require 'rack/mount' require 'forwardable' require 'active_support/core_ext/object/to_query' require 'active_support/core_ext/hash/slice' module ActionDispatch module Routing class RouteSet #:nodoc: PARAMETERS_KEY = 'action_dispatch.request.path_parameters' class Dispatcher #:nodoc: def initialize(options={}) @defaults = options[:defaults] @glob_param = options.delete(:glob) @controllers = {} end def call(env) params = env[PARAMETERS_KEY] prepare_params!(params) # Just raise undefined constant errors if a controller was specified as default. unless controller = controller(params, @defaults.key?(:controller)) return [404, {'X-Cascade' => 'pass'}, []] end dispatch(controller, params[:action], env) end def prepare_params!(params) merge_default_action!(params) split_glob_param!(params) if @glob_param end # If this is a default_controller (i.e. a controller specified by the user) # we should raise an error in case it's not found, because it usually means # an user error. However, if the controller was retrieved through a dynamic # segment, as in :controller(/:action), we should simply return nil and # delegate the control back to Rack cascade. Besides, if this is not a default # controller, it means we should respect the @scope[:module] parameter. def controller(params, default_controller=true) if params && params.key?(:controller) controller_param = params[:controller] controller_reference(controller_param) end rescue NameError => e raise ActionController::RoutingError, e.message, e.backtrace if default_controller end private def controller_reference(controller_param) unless controller = @controllers[controller_param] controller_name = "#{controller_param.camelize}Controller" controller = @controllers[controller_param] = ActiveSupport::Dependencies.ref(controller_name) end controller.get end def dispatch(controller, action, env) controller.action(action).call(env) end def merge_default_action!(params) params[:action] ||= 'index' end def split_glob_param!(params) params[@glob_param] = params[@glob_param].split('/').map { |v| URI.parser.unescape(v) } end end # A NamedRouteCollection instance is a collection of named routes, and also # maintains an anonymous module that can be used to install helpers for the # named routes. class NamedRouteCollection #:nodoc: include Enumerable attr_reader :routes, :helpers, :module def initialize clear! end def helper_names self.module.instance_methods.map(&:to_s) end def clear! @routes = {} @helpers = [] @module ||= Module.new do instance_methods.each { |selector| remove_method(selector) } end end def add(name, route) routes[name.to_sym] = route define_named_route_methods(name, route) end def get(name) routes[name.to_sym] end alias []= add alias [] get alias clear clear! def each routes.each { |name, route| yield name, route } self end def names routes.keys end def length routes.length end def reset! old_routes = routes.dup clear! old_routes.each do |name, route| add(name, route) end end def install(destinations = [ActionController::Base, ActionView::Base], regenerate = false) reset! if regenerate Array(destinations).each do |dest| dest.__send__(:include, @module) end end private def url_helper_name(name, kind = :url) :"#{name}_#{kind}" end def hash_access_name(name, kind = :url) :"hash_for_#{name}_#{kind}" end def define_named_route_methods(name, route) {:url => {:only_path => false}, :path => {:only_path => true}}.each do |kind, opts| hash = route.defaults.merge(:use_route => name).merge(opts) define_hash_access route, name, kind, hash define_url_helper route, name, kind, hash end end def define_hash_access(route, name, kind, options) selector = hash_access_name(name, kind) # We use module_eval to avoid leaks @module.module_eval <<-END_EVAL, __FILE__, __LINE__ + 1 remove_method :#{selector} if method_defined?(:#{selector}) def #{selector}(*args) options = args.extract_options! if args.any? options[:_positional_args] = args options[:_positional_keys] = #{route.segment_keys.inspect} end options ? #{options.inspect}.merge(options) : #{options.inspect} end protected :#{selector} END_EVAL helpers << selector end # Create a url helper allowing ordered parameters to be associated # with corresponding dynamic segments, so you can do: # # foo_url(bar, baz, bang) # # Instead of: # # foo_url(:bar => bar, :baz => baz, :bang => bang) # # Also allow options hash, so you can do: # # foo_url(bar, baz, bang, :sort_by => 'baz') # def define_url_helper(route, name, kind, options) selector = url_helper_name(name, kind) hash_access_method = hash_access_name(name, kind) @module.module_eval <<-END_EVAL, __FILE__, __LINE__ + 1 remove_method :#{selector} if method_defined?(:#{selector}) def #{selector}(*args) url_for(#{hash_access_method}(*args)) end END_EVAL helpers << selector end end attr_accessor :set, :routes, :named_routes, :default_scope attr_accessor :disable_clear_and_finalize, :resources_path_names attr_accessor :default_url_options, :request_class, :valid_conditions def self.default_resources_path_names { :new => 'new', :edit => 'edit' } end def initialize(request_class = ActionDispatch::Request) self.routes = [] self.named_routes = NamedRouteCollection.new self.resources_path_names = self.class.default_resources_path_names.dup self.default_url_options = {} self.request_class = request_class self.valid_conditions = request_class.public_instance_methods.map { |m| m.to_sym } self.valid_conditions.delete(:id) self.valid_conditions.push(:controller, :action) @append = [] @disable_clear_and_finalize = false clear! end def draw(&block) clear! unless @disable_clear_and_finalize eval_block(block) finalize! unless @disable_clear_and_finalize nil end def append(&block) @append << block end def eval_block(block) mapper = Mapper.new(self) if default_scope mapper.with_default_scope(default_scope, &block) else mapper.instance_exec(&block) end end def finalize! return if @finalized @append.each { |blk| eval_block(blk) } @finalized = true @set.freeze end def clear! # Clear the controller cache so we may discover new ones @controller_constraints = nil @finalized = false routes.clear named_routes.clear @set = ::Rack::Mount::RouteSet.new( :parameters_key => PARAMETERS_KEY, :request_class => request_class ) end def install_helpers(destinations = [ActionController::Base, ActionView::Base], regenerate_code = false) Array(destinations).each { |d| d.module_eval { include Helpers } } named_routes.install(destinations, regenerate_code) end module MountedHelpers end def mounted_helpers(name = :main_app) define_mounted_helper(name) if name MountedHelpers end def define_mounted_helper(name) return if MountedHelpers.method_defined?(name) routes = self MountedHelpers.class_eval do define_method "_#{name}" do RoutesProxy.new(routes, self._routes_context) end end MountedHelpers.class_eval <<-RUBY def #{name} @#{name} ||= _#{name} end RUBY end def url_helpers @url_helpers ||= begin routes = self helpers = Module.new do extend ActiveSupport::Concern include UrlFor @_routes = routes class << self delegate :url_for, :to => '@_routes' end extend routes.named_routes.module # ROUTES TODO: install_helpers isn't great... can we make a module with the stuff that # we can include? # Yes plz - JP included do routes.install_helpers(self) singleton_class.send(:redefine_method, :_routes) { routes } end define_method(:_routes) { @_routes || routes } end helpers end end def empty? routes.empty? end def add_route(app, conditions = {}, requirements = {}, defaults = {}, name = nil, anchor = true) route = Route.new(self, app, conditions, requirements, defaults, name, anchor) @set.add_route(*route) named_routes[name] = route if name routes << route route end class Generator #:nodoc: PARAMETERIZE = { :parameterize => lambda do |name, value| if name == :controller value elsif value.is_a?(Array) value.map { |v| Rack::Mount::Utils.escape_uri(v.to_param) }.join('/') else return nil unless param = value.to_param param.split('/').map { |v| Rack::Mount::Utils.escape_uri(v) }.join("/") end end } attr_reader :options, :recall, :set, :named_route def initialize(options, recall, set, extras = false) @named_route = options.delete(:use_route) @options = options.dup @recall = recall.dup @set = set @extras = extras normalize_options! normalize_controller_action_id! use_relative_controller! controller.sub!(%r{^/}, '') if controller handle_nil_action! end def controller @controller ||= @options[:controller] end def current_controller @recall[:controller] end def use_recall_for(key) if @recall[key] && (!@options.key?(key) || @options[key] == @recall[key]) if named_route_exists? @options[key] = @recall.delete(key) if segment_keys.include?(key) else @options[key] = @recall.delete(key) end end end def normalize_options! # If an explicit :controller was given, always make :action explicit # too, so that action expiry works as expected for things like # # generate({:controller => 'content'}, {:controller => 'content', :action => 'show'}) # # (the above is from the unit tests). In the above case, because the # controller was explicitly given, but no action, the action is implied to # be "index", not the recalled action of "show". if options[:controller] options[:action] ||= 'index' options[:controller] = options[:controller].to_s end if options[:action] options[:action] = options[:action].to_s end end # This pulls :controller, :action, and :id out of the recall. # The recall key is only used if there is no key in the options # or if the key in the options is identical. If any of # :controller, :action or :id is not found, don't pull any # more keys from the recall. def normalize_controller_action_id! @recall[:action] ||= 'index' if current_controller use_recall_for(:controller) or return use_recall_for(:action) or return use_recall_for(:id) end # if the current controller is "foo/bar/baz" and :controller => "baz/bat" # is specified, the controller becomes "foo/baz/bat" def use_relative_controller! if !named_route && different_controller? old_parts = current_controller.split('/') size = controller.count("/") + 1 parts = old_parts[0...-size] << controller @controller = @options[:controller] = parts.join("/") end end # This handles the case of :action => nil being explicitly passed. # It is identical to :action => "index" def handle_nil_action! if options.has_key?(:action) && options[:action].nil? options[:action] = 'index' end recall[:action] = options.delete(:action) if options[:action] == 'index' end def generate path, params = @set.set.generate(:path_info, named_route, options, recall, PARAMETERIZE) raise_routing_error unless path return [path, params.keys] if @extras [path, params] rescue Rack::Mount::RoutingError raise_routing_error end def raise_routing_error raise ActionController::RoutingError.new("No route matches #{options.inspect}") end def different_controller? return false unless current_controller controller.to_param != current_controller.to_param end private def named_route_exists? named_route && set.named_routes[named_route] end def segment_keys set.named_routes[named_route].segment_keys end end # Generate the path indicated by the arguments, and return an array of # the keys that were not used to generate it. def extra_keys(options, recall={}) generate_extras(options, recall).last end def generate_extras(options, recall={}) generate(options, recall, true) end def generate(options, recall = {}, extras = false) Generator.new(options, recall, self, extras).generate end RESERVED_OPTIONS = [:host, :protocol, :port, :subdomain, :domain, :tld_length, :trailing_slash, :anchor, :params, :only_path, :script_name] def _generate_prefix(options = {}) nil end def url_for(options) finalize! options = (options || {}).reverse_merge!(default_url_options) handle_positional_args(options) user, password = extract_authentication(options) path_segments = options.delete(:_path_segments) script_name = options.delete(:script_name) path = (script_name.blank? ? _generate_prefix(options) : script_name.chomp('/')).to_s path_options = options.except(*RESERVED_OPTIONS) path_options = yield(path_options) if block_given? path_addition, params = generate(path_options, path_segments || {}) path << path_addition ActionDispatch::Http::URL.url_for(options.merge({ :path => path, :params => params, :user => user, :password => password })) end def call(env) finalize! @set.call(env) end def recognize_path(path, environment = {}) method = (environment[:method] || "GET").to_s.upcase path = Rack::Mount::Utils.normalize_path(path) unless path =~ %r{://} begin env = Rack::MockRequest.env_for(path, {:method => method}) rescue URI::InvalidURIError => e raise ActionController::RoutingError, e.message end req = @request_class.new(env) @set.recognize(req) do |route, matches, params| params.each do |key, value| if value.is_a?(String) value = value.dup.force_encoding(Encoding::BINARY) if value.encoding_aware? params[key] = URI.parser.unescape(value) end end dispatcher = route.app dispatcher = dispatcher.app while dispatcher.is_a?(Mapper::Constraints) if dispatcher.is_a?(Dispatcher) && dispatcher.controller(params, false) dispatcher.prepare_params!(params) return params end end raise ActionController::RoutingError, "No route matches #{path.inspect}" end private def extract_authentication(options) if options[:user] && options[:password] [options.delete(:user), options.delete(:password)] else nil end end def handle_positional_args(options) return unless args = options.delete(:_positional_args) keys = options.delete(:_positional_keys) keys -= options.keys if args.size < keys.size - 1 # take format into account # Tell url_for to skip default_url_options options.merge!(Hash[args.zip(keys).map { |v, k| [k, v] }]) end end end end