/usr/lib/ruby/vendor_ruby/rack/rewrite/rule.rb is in ruby-rack-rewrite 1.3.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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module Rack
class Rewrite
class RuleSet
attr_reader :rules
def initialize #:nodoc:
@rules = []
end
protected
# We're explicitly defining private functions for our DSL rather than
# using method_missing
# Creates a rewrite rule that will simply rewrite the REQUEST_URI,
# PATH_INFO, and QUERY_STRING headers of the Rack environment. The
# user's browser will continue to show the initially requested URL.
#
# rewrite '/wiki/John_Trupiano', '/john'
# rewrite %r{/wiki/(\w+)_\w+}, '/$1'
# rewrite %r{(.*)}, '/maintenance.html', :if => lambda { File.exists?('maintenance.html') }
def rewrite(*args)
add_rule :rewrite, *args
end
# Creates a redirect rule that will send a 301 when matching.
#
# r301 '/wiki/John_Trupiano', '/john'
# r301 '/contact-us.php', '/contact-us'
#
# You can use +moved_permanently+ or just +p+ instead of +r301+.
def r301(*args)
add_rule :r301, *args
end
alias :moved_permanently :r301
alias :p :r301
# Creates a redirect rule that will send a 302 when matching.
#
# r302 '/wiki/John_Trupiano', '/john'
# r302 '/wiki/(.*)', 'http://www.google.com/?q=$1'
#
# You can use +found+ instead of +r302+.
def r302(*args)
add_rule :r302, *args
end
alias :found :r302
# Creates a redirect rule that will send a 303 when matching.
#
# r303 '/wiki/John_Trupiano', '/john'
# r303 '/wiki/(.*)', 'http://www.google.com/?q=$1'
#
# You can use +see_other+ instead of +r303+.
def r303(*args)
add_rule :r303, *args
end
alias :see_other :r303
# Creates a redirect rule that will send a 307 when matching.
#
# r307 '/wiki/John_Trupiano', '/john'
# r307 '/wiki/(.*)', 'http://www.google.com/?q=$1'
#
# You can use +temporary_redirect+ or +t+ instead of +r307+.
def r307(*args)
add_rule :r307, *args
end
alias :temporary_redirect :r307
alias :t :r307
# Creates a rule that will render a file if matched.
#
# send_file /*/, 'public/system/maintenance.html',
# :if => Proc.new { File.exists?('public/system/maintenance.html') }
def send_file(*args)
add_rule :send_file, *args
end
# Creates a rule that will render a file using x-send-file
# if matched.
#
# x_send_file /*/, 'public/system/maintenance.html',
# :if => Proc.new { File.exists?('public/system/maintenance.html') }
def x_send_file(*args)
add_rule :x_send_file, *args
end
private
def add_rule(method, from, to, options = {}) #:nodoc:
@rules << Rule.new(method.to_sym, from, to, options)
end
end
# TODO: Break rules into subclasses
class Rule #:nodoc:
attr_reader :rule_type, :from, :to, :options
def initialize(rule_type, from, to, options={}) #:nodoc:
@rule_type, @from, @to, @options = rule_type, from, to, normalize_options(options)
end
def matches?(rack_env) #:nodoc:
return false if options[:if].respond_to?(:call) && !options[:if].call(rack_env)
path = build_path_from_env(rack_env)
self.match_options?(rack_env) && string_matches?(path, self.from)
end
# Either (a) return a Rack response (short-circuiting the Rack stack), or
# (b) alter env as necessary and return true
def apply!(env) #:nodoc:
interpreted_to = self.interpret_to(env)
additional_headers = {}
if @options[:headers]
if @options[:headers].respond_to?(:call)
additional_headers = @options[:headers].call || {}
else
additional_headers = @options[:headers] || {}
end
end
status = @options[:status] || 200
case self.rule_type
when :r301
[301, {'Location' => interpreted_to, 'Content-Type' => Rack::Mime.mime_type(::File.extname(interpreted_to))}.merge!(additional_headers), [redirect_message(interpreted_to)]]
when :r302
[302, {'Location' => interpreted_to, 'Content-Type' => Rack::Mime.mime_type(::File.extname(interpreted_to))}.merge!(additional_headers), [redirect_message(interpreted_to)]]
when :r303
[303, {'Location' => interpreted_to, 'Content-Type' => Rack::Mime.mime_type(::File.extname(interpreted_to))}.merge!(additional_headers), [redirect_message(interpreted_to)]]
when :r307
[307, {'Location' => interpreted_to, 'Content-Type' => Rack::Mime.mime_type(::File.extname(interpreted_to))}.merge!(additional_headers), [redirect_message(interpreted_to)]]
when :rewrite
# return [200, {}, {:content => env.inspect}]
env['REQUEST_URI'] = interpreted_to
if q_index = interpreted_to.index('?')
env['PATH_INFO'] = interpreted_to[0..q_index-1]
env['QUERY_STRING'] = interpreted_to[q_index+1..interpreted_to.size-1]
else
env['PATH_INFO'] = interpreted_to
env['QUERY_STRING'] = ''
end
true
when :send_file
[status, {
'Content-Length' => ::File.size(interpreted_to).to_s,
'Content-Type' => Rack::Mime.mime_type(::File.extname(interpreted_to))
}.merge!(additional_headers), [::File.read(interpreted_to)]]
when :x_send_file
[status, {
'X-Sendfile' => interpreted_to,
'Content-Length' => ::File.size(interpreted_to).to_s,
'Content-Type' => Rack::Mime.mime_type(::File.extname(interpreted_to))
}.merge!(additional_headers), []]
else
raise Exception.new("Unsupported rule: #{self.rule_type}")
end
end
protected
def interpret_to(env) #:nodoc:
path = build_path_from_env(env)
return interpret_to_proc(path, env) if self.to.is_a?(Proc)
return computed_to(path) if compute_to?(path)
self.to
end
def is_a_regexp?(obj)
obj.is_a?(Regexp) || (Object.const_defined?(:Oniguruma) && obj.is_a?(Oniguruma::ORegexp))
end
def match_options?(env, path = build_path_from_env(env))
matches = []
request = Rack::Request.new(env)
# negative matches
matches << !string_matches?(path, options[:not]) if options[:not]
# possitive matches
matches << string_matches?(env['REQUEST_METHOD'], options[:method]) if options[:method]
matches << string_matches?(request.host, options[:host]) if options[:host]
matches << string_matches?(request.scheme, options[:scheme]) if options[:scheme]
matches.all?
end
private
def normalize_options(arg)
options = arg.respond_to?(:call) ? {:if => arg} : arg
options.symbolize_keys! if options.respond_to? :symbolize_keys!
options.freeze
end
def interpret_to_proc(path, env)
return self.to.call(match(path), env) if self.from.is_a?(Regexp)
self.to.call(self.from, env)
end
def compute_to?(path)
self.is_a_regexp?(from) && match(path)
end
def match(path)
self.from.match(path)
end
def string_matches?(string, matcher)
if self.is_a_regexp?(matcher)
string =~ matcher
elsif matcher.is_a?(String)
string == matcher
elsif matcher.is_a?(Symbol)
string.downcase == matcher.to_s.downcase
else
false
end
end
def computed_to(path)
# is there a better way to do this?
computed_to = self.to.dup
computed_to.gsub!("$&",match(path).to_s)
(match(path).size - 1).downto(1) do |num|
computed_to.gsub!("$#{num}", match(path)[num].to_s)
end
return computed_to
end
# Construct the URL (without domain) from PATH_INFO and QUERY_STRING
def build_path_from_env(env)
path = env['PATH_INFO'] || ''
path += "?#{env['QUERY_STRING']}" unless env['QUERY_STRING'].nil? || env['QUERY_STRING'].empty?
path
end
def redirect_message(location)
%Q(Redirecting to <a href="#{location}">#{location}</a>)
end
end
end
end
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