server/middlewares/validators/oembed.ts

   1 import { query } from 'express-validator/check'
   2 import * as express from 'express'
   3 import { join } from 'path'
   4
   5 import { checkErrors } from './utils'
   6 import { CONFIG } from '../../initializers'
   7 import {
   8   logger,
   9   isTestInstance,
  10   checkVideoExists,
  11   isIdOrUUIDValid
  12 } from '../../helpers'
  13
  14 const urlShouldStartWith = CONFIG.WEBSERVER.SCHEME + '://' + join(CONFIG.WEBSERVER.HOST, 'videos', 'watch') + '/'
  15 const videoWatchRegex = new RegExp('([^/]+)$')
  16 const isURLOptions = {
  17   require_host: true,
  18   require_tld: true
  19 }
  20
  21 // We validate 'localhost', so we don't have the top level domain
  22 if (isTestInstance()) {
  23   isURLOptions.require_tld = false
  24 }
  25
  26 const oembedValidator = [
  27   query('url').isURL(isURLOptions).withMessage('Should have a valid url'),
  28   query('maxwidth').optional().isInt().withMessage('Should have a valid max width'),
  29   query('maxheight').optional().isInt().withMessage('Should have a valid max height'),
  30   query('format').optional().isIn([ 'xml', 'json' ]).withMessage('Should have a valid format'),
  31
  32   (req: express.Request, res: express.Response, next: express.NextFunction) => {
  33     logger.debug('Checking oembed parameters', { parameters: req.query })
  34
  35     checkErrors(req, res, () => {
  36       if (req.query.format !== undefined && req.query.format !== 'json') {
  37         return res.status(501)
  38                   .json({ error: 'Requested format is not implemented on server.' })
  39                   .end()
  40       }
  41
  42       const startIsOk = req.query.url.startsWith(urlShouldStartWith)
  43       const matches = videoWatchRegex.exec(req.query.url)
  44       if (startIsOk === false || matches === null) {
  45         return res.status(400)
  46                   .json({ error: 'Invalid url.' })
  47                   .end()
  48       }
  49
  50       const videoId = matches[1]
  51       if (isIdOrUUIDValid(videoId) === false) {
  52         return res.status(400)
  53                   .json({ error: 'Invalid video id.' })
  54                   .end()
  55       }
  56
  57       checkVideoExists(videoId, res, next)
  58     })
  59   }
  60 ]
  61
  62 // ---------------------------------------------------------------------------
  63
  64 export {
  65   oembedValidator
  66 }