257 lines
9.2 KiB
Ruby
257 lines
9.2 KiB
Ruby
require "abstract_controller/error"
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require "active_support/configurable"
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require "active_support/descendants_tracker"
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require "active_support/core_ext/module/anonymous"
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require "active_support/core_ext/module/attr_internal"
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module AbstractController
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# Raised when a non-existing controller action is triggered.
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class ActionNotFound < StandardError
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end
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# AbstractController::Base is a low-level API. Nobody should be
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# using it directly, and subclasses (like ActionController::Base) are
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# expected to provide their own +render+ method, since rendering means
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# different things depending on the context.
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class Base
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attr_internal :response_body
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attr_internal :action_name
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attr_internal :formats
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include ActiveSupport::Configurable
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extend ActiveSupport::DescendantsTracker
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class << self
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attr_reader :abstract
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alias_method :abstract?, :abstract
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# Define a controller as abstract. See internal_methods for more
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# details.
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def abstract!
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@abstract = true
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end
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def inherited(klass) # :nodoc:
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# Define the abstract ivar on subclasses so that we don't get
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# uninitialized ivar warnings
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unless klass.instance_variable_defined?(:@abstract)
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klass.instance_variable_set(:@abstract, false)
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end
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super
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end
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# A list of all internal methods for a controller. This finds the first
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# abstract superclass of a controller, and gets a list of all public
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# instance methods on that abstract class. Public instance methods of
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# a controller would normally be considered action methods, so methods
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# declared on abstract classes are being removed.
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# (<tt>ActionController::Metal</tt> and ActionController::Base are defined as abstract)
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def internal_methods
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controller = self
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controller = controller.superclass until controller.abstract?
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controller.public_instance_methods(true)
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end
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# A list of method names that should be considered actions. This
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# includes all public instance methods on a controller, less
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# any internal methods (see internal_methods), adding back in
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# any methods that are internal, but still exist on the class
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# itself.
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#
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# ==== Returns
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# * <tt>Set</tt> - A set of all methods that should be considered actions.
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def action_methods
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@action_methods ||= begin
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# All public instance methods of this class, including ancestors
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methods = (public_instance_methods(true) -
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# Except for public instance methods of Base and its ancestors
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internal_methods +
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# Be sure to include shadowed public instance methods of this class
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public_instance_methods(false)).uniq.map(&:to_s)
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methods.to_set
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end
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end
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# action_methods are cached and there is sometimes a need to refresh
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# them. ::clear_action_methods! allows you to do that, so next time
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# you run action_methods, they will be recalculated.
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def clear_action_methods!
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@action_methods = nil
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end
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# Returns the full controller name, underscored, without the ending Controller.
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#
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# class MyApp::MyPostsController < AbstractController::Base
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#
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# end
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#
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# MyApp::MyPostsController.controller_path # => "my_app/my_posts"
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#
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# ==== Returns
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# * <tt>String</tt>
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def controller_path
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@controller_path ||= name.sub(/Controller$/, "".freeze).underscore unless anonymous?
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end
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# Refresh the cached action_methods when a new action_method is added.
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def method_added(name)
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super
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clear_action_methods!
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end
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end
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abstract!
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# Calls the action going through the entire action dispatch stack.
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#
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# The actual method that is called is determined by calling
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# #method_for_action. If no method can handle the action, then an
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# AbstractController::ActionNotFound error is raised.
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#
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# ==== Returns
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# * <tt>self</tt>
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def process(action, *args)
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@_action_name = action.to_s
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unless action_name = _find_action_name(@_action_name)
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raise ActionNotFound, "The action '#{action}' could not be found for #{self.class.name}"
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end
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@_response_body = nil
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process_action(action_name, *args)
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end
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# Delegates to the class' ::controller_path
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def controller_path
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self.class.controller_path
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end
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# Delegates to the class' ::action_methods
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def action_methods
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self.class.action_methods
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end
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# Returns true if a method for the action is available and
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# can be dispatched, false otherwise.
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#
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# Notice that <tt>action_methods.include?("foo")</tt> may return
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# false and <tt>available_action?("foo")</tt> returns true because
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# this method considers actions that are also available
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# through other means, for example, implicit render ones.
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#
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# ==== Parameters
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# * <tt>action_name</tt> - The name of an action to be tested
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def available_action?(action_name)
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_find_action_name(action_name)
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end
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# Tests if a response body is set. Used to determine if the
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# +process_action+ callback needs to be terminated in
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# +AbstractController::Callbacks+.
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def performed?
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response_body
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end
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# Returns true if the given controller is capable of rendering
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# a path. A subclass of +AbstractController::Base+
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# may return false. An Email controller for example does not
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# support paths, only full URLs.
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def self.supports_path?
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true
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end
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private
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# Returns true if the name can be considered an action because
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# it has a method defined in the controller.
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#
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# ==== Parameters
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# * <tt>name</tt> - The name of an action to be tested
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#
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# :api: private
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def action_method?(name)
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self.class.action_methods.include?(name)
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end
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# Call the action. Override this in a subclass to modify the
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# behavior around processing an action. This, and not #process,
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# is the intended way to override action dispatching.
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#
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# Notice that the first argument is the method to be dispatched
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# which is *not* necessarily the same as the action name.
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def process_action(method_name, *args)
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send_action(method_name, *args)
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end
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# Actually call the method associated with the action. Override
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# this method if you wish to change how action methods are called,
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# not to add additional behavior around it. For example, you would
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# override #send_action if you want to inject arguments into the
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# method.
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alias send_action send
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# If the action name was not found, but a method called "action_missing"
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# was found, #method_for_action will return "_handle_action_missing".
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# This method calls #action_missing with the current action name.
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def _handle_action_missing(*args)
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action_missing(@_action_name, *args)
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end
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# Takes an action name and returns the name of the method that will
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# handle the action.
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#
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# It checks if the action name is valid and returns false otherwise.
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#
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# See method_for_action for more information.
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#
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# ==== Parameters
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# * <tt>action_name</tt> - An action name to find a method name for
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#
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# ==== Returns
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# * <tt>string</tt> - The name of the method that handles the action
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# * false - No valid method name could be found.
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# Raise +AbstractController::ActionNotFound+.
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def _find_action_name(action_name)
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_valid_action_name?(action_name) && method_for_action(action_name)
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end
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# Takes an action name and returns the name of the method that will
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# handle the action. In normal cases, this method returns the same
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# name as it receives. By default, if #method_for_action receives
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# a name that is not an action, it will look for an #action_missing
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# method and return "_handle_action_missing" if one is found.
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#
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# Subclasses may override this method to add additional conditions
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# that should be considered an action. For instance, an HTTP controller
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# with a template matching the action name is considered to exist.
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#
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# If you override this method to handle additional cases, you may
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# also provide a method (like +_handle_method_missing+) to handle
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# the case.
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#
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# If none of these conditions are true, and +method_for_action+
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# returns +nil+, an +AbstractController::ActionNotFound+ exception will be raised.
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#
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# ==== Parameters
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# * <tt>action_name</tt> - An action name to find a method name for
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#
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# ==== Returns
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# * <tt>string</tt> - The name of the method that handles the action
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# * <tt>nil</tt> - No method name could be found.
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def method_for_action(action_name)
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if action_method?(action_name)
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action_name
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elsif respond_to?(:action_missing, true)
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"_handle_action_missing"
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end
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end
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# Checks if the action name is valid and returns false otherwise.
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def _valid_action_name?(action_name)
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!action_name.to_s.include? File::SEPARATOR
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end
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end
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end
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