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