Percent-encode unsafe characters in a filename when composing each URL.

app/models/agents/ftpsite_agent.rb

@@ -174,8 +174,8 @@ module Agents
       new_files.sort_by { |filename|
         found_entries[filename]
       }.each { |filename|
-        create_event :payload => {
-          'url' => "#{base_uri}#{filename}",
+        create_event payload: {
+          'url' => (base_uri + uri_path_escape(filename)).to_s,
           'filename' => filename,
           'timestamp' => found_entries[filename],
         }
@@ -192,5 +192,13 @@ module Agents
     rescue
       false
     end
+
+    def uri_path_escape(string)
+      str = string.dup.force_encoding(Encoding::ASCII_8BIT)  # string.b in Ruby >=2.0
+      str.gsub!(/([^A-Za-z0-9\-._~!$&()*+,=@]+)/) { |m|
+        '%' + m.unpack('H2' * m.bytesize).join('%').upcase
+      }
+      str.force_encoding(Encoding::US_ASCII)
+    end
   end
 end

spec/models/agents/ftpsite_agent_spec.rb

@@ -76,6 +76,12 @@ describe Agents::FtpsiteAgent do
           'timestamp' => '2014-04-02T10:00:00Z',
         }
 
+        Event.last.payload.should == {
+          'url' => 'ftp://ftp.example.org/pub/releases/example%20latest.tar.gz',
+          'filename' => 'example latest.tar.gz',
+          'timestamp' => '2014-04-02T10:00:01Z',
+        }
+
         lambda { @checker.check }.should_not change { Event.count }
       end
     end