middlewares/misc.js

   1 ;(function () {
   2   'use strict'
   3
   4   var fs = require('fs')
   5   var ursa = require('ursa')
   6
   7   var logger = require('../helpers/logger')
   8   var PodsDB = require('../initializers/database').PodsDB
   9   var utils = require('../helpers/utils')
  10
  11   var miscMiddleware = {
  12     cache: cache,
  13     decryptBody: decryptBody
  14   }
  15
  16   function cache (cache) {
  17     return function (req, res, next) {
  18       // If we want explicitly a cache
  19       // Or if we don't specify if we want a cache or no and we are in production
  20       if (cache === true || (cache !== false && process.env.NODE_ENV === 'production')) {
  21         res.setHeader('Cache-Control', 'public')
  22       } else {
  23         res.setHeader('Cache-Control', 'no-cache, no-store, max-age=0, must-revalidate')
  24       }
  25
  26       next()
  27     }
  28   }
  29
  30   function decryptBody (req, res, next) {
  31     PodsDB.findOne({ url: req.body.signature.url }, function (err, pod) {
  32       if (err) {
  33         logger.error('Cannot get signed url in decryptBody.', { error: err })
  34         return res.sendStatus(500)
  35       }
  36
  37       if (pod === null) {
  38         logger.error('Unknown pod %s.', req.body.signature.url)
  39         return res.sendStatus(403)
  40       }
  41
  42       logger.debug('Decrypting body from %s.', req.body.signature.url)
  43
  44       var crt = ursa.createPublicKey(pod.publicKey)
  45       var signature_ok = crt.hashAndVerify('sha256', new Buffer(req.body.signature.url).toString('hex'), req.body.signature.signature, 'hex')
  46
  47       if (signature_ok === true) {
  48         var myKey = ursa.createPrivateKey(fs.readFileSync(utils.getCertDir() + 'peertube.key.pem'))
  49         var decryptedKey = myKey.decrypt(req.body.key, 'hex', 'utf8')
  50         req.body.data = JSON.parse(utils.symetricDecrypt(req.body.data, decryptedKey))
  51         delete req.body.key
  52       } else {
  53         logger.error('Signature is not okay in decryptBody for %s.', req.body.signature.url)
  54         return res.sendStatus(403)
  55       }
  56
  57       next()
  58     })
  59   }
  60
  61   // ---------------------------------------------------------------------------
  62
  63   module.exports = miscMiddleware
  64 })()