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