server/lib/client-html.ts

   1 import * as express from 'express'
   2 import * as Bluebird from 'bluebird'
   3 import { buildFileLocale, getDefaultLocale, is18nLocale, POSSIBLE_LOCALES } from '../../shared/models/i18n/i18n'
   4 import { CONFIG, CUSTOM_HTML_TAG_COMMENTS, EMBED_SIZE } from '../initializers'
   5 import { join } from 'path'
   6 import { escapeHTML } from '../helpers/core-utils'
   7 import { VideoModel } from '../models/video/video'
   8 import * as validator from 'validator'
   9 import { VideoPrivacy } from '../../shared/models/videos'
  10 import { readFile } from 'fs-extra'
  11 import { getActivityStreamDuration } from '../models/video/video-format-utils'
  12
  13 export class ClientHtml {
  14
  15   private static htmlCache: { [path: string]: string } = {}
  16
  17   static invalidCache () {
  18     ClientHtml.htmlCache = {}
  19   }
  20
  21   static async getDefaultHTMLPage (req: express.Request, res: express.Response, paramLang?: string) {
  22     const html = await ClientHtml.getIndexHTML(req, res, paramLang)
  23
  24     let customHtml = ClientHtml.addTitleTag(html)
  25     customHtml = ClientHtml.addDescriptionTag(customHtml)
  26
  27     return customHtml
  28   }
  29
  30   static async getWatchHTMLPage (videoId: string, req: express.Request, res: express.Response) {
  31     let videoPromise: Bluebird<VideoModel>
  32
  33     // Let Angular application handle errors
  34     if (validator.isInt(videoId) || validator.isUUID(videoId, 4)) {
  35       videoPromise = VideoModel.loadAndPopulateAccountAndServerAndTags(videoId)
  36     } else {
  37       return ClientHtml.getIndexHTML(req, res)
  38     }
  39
  40     const [ html, video ] = await Promise.all([
  41       ClientHtml.getIndexHTML(req, res),
  42       videoPromise
  43     ])
  44
  45     // Let Angular application handle errors
  46     if (!video || video.privacy === VideoPrivacy.PRIVATE) {
  47       return ClientHtml.getIndexHTML(req, res)
  48     }
  49
  50     let customHtml = ClientHtml.addTitleTag(html, escapeHTML(video.name))
  51     customHtml = ClientHtml.addDescriptionTag(customHtml, escapeHTML(video.description))
  52     customHtml = ClientHtml.addOpenGraphAndOEmbedTags(customHtml, video)
  53
  54     return customHtml
  55   }
  56
  57   private static async getIndexHTML (req: express.Request, res: express.Response, paramLang?: string) {
  58     const path = ClientHtml.getIndexPath(req, res, paramLang)
  59     if (ClientHtml.htmlCache[path]) return ClientHtml.htmlCache[path]
  60
  61     const buffer = await readFile(path)
  62
  63     let html = buffer.toString()
  64
  65     html = ClientHtml.addCustomCSS(html)
  66
  67     ClientHtml.htmlCache[path] = html
  68
  69     return html
  70   }
  71
  72   private static getIndexPath (req: express.Request, res: express.Response, paramLang?: string) {
  73     let lang: string
  74
  75     // Check param lang validity
  76     if (paramLang && is18nLocale(paramLang)) {
  77       lang = paramLang
  78
  79       // Save locale in cookies
  80       res.cookie('clientLanguage', lang, {
  81         secure: CONFIG.WEBSERVER.SCHEME === 'https',
  82         sameSite: true,
  83         maxAge: 1000 * 3600 * 24 * 90 // 3 months
  84       })
  85
  86     } else if (req.cookies.clientLanguage && is18nLocale(req.cookies.clientLanguage)) {
  87       lang = req.cookies.clientLanguage
  88     } else {
  89       lang = req.acceptsLanguages(POSSIBLE_LOCALES) || getDefaultLocale()
  90     }
  91
  92     return join(__dirname, '../../../client/dist/' + buildFileLocale(lang) + '/index.html')
  93   }
  94
  95   private static addTitleTag (htmlStringPage: string, title?: string) {
  96     let text = title || CONFIG.INSTANCE.NAME
  97     if (title) text += ` - ${CONFIG.INSTANCE.NAME}`
  98
  99     const titleTag = `<title>${text}</title>`
 100
 101     return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.TITLE, titleTag)
 102   }
 103
 104   private static addDescriptionTag (htmlStringPage: string, description?: string) {
 105     const content = description || CONFIG.INSTANCE.SHORT_DESCRIPTION
 106     const descriptionTag = `<meta name="description" content="${content}" />`
 107
 108     return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.DESCRIPTION, descriptionTag)
 109   }
 110
 111   private static addCustomCSS (htmlStringPage: string) {
 112     const styleTag = '<style class="custom-css-style">' + CONFIG.INSTANCE.CUSTOMIZATIONS.CSS + '</style>'
 113
 114     return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.CUSTOM_CSS, styleTag)
 115   }
 116
 117   private static addOpenGraphAndOEmbedTags (htmlStringPage: string, video: VideoModel) {
 118     const previewUrl = CONFIG.WEBSERVER.URL + video.getPreviewStaticPath()
 119     const videoUrl = CONFIG.WEBSERVER.URL + video.getWatchStaticPath()
 120
 121     const videoNameEscaped = escapeHTML(video.name)
 122     const videoDescriptionEscaped = escapeHTML(video.description)
 123     const embedUrl = CONFIG.WEBSERVER.URL + video.getEmbedStaticPath()
 124
 125     const openGraphMetaTags = {
 126       'og:type': 'video',
 127       'og:title': videoNameEscaped,
 128       'og:image': previewUrl,
 129       'og:url': videoUrl,
 130       'og:description': videoDescriptionEscaped,
 131
 132       'og:video:url': embedUrl,
 133       'og:video:secure_url': embedUrl,
 134       'og:video:type': 'text/html',
 135       'og:video:width': EMBED_SIZE.width,
 136       'og:video:height': EMBED_SIZE.height,
 137
 138       'name': videoNameEscaped,
 139       'description': videoDescriptionEscaped,
 140       'image': previewUrl,
 141
 142       'twitter:card': CONFIG.SERVICES.TWITTER.WHITELISTED ? 'player' : 'summary_large_image',
 143       'twitter:site': CONFIG.SERVICES.TWITTER.USERNAME,
 144       'twitter:title': videoNameEscaped,
 145       'twitter:description': videoDescriptionEscaped,
 146       'twitter:image': previewUrl,
 147       'twitter:player': embedUrl,
 148       'twitter:player:width': EMBED_SIZE.width,
 149       'twitter:player:height': EMBED_SIZE.height
 150     }
 151
 152     const oembedLinkTags = [
 153       {
 154         type: 'application/json+oembed',
 155         href: CONFIG.WEBSERVER.URL + '/services/oembed?url=' + encodeURIComponent(videoUrl),
 156         title: videoNameEscaped
 157       }
 158     ]
 159
 160     const schemaTags = {
 161       '@context': 'http://schema.org',
 162       '@type': 'VideoObject',
 163       name: videoNameEscaped,
 164       description: videoDescriptionEscaped,
 165       thumbnailUrl: previewUrl,
 166       uploadDate: video.createdAt.toISOString(),
 167       duration: getActivityStreamDuration(video.duration),
 168       contentUrl: videoUrl,
 169       embedUrl: embedUrl,
 170       interactionCount: video.views
 171     }
 172
 173     let tagsString = ''
 174
 175     // Opengraph
 176     Object.keys(openGraphMetaTags).forEach(tagName => {
 177       const tagValue = openGraphMetaTags[tagName]
 178
 179       tagsString += `<meta property="${tagName}" content="${tagValue}" />`
 180     })
 181
 182     // OEmbed
 183     for (const oembedLinkTag of oembedLinkTags) {
 184       tagsString += `<link rel="alternate" type="${oembedLinkTag.type}" href="${oembedLinkTag.href}" title="${oembedLinkTag.title}" />`
 185     }
 186
 187     // Schema.org
 188     tagsString += `<script type="application/ld+json">${JSON.stringify(schemaTags)}</script>`
 189
 190     // SEO, use origin video url so Google does not index remote videos
 191     tagsString += `<link rel="canonical" href="${video.url}" />`
 192
 193     return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.OPENGRAPH_AND_OEMBED, tagsString)
 194   }
 195 }