Sinatra でメール送信フォーム

mailer.rb

# -*- coding: utf-8 -*-

require 'sinatra/base'
require 'haml'
require 'padrino-helpers'
require 'padrino-mailer'

class Mailer < Sinatra::Base
  register Padrino::Helpers
  register Padrino::Mailer
  enable :inline_templates
  set :haml, format: :html5
  set :delivery_method, :smtp => { 
    address:              'smtp.gmail.com',
    port:                 587,
    user_name:            '<username>@gmail.com',
    password:             '<password>',
    authentication:       :plain,
    enable_starttls_auto: true  
  }

  get '/' do
    haml :index
  end

  post '/send' do
    email({
      to: '<username>@gmail.com',
      from: params[:from],
      subject: params[:subject],
      body: params[:body],
    })
    'Sent mail!'
  end
end

__END__
@@layout
!!!
%title Mail
%meta{charset: 'utf-8'}
%body
  %header
    %h1 Mail
  %section
    = yield

@@index
- form_tag :send do
  %p from:
  %p= text_field_tag :from
  %p subject:
  %p= text_field_tag :subject
  %p body:
  %p= text_area_tag :body
  %p= submit_tag