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 } from '../initializers'
  13 import { root, readFileBufferPromise } from '../helpers'
  14 import { VideoInstance } from '../models'
  15
  16 const clientsRouter = express.Router()
  17
  18 // TODO: move to constants
  19 const opengraphComment = '<!-- opengraph tags -->'
  20 const distPath = join(root(), 'client', 'dist')
  21 const embedPath = join(distPath, 'standalone', 'videos', 'embed.html')
  22 const indexPath = join(distPath, 'index.html')
  23
  24 // Special route that add OpenGraph tags
  25 // Do not use a template engine for a so little thing
  26 clientsRouter.use('/videos/watch/:id', generateWatchHtmlPage)
  27
  28 clientsRouter.use('/videos/embed', function (req: express.Request, res: express.Response, next: express.NextFunction) {
  29   res.sendFile(embedPath)
  30 })
  31
  32 // Static HTML/CSS/JS client files
  33 clientsRouter.use('/client', express.static(distPath, { maxAge: STATIC_MAX_AGE }))
  34
  35 // 404 for static files not found
  36 clientsRouter.use('/client/*', function (req: express.Request, res: express.Response, next: express.NextFunction) {
  37   res.sendStatus(404)
  38 })
  39
  40 // ---------------------------------------------------------------------------
  41
  42 export {
  43   clientsRouter
  44 }
  45
  46 // ---------------------------------------------------------------------------
  47
  48 function addOpenGraphTags (htmlStringPage: string, video: VideoInstance) {
  49   let basePreviewUrlHttp
  50
  51   if (video.isOwned()) {
  52     basePreviewUrlHttp = CONFIG.WEBSERVER.URL
  53   } else {
  54     basePreviewUrlHttp = REMOTE_SCHEME.HTTP + '://' + video.Author.Pod.host
  55   }
  56
  57   // We fetch the remote preview (bigger than the thumbnail)
  58   // This should not overhead the remote server since social websites put in a cache the OpenGraph tags
  59   // We can't use the thumbnail because these social websites want bigger images (> 200x200 for Facebook for example)
  60   const previewUrl = basePreviewUrlHttp + STATIC_PATHS.PREVIEWS + video.getPreviewName()
  61   const videoUrl = CONFIG.WEBSERVER.URL + '/videos/watch/' + video.id
  62
  63   const metaTags = {
  64     'og:type': 'video',
  65     'og:title': video.name,
  66     'og:image': previewUrl,
  67     'og:url': videoUrl,
  68     'og:description': video.description,
  69
  70     'name': video.name,
  71     'description': video.description,
  72     'image': previewUrl,
  73
  74     'twitter:card': 'summary_large_image',
  75     'twitter:site': '@Chocobozzz',
  76     'twitter:title': video.name,
  77     'twitter:description': video.description,
  78     'twitter:image': previewUrl
  79   }
  80
  81   let tagsString = ''
  82   Object.keys(metaTags).forEach(function (tagName) {
  83     const tagValue = metaTags[tagName]
  84
  85     tagsString += '<meta property="' + tagName + '" content="' + tagValue + '" />'
  86   })
  87
  88   return htmlStringPage.replace(opengraphComment, tagsString)
  89 }
  90
  91 function generateWatchHtmlPage (req: express.Request, res: express.Response, next: express.NextFunction) {
  92   const videoId = '' + req.params.id
  93
  94   // Let Angular application handle errors
  95   if (!validator.isUUID(videoId, 4)) return res.sendFile(indexPath)
  96
  97   Promise.all([
  98     readFileBufferPromise(indexPath),
  99     db.Video.loadAndPopulateAuthorAndPodAndTags(videoId)
 100   ])
 101   .then(([ file, video ]) => {
 102     file = file as Buffer
 103     video = video as VideoInstance
 104
 105     const html = file.toString()
 106
 107     // Let Angular application handle errors
 108     if (!video) return res.sendFile(indexPath)
 109
 110     const htmlStringPageWithTags = addOpenGraphTags(html, video)
 111     res.set('Content-Type', 'text/html; charset=UTF-8').send(htmlStringPageWithTags)
 112   })
 113   .catch(err => next(err))
 114 }