/// <summary>
/// Implements the FetchAttributes method. The attributes are updated immediately.
/// </summary>
/// <param name="blobUri">The URI of the blob.</param>
/// <param name="accessCondition">An <see cref="AccessCondition"/> object that represents the access conditions for the blob. If <c>null</c>, no condition is used.</param>
/// <param name="options">A <see cref="BlobRequestOptions"/> object that specifies additional options for the request.</param>
/// <returns>A <see cref="RESTCommand"/> that fetches the attributes.</returns>
private RESTCommand <ICloudBlob> GetBlobReferenceImpl(StorageUri blobUri, AccessCondition accessCondition, BlobRequestOptions options)
{
// If the blob Uri contains SAS credentials, we need to use those
// credentials instead of this service client's stored credentials.
StorageCredentials parsedCredentials;
DateTimeOffset? parsedSnapshot;
blobUri = NavigationHelper.ParseBlobQueryAndVerify(blobUri, out parsedCredentials, out parsedSnapshot);
CloudBlobClient client = parsedCredentials != null ? new CloudBlobClient(this.StorageUri, parsedCredentials) : this;
RESTCommand <ICloudBlob> getCmd = new RESTCommand <ICloudBlob>(client.Credentials, blobUri);
options.ApplyToStorageCommand(getCmd);
getCmd.CommandLocationMode = CommandLocationMode.PrimaryOrSecondary;
getCmd.BuildRequest = (cmd, uri, builder, cnt, serverTimeout, ctx) => BlobHttpRequestMessageFactory.GetProperties(uri, serverTimeout, parsedSnapshot, accessCondition, cnt, ctx, client.GetCanonicalizer(), client.Credentials);
getCmd.PreProcessResponse = (cmd, resp, ex, ctx) =>
{
HttpResponseParsers.ProcessExpectedStatusCodeNoException(HttpStatusCode.OK, resp, null /* retVal */, cmd, ex);
BlobAttributes attributes = new BlobAttributes()
{
StorageUri = blobUri,
SnapshotTime = parsedSnapshot,
};
CloudBlob.UpdateAfterFetchAttributes(attributes, resp);
switch (attributes.Properties.BlobType)
{
case BlobType.BlockBlob:
return(new CloudBlockBlob(attributes, client));
case BlobType.PageBlob:
return(new CloudPageBlob(attributes, client));
case BlobType.AppendBlob:
return(new CloudAppendBlob(attributes, client));
default:
throw new InvalidOperationException();
}
};
return(getCmd);
}
