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   STATIC_PATHS,
  10   STATIC_MAX_AGE,
  11   OPENGRAPH_AND_OEMBED_COMMENT
  12 } from '../initializers'
  13 import { root, readFileBufferPromise, escapeHTML } from '../helpers'
  14 import { VideoInstance } from '../models'
  15
  16 const clientsRouter = express.Router()
  17
  18 const distPath = join(root(), 'client', 'dist')
  19 const embedPath = join(distPath, 'standalone', 'videos', 'embed.html')
  20 const indexPath = join(distPath, 'index.html')
  21
  22 // Special route that add OpenGraph and oEmbed tags
  23 // Do not use a template engine for a so little thing
  24 clientsRouter.use('/videos/watch/:id', generateWatchHtmlPage)
  25
  26 clientsRouter.use('/videos/embed', (req: express.Request, res: express.Response, next: express.NextFunction) => {
  27   res.sendFile(embedPath)
  28 })
  29
  30 // Static HTML/CSS/JS client files
  31 clientsRouter.use('/client', express.static(distPath, { maxAge: STATIC_MAX_AGE }))
  32
  33 // 404 for static files not found
  34 clientsRouter.use('/client/*', (req: express.Request, res: express.Response, next: express.NextFunction) => {
  35   res.sendStatus(404)
  36 })
  37
  38 // ---------------------------------------------------------------------------
  39
  40 export {
  41   clientsRouter
  42 }
  43
  44 // ---------------------------------------------------------------------------
  45
  46 function addOpenGraphAndOEmbedTags (htmlStringPage: string, video: VideoInstance) {
  47   const previewUrl = CONFIG.WEBSERVER.URL + STATIC_PATHS.PREVIEWS + video.getPreviewName()
  48   const videoUrl = CONFIG.WEBSERVER.URL + '/videos/watch/' + video.uuid
  49
  50   const videoName = escapeHTML(video.name)
  51   const videoDescription = escapeHTML(video.description)
  52
  53   const openGraphMetaTags = {
  54     'og:type': 'video',
  55     'og:title': videoName,
  56     'og:image': previewUrl,
  57     'og:url': videoUrl,
  58     'og:description': videoDescription,
  59
  60     'name': videoName,
  61     'description': videoDescription,
  62     'image': previewUrl,
  63
  64     'twitter:card': 'summary_large_image',
  65     'twitter:site': '@Chocobozzz',
  66     'twitter:title': videoName,
  67     'twitter:description': videoDescription,
  68     'twitter:image': previewUrl
  69   }
  70
  71   const oembedLinkTags = [
  72     {
  73       type: 'application/json+oembed',
  74       href: CONFIG.WEBSERVER.URL + '/services/oembed?url=' + encodeURIComponent(videoUrl),
  75       title: videoName
  76     }
  77   ]
  78
  79   let tagsString = ''
  80   Object.keys(openGraphMetaTags).forEach(tagName => {
  81     const tagValue = openGraphMetaTags[tagName]
  82
  83     tagsString += `<meta property="${tagName}" content="${tagValue}" />`
  84   })
  85
  86   for (const oembedLinkTag of oembedLinkTags) {
  87     tagsString += `<link rel="alternate" type="${oembedLinkTag.type}" href="${oembedLinkTag.href}" title="${oembedLinkTag.title}" />`
  88   }
  89
  90   return htmlStringPage.replace(OPENGRAPH_AND_OEMBED_COMMENT, tagsString)
  91 }
  92
  93 function generateWatchHtmlPage (req: express.Request, res: express.Response, next: express.NextFunction) {
  94   const videoId = '' + req.params.id
  95   let videoPromise: Promise<VideoInstance>
  96
  97   // Let Angular application handle errors
  98   if (validator.isUUID(videoId, 4)) {
  99     videoPromise = db.Video.loadByUUIDAndPopulateAuthorAndPodAndTags(videoId)
 100   } else if (validator.isInt(videoId)) {
 101     videoPromise = db.Video.loadAndPopulateAuthorAndPodAndTags(+videoId)
 102   } else {
 103     return res.sendFile(indexPath)
 104   }
 105
 106   Promise.all([
 107     readFileBufferPromise(indexPath),
 108     videoPromise
 109   ])
 110   .then(([ file, video ]) => {
 111     file = file as Buffer
 112     video = video as VideoInstance
 113
 114     const html = file.toString()
 115
 116     // Let Angular application handle errors
 117     if (!video) return res.sendFile(indexPath)
 118
 119     const htmlStringPageWithTags = addOpenGraphAndOEmbedTags(html, video)
 120     res.set('Content-Type', 'text/html; charset=UTF-8').send(htmlStringPageWithTags)
 121   })
 122   .catch(err => next(err))
 123 }