2 files changed, 30 insertions, 0 deletions
diff --git a/lib/paperclip/attachment_extensions.rb b/lib/paperclip/attachment_extensions.rb
index 3b308af5f..d9ec0159a 100644
--- a/lib/paperclip/attachment_extensions.rb
+++ b/lib/paperclip/attachment_extensions.rb
@@ -24,6 +24,19 @@ module Paperclip
         flush_deletes
       end
     end
+
+    def variant?(other_filename)
+      return true  if original_filename == other_filename
+      return false if original_filename.nil?
+
+      formats = styles.values.map(&:format).compact
+
+      return false if formats.empty?
+
+      other_extension = File.extname(other_filename)
+
+      formats.include?(other_extension.delete('.')) && File.basename(other_filename, other_extension) == File.basename(original_filename, File.extname(original_filename))
+    end
   end
 end
 
diff --git a/lib/paperclip/url_generator_extensions.rb b/lib/paperclip/url_generator_extensions.rb
new file mode 100644
index 000000000..1079efdbc
--- /dev/null
+++ b/lib/paperclip/url_generator_extensions.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+module Paperclip
+  module UrlGeneratorExtensions
+    # Monkey-patch Paperclip to use Addressable::URI's normalization instead
+    # of the long-deprecated URI.esacpe
+    def escape_url(url)
+      if url.respond_to?(:escape)
+        url.escape
+      else
+        Addressable::URI.parse(url).normalize.to_str.gsub(escape_regex) { |m| "%#{m.ord.to_s(16).upcase}" }
+      end
+    end
+  end
+end
+
+Paperclip::UrlGenerator.prepend(Paperclip::UrlGeneratorExtensions)