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