shadowfacts.net/lib/activitypub/articles.ts

import express, { Router, Request, Response } from "express";
import { Page, PostMetadata } from "../metadata";
import { Article } from "./activity";
import { Database } from "sqlite3";
import uuidv4 from "uuid/v4";

const domain = process.env.DOMAIN;

export async function setup(posts: Page[], db: Database) {
	for (const post of posts) {
		const postMeta = <PostMetadata>post.metadata;
		const articleObject = {
			"@context": [
				"https://www.w3.org/ns/activitystreams",
			],
			"type": "Article",
			"id": `https://${domain}${post.metadata.permalink}`,
			"published": (<Date>postMeta.date).toISOString(),
			"inReplyTo": null,
			"conversation": `https://${domain}/ap/conversation/${uuidv4()}`,
			"url": `https://${domain}${postMeta.permalink}`,
			"attributedTo": `https://${domain}/ap/actor`,
			"to": [
				"https://www.w3.org/ns/activitystreams#Public"
			],
			"cc": [
				`https://${domain}/ap/actor/followers`
			],
			"name": postMeta.title,
			"content": post.text
		};
		db.run("INSERT OR IGNORE INTO articles(id, article_doc, conversation, has_federated) VALUES($id, $article_doc, $conversation, $has_federated)", {
			$id: postMeta.permalink,
			$article_doc: JSON.stringify(articleObject),
			$conversation: articleObject.conversation,
			$has_federated: 0
		}, (err) => {
			if (err) console.log(`Encountered error inserting article ${postMeta.permalink}`, err);
		});
	}
}

export async function toFederate(db: Database): Promise<[string, Article][]> {
	return new Promise((resolve, reject) => {
		db.all("SELECT id, article_doc FROM articles WHERE has_federated = $has_federated", {
			$has_federated: 0
		}, (err, rows) => {
			if (err) reject(err);
			else {
				let result: [string, Article][] = [];
				for (const row of rows) {
					result.push([row.id, JSON.parse(row.article_doc)]);
				}
				resolve(result);
			}
		});
	});
}

export function route(router: Router) {
	router.use("/:category/:year/:slug/", (req, res, next) => {
		const best = req.accepts(["text/html", "application/activity+json"]);
		console.log(best);
		if (best === "text/html") {
			next();
		} else if (best === "application/activity+json") {
			const db = <Database>req.app.get("db")
			db.get("SELECT article_doc FROM articles WHERE id = $id", {
				$id: `/${req.params.category}/${req.params.year}/${req.params.slug}/`
			}, (err, result) => {
				if (err) {
					res.status(500).end(err);
					return;
				}
				res.type("application/activity+json");
				res.end(result.article_doc);
			});
		} else {
			res.status(415).end("No acceptable content-type given. text/html or application/activity+json are supported");
		}
	});
}