/// <inheritdoc />
public async override Task <StorageToken> GetAccessTokenAsync(StorageTokenRequest request, StorageTokenScope scope, IContainerNameResolver containerNameResolver)
{
if (request == null)
{
throw new ArgumentNullException(nameof(request));
}
if (containerNameResolver == null)
{
throw new ArgumentNullException(nameof(containerNameResolver));
}
string containerName = await containerNameResolver.GetFileContainerNameAsync(request.TargetFile.TableName, request.TargetFile.ParentId, request.TargetFile.Name);
CloudBlobContainer container = GetContainer(containerName);
var constraints = new SharedAccessBlobPolicy();
constraints.SharedAccessExpiryTime = DateTime.UtcNow.AddHours(1);
constraints.Permissions = GetBlobAccessPermissions(request.Permissions);
string sas = null;
Uri resourceUri = null;
if (scope == StorageTokenScope.File)
{
CloudBlockBlob blob = container.GetBlockBlobReference(request.TargetFile.Name);
resourceUri = blob.Uri;
sas = blob.GetSharedAccessSignature(constraints);
}
else if (scope == StorageTokenScope.Record)
{
resourceUri = container.Uri;
sas = container.GetSharedAccessSignature(constraints);
}
var storageToken = new StorageToken(resourceUri, request.TargetFile.ParentId, request.Permissions, scope, sas);
return(storageToken);
}
/// <summary>
/// Retrieves an access token for a given request.
/// </summary>
/// <param name="request">The request the requested access </param>
/// <param name="scope"></param>
/// <param name="containerNameResolver">The instance of an <see cref="IContainerNameResolver"/> used to resolve the storage container name.</param>
/// <returns>A <see cref="Task{StorageToken}"/> that completes when the storage token is generated.</returns>
abstract public Task <StorageToken> GetAccessTokenAsync(StorageTokenRequest request, StorageTokenScope scope, IContainerNameResolver containerNameResolver);
