aboutsummaryrefslogtreecommitdiffstats
path: root/actionpack/lib/action_dispatch/routing/route_set.rb
blob: 310e98f584e9e53e347fe6a0b0bef22d53b9ef48 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
require 'action_dispatch/journey'
require 'active_support/concern'
require 'active_support/core_ext/object/to_query'
require 'active_support/core_ext/hash/slice'
require 'active_support/core_ext/module/remove_method'
require 'active_support/core_ext/array/extract_options'
require 'action_controller/metal/exceptions'
require 'action_dispatch/http/request'
require 'action_dispatch/routing/endpoint'

module ActionDispatch
  module Routing
    # :stopdoc:
    class RouteSet
      # Since the router holds references to many parts of the system
      # like engines, controllers and the application itself, inspecting
      # the route set can actually be really slow, therefore we default
      # alias inspect to to_s.
      alias inspect to_s

      class Dispatcher < Routing::Endpoint
        def initialize(raise_on_name_error)
          @raise_on_name_error = raise_on_name_error
        end

        def dispatcher?; true; end

        def serve(req)
          params     = req.path_parameters
          controller = controller req
          res        = controller.make_response! req
          dispatch(controller, params[:action], req, res)
        rescue ActionController::RoutingError
          if @raise_on_name_error
            raise
          else
            return [404, {'X-Cascade' => 'pass'}, []]
          end
        end

      private

        def controller(req)
          req.controller_class
        rescue NameError => e
          raise ActionController::RoutingError, e.message, e.backtrace
        end

        def dispatch(controller, action, req, res)
          controller.dispatch(action, req, res)
        end
      end

      class StaticDispatcher < Dispatcher
        def initialize(controller_class)
          super(false)
          @controller_class = controller_class
        end

        private

        def controller(_); @controller_class; 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
        include Enumerable
        attr_reader :routes, :url_helpers_module, :path_helpers_module
        private :routes

        def initialize
          @routes  = {}
          @path_helpers = Set.new
          @url_helpers = Set.new
          @url_helpers_module  = Module.new
          @path_helpers_module = Module.new
        end

        def route_defined?(name)
          key = name.to_sym
          @path_helpers.include?(key) || @url_helpers.include?(key)
        end

        def helper_names
          @path_helpers.map(&:to_s) + @url_helpers.map(&:to_s)
        end

        def clear!
          @path_helpers.each do |helper|
            @path_helpers_module.send :undef_method, helper
          end

          @url_helpers.each do |helper|
            @url_helpers_module.send  :undef_method, helper
          end

          @routes.clear
          @path_helpers.clear
          @url_helpers.clear
        end

        def add(name, route)
          key       = name.to_sym
          path_name = :"#{name}_path"
          url_name  = :"#{name}_url"

          if routes.key? key
            @path_helpers_module.send :undef_method, path_name
            @url_helpers_module.send  :undef_method, url_name
          end
          routes[key] = route
          define_url_helper @path_helpers_module, route, path_name, route.defaults, name, PATH
          define_url_helper @url_helpers_module,  route, url_name,  route.defaults, name, UNKNOWN

          @path_helpers << path_name
          @url_helpers << url_name
        end

        def get(name)
          routes[name.to_sym]
        end

        def key?(name)
          return unless name
          routes.key? 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

        class UrlHelper
          def self.create(route, options, route_name, url_strategy)
            if optimize_helper?(route)
              OptimizedUrlHelper.new(route, options, route_name, url_strategy)
            else
              new route, options, route_name, url_strategy
            end
          end

          def self.optimize_helper?(route)
            !route.glob? && route.path.requirements.empty?
          end

          attr_reader :url_strategy, :route_name

          class OptimizedUrlHelper < UrlHelper
            attr_reader :arg_size

            def initialize(route, options, route_name, url_strategy)
              super
              @required_parts = @route.required_parts
              @arg_size       = @required_parts.size
            end

            def call(t, args, inner_options)
              if args.size == arg_size && !inner_options && optimize_routes_generation?(t)
                options = t.url_options.merge @options
                options[:path] = optimized_helper(args)
                url_strategy.call options
              else
                super
              end
            end

            private

            def optimized_helper(args)
              params = parameterize_args(args) do
                raise_generation_error(args)
              end

              @route.format params
            end

            def optimize_routes_generation?(t)
              t.send(:optimize_routes_generation?)
            end

            def parameterize_args(args)
              params = {}
              @arg_size.times { |i|
                key = @required_parts[i]
                value = args[i].to_param
                yield key if value.nil? || value.empty?
                params[key] = value
              }
              params
            end

            def raise_generation_error(args)
              missing_keys = []
              params = parameterize_args(args) { |missing_key|
                missing_keys << missing_key
              }
              constraints = Hash[@route.requirements.merge(params).sort_by{|k,v| k.to_s}]
              message = "No route matches #{constraints.inspect}"
              message << " missing required keys: #{missing_keys.sort.inspect}"

              raise ActionController::UrlGenerationError, message
            end
          end

          def initialize(route, options, route_name, url_strategy)
            @options      = options
            @segment_keys = route.segment_keys.uniq
            @route        = route
            @url_strategy = url_strategy
            @route_name   = route_name
          end

          def call(t, args, inner_options)
            controller_options = t.url_options
            options = controller_options.merge @options
            hash = handle_positional_args(controller_options,
                                          inner_options || {},
                                          args,
                                          options,
                                          @segment_keys)

            t._routes.url_for(hash, route_name, url_strategy)
          end

          def handle_positional_args(controller_options, inner_options, args, result, path_params)
            if args.size > 0
              # take format into account
              if path_params.include?(:format)
                path_params_size = path_params.size - 1
              else
                path_params_size = path_params.size
              end

              if args.size < path_params_size
                path_params -= controller_options.keys
                path_params -= result.keys
              end
              inner_options.each_key do |key|
                path_params.delete(key)
              end

              args.each_with_index do |arg, index|
                param = path_params[index]
                result[param] = arg if param
              end
            end

            result.merge!(inner_options)
          end
        end

        private
        # 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(mod, route, name, opts, route_key, url_strategy)
          helper = UrlHelper.create(route, opts, route_key, url_strategy)
          mod.module_eval do
            define_method(name) do |*args|
              last = args.last
              options = case last
                        when Hash
                          args.pop
                        when ActionController::Parameters
                          if last.permitted?
                            args.pop.to_h
                          else
                            raise ArgumentError, "Generating a URL from non sanitized request parameters is insecure!"
                          end
                        end
              helper.call self, args, options
            end
          end
        end
      end

      # strategy for building urls to send to the client
      PATH    = ->(options) { ActionDispatch::Http::URL.path_for(options) }
      UNKNOWN = ->(options) { ActionDispatch::Http::URL.url_for(options) }

      attr_accessor :formatter, :set, :named_routes, :default_scope, :router
      attr_accessor :disable_clear_and_finalize, :resources_path_names
      attr_accessor :default_url_options
      attr_reader :env_key

      alias :routes :set

      def self.default_resources_path_names
        { :new => 'new', :edit => 'edit' }
      end

      def self.new_with_config(config)
        route_set_config = DEFAULT_CONFIG

        # engines apparently don't have this set
        if config.respond_to? :relative_url_root
          route_set_config.relative_url_root = config.relative_url_root
        end

        if config.respond_to? :api_only
          route_set_config.api_only = config.api_only
        end

        new route_set_config
      end

      Config = Struct.new :relative_url_root, :api_only

      DEFAULT_CONFIG = Config.new(nil, false)

      def initialize(config = DEFAULT_CONFIG)
        self.named_routes = NamedRouteCollection.new
        self.resources_path_names = self.class.default_resources_path_names
        self.default_url_options = {}

        @config                     = config
        @append                     = []
        @prepend                    = []
        @disable_clear_and_finalize = false
        @finalized                  = false
        @env_key                    = "ROUTES_#{object_id}_SCRIPT_NAME".freeze

        @set    = Journey::Routes.new
        @router = Journey::Router.new @set
        @formatter = Journey::Formatter.new self
      end

      def relative_url_root
        @config.relative_url_root
      end

      def api_only?
        @config.api_only
      end

      def request_class
        ActionDispatch::Request
      end

      def make_request(env)
        request_class.new env
      end
      private :make_request

      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 prepend(&block)
        @prepend << 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
      private :eval_block

      def finalize!
        return if @finalized
        @append.each { |blk| eval_block(blk) }
        @finalized = true
      end

      def clear!
        @finalized = false
        named_routes.clear
        set.clear
        formatter.clear
        @prepend.each { |blk| eval_block(blk) }
      end

      module MountedHelpers
        extend ActiveSupport::Concern
        include UrlFor
      end

      # Contains all the mounted helpers across different
      # engines and the `main_app` helper for the application.
      # You can include this in your classes if you want to
      # access routes for other engines.
      def mounted_helpers
        MountedHelpers
      end

      def define_mounted_helper(name)
        return if MountedHelpers.method_defined?(name)

        routes = self
        helpers = routes.url_helpers

        MountedHelpers.class_eval do
          define_method "_#{name}" do
            RoutesProxy.new(routes, _routes_context, helpers)
          end
        end

        MountedHelpers.class_eval(<<-RUBY, __FILE__, __LINE__ + 1)
          def #{name}
            @_#{name} ||= _#{name}
          end
        RUBY
      end

      def url_helpers(supports_path = true)
        routes = self

        Module.new do
          extend ActiveSupport::Concern
          include UrlFor

          # Define url_for in the singleton level so one can do:
          # Rails.application.routes.url_helpers.url_for(args)
          @_routes = routes
          class << self
            def url_for(options)
              @_routes.url_for(options)
            end

            def optimize_routes_generation?
              @_routes.optimize_routes_generation?
            end

            attr_reader :_routes
            def url_options; {}; end
          end

          url_helpers = routes.named_routes.url_helpers_module

          # Make named_routes available in the module singleton
          # as well, so one can do:
          # Rails.application.routes.url_helpers.posts_path
          extend url_helpers

          # Any class that includes this module will get all
          # named routes...
          include url_helpers

          if supports_path
            path_helpers = routes.named_routes.path_helpers_module

            include path_helpers
            extend path_helpers
          end

          # plus a singleton class method called _routes ...
          included do
            singleton_class.send(:redefine_method, :_routes) { routes }
          end

          # And an instance method _routes. Note that
          # UrlFor (included in this module) add extra
          # conveniences for working with @_routes.
          define_method(:_routes) { @_routes || routes }

          define_method(:_generate_paths_by_default) do
            supports_path
          end

          private :_generate_paths_by_default
        end
      end

      def empty?
        routes.empty?
      end

      def add_route(mapping, path_ast, name, anchor)
        raise ArgumentError, "Invalid route name: '#{name}'" unless name.blank? || name.to_s.match(/^[_a-z]\w*$/i)

        if name && named_routes[name]
          raise ArgumentError, "Invalid route name, already in use: '#{name}' \n" \
            "You may have defined two routes with the same name using the `:as` option, or " \
            "you may be overriding a route already defined by a resource with the same naming. " \
            "For the latter, you can restrict the routes created with `resources` as explained here: \n" \
            "http://guides.rubyonrails.org/routing.html#restricting-the-routes-created"
        end

        route = @set.add_route(name, mapping)
        named_routes[name] = route if name
        route
      end

      class Generator
        PARAMETERIZE = lambda do |name, value|
          if name == :controller
            value
          else
            value.to_param
          end
        end

        attr_reader :options, :recall, :set, :named_route

        def initialize(named_route, options, recall, set)
          @named_route = named_route
          @options     = options
          @recall      = recall
          @set         = set

          normalize_recall!
          normalize_options!
          normalize_controller_action_id!
          use_relative_controller!
          normalize_controller!
          normalize_action!
        end

        def 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? || segment_keys.include?(key)
              @options[key] = @recall[key]
            end
          end
        end

        # Set 'index' as default action for recall
        def normalize_recall!
          @recall[:action] ||= 'index'
        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.key?(:action)
            options[:action] = (options[:action] || 'index').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!
          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? && !controller.start_with?("/")
            old_parts = current_controller.split('/')
            size = controller.count("/") + 1
            parts = old_parts[0...-size] << controller
            @options[:controller] = parts.join("/")
          end
        end

        # Remove leading slashes from controllers
        def normalize_controller!
          if controller
            if controller.start_with?("/".freeze)
              @options[:controller] = controller[1..-1]
            else
              @options[:controller] = controller
            end
          end
        end

        # Move 'index' action from options to recall
        def normalize_action!
          if @options[:action] == 'index'.freeze
            @recall[:action] = @options.delete(:action)
          end
        end

        # Generates a path from routes, returns [path, params].
        # If no route is generated the formatter will raise ActionController::UrlGenerationError
        def generate
          @set.formatter.generate(named_route, options, recall, PARAMETERIZE)
        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={})
        route_key = options.delete :use_route
        path, params = generate(route_key, options, recall)
        return path, params.keys
      end

      def generate(route_key, options, recall = {})
        Generator.new(route_key, options, recall, self).generate
      end
      private :generate

      RESERVED_OPTIONS = [:host, :protocol, :port, :subdomain, :domain, :tld_length,
                          :trailing_slash, :anchor, :params, :only_path, :script_name,
                          :original_script_name, :relative_url_root]

      def optimize_routes_generation?
        default_url_options.empty?
      end

      def find_script_name(options)
        options.delete(:script_name) || find_relative_url_root(options) || ''
      end

      def find_relative_url_root(options)
        options.delete(:relative_url_root) || relative_url_root
      end

      def path_for(options, route_name = nil)
        url_for(options, route_name, PATH)
      end

      # The +options+ argument must be a hash whose keys are *symbols*.
      def url_for(options, route_name = nil, url_strategy = UNKNOWN)
        options = default_url_options.merge options

        user = password = nil

        if options[:user] && options[:password]
          user     = options.delete :user
          password = options.delete :password
        end

        recall  = options.delete(:_recall) { {} }

        original_script_name = options.delete(:original_script_name)
        script_name = find_script_name options

        if original_script_name
          script_name = original_script_name + script_name
        end

        path_options = options.dup
        RESERVED_OPTIONS.each { |ro| path_options.delete ro }

        path, params = generate(route_name, path_options, recall)

        if options.key? :params
          params.merge! options[:params]
        end

        options[:path]        = path
        options[:script_name] = script_name
        options[:params]      = params
        options[:user]        = user
        options[:password]    = password

        url_strategy.call options
      end

      def call(env)
        req = make_request(env)
        req.path_info = Journey::Router::Utils.normalize_path(req.path_info)
        @router.serve(req)
      end

      def recognize_path(path, environment = {})
        method = (environment[:method] || "GET").to_s.upcase
        path = Journey::Router::Utils.normalize_path(path) unless path =~ %r{://}
        extras = environment[:extras] || {}

        begin
          env = Rack::MockRequest.env_for(path, {:method => method})
        rescue URI::InvalidURIError => e
          raise ActionController::RoutingError, e.message
        end

        req = make_request(env)
        @router.recognize(req) do |route, params|
          params.merge!(extras)
          params.each do |key, value|
            if value.is_a?(String)
              value = value.dup.force_encoding(Encoding::BINARY)
              params[key] = URI.parser.unescape(value)
            end
          end
          old_params = req.path_parameters
          req.path_parameters = old_params.merge params
          app = route.app
          if app.matches?(req) && app.dispatcher?
            begin
              req.controller_class
            rescue NameError
              raise ActionController::RoutingError, "A route matches #{path.inspect}, but references missing controller: #{params[:controller].camelize}Controller"
            end

            return req.path_parameters
          end
        end

        raise ActionController::RoutingError, "No route matches #{path.inspect}"
      end
    end
    # :startdoc:
  end
end