local_paperclip_tempfile.rb

require 'digest/sha1'
require 'tempfile'
 
class LocalPaperclipTempfile < ::Tempfile
 
  # note: had a ton of trouble using "data" instead of "tmp_data" for naming here:
  def initialize(filename, tmp_data, tmpdir = Dir::tmpdir)
    @original_filename  = filename
    @tmp_data = tmp_data
    super Digest::SHA1.hexdigest(@tmp_data), tmpdir
    scribe
  end
 
  def scribe
    self.sync = true
    self.binmode
    self.write @tmp_data
    self.rewind
    self
  end
 
  def original_filename
    @original_filename
  end
 
  def content_type
    begin
      mime = `file --mime -br #{self.path}`.strip
      mime = mime.gsub(/^.*: */,"")
      mime = mime.gsub(/;.*$/,"")
      mime = mime.gsub(/,.*$/,"")
    rescue
      mime = "image/png" # don't really like the dependency on the 'file' command...
    end
    mime
  end
end