server/packages/protocol-translator/index.ts

import type { APActor, APNote } from "activitypub-types";
import { ActivityPubTranslator } from "./protocols/activitypub";

export enum SupportedProtocols {
	ACTIVITYPUB = "activitypub",
}

/**
 * ProtocolTranslator
 * @summary Translates between federation protocols such as ActivityPub to Lysand and back
 * @description This class is responsible for translating between federation protocols such as ActivityPub to Lysand and back.
 * This class is not meant to be instantiated directly, but rather for its children to be used.
 */
export class ProtocolTranslator {
	static auto(object: any) {
		const protocol = this.recognizeProtocol(object);
		switch (protocol) {
			case SupportedProtocols.ACTIVITYPUB:
				return new ActivityPubTranslator();
			default:
				throw new Error("Unknown protocol");
		}
	}

	/**
	 * Translates an ActivityPub actor to a Lysand user
	 * @param data Raw JSON-LD data from an ActivityPub actor
	 */
	user(data: APActor) {
		//
	}

	/**
	 * Translates an ActivityPub note to a Lysand status
	 * @param data Raw JSON-LD data from an ActivityPub note
	 */
	status(data: APNote) {
		//
	}

	/**
	 * Automatically recognizes the protocol of a given object
	 */
	private static recognizeProtocol(object: any) {
		// Temporary stub
		return SupportedProtocols.ACTIVITYPUB;
	}
}