Verify telegram bot credentials

app/controllers/telegram_bot_updates_controller.rb

@@ -1,10 +1,31 @@
 # frozen_string_literal: true
 
 class TelegramBotUpdatesController < ApplicationController
+  before_action :set_telegram_bot
+  before_action :verify_telegram_bot_secret
+
+  rescue_from ActiveRecord::RecordNotFound, with: :not_found
+
   # POST /telegram_bot_updates
   def create
     logger.info params.inspect
 
     render status: :no_content, json: {}
   end
+
+private
+
+  def set_telegram_bot
+    @telegram_bot = TelegramBot.find params[:telegram_bot_id]
+  end
+
+  def verify_telegram_bot_secret
+    return if params[:secret] == @telegram_bot.secret
+
+    render status: :unauthorized, json: {}
+  end
+
+  def not_found
+    render status: :not_found, json: {}
+  end
 end

spec/requests/telegram_bot_updates/create_spec.rb

@@ -3,11 +3,41 @@
 require 'rails_helper'
 
 RSpec.describe 'POST /telegram_bot_updates' do
-  before do
-    post '/telegram_bot_updates'
+  let(:telegram_bot) { create :telegram_bot }
+
+  context 'with valid params' do
+    before do
+      post '/telegram_bot_updates',
+           params: { telegram_bot_id: telegram_bot.id,
+                     secret:          telegram_bot.secret }
+    end
+
+    specify do
+      expect(response).to have_http_status :no_content
+    end
   end
 
-  specify do
-    expect(response).to have_http_status :no_content
+  context 'when no telegram bot exist' do
+    before do
+      post '/telegram_bot_updates',
+           params: { telegram_bot_id: rand(10_000..1_000_000),
+                     secret:          telegram_bot.secret }
+    end
+
+    specify do
+      expect(response).to have_http_status :not_found
+    end
+  end
+
+  context 'when secret is not valid' do
+    before do
+      post '/telegram_bot_updates',
+           params: { telegram_bot_id: telegram_bot.id,
+                     secret:          SecureRandom.hex }
+    end
+
+    specify do
+      expect(response).to have_http_status :unauthorized
+    end
   end
 end