shadowfacts.net/lib/generate/activitypub.ts

import path from "path";
import { Page, PostMetadata } from "../metadata";
import * as util from "../util";

const baseURL = process.env.BASE_URL || "shadowfacts.net";

export default async function activitypub(posts: Page[]) {
	for (const post of posts) {
		const object = postObject(post);
		const dir = path.dirname(post.metadata.permalink);
		const base = path.basename(post.metadata.permalink);
		const dest = path.format({
			dir,
			name: base,
			ext: ".json"
		});
		const data = JSON.stringify(object);
		util.write(dest, data);
		util.write(path.join(post.metadata.permalink, "index.html.json"), data);
	}

	util.write(".well-known/webfinger", JSON.stringify(webfingerObject()));
}

function postObject(post: Page): object {
	const postMeta = <PostMetadata>post.metadata;
	return {
		"@context": [
			"https://www.w3.org/ns/activitystreams"
		],
		"type": "Article",
		"id": `https://${baseURL}${post.metadata.permalink}`,
		"published": (<Date>postMeta.date).toISOString(),
		"inReplyTo": null,
		"url": `https://${baseURL}${postMeta.permalink}`,
		"attributedTo": `https://${baseURL}/ap/actor`,
		"to": [
			"https://www.w3.org/ns/activitystreams#Public"
		],
		"cc": [
			`https://${baseURL}/ap/followers`
		],
		"name": postMeta.title,
		"content": post.text
	};
}

function webfingerObject() {
	return {
		"subject": `acct:shadowfacts@${baseURL}`,
		"links": [
			{
				"rel": "self",
				"type": "application/activity+json",
				"href": `https://${baseURL}/ap/actor`
			}
		]
	};
}