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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)
})
}
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