vendor/rails/actionpack/lib/action_controller/vendor/rack-1.0/rack/urlmap.rb

   1 module Rack
   2   # Rack::URLMap takes a hash mapping urls or paths to apps, and
   3   # dispatches accordingly.  Support for HTTP/1.1 host names exists if
   4   # the URLs start with <tt>http://</tt> or <tt>https://</tt>.
   5   #
   6   # URLMap modifies the SCRIPT_NAME and PATH_INFO such that the part
   7   # relevant for dispatch is in the SCRIPT_NAME, and the rest in the
   8   # PATH_INFO.  This should be taken care of when you need to
   9   # reconstruct the URL in order to create links.
  10   #
  11   # URLMap dispatches in such a way that the longest paths are tried
  12   # first, since they are most specific.
  13
  14   class URLMap
  15     def initialize(map = {})
  16       remap(map)
  17     end
  18
  19     def remap(map)
  20       @mapping = map.map { |location, app|
  21         if location =~ %r{\Ahttps?://(.*?)(/.*)}
  22           host, location = $1, $2
  23         else
  24           host = nil
  25         end
  26
  27         unless location[0] == ?/
  28           raise ArgumentError, "paths need to start with /"
  29         end
  30         location = location.chomp('/')
  31
  32         [host, location, app]
  33       }.sort_by { |(h, l, a)| [-l.size, h.to_s.size] }  # Longest path first
  34     end
  35
  36     def call(env)
  37       path = env["PATH_INFO"].to_s.squeeze("/")
  38       script_name = env['SCRIPT_NAME']
  39       hHost, sName, sPort = env.values_at('HTTP_HOST','SERVER_NAME','SERVER_PORT')
  40       @mapping.each { |host, location, app|
  41         next unless (hHost == host || sName == host \
  42           || (host.nil? && (hHost == sName || hHost == sName+':'+sPort)))
  43         next unless location == path[0, location.size]
  44         next unless path[location.size] == nil || path[location.size] == ?/
  45
  46         return app.call(
  47           env.merge(
  48             'SCRIPT_NAME' => (script_name + location),
  49             'PATH_INFO'   => path[location.size..-1]))
  50       }
  51       [404, {"Content-Type" => "text/plain"}, ["Not Found: #{path}"]]
  52     end
  53   end
  54 end
  55