/// <summary>
/// Generates the blob container SAS URL.
/// </summary>
/// <param name="storageAccount">The storage account.</param>
/// <param name="dto">The data transfer object.</param>
private static void GenerateBlobContainerSasUrl(CloudStorageAccount storageAccount, DataDto dto)
{
// Create the blob client.
var blobClient = storageAccount.CreateCloudBlobClient();
// Use the client's name as container
var container = blobClient.GetContainerReference("datacontainer");
// Create the container if it doesn't already exist.
// TODO: Avoid the next line of code in productive systems, since it makes a call to azure blob storage.
// It's better to make sure the container always exists from the beginning.
container.CreateIfNotExists();
// Set the expiry time and permissions for the container.
// In this case no start time is specified, so the shared access signature becomes valid immediately.
var accessBlobPolicy = new SharedAccessBlobPolicy();
accessBlobPolicy.SharedAccessExpiryTime = DateTime.UtcNow.AddHours(1);
accessBlobPolicy.Permissions = SharedAccessBlobPermissions.Write;
// Generate the SAS token. No access policy identifier is used which makes it non revocable.
// The token is generated without issuing any calls against the Windows Azure Storage.
string sasToken = container.GetSharedAccessSignature(accessBlobPolicy);
dto.BlobContainerUrl = container.Uri;
dto.BlobSasToken = sasToken;
}
/// <summary>
/// Get BLOB and Queue SAS URL.
/// </summary>
/// <returns>
/// A data transfer object with the two URLs.
/// </returns>
public DataDto Get()
{
Console.WriteLine("Received a request from a client.");
var dto = new DataDto();
var credentials = new StorageCredentials("rwwa", "vyMfaSPxURHXZaIhhFJQRg5ZLEN6qDj4yU78r3oeOH+pZzdcf4S86QvGAsB6L8JaPti9qJbB929hy1Y9hipFmw==");
// Retrieve storage account from connection string.
var storageAccount = new CloudStorageAccount(credentials, true);
GenerateBlobContainerSasUrl(storageAccount, dto);
GenerateQueueSasUrl(storageAccount, dto);
Console.WriteLine("Respond with Blob and Queue SAS Urls.");
return dto;
}
/// <summary>
/// Get BLOB and Queue SAS URL.
/// </summary>
/// <returns>
/// A data transfer object with the two URLs.
/// </returns>
public DataDto Get()
{
Console.WriteLine("Received a request from a client.");
var dto = new DataDto();
var credentials = new StorageCredentials("[Enter your account name]", "[Enter your account key]");
// Retrieve storage account from connection string.
var storageAccount = new CloudStorageAccount(credentials, true);
GenerateBlobContainerSasUrl(storageAccount, dto);
GenerateQueueSasUrl(storageAccount, dto);
Console.WriteLine("Respond with Blob and Queue SAS Urls.");
return dto;
}
/// <summary>
/// Generates the queue SAS URL.
/// </summary>
/// <param name="storageAccount">The storage account.</param>
/// <param name="dto">The data transfer object.</param>
private static void GenerateQueueSasUrl(CloudStorageAccount storageAccount, DataDto dto)
{
CloudQueueClient queueClient = storageAccount.CreateCloudQueueClient();
// Retrieve a reference to a queue
CloudQueue queue = queueClient.GetQueueReference("dataqueue");
// Create the queue if it doesn't already exist
// TODO: Avoid the next line of code in productive systems, since it makes call to azure queue storage.
// It's better to make sure the queue always exists from the beginning.
queue.CreateIfNotExists();
var accessQueuePolicy = new SharedAccessQueuePolicy();
accessQueuePolicy.SharedAccessExpiryTime = DateTime.UtcNow.AddHours(1);
accessQueuePolicy.Permissions = SharedAccessQueuePermissions.Add;
// Generate the SAS token. No access policy identifier is used which makes it non revocable.
// The token is generated without issuing any calls against the Windows Azure Storage.
string sasToken = queue.GetSharedAccessSignature(accessQueuePolicy, null);
dto.QueueUrl = queue.Uri;
dto.QueueSasToken = sasToken;
}
