server/controllers/client.ts

   1 import { parallel } from 'async'
   2 import express = require('express')
   3 import fs = require('fs')
   4 import { join } from 'path'
   5 import expressValidator = require('express-validator')
   6 // TODO: use .validator when express-validator typing will have validator field
   7 const validator = expressValidator['validator']
   8
   9 const db = require('../initializers/database')
  10 import {
  11   CONFIG,
  12   REMOTE_SCHEME,
  13   STATIC_PATHS,
  14   STATIC_MAX_AGE
  15 } from '../initializers'
  16
  17 const clientsRouter = express.Router()
  18
  19 // TODO: move to constants
  20 const opengraphComment = '<!-- opengraph tags -->'
  21 const distPath = join(__dirname, '..', '..', 'client/dist')
  22 const embedPath = join(distPath, 'standalone/videos/embed.html')
  23 const indexPath = join(distPath, 'index.html')
  24
  25 // Special route that add OpenGraph tags
  26 // Do not use a template engine for a so little thing
  27 clientsRouter.use('/videos/watch/:id', generateWatchHtmlPage)
  28
  29 clientsRouter.use('/videos/embed', function (req, res, next) {
  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/*', function (req, res, next) {
  38   res.sendStatus(404)
  39 })
  40
  41 // ---------------------------------------------------------------------------
  42
  43 export {
  44   clientsRouter
  45 }
  46
  47 // ---------------------------------------------------------------------------
  48
  49 function addOpenGraphTags (htmlStringPage, video) {
  50   let basePreviewUrlHttp
  51
  52   if (video.isOwned()) {
  53     basePreviewUrlHttp = CONFIG.WEBSERVER.URL
  54   } else {
  55     basePreviewUrlHttp = REMOTE_SCHEME.HTTP + '://' + video.Author.Pod.host
  56   }
  57
  58   // We fetch the remote preview (bigger than the thumbnail)
  59   // This should not overhead the remote server since social websites put in a cache the OpenGraph tags
  60   // We can't use the thumbnail because these social websites want bigger images (> 200x200 for Facebook for example)
  61   const previewUrl = basePreviewUrlHttp + STATIC_PATHS.PREVIEWS + video.getPreviewName()
  62   const videoUrl = CONFIG.WEBSERVER.URL + '/videos/watch/' + video.id
  63
  64   const metaTags = {
  65     'og:type': 'video',
  66     'og:title': video.name,
  67     'og:image': previewUrl,
  68     'og:url': videoUrl,
  69     'og:description': video.description,
  70
  71     'name': video.name,
  72     'description': video.description,
  73     'image': previewUrl,
  74
  75     'twitter:card': 'summary_large_image',
  76     'twitter:site': '@Chocobozzz',
  77     'twitter:title': video.name,
  78     'twitter:description': video.description,
  79     'twitter:image': previewUrl
  80   }
  81
  82   let tagsString = ''
  83   Object.keys(metaTags).forEach(function (tagName) {
  84     const tagValue = metaTags[tagName]
  85
  86     tagsString += '<meta property="' + tagName + '" content="' + tagValue + '" />'
  87   })
  88
  89   return htmlStringPage.replace(opengraphComment, tagsString)
  90 }
  91
  92 function generateWatchHtmlPage (req, res, next) {
  93   const videoId = req.params.id
  94
  95   // Let Angular application handle errors
  96   if (!validator.isUUID(videoId, 4)) return res.sendFile(indexPath)
  97
  98   parallel({
  99     file: function (callback) {
 100       fs.readFile(indexPath, callback)
 101     },
 102
 103     video: function (callback) {
 104       db.Video.loadAndPopulateAuthorAndPodAndTags(videoId, callback)
 105     }
 106   }, function (err, result: any) {
 107     if (err) return next(err)
 108
 109     const html = result.file.toString()
 110     const video = result.video
 111
 112     // Let Angular application handle errors
 113     if (!video) return res.sendFile(indexPath)
 114
 115     const htmlStringPageWithTags = addOpenGraphTags(html, video)
 116     res.set('Content-Type', 'text/html; charset=UTF-8').send(htmlStringPageWithTags)
 117   })
 118 }