[AWS|Storage] signed_url should use v2 signature when aws_signature_version is 2

Gemfile

@@ -2,6 +2,5 @@ source 'https://rubygems.org'
 
 # Specify your gem's dependencies in fog-aws.gemspec
 gemspec
-
 gem 'pry-nav', group: :test
 gem "codeclimate-test-reporter", group: :test, require: nil

lib/fog/aws/storage.rb

@@ -141,9 +141,28 @@ module Fog
 
         def signed_url(params, expires)
           #convert expires from a point in time to a delta to now
+          expires = expires.to_i
+          if @signature_version == 4
+            params = v4_signed_params_for_url(params, expires)
+          else
+            params = v2_signed_params_for_url(params, expires)
+          end
+
+          params_to_url(params)
+        end
+
+        private
+
+        def validate_signature_version!
+          unless @signature_version == 2 || @signature_version == 4
+            raise "Unknown signature version #{@signature_version}; valid versions are 2 or 4"
+          end
+        end
+
+        def v4_signed_params_for_url(params, expires)
           now = Fog::Time.now
 
-          expires = expires.to_i - now.to_i
+          expires = expires - now.to_i
           params[:headers] ||= {}
 
           params[:query]||= {}
@@ -157,14 +176,29 @@ module Fog
           params = request_params(params)
           params[:headers][:host] = params[:host]
 
-          signature = @signer.signature_parameters(params, now, "UNSIGNED-PAYLOAD")
-
-          params[:query] = (params[:query] || {}).merge(signature)
-
-          params_to_url(params)
+          signature_query_params = @signer.signature_parameters(params, now, "UNSIGNED-PAYLOAD")
+          params[:query] = (params[:query] || {}).merge(signature_query_params)
+          params
         end
 
-        private
+        def v2_signed_params_for_url(params, expires)
+          if @aws_session_token
+            params[:headers]||= {}
+            params[:headers]['x-amz-security-token'] = @aws_session_token
+          end
+          signature = signature_v2(params, expires)
+
+          params = request_params(params)
+
+          signature_query_params = {
+            'AWSAccessKeyId' => @aws_access_key_id,
+            'Signature' => signature,
+            'Expires' => expires,
+          }
+          params[:query] = (params[:query] || {}).merge(signature_query_params)
+          params[:query]['x-amz-security-token'] = @aws_session_token if @aws_session_token
+          params
+        end
 
         def region_to_host(region=nil)
           case region.to_s
@@ -377,6 +411,8 @@ module Fog
             @port       = options[:port]        || DEFAULT_SCHEME_PORT[@scheme]
           end
           @path_style = options[:path_style] || false
+          @signature_version = options.fetch(:aws_signature_version, 4)
+          validate_signature_version!
           setup_credentials(options)
         end
 
@@ -396,6 +432,11 @@ module Fog
 
           @signer = Fog::AWS::SignatureV4.new( @aws_access_key_id, @aws_secret_access_key, @region, 's3')
         end
+
+        def signature_v2(params, expires)
+          'foo'
+        end
+
       end
 
       class Real
@@ -451,11 +492,6 @@ module Fog
 
         private
 
-        def validate_signature_version!
-          unless @signature_version == 2 || @signature_version == 4
-            raise "Unknown signature version #{@signature_version}; valid versions are 2 or 4"
-          end
-        end
 
         def setup_credentials(options)
           @aws_access_key_id     = options[:aws_access_key_id]

tests/models/storage/url_tests.rb

@@ -1,5 +1,4 @@
 # encoding: utf-8
-
 Shindo.tests('AWS | url', ["aws"]) do
 
 
@@ -14,11 +13,30 @@ Shindo.tests('AWS | url', ["aws"]) do
 
   now = Fog::Time.now
   if RUBY_VERSION > '1.8.7' # ruby 1.8.x doesn't provide hash ordering
-    tests('#url w/ response-cache-control').returns(
+    tests('#v4 url w/ response-cache-control').returns(
       "https://fognonbucket.s3.amazonaws.com/test.txt?response-cache-control=No-cache&X-Amz-Expires=500&X-Amz-Date=#{now.to_iso8601_basic}&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=123/#{now.utc.strftime('%Y%m%d')}/us-east-1/s3/aws4_request&X-Amz-SignedHeaders=host&X-Amz-Signature="
     ) do
 
-      @file.url(Time.now + 500, :query => { 'response-cache-control' => 'No-cache' }).gsub(/(X-Amz-Signature=)[0-9a-f]+\z/,'\\1')
+      @file.url(now + 500, :query => { 'response-cache-control' => 'No-cache' }).gsub(/(X-Amz-Signature=)[0-9a-f]+\z/,'\\1')
+    end
+  end
+
+  @storage = Fog::Storage.new(
+    :provider => 'AWS',
+    :aws_access_key_id => '123',
+    :aws_secret_access_key => 'abc',
+    :aws_signature_version => 2,
+    :region => 'us-east-1'
+  )
+
+  @file = @storage.directories.new(:key => 'fognonbucket').files.new(:key => 'test.txt')
+
+  if RUBY_VERSION > '1.8.7' # ruby 1.8.x doesn't provide hash ordering
+    tests('#v2 url w/ response-cache-control').returns(
+      "https://fognonbucket.s3.amazonaws.com/test.txt?response-cache-control=No-cache&AWSAccessKeyId=123&Signature=foo&Expires=#{now.to_i + 500}"
+    ) do
+
+      @file.url(now + 500, :query => { 'response-cache-control' => 'No-cache' })
     end
   end