Fix backend channel name validator consistency

server/helpers/custom-validators/video-channels.ts

@@ -1,14 +1,20 @@
 import validator from 'validator'
 import { CONSTRAINTS_FIELDS } from '../../initializers/constants'
 import { exists } from './misc'
+import { isUserUsernameValid } from './users'
 
 const VIDEO_CHANNELS_CONSTRAINTS_FIELDS = CONSTRAINTS_FIELDS.VIDEO_CHANNELS
 
+function isVideoChannelUsernameValid (value: string) {
+  // Use the same constraints than user username
+  return isUserUsernameValid(value)
+}
+
 function isVideoChannelDescriptionValid (value: string) {
   return value === null || validator.isLength(value, VIDEO_CHANNELS_CONSTRAINTS_FIELDS.DESCRIPTION)
 }
 
-function isVideoChannelNameValid (value: string) {
+function isVideoChannelDisplayNameValid (value: string) {
   return exists(value) && validator.isLength(value, VIDEO_CHANNELS_CONSTRAINTS_FIELDS.NAME)
 }
 
@@ -19,7 +25,8 @@ function isVideoChannelSupportValid (value: string) {
 // ---------------------------------------------------------------------------
 
 export {
+  isVideoChannelUsernameValid,
   isVideoChannelDescriptionValid,
-  isVideoChannelNameValid,
+  isVideoChannelDisplayNameValid,
   isVideoChannelSupportValid
 }