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 import { logger } from '../helpers/logger'
  16
  17 export class ClientHtml {
  18
  19   private static htmlCache: { [ path: string ]: string } = {}
  20
  21   static invalidCache () {
  22     logger.info('Cleaning HTML cache.')
  23
  24     ClientHtml.htmlCache = {}
  25   }
  26
  27   static async getDefaultHTMLPage (req: express.Request, res: express.Response, paramLang?: string) {
  28     const html = await ClientHtml.getIndexHTML(req, res, paramLang)
  29
  30     let customHtml = ClientHtml.addTitleTag(html)
  31     customHtml = ClientHtml.addDescriptionTag(customHtml)
  32
  33     return customHtml
  34   }
  35
  36   static async getWatchHTMLPage (videoId: string, req: express.Request, res: express.Response) {
  37     // Let Angular application handle errors
  38     if (!validator.isInt(videoId) && !validator.isUUID(videoId, 4)) {
  39       return ClientHtml.getIndexHTML(req, res)
  40     }
  41
  42     const [ html, video ] = await Promise.all([
  43       ClientHtml.getIndexHTML(req, res),
  44       VideoModel.loadAndPopulateAccountAndServerAndTags(videoId)
  45     ])
  46
  47     // Let Angular application handle errors
  48     if (!video || video.privacy === VideoPrivacy.PRIVATE) {
  49       return ClientHtml.getIndexHTML(req, res)
  50     }
  51
  52     let customHtml = ClientHtml.addTitleTag(html, escapeHTML(video.name))
  53     customHtml = ClientHtml.addDescriptionTag(customHtml, escapeHTML(video.description))
  54     customHtml = ClientHtml.addVideoOpenGraphAndOEmbedTags(customHtml, video)
  55
  56     return customHtml
  57   }
  58
  59   static async getAccountHTMLPage (nameWithHost: string, req: express.Request, res: express.Response) {
  60     return this.getAccountOrChannelHTMLPage(() => AccountModel.loadByNameWithHost(nameWithHost), req, res)
  61   }
  62
  63   static async getVideoChannelHTMLPage (nameWithHost: string, req: express.Request, res: express.Response) {
  64     return this.getAccountOrChannelHTMLPage(() => VideoChannelModel.loadByNameWithHostAndPopulateAccount(nameWithHost), req, res)
  65   }
  66
  67   private static async getAccountOrChannelHTMLPage (
  68     loader: () => Bluebird<AccountModel | VideoChannelModel>,
  69     req: express.Request,
  70     res: express.Response
  71   ) {
  72     const [ html, entity ] = await Promise.all([
  73       ClientHtml.getIndexHTML(req, res),
  74       loader()
  75     ])
  76
  77     // Let Angular application handle errors
  78     if (!entity) {
  79       return ClientHtml.getIndexHTML(req, res)
  80     }
  81
  82     let customHtml = ClientHtml.addTitleTag(html, escapeHTML(entity.getDisplayName()))
  83     customHtml = ClientHtml.addDescriptionTag(customHtml, escapeHTML(entity.description))
  84     customHtml = ClientHtml.addAccountOrChannelMetaTags(customHtml, entity)
  85
  86     return customHtml
  87   }
  88
  89   private static async getIndexHTML (req: express.Request, res: express.Response, paramLang?: string) {
  90     const path = ClientHtml.getIndexPath(req, res, paramLang)
  91     if (ClientHtml.htmlCache[ path ]) return ClientHtml.htmlCache[ path ]
  92
  93     const buffer = await readFile(path)
  94
  95     let html = buffer.toString()
  96
  97     html = ClientHtml.addCustomCSS(html)
  98     html = await ClientHtml.addAsyncPluginCSS(html)
  99
 100     ClientHtml.htmlCache[ path ] = html
 101
 102     return html
 103   }
 104
 105   private static getIndexPath (req: express.Request, res: express.Response, paramLang?: string) {
 106     let lang: string
 107
 108     // Check param lang validity
 109     if (paramLang && is18nLocale(paramLang)) {
 110       lang = paramLang
 111
 112       // Save locale in cookies
 113       res.cookie('clientLanguage', lang, {
 114         secure: WEBSERVER.SCHEME === 'https',
 115         sameSite: true,
 116         maxAge: 1000 * 3600 * 24 * 90 // 3 months
 117       })
 118
 119     } else if (req.cookies.clientLanguage && is18nLocale(req.cookies.clientLanguage)) {
 120       lang = req.cookies.clientLanguage
 121     } else {
 122       lang = req.acceptsLanguages(POSSIBLE_LOCALES) || getDefaultLocale()
 123     }
 124
 125     return join(__dirname, '../../../client/dist/' + buildFileLocale(lang) + '/index.html')
 126   }
 127
 128   private static addTitleTag (htmlStringPage: string, title?: string) {
 129     let text = title || CONFIG.INSTANCE.NAME
 130     if (title) text += ` - ${CONFIG.INSTANCE.NAME}`
 131
 132     const titleTag = `<title>${text}</title>`
 133
 134     return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.TITLE, titleTag)
 135   }
 136
 137   private static addDescriptionTag (htmlStringPage: string, description?: string) {
 138     const content = description || CONFIG.INSTANCE.SHORT_DESCRIPTION
 139     const descriptionTag = `<meta name="description" content="${content}" />`
 140
 141     return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.DESCRIPTION, descriptionTag)
 142   }
 143
 144   private static addCustomCSS (htmlStringPage: string) {
 145     const styleTag = `<style class="custom-css-style">${CONFIG.INSTANCE.CUSTOMIZATIONS.CSS}</style>`
 146
 147     return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.CUSTOM_CSS, styleTag)
 148   }
 149
 150   private static async addAsyncPluginCSS (htmlStringPage: string) {
 151     const globalCSSContent = await readFile(PLUGIN_GLOBAL_CSS_PATH)
 152     if (globalCSSContent.byteLength === 0) return htmlStringPage
 153
 154     const fileHash = sha256(globalCSSContent)
 155     const linkTag = `<link rel="stylesheet" href="/plugins/global.css?hash=${fileHash}" />`
 156
 157     return htmlStringPage.replace('</head>', linkTag + '</head>')
 158   }
 159
 160   private static addVideoOpenGraphAndOEmbedTags (htmlStringPage: string, video: VideoModel) {
 161     const previewUrl = WEBSERVER.URL + video.getPreviewStaticPath()
 162     const videoUrl = WEBSERVER.URL + video.getWatchStaticPath()
 163
 164     const videoNameEscaped = escapeHTML(video.name)
 165     const videoDescriptionEscaped = escapeHTML(video.description)
 166     const embedUrl = WEBSERVER.URL + video.getEmbedStaticPath()
 167
 168     const openGraphMetaTags = {
 169       'og:type': 'video',
 170       'og:title': videoNameEscaped,
 171       'og:image': previewUrl,
 172       'og:url': videoUrl,
 173       'og:description': videoDescriptionEscaped,
 174
 175       'og:video:url': embedUrl,
 176       'og:video:secure_url': embedUrl,
 177       'og:video:type': 'text/html',
 178       'og:video:width': EMBED_SIZE.width,
 179       'og:video:height': EMBED_SIZE.height,
 180
 181       'name': videoNameEscaped,
 182       'description': videoDescriptionEscaped,
 183       'image': previewUrl,
 184
 185       'twitter:card': CONFIG.SERVICES.TWITTER.WHITELISTED ? 'player' : 'summary_large_image',
 186       'twitter:site': CONFIG.SERVICES.TWITTER.USERNAME,
 187       'twitter:title': videoNameEscaped,
 188       'twitter:description': videoDescriptionEscaped,
 189       'twitter:image': previewUrl,
 190       'twitter:player': embedUrl,
 191       'twitter:player:width': EMBED_SIZE.width,
 192       'twitter:player:height': EMBED_SIZE.height
 193     }
 194
 195     const oembedLinkTags = [
 196       {
 197         type: 'application/json+oembed',
 198         href: WEBSERVER.URL + '/services/oembed?url=' + encodeURIComponent(videoUrl),
 199         title: videoNameEscaped
 200       }
 201     ]
 202
 203     const schemaTags = {
 204       '@context': 'http://schema.org',
 205       '@type': 'VideoObject',
 206       name: videoNameEscaped,
 207       description: videoDescriptionEscaped,
 208       thumbnailUrl: previewUrl,
 209       uploadDate: video.createdAt.toISOString(),
 210       duration: getActivityStreamDuration(video.duration),
 211       contentUrl: videoUrl,
 212       embedUrl: embedUrl,
 213       interactionCount: video.views
 214     }
 215
 216     let tagsString = ''
 217
 218     // Opengraph
 219     Object.keys(openGraphMetaTags).forEach(tagName => {
 220       const tagValue = openGraphMetaTags[ tagName ]
 221
 222       tagsString += `<meta property="${tagName}" content="${tagValue}" />`
 223     })
 224
 225     // OEmbed
 226     for (const oembedLinkTag of oembedLinkTags) {
 227       tagsString += `<link rel="alternate" type="${oembedLinkTag.type}" href="${oembedLinkTag.href}" title="${oembedLinkTag.title}" />`
 228     }
 229
 230     // Schema.org
 231     tagsString += `<script type="application/ld+json">${JSON.stringify(schemaTags)}</script>`
 232
 233     // SEO, use origin video url so Google does not index remote videos
 234     tagsString += `<link rel="canonical" href="${video.url}" />`
 235
 236     return this.addOpenGraphAndOEmbedTags(htmlStringPage, tagsString)
 237   }
 238
 239   private static addAccountOrChannelMetaTags (htmlStringPage: string, entity: AccountModel | VideoChannelModel) {
 240     // SEO, use origin account or channel URL
 241     const metaTags = `<link rel="canonical" href="${entity.Actor.url}" />`
 242
 243     return this.addOpenGraphAndOEmbedTags(htmlStringPage, metaTags)
 244   }
 245
 246   private static addOpenGraphAndOEmbedTags (htmlStringPage: string, metaTags: string) {
 247     return htmlStringPage.replace(CUSTOM_HTML_TAG_COMMENTS.META_TAGS, metaTags)
 248   }
 249 }