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CloudBlobContainer.SetPermissions Method (BlobContainerPermissions)

Updated: April 24, 2013

[This topic is part of the Microsoft Azure Storage Client Library 1.7, which has been deprecated. See Storage Client Library for the latest version.]

Sets permissions for the container.

Namespace: Microsoft.WindowsAzure.StorageClient
Assembly: Microsoft.WindowsAzure.StorageClient (in Microsoft.WindowsAzure.StorageClient.dll)

'Gebruik
Dim instance As CloudBlobContainer
Dim permissions As BlobContainerPermissions

instance.SetPermissions(permissions)

public void SetPermissions (
	BlobContainerPermissions permissions
)

Parameters

permissions

Type: Microsoft.WindowsAzure.StorageClient.BlobContainerPermissions

The permissions to apply to the container.

The following code example sets both public access permissions and a container-level access policy on the container. The example then generates a shared access signature for the container.

static void CreateSAS()
{
    // Retrieve storage account information from an app.config file.
    // This is one way to store and retrieve a connection string if you are writing 
    // an application that will run locally, rather than in Windows Azure.
    CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
        ConfigurationManager.AppSettings["StorageAccountConnectionString"]);

    // Create the blob client object.
    CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

    // Get a reference to the container for which the shared access signature will be created.
    CloudBlobContainer container = blobClient.GetContainerReference("mysascontainer");
    container.CreateIfNotExist();

    // Create a permission policy to set the public access setting for the container. 
    BlobContainerPermissions containerPermissions = new BlobContainerPermissions();

    // The public access setting explicitly specifies that the container is private, 
    // so that it can't be accessed anonymously.
    containerPermissions.PublicAccess = BlobContainerPublicAccessType.Off;

    //Set the permission policy on the container.
    container.SetPermissions(containerPermissions);

    // Get the shared access signature to share with users, 
    // specifying a signature-level access policy.
    string sas = container.GetSharedAccessSignature(new SharedAccessPolicy()
    {
        // A shared access signature not tied to a container-level access policy
        // cannot be valid for more than 60 minutes.
        //If valid immediately, don’t set SharedAccessStartTime,
        //and specify a duration less than 60 minutes, such as 55 minutes,
        //to avoid clock skew risk.
        // SharedAccessStartTime = DateTime.UtcNow,

        SharedAccessExpiryTime = DateTime.UtcNow.AddMinutes(30),
        Permissions = SharedAccessPermissions.Write | SharedAccessPermissions.Read
    });

    //The shared access signature then can be used to create a service client. 
    //This code would likely be run from a different client, but is included here to 
    //demonstrate how to consume the shared access signature.

    //Create the blob client directly, using the shared access signature
    CloudBlobClient sasBlobClient = new CloudBlobClient(storageAccount.BlobEndpoint,
        new StorageCredentialsSharedAccessSignature(sas));

    //Return a reference to a blob.
    CloudBlob blob = sasBlobClient.GetBlobReference("mysascontainer/myblob.txt");

    //Upload text to the blob. If the blob does not yet exist, it will be created. 
    // If the blob does exist, its existing content will be overwritten.
    blob.UploadText("Write to a blob using shared access credentials.");
}

The SetPermissions method sets two types of permissions for the container:

  • Public access permissions, which determine whether container data and blob resources are available for anonymous access.

  • Container-level access policies, which can be used to specify parameters for a shared access signature for the container.


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Development Platforms

Windows Vista, Windows 7, Windows Server 2008, Windows 8.1, Windows Server 2012 R2, Windows 8 and Windows Server 2012

 

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