server/controllers/client.ts

   1 import * as express from 'express'
   2 import { join } from 'path'
   3 import * as validator from 'validator'
   4 import * as Promise from 'bluebird'
   5
   6 import { database as db } from '../initializers/database'
   7 import {
   8   CONFIG,
   9   REMOTE_SCHEME,
  10   STATIC_PATHS,
  11   STATIC_MAX_AGE,
  12   OPENGRAPH_COMMENT
  13 } from '../initializers'
  14 import { root, readFileBufferPromise } from '../helpers'
  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 tags
  24 // Do not use a template engine for a so little thing
  25 clientsRouter.use('/videos/watch/:id', generateWatchHtmlPage)
  26
  27 clientsRouter.use('/videos/embed', function (req: express.Request, res: express.Response, next: express.NextFunction) {
  28   res.sendFile(embedPath)
  29 })
  30
  31 // Static HTML/CSS/JS client files
  32 clientsRouter.use('/client', express.static(distPath, { maxAge: STATIC_MAX_AGE }))
  33
  34 // 404 for static files not found
  35 clientsRouter.use('/client/*', function (req: express.Request, res: express.Response, next: express.NextFunction) {
  36   res.sendStatus(404)
  37 })
  38
  39 // ---------------------------------------------------------------------------
  40
  41 export {
  42   clientsRouter
  43 }
  44
  45 // ---------------------------------------------------------------------------
  46
  47 function addOpenGraphTags (htmlStringPage: string, video: VideoInstance) {
  48   let basePreviewUrlHttp
  49
  50   if (video.isOwned()) {
  51     basePreviewUrlHttp = CONFIG.WEBSERVER.URL
  52   } else {
  53     basePreviewUrlHttp = REMOTE_SCHEME.HTTP + '://' + video.Author.Pod.host
  54   }
  55
  56   // We fetch the remote preview (bigger than the thumbnail)
  57   // This should not overhead the remote server since social websites put in a cache the OpenGraph tags
  58   // We can't use the thumbnail because these social websites want bigger images (> 200x200 for Facebook for example)
  59   const previewUrl = basePreviewUrlHttp + STATIC_PATHS.PREVIEWS + video.getPreviewName()
  60   const videoUrl = CONFIG.WEBSERVER.URL + '/videos/watch/' + video.id
  61
  62   const metaTags = {
  63     'og:type': 'video',
  64     'og:title': video.name,
  65     'og:image': previewUrl,
  66     'og:url': videoUrl,
  67     'og:description': video.description,
  68
  69     'name': video.name,
  70     'description': video.description,
  71     'image': previewUrl,
  72
  73     'twitter:card': 'summary_large_image',
  74     'twitter:site': '@Chocobozzz',
  75     'twitter:title': video.name,
  76     'twitter:description': video.description,
  77     'twitter:image': previewUrl
  78   }
  79
  80   let tagsString = ''
  81   Object.keys(metaTags).forEach(function (tagName) {
  82     const tagValue = metaTags[tagName]
  83
  84     tagsString += '<meta property="' + tagName + '" content="' + tagValue + '" />'
  85   })
  86
  87   return htmlStringPage.replace(OPENGRAPH_COMMENT, tagsString)
  88 }
  89
  90 function generateWatchHtmlPage (req: express.Request, res: express.Response, next: express.NextFunction) {
  91   const videoId = '' + req.params.id
  92
  93   // Let Angular application handle errors
  94   if (!validator.isUUID(videoId, 4)) return res.sendFile(indexPath)
  95
  96   Promise.all([
  97     readFileBufferPromise(indexPath),
  98     db.Video.loadAndPopulateAuthorAndPodAndTags(videoId)
  99   ])
 100   .then(([ file, video ]) => {
 101     file = file as Buffer
 102     video = video as VideoInstance
 103
 104     const html = file.toString()
 105
 106     // Let Angular application handle errors
 107     if (!video) return res.sendFile(indexPath)
 108
 109     const htmlStringPageWithTags = addOpenGraphTags(html, video)
 110     res.set('Content-Type', 'text/html; charset=UTF-8').send(htmlStringPageWithTags)
 111   })
 112   .catch(err => next(err))
 113 }