Rack::URLMap

# File lib/rack/urlmap.rb, line 18
def initialize(map = {})
  remap(map)
end

# File lib/rack/urlmap.rb, line 43
def call(env)
  path = env[PATH_INFO]
  script_name = env['SCRIPT_NAME']
  hHost = env['HTTP_HOST']
  sName = env['SERVER_NAME']
  sPort = env['SERVER_PORT']

  @mapping.each do |host, location, match, app|
    unless casecmp?(hHost, host)              || casecmp?(sName, host)              || (!host && (casecmp?(hHost, sName) ||
                      casecmp?(hHost, sName+':'+sPort)))
      next
    end

    next unless m = match.match(path.to_s)

    rest = m[1]
    next unless !rest || rest.empty? || rest[0] == //

    env['SCRIPT_NAME'] = (script_name + location)
    env['PATH_INFO'] = rest

    return app.call(env)
  end

  [404, {CONTENT_TYPE => "text/plain", "X-Cascade" => "pass"}, ["Not Found: #{path}"]]

ensure
  env['PATH_INFO'] = path
  env['SCRIPT_NAME'] = script_name
end

# File lib/rack/urlmap.rb, line 22
def remap(map)
  @mapping = map.map { |location, app|
    if location =~ %{\Ahttps?://(.*?)(/.*)}
      host, location = $1, $2
    else
      host = nil
    end

    unless location[0] == //
      raise ArgumentError, "paths need to start with /"
    end

    location = location.chomp('/')
    match = Regexp.new("^#{Regexp.quote(location).gsub('/', '/+')}(.*)", nil, 'n')

    [host, location, match, app]
  }.sort_by do |(host, location, _, _)|
    [host ? -host.size : INFINITY, -location.size]
  end
end