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module ActionController
# Rewrites URLs for Base.redirect_to and Base.url_for in the controller.
class UrlRewriter #:nodoc:
VALID_OPTIONS = [:action, :action_prefix, :action_suffix, :application_prefix, :module, :controller, :controller_prefix, :anchor, :params, :path_params, :id, :only_path, :overwrite_params, :host, :protocol ]
def initialize(request, controller, action)
@request, @controller, @action = request, controller, action
@rewritten_path = @request.path ? @request.path.dup : ""
end
def rewrite(options = {})
validate_options(VALID_OPTIONS, options.keys)
rewrite_url(
rewrite_path(@rewritten_path, resolve_aliases(options)),
options
)
end
def to_s
to_str
end
def to_str
"#{@request.protocol}, #{@request.host_with_port}, #{@request.path}, #{@controller}, #{@action}, #{@request.parameters.inspect}"
end
private
def validate_options(valid_option_keys, supplied_option_keys)
unknown_option_keys = supplied_option_keys - valid_option_keys
raise(ActionController::ActionControllerError, "Unknown options: #{unknown_option_keys}") unless unknown_option_keys.empty?
end
def resolve_aliases(options)
options[:controller_prefix] = options[:module] unless options[:module].nil?
options
end
def rewrite_url(path, options)
rewritten_url = ""
rewritten_url << (options[:protocol] || @request.protocol) unless options[:only_path]
rewritten_url << (options[:host] || @request.host_with_port) unless options[:only_path]
rewritten_url << options[:application_prefix] if options[:application_prefix]
rewritten_url << path
rewritten_url << build_query_string(new_parameters(options)) if options[:params] || options[:overwrite_params]
rewritten_url << "##{options[:anchor]}" if options[:anchor]
return rewritten_url
end
def rewrite_path(path, options)
include_id_in_path_params(options)
path = rewrite_action(path, options) if options[:action] || options[:action_prefix]
path = rewrite_path_params(path, options) if options[:path_params]
path = rewrite_controller(path, options) if options[:controller] || options[:controller_prefix]
return path
end
def rewrite_path_params(path, options)
index_action = options[:action] == 'index' || options[:action].nil? && @action == 'index'
id_only = options[:path_params].size == 1 && options[:path_params]['id']
if index_action && id_only
path += '/' unless path[-1..-1] == '/'
path += "index/#{options[:path_params]['id']}"
path
else
options[:path_params].inject(path) do |path, pair|
if options[:action].nil? && @request.parameters[pair.first]
path.sub(/\b#{@request.parameters[pair.first]}\b/, pair.last.to_s)
else
path += "/#{pair.last}"
end
end
end
end
def rewrite_action(path, options)
# This regex assumes that "index" actions won't be included in the URL
all, controller_prefix, action_prefix, action_suffix =
/^\/(.*)#{@controller}\/(.*)#{@action == "index" ? "" : @action}(.*)/.match(path).to_a
if @action == "index"
if action_prefix == "index"
# we broke the parsing assumption that this would be excluded, so
# don't tell action_name about our little boo-boo
path = path.sub(action_prefix, action_name(options, nil))
elsif action_prefix && !action_prefix.empty?
path = path.sub(%r(/#{action_prefix}/?), "/" + action_name(options, action_prefix))
else
path = path.sub(%r(#{@controller}/?$), @controller + "/" + action_name(options)) # " ruby-mode
end
else
path = path.sub(
@controller + "/" + (action_prefix || "") + @action + (action_suffix || ""),
@controller + "/" + action_name(options, action_prefix)
)
end
if options[:controller_prefix] && !options[:controller]
ensure_slash_suffix(options, :controller_prefix)
if controller_prefix
path = path.sub(controller_prefix, options[:controller_prefix])
else
path = options[:controller_prefix] + path
end
end
return path
end
def rewrite_controller(path, options)
all, controller_prefix = /^\/(.*?)#{@controller}/.match(path).to_a
path = "/"
path << controller_name(options, controller_prefix)
path << action_name(options) if options[:action]
path << path_params_in_list(options) if options[:path_params]
return path
end
def action_name(options, action_prefix = nil, action_suffix = nil)
ensure_slash_suffix(options, :action_prefix)
ensure_slash_prefix(options, :action_suffix)
prefix = options[:action_prefix] || action_prefix || ""
suffix = options[:action] == "index" ? "" : (options[:action_suffix] || action_suffix || "")
name = (options[:action] == "index" ? "" : options[:action]) || ""
return prefix + name + suffix
end
def controller_name(options, controller_prefix)
ensure_slash_suffix(options, :controller_prefix)
controller_name = case options[:controller_prefix]
when String: options[:controller_prefix]
when false : ""
when nil : controller_prefix || ""
end
controller_name << (options[:controller] + "/") if options[:controller]
return controller_name
end
def path_params_in_list(options)
options[:path_params].inject("") { |path, pair| path += "/#{pair.last}" }
end
def ensure_slash_suffix(options, key)
options[key] = options[key] + "/" if options[key] && !options[key].empty? && options[key][-1..-1] != "/"
end
def ensure_slash_prefix(options, key)
options[key] = "/" + options[key] if options[key] && !options[key].empty? && options[key][0..1] != "/"
end
def include_id_in_path_params(options)
options[:path_params] = (options[:path_params] || {}).merge({"id" => options[:id]}) if options[:id]
end
def new_parameters(options)
parameters = options[:params] || existing_parameters
parameters.update(options[:overwrite_params]) if options[:overwrite_params]
parameters.reject { |key,value| value.nil? }
end
def existing_parameters
@request.parameters.reject { |key, value| %w( id action controller).include?(key) }
end
# Returns a query string with escaped keys and values from the passed hash. If the passed hash contains an "id" it'll
# be added as a path element instead of a regular parameter pair.
def build_query_string(hash)
elements = []
query_string = ""
hash.each do |key, value|
key = CGI.escape key
key += '[]' if value.class == Array
value = [ value ] unless value.class == Array
value.each { |val| elements << "#{key}=#{CGI.escape(val.to_s)}" }
end
unless elements.empty? then query_string << ("?" + elements.join("&")) end
return query_string
end
end
end
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