Devise custom mailer layout with inline attachments

confirmation_instructions.html.haml

-# app/views/devise_custom_mailer/confirmation_instructions.html.haml

%p
  = t('devise.mailer.welcome', :email => @resource.email)
%p= t('devise.mailer.confirmation_instructions.msg')
%p= link_to t('devise.mailer.confirmation_instructions.link'), confirmation_url(@resource, :confirmation_token => @resource.confirmation_token)
%br
- if @resource.tmp
  %p
    = t('devise.mailer.confirmation_instructions.password_instruction', :password => @resource.tmp)
    = t('devise.mailer.confirmation_instructions.password_instruction2')

devise.rb

# config/initializers/devise.rb

...
Devise.setup do |config|
  ...
  # Configure the class responsible to send e-mails.
  # config.mailer = "Devise::Mailer"
  config.mailer = "DeviseCustomMailer"

  ...
end

devise_custom_mailer.rb

# app/mailers/devise_custom_mailer.rb
class DeviseCustomMailer < Devise::Mailer
  if self.included_modules.include?(AbstractController::Callbacks)
    raise "You've already included AbstractController::Callbacks, remove this line."
  else
    include AbstractController::Callbacks
  end

  before_filter :add_inline_attachment!

  def confirmation_instructions(record)
    super
  end

  def reset_password_instructions(record)
    super
  end

  def unlock_instructions(record)
    super
  end

  private
  def add_inline_attachment!
    attachments.inline['header.jpg'] = File.read(File.join(Rails.root,'app','assets','images','mail','home.jpg'))
    attachments.inline['footer.jpg'] = File.read(File.join(Rails.root,'app','assets','images','mail','foot.jpg'))
  end
end

notifier.html.haml

-# app/views/layouts/notifier.html.haml

.header-mail{:style => "background-color:#fefefe;display:inline;float:left;font:normal 11px verdana;margin:0px;padding:10px;width:579px", :align => :center}
  = image_tag(attachments['header.jpg'].try(:url), :alt => "header", :height => "105px", :width => "361px")
  %br
.body-mail{:style => "background-color:#efefef;display:inline;float:left;font:normal 11px verdana;margin:0px;padding:10px;width:579px"}
  = yield
  %p{:style => "margin-top:30px"}
    %i L'équipe XXXXX
  %p
    PS : merci de ne pas répondre directement à cet e-mail, envoyé automatiquement
    %br
.footer-mail
  = image_tag(attachments['footer.jpg'].try(:url), :alt => "footer")

reset_password_instructions.html.haml

-# app/views/devise_custom_mailer/reset_password_instructions.html.haml

%p
  Hello #{@resource.email}!
%p Someone has requested a link to change your password, and you can do this through the link below.
%p= link_to 'Change my password', edit_password_url(@resource, :reset_password_token => @resource.reset_password_token)
%p If you didn't request this, please ignore this email.
%p Your password won't change until you access the link above and create a new one.

unlock_instructions.html.haml

-# app/views/devise_custom_mailer/unlock_instructions.html.haml

%p
  Hello #{@resource.email}!
%p Your account has been locked due to an excessive amount of unsuccessful sign in attempts.
%p Click the link below to unlock your account:
%p= link_to 'Unlock my account', unlock_url(@resource, :unlock_token => @resource.unlock_token)