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rack-3.0.8
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Filename :
urlmap.rb
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# frozen_string_literal: true require 'set' require_relative 'constants' module Rack # 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 <tt>http://</tt> or <tt>https://</tt>. # # 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. class URLMap def initialize(map = {}) remap(map) end def remap(map) @known_hosts = Set[] @mapping = map.map { |location, app| if location =~ %r{\Ahttps?://(.*?)(/.*)} host, location = $1, $2 @known_hosts << host 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('/', '/+')}(.*)", Regexp::NOENCODING) [host, location, match, app] }.sort_by do |(host, location, _, _)| [host ? -host.size : Float::INFINITY, -location.size] end end 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}") is_host_known = @known_hosts.include? http_host @mapping.each do |host, location, match, app| unless casecmp?(http_host, host) \ || casecmp?(server_name, host) \ || (!host && is_same_server) \ || (!host && !is_host_known) # If we don't have a matching host, default to the first without a specified host 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 private def casecmp?(v1, v2) # if both nil, or they're the same string return true if v1 == v2 # if either are nil... (but they're not the same) return false if v1.nil? return false if v2.nil? # otherwise check they're not case-insensitive the same v1.casecmp(v2).zero? end end end