server/controllers/client.js

   1 'use strict'
   2
   3 const parallel = require('async/parallel')
   4 const express = require('express')
   5 const fs = require('fs')
   6 const path = require('path')
   7 const validator = require('express-validator').validator
   8
   9 const constants = require('../initializers/constants')
  10 const db = require('../initializers/database')
  11
  12 const router = express.Router()
  13
  14 const opengraphComment = '<!-- opengraph tags -->'
  15 const distPath = path.join(__dirname, '..', '..', 'client/dist')
  16 const embedPath = path.join(distPath, 'standalone/videos/embed.html')
  17 const indexPath = path.join(distPath, 'index.html')
  18
  19 // Special route that add OpenGraph tags
  20 // Do not use a template engine for a so little thing
  21 router.use('/videos/watch/:id', generateWatchHtmlPage)
  22
  23 router.use('/videos/embed', function (req, res, next) {
  24   res.sendFile(embedPath)
  25 })
  26
  27 // Static HTML/CSS/JS client files
  28 router.use('/client', express.static(distPath, { maxAge: constants.STATIC_MAX_AGE }))
  29
  30 // 404 for static files not found
  31 router.use('/client/*', function (req, res, next) {
  32   res.sendStatus(404)
  33 })
  34
  35 // ---------------------------------------------------------------------------
  36
  37 module.exports = router
  38
  39 // ---------------------------------------------------------------------------
  40
  41 function addOpenGraphTags (htmlStringPage, video) {
  42   let basePreviewUrlHttp
  43
  44   if (video.isOwned()) {
  45     basePreviewUrlHttp = constants.CONFIG.WEBSERVER.URL
  46   } else {
  47     basePreviewUrlHttp = constants.REMOTE_SCHEME.HTTP + '://' + video.Author.Pod.host
  48   }
  49
  50   // We fetch the remote preview (bigger than the thumbnail)
  51   // This should not overhead the remote server since social websites put in a cache the OpenGraph tags
  52   // We can't use the thumbnail because these social websites want bigger images (> 200x200 for Facebook for example)
  53   const previewUrl = basePreviewUrlHttp + constants.STATIC_PATHS.PREVIEWS + video.getPreviewName()
  54   const videoUrl = constants.CONFIG.WEBSERVER.URL + '/videos/watch/' + video.id
  55
  56   const metaTags = {
  57     'og:type': 'video',
  58     'og:title': video.name,
  59     'og:image': previewUrl,
  60     'og:url': videoUrl,
  61     'og:description': video.description,
  62
  63     'name': video.name,
  64     'description': video.description,
  65     'image': previewUrl,
  66
  67     'twitter:card': 'summary_large_image',
  68     'twitter:site': '@Chocobozzz',
  69     'twitter:title': video.name,
  70     'twitter:description': video.description,
  71     'twitter:image': previewUrl
  72   }
  73
  74   let tagsString = ''
  75   Object.keys(metaTags).forEach(function (tagName) {
  76     const tagValue = metaTags[tagName]
  77
  78     tagsString += '<meta property="' + tagName + '" content="' + tagValue + '" />'
  79   })
  80
  81   return htmlStringPage.replace(opengraphComment, tagsString)
  82 }
  83
  84 function generateWatchHtmlPage (req, res, next) {
  85   const videoId = req.params.id
  86
  87   // Let Angular application handle errors
  88   if (!validator.isUUID(videoId, 4)) return res.sendFile(indexPath)
  89
  90   parallel({
  91     file: function (callback) {
  92       fs.readFile(indexPath, callback)
  93     },
  94
  95     video: function (callback) {
  96       db.Video.loadAndPopulateAuthorAndPodAndTags(videoId, callback)
  97     }
  98   }, function (err, results) {
  99     if (err) return next(err)
 100
 101     const html = results.file.toString()
 102     const video = results.video
 103
 104     // Let Angular application handle errors
 105     if (!video) return res.sendFile(indexPath)
 106
 107     const htmlStringPageWithTags = addOpenGraphTags(html, video)
 108     res.set('Content-Type', 'text/html; charset=UTF-8').send(htmlStringPageWithTags)
 109   })
 110 }