy should be delatyed then use: //SharedAccessStartTime = DateTime.Now.Add(T); where T is some timespan SharedAccessExpiryTime = DateTime.UtcNow.AddYears(2), Permissions = SharedAccessPermissions.Read | SharedAccessPermissions.Write }); // turn off public access permissions.PublicAccess = BlobContainerPublicAccessType.Off; // set the permission on the ocntianer container.SetPermissions(permissions); var sas = container.GetSharedAccessSignature(new SharedAccessPolicy(), "accesspolicy"); StorageCredentialsSharedAccessSignature credentials = new StorageCredentialsSharedAccessSignature(sas); CloudBlobClient client = new CloudBlobClient(storageAccount.BlobEndpoint, new StorageCredentialsSharedAccessSignature(sas)); CloudBlob sasblob = client.GetBlobReference("blobcontainer/someblob.txt"); sasblob.UploadText("I want to read this text via a rest call"); // write the SAS to file so I can use it later in other apps using (var writer = new StreamWriter(@"C:\policy.txt")) { writer.WriteLine(container.GetSharedAccessSignature(new SharedAccessPolicy(), "securedblobpolicy")); } </code></pre> <p>The code I have been trying to use to read the blob looks like this:</p> <pre><code>// the storace credentials shared access signature is copied directly from the text file "c:\policy.txt" CloudBlobClient client = new CloudBlobClient("https://my.azurestorage.windows.net/", new StorageCredentialsSharedAccessSignature("?sr=c&amp;si=accesspolicy&amp;sig=0PMoXpht2TF1Jr0uYPfUQnLaPMiXrqegmjYzeg69%2FCI%3D")); CloudBlob blob = client.GetBlobReference("blobcontainer/someblob.txt"); Console.WriteLine(blob.DownloadText()); Console.ReadLine(); </code></pre> <p>I can make the above work by adding the account credentials but that is exactly what I'm trying to avoid. I do not want something as sensitive as my account credentials just sitting out there and I have no idea on how to get the signature into the client app without having the account credentials.</p> <p>Any help is greatly appreciated.</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. UScrunchy
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload