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import * as express from 'express'
import * as Bluebird from 'bluebird'
import { buildFileLocale, getDefaultLocale, is18nLocale, POSSIBLE_LOCALES } from '../../shared/models/i18n/i18n'
import { CONFIG, CUSTOM_HTML_TAG_COMMENTS, EMBED_SIZE } from '../initializers'
import { join } from 'path'
import { escapeHTML } from '../helpers/core-utils'
import { VideoModel } from '../models/video/video'
import * as validator from 'validator'
import { VideoPrivacy } from '../../shared/models/videos'
import { readFile } from 'fs-extra'
import { getActivityStreamDuration } from '../models/video/video-format-utils'
export class ClientHtml {
private static htmlCache: { [path: string]: string } = {}
static invalidCache () {
ClientHtml.htmlCache = {}
}
static async getDefaultHTMLPage (req: express.Request, res: express.Response, paramLang?: string) {
const html = await ClientHtml.getIndexHTML(req, res, paramLang)
let customHtml = ClientHtml.addTitleTag(html)
customHtml = ClientHtml.addDescriptionTag(customHtml)
return customHtml
}
static async getWatchHTMLPage (videoId: string, req: express.Request, res: express.Response) {
let videoPromise: Bluebird<VideoModel>
// Let Angular application handle errors
if (validator.isInt(videoId) || validator.isUUID(videoId, 4)) {
videoPromise = VideoModel.loadAndPopulateAccountAndServerAndTags(videoId)
} else {
return ClientHtml.getIndexHTML(req, res)
}
const [ html, video ] = await Promise.all([
ClientHtml.getIndexHTML(req, res),
videoPromise
])
// Let Angular application handle errors
if (!video || video.privacy === VideoPrivacy.PRIVATE) {
return ClientHtml.getIndexHTML(req, res)
}
let customHtml = ClientHtml.addTitleTag(html, escapeHTML(video.name))
customHtml = ClientHtml.addDescriptionTag(customHtml, escapeHTML(video.description))
customHtml = ClientHtml.addOpenGraphAndOEmbedTags(customHtml, video)
return customHtml
}
private static async getIndexHTML (req: express.Request, res: express.Response, paramLang?: string) {
const path = ClientHtml.getIndexPath(req, res, paramLang)
if (ClientHtml.htmlCache[path]) return ClientHtml.htmlCache[path]
const buffer = await readFile(path)
let html = buffer.toString()
html = ClientHtml.addCustomCSS(html)
ClientHtml.htmlCache[path] = html
return html
}
private static getIndexPath (req: express.Request, res: express.Response, paramLang?: string) {
let lang: string
// Check param lang validity
if (paramLang && is18nLocale(paramLang)) {
lang = paramLang
// Save locale in cookies
res.cookie('clientLanguage', lang, {
secure: CONFIG.WEBSERVER.SCHEME === 'https',
sameSite: true,
maxAge: 1000 * 3600 * 24 * 90 // 3 months
})
} else if (req.cookies.clientLanguage && is18nLocale(req.cookies.clientLanguage)) {
lang = req.cookies.clientLanguage
} else {
lang = req.acceptsLanguages(POSSIBLE_LOCALES) || getDefaultLocale()
}
return join(__dirname, '../../../client/dist/' + buildFileLocale(lang) + '/index.html')
}
private static addTitleTag (htmlStringPage: string, title?: string) {
let text = title || CONFIG.INSTANCE.NAME
if (title) text += ` - ${CONFIG.INSTANCE.NAME}`
const titleTag = `<title>${text}</title>`
return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.TITLE, titleTag)
}
private static addDescriptionTag (htmlStringPage: string, description?: string) {
const content = description || CONFIG.INSTANCE.SHORT_DESCRIPTION
const descriptionTag = `<meta name="description" content="${content}" />`
return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.DESCRIPTION, descriptionTag)
}
private static addCustomCSS (htmlStringPage: string) {
const styleTag = '<style class="custom-css-style">' + CONFIG.INSTANCE.CUSTOMIZATIONS.CSS + '</style>'
return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.CUSTOM_CSS, styleTag)
}
private static addOpenGraphAndOEmbedTags (htmlStringPage: string, video: VideoModel) {
const previewUrl = CONFIG.WEBSERVER.URL + video.getPreviewStaticPath()
const videoUrl = CONFIG.WEBSERVER.URL + video.getWatchStaticPath()
const videoNameEscaped = escapeHTML(video.name)
const videoDescriptionEscaped = escapeHTML(video.description)
const embedUrl = CONFIG.WEBSERVER.URL + video.getEmbedStaticPath()
const openGraphMetaTags = {
'og:type': 'video',
'og:title': videoNameEscaped,
'og:image': previewUrl,
'og:url': videoUrl,
'og:description': videoDescriptionEscaped,
'og:video:url': embedUrl,
'og:video:secure_url': embedUrl,
'og:video:type': 'text/html',
'og:video:width': EMBED_SIZE.width,
'og:video:height': EMBED_SIZE.height,
'name': videoNameEscaped,
'description': videoDescriptionEscaped,
'image': previewUrl,
'twitter:card': CONFIG.SERVICES.TWITTER.WHITELISTED ? 'player' : 'summary_large_image',
'twitter:site': CONFIG.SERVICES.TWITTER.USERNAME,
'twitter:title': videoNameEscaped,
'twitter:description': videoDescriptionEscaped,
'twitter:image': previewUrl,
'twitter:player': embedUrl,
'twitter:player:width': EMBED_SIZE.width,
'twitter:player:height': EMBED_SIZE.height
}
const oembedLinkTags = [
{
type: 'application/json+oembed',
href: CONFIG.WEBSERVER.URL + '/services/oembed?url=' + encodeURIComponent(videoUrl),
title: videoNameEscaped
}
]
const schemaTags = {
'@context': 'http://schema.org',
'@type': 'VideoObject',
name: videoNameEscaped,
description: videoDescriptionEscaped,
thumbnailUrl: previewUrl,
uploadDate: video.createdAt.toISOString(),
duration: getActivityStreamDuration(video.duration),
contentUrl: videoUrl,
embedUrl: embedUrl,
interactionCount: video.views
}
let tagsString = ''
// Opengraph
Object.keys(openGraphMetaTags).forEach(tagName => {
const tagValue = openGraphMetaTags[tagName]
tagsString += `<meta property="${tagName}" content="${tagValue}" />`
})
// OEmbed
for (const oembedLinkTag of oembedLinkTags) {
tagsString += `<link rel="alternate" type="${oembedLinkTag.type}" href="${oembedLinkTag.href}" title="${oembedLinkTag.title}" />`
}
// Schema.org
tagsString += `<script type="application/ld+json">${JSON.stringify(schemaTags)}</script>`
// SEO, use origin video url so Google does not index remote videos
tagsString += `<link rel="canonical" href="${video.url}" />`
return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.OPENGRAPH_AND_OEMBED, tagsString)
}
}
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