class ActionMailer::InlinePreviewInterceptor


ActionMailer::Base.preview_interceptors.delete(ActionMailer::InlinePreviewInterceptor)
ActionMailer::Base.preview_interceptors array:
This interceptor is enabled by default. To disable it, delete it from the
when previewing an HTML email in a web browser.
that use inline cid: style URLs to data: style URLs so that they are visible
Implements a mailer preview interceptor that converts image tag src attributes
= Action Mailer InlinePreviewInterceptor

def self.previewing_email(message) # :nodoc:

:nodoc: 
def self.previewing_email(message) # :nodoc:
  new(message).transform!
end

def data_url(part) 

def data_url(part)
  "data:#{part.mime_type};base64,#{strict_encode64(part.body.raw_source)}"
end

def find_part(cid) 

def find_part(cid)
  message.all_parts.find { |p| p.attachment? && p.cid == cid }
end

def html_part 

def html_part
  @html_part ||= message.html_part
end

def initialize(message) # :nodoc:

:nodoc: 
def initialize(message) # :nodoc:
  @message = message
end

def transform! # :nodoc:

:nodoc: 
def transform! # :nodoc:
  return message if html_part.blank?
  html_part.body = html_part.decoded.gsub(PATTERN) do |match|
    if part = find_part(match[9..-2])
      %[src="#{data_url(part)}"]
    else
      match
    end
  end
  message
end