module ActionController class RedirectBackError < AbstractController::Error #:nodoc: DEFAULT_MESSAGE = 'No HTTP_REFERER was set in the request to this action, so redirect_to :back could not be called successfully. If this is a test, make sure to specify request.env["HTTP_REFERER"].' def initialize(message = nil) super(message || DEFAULT_MESSAGE) end end module Redirecting extend ActiveSupport::Concern include AbstractController::Logger # Redirects the browser to the target specified in +options+. This parameter can take one of three forms: # # * Hash - The URL will be generated by calling url_for with the +options+. # * Record - The URL will be generated by calling url_for with the +options+, which will reference a named URL for that record. # * String starting with protocol:// (like http://) - Is passed straight through as the target for redirection. # * String not containing a protocol - The current protocol and host is prepended to the string. # * :back - Back to the page that issued the request. Useful for forms that are triggered from multiple places. # Short-hand for redirect_to(request.env["HTTP_REFERER"]) # # Examples: # redirect_to :action => "show", :id => 5 # redirect_to post # redirect_to "http://www.rubyonrails.org" # redirect_to "/images/screenshot.jpg" # redirect_to articles_url # redirect_to :back # # The redirection happens as a "302 Moved" header unless otherwise specified. # # Examples: # redirect_to post_url(@post), :status => :found # redirect_to :action=>'atom', :status => :moved_permanently # redirect_to post_url(@post), :status => 301 # redirect_to :action=>'atom', :status => 302 # # It is also possible to assign a flash message as part of the redirection. There are two special accessors for commonly used the flash names # +alert+ and +notice+ as well as a general purpose +flash+ bucket. # # Examples: # redirect_to post_url(@post), :alert => "Watch it, mister!" # redirect_to post_url(@post), :status=> :found, :notice => "Pay attention to the road" # redirect_to post_url(@post), :status => 301, :flash => { :updated_post_id => @post.id } # redirect_to { :action=>'atom' }, :alert => "Something serious happened" # # When using redirect_to :back, if there is no referrer, # RedirectBackError will be raised. You may specify some fallback # behavior for this case by rescuing RedirectBackError. def redirect_to(options = {}, response_status = {}) #:doc: raise ActionControllerError.new("Cannot redirect to nil!") if options.nil? raise AbstractController::DoubleRenderError if response_body self.status = _extract_redirect_to_status(options, response_status) self.location = _compute_redirect_to_location(options) self.response_body = "
You are being redirected." logger.info("Redirected to #{location}") if logger && logger.info? end private def _extract_redirect_to_status(options, response_status) status = if options.is_a?(Hash) && options.key?(:status) ActionDispatch::StatusCodes[options.delete(:status)] elsif response_status.key?(:status) ActionDispatch::StatusCodes[response_status[:status]] else 302 end end def _compute_redirect_to_location(options) case options # The scheme name consist of a letter followed by any combination of # letters, digits, and the plus ("+"), period ("."), or hyphen ("-") # characters; and is terminated by a colon (":"). when %r{^\w[\w\d+.-]*:.*} options when String request.protocol + request.host_with_port + options when :back raise RedirectBackError unless refer = request.headers["Referer"] refer else url_for(options) end.gsub(/[\r\n]/, '') end end end