Honor the configured scheme for fog expiring URLs. In order to be

consistent with public URLs, this also changes the default behavior
for expiring URLs to use the https scheme rather than http.

lib/paperclip/storage/fog.rb

@@ -141,8 +141,9 @@ module Paperclip
 
       def expiring_url(time = (Time.now + 3600), style_name = default_style)
         time = convert_time(time)
-        if path(style_name) && directory.files.respond_to?(:get_http_url)
-          expiring_url = directory.files.get_http_url(path(style_name), time)
+        http_url_method = "get_#{scheme}_url"
+        if path(style_name) && directory.files.respond_to?(http_url_method)
+          expiring_url = directory.files.public_send(http_url_method, path(style_name), time)
 
           if @options[:fog_host]
             expiring_url.gsub!(/#{host_name_for_directory}/, dynamic_fog_host_for_style(style_name))

spec/paperclip/storage/fog_spec.rb

@@ -320,6 +320,9 @@ describe Paperclip::Storage::Fog do
         it "honors the scheme in public url" do
           assert_match(/^http:\/\//, @dummy.avatar.url)
         end
+        it "honors the scheme in expiring url" do
+          assert_match(/^http:\/\//, @dummy.avatar.expiring_url)
+        end
       end
 
       context "with scheme not set" do
@@ -334,6 +337,9 @@ describe Paperclip::Storage::Fog do
         it "provides HTTPS public url" do
           assert_match(/^https:\/\//, @dummy.avatar.url)
         end
+        it "provides HTTPS expiring url" do
+          assert_match(/^https:\/\//, @dummy.avatar.expiring_url)
+        end
       end
 
       context "with a valid bucket name for a subdomain" do
@@ -344,7 +350,7 @@ describe Paperclip::Storage::Fog do
         end
 
         it "provides an url that expires in subdomain style" do
-          assert_match(/^http:\/\/papercliptests.s3.amazonaws.com\/avatars\/5k.png.+Expires=.+$/, @dummy.avatar.expiring_url)
+          assert_match(/^https:\/\/papercliptests.s3.amazonaws.com\/avatars\/5k.png.+Expires=.+$/, @dummy.avatar.expiring_url)
         end
       end
 
@@ -392,7 +398,7 @@ describe Paperclip::Storage::Fog do
         end
 
         it "provides a url that expires in folder style" do
-          assert_match(/^http:\/\/s3.amazonaws.com\/this_is_invalid\/avatars\/5k.png.+Expires=.+$/, @dummy.avatar.expiring_url)
+          assert_match(/^https:\/\/s3.amazonaws.com\/this_is_invalid\/avatars\/5k.png.+Expires=.+$/, @dummy.avatar.expiring_url)
         end
 
       end