server/middlewares/secure.ts


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import 'express-validator'
import * as express from 'express'

import { database as db } from '../initializers'
import {
  logger,
  checkSignature as peertubeCryptoCheckSignature
} from '../helpers'
import { PodSignature } from '../../shared'

function checkSignature (req: express.Request, res: express.Response, next: express.NextFunction) {
  const signatureObject: PodSignature = req.body.signature
  const host = signatureObject.host

  db.Pod.loadByHost(host)
    .then(pod => {
      if (pod === null) {
        logger.error('Unknown pod %s.', host)
        return res.sendStatus(403)
      }

      logger.debug('Checking signature from %s.', host)

      let signatureShouldBe
      // If there is data in the body the sender used it for its signature
      // If there is no data we just use its host as signature
      if (req.body.data) {
        signatureShouldBe = req.body.data
      } else {
        signatureShouldBe = host
      }

      const signatureOk = peertubeCryptoCheckSignature(pod.publicKey, signatureShouldBe, signatureObject.signature)

      if (signatureOk === true) {
        res.locals.secure = {
          pod
        }

        return next()
      }

      logger.error('Signature is not okay in body for %s.', signatureObject.host)
      return res.sendStatus(403)
    })
    .catch(err => {
      logger.error('Cannot get signed host in body.', { error: err.stack, signature: signatureObject.signature })
      return res.sendStatus(500)
    })
}

// ---------------------------------------------------------------------------

export {
  checkSignature
}