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module ActionController #:nodoc:
# 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.
#
# Usage:
#
# class GlobalController < ActionController::Base
# # prevent the #update_settings action from being invoked unless
# # the 'admin_privileges' request parameter exists.
# 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.
# verify :params => "post", :session => "post", "flash" => "note",
# :only => :update_post,
# :add_flash => { "alert" => "Failed to create your message" },
# :redirect_to => :category_url
#
module Verification
def self.append_features(base) #:nodoc:
super
base.extend(ClassMethods)
end
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 @params 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 @session 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>: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>:redirect_to</tt>: the redirection parameters to be used when
# redirecting if 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={})
filter_opts = { :only => options[:only], :except => options[:except] }
before_filter(filter_opts) do |c|
c.send :verify_action, options
end
end
end
def verify_action(options) #:nodoc:
prereqs_invalid =
[*options[:params] ].find { |v| @params[v].nil? } ||
[*options[:session]].find { |v| @session[v].nil? } ||
[*options[:flash] ].find { |v| flash[v].nil? }
if !prereqs_invalid && options[:method]
prereqs_invalid ||=
[*options[:method]].all? { |v| @request.method != v.to_sym }
end
if prereqs_invalid
flash.update(options[:add_flash]) if options[:add_flash]
redirect_to(options[:redirect_to])
return false
end
true
end
private :verify_action
end
end
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