PeerTube/server/middlewares/validators/feeds.ts

import * as express from 'express'
import { param, query } from 'express-validator'
import { isIdOrUUIDValid, isIdValid } from '../../helpers/custom-validators/misc'
import { logger } from '../../helpers/logger'
import { areValidationErrors } from './utils'
import { isValidRSSFeed } from '../../helpers/custom-validators/feeds'
import { doesVideoExist } from '../../helpers/middlewares/videos'
import {
  doesAccountIdExist,
  doesAccountNameWithHostExist,
  doesVideoChannelIdExist,
  doesVideoChannelNameWithHostExist,
  doesUserFeedTokenCorrespond
} from '../../helpers/middlewares'

const feedsFormatValidator = [
  param('format').optional().custom(isValidRSSFeed).withMessage('Should have a valid format (rss, atom, json)'),
  query('format').optional().custom(isValidRSSFeed).withMessage('Should have a valid format (rss, atom, json)')
]

function setFeedFormatContentType (req: express.Request, res: express.Response, next: express.NextFunction) {
  const format = req.query.format || req.params.format || 'rss'

  let acceptableContentTypes: string[]
  if (format === 'atom' || format === 'atom1') {
    acceptableContentTypes = [ 'application/atom+xml', 'application/xml', 'text/xml' ]
  } else if (format === 'json' || format === 'json1') {
    acceptableContentTypes = [ 'application/json' ]
  } else if (format === 'rss' || format === 'rss2') {
    acceptableContentTypes = [ 'application/rss+xml', 'application/xml', 'text/xml' ]
  } else {
    acceptableContentTypes = [ 'application/xml', 'text/xml' ]
  }

  if (req.accepts(acceptableContentTypes)) {
    res.set('Content-Type', req.accepts(acceptableContentTypes) as string)
  } else {
    return res.status(406).send({
      message: `You should accept at least one of the following content-types: ${acceptableContentTypes.join(', ')}`
    }).end()
  }

  return next()
}

const videoFeedsValidator = [
  query('accountId').optional().custom(isIdValid),
  query('accountName').optional(),
  query('videoChannelId').optional().custom(isIdValid),
  query('videoChannelName').optional(),

  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
    logger.debug('Checking feeds parameters', { parameters: req.query })

    if (areValidationErrors(req, res)) return

    if (req.query.accountId && !await doesAccountIdExist(req.query.accountId, res)) return
    if (req.query.videoChannelId && !await doesVideoChannelIdExist(req.query.videoChannelId, res)) return
    if (req.query.accountName && !await doesAccountNameWithHostExist(req.query.accountName, res)) return
    if (req.query.videoChannelName && !await doesVideoChannelNameWithHostExist(req.query.videoChannelName, res)) return

    return next()
  }
]

const videoSubscriptonFeedsValidator = [
  query('accountId').optional().custom(isIdValid),
  query('token').optional(),

  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
    logger.debug('Checking feeds parameters', { parameters: req.query })

    if (areValidationErrors(req, res)) return

    // a token alone is erroneous
    if (req.query.token && !req.query.accountId) return
    if (req.query.token && !await doesUserFeedTokenCorrespond(res.locals.account.userId, req.query.token, res)) return

    return next()
  }
]

const videoCommentsFeedsValidator = [
  query('videoId').optional().custom(isIdOrUUIDValid),

  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
    logger.debug('Checking feeds parameters', { parameters: req.query })

    if (areValidationErrors(req, res)) return

    if (req.query.videoId && (req.query.videoChannelId || req.query.videoChannelName)) {
      return res.status(400).send({
        message: 'videoId cannot be mixed with a channel filter'
      }).end()
    }

    if (req.query.videoId && !await doesVideoExist(req.query.videoId, res)) return

    return next()
  }
]

// ---------------------------------------------------------------------------

export {
  feedsFormatValidator,
  setFeedFormatContentType,
  videoFeedsValidator,
  videoSubscriptonFeedsValidator,
  videoCommentsFeedsValidator
}