check awk connection before starting the setup

app/controllers/setup/single_site_controller.rb

@@ -5,6 +5,7 @@ class SingleSiteController < ApplicationController
     skip_before_action :run_first_time_setup
     before_action :ensure_single_site_install, only: [:index, :create]
     before_action :ensure_no_users, only: [:index, :create]
+    before_action :check_aws_credentials!, only: [:index, :create]
 
     def index
       @user = User.new
@@ -36,5 +37,14 @@ def ensure_single_site_install
     def ensure_no_users
       redirect_to root_url if current_team.users.count > 0
     end
+
+    def check_aws_credentials!
+      s3 = AWS::S3.new
+      bucket = s3.buckets[ENV.fetch('AWS_S3_BUCKET')]
+      s3.buckets.create(ENV.fetch('AWS_S3_BUCKET')) if !bucket.exists?
+
+    rescue StandardError
+      render :invalid_aws_credentials
+    end
   end
 end

app/views/setup/single_site/invalid_aws_credentials.html.erb

@@ -0,0 +1,16 @@
+<ul class="steps h-list">
+  <li class="step">
+    <span class="number">1</span> Your account
+  </li>
+  <li class="step">
+    <span class="number">2</span> First Project
+  </li>
+  <li class="step">
+    <span class="number">3</span> Invite your team
+  </li>
+</ul>
+
+<div class="page-container">
+  <h2>AWS Credentials Error</h2>
+  <p>We failed to connect to your s3 bucket. Please check your AWS credentials and try again.</p>
+</div>