feature: IP filtering on signup page

disable registration form on IP not in range
checking the CIDR list before filtering with it
placing the cidr filters as an attribute object in the config

server/controllers/api/config.ts

@@ -4,7 +4,7 @@ import { ServerConfig, UserRight } from '../../../shared'
 import { About } from '../../../shared/models/server/about.model'
 import { CustomConfig } from '../../../shared/models/server/custom-config.model'
 import { unlinkPromise, writeFilePromise } from '../../helpers/core-utils'
-import { isSignupAllowed } from '../../helpers/utils'
+import { isSignupAllowed, isSignupAllowedForCurrentIP } from '../../helpers/utils'
 import { CONFIG, CONSTRAINTS_FIELDS, reloadConfig } from '../../initializers'
 import { asyncMiddleware, authenticate, ensureUserHasRight } from '../../middlewares'
 import { customConfigUpdateValidator } from '../../middlewares/validators/config'
@@ -36,6 +36,7 @@ configRouter.delete('/custom',
 
 async function getConfig (req: express.Request, res: express.Response, next: express.NextFunction) {
   const allowed = await isSignupAllowed()
+  const allowedForCurrentIP = isSignupAllowedForCurrentIP(req.ip)
 
   const enabledResolutions = Object.keys(CONFIG.TRANSCODING.RESOLUTIONS)
    .filter(key => CONFIG.TRANSCODING.RESOLUTIONS[key] === true)
@@ -54,7 +55,8 @@ async function getConfig (req: express.Request, res: express.Response, next: exp
     },
     serverVersion: packageJSON.version,
     signup: {
-      allowed
+      allowed,
+      allowedForCurrentIP
     },
     transcoding: {
       enabledResolutions

server/controllers/api/users.ts

@@ -19,6 +19,7 @@ import {
   authenticate,
   ensureUserHasRight,
   ensureUserRegistrationAllowed,
+  ensureUserRegistrationAllowedForIP,
   paginationValidator,
   setDefaultPagination,
   setDefaultSort,
@@ -106,6 +107,7 @@ usersRouter.post('/',
 
 usersRouter.post('/register',
   asyncMiddleware(ensureUserRegistrationAllowed),
+  ensureUserRegistrationAllowedForIP,
   asyncMiddleware(usersRegisterValidator),
   asyncMiddleware(registerUserRetryWrapper)
 )