First typescript iteration

server/controllers/client.ts

@@ -0,0 +1,118 @@
+import { parallel } from 'async'
+import express = require('express')
+import fs = require('fs')
+import { join } from 'path'
+import expressValidator = require('express-validator')
+// TODO: use .validator when express-validator typing will have validator field
+const validator = expressValidator['validator']
+
+const db = require('../initializers/database')
+import {
+  CONFIG,
+  REMOTE_SCHEME,
+  STATIC_PATHS,
+  STATIC_MAX_AGE
+} from '../initializers'
+
+const clientsRouter = express.Router()
+
+// TODO: move to constants
+const opengraphComment = '<!-- opengraph tags -->'
+const distPath = join(__dirname, '..', '..', 'client/dist')
+const embedPath = join(distPath, 'standalone/videos/embed.html')
+const indexPath = join(distPath, 'index.html')
+
+// Special route that add OpenGraph tags
+// Do not use a template engine for a so little thing
+clientsRouter.use('/videos/watch/:id', generateWatchHtmlPage)
+
+clientsRouter.use('/videos/embed', function (req, res, next) {
+  res.sendFile(embedPath)
+})
+
+// Static HTML/CSS/JS client files
+clientsRouter.use('/client', express.static(distPath, { maxAge: STATIC_MAX_AGE }))
+
+// 404 for static files not found
+clientsRouter.use('/client/*', function (req, res, next) {
+  res.sendStatus(404)
+})
+
+// ---------------------------------------------------------------------------
+
+export {
+  clientsRouter
+}
+
+// ---------------------------------------------------------------------------
+
+function addOpenGraphTags (htmlStringPage, video) {
+  let basePreviewUrlHttp
+
+  if (video.isOwned()) {
+    basePreviewUrlHttp = CONFIG.WEBSERVER.URL
+  } else {
+    basePreviewUrlHttp = REMOTE_SCHEME.HTTP + '://' + video.Author.Pod.host
+  }
+
+  // We fetch the remote preview (bigger than the thumbnail)
+  // This should not overhead the remote server since social websites put in a cache the OpenGraph tags
+  // We can't use the thumbnail because these social websites want bigger images (> 200x200 for Facebook for example)
+  const previewUrl = basePreviewUrlHttp + STATIC_PATHS.PREVIEWS + video.getPreviewName()
+  const videoUrl = CONFIG.WEBSERVER.URL + '/videos/watch/' + video.id
+
+  const metaTags = {
+    'og:type': 'video',
+    'og:title': video.name,
+    'og:image': previewUrl,
+    'og:url': videoUrl,
+    'og:description': video.description,
+
+    'name': video.name,
+    'description': video.description,
+    'image': previewUrl,
+
+    'twitter:card': 'summary_large_image',
+    'twitter:site': '@Chocobozzz',
+    'twitter:title': video.name,
+    'twitter:description': video.description,
+    'twitter:image': previewUrl
+  }
+
+  let tagsString = ''
+  Object.keys(metaTags).forEach(function (tagName) {
+    const tagValue = metaTags[tagName]
+
+    tagsString += '<meta property="' + tagName + '" content="' + tagValue + '" />'
+  })
+
+  return htmlStringPage.replace(opengraphComment, tagsString)
+}
+
+function generateWatchHtmlPage (req, res, next) {
+  const videoId = req.params.id
+
+  // Let Angular application handle errors
+  if (!validator.isUUID(videoId, 4)) return res.sendFile(indexPath)
+
+  parallel({
+    file: function (callback) {
+      fs.readFile(indexPath, callback)
+    },
+
+    video: function (callback) {
+      db.Video.loadAndPopulateAuthorAndPodAndTags(videoId, callback)
+    }
+  }, function (err, result: any) {
+    if (err) return next(err)
+
+    const html = result.file.toString()
+    const video = result.video
+
+    // Let Angular application handle errors
+    if (!video) return res.sendFile(indexPath)
+
+    const htmlStringPageWithTags = addOpenGraphTags(html, video)
+    res.set('Content-Type', 'text/html; charset=UTF-8').send(htmlStringPageWithTags)
+  })
+}