PeerTube/server/middlewares/activitypub.ts

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import { eachSeries } from 'async'
import { NextFunction, Request, RequestHandler, Response } from 'express'
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import { ActivityPubSignature } from '../../shared'
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import { isSignatureVerified, logger } from '../helpers'
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import { database as db } from '../initializers'
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import { ACCEPT_HEADERS, ACTIVITY_PUB } from '../initializers/constants'
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import { fetchRemoteAccount, saveAccountAndServerIfNotExist } from '../lib/activitypub/account'
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async function checkSignature (req: Request, res: Response, next: NextFunction) {
const signatureObject: ActivityPubSignature = req.body.signature
logger.debug('Checking signature of account %s...', signatureObject.creator)
let account = await db.Account.loadByUrl(signatureObject.creator)
// We don't have this account in our database, fetch it on remote
if (!account) {
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account = await fetchRemoteAccount(signatureObject.creator)
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if (!account) {
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return res.sendStatus(403)
}
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// Save our new account and its server in database
await saveAccountAndServerIfNotExist(account)
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}
const verified = await isSignatureVerified(account, req.body)
if (verified === false) return res.sendStatus(403)
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res.locals.signature = {
account
}
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return next()
}
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function executeIfActivityPub (fun: RequestHandler | RequestHandler[]) {
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return (req: Request, res: Response, next: NextFunction) => {
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const accepted = req.accepts(ACCEPT_HEADERS)
if (accepted === false || ACTIVITY_PUB.POTENTIAL_ACCEPT_HEADERS.indexOf(accepted) === -1) {
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return next()
}
logger.debug('ActivityPub request for %s.', req.url)
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if (Array.isArray(fun) === true) {
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return eachSeries(fun as RequestHandler[], (f, cb) => {
f(req, res, cb)
}, next)
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}
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return (fun as RequestHandler)(req, res, next)
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}
}
// ---------------------------------------------------------------------------
export {
checkSignature,
executeIfActivityPub
}