server/controllers/client.ts

   1 import * as express from 'express'
   2 import { join } from 'path'
   3 import * as validator from 'validator'
   4 import * as Bluebird from 'bluebird'
   5
   6 import { database as db } from '../initializers/database'
   7 import {
   8   CONFIG,
   9   STATIC_PATHS,
  10   STATIC_MAX_AGE,
  11   OPENGRAPH_AND_OEMBED_COMMENT
  12 } from '../initializers'
  13 import { root, readFileBufferPromise, escapeHTML } from '../helpers'
  14 import { asyncMiddleware } from '../middlewares'
  15 import { VideoInstance } from '../models'
  16
  17 const clientsRouter = express.Router()
  18
  19 const distPath = join(root(), 'client', 'dist')
  20 const embedPath = join(distPath, 'standalone', 'videos', 'embed.html')
  21 const indexPath = join(distPath, 'index.html')
  22
  23 // Special route that add OpenGraph and oEmbed tags
  24 // Do not use a template engine for a so little thing
  25 clientsRouter.use('/videos/watch/:id',
  26   asyncMiddleware(generateWatchHtmlPage)
  27 )
  28
  29 clientsRouter.use('/videos/embed', (req: express.Request, res: express.Response, next: express.NextFunction) => {
  30   res.sendFile(embedPath)
  31 })
  32
  33 // Static HTML/CSS/JS client files
  34 clientsRouter.use('/client', express.static(distPath, { maxAge: STATIC_MAX_AGE }))
  35
  36 // 404 for static files not found
  37 clientsRouter.use('/client/*', (req: express.Request, res: express.Response, next: express.NextFunction) => {
  38   res.sendStatus(404)
  39 })
  40
  41 // ---------------------------------------------------------------------------
  42
  43 export {
  44   clientsRouter
  45 }
  46
  47 // ---------------------------------------------------------------------------
  48
  49 function addOpenGraphAndOEmbedTags (htmlStringPage: string, video: VideoInstance) {
  50   const previewUrl = CONFIG.WEBSERVER.URL + STATIC_PATHS.PREVIEWS + video.getPreviewName()
  51   const videoUrl = CONFIG.WEBSERVER.URL + '/videos/watch/' + video.uuid
  52
  53   const videoName = escapeHTML(video.name)
  54   const videoDescription = escapeHTML(video.description)
  55
  56   const openGraphMetaTags = {
  57     'og:type': 'video',
  58     'og:title': videoName,
  59     'og:image': previewUrl,
  60     'og:url': videoUrl,
  61     'og:description': videoDescription,
  62
  63     'name': videoName,
  64     'description': videoDescription,
  65     'image': previewUrl,
  66
  67     'twitter:card': 'summary_large_image',
  68     'twitter:site': '@Chocobozzz',
  69     'twitter:title': videoName,
  70     'twitter:description': videoDescription,
  71     'twitter:image': previewUrl
  72   }
  73
  74   const oembedLinkTags = [
  75     {
  76       type: 'application/json+oembed',
  77       href: CONFIG.WEBSERVER.URL + '/services/oembed?url=' + encodeURIComponent(videoUrl),
  78       title: videoName
  79     }
  80   ]
  81
  82   let tagsString = ''
  83   Object.keys(openGraphMetaTags).forEach(tagName => {
  84     const tagValue = openGraphMetaTags[tagName]
  85
  86     tagsString += `<meta property="${tagName}" content="${tagValue}" />`
  87   })
  88
  89   for (const oembedLinkTag of oembedLinkTags) {
  90     tagsString += `<link rel="alternate" type="${oembedLinkTag.type}" href="${oembedLinkTag.href}" title="${oembedLinkTag.title}" />`
  91   }
  92
  93   return htmlStringPage.replace(OPENGRAPH_AND_OEMBED_COMMENT, tagsString)
  94 }
  95
  96 async function generateWatchHtmlPage (req: express.Request, res: express.Response, next: express.NextFunction) {
  97   const videoId = '' + req.params.id
  98   let videoPromise: Bluebird<VideoInstance>
  99
 100   // Let Angular application handle errors
 101   if (validator.isUUID(videoId, 4)) {
 102     videoPromise = db.Video.loadByUUIDAndPopulateAuthorAndPodAndTags(videoId)
 103   } else if (validator.isInt(videoId)) {
 104     videoPromise = db.Video.loadAndPopulateAuthorAndPodAndTags(+videoId)
 105   } else {
 106     return res.sendFile(indexPath)
 107   }
 108
 109   let [ file, video ] = await Promise.all([
 110     readFileBufferPromise(indexPath),
 111     videoPromise
 112   ])
 113
 114   file = file as Buffer
 115   video = video as VideoInstance
 116
 117   const html = file.toString()
 118
 119   // Let Angular application handle errors
 120   if (!video) return res.sendFile(indexPath)
 121
 122   const htmlStringPageWithTags = addOpenGraphAndOEmbedTags(html, video)
 123   res.set('Content-Type', 'text/html; charset=UTF-8').send(htmlStringPageWithTags)
 124 }