require 'active_support/core_ext/object/to_param'
require 'active_support/core_ext/regexp'
module ActionDispatch
# == Routing
#
# The routing module provides URL rewriting in native Ruby. It's a way to
# redirect incoming requests to controllers and actions. This replaces
# mod_rewrite rules. Best of all, Rails' Routing works with any web server.
# Routes are defined in <tt>config/routes.rb</tt>.
#
# Consider the following route, installed by Rails when you generate your
# application:
#
# map.connect ':controller/:action/:id'
#
# This route states that it expects requests to consist of a
# <tt>:controller</tt> followed by an <tt>:action</tt> that in turn is fed
# some <tt>:id</tt>.
#
# Suppose you get an incoming request for <tt>/blog/edit/22</tt>, you'll end up
# with:
#
# params = { :controller => 'blog',
# :action => 'edit',
# :id => '22'
# }
#
# Think of creating routes as drawing a map for your requests. The map tells
# them where to go based on some predefined pattern:
#
# ActionController::Routing::Routes.draw do |map|
# Pattern 1 tells some request to go to one place
# Pattern 2 tell them to go to another
# ...
# end
#
# The following symbols are special:
#
# :controller maps to your controller name
# :action maps to an action with your controllers
#
# Other names simply map to a parameter as in the case of <tt>:id</tt>.
#
# == Route priority
#
# Not all routes are created equally. Routes have priority defined by the
# order of appearance of the routes in the <tt>config/routes.rb</tt> file. The priority goes
# from top to bottom. The last route in that file is at the lowest priority
# and will be applied last. If no route matches, 404 is returned.
#
# Within blocks, the empty pattern is at the highest priority.
# In practice this works out nicely:
#
# ActionController::Routing::Routes.draw do |map|
# map.with_options :controller => 'blog' do |blog|
# blog.show '', :action => 'list'
# end
# map.connect ':controller/:action/:view'
# end
#
# In this case, invoking blog controller (with an URL like '/blog/')
# without parameters will activate the 'list' action by default.
#
# == Defaults routes and default parameters
#
# Setting a default route is straightforward in Rails - you simply append a
# Hash at the end of your mapping to set any default parameters.
#
# Example:
#
# ActionController::Routing:Routes.draw do |map|
# map.connect ':controller/:action/:id', :controller => 'blog'
# end
#
# This sets up +blog+ as the default controller if no other is specified.
# This means visiting '/' would invoke the blog controller.
#
# More formally, you can include arbitrary parameters in the route, thus:
#
# map.connect ':controller/:action/:id', :action => 'show', :page => 'Dashboard'
#
# This will pass the :page parameter to all incoming requests that match this route.
#
# Note: The default routes, as provided by the Rails generator, make all actions in every
# controller accessible via GET requests. You should consider removing them or commenting
# them out if you're using named routes and resources.
#
# == Named routes
#
# Routes can be named with the syntax <tt>map.name_of_route options</tt>,
# allowing for easy reference within your source as +name_of_route_url+
# for the full URL and +name_of_route_path+ for the URI path.
#
# Example:
#
# # In routes.rb
# map.login 'login', :controller => 'accounts', :action => 'login'
#
# # With render, redirect_to, tests, etc.
# redirect_to login_url
#
# Arguments can be passed as well.
#
# redirect_to show_item_path(:id => 25)
#
# Use <tt>map.root</tt> as a shorthand to name a route for the root path "".
#
# # In routes.rb
# map.root :controller => 'blogs'
#
# # would recognize http://www.example.com/ as
# params = { :controller => 'blogs', :action => 'index' }
#
# # and provide these named routes
# root_url # => 'http://www.example.com/'
# root_path # => ''
#
# You can also specify an already-defined named route in your <tt>map.root</tt> call:
#
# # In routes.rb
# map.new_session :controller => 'sessions', :action => 'new'
# map.root :new_session
#
# Note: when using +with_options+, the route is simply named after the
# method you call on the block parameter rather than map.
#
# # In routes.rb
# map.with_options :controller => 'blog' do |blog|
# blog.show '', :action => 'list'
# blog.delete 'delete/:id', :action => 'delete'
# blog.edit 'edit/:id', :action => 'edit'
# end
#
# # provides named routes for show, delete, and edit
# link_to @article.title, show_path(:id => @article.id)
#
# == Pretty URLs
#
# Routes can generate pretty URLs. For example:
#
# map.connect 'articles/:year/:month/:day',
# :controller => 'articles',
# :action => 'find_by_date',
# :year => /\d{4}/,
# :month => /\d{1,2}/,
# :day => /\d{1,2}/
#
# Using the route above, the URL "http://localhost:3000/articles/2005/11/06"
# maps to
#
# params = {:year => '2005', :month => '11', :day => '06'}
#
# == Regular Expressions and parameters
# You can specify a regular expression to define a format for a parameter.
#
# map.geocode 'geocode/:postalcode', :controller => 'geocode',
# :action => 'show', :postalcode => /\d{5}(-\d{4})?/
#
# or, more formally:
#
# map.geocode 'geocode/:postalcode', :controller => 'geocode',
# :action => 'show', :requirements => { :postalcode => /\d{5}(-\d{4})?/ }
#
# Formats can include the 'ignorecase' and 'extended syntax' regular
# expression modifiers:
#
# map.geocode 'geocode/:postalcode', :controller => 'geocode',
# :action => 'show', :postalcode => /hx\d\d\s\d[a-z]{2}/i
#
# map.geocode 'geocode/:postalcode', :controller => 'geocode',
# :action => 'show',:requirements => {
# :postalcode => /# Postcode format
# \d{5} #Prefix
# (-\d{4})? #Suffix
# /x
# }
#
# Using the multiline match modifier will raise an ArgumentError.
# Encoding regular expression modifiers are silently ignored. The
# match will always use the default encoding or ASCII.
#
# == Route globbing
#
# Specifying <tt>*[string]</tt> as part of a rule like:
#
# map.connect '*path' , :controller => 'blog' , :action => 'unrecognized?'
#
# will glob all remaining parts of the route that were not recognized earlier.
# The globbed values are in <tt>params[:path]</tt> as an array of path segments.
#
# == Route conditions
#
# With conditions you can define restrictions on routes. Currently the only valid condition is <tt>:method</tt>.
#
# * <tt>:method</tt> - Allows you to specify which HTTP method(s) can access the route. Possible values are
# <tt>:post</tt>, <tt>:get</tt>, <tt>:put</tt>, <tt>:delete</tt> and <tt>:any</tt>. Use an array to specify more
# than one method, e.g. <tt>[ :get, :post ]</tt>. The default value is <tt>:any</tt>, <tt>:any</tt> means that any
# method can access the route.
#
# Example:
#
# map.connect 'post/:id', :controller => 'posts', :action => 'show',
# :conditions => { :method => :get }
# map.connect 'post/:id', :controller => 'posts', :action => 'create_comment',
# :conditions => { :method => :post }
#
# Now, if you POST to <tt>/posts/:id</tt>, it will route to the <tt>create_comment</tt> action. A GET on the same
# URL will route to the <tt>show</tt> action.
#
# == Reloading routes
#
# You can reload routes if you feel you must:
#
# ActionController::Routing::Routes.reload
#
# This will clear all named routes and reload routes.rb if the file has been modified from
# last load. To absolutely force reloading, use <tt>reload!</tt>.
#
# == Testing Routes
#
# The two main methods for testing your routes:
#
# === +assert_routing+
#
# def test_movie_route_properly_splits
# opts = {:controller => "plugin", :action => "checkout", :id => "2"}
# assert_routing "plugin/checkout/2", opts
# end
#
# +assert_routing+ lets you test whether or not the route properly resolves into options.
#
# === +assert_recognizes+
#
# def test_route_has_options
# opts = {:controller => "plugin", :action => "show", :id => "12"}
# assert_recognizes opts, "/plugins/show/12"
# end
#
# Note the subtle difference between the two: +assert_routing+ tests that
# a URL fits options while +assert_recognizes+ tests that a URL
# breaks into parameters properly.
#
# In tests you can simply pass the URL or named route to +get+ or +post+.
#
# def send_to_jail
# get '/jail'
# assert_response :success
# assert_template "jail/front"
# end
#
# def goes_to_login
# get login_url
# #...
# end
#
# == View a list of all your routes
#
# Run <tt>rake routes</tt>.
#
module Routing
autoload :DeprecatedMapper, 'action_dispatch/routing/deprecated_mapper'
autoload :Mapper, 'action_dispatch/routing/mapper'
autoload :Route, 'action_dispatch/routing/route'
autoload :RouteSet, 'action_dispatch/routing/route_set'
SEPARATORS = %w( / . ? )
HTTP_METHODS = [:get, :head, :post, :put, :delete, :options]
ALLOWED_REQUIREMENTS_FOR_OPTIMISATION = [:controller, :action].to_set
# The root paths which may contain controller files
mattr_accessor :controller_paths
self.controller_paths = []
# A helper module to hold URL related helpers.
module Helpers
include ActionController::PolymorphicRoutes
end
class << self
# Expects an array of controller names as the first argument.
# Executes the passed block with only the named controllers named available.
# This method is used in internal Rails testing.
def with_controllers(names)
prior_controllers = @possible_controllers
use_controllers! names
yield
ensure
use_controllers! prior_controllers
end
# Returns an array of paths, cleaned of double-slashes and relative path references.
# * "\\\" and "//" become "\\" or "/".
# * "/foo/bar/../config" becomes "/foo/config".
# The returned array is sorted by length, descending.
def normalize_paths(paths)
# do the hokey-pokey of path normalization...
paths = paths.collect do |path|
path = path.
gsub("//", "/"). # replace double / chars with a single
gsub("\\\\", "\\"). # replace double \ chars with a single
gsub(%r{(.)[\\/]$}, '\1') # drop final / or \ if path ends with it
# eliminate .. paths where possible
re = %r{[^/\\]+[/\\]\.\.[/\\]}
path.gsub!(re, "") while path.match(re)
path
end
# start with longest path, first
paths = paths.uniq.sort_by { |path| - path.length }
end
# Returns the array of controller names currently available to ActionController::Routing.
def possible_controllers
unless @possible_controllers
@possible_controllers = []
paths = controller_paths.select { |path| File.directory?(path) && path != "." }
seen_paths = Hash.new {|h, k| h[k] = true; false}
normalize_paths(paths).each do |load_path|
Dir["#{load_path}/**/*_controller.rb"].collect do |path|
next if seen_paths[path.gsub(%r{^\.[/\\]}, "")]
controller_name = path[(load_path.length + 1)..-1]
controller_name.gsub!(/_controller\.rb\Z/, '')
@possible_controllers << controller_name
end
end
# remove duplicates
@possible_controllers.uniq!
end
@possible_controllers
end
# Replaces the internal list of controllers available to ActionController::Routing with the passed argument.
# ActionController::Routing.use_controllers!([ "posts", "comments", "admin/comments" ])
def use_controllers!(controller_names)
@possible_controllers = controller_names
end
# Returns a controller path for a new +controller+ based on a +previous+ controller path.
# Handles 4 scenarios:
#
# * stay in the previous controller:
# controller_relative_to( nil, "groups/discussion" ) # => "groups/discussion"
#
# * stay in the previous namespace:
# controller_relative_to( "posts", "groups/discussion" ) # => "groups/posts"
#
# * forced move to the root namespace:
# controller_relative_to( "/posts", "groups/discussion" ) # => "posts"
#
# * previous namespace is root:
# controller_relative_to( "posts", "anything_with_no_slashes" ) # =>"posts"
#
def controller_relative_to(controller, previous)
if controller.nil? then previous
elsif controller[0] == ?/ then controller[1..-1]
elsif %r{^(.*)/} =~ previous then "#{$1}/#{controller}"
else controller
end
end
end
ActiveSupport::Inflector.module_eval do
# Ensures that routes are reloaded when Rails inflections are updated.
def inflections_with_route_reloading(&block)
returning(inflections_without_route_reloading(&block)) {
ActionDispatch::Routing::Routes.reload! if block_given?
}
end
alias_method_chain :inflections, :route_reloading
end
end
end
