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