Translate bad filename characters

lib/paperclip/io_adapters/abstract_adapter.rb

@@ -2,6 +2,8 @@ require 'active_support/core_ext/module/delegation'
 
 module Paperclip
   class AbstractAdapter
+    OS_RESTRICTED_CHARACTERS = %r{[/:]}
+
     attr_reader :content_type, :original_filename, :size
     delegate :close, :closed?, :eof?, :path, :rewind, :unlink, :to => :@tempfile
 
@@ -17,6 +19,10 @@ module Paperclip
       "#{self.class}: #{self.original_filename}"
     end
 
+    def original_filename=(new_filename)
+      @original_filename = new_filename.gsub(OS_RESTRICTED_CHARACTERS, "_")
+    end
+
     private
 
     def destination

lib/paperclip/io_adapters/stringio_adapter.rb

@@ -6,7 +6,8 @@ module Paperclip
       @tempfile = copy_to_tempfile(@target)
     end
 
-    attr_writer :original_filename, :content_type
+    attr_writer :content_type
+
     private
 
     def cache_current_values

lib/paperclip/io_adapters/uri_adapter.rb

@@ -9,7 +9,8 @@ module Paperclip
       @tempfile = copy_to_tempfile(@content)
     end
 
-    attr_writer :original_filename, :content_type
+    attr_writer :content_type
+
     private
 
     def download_content

test/helper.rb

@@ -14,6 +14,7 @@ require 'active_support/core_ext'
 require 'mime/types'
 require 'pathname'
 require 'ostruct'
+require 'pry'
 
 puts "Testing against version #{ActiveRecord::VERSION::STRING}"
 

test/io_adapters/abstract_adapter_test.rb

@@ -2,7 +2,7 @@ require './test/helper'
 
 class AbstractAdapterTest < Test::Unit::TestCase
   class TestAdapter < Paperclip::AbstractAdapter
-    attr_accessor :original_file_name, :tempfile
+    attr_accessor :tempfile
 
     def content_type
       Paperclip::ContentTypeDetector.new(path).detect
@@ -40,4 +40,11 @@ class AbstractAdapterTest < Test::Unit::TestCase
       end
     end
   end
+
+  should 'get rid of slashes and colons in filenames' do
+    @adapter = TestAdapter.new
+    @adapter.original_filename = "awesome/file:name.png"
+
+    assert_equal "awesome_file_name.png", @adapter.original_filename
+  end
 end