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 { CUSTOM_HTML_TAG_COMMENTS, EMBED_SIZE, PLUGIN_GLOBAL_CSS_PATH, WEBSERVER } from '../initializers/constants'
   4 import { join } from 'path'
   5 import { escapeHTML, sha256 } 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 import { CONFIG } from '../initializers/config'
  15
  16 export class ClientHtml {
  17
  18   private static htmlCache: { [ path: string ]: string } = {}
  19
  20   static invalidCache () {
  21     ClientHtml.htmlCache = {}
  22   }
  23
  24   static async getDefaultHTMLPage (req: express.Request, res: express.Response, paramLang?: string) {
  25     const html = await ClientHtml.getIndexHTML(req, res, paramLang)
  26
  27     let customHtml = ClientHtml.addTitleTag(html)
  28     customHtml = ClientHtml.addDescriptionTag(customHtml)
  29
  30     return customHtml
  31   }
  32
  33   static async getWatchHTMLPage (videoId: string, req: express.Request, res: express.Response) {
  34     // Let Angular application handle errors
  35     if (!validator.isInt(videoId) && !validator.isUUID(videoId, 4)) {
  36       return ClientHtml.getIndexHTML(req, res)
  37     }
  38
  39     const [ html, video ] = await Promise.all([
  40       ClientHtml.getIndexHTML(req, res),
  41       VideoModel.loadAndPopulateAccountAndServerAndTags(videoId)
  42     ])
  43
  44     // Let Angular application handle errors
  45     if (!video || video.privacy === VideoPrivacy.PRIVATE) {
  46       return ClientHtml.getIndexHTML(req, res)
  47     }
  48
  49     let customHtml = ClientHtml.addTitleTag(html, escapeHTML(video.name))
  50     customHtml = ClientHtml.addDescriptionTag(customHtml, escapeHTML(video.description))
  51     customHtml = ClientHtml.addVideoOpenGraphAndOEmbedTags(customHtml, video)
  52
  53     return customHtml
  54   }
  55
  56   static async getAccountHTMLPage (nameWithHost: string, req: express.Request, res: express.Response) {
  57     return this.getAccountOrChannelHTMLPage(() => AccountModel.loadByNameWithHost(nameWithHost), req, res)
  58   }
  59
  60   static async getVideoChannelHTMLPage (nameWithHost: string, req: express.Request, res: express.Response) {
  61     return this.getAccountOrChannelHTMLPage(() => VideoChannelModel.loadByNameWithHostAndPopulateAccount(nameWithHost), req, res)
  62   }
  63
  64   private static async getAccountOrChannelHTMLPage (
  65     loader: () => Bluebird<AccountModel | VideoChannelModel>,
  66     req: express.Request,
  67     res: express.Response
  68   ) {
  69     const [ html, entity ] = await Promise.all([
  70       ClientHtml.getIndexHTML(req, res),
  71       loader()
  72     ])
  73
  74     // Let Angular application handle errors
  75     if (!entity) {
  76       return ClientHtml.getIndexHTML(req, res)
  77     }
  78
  79     let customHtml = ClientHtml.addTitleTag(html, escapeHTML(entity.getDisplayName()))
  80     customHtml = ClientHtml.addDescriptionTag(customHtml, escapeHTML(entity.description))
  81     customHtml = ClientHtml.addAccountOrChannelMetaTags(customHtml, entity)
  82
  83     return customHtml
  84   }
  85
  86   private static async getIndexHTML (req: express.Request, res: express.Response, paramLang?: string) {
  87     const path = ClientHtml.getIndexPath(req, res, paramLang)
  88     if (ClientHtml.htmlCache[ path ]) return ClientHtml.htmlCache[ path ]
  89
  90     const buffer = await readFile(path)
  91
  92     let html = buffer.toString()
  93
  94     html = ClientHtml.addCustomCSS(html)
  95     html = await ClientHtml.addAsyncPluginCSS(html)
  96
  97     ClientHtml.htmlCache[ path ] = html
  98
  99     return html
 100   }
 101
 102   private static getIndexPath (req: express.Request, res: express.Response, paramLang?: string) {
 103     let lang: string
 104
 105     // Check param lang validity
 106     if (paramLang && is18nLocale(paramLang)) {
 107       lang = paramLang
 108
 109       // Save locale in cookies
 110       res.cookie('clientLanguage', lang, {
 111         secure: WEBSERVER.SCHEME === 'https',
 112         sameSite: true,
 113         maxAge: 1000 * 3600 * 24 * 90 // 3 months
 114       })
 115
 116     } else if (req.cookies.clientLanguage && is18nLocale(req.cookies.clientLanguage)) {
 117       lang = req.cookies.clientLanguage
 118     } else {
 119       lang = req.acceptsLanguages(POSSIBLE_LOCALES) || getDefaultLocale()
 120     }
 121
 122     return join(__dirname, '../../../client/dist/' + buildFileLocale(lang) + '/index.html')
 123   }
 124
 125   private static addTitleTag (htmlStringPage: string, title?: string) {
 126     let text = title || CONFIG.INSTANCE.NAME
 127     if (title) text += ` - ${CONFIG.INSTANCE.NAME}`
 128
 129     const titleTag = `<title>${text}</title>`
 130
 131     return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.TITLE, titleTag)
 132   }
 133
 134   private static addDescriptionTag (htmlStringPage: string, description?: string) {
 135     const content = description || CONFIG.INSTANCE.SHORT_DESCRIPTION
 136     const descriptionTag = `<meta name="description" content="${content}" />`
 137
 138     return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.DESCRIPTION, descriptionTag)
 139   }
 140
 141   private static addCustomCSS (htmlStringPage: string) {
 142     const styleTag = `<style class="custom-css-style">${CONFIG.INSTANCE.CUSTOMIZATIONS.CSS}</style>`
 143
 144     return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.CUSTOM_CSS, styleTag)
 145   }
 146
 147   private static async addAsyncPluginCSS (htmlStringPage: string) {
 148     const globalCSSContent = await readFile(PLUGIN_GLOBAL_CSS_PATH)
 149     if (!globalCSSContent) return htmlStringPage
 150
 151     const fileHash = sha256(globalCSSContent)
 152     const linkTag = `<link rel="stylesheet" href="/plugins/global.css?hash=${fileHash}" />`
 153
 154     return htmlStringPage.replace('</head>', linkTag + '</head>')
 155   }
 156
 157   private static addVideoOpenGraphAndOEmbedTags (htmlStringPage: string, video: VideoModel) {
 158     const previewUrl = WEBSERVER.URL + video.getPreviewStaticPath()
 159     const videoUrl = WEBSERVER.URL + video.getWatchStaticPath()
 160
 161     const videoNameEscaped = escapeHTML(video.name)
 162     const videoDescriptionEscaped = escapeHTML(video.description)
 163     const embedUrl = WEBSERVER.URL + video.getEmbedStaticPath()
 164
 165     const openGraphMetaTags = {
 166       'og:type': 'video',
 167       'og:title': videoNameEscaped,
 168       'og:image': previewUrl,
 169       'og:url': videoUrl,
 170       'og:description': videoDescriptionEscaped,
 171
 172       'og:video:url': embedUrl,
 173       'og:video:secure_url': embedUrl,
 174       'og:video:type': 'text/html',
 175       'og:video:width': EMBED_SIZE.width,
 176       'og:video:height': EMBED_SIZE.height,
 177
 178       'name': videoNameEscaped,
 179       'description': videoDescriptionEscaped,
 180       'image': previewUrl,
 181
 182       'twitter:card': CONFIG.SERVICES.TWITTER.WHITELISTED ? 'player' : 'summary_large_image',
 183       'twitter:site': CONFIG.SERVICES.TWITTER.USERNAME,
 184       'twitter:title': videoNameEscaped,
 185       'twitter:description': videoDescriptionEscaped,
 186       'twitter:image': previewUrl,
 187       'twitter:player': embedUrl,
 188       'twitter:player:width': EMBED_SIZE.width,
 189       'twitter:player:height': EMBED_SIZE.height
 190     }
 191
 192     const oembedLinkTags = [
 193       {
 194         type: 'application/json+oembed',
 195         href: WEBSERVER.URL + '/services/oembed?url=' + encodeURIComponent(videoUrl),
 196         title: videoNameEscaped
 197       }
 198     ]
 199
 200     const schemaTags = {
 201       '@context': 'http://schema.org',
 202       '@type': 'VideoObject',
 203       name: videoNameEscaped,
 204       description: videoDescriptionEscaped,
 205       thumbnailUrl: previewUrl,
 206       uploadDate: video.createdAt.toISOString(),
 207       duration: getActivityStreamDuration(video.duration),
 208       contentUrl: videoUrl,
 209       embedUrl: embedUrl,
 210       interactionCount: video.views
 211     }
 212
 213     let tagsString = ''
 214
 215     // Opengraph
 216     Object.keys(openGraphMetaTags).forEach(tagName => {
 217       const tagValue = openGraphMetaTags[ tagName ]
 218
 219       tagsString += `<meta property="${tagName}" content="${tagValue}" />`
 220     })
 221
 222     // OEmbed
 223     for (const oembedLinkTag of oembedLinkTags) {
 224       tagsString += `<link rel="alternate" type="${oembedLinkTag.type}" href="${oembedLinkTag.href}" title="${oembedLinkTag.title}" />`
 225     }
 226
 227     // Schema.org
 228     tagsString += `<script type="application/ld+json">${JSON.stringify(schemaTags)}</script>`
 229
 230     // SEO, use origin video url so Google does not index remote videos
 231     tagsString += `<link rel="canonical" href="${video.url}" />`
 232
 233     return this.addOpenGraphAndOEmbedTags(htmlStringPage, tagsString)
 234   }
 235
 236   private static addAccountOrChannelMetaTags (htmlStringPage: string, entity: AccountModel | VideoChannelModel) {
 237     // SEO, use origin account or channel URL
 238     const metaTags = `<link rel="canonical" href="${entity.Actor.url}" />`
 239
 240     return this.addOpenGraphAndOEmbedTags(htmlStringPage, metaTags)
 241   }
 242
 243   private static addOpenGraphAndOEmbedTags (htmlStringPage: string, metaTags: string) {
 244     return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.META_TAGS, metaTags)
 245   }
 246 }