shadowfacts.net/lib/activitypub/inbox.ts

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import { Router, Request, Response } from "express";
import uuidv4 from "uuid/v4";
import { fetchActor, signAndSend } from "./federate";
import { Activity, Follow, Accept, Undo, Create, Note } from "./activity";
import { Database } from "sqlite3";
import { URL } from "url";
const domain = process.env.DOMAIN;
export default function inbox(): Router {
const router = Router();
router.post("/ap/inbox", handleInbox);
router.post("/inbox", handleInbox);
return router;
}
async function handleInbox(req: Request, res: Response) {
console.log(req.body);
const activity = req.body as Activity;
if (activity.type === "Follow") {
handleFollow(activity, req, res);
} else if (activity.type === "Create") {
handleCreate(activity, req, res);
} else if (activity.type === "Undo") {
handleUndo(activity, req, res);
} else {
res.end(); // TODO: handle this better
}
}
async function handleFollow(activity: Activity, req: Request, res: Response) {
if (typeof req.body.object !== "string") {
res.end(); // TODO: handle this better
return;
}
const follow = activity as Follow;
if (follow.object !== `https://${domain}/ap/actor`) {
res.end();
return;
}
const actor = await fetchActor(follow.actor);
const acceptObject = <Accept>{
"@context": [
"https://www.w3.org/ns/activitystreams",
// "https://w3id.org/security/v1"
],
"id": `https://${domain}/ap/${uuidv4()}`,
"type": "Accept",
"actor": `https://${domain}/ap/actor`,
"object": follow
};
signAndSend(acceptObject, actor.inbox);
const db = req.app.get("db") as Database;
const serverInbox = new URL("/inbox", actor.inbox).toString();
db.run("INSERT OR IGNORE INTO followers(id, inbox) VALUES($id, $inbox)", {
$id: actor.id,
$inbox: serverInbox
}, (err) => {
if (err) console.error(`Encountered error adding follower ${follow.actor}`, err);
});
res.end();
}
async function handleCreate(activity: Activity, req: Request, res: Response) {
const create = activity as Create;
if (create.object.type == "Note") {
handleCreateNote(create, req, res);
} else {
res.end();
}
}
async function handleCreateNote(create: Create, req: Request, res: Response) {
const note = create.object as Note;
console.log(note);
}
async function handleUndo(activity: Activity, req: Request, res: Response) {
const undo = activity as Undo;
if (undo.object.type === "Follow") {
handleUndoFollow(undo, req, res);
} else {
res.end();
}
}
async function handleUndoFollow(undo: Undo, req: Request, res: Response) {
const follow = undo.object as Follow;
if (follow.object !== `https://${domain}/ap/actor`) {
res.end();
return;
}
const db = req.app.get("db") as Database;
db.run("DELETE FROM followers WHERE id = $id", {
$id: follow.actor
}, (err) => {
if (err) console.error(`Error unfollowing ${follow.actor}`, err);
});
res.end();
}