Add /connect route

app/controllers/messages_controller.rb

@@ -1,10 +1,10 @@
 class MessagesController < ApplicationController
   include CompletionsConcern
 
-  skip_before_action :verify_authenticity_token, only: %i[ create cors_preflight_check ]
+  skip_before_action :verify_authenticity_token, only: %i[ create connect cors_preflight_check ]
-  skip_before_action :require_authentication, only: %i[ create cors_preflight_check ]
+  skip_before_action :require_authentication, only: %i[ create connect cors_preflight_check ]
 
-  before_action :cors_set_access_control_headers, only: %i[ create cors_preflight_check ]
+  before_action :cors_set_access_control_headers, only: %i[ create connect cors_preflight_check ]
   before_action :set_contest, only: %i[ convert destroy ]
   before_action :set_data, only: %i[ convert ]
 
@@ -24,6 +24,27 @@ class MessagesController < ApplicationController
     skip_authorization
   end
 
+  def connect
+    skip_authorization
+
+    if !params.key?(:token)
+      respond_to do |format|
+        format.json  { render json: { error: "no token provided" }, status: 400 }
+      end
+    else
+      @contest = Contest.find_by_token_for(:token, params[:token])
+      if @contest
+        respond_to do |format|
+          format.json  { render json: { name: @contest.name }, status: 200 }
+        end
+      else
+        respond_to do |format|
+          format.json  { render json: { error: "invalid token" }, status: 400 }
+        end
+      end
+    end
+  end
+
   def create
     skip_authorization
 
@@ -37,12 +58,12 @@ class MessagesController < ApplicationController
         end
       else
         respond_to do |format|
-          format.json  { render json: { error: "invalid contest token" }, status: 400 }
+          format.json  { render json: { error: "invalid token" }, status: 400 }
         end
       end
     rescue
       respond_to do |format|
-        format.json  { render json: { error: "invalid contest token" }, status: 400 }
+        format.json  { render json: { error: "invalid token" }, status: 400 }
       end
     end
   end

config/routes.rb

@@ -24,7 +24,9 @@ Rails.application.routes.draw do
   resource :session
   resources :users
 
+  options "connect", to: "messages#cors_preflight_check"
   options "message", to: "messages#cors_preflight_check"
+  post "connect", to: "messages#connect"
   post "message", to: "messages#create"
 
   get "public/:id", to: "contests#scoreboard"