aboutsummaryrefslogtreecommitdiffstats
path: root/actionpack/lib/action_dispatch/journey/router.rb
blob: 2b036796ab44117e265eaada841d09bb749a1e17 (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
require 'action_dispatch/journey/router/utils'
require 'action_dispatch/journey/router/strexp'
require 'action_dispatch/journey/routes'
require 'action_dispatch/journey/formatter'

before = $-w
$-w = false
require 'action_dispatch/journey/parser'
$-w = before

require 'action_dispatch/journey/route'
require 'action_dispatch/journey/path/pattern'

module ActionDispatch
  module Journey # :nodoc:
    class Router # :nodoc:
      class RoutingError < ::StandardError # :nodoc:
      end

      # :nodoc:
      VERSION = '2.0.0'

      attr_accessor :routes

      def initialize(routes)
        @routes = routes
      end

      def serve(req)
        find_routes(req).each do |match, parameters, route|
          set_params  = req.path_parameters
          path_info   = req.path_info
          script_name = req.script_name

          unless route.path.anchored
            req.script_name = (script_name.to_s + match.to_s).chomp('/')
            req.path_info = match.post_match
            req.path_info = "/" + req.path_info unless req.path_info.start_with? "/"
          end

          req.path_parameters = set_params.merge parameters

          status, headers, body = route.app.serve(req)

          if 'pass' == headers['X-Cascade']
            req.script_name     = script_name
            req.path_info       = path_info
            req.path_parameters = set_params
            next
          end

          return [status, headers, body]
        end

        return [404, {'X-Cascade' => 'pass'}, ['Not Found']]
      end

      def recognize(rails_req)
        find_routes(rails_req).each do |match, parameters, route|
          unless route.path.anchored
            rails_req.script_name = match.to_s
            rails_req.path_info   = match.post_match.sub(/^([^\/])/, '/\1')
          end

          yield(route, parameters)
        end
      end

      def visualizer
        tt     = GTG::Builder.new(ast).transition_table
        groups = partitioned_routes.first.map(&:ast).group_by(&:to_s)
        asts   = groups.values.map(&:first)
        tt.visualizer(asts)
      end

      private

        def partitioned_routes
          routes.partitioned_routes
        end

        def ast
          routes.ast
        end

        def simulator
          routes.simulator
        end

        def custom_routes
          partitioned_routes.last
        end

        def filter_routes(path)
          return [] unless ast
          simulator.memos(path) { [] }
        end

        def find_routes req
          routes = filter_routes(req.path_info).concat custom_routes.find_all { |r|
            r.path.match(req.path_info)
          }

          routes =
            if req.request_method == "HEAD"
              match_head_routes(routes, req)
            else
              match_routes(routes, req)
            end

          routes.sort_by!(&:precedence)

          routes.map! { |r|
            match_data  = r.path.match(req.path_info)
            path_parameters = r.defaults.dup
            match_data.names.zip(match_data.captures) { |name,val|
              path_parameters[name.to_sym] = Utils.unescape_uri(val) if val
            }
            [match_data, path_parameters, r]
          }
        end

        def match_head_routes(routes, req)
          head_routes = match_routes(routes, req)

          if head_routes.empty?
            begin
              req.request_method = "GET"
              match_routes(routes, req)
            ensure
              req.request_method = "HEAD"
            end
          else
            head_routes
          end
        end

        def match_routes(routes, req)
          routes.select { |r| r.matches?(req) }
        end
    end
  end
end