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, STATIC_PATHS } 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 getIndexHTML (req: express.Request, res: express.Response, paramLang?: string) {
  22     const path = ClientHtml.getIndexPath(req, res, paramLang)
  23     if (ClientHtml.htmlCache[path]) return ClientHtml.htmlCache[path]
  24
  25     const buffer = await readFile(path)
  26
  27     let html = buffer.toString()
  28
  29     html = ClientHtml.addTitleTag(html)
  30     html = ClientHtml.addDescriptionTag(html)
  31     html = ClientHtml.addCustomCSS(html)
  32
  33     ClientHtml.htmlCache[path] = html
  34
  35     return html
  36   }
  37
  38   static async getWatchHTMLPage (videoId: string, req: express.Request, res: express.Response) {
  39     let videoPromise: Bluebird<VideoModel>
  40
  41     // Let Angular application handle errors
  42     if (validator.isInt(videoId) || validator.isUUID(videoId, 4)) {
  43       videoPromise = VideoModel.loadAndPopulateAccountAndServerAndTags(videoId)
  44     } else {
  45       return ClientHtml.getIndexHTML(req, res)
  46     }
  47
  48     const [ html, video ] = await Promise.all([
  49       ClientHtml.getIndexHTML(req, res),
  50       videoPromise
  51     ])
  52
  53     // Let Angular application handle errors
  54     if (!video || video.privacy === VideoPrivacy.PRIVATE) {
  55       return ClientHtml.getIndexHTML(req, res)
  56     }
  57
  58     return ClientHtml.addOpenGraphAndOEmbedTags(html, video)
  59   }
  60
  61   private static getIndexPath (req: express.Request, res: express.Response, paramLang?: string) {
  62     let lang: string
  63
  64     // Check param lang validity
  65     if (paramLang && is18nLocale(paramLang)) {
  66       lang = paramLang
  67
  68       // Save locale in cookies
  69       res.cookie('clientLanguage', lang, {
  70         secure: CONFIG.WEBSERVER.SCHEME === 'https',
  71         sameSite: true,
  72         maxAge: 1000 * 3600 * 24 * 90 // 3 months
  73       })
  74
  75     } else if (req.cookies.clientLanguage && is18nLocale(req.cookies.clientLanguage)) {
  76       lang = req.cookies.clientLanguage
  77     } else {
  78       lang = req.acceptsLanguages(POSSIBLE_LOCALES) || getDefaultLocale()
  79     }
  80
  81     return join(__dirname, '../../../client/dist/' + buildFileLocale(lang) + '/index.html')
  82   }
  83
  84   private static addTitleTag (htmlStringPage: string) {
  85     const titleTag = '<title>' + CONFIG.INSTANCE.NAME + '</title>'
  86
  87     return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.TITLE, titleTag)
  88   }
  89
  90   private static addDescriptionTag (htmlStringPage: string) {
  91     const descriptionTag = `<meta name="description" content="${CONFIG.INSTANCE.SHORT_DESCRIPTION}" />`
  92
  93     return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.DESCRIPTION, descriptionTag)
  94   }
  95
  96   private static addCustomCSS (htmlStringPage: string) {
  97     const styleTag = '<style class="custom-css-style">' + CONFIG.INSTANCE.CUSTOMIZATIONS.CSS + '</style>'
  98
  99     return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.CUSTOM_CSS, styleTag)
 100   }
 101
 102   private static addOpenGraphAndOEmbedTags (htmlStringPage: string, video: VideoModel) {
 103     const previewUrl = CONFIG.WEBSERVER.URL + STATIC_PATHS.PREVIEWS + video.getPreviewName()
 104     const videoUrl = CONFIG.WEBSERVER.URL + '/videos/watch/' + video.uuid
 105
 106     const videoNameEscaped = escapeHTML(video.name)
 107     const videoDescriptionEscaped = escapeHTML(video.description)
 108     const embedUrl = CONFIG.WEBSERVER.URL + video.getEmbedStaticPath()
 109
 110     const openGraphMetaTags = {
 111       'og:type': 'video',
 112       'og:title': videoNameEscaped,
 113       'og:image': previewUrl,
 114       'og:url': videoUrl,
 115       'og:description': videoDescriptionEscaped,
 116
 117       'og:video:url': embedUrl,
 118       'og:video:secure_url': embedUrl,
 119       'og:video:type': 'text/html',
 120       'og:video:width': EMBED_SIZE.width,
 121       'og:video:height': EMBED_SIZE.height,
 122
 123       'name': videoNameEscaped,
 124       'description': videoDescriptionEscaped,
 125       'image': previewUrl,
 126
 127       'twitter:card': CONFIG.SERVICES.TWITTER.WHITELISTED ? 'player' : 'summary_large_image',
 128       'twitter:site': CONFIG.SERVICES.TWITTER.USERNAME,
 129       'twitter:title': videoNameEscaped,
 130       'twitter:description': videoDescriptionEscaped,
 131       'twitter:image': previewUrl,
 132       'twitter:player': embedUrl,
 133       'twitter:player:width': EMBED_SIZE.width,
 134       'twitter:player:height': EMBED_SIZE.height
 135     }
 136
 137     const oembedLinkTags = [
 138       {
 139         type: 'application/json+oembed',
 140         href: CONFIG.WEBSERVER.URL + '/services/oembed?url=' + encodeURIComponent(videoUrl),
 141         title: videoNameEscaped
 142       }
 143     ]
 144
 145     const schemaTags = {
 146       '@context': 'http://schema.org',
 147       '@type': 'VideoObject',
 148       name: videoNameEscaped,
 149       description: videoDescriptionEscaped,
 150       thumbnailUrl: previewUrl,
 151       uploadDate: video.createdAt.toISOString(),
 152       duration: getActivityStreamDuration(video.duration),
 153       contentUrl: videoUrl,
 154       embedUrl: embedUrl,
 155       interactionCount: video.views
 156     }
 157
 158     let tagsString = ''
 159
 160     // Opengraph
 161     Object.keys(openGraphMetaTags).forEach(tagName => {
 162       const tagValue = openGraphMetaTags[tagName]
 163
 164       tagsString += `<meta property="${tagName}" content="${tagValue}" />`
 165     })
 166
 167     // OEmbed
 168     for (const oembedLinkTag of oembedLinkTags) {
 169       tagsString += `<link rel="alternate" type="${oembedLinkTag.type}" href="${oembedLinkTag.href}" title="${oembedLinkTag.title}" />`
 170     }
 171
 172     // Schema.org
 173     tagsString += `<script type="application/ld+json">${JSON.stringify(schemaTags)}</script>`
 174
 175     // SEO
 176     tagsString += `<link rel="canonical" href="${videoUrl}" />`
 177
 178     return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.OPENGRAPH_AND_OEMBED, tagsString)
 179   }
 180 }