server/middlewares/validators/oembed.ts

   1 import * as express from 'express'
   2 import { query } from 'express-validator/check'
   3 import { join } from 'path'
   4 import { isTestInstance, logger } from '../../helpers'
   5 import { isIdOrUUIDValid } from '../../helpers/custom-validators/misc'
   6 import { isVideoExist } from '../../helpers/custom-validators/videos'
   7 import { CONFIG } from '../../initializers'
   8 import { areValidationErrors } from './utils'
   9
  10 const urlShouldStartWith = CONFIG.WEBSERVER.SCHEME + '://' + join(CONFIG.WEBSERVER.HOST, 'videos', 'watch') + '/'
  11 const videoWatchRegex = new RegExp('([^/]+)$')
  12 const isURLOptions = {
  13   require_host: true,
  14   require_tld: true
  15 }
  16
  17 // We validate 'localhost', so we don't have the top level domain
  18 if (isTestInstance()) {
  19   isURLOptions.require_tld = false
  20 }
  21
  22 const oembedValidator = [
  23   query('url').isURL(isURLOptions).withMessage('Should have a valid url'),
  24   query('maxwidth').optional().isInt().withMessage('Should have a valid max width'),
  25   query('maxheight').optional().isInt().withMessage('Should have a valid max height'),
  26   query('format').optional().isIn([ 'xml', 'json' ]).withMessage('Should have a valid format'),
  27
  28   async (req: express.Request, res: express.Response, next: express.NextFunction) => {
  29     logger.debug('Checking oembed parameters', { parameters: req.query })
  30
  31     if (areValidationErrors(req, res)) return
  32
  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 (isIdOrUUIDValid(videoId) === false) {
  49       return res.status(400)
  50                 .json({ error: 'Invalid video id.' })
  51                 .end()
  52     }
  53
  54     if (!await isVideoExist(videoId, res)) return
  55
  56     return next()
  57   }
  58 ]
  59
  60 // ---------------------------------------------------------------------------
  61
  62 export {
  63   oembedValidator
  64 }