server/lib/client-html.ts

   1 import * as express from 'express'
   2 import { buildFileLocale, getDefaultLocale, is18nLocale, POSSIBLE_LOCALES } from '../../shared/models/i18n/i18n'
   3 import { CONFIG, CUSTOM_HTML_TAG_COMMENTS, EMBED_SIZE } from '../initializers'
   4 import { join } from 'path'
   5 import { escapeHTML } from '../helpers/core-utils'
   6 import { VideoModel } from '../models/video/video'
   7 import * as validator from 'validator'
   8 import { VideoPrivacy } from '../../shared/models/videos'
   9 import { readFile } from 'fs-extra'
  10 import { getActivityStreamDuration } from '../models/video/video-format-utils'
  11 import { AccountModel } from '../models/account/account'
  12 import { VideoChannelModel } from '../models/video/video-channel'
  13 import * as Bluebird from 'bluebird'
  14
  15 export class ClientHtml {
  16
  17   private static htmlCache: { [ path: string ]: string } = {}
  18
  19   static invalidCache () {
  20     ClientHtml.htmlCache = {}
  21   }
  22
  23   static async getDefaultHTMLPage (req: express.Request, res: express.Response, paramLang?: string) {
  24     const html = await ClientHtml.getIndexHTML(req, res, paramLang)
  25
  26     let customHtml = ClientHtml.addTitleTag(html)
  27     customHtml = ClientHtml.addDescriptionTag(customHtml)
  28
  29     return customHtml
  30   }
  31
  32   static async getWatchHTMLPage (videoId: string, req: express.Request, res: express.Response) {
  33     // Let Angular application handle errors
  34     if (!validator.isInt(videoId) && !validator.isUUID(videoId, 4)) {
  35       return ClientHtml.getIndexHTML(req, res)
  36     }
  37
  38     const [ html, video ] = await Promise.all([
  39       ClientHtml.getIndexHTML(req, res),
  40       VideoModel.loadAndPopulateAccountAndServerAndTags(videoId)
  41     ])
  42
  43     // Let Angular application handle errors
  44     if (!video || video.privacy === VideoPrivacy.PRIVATE) {
  45       return ClientHtml.getIndexHTML(req, res)
  46     }
  47
  48     let customHtml = ClientHtml.addTitleTag(html, escapeHTML(video.name))
  49     customHtml = ClientHtml.addDescriptionTag(customHtml, escapeHTML(video.description))
  50     customHtml = ClientHtml.addVideoOpenGraphAndOEmbedTags(customHtml, video)
  51
  52     return customHtml
  53   }
  54
  55   static async getAccountHTMLPage (nameWithHost: string, req: express.Request, res: express.Response) {
  56     return this.getAccountOrChannelHTMLPage(() => AccountModel.loadByNameWithHost(nameWithHost), req, res)
  57   }
  58
  59   static async getVideoChannelHTMLPage (nameWithHost: string, req: express.Request, res: express.Response) {
  60     return this.getAccountOrChannelHTMLPage(() => VideoChannelModel.loadByNameWithHostAndPopulateAccount(nameWithHost), req, res)
  61   }
  62
  63   private static async getAccountOrChannelHTMLPage (
  64     loader: () => Bluebird<AccountModel | VideoChannelModel>,
  65     req: express.Request,
  66     res: express.Response
  67   ) {
  68     const [ html, entity ] = await Promise.all([
  69       ClientHtml.getIndexHTML(req, res),
  70       loader()
  71     ])
  72
  73     // Let Angular application handle errors
  74     if (!entity) {
  75       return ClientHtml.getIndexHTML(req, res)
  76     }
  77
  78     let customHtml = ClientHtml.addTitleTag(html, escapeHTML(entity.getDisplayName()))
  79     customHtml = ClientHtml.addDescriptionTag(customHtml, escapeHTML(entity.description))
  80     customHtml = ClientHtml.addAccountOrChannelMetaTags(customHtml, entity)
  81
  82     return customHtml
  83   }
  84
  85   private static async getIndexHTML (req: express.Request, res: express.Response, paramLang?: string) {
  86     const path = ClientHtml.getIndexPath(req, res, paramLang)
  87     if (ClientHtml.htmlCache[ path ]) return ClientHtml.htmlCache[ path ]
  88
  89     const buffer = await readFile(path)
  90
  91     let html = buffer.toString()
  92
  93     html = ClientHtml.addCustomCSS(html)
  94
  95     ClientHtml.htmlCache[ path ] = html
  96
  97     return html
  98   }
  99
 100   private static getIndexPath (req: express.Request, res: express.Response, paramLang?: string) {
 101     let lang: string
 102
 103     // Check param lang validity
 104     if (paramLang && is18nLocale(paramLang)) {
 105       lang = paramLang
 106
 107       // Save locale in cookies
 108       res.cookie('clientLanguage', lang, {
 109         secure: CONFIG.WEBSERVER.SCHEME === 'https',
 110         sameSite: true,
 111         maxAge: 1000 * 3600 * 24 * 90 // 3 months
 112       })
 113
 114     } else if (req.cookies.clientLanguage && is18nLocale(req.cookies.clientLanguage)) {
 115       lang = req.cookies.clientLanguage
 116     } else {
 117       lang = req.acceptsLanguages(POSSIBLE_LOCALES) || getDefaultLocale()
 118     }
 119
 120     return join(__dirname, '../../../client/dist/' + buildFileLocale(lang) + '/index.html')
 121   }
 122
 123   private static addTitleTag (htmlStringPage: string, title?: string) {
 124     let text = title || CONFIG.INSTANCE.NAME
 125     if (title) text += ` - ${CONFIG.INSTANCE.NAME}`
 126
 127     const titleTag = `<title>${text}</title>`
 128
 129     return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.TITLE, titleTag)
 130   }
 131
 132   private static addDescriptionTag (htmlStringPage: string, description?: string) {
 133     const content = description || CONFIG.INSTANCE.SHORT_DESCRIPTION
 134     const descriptionTag = `<meta name="description" content="${content}" />`
 135
 136     return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.DESCRIPTION, descriptionTag)
 137   }
 138
 139   private static addCustomCSS (htmlStringPage: string) {
 140     const styleTag = '<style class="custom-css-style">' + CONFIG.INSTANCE.CUSTOMIZATIONS.CSS + '</style>'
 141
 142     return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.CUSTOM_CSS, styleTag)
 143   }
 144
 145   private static addVideoOpenGraphAndOEmbedTags (htmlStringPage: string, video: VideoModel) {
 146     const previewUrl = CONFIG.WEBSERVER.URL + video.getPreviewStaticPath()
 147     const videoUrl = CONFIG.WEBSERVER.URL + video.getWatchStaticPath()
 148
 149     const videoNameEscaped = escapeHTML(video.name)
 150     const videoDescriptionEscaped = escapeHTML(video.description)
 151     const embedUrl = CONFIG.WEBSERVER.URL + video.getEmbedStaticPath()
 152
 153     const openGraphMetaTags = {
 154       'og:type': 'video',
 155       'og:title': videoNameEscaped,
 156       'og:image': previewUrl,
 157       'og:url': videoUrl,
 158       'og:description': videoDescriptionEscaped,
 159
 160       'og:video:url': embedUrl,
 161       'og:video:secure_url': embedUrl,
 162       'og:video:type': 'text/html',
 163       'og:video:width': EMBED_SIZE.width,
 164       'og:video:height': EMBED_SIZE.height,
 165
 166       'name': videoNameEscaped,
 167       'description': videoDescriptionEscaped,
 168       'image': previewUrl,
 169
 170       'twitter:card': CONFIG.SERVICES.TWITTER.WHITELISTED ? 'player' : 'summary_large_image',
 171       'twitter:site': CONFIG.SERVICES.TWITTER.USERNAME,
 172       'twitter:title': videoNameEscaped,
 173       'twitter:description': videoDescriptionEscaped,
 174       'twitter:image': previewUrl,
 175       'twitter:player': embedUrl,
 176       'twitter:player:width': EMBED_SIZE.width,
 177       'twitter:player:height': EMBED_SIZE.height
 178     }
 179
 180     const oembedLinkTags = [
 181       {
 182         type: 'application/json+oembed',
 183         href: CONFIG.WEBSERVER.URL + '/services/oembed?url=' + encodeURIComponent(videoUrl),
 184         title: videoNameEscaped
 185       }
 186     ]
 187
 188     const schemaTags = {
 189       '@context': 'http://schema.org',
 190       '@type': 'VideoObject',
 191       name: videoNameEscaped,
 192       description: videoDescriptionEscaped,
 193       thumbnailUrl: previewUrl,
 194       uploadDate: video.createdAt.toISOString(),
 195       duration: getActivityStreamDuration(video.duration),
 196       contentUrl: videoUrl,
 197       embedUrl: embedUrl,
 198       interactionCount: video.views
 199     }
 200
 201     let tagsString = ''
 202
 203     // Opengraph
 204     Object.keys(openGraphMetaTags).forEach(tagName => {
 205       const tagValue = openGraphMetaTags[ tagName ]
 206
 207       tagsString += `<meta property="${tagName}" content="${tagValue}" />`
 208     })
 209
 210     // OEmbed
 211     for (const oembedLinkTag of oembedLinkTags) {
 212       tagsString += `<link rel="alternate" type="${oembedLinkTag.type}" href="${oembedLinkTag.href}" title="${oembedLinkTag.title}" />`
 213     }
 214
 215     // Schema.org
 216     tagsString += `<script type="application/ld+json">${JSON.stringify(schemaTags)}</script>`
 217
 218     // SEO, use origin video url so Google does not index remote videos
 219     tagsString += `<link rel="canonical" href="${video.url}" />`
 220
 221     return this.addOpenGraphAndOEmbedTags(htmlStringPage, tagsString)
 222   }
 223
 224   private static addAccountOrChannelMetaTags (htmlStringPage: string, entity: AccountModel | VideoChannelModel) {
 225     // SEO, use origin account or channel URL
 226     const metaTags = `<link rel="canonical" href="${entity.Actor.url}" />`
 227
 228     return this.addOpenGraphAndOEmbedTags(htmlStringPage, metaTags)
 229   }
 230
 231   private static addOpenGraphAndOEmbedTags (htmlStringPage: string, metaTags: string) {
 232     return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.META_TAGS, metaTags)
 233   }
 234 }