Instance homepage support (#4007)

* Prepare homepage parsers

* Add ability to update instance hompage

* Add ability to set homepage as landing page

* Add homepage preview in admin

* Dynamically update left menu for homepage

* Inject home content in homepage

* Add videos list and channel miniature custom markup

* Remove unused elements in markup service

5 files changed, 311 insertions, 282 deletions

diff --git a/server/lib/client-html.ts b/server/lib/client-html.ts
index 85fdc8754..4b2968e8b 100644
--- a/server/lib/client-html.ts
+++ b/server/lib/client-html.ts
@@ -26,7 +26,7 @@ import { VideoChannelModel } from '../models/video/video-channel'
 import { getActivityStreamDuration } from '../models/video/video-format-utils'
 import { VideoPlaylistModel } from '../models/video/video-playlist'
 import { MAccountActor, MChannelActor } from '../types/models'
-import { getHTMLServerConfig } from './config'
+import { ServerConfigManager } from './server-config-manager'
 
 type Tags = {
   ogType: string
@@ -211,7 +211,7 @@ class ClientHtml {
     if (!isTestInstance() && ClientHtml.htmlCache[path]) return ClientHtml.htmlCache[path]
 
     const buffer = await readFile(path)
-    const serverConfig = await getHTMLServerConfig()
+    const serverConfig = await ServerConfigManager.Instance.getHTMLServerConfig()
 
     let html = buffer.toString()
     html = await ClientHtml.addAsyncPluginCSS(html)
@@ -280,7 +280,7 @@ class ClientHtml {
     if (!isTestInstance() && ClientHtml.htmlCache[path]) return ClientHtml.htmlCache[path]
 
     const buffer = await readFile(path)
-    const serverConfig = await getHTMLServerConfig()
+    const serverConfig = await ServerConfigManager.Instance.getHTMLServerConfig()
 
     let html = buffer.toString()
 
diff --git a/server/lib/config.ts b/server/lib/config.ts
deleted file mode 100644
index 18d49f05a..000000000
--- a/server/lib/config.ts
+++ /dev/null
@@ -1,274 +0,0 @@
-import { isSignupAllowed, isSignupAllowedForCurrentIP } from '@server/helpers/signup'
-import { getServerCommit } from '@server/helpers/utils'
-import { CONFIG, isEmailEnabled } from '@server/initializers/config'
-import { CONSTRAINTS_FIELDS, DEFAULT_THEME_NAME, PEERTUBE_VERSION } from '@server/initializers/constants'
-import { HTMLServerConfig, RegisteredExternalAuthConfig, RegisteredIdAndPassAuthConfig, ServerConfig } from '@shared/models'
-import { Hooks } from './plugins/hooks'
-import { PluginManager } from './plugins/plugin-manager'
-import { getThemeOrDefault } from './plugins/theme-utils'
-import { VideoTranscodingProfilesManager } from './transcoding/video-transcoding-profiles'
-
-async function getServerConfig (ip?: string): Promise<ServerConfig> {
-  const { allowed } = await Hooks.wrapPromiseFun(
-    isSignupAllowed,
-    {
-      ip
-    },
-    'filter:api.user.signup.allowed.result'
-  )
-
-  const allowedForCurrentIP = isSignupAllowedForCurrentIP(ip)
-
-  const signup = {
-    allowed,
-    allowedForCurrentIP,
-    requiresEmailVerification: CONFIG.SIGNUP.REQUIRES_EMAIL_VERIFICATION
-  }
-
-  const htmlConfig = await getHTMLServerConfig()
-
-  return { ...htmlConfig, signup }
-}
-
-// Config injected in HTML
-let serverCommit: string
-async function getHTMLServerConfig (): Promise<HTMLServerConfig> {
-  if (serverCommit === undefined) serverCommit = await getServerCommit()
-
-  const defaultTheme = getThemeOrDefault(CONFIG.THEME.DEFAULT, DEFAULT_THEME_NAME)
-
-  return {
-    instance: {
-      name: CONFIG.INSTANCE.NAME,
-      shortDescription: CONFIG.INSTANCE.SHORT_DESCRIPTION,
-      isNSFW: CONFIG.INSTANCE.IS_NSFW,
-      defaultNSFWPolicy: CONFIG.INSTANCE.DEFAULT_NSFW_POLICY,
-      defaultClientRoute: CONFIG.INSTANCE.DEFAULT_CLIENT_ROUTE,
-      customizations: {
-        javascript: CONFIG.INSTANCE.CUSTOMIZATIONS.JAVASCRIPT,
-        css: CONFIG.INSTANCE.CUSTOMIZATIONS.CSS
-      }
-    },
-    search: {
-      remoteUri: {
-        users: CONFIG.SEARCH.REMOTE_URI.USERS,
-        anonymous: CONFIG.SEARCH.REMOTE_URI.ANONYMOUS
-      },
-      searchIndex: {
-        enabled: CONFIG.SEARCH.SEARCH_INDEX.ENABLED,
-        url: CONFIG.SEARCH.SEARCH_INDEX.URL,
-        disableLocalSearch: CONFIG.SEARCH.SEARCH_INDEX.DISABLE_LOCAL_SEARCH,
-        isDefaultSearch: CONFIG.SEARCH.SEARCH_INDEX.IS_DEFAULT_SEARCH
-      }
-    },
-    plugin: {
-      registered: getRegisteredPlugins(),
-      registeredExternalAuths: getExternalAuthsPlugins(),
-      registeredIdAndPassAuths: getIdAndPassAuthPlugins()
-    },
-    theme: {
-      registered: getRegisteredThemes(),
-      default: defaultTheme
-    },
-    email: {
-      enabled: isEmailEnabled()
-    },
-    contactForm: {
-      enabled: CONFIG.CONTACT_FORM.ENABLED
-    },
-    serverVersion: PEERTUBE_VERSION,
-    serverCommit,
-    transcoding: {
-      hls: {
-        enabled: CONFIG.TRANSCODING.HLS.ENABLED
-      },
-      webtorrent: {
-        enabled: CONFIG.TRANSCODING.WEBTORRENT.ENABLED
-      },
-      enabledResolutions: getEnabledResolutions('vod'),
-      profile: CONFIG.TRANSCODING.PROFILE,
-      availableProfiles: VideoTranscodingProfilesManager.Instance.getAvailableProfiles('vod')
-    },
-    live: {
-      enabled: CONFIG.LIVE.ENABLED,
-
-      allowReplay: CONFIG.LIVE.ALLOW_REPLAY,
-      maxDuration: CONFIG.LIVE.MAX_DURATION,
-      maxInstanceLives: CONFIG.LIVE.MAX_INSTANCE_LIVES,
-      maxUserLives: CONFIG.LIVE.MAX_USER_LIVES,
-
-      transcoding: {
-        enabled: CONFIG.LIVE.TRANSCODING.ENABLED,
-        enabledResolutions: getEnabledResolutions('live'),
-        profile: CONFIG.LIVE.TRANSCODING.PROFILE,
-        availableProfiles: VideoTranscodingProfilesManager.Instance.getAvailableProfiles('live')
-      },
-
-      rtmp: {
-        port: CONFIG.LIVE.RTMP.PORT
-      }
-    },
-    import: {
-      videos: {
-        http: {
-          enabled: CONFIG.IMPORT.VIDEOS.HTTP.ENABLED
-        },
-        torrent: {
-          enabled: CONFIG.IMPORT.VIDEOS.TORRENT.ENABLED
-        }
-      }
-    },
-    autoBlacklist: {
-      videos: {
-        ofUsers: {
-          enabled: CONFIG.AUTO_BLACKLIST.VIDEOS.OF_USERS.ENABLED
-        }
-      }
-    },
-    avatar: {
-      file: {
-        size: {
-          max: CONSTRAINTS_FIELDS.ACTORS.IMAGE.FILE_SIZE.max
-        },
-        extensions: CONSTRAINTS_FIELDS.ACTORS.IMAGE.EXTNAME
-      }
-    },
-    banner: {
-      file: {
-        size: {
-          max: CONSTRAINTS_FIELDS.ACTORS.IMAGE.FILE_SIZE.max
-        },
-        extensions: CONSTRAINTS_FIELDS.ACTORS.IMAGE.EXTNAME
-      }
-    },
-    video: {
-      image: {
-        extensions: CONSTRAINTS_FIELDS.VIDEOS.IMAGE.EXTNAME,
-        size: {
-          max: CONSTRAINTS_FIELDS.VIDEOS.IMAGE.FILE_SIZE.max
-        }
-      },
-      file: {
-        extensions: CONSTRAINTS_FIELDS.VIDEOS.EXTNAME
-      }
-    },
-    videoCaption: {
-      file: {
-        size: {
-          max: CONSTRAINTS_FIELDS.VIDEO_CAPTIONS.CAPTION_FILE.FILE_SIZE.max
-        },
-        extensions: CONSTRAINTS_FIELDS.VIDEO_CAPTIONS.CAPTION_FILE.EXTNAME
-      }
-    },
-    user: {
-      videoQuota: CONFIG.USER.VIDEO_QUOTA,
-      videoQuotaDaily: CONFIG.USER.VIDEO_QUOTA_DAILY
-    },
-    trending: {
-      videos: {
-        intervalDays: CONFIG.TRENDING.VIDEOS.INTERVAL_DAYS,
-        algorithms: {
-          enabled: CONFIG.TRENDING.VIDEOS.ALGORITHMS.ENABLED,
-          default: CONFIG.TRENDING.VIDEOS.ALGORITHMS.DEFAULT
-        }
-      }
-    },
-    tracker: {
-      enabled: CONFIG.TRACKER.ENABLED
-    },
-
-    followings: {
-      instance: {
-        autoFollowIndex: {
-          indexUrl: CONFIG.FOLLOWINGS.INSTANCE.AUTO_FOLLOW_INDEX.INDEX_URL
-        }
-      }
-    },
-
-    broadcastMessage: {
-      enabled: CONFIG.BROADCAST_MESSAGE.ENABLED,
-      message: CONFIG.BROADCAST_MESSAGE.MESSAGE,
-      level: CONFIG.BROADCAST_MESSAGE.LEVEL,
-      dismissable: CONFIG.BROADCAST_MESSAGE.DISMISSABLE
-    }
-  }
-}
-
-function getRegisteredThemes () {
-  return PluginManager.Instance.getRegisteredThemes()
-                      .map(t => ({
-                        name: t.name,
-                        version: t.version,
-                        description: t.description,
-                        css: t.css,
-                        clientScripts: t.clientScripts
-                      }))
-}
-
-function getRegisteredPlugins () {
-  return PluginManager.Instance.getRegisteredPlugins()
-                      .map(p => ({
-                        name: p.name,
-                        version: p.version,
-                        description: p.description,
-                        clientScripts: p.clientScripts
-                      }))
-}
-
-function getEnabledResolutions (type: 'vod' | 'live') {
-  const transcoding = type === 'vod'
-    ? CONFIG.TRANSCODING
-    : CONFIG.LIVE.TRANSCODING
-
-  return Object.keys(transcoding.RESOLUTIONS)
-               .filter(key => transcoding.ENABLED && transcoding.RESOLUTIONS[key] === true)
-               .map(r => parseInt(r, 10))
-}
-
-// ---------------------------------------------------------------------------
-
-export {
-  getServerConfig,
-  getRegisteredThemes,
-  getEnabledResolutions,
-  getRegisteredPlugins,
-  getHTMLServerConfig
-}
-
-// ---------------------------------------------------------------------------
-
-function getIdAndPassAuthPlugins () {
-  const result: RegisteredIdAndPassAuthConfig[] = []
-
-  for (const p of PluginManager.Instance.getIdAndPassAuths()) {
-    for (const auth of p.idAndPassAuths) {
-      result.push({
-        npmName: p.npmName,
-        name: p.name,
-        version: p.version,
-        authName: auth.authName,
-        weight: auth.getWeight()
-      })
-    }
-  }
-
-  return result
-}
-
-function getExternalAuthsPlugins () {
-  const result: RegisteredExternalAuthConfig[] = []
-
-  for (const p of PluginManager.Instance.getExternalAuths()) {
-    for (const auth of p.externalAuths) {
-      result.push({
-        npmName: p.npmName,
-        name: p.name,
-        version: p.version,
-        authName: auth.authName,
-        authDisplayName: auth.authDisplayName()
-      })
-    }
-  }
-
-  return result
-}
diff --git a/server/lib/job-queue/handlers/video-import.ts b/server/lib/job-queue/handlers/video-import.ts
index 3067ce214..d71053e87 100644
--- a/server/lib/job-queue/handlers/video-import.ts
+++ b/server/lib/job-queue/handlers/video-import.ts
@@ -2,8 +2,10 @@ import * as Bull from 'bull'
 import { move, remove, stat } from 'fs-extra'
 import { extname } from 'path'
 import { retryTransactionWrapper } from '@server/helpers/database-utils'
+import { YoutubeDL } from '@server/helpers/youtube-dl'
 import { isPostImportVideoAccepted } from '@server/lib/moderation'
 import { Hooks } from '@server/lib/plugins/hooks'
+import { ServerConfigManager } from '@server/lib/server-config-manager'
 import { isAbleToUploadVideo } from '@server/lib/user'
 import { addOptimizeOrMergeAudioJob } from '@server/lib/video'
 import { generateVideoFilename, getVideoFilePath } from '@server/lib/video-paths'
@@ -33,8 +35,6 @@ import { MThumbnail } from '../../../types/models/video/thumbnail'
 import { federateVideoIfNeeded } from '../../activitypub/videos'
 import { Notifier } from '../../notifier'
 import { generateVideoMiniature } from '../../thumbnail'
-import { YoutubeDL } from '@server/helpers/youtube-dl'
-import { getEnabledResolutions } from '@server/lib/config'
 
 async function processVideoImport (job: Bull.Job) {
   const payload = job.data as VideoImportPayload
@@ -76,7 +76,7 @@ async function processYoutubeDLImport (job: Bull.Job, payload: VideoImportYoutub
     videoImportId: videoImport.id
   }
 
-  const youtubeDL = new YoutubeDL(videoImport.targetUrl, getEnabledResolutions('vod'))
+  const youtubeDL = new YoutubeDL(videoImport.targetUrl, ServerConfigManager.Instance.getEnabledResolutions('vod'))
 
   return processFile(
     () => youtubeDL.downloadYoutubeDLVideo(payload.fileExt, VIDEO_IMPORT_TIMEOUT),
diff --git a/server/lib/plugins/plugin-helpers-builder.ts b/server/lib/plugins/plugin-helpers-builder.ts
index cb1cd4d9a..8487672ba 100644
--- a/server/lib/plugins/plugin-helpers-builder.ts
+++ b/server/lib/plugins/plugin-helpers-builder.ts
@@ -15,7 +15,7 @@ import { MPlugin } from '@server/types/models'
 import { PeerTubeHelpers } from '@server/types/plugins'
 import { VideoBlacklistCreate } from '@shared/models'
 import { addAccountInBlocklist, addServerInBlocklist, removeAccountFromBlocklist, removeServerFromBlocklist } from '../blocklist'
-import { getServerConfig } from '../config'
+import { ServerConfigManager } from '../server-config-manager'
 import { blacklistVideo, unblacklistVideo } from '../video-blacklist'
 import { UserModel } from '@server/models/user/user'
 
@@ -147,7 +147,7 @@ function buildConfigHelpers () {
     },
 
     getServerConfig () {
-      return getServerConfig()
+      return ServerConfigManager.Instance.getServerConfig()
     }
   }
 }
diff --git a/server/lib/server-config-manager.ts b/server/lib/server-config-manager.ts
new file mode 100644
index 000000000..1aff6f446
--- /dev/null
+++ b/server/lib/server-config-manager.ts
@@ -0,0 +1,303 @@
+import { isSignupAllowed, isSignupAllowedForCurrentIP } from '@server/helpers/signup'
+import { getServerCommit } from '@server/helpers/utils'
+import { CONFIG, isEmailEnabled } from '@server/initializers/config'
+import { CONSTRAINTS_FIELDS, DEFAULT_THEME_NAME, PEERTUBE_VERSION } from '@server/initializers/constants'
+import { ActorCustomPageModel } from '@server/models/account/actor-custom-page'
+import { HTMLServerConfig, RegisteredExternalAuthConfig, RegisteredIdAndPassAuthConfig, ServerConfig } from '@shared/models'
+import { Hooks } from './plugins/hooks'
+import { PluginManager } from './plugins/plugin-manager'
+import { getThemeOrDefault } from './plugins/theme-utils'
+import { VideoTranscodingProfilesManager } from './transcoding/video-transcoding-profiles'
+
+/**
+ *
+ * Used to send the server config to clients (using REST/API or plugins API)
+ * We need a singleton class to manage config state depending on external events (to build menu entries etc)
+ *
+ */
+
+class ServerConfigManager {
+
+  private static instance: ServerConfigManager
+
+  private serverCommit: string
+
+  private homepageEnabled = false
+
+  private constructor () {}
+
+  async init () {
+    const instanceHomepage = await ActorCustomPageModel.loadInstanceHomepage()
+
+    this.updateHomepageState(instanceHomepage?.content)
+  }
+
+  updateHomepageState (content: string) {
+    this.homepageEnabled = !!content
+  }
+
+  async getHTMLServerConfig (): Promise<HTMLServerConfig> {
+    if (this.serverCommit === undefined) this.serverCommit = await getServerCommit()
+
+    const defaultTheme = getThemeOrDefault(CONFIG.THEME.DEFAULT, DEFAULT_THEME_NAME)
+
+    return {
+      instance: {
+        name: CONFIG.INSTANCE.NAME,
+        shortDescription: CONFIG.INSTANCE.SHORT_DESCRIPTION,
+        isNSFW: CONFIG.INSTANCE.IS_NSFW,
+        defaultNSFWPolicy: CONFIG.INSTANCE.DEFAULT_NSFW_POLICY,
+        defaultClientRoute: CONFIG.INSTANCE.DEFAULT_CLIENT_ROUTE,
+        customizations: {
+          javascript: CONFIG.INSTANCE.CUSTOMIZATIONS.JAVASCRIPT,
+          css: CONFIG.INSTANCE.CUSTOMIZATIONS.CSS
+        }
+      },
+      search: {
+        remoteUri: {
+          users: CONFIG.SEARCH.REMOTE_URI.USERS,
+          anonymous: CONFIG.SEARCH.REMOTE_URI.ANONYMOUS
+        },
+        searchIndex: {
+          enabled: CONFIG.SEARCH.SEARCH_INDEX.ENABLED,
+          url: CONFIG.SEARCH.SEARCH_INDEX.URL,
+          disableLocalSearch: CONFIG.SEARCH.SEARCH_INDEX.DISABLE_LOCAL_SEARCH,
+          isDefaultSearch: CONFIG.SEARCH.SEARCH_INDEX.IS_DEFAULT_SEARCH
+        }
+      },
+      plugin: {
+        registered: this.getRegisteredPlugins(),
+        registeredExternalAuths: this.getExternalAuthsPlugins(),
+        registeredIdAndPassAuths: this.getIdAndPassAuthPlugins()
+      },
+      theme: {
+        registered: this.getRegisteredThemes(),
+        default: defaultTheme
+      },
+      email: {
+        enabled: isEmailEnabled()
+      },
+      contactForm: {
+        enabled: CONFIG.CONTACT_FORM.ENABLED
+      },
+      serverVersion: PEERTUBE_VERSION,
+      serverCommit: this.serverCommit,
+      transcoding: {
+        hls: {
+          enabled: CONFIG.TRANSCODING.HLS.ENABLED
+        },
+        webtorrent: {
+          enabled: CONFIG.TRANSCODING.WEBTORRENT.ENABLED
+        },
+        enabledResolutions: this.getEnabledResolutions('vod'),
+        profile: CONFIG.TRANSCODING.PROFILE,
+        availableProfiles: VideoTranscodingProfilesManager.Instance.getAvailableProfiles('vod')
+      },
+      live: {
+        enabled: CONFIG.LIVE.ENABLED,
+
+        allowReplay: CONFIG.LIVE.ALLOW_REPLAY,
+        maxDuration: CONFIG.LIVE.MAX_DURATION,
+        maxInstanceLives: CONFIG.LIVE.MAX_INSTANCE_LIVES,
+        maxUserLives: CONFIG.LIVE.MAX_USER_LIVES,
+
+        transcoding: {
+          enabled: CONFIG.LIVE.TRANSCODING.ENABLED,
+          enabledResolutions: this.getEnabledResolutions('live'),
+          profile: CONFIG.LIVE.TRANSCODING.PROFILE,
+          availableProfiles: VideoTranscodingProfilesManager.Instance.getAvailableProfiles('live')
+        },
+
+        rtmp: {
+          port: CONFIG.LIVE.RTMP.PORT
+        }
+      },
+      import: {
+        videos: {
+          http: {
+            enabled: CONFIG.IMPORT.VIDEOS.HTTP.ENABLED
+          },
+          torrent: {
+            enabled: CONFIG.IMPORT.VIDEOS.TORRENT.ENABLED
+          }
+        }
+      },
+      autoBlacklist: {
+        videos: {
+          ofUsers: {
+            enabled: CONFIG.AUTO_BLACKLIST.VIDEOS.OF_USERS.ENABLED
+          }
+        }
+      },
+      avatar: {
+        file: {
+          size: {
+            max: CONSTRAINTS_FIELDS.ACTORS.IMAGE.FILE_SIZE.max
+          },
+          extensions: CONSTRAINTS_FIELDS.ACTORS.IMAGE.EXTNAME
+        }
+      },
+      banner: {
+        file: {
+          size: {
+            max: CONSTRAINTS_FIELDS.ACTORS.IMAGE.FILE_SIZE.max
+          },
+          extensions: CONSTRAINTS_FIELDS.ACTORS.IMAGE.EXTNAME
+        }
+      },
+      video: {
+        image: {
+          extensions: CONSTRAINTS_FIELDS.VIDEOS.IMAGE.EXTNAME,
+          size: {
+            max: CONSTRAINTS_FIELDS.VIDEOS.IMAGE.FILE_SIZE.max
+          }
+        },
+        file: {
+          extensions: CONSTRAINTS_FIELDS.VIDEOS.EXTNAME
+        }
+      },
+      videoCaption: {
+        file: {
+          size: {
+            max: CONSTRAINTS_FIELDS.VIDEO_CAPTIONS.CAPTION_FILE.FILE_SIZE.max
+          },
+          extensions: CONSTRAINTS_FIELDS.VIDEO_CAPTIONS.CAPTION_FILE.EXTNAME
+        }
+      },
+      user: {
+        videoQuota: CONFIG.USER.VIDEO_QUOTA,
+        videoQuotaDaily: CONFIG.USER.VIDEO_QUOTA_DAILY
+      },
+      trending: {
+        videos: {
+          intervalDays: CONFIG.TRENDING.VIDEOS.INTERVAL_DAYS,
+          algorithms: {
+            enabled: CONFIG.TRENDING.VIDEOS.ALGORITHMS.ENABLED,
+            default: CONFIG.TRENDING.VIDEOS.ALGORITHMS.DEFAULT
+          }
+        }
+      },
+      tracker: {
+        enabled: CONFIG.TRACKER.ENABLED
+      },
+
+      followings: {
+        instance: {
+          autoFollowIndex: {
+            indexUrl: CONFIG.FOLLOWINGS.INSTANCE.AUTO_FOLLOW_INDEX.INDEX_URL
+          }
+        }
+      },
+
+      broadcastMessage: {
+        enabled: CONFIG.BROADCAST_MESSAGE.ENABLED,
+        message: CONFIG.BROADCAST_MESSAGE.MESSAGE,
+        level: CONFIG.BROADCAST_MESSAGE.LEVEL,
+        dismissable: CONFIG.BROADCAST_MESSAGE.DISMISSABLE
+      },
+
+      homepage: {
+        enabled: this.homepageEnabled
+      }
+    }
+  }
+
+  async getServerConfig (ip?: string): Promise<ServerConfig> {
+    const { allowed } = await Hooks.wrapPromiseFun(
+      isSignupAllowed,
+      {
+        ip
+      },
+      'filter:api.user.signup.allowed.result'
+    )
+
+    const allowedForCurrentIP = isSignupAllowedForCurrentIP(ip)
+
+    const signup = {
+      allowed,
+      allowedForCurrentIP,
+      requiresEmailVerification: CONFIG.SIGNUP.REQUIRES_EMAIL_VERIFICATION
+    }
+
+    const htmlConfig = await this.getHTMLServerConfig()
+
+    return { ...htmlConfig, signup }
+  }
+
+  getRegisteredThemes () {
+    return PluginManager.Instance.getRegisteredThemes()
+                        .map(t => ({
+                          name: t.name,
+                          version: t.version,
+                          description: t.description,
+                          css: t.css,
+                          clientScripts: t.clientScripts
+                        }))
+  }
+
+  getRegisteredPlugins () {
+    return PluginManager.Instance.getRegisteredPlugins()
+                        .map(p => ({
+                          name: p.name,
+                          version: p.version,
+                          description: p.description,
+                          clientScripts: p.clientScripts
+                        }))
+  }
+
+  getEnabledResolutions (type: 'vod' | 'live') {
+    const transcoding = type === 'vod'
+      ? CONFIG.TRANSCODING
+      : CONFIG.LIVE.TRANSCODING
+
+    return Object.keys(transcoding.RESOLUTIONS)
+                 .filter(key => transcoding.ENABLED && transcoding.RESOLUTIONS[key] === true)
+                 .map(r => parseInt(r, 10))
+  }
+
+  private getIdAndPassAuthPlugins () {
+    const result: RegisteredIdAndPassAuthConfig[] = []
+
+    for (const p of PluginManager.Instance.getIdAndPassAuths()) {
+      for (const auth of p.idAndPassAuths) {
+        result.push({
+          npmName: p.npmName,
+          name: p.name,
+          version: p.version,
+          authName: auth.authName,
+          weight: auth.getWeight()
+        })
+      }
+    }
+
+    return result
+  }
+
+  private getExternalAuthsPlugins () {
+    const result: RegisteredExternalAuthConfig[] = []
+
+    for (const p of PluginManager.Instance.getExternalAuths()) {
+      for (const auth of p.externalAuths) {
+        result.push({
+          npmName: p.npmName,
+          name: p.name,
+          version: p.version,
+          authName: auth.authName,
+          authDisplayName: auth.authDisplayName()
+        })
+      }
+    }
+
+    return result
+  }
+
+  static get Instance () {
+    return this.instance || (this.instance = new this())
+  }
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+  ServerConfigManager
+}