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, 53 insertions, 9 deletions

diff --git a/server/controllers/api/config.ts b/server/controllers/api/config.ts
index 5ce7adc35..c9b5c8047 100644
--- a/server/controllers/api/config.ts
+++ b/server/controllers/api/config.ts
@@ -1,8 +1,8 @@
+import { ServerConfigManager } from '@server/lib/server-config-manager'
 import * as express from 'express'
 import { remove, writeJSON } from 'fs-extra'
 import { snakeCase } from 'lodash'
 import validator from 'validator'
-import { getServerConfig } from '@server/lib/config'
 import { UserRight } from '../../../shared'
 import { About } from '../../../shared/models/server/about.model'
 import { CustomConfig } from '../../../shared/models/server/custom-config.model'
@@ -43,7 +43,7 @@ configRouter.delete('/custom',
 )
 
 async function getConfig (req: express.Request, res: express.Response) {
-  const json = await getServerConfig(req.ip)
+  const json = await ServerConfigManager.Instance.getServerConfig(req.ip)
 
   return res.json(json)
 }
diff --git a/server/controllers/api/custom-page.ts b/server/controllers/api/custom-page.ts
new file mode 100644
index 000000000..3c47f7b9a
--- /dev/null
+++ b/server/controllers/api/custom-page.ts
@@ -0,0 +1,42 @@
+import * as express from 'express'
+import { ServerConfigManager } from '@server/lib/server-config-manager'
+import { ActorCustomPageModel } from '@server/models/account/actor-custom-page'
+import { HttpStatusCode } from '@shared/core-utils'
+import { UserRight } from '@shared/models'
+import { asyncMiddleware, authenticate, ensureUserHasRight } from '../../middlewares'
+
+const customPageRouter = express.Router()
+
+customPageRouter.get('/homepage/instance',
+  asyncMiddleware(getInstanceHomepage)
+)
+
+customPageRouter.put('/homepage/instance',
+  authenticate,
+  ensureUserHasRight(UserRight.MANAGE_INSTANCE_CUSTOM_PAGE),
+  asyncMiddleware(updateInstanceHomepage)
+)
+
+// ---------------------------------------------------------------------------
+
+export {
+  customPageRouter
+}
+
+// ---------------------------------------------------------------------------
+
+async function getInstanceHomepage (req: express.Request, res: express.Response) {
+  const page = await ActorCustomPageModel.loadInstanceHomepage()
+  if (!page) return res.sendStatus(HttpStatusCode.NOT_FOUND_404)
+
+  return res.json(page.toFormattedJSON())
+}
+
+async function updateInstanceHomepage (req: express.Request, res: express.Response) {
+  const content = req.body.content
+
+  await ActorCustomPageModel.updateInstanceHomepage(content)
+  ServerConfigManager.Instance.updateHomepageState(content)
+
+  return res.sendStatus(HttpStatusCode.NO_CONTENT_204)
+}
diff --git a/server/controllers/api/index.ts b/server/controllers/api/index.ts
index 7ade1df3a..28378654a 100644
--- a/server/controllers/api/index.ts
+++ b/server/controllers/api/index.ts
@@ -8,6 +8,7 @@ import { abuseRouter } from './abuse'
 import { accountsRouter } from './accounts'
 import { bulkRouter } from './bulk'
 import { configRouter } from './config'
+import { customPageRouter } from './custom-page'
 import { jobsRouter } from './jobs'
 import { oauthClientsRouter } from './oauth-clients'
 import { overviewsRouter } from './overviews'
@@ -47,6 +48,7 @@ apiRouter.use('/jobs', jobsRouter)
 apiRouter.use('/search', searchRouter)
 apiRouter.use('/overviews', overviewsRouter)
 apiRouter.use('/plugins', pluginRouter)
+apiRouter.use('/custom-pages', customPageRouter)
 apiRouter.use('/ping', pong)
 apiRouter.use('/*', badRequest)
 
diff --git a/server/controllers/api/videos/import.ts b/server/controllers/api/videos/import.ts
index ee63c7b77..0d5d7a962 100644
--- a/server/controllers/api/videos/import.ts
+++ b/server/controllers/api/videos/import.ts
@@ -3,7 +3,7 @@ import { move, readFile } from 'fs-extra'
 import * as magnetUtil from 'magnet-uri'
 import * as parseTorrent from 'parse-torrent'
 import { join } from 'path'
-import { getEnabledResolutions } from '@server/lib/config'
+import { ServerConfigManager } from '@server/lib/server-config-manager'
 import { setVideoTags } from '@server/lib/video'
 import { FilteredModelAttributes } from '@server/types'
 import {
@@ -134,7 +134,7 @@ async function addYoutubeDLImport (req: express.Request, res: express.Response)
   const targetUrl = body.targetUrl
   const user = res.locals.oauth.token.User
 
-  const youtubeDL = new YoutubeDL(targetUrl, getEnabledResolutions('vod'))
+  const youtubeDL = new YoutubeDL(targetUrl, ServerConfigManager.Instance.getEnabledResolutions('vod'))
 
   // Get video infos
   let youtubeDLInfo: YoutubeDLInfo
diff --git a/server/controllers/static.ts b/server/controllers/static.ts
index 8a747ec52..3870ebfe9 100644
--- a/server/controllers/static.ts
+++ b/server/controllers/static.ts
@@ -2,7 +2,7 @@ import * as cors from 'cors'
 import * as express from 'express'
 import { join } from 'path'
 import { serveIndexHTML } from '@server/lib/client-html'
-import { getEnabledResolutions, getRegisteredPlugins, getRegisteredThemes } from '@server/lib/config'
+import { ServerConfigManager } from '@server/lib/server-config-manager'
 import { HttpStatusCode } from '@shared/core-utils/miscs/http-error-codes'
 import { HttpNodeinfoDiasporaSoftwareNsSchema20 } from '../../shared/models/nodeinfo/nodeinfo.model'
 import { root } from '../helpers/core-utils'
@@ -203,10 +203,10 @@ async function generateNodeinfo (req: express.Request, res: express.Response) {
             }
           },
           plugin: {
-            registered: getRegisteredPlugins()
+            registered: ServerConfigManager.Instance.getRegisteredPlugins()
           },
           theme: {
-            registered: getRegisteredThemes(),
+            registered: ServerConfigManager.Instance.getRegisteredThemes(),
             default: getThemeOrDefault(CONFIG.THEME.DEFAULT, DEFAULT_THEME_NAME)
           },
           email: {
@@ -222,13 +222,13 @@ async function generateNodeinfo (req: express.Request, res: express.Response) {
             webtorrent: {
               enabled: CONFIG.TRANSCODING.WEBTORRENT.ENABLED
             },
-            enabledResolutions: getEnabledResolutions('vod')
+            enabledResolutions: ServerConfigManager.Instance.getEnabledResolutions('vod')
           },
           live: {
             enabled: CONFIG.LIVE.ENABLED,
             transcoding: {
               enabled: CONFIG.LIVE.TRANSCODING.ENABLED,
-              enabledResolutions: getEnabledResolutions('live')
+              enabledResolutions: ServerConfigManager.Instance.getEnabledResolutions('live')
             }
           },
           import: {