completed SMS gateway project

app/controllers/api/v1/gateway/registrations_controller.rb

@@ -0,0 +1,53 @@
+module Api
+  module V1
+    module Gateway
+      class RegistrationsController < ApplicationController
+        skip_before_action :authenticate_api_key!, only: [:create]
+
+        def create
+          device_id = params.require(:device_id)
+          name = params[:name] || "Gateway #{device_id[0..7]}"
+
+          # Check if gateway already exists
+          gateway = ::Gateway.find_by(device_id: device_id)
+
+          if gateway
+            render json: {
+              success: false,
+              error: "Gateway already registered"
+            }, status: :conflict
+            return
+          end
+
+          # Create new gateway
+          gateway = ::Gateway.new(
+            device_id: device_id,
+            name: name,
+            status: "offline"
+          )
+
+          raw_key = gateway.generate_api_key!
+
+          render json: {
+            success: true,
+            api_key: raw_key,
+            device_id: gateway.device_id,
+            websocket_url: websocket_url
+          }, status: :created
+        rescue ActionController::ParameterMissing => e
+          render json: { error: e.message }, status: :bad_request
+        end
+
+        private
+
+        def websocket_url
+          if Rails.env.production?
+            "wss://#{request.host}/cable"
+          else
+            "ws://#{request.host}:#{request.port}/cable"
+          end
+        end
+      end
+    end
+  end
+end