Messaging Service

Goal

Build an open messaging canister that can be integrated in different frontends, eg. Plug, Stoic, OpenChat, DSCVR. The data format should be structured but extensible.

Specification

The initial prototype can be a single canister. Increased canister storage will enable this to scale without too much extra effort.

Example interface:

public type Data = {
  id: ?Nat;
  recipient: Principal;
  sender: Principal;
  title: Text;
  data: Blob;
};

public type MessagingService = actor {
  // Deliver a message from caller to recipient
  send : shared (Data) -> async ();

  // Retrieve all messages for caller
  getAll : shared () -> async [Data];

  // Delete messages by id for caller
  remove : shared ([Nat]) -> async ();
};

Notes

• Need to prevent spam - perhaps use proof-of-work from II
• Extending the data model with an isRead flag to enable a "mark as read" feature could be useful