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import { NextFunction, Request, Response } from 'express'
import { ActivityPubSignature } from '../../shared'
import { logger } from '../helpers/logger'
import { isHTTPSignatureVerified, isJsonLDSignatureVerified, parseHTTPSignature } from '../helpers/peertube-crypto'
import { ACCEPT_HEADERS, ACTIVITY_PUB, HTTP_SIGNATURE } from '../initializers/constants'
import { getOrCreateActorAndServerAndModel } from '../lib/activitypub'
import { loadActorUrlOrGetFromWebfinger } from '../helpers/webfinger'
async function checkSignature (req: Request, res: Response, next: NextFunction) {
try {
const httpSignatureChecked = await checkHttpSignature(req, res)
if (httpSignatureChecked !== true) return
const actor = res.locals.signature.actor
// Forwarded activity
const bodyActor = req.body.actor
const bodyActorId = bodyActor && bodyActor.id ? bodyActor.id : bodyActor
if (bodyActorId && bodyActorId !== actor.url) {
const jsonLDSignatureChecked = await checkJsonLDSignature(req, res)
if (jsonLDSignatureChecked !== true) return
}
return next()
} catch (err) {
logger.error('Error in ActivityPub signature checker.', err)
return res.sendStatus(403)
}
}
function executeIfActivityPub (req: Request, res: Response, next: NextFunction) {
const accepted = req.accepts(ACCEPT_HEADERS)
if (accepted === false || ACTIVITY_PUB.POTENTIAL_ACCEPT_HEADERS.indexOf(accepted) === -1) {
// Bypass this route
return next('route')
}
logger.debug('ActivityPub request for %s.', req.url)
return next()
}
// ---------------------------------------------------------------------------
export {
checkSignature,
executeIfActivityPub,
checkHttpSignature
}
// ---------------------------------------------------------------------------
async function checkHttpSignature (req: Request, res: Response) {
// FIXME: mastodon does not include the Signature scheme
const sig = req.headers[HTTP_SIGNATURE.HEADER_NAME] as string
if (sig && sig.startsWith('Signature ') === false) req.headers[HTTP_SIGNATURE.HEADER_NAME] = 'Signature ' + sig
const parsed = parseHTTPSignature(req)
const keyId = parsed.keyId
if (!keyId) {
res.sendStatus(403)
return false
}
logger.debug('Checking HTTP signature of actor %s...', keyId)
let [ actorUrl ] = keyId.split('#')
if (actorUrl.startsWith('acct:')) {
actorUrl = await loadActorUrlOrGetFromWebfinger(actorUrl.replace(/^acct:/, ''))
}
const actor = await getOrCreateActorAndServerAndModel(actorUrl)
const verified = isHTTPSignatureVerified(parsed, actor)
if (verified !== true) {
logger.warn('Signature from %s is invalid', actorUrl, { parsed })
res.sendStatus(403)
return false
}
res.locals.signature = { actor }
return true
}
async function checkJsonLDSignature (req: Request, res: Response) {
const signatureObject: ActivityPubSignature = req.body.signature
if (!signatureObject || !signatureObject.creator) {
res.sendStatus(403)
return false
}
const [ creator ] = signatureObject.creator.split('#')
logger.debug('Checking JsonLD signature of actor %s...', creator)
const actor = await getOrCreateActorAndServerAndModel(creator)
const verified = await isJsonLDSignatureVerified(actor, req.body)
if (verified !== true) {
res.sendStatus(403)
return false
}
res.locals.signature = { actor }
return true
}
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