Added ability to set arbitrary S3 headers. Included option to remove timestamp…

Added ability to set arbitrary S3 headers. Included option to remove timestamp form url method to improve cache control

lib/paperclip/attachment.rb

@@ -97,9 +97,10 @@ module Paperclip
     # and can point to an action in your app, if you need fine grained security.
     # This is not recommended if you don't need the security, however, for
     # performance reasons.
-    def url style = default_style
+	# set include_updated_timestamp to false if you want to stop the attachment update time appended to the url
+    def url style = default_style, include_updated_timestamp = true
       url = original_filename.nil? ? interpolate(@default_url, style) : interpolate(@url, style)
-      updated_at ? [url, updated_at].compact.join(url.include?("?") ? "&" : "?") : url
+      include_updated_timestamp && updated_at ? [url, updated_at].compact.join(url.include?("?") ? "&" : "?") : url
     end
 
     # Returns the path of the attachment as defined by the :path option. If the

lib/paperclip/storage.rb

@@ -91,6 +91,7 @@ module Paperclip
     # * +s3_protocol+: The protocol for the URLs generated to your S3 assets. Can be either 
     #   'http' or 'https'. Defaults to 'http' when your :s3_permissions are 'public-read' (the
     #   default), and 'https' when your :s3_permissions are anything else.
+    # * +s3_headers+: A hash of headers such as {'Expires' => 1.year.from_now.httpdate}
     # * +bucket+: This is the name of the S3 bucket that will store your files. Remember
     #   that the bucket must be unique across all of Amazon S3. If the bucket does not exist
     #   Paperclip will attempt to create it. The bucket name will not be interpolated.
@@ -113,6 +114,7 @@ module Paperclip
           @s3_options     = @options[:s3_options] || {}
           @s3_permissions = @options[:s3_permissions] || 'public-read'
           @s3_protocol    = @options[:s3_protocol] || (@s3_permissions == 'public-read' ? 'http' : 'https')
+		  @s3_headers     = @options[:s3_headers] || {}
           @url            = ":s3_path_url" unless @url.to_s.match(/^:s3.*url$/)
         end
         base.class.interpolations[:s3_path_url] = lambda do |attachment, style|
@@ -165,7 +167,7 @@ module Paperclip
             logger.info("[paperclip] -> #{path(style)}")
             key = s3_bucket.key(path(style))
             key.data = file
-            key.put(nil, @s3_permissions, {'Content-type' => instance_read(:content_type)})
+            key.put(nil, @s3_permissions, {'Content-type' => instance_read(:content_type)}.merge(@s3_headers))
           rescue RightAws::AwsError => e
             raise
           end

test/attachment_test.rb

@@ -296,6 +296,10 @@ class AttachmentTest < Test::Unit::TestCase
         assert_match %r{#{Time.now.to_i}$}, @attachment.url(:blah)
       end
  
+      should "make sure the updated_at mtime is NOT in the url if false is passed to the url method" do
+        assert_no_match %r{#{Time.now.to_i}$}, @attachment.url(:blah, false)
+      end
+
       context "with the updated_at field removed" do
         setup do
           @attachment.stubs(:instance_read).with(:updated_at).returns(nil)