Class Rack::URLMap
In: lib/rack/urlmap.rb
Parent: Object

Rack::URLMap takes a hash mapping urls or paths to apps, and dispatches accordingly. Support for HTTP/1.1 host names exists if the URLs start with http:// or https://.

URLMap modifies the SCRIPT_NAME and PATH_INFO such that the part relevant for dispatch is in the SCRIPT_NAME, and the rest in the PATH_INFO. This should be taken care of when you need to reconstruct the URL in order to create links.

URLMap dispatches in such a way that the longest paths are tried first, since they are most specific.

Methods

call   new  

Public Class methods

[Source]

    # File lib/rack/urlmap.rb, line 15
15:     def initialize(map)
16:       @mapping = map.map { |location, app|
17:         if location =~ %r{\Ahttps?://(.*?)(/.*)}
18:           host, location = $1, $2
19:         else
20:           host = nil
21:         end
22: 
23:         location = ""  if location == "/"
24: 
25:         [host, location, app]
26:       }.sort_by { |(h, l, a)| -l.size } # Longest path first
27:     end

Public Instance methods

[Source]

    # File lib/rack/urlmap.rb, line 29
29:     def call(env)
30:       path = env["PATH_INFO"].to_s.squeeze("/")
31:       hHost, sName, sPort = env.values_at('HTTP_HOST','SERVER_NAME','SERVER_PORT')
32:       @mapping.each { |host, location, app|
33:         if (hHost == host || sName == host \
34:           || (host.nil? && (hHost == sName || hHost == sName+':'+sPort))) \
35:           and location == path[0, location.size] \
36:           and (path[location.size] == nil || path[location.size] == ?/)
37:           env["SCRIPT_NAME"] += location.dup
38:           env["PATH_INFO"] = path[location.size..-1]
39:           env["PATH_INFO"].gsub!(/\/\z/, '')
40:           env["PATH_INFO"] = "/"  if env["PATH_INFO"].empty?
41:           return app.call(env)
42:         end
43:       }
44:       [404, {"Content-Type" => "text/plain"}, ["Not Found: #{path}"]]
45:     end

[Validate]