# File lib/rack/protection/path_traversal.rb, line 21 def cleanup(path) parts = [] unescaped = path.gsub('%2e', '.').gsub('%2f', '/') unescaped.split('/').each do |part| next if part.empty? or part == '.' part == '..' ? parts.pop : parts << part end cleaned = '/' << parts.join('/') cleaned << '/' if parts.any? and unescaped =~ /\/\.{0,2}$/ cleaned end