gistfile1.rb

module OpenIDConnect
  module Discovery
    class URINormalizer
      attr_accessor :input

      def initialize(input)
        self.input = input
      end

      def normalized
        normalized = case
        when has_scheme?
          input
        when acct_scheme_assumed?
          "acct:#{input}"
        else
          "https://#{input}"
        end
        normalized.split('#').first # strip fragment
      end

      def has_scheme?
        if input.include?("://")
          true
        else
          before_path = input.split(/[\/\?#]/).first
          if before_path.include?(':')
            scheme_or_host, host_or_port = before_path.split(':')
            host_or_port !~ /^\d+$/
          else
            false
          end
        end
      end

      def acct_scheme_assumed?
        if input.include?('@')
          host = input.split('@').last
          !(
            host.include?(':') ||
            host.include?('/') ||
            host.include?('?')
          ) # allowing fragment here?
        else
          false
        end
      end
    end
  end
end

[
  'example.com',
  'example.com:8080',
  'example.com/path',
  'example.com?query',
  'example.com#fragment',
  'example.com:8080/path?query#fragment',
  'http://example.com',
  'http://example.com:8080',
  'http://example.com/path',
  'http://example.com?query',
  'http://example.com#fragment',
  'http://example.com:8080/path?query#fragment',
  'nov@example.com',
  'nov@example.com:8080',
  'nov@example.com/path',
  'nov@example.com?query',
  'nov@example.com#fragment',
  'nov@example.com:8080/path?query#fragment',
  'acct:nov@matake.jp',
  'acct:nov@example.com:8080',
  'acct:nov@example.com/path',
  'acct:nov@example.com?query',
  'acct:nov@example.com#fragment',
  'acct:nov@example.com:8080/path?query#fragment',
  'mailto:nov@matake.jp',
  'mailto:nov@example.com:8080',
  'mailto:nov@example.com/path',
  'mailto:nov@example.com?query',
  'mailto:nov@example.com#fragment',
  'mailto:nov@example.com:8080/path?query#fragment',
  'localhost',
  'localhost:8080',
  'localhost/path',
  'localhost?query',
  'localhost#fragment',
  'localhost/path?query#fragment',
  'nov@localhost',
  'nov@localhost:8080',
  'nov@localhost/path',
  'nov@localhost?query',
  'nov@localhost#fragment',
  'nov@localhost/path?query#fragment',
  'tel:+810312345678',
  'device:192.168.2.1',
  'device:192.168.2.1:8080',
  'device:192.168.2.1/path',
  'device:192.168.2.1?query',
  'device:192.168.2.1#fragment',
  'device:192.168.2.1/path?query#fragment'
].each do |input|
  normalized = OpenIDConnect::Discovery::URINormalizer.new(input).normalized
  puts "#{input} => #{normalized}"
end


## INPUT => NORMALIZED
# example.com                                     => https://example.com
# example.com:8080                                => https://example.com:8080
# example.com/path                                => https://example.com/path
# example.com?query                               => https://example.com?query
# example.com#fragment                            => https://example.com
# example.com:8080/path?query#fragment            => https://example.com:8080/path?query
# http://example.com                              => http://example.com
# http://example.com:8080                         => http://example.com:8080
# http://example.com/path                         => http://example.com/path
# http://example.com?query                        => http://example.com?query
# http://example.com#fragment                     => http://example.com
# http://example.com:8080/path?query#fragment     => http://example.com:8080/path?query
# nov@example.com                                 => acct:nov@example.com
# nov@example.com:8080                            => https://nov@example.com:8080
# nov@example.com/path                            => https://nov@example.com/path
# nov@example.com?query                           => https://nov@example.com?query
# nov@example.com#fragment                        => acct:nov@example.com
# nov@example.com:8080/path?query#fragment        => https://nov@example.com:8080/path?query
# acct:nov@matake.jp                              => acct:nov@matake.jp
# acct:nov@example.com:8080                       => acct:nov@example.com:8080
# acct:nov@example.com/path                       => acct:nov@example.com/path
# acct:nov@example.com?query                      => acct:nov@example.com?query
# acct:nov@example.com#fragment                   => acct:nov@example.com
# acct:nov@example.com:8080/path?query#fragment   => acct:nov@example.com:8080/path?query
# mailto:nov@matake.jp                            => mailto:nov@matake.jp
# mailto:nov@example.com:8080                     => mailto:nov@example.com:8080
# mailto:nov@example.com/path                     => mailto:nov@example.com/path
# mailto:nov@example.com?query                    => mailto:nov@example.com?query
# mailto:nov@example.com#fragment                 => mailto:nov@example.com
# mailto:nov@example.com:8080/path?query#fragment => mailto:nov@example.com:8080/path?query
# localhost                                       => https://localhost
# localhost:8080                                  => https://localhost:8080
# localhost/path                                  => https://localhost/path
# localhost?query                                 => https://localhost?query
# localhost#fragment                              => https://localhost
# localhost/path?query#fragment                   => https://localhost/path?query
# nov@localhost                                   => acct:nov@localhost
# nov@localhost:8080                              => https://nov@localhost:8080
# nov@localhost/path                              => https://nov@localhost/path
# nov@localhost?query                             => https://nov@localhost?query
# nov@localhost#fragment                          => acct:nov@localhost
# nov@localhost/path?query#fragment               => https://nov@localhost/path?query
# tel:+810312345678                               => tel:+810312345678
# device:192.168.2.1                              => device:192.168.2.1
# device:192.168.2.1:8080                         => device:192.168.2.1:8080
# device:192.168.2.1/path                         => device:192.168.2.1/path
# device:192.168.2.1?query                        => device:192.168.2.1?query
# device:192.168.2.1#fragment                     => device:192.168.2.1
# device:192.168.2.1/path?query#fragment          => device:192.168.2.1/path?query