aboutsummaryrefslogtreecommitdiffstats
path: root/railties/lib/rails/application.rb
blob: b5c5a6191fd5cda5569a44c3891c05be5998a1d5 (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
require 'fileutils'
require 'active_support/core_ext/object/blank'
require 'active_support/key_generator'
require 'rails/engine'

module Rails
  # In Rails 3.0, a Rails::Application object was introduced which is nothing more than
  # an Engine but with the responsibility of coordinating the whole boot process.
  #
  # == Initialization
  #
  # Rails::Application is responsible for executing all railties and engines
  # initializers. It also executes some bootstrap initializers (check
  # Rails::Application::Bootstrap) and finishing initializers, after all the others
  # are executed (check Rails::Application::Finisher).
  #
  # == Configuration
  #
  # Besides providing the same configuration as Rails::Engine and Rails::Railtie,
  # the application object has several specific configurations, for example
  # "cache_classes", "consider_all_requests_local", "filter_parameters",
  # "logger" and so forth.
  #
  # Check Rails::Application::Configuration to see them all.
  #
  # == Routes
  #
  # The application object is also responsible for holding the routes and reloading routes
  # whenever the files change in development.
  #
  # == Middlewares
  #
  # The Application is also responsible for building the middleware stack.
  #
  # == Booting process
  #
  # The application is also responsible for setting up and executing the booting
  # process. From the moment you require "config/application.rb" in your app,
  # the booting process goes like this:
  #
  #   1)  require "config/boot.rb" to setup load paths
  #   2)  require railties and engines
  #   3)  Define Rails.application as "class MyApp::Application < Rails::Application"
  #   4)  Run config.before_configuration callbacks
  #   5)  Load config/environments/ENV.rb
  #   6)  Run config.before_initialize callbacks
  #   7)  Run Railtie#initializer defined by railties, engines and application.
  #       One by one, each engine sets up its load paths, routes and runs its config/initializers/* files.
  #   8)  Custom Railtie#initializers added by railties, engines and applications are executed
  #   9)  Build the middleware stack and run to_prepare callbacks
  #   10) Run config.before_eager_load and eager_load! if eager_load is true
  #   11) Run config.after_initialize callbacks
  #
  class Application < Engine
    autoload :Bootstrap,              'rails/application/bootstrap'
    autoload :Configuration,          'rails/application/configuration'
    autoload :DefaultMiddlewareStack, 'rails/application/default_middleware_stack'
    autoload :Finisher,               'rails/application/finisher'
    autoload :Railties,               'rails/engine/railties'
    autoload :RoutesReloader,         'rails/application/routes_reloader'

    class << self
      def inherited(base)
        raise "You cannot have more than one Rails::Application" if Rails.application
        super
        Rails.application = base.instance
        Rails.application.add_lib_to_load_path!
        ActiveSupport.run_load_hooks(:before_configuration, base.instance)
      end
    end

    attr_accessor :assets, :sandbox
    alias_method :sandbox?, :sandbox
    attr_reader :reloaders

    delegate :default_url_options, :default_url_options=, to: :routes

    def initialize
      super
      @initialized      = false
      @reloaders        = []
      @routes_reloader  = nil
      @app_env_config   = nil
      @ordered_railties = nil
      @railties         = nil
    end

    # Returns true if the application is initialized.
    def initialized?
      @initialized
    end

    # Implements call according to the Rack API. It simply
    # dispatches the request to the underlying middleware stack.
    def call(env)
      env["ORIGINAL_FULLPATH"] = build_original_fullpath(env)
      env["ORIGINAL_SCRIPT_NAME"] = env["SCRIPT_NAME"]
      super(env)
    end

    # Reload application routes regardless if they changed or not.
    def reload_routes!
      routes_reloader.reload!
    end

    # Return the application's KeyGenerator
    def key_generator
      # number of iterations selected based on consultation with the google security
      # team. Details at https://github.com/rails/rails/pull/6952#issuecomment-7661220
      @caching_key_generator ||= begin
        if config.secret_key_base
          key_generator = ActiveSupport::KeyGenerator.new(config.secret_key_base, iterations: 1000)
          ActiveSupport::CachingKeyGenerator.new(key_generator)
        else
          ActiveSupport::LegacyKeyGenerator.new(config.secret_token)
        end
      end
    end

    # Stores some of the Rails initial environment parameters which
    # will be used by middlewares and engines to configure themselves.
    def env_config
      @app_env_config ||= begin
        validate_secret_key_config!

        super.merge({
          "action_dispatch.parameter_filter" => config.filter_parameters,
          "action_dispatch.redirect_filter" => config.filter_redirect,
          "action_dispatch.secret_token" => config.secret_token,
          "action_dispatch.secret_key_base" => config.secret_key_base,
          "action_dispatch.show_exceptions" => config.action_dispatch.show_exceptions,
          "action_dispatch.show_detailed_exceptions" => config.consider_all_requests_local,
          "action_dispatch.logger" => Rails.logger,
          "action_dispatch.backtrace_cleaner" => Rails.backtrace_cleaner,
          "action_dispatch.key_generator" => key_generator,
          "action_dispatch.http_auth_salt" => config.action_dispatch.http_auth_salt,
          "action_dispatch.signed_cookie_salt" => config.action_dispatch.signed_cookie_salt,
          "action_dispatch.encrypted_cookie_salt" => config.action_dispatch.encrypted_cookie_salt,
          "action_dispatch.encrypted_signed_cookie_salt" => config.action_dispatch.encrypted_signed_cookie_salt
        })
      end
    end

    ## Rails internal API

    # This method is called just after an application inherits from Rails::Application,
    # allowing the developer to load classes in lib and use them during application
    # configuration.
    #
    #   class MyApplication < Rails::Application
    #     require "my_backend" # in lib/my_backend
    #     config.i18n.backend = MyBackend
    #   end
    #
    # Notice this method takes into consideration the default root path. So if you
    # are changing config.root inside your application definition or having a custom
    # Rails application, you will need to add lib to $LOAD_PATH on your own in case
    # you need to load files in lib/ during the application configuration as well.
    def add_lib_to_load_path! #:nodoc:
      path = File.join config.root, 'lib'
      $LOAD_PATH.unshift(path) if File.exists?(path)
    end

    def require_environment! #:nodoc:
      environment = paths["config/environment"].existent.first
      require environment if environment
    end

    def routes_reloader #:nodoc:
      @routes_reloader ||= RoutesReloader.new
    end

    # Returns an array of file paths appended with a hash of
    # directories-extensions suitable for ActiveSupport::FileUpdateChecker
    # API.
    def watchable_args #:nodoc:
      files, dirs = config.watchable_files.dup, config.watchable_dirs.dup

      ActiveSupport::Dependencies.autoload_paths.each do |path|
        dirs[path.to_s] = [:rb]
      end

      [files, dirs]
    end

    # Initialize the application passing the given group. By default, the
    # group is :default
    def initialize!(group=:default) #:nodoc:
      raise "Application has been already initialized." if @initialized
      run_initializers(group, self)
      @initialized = true
      self
    end

    def initializers #:nodoc:
      Bootstrap.initializers_for(self) +
      railties_initializers(super) +
      Finisher.initializers_for(self)
    end

    def config #:nodoc:
      @config ||= Application::Configuration.new(find_root_with_flag("config.ru", Dir.pwd))
    end

    def to_app #:nodoc:
      self
    end

    def helpers_paths #:nodoc:
      config.helpers_paths
    end

  protected

    alias :build_middleware_stack :app

    def run_tasks_blocks(app) #:nodoc:
      railties.each { |r| r.run_tasks_blocks(app) }
      super
      require "rails/tasks"
      config = self.config
      task :environment do
        config.eager_load = false
        require_environment!
      end
    end

    def run_generators_blocks(app) #:nodoc:
      railties.each { |r| r.run_generators_blocks(app) }
      super
    end

    def run_runner_blocks(app) #:nodoc:
      railties.each { |r| r.run_runner_blocks(app) }
      super
    end

    def run_console_blocks(app) #:nodoc:
      railties.each { |r| r.run_console_blocks(app) }
      super
    end

    # Returns the ordered railties for this application considering railties_order.
    def ordered_railties #:nodoc:
      @ordered_railties ||= begin
        order = config.railties_order.map do |railtie|
          if railtie == :main_app
            self
          elsif railtie.respond_to?(:instance)
            railtie.instance
          else
            railtie
          end
        end

        all = (railties - order)
        all.push(self)   unless (all + order).include?(self)
        order.push(:all) unless order.include?(:all)

        index = order.index(:all)
        order[index] = all
        order.reverse.flatten
      end
    end

    def railties_initializers(current) #:nodoc:
      initializers = []
      ordered_railties.each do |r|
        if r == self
          initializers += current
        else
          initializers += r.initializers
        end
      end
      initializers
    end

    def default_middleware_stack #:nodoc:
      default_stack = DefaultMiddlewareStack.new(self, config, paths)
      default_stack.build_stack
    end

    def build_original_fullpath(env) #:nodoc:
      path_info    = env["PATH_INFO"]
      query_string = env["QUERY_STRING"]
      script_name  = env["SCRIPT_NAME"]

      if query_string.present?
        "#{script_name}#{path_info}?#{query_string}"
      else
        "#{script_name}#{path_info}"
      end
    end

    def validate_secret_key_config! #:nodoc:
      if config.secret_key_base.blank? && config.secret_token.blank?
        raise "You must set config.secret_key_base in your app's config."
      end
    end
  end
end