/// <summary>
/// Decodes specific attributes from base64 to their binary representation.
/// </summary>
/// <param name="document"></param>
/// <param name="attributeNames"></param>
public static void DecodeBase64Attributes(Document document, params string[] attributeNames)
{
if (attributeNames == null || attributeNames.Length == 0)
{
return;
}
var decodedValues = new Dictionary <string, DynamoDBEntry>(StringComparer.Ordinal);
// Convert, but don't alter the original yet
foreach (var attributeName in attributeNames)
{
DynamoDBEntry entry;
// If an attribute is not present, do nothing
if (!document.TryGetValue(attributeName, out entry))
{
continue;
}
DynamoDBEntry decodedEntry;
if (!TryDecodeBase64(entry, out decodedEntry))
{
throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture,
"Unable to decode attribute {0} of type {1} in document", attributeName, entry.GetType().FullName));
}
decodedValues[attributeName] = decodedEntry;
}
// Update document with decoded attribute values
foreach (var kvp in decodedValues)
{
var attributeName = kvp.Key;
var decodedEntry = kvp.Value;
document[attributeName] = decodedEntry;
}
}