ERS Dart client

This framework-neutral package provides version 1 envelope validation, typed channel parsing, connection lifecycle and recovery coordination, presence and typing helpers, and maintained HTTP and WebSocket adapters.

import 'package:egensolve_realtime/egensolve_realtime.dart';

final envelope = EnvelopeValidator.parse(rawEnvelopeJson);
final channel = AccountChannel(
  tenant: 'example',
  actorType: 'user',
  actorId: '42',
).toChannelString();

Remote HTTP and WebSocket endpoints must use encrypted transport. Plaintext connections are accepted only for loopback development hosts. Application backends remain responsible for user authentication and channel authorization.

Media and Artifacts (trusted Dart backends only)

Import media.dart, artifacts.dart, and http.dart for MediaClient, ArtifactsClient, and their HTTP response/error/transport types. Both clients accept baseUrl, a server-held machineCredential, an optional ApiTransport and a 1–30 second timeout.

Media supports upload intents, multipart part intents, completion, metadata, download grants and deletion. Artifacts supports creation, revision upload/completion, publishing a ready revision and withdrawal. These clients send version-1 JSON metadata, not file bytes. Your backend authorizes product users and gives them short-lived instructions for direct provider upload/download. Do not use machine credentials inside Flutter, browsers, mobile apps or widgets. Never log signed URLs or upload tokens. Preserve returned IDs exactly, including letter case.

Reuse an idempotency key only for retries of the same mutation. Inspect ApiResponse.data for provider instructions and readiness; completion acceptance alone does not imply readiness. Handle ApiException.httpStatus and code and back off on retryable failures. Publish an earlier ready revision to roll back an artifact.

License

MIT. See LICENSE.