Class: Puma::Rack::URLMap

Inherits:
Object
  • Object
show all
Defined in:
lib/puma/rack/urlmap.rb

Overview

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.

Constant Summary collapse

NEGATIVE_INFINITY = 
-1.0 / 0.0
INFINITY = 
1.0 / 0.0

Instance Method Summary collapse

Constructor Details

#initialize(map = {}) ⇒ URLMap

Returns a new instance of URLMap.



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# File 'lib/puma/rack/urlmap.rb', line 20

def initialize(map = {})
  remap(map)
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/puma/rack/urlmap.rb', line 45

def call(env)
  path = env['PATH_INFO']
  script_name = env['SCRIPT_NAME']
  http_host = env['HTTP_HOST']
  server_name = env['SERVER_NAME']
  server_port = env['SERVER_PORT']

  is_same_server = casecmp?(http_host, server_name) ||
                casecmp?(http_host, "#{server_name}:#{server_port}")

  @mapping.each do |host, location, match, app|
    unless casecmp?(http_host, host) \
        || casecmp?(server_name, host) \
        || (!host && is_same_server)
      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

#remap(map) ⇒ Object 



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# File 'lib/puma/rack/urlmap.rb', line 24

def remap(map)
  @mapping = map.map { |location, app|
    if location =~ %r{\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