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require 'uri' module Rack # Rack::ForwardRequest gets caught by Rack::Recursive and redirects # the current request to the app at +url+. # # raise ForwardRequest.new("/not-found") # class ForwardRequest < Exception attr_reader :url, :env def initialize(url, env={}) @url = URI(url) @env = env @env[PATH_INFO] = @url.path @env[QUERY_STRING] = @url.query if @url.query @env["HTTP_HOST"] = @url.host if @url.host @env["HTTP_PORT"] = @url.port if @url.port @env["rack.url_scheme"] = @url.scheme if @url.scheme super "forwarding to #{url}" end end # Rack::Recursive allows applications called down the chain to # include data from other applications (by using # <tt>rack['rack.recursive.include'][...]</tt> or raise a # ForwardRequest to redirect internally. class Recursive def initialize(app) @app = app end def call(env) dup._call(env) end def _call(env) @script_name = env[SCRIPT_NAME] @app.call(env.merge('rack.recursive.include' => method(:include))) rescue ForwardRequest => req call(env.merge(req.env)) end def include(env, path) unless path.index(@script_name) == 0 && (path[@script_name.size] == ?/ \|\| path[@script_name.size].nil?) raise ArgumentError, "can only include below #{@script_name}, not #{path}" end env = env.merge(PATH_INFO => path, SCRIPT_NAME => @script_name, REQUEST_METHOD => "GET", "CONTENT_LENGTH" => "0", "CONTENT_TYPE" => "", "rack.input" => StringIO.new("")) @app.call(env) end end end