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peertube/server/controllers/client.js

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'use strict'
const parallel = require('async/parallel')
const express = require('express')
const fs = require('fs')
const path = require('path')
const validator = require('express-validator').validator
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const constants = require('../initializers/constants')
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const db = require('../initializers/database')
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const router = express.Router()
const opengraphComment = '<!-- opengraph tags -->'
const distPath = path.join(__dirname, '../../client/dist')
const embedPath = path.join(distPath, 'standalone/videos/embed.html')
const indexPath = path.join(distPath, 'index.html')
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// Special route that add OpenGraph tags
// Do not use a template engine for a so little thing
router.use('/videos/watch/:id', generateWatchHtmlPage)
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router.use('/videos/embed', function (req, res, next) {
res.sendFile(embedPath)
})
// Static HTML/CSS/JS client files
router.use('/client', express.static(distPath, { maxAge: constants.STATIC_MAX_AGE }))
// 404 for static files not found
router.use('/client/*', function (req, res, next) {
res.sendStatus(404)
})
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// ---------------------------------------------------------------------------
module.exports = router
// ---------------------------------------------------------------------------
function addOpenGraphTags (htmlStringPage, video) {
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let basePreviewUrlHttp
if (video.isOwned()) {
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basePreviewUrlHttp = constants.CONFIG.WEBSERVER.URL
} else {
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basePreviewUrlHttp = constants.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)
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const previewUrl = basePreviewUrlHttp + constants.STATIC_PATHS.PREVIEWS + video.getPreviewName()
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const videoUrl = constants.CONFIG.WEBSERVER.URL + '/videos/watch/' + video.id
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const metaTags = {
'og:type': 'video',
'og:title': video.name,
'og:image': previewUrl,
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'og:url': videoUrl,
'og:description': video.description,
'name': video.name,
'description': video.description,
'image': previewUrl,
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'twitter:card': 'summary_large_image',
'twitter:site': '@Chocobozzz',
'twitter:title': video.name,
'twitter:description': video.description,
'twitter:image': previewUrl
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}
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
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if (!validator.isUUID(videoId, 4)) return res.sendFile(indexPath)
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parallel({
file: function (callback) {
fs.readFile(indexPath, callback)
},
video: function (callback) {
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db.Video.loadAndPopulateAuthorAndPodAndTags(videoId, callback)
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}
}, function (err, results) {
if (err) return next(err)
const html = results.file.toString()
const video = results.video
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// Let Angular application handle errors
if (!video) return res.sendFile(indexPath)
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const htmlStringPageWithTags = addOpenGraphTags(html, video)
res.set('Content-Type', 'text/html; charset=UTF-8').send(htmlStringPageWithTags)
})
}