Support per style options for s3 storage class

lib/paperclip/storage/s3.rb

@@ -102,6 +102,14 @@ module Paperclip
     #   Redundancy Storage.  RRS enables customers to reduce their
     #   costs by storing non-critical, reproducible data at lower
     #   levels of redundancy than Amazon S3's standard storage.
+    #
+    #   You can set storage class on a per style bases by doing the following:
+    #     :s3_storage_class => {
+    #       :thumb => :reduced_reduncancy
+    #     }
+    #   Or globally:
+    #     :s3_storage_class => :reduced_redundancy
+
     module S3
       def self.extended base
         begin
@@ -139,7 +147,7 @@ module Paperclip
           @s3_headers = {}
           merge_s3_headers(@options[:s3_headers], @s3_headers, @s3_metadata)
 
-          @s3_headers[:storage_class] = @options[:s3_storage_class] if @options[:s3_storage_class]
+          @s3_storage_class = set_storage_class(@options[:s3_storage_class])
 
           @s3_server_side_encryption = :aes256
           if @options[:s3_server_side_encryption].blank?
@@ -272,6 +280,11 @@ module Paperclip
         permissions.merge :default => (permissions[:default] || :public_read)
       end
 
+      def set_storage_class(storage_class)
+        storage_class = {:default => storage_class} unless storage_class.respond_to?(:merge)
+        storage_class
+      end
+
       def parse_credentials creds
         creds = creds.respond_to?('call') ? creds.call(self) : creds
         creds = find_credentials(creds).stringify_keys
@@ -295,6 +308,10 @@ module Paperclip
         s3_permissions
       end
 
+      def s3_storage_class(style = default_style)
+        @s3_storage_class[style] || @s3_storage_class[:default]
+      end
+
       def s3_protocol(style = default_style, with_colon = false)
         protocol = @s3_protocol
         protocol = protocol.call(style, self) if protocol.respond_to?(:call)
@@ -320,6 +337,11 @@ module Paperclip
               :content_type => file.content_type,
               :acl => acl
             }
+
+            # add storage class for this style if defined
+            storage_class = s3_storage_class(style)
+            write_options.merge!(:storage_class => storage_class) if storage_class
+
             if @s3_server_side_encryption
               write_options[:server_side_encryption] = @s3_server_side_encryption
             end

spec/paperclip/storage/s3_spec.rb

@@ -938,7 +938,8 @@ describe Paperclip::Storage::S3 do
     end
   end
 
-  context "An attachment with S3 storage and storage class set using the header name" do
+  context "An attachment with S3 storage and storage class set" do
+    context "using the header name" do
       before do
         rebuild_model storage: :s3,
           bucket: "testing",
@@ -977,6 +978,95 @@ describe Paperclip::Storage::S3 do
       end
     end
 
+    context "using per style hash" do
+      before do
+        rebuild_model :storage => :s3,
+          :bucket => "testing",
+          :path => ":attachment/:style/:basename.:extension",
+          :styles => {
+            :thumb => "80x80>"
+          },
+          :s3_credentials => {
+            'access_key_id' => "12345",
+            'secret_access_key' => "54321"
+          },
+          :s3_storage_class => {
+            :thumb => :reduced_redundancy
+          }
+      end
+
+      context "when assigned" do
+        before do
+          @file = File.new(fixture_file('5k.png'), 'rb')
+          @dummy = Dummy.new
+          @dummy.avatar = @file
+        end
+
+        after { @file.close }
+
+        context "and saved" do
+          before do
+            object = stub
+            [:thumb, :original].each do |style|
+              @dummy.avatar.stubs(:s3_object).with(style).returns(object)
+              expected_options = {:content_type => "image/png", :acl => :public_read}
+              expected_options.merge!(:storage_class => :reduced_redundancy) if style == :thumb
+              object.expects(:write).with(anything, expected_options)
+            end
+            @dummy.save
+          end
+
+          it "succeeds" do
+            assert true
+          end
+        end
+      end
+    end
+
+    context "using global hash option" do
+      before do
+        rebuild_model :storage => :s3,
+          :bucket => "testing",
+          :path => ":attachment/:style/:basename.:extension",
+          :styles => {
+            :thumb => "80x80>"
+          },
+          :s3_credentials => {
+            'access_key_id' => "12345",
+            'secret_access_key' => "54321"
+          },
+          :s3_storage_class => :reduced_redundancy
+      end
+
+      context "when assigned" do
+        before do
+          @file = File.new(fixture_file('5k.png'), 'rb')
+          @dummy = Dummy.new
+          @dummy.avatar = @file
+        end
+
+        after { @file.close }
+
+        context "and saved" do
+          before do
+            object = stub
+            [:thumb, :original].each do |style|
+              @dummy.avatar.stubs(:s3_object).with(style).returns(object)
+              object.expects(:write).with(anything, :content_type => "image/png",
+                                          :acl => :public_read,
+                                          :storage_class => :reduced_redundancy)
+            end
+            @dummy.save
+          end
+
+          it "succeeds" do
+            assert true
+          end
+        end
+      end
+    end
+  end
+
   context "Can disable AES256 encryption multiple ways" do
     [nil, false, ''].each do |tech|
       before do