spree-contrib/spree_email_to_friend

class Spree::MailToFriend
  include ActiveModel::Validations
  include ActiveModel::Conversion
  attr_accessor :host, :subject, :sender_name, :sender_email, :recipient_name, :recipient_email, :message, :recipients, :invalid_recipients

  EMAILREGEX = /\A[-a-z0-9_+\.]+\@([-a-z0-9]+\.)+[a-z0-9]{2,8}\z/i

  validates :subject, :sender_name, presence: true
  validates :recipient_name, presence: true, unless: :is_multi
  validates :sender_email, format: { with: EMAILREGEX }
  validates :recipients, length: { minimum: 1, message: Spree.t(:recipients, scope: :validation) }
  validates :invalid_recipients, length: { maximum: 0, message: Spree.t(:invalid_recipients, scope: :validation) }

  def initialize(opts = {})
    @sender_email = opts[:sender_email] || ''
    @sender_name  = opts[:sender_name]  || (@sender_email.split('@', 2)[0] || '').titleize
    @subject      = opts[:subject]      || Spree.t(:sender_subject, scope: :email_to_friend, sender_name: @sender_name, site: site_url)

    @recipients = []
    @invalid_recipients = []

    addresses = (opts[:recipient_email] || '').tr(';', ',').gsub(/\s/, '')
    addresses.split(',').each do |address|
      if address =~ EMAILREGEX
        @recipients << address
      else
        @invalid_recipients << address
      end
    end

    @recipient_name = opts[:recipient_name]
    @recipient_name ||= @recipients[0].split('@', 2)[0].titleize unless @recipients.empty?

    @message = opts[:message]
  end

  def persisted?
    false
  end

  def is_multi
    [@recipients, @invalid_recipients].compact.sum.size > 1
  end

  private

  def site_url
    Spree::Store.current.try(:url)
  end
end