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'use strict'
const parallel = require('async/parallel')
const express = require('express')
const fs = require('fs')
const mongoose = require('mongoose')
const path = require('path')
const validator = require('express-validator').validator
const constants = require('../initializers/constants')
const Video = mongoose.model('Video')
const router = express.Router()
const opengraphComment = '<!-- opengraph tags -->'
const embedPath = path.join(__dirname, '../../client/dist/standalone/videos/embed.html')
const indexPath = path.join(__dirname, '../../client/dist/index.html')
// Special route that add OpenGraph tags
// Do not use a template engine for a so little thing
router.use('/videos/watch/:id', generateWatchHtmlPage)
router.use('/videos/embed', function (req, res, next) {
res.sendFile(embedPath)
})
// ---------------------------------------------------------------------------
module.exports = router
// ---------------------------------------------------------------------------
function addOpenGraphTags (htmlStringPage, video) {
const videoUrl = constants.CONFIG.WEBSERVER.URL + '/videos/watch/'
let baseUrlHttp
if (video.isOwned()) {
baseUrlHttp = constants.CONFIG.WEBSERVER.URL
} else {
baseUrlHttp = constants.REMOTE_SCHEME.HTTP + '://' + video.podHost
}
// 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 = baseUrlHttp + constants.STATIC_PATHS.PREVIEWS + video.getPreviewName()
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.isMongoId(videoId)) return res.sendFile(indexPath)
parallel({
file: function (callback) {
fs.readFile(indexPath, callback)
},
video: function (callback) {
Video.load(videoId, callback)
}
}, function (err, results) {
if (err) return next(err)
const html = results.file.toString()
const video = results.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)
})
}
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