Remove code duplication in JwtController

app/controllers/jwt_controller.rb

@@ -42,46 +42,8 @@ class JwtController < ApplicationController
   end
 
   def authenticate_user(login, password)
-    # TODO: this is a copy and paste from grack_auth,
-    # it should be refactored in the future
-
     user = Gitlab::Auth.find_in_gitlab_or_ldap(login, password)
-
-    # If the user authenticated successfully, we reset the auth failure count
-    # from Rack::Attack for that IP. A client may attempt to authenticate
-    # with a username and blank password first, and only after it receives
-    # a 401 error does it present a password. Resetting the count prevents
-    # false positives from occurring.
-    #
-    # Otherwise, we let Rack::Attack know there was a failed authentication
-    # attempt from this IP. This information is stored in the Rails cache
-    # (Redis) and will be used by the Rack::Attack middleware to decide
-    # whether to block requests from this IP.
-    config = Gitlab.config.rack_attack.git_basic_auth
-
-    if config.enabled
-      if user
-        # A successful login will reset the auth failure count from this IP
-        Rack::Attack::Allow2Ban.reset(request.ip, config)
-      else
-        banned = Rack::Attack::Allow2Ban.filter(request.ip, config) do
-          # Unless the IP is whitelisted, return true so that Allow2Ban
-          # increments the counter (stored in Rails.cache) for the IP
-          if config.ip_whitelist.include?(request.ip)
-            false
-          else
-            true
-          end
-        end
-
-        if banned
-          Rails.logger.info "IP #{request.ip} failed to login " \
-              "as #{login} but has been temporarily banned from Git auth"
-          return
-        end
-      end
-    end
-
+    Gitlab::Auth.rate_limit!(request.ip, success: user.present?, login: login)
     user
   end
 end