Encode and decode continuation token values for stateless pagination APIs.

Continuation data is a free-form Map that is:

• encoded as JSON String
• encoded as UTF-8 bytes
• XOR-d with a given bytes of secret (optional)
• encoded as BASE-64 String

Usage

A simple usage example:

import 'package:continuation_token/continuation_token.dart';

main() {
  final codec = jsonMapContinuationCodec(secret: 'my-secret');

  final token = codec.encode({'id': 'abc123', 'asc': true});
  print(token); // FltEF0dZUAQWDkgfQEdPUAQHDlsXBxcWFxg

  final data = codec.decode(token);
  print(data); // {id: abc123, asc: true}
}