Add ability to generate trial license and upload it immediately

app/controllers/trials_controller.rb

 class TrialsController < ApplicationController
+  SUBSCRIPTIONS_PORTAL_URL = 'https://customers.gitlab.com'
+
+  before_filter :check_presence_of_license
+
   def new
   end
+
+  def create
+    build_license
+
+    if save_license
+      redirect_to admin_license_url
+    else
+      flash.now[:alert] = 'An error occurred while generating the trial license, please try again a few minutes'
+      render :new
+    end
+  end
+
+  private
+
+  def build_license
+    @license = License.new
+  end
+
+  def save_license
+    result = HTTParty.post("#{SUBSCRIPTIONS_PORTAL_URL}/trials", body: params)
+
+    if result.ok?
+      @license.data = result['license_key']
+      @license.save
+    else
+      Rails.logger.error("Error generating trial license: #{result['error']}")
+      @license.errors.add(:base, result['error'])
+    end
+
+    @license.persisted?
+  end
+
+  def check_presence_of_license
+    current_license = License.current
+
+    if current_license && !current_license.expired?
+      redirect_to admin_license_url
+    end
+  end
 end

app/views/trials/new.html.haml

 - page_title 'Trial license'
 %h3.page-title Trial License
+
 %main{ :role => "main" }
   .actions
-    = form_tag oauth_authorization_path, method: :post do
+    = form_tag trials_path, method: :post do
       .form-group
         = label_tag :first_name
-        = text_field_tag :first_name, nil, class: "form-control", required: true
+        = text_field_tag :first_name, params[:first_name], class: "form-control", required: true
       .form-group
         = label_tag :last_name
-        = text_field_tag :last_name, nil, class: "form-control", required: true
+        = text_field_tag :last_name, params[:last_name], class: "form-control", required: true
       .form-group
         = label_tag :work_email
-        = text_field_tag :work_email, nil, class: "form-control", required: true
+        = text_field_tag :work_email, params[:work_email], class: "form-control", required: true
       .form-group
         = label_tag :company_name
-        = text_field_tag :company_name, nil, class: "form-control", required: true
+        = text_field_tag :company_name, params[:company_name], class: "form-control", required: true
       .form-group
         = label_tag :phone_number
-        = text_field_tag :phone_number, nil, class: "form-control", required: true
+        = text_field_tag :phone_number, params[:phone_number], class: "form-control", required: true
       .form-group
         = label_tag :number_of_developers
-        = text_field_tag :number_of_developers, nil, class: "form-control", required: true
+        = text_field_tag :number_of_developers, params[:number_of_developers], class: "form-control", required: true
       .form-group
         = label_tag :number_of_users
-        = text_field_tag :number_of_users, nil, class: "form-control", required: true
+        = text_field_tag :number_of_users, params[:number_of_users], class: "form-control", required: true
       .form-group
         = label_tag :country
-        = text_field_tag :country, nil, class: "form-control", required: true
+        = text_field_tag :country, params[:country], class: "form-control", required: true
       .form-group
         = submit_tag 'Start your free trial', class: "btn btn-default"