precompute schemes map before any loop

Author: keithamus

lib/secure_headers/headers/content_security_policy.rb

@@ -155,9 +155,10 @@ def dedup_source_list(sources)
       wild_sources = sources.select { |source| source =~ STAR_REGEXP }
 
       if wild_sources.any?
+        schemes = sources.map { |source| [source, URI(source).scheme] }.to_h
         sources.reject do |source|
           !wild_sources.include?(source) &&
-            wild_sources.any? { |pattern| URI(pattern).scheme == URI(source).scheme && File.fnmatch(pattern, source) }
+            wild_sources.any? { |pattern| schemes[pattern] == schemes[source] && File.fnmatch(pattern, source) }
         end
       else
         sources