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redirection.rb
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redirection.rb
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require 'action_dispatch/http/request'
require 'active_support/core_ext/uri'
require 'active_support/core_ext/array/extract_options'
require 'rack/utils'
require 'action_controller/metal/exceptions'
require 'action_dispatch/routing/endpoint'
module ActionDispatch
module Routing
class Redirect < Endpoint # :nodoc:
attr_reader :status, :block
def initialize(status, block)
@status = status
@block = block
end
def redirect?; true; end
def call(env)
serve Request.new env
end
def serve(req)
req.check_path_parameters!
uri = URI.parse(path(req.path_parameters, req))
unless uri.host
if relative_path?(uri.path)
uri.path = "#{req.script_name}/#{uri.path}"
elsif uri.path.empty?
uri.path = req.script_name.empty? ? "/" : req.script_name
end
end
uri.scheme ||= req.scheme
uri.host ||= req.host
uri.port ||= req.port unless req.standard_port?
body = %(<html><body>You are being <a href="#{ERB::Util.h(uri.to_s)}">redirected</a>.</body></html>)
headers = {
'Location' => uri.to_s,
'Content-Type' => 'text/html',
'Content-Length' => body.length.to_s
}
[ status, headers, [body] ]
end
def path(params, request)
block.call params, request
end
def inspect
"redirect(#{status})"
end
private
def relative_path?(path)
path && !path.empty? && path[0] != '/'
end
def escape(params)
Hash[params.map{ |k,v| [k, Rack::Utils.escape(v)] }]
end
def escape_fragment(params)
Hash[params.map{ |k,v| [k, Journey::Router::Utils.escape_fragment(v)] }]
end
def escape_path(params)
Hash[params.map{ |k,v| [k, Journey::Router::Utils.escape_path(v)] }]
end
end
class PathRedirect < Redirect
URL_PARTS = /\A([^?]+)?(\?[^#]+)?(#.+)?\z/
def path(params, request)
if block.match(URL_PARTS)
path = interpolation_required?($1, params) ? $1 % escape_path(params) : $1
query = interpolation_required?($2, params) ? $2 % escape(params) : $2
fragment = interpolation_required?($3, params) ? $3 % escape_fragment(params) : $3
"#{path}#{query}#{fragment}"
else
interpolation_required?(block, params) ? block % escape(params) : block
end
end
def inspect
"redirect(#{status}, #{block})"
end
private
def interpolation_required?(string, params)
!params.empty? && string && string.match(/%\{\w*\}/)
end
end
class OptionRedirect < Redirect # :nodoc:
alias :options :block
def path(params, request)
url_options = {
:protocol => request.protocol,
:host => request.host,
:port => request.optional_port,
:path => request.path,
:params => request.query_parameters
}.merge! options
if !params.empty? && url_options[:path].match(/%\{\w*\}/)
url_options[:path] = (url_options[:path] % escape_path(params))
end
unless options[:host] || options[:domain]
if relative_path?(url_options[:path])
url_options[:path] = "/#{url_options[:path]}"
url_options[:script_name] = request.script_name
elsif url_options[:path].empty?
url_options[:path] = request.script_name.empty? ? "/" : ""
url_options[:script_name] = request.script_name
end
end
ActionDispatch::Http::URL.url_for url_options
end
def inspect
"redirect(#{status}, #{options.map{ |k,v| "#{k}: #{v}" }.join(', ')})"
end
end
module Redirection
# Redirect any path to another path:
#
# get "/stories" => redirect("/posts")
#
# You can also use interpolation in the supplied redirect argument:
#
# get 'docs/:article', to: redirect('/wiki/%{article}')
#
# Note that if you return a path without a leading slash then the url is prefixed with the
# current SCRIPT_NAME environment variable. This is typically '/' but may be different in
# a mounted engine or where the application is deployed to a subdirectory of a website.
#
# Alternatively you can use one of the other syntaxes:
#
# The block version of redirect allows for the easy encapsulation of any logic associated with
# the redirect in question. Either the params and request are supplied as arguments, or just
# params, depending of how many arguments your block accepts. A string is required as a
# return value.
#
# get 'jokes/:number', to: redirect { |params, request|
# path = (params[:number].to_i.even? ? "wheres-the-beef" : "i-love-lamp")
# "http://#{request.host_with_port}/#{path}"
# }
#
# Note that the +do end+ syntax for the redirect block wouldn't work, as Ruby would pass
# the block to +get+ instead of +redirect+. Use <tt>{ ... }</tt> instead.
#
# The options version of redirect allows you to supply only the parts of the url which need
# to change, it also supports interpolation of the path similar to the first example.
#
# get 'stores/:name', to: redirect(subdomain: 'stores', path: '/%{name}')
# get 'stores/:name(*all)', to: redirect(subdomain: 'stores', path: '/%{name}%{all}')
#
# Finally, an object which responds to call can be supplied to redirect, allowing you to reuse
# common redirect routes. The call method must accept two arguments, params and request, and return
# a string.
#
# get 'accounts/:name' => redirect(SubdomainRedirector.new('api'))
#
def redirect(*args, &block)
options = args.extract_options!
status = options.delete(:status) || 301
path = args.shift
return OptionRedirect.new(status, options) if options.any?
return PathRedirect.new(status, path) if String === path
block = path if path.respond_to? :call
raise ArgumentError, "redirection argument not supported" unless block
Redirect.new status, block
end
end
end
end