--- /dev/null
+module ActionController #:nodoc:
+ module Verification #:nodoc:
+ def self.included(base) #:nodoc:
+ base.extend(ClassMethods)
+ end
+
+ # This module provides a class-level method for specifying that certain
+ # actions are guarded against being called without certain prerequisites
+ # being met. This is essentially a special kind of before_filter.
+ #
+ # An action may be guarded against being invoked without certain request
+ # parameters being set, or without certain session values existing.
+ #
+ # When a verification is violated, values may be inserted into the flash, and
+ # a specified redirection is triggered. If no specific action is configured,
+ # verification failures will by default result in a 400 Bad Request response.
+ #
+ # Usage:
+ #
+ # class GlobalController < ActionController::Base
+ # # Prevent the #update_settings action from being invoked unless
+ # # the 'admin_privileges' request parameter exists. The
+ # # settings action will be redirected to in current controller
+ # # if verification fails.
+ # verify :params => "admin_privileges", :only => :update_post,
+ # :redirect_to => { :action => "settings" }
+ #
+ # # Disallow a post from being updated if there was no information
+ # # submitted with the post, and if there is no active post in the
+ # # session, and if there is no "note" key in the flash. The route
+ # # named category_url will be redirected to if verification fails.
+ #
+ # verify :params => "post", :session => "post", "flash" => "note",
+ # :only => :update_post,
+ # :add_flash => { "alert" => "Failed to create your message" },
+ # :redirect_to => :category_url
+ #
+ # Note that these prerequisites are not business rules. They do not examine
+ # the content of the session or the parameters. That level of validation should
+ # be encapsulated by your domain model or helper methods in the controller.
+ module ClassMethods
+ # Verify the given actions so that if certain prerequisites are not met,
+ # the user is redirected to a different action. The +options+ parameter
+ # is a hash consisting of the following key/value pairs:
+ #
+ # <tt>:params</tt>::
+ # a single key or an array of keys that must be in the <tt>params</tt>
+ # hash in order for the action(s) to be safely called.
+ # <tt>:session</tt>::
+ # a single key or an array of keys that must be in the <tt>session</tt>
+ # in order for the action(s) to be safely called.
+ # <tt>:flash</tt>::
+ # a single key or an array of keys that must be in the flash in order
+ # for the action(s) to be safely called.
+ # <tt>:method</tt>::
+ # a single key or an array of keys--any one of which must match the
+ # current request method in order for the action(s) to be safely called.
+ # (The key should be a symbol: <tt>:get</tt> or <tt>:post</tt>, for
+ # example.)
+ # <tt>:xhr</tt>::
+ # true/false option to ensure that the request is coming from an Ajax
+ # call or not.
+ # <tt>:add_flash</tt>::
+ # a hash of name/value pairs that should be merged into the session's
+ # flash if the prerequisites cannot be satisfied.
+ # <tt>:add_headers</tt>::
+ # a hash of name/value pairs that should be merged into the response's
+ # headers hash if the prerequisites cannot be satisfied.
+ # <tt>:redirect_to</tt>::
+ # the redirection parameters to be used when redirecting if the
+ # prerequisites cannot be satisfied. You can redirect either to named
+ # route or to the action in some controller.
+ # <tt>:render</tt>::
+ # the render parameters to be used when the prerequisites cannot be satisfied.
+ # <tt>:only</tt>::
+ # only apply this verification to the actions specified in the associated
+ # array (may also be a single value).
+ # <tt>:except</tt>::
+ # do not apply this verification to the actions specified in the associated
+ # array (may also be a single value).
+ def verify(options={})
+ before_filter :only => options[:only], :except => options[:except] do |c|
+ c.__send__ :verify_action, options
+ end
+ end
+ end
+
+ private
+
+ def verify_action(options) #:nodoc:
+ if prereqs_invalid?(options)
+ flash.update(options[:add_flash]) if options[:add_flash]
+ response.headers.update(options[:add_headers]) if options[:add_headers]
+ apply_remaining_actions(options) unless performed?
+ end
+ end
+
+ def prereqs_invalid?(options) # :nodoc:
+ verify_presence_of_keys_in_hash_flash_or_params(options) ||
+ verify_method(options) ||
+ verify_request_xhr_status(options)
+ end
+
+ def verify_presence_of_keys_in_hash_flash_or_params(options) # :nodoc:
+ [*options[:params] ].find { |v| params[v].nil? } ||
+ [*options[:session]].find { |v| session[v].nil? } ||
+ [*options[:flash] ].find { |v| flash[v].nil? }
+ end
+
+ def verify_method(options) # :nodoc:
+ [*options[:method]].all? { |v| request.method != v.to_sym } if options[:method]
+ end
+
+ def verify_request_xhr_status(options) # :nodoc:
+ request.xhr? != options[:xhr] unless options[:xhr].nil?
+ end
+
+ def apply_redirect_to(redirect_to_option) # :nodoc:
+ (redirect_to_option.is_a?(Symbol) && redirect_to_option != :back) ? self.__send__(redirect_to_option) : redirect_to_option
+ end
+
+ def apply_remaining_actions(options) # :nodoc:
+ case
+ when options[:render] ; render(options[:render])
+ when options[:redirect_to] ; redirect_to(apply_redirect_to(options[:redirect_to]))
+ else head(:bad_request)
+ end
+ end
+ end
+end
\ No newline at end of file
projects / depot.git / blobdiff