server/controllers/client.ts

   1 import { parallel } from 'async'
   2 import * as express from 'express'
   3 import * as fs from 'fs'
   4 import { join } from 'path'
   5 import * as validator from 'validator'
   6
   7 import { database as db } from '../initializers/database'
   8 import {
   9   CONFIG,
  10   REMOTE_SCHEME,
  11   STATIC_PATHS,
  12   STATIC_MAX_AGE
  13 } from '../initializers'
  14 import { root } from '../helpers'
  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, res, next) {
  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, res, next) {
  37   res.sendStatus(404)
  38 })
  39
  40 // ---------------------------------------------------------------------------
  41
  42 export {
  43   clientsRouter
  44 }
  45
  46 // ---------------------------------------------------------------------------
  47
  48 function addOpenGraphTags (htmlStringPage, video) {
  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, res, next) {
  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   parallel({
  98     file: function (callback) {
  99       fs.readFile(indexPath, callback)
 100     },
 101
 102     video: function (callback) {
 103       db.Video.loadAndPopulateAuthorAndPodAndTags(videoId, callback)
 104     }
 105   }, function (err, result: any) {
 106     if (err) return next(err)
 107
 108     const html = result.file.toString()
 109     const video = result.video
 110
 111     // Let Angular application handle errors
 112     if (!video) return res.sendFile(indexPath)
 113
 114     const htmlStringPageWithTags = addOpenGraphTags(html, video)
 115     res.set('Content-Type', 'text/html; charset=UTF-8').send(htmlStringPageWithTags)
 116   })
 117 }