Add config helper for plugins

server/lib/plugins/plugin-helpers.ts

@@ -2,6 +2,7 @@ import { PeerTubeHelpers } from '@server/typings/plugins'
 import { sequelizeTypescript } from '@server/initializers/database'
 import { buildLogger } from '@server/helpers/logger'
 import { VideoModel } from '@server/models/video/video'
+import { WEBSERVER } from '@server/initializers/constants'
 
 function buildPluginHelpers (npmName: string): PeerTubeHelpers {
   const logger = buildPluginLogger(npmName)
@@ -9,10 +10,13 @@ function buildPluginHelpers (npmName: string): PeerTubeHelpers {
   const database = buildDatabaseHelpers()
   const videos = buildVideosHelpers()
 
+  const config = buildConfigHelpers()
+
   return {
     logger,
     database,
-    videos
+    videos,
+    config
   }
 }
 
@@ -43,3 +47,11 @@ function buildVideosHelpers () {
     }
   }
 }
+
+function buildConfigHelpers () {
+  return {
+    getWebserverUrl () {
+      return WEBSERVER.URL
+    }
+  }
+}