iceshrimp/packages/backend/src/remote/activitypub/renderer/index.ts

import { v4 as uuid } from "uuid";
import config from "@/config/index.js";
import { getUserKeypair } from "@/misc/keypair-store.js";
import type { User } from "@/models/entities/user.js";
import { LdSignature } from "../misc/ld-signature.js";
import type { IActivity } from "../type.js";
import { WellKnownContext } from "@/remote/activitypub/misc/contexts.js";

export const renderActivity = (x: any): IActivity | null => {
	if (x == null) return null;

	if (typeof x === "object" && x.id == null) {
		x.id = `${config.url}/${uuid()}`;
	}

	return Object.assign({}, WellKnownContext, x);
};

export const attachLdSignature = async (
	activity: any,
	user: { id: User["id"]; host: null },
): Promise<IActivity | null> => {
	if (activity == null) return null;

	const keypair = await getUserKeypair(user.id);

	const ldSignature = new LdSignature();
	ldSignature.debug = false;
	activity = await ldSignature.signRsaSignature2017(
		activity,
		keypair.privateKey,
		`${config.url}/users/${user.id}#main-key`,
	);

	return activity;
};