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require 'rack'
require 'rack/request'
module Rack
class SSL
YEAR = 31536000
def self.default_hsts_options
{ :expires => YEAR, :subdomains => false }
end
def initialize(app, options = {})
@app = app
@hsts = options[:hsts]
@hsts = {} if @hsts.nil? || @hsts == true
@hsts = self.class.default_hsts_options.merge(@hsts) if @hsts
@exclude = options[:exclude]
@host = options[:host]
end
def call(env)
if @exclude && @exclude.call(env)
@app.call(env)
elsif scheme(env) == 'https'
status, headers, body = @app.call(env)
headers = hsts_headers.merge(headers)
flag_cookies_as_secure!(headers)
[status, headers, body]
else
redirect_to_https(env)
end
end
private
# Fixed in rack >= 1.3
def scheme(env)
if env['HTTPS'] == 'on'
'https'
elsif env['HTTP_X_FORWARDED_PROTO']
env['HTTP_X_FORWARDED_PROTO'].split(',')[0]
else
env['rack.url_scheme']
end
end
def redirect_to_https(env)
req = Request.new(env)
url = URI(req.url)
url.scheme = "https"
url.host = @host if @host
headers = hsts_headers.merge('Content-Type' => 'text/html',
'Location' => url.to_s)
[301, headers, []]
rescue URI::InvalidURIError
[404, {}, []]
end
# http://tools.ietf.org/html/draft-hodges-strict-transport-sec-02
def hsts_headers
if @hsts
value = "max-age=#{@hsts[:expires]}"
value += "; includeSubDomains" if @hsts[:subdomains]
{ 'Strict-Transport-Security' => value }
else
{}
end
end
def flag_cookies_as_secure!(headers)
if cookies = headers['Set-Cookie']
# Rack 1.1's set_cookie_header! will sometimes wrap
# Set-Cookie in an array
unless cookies.respond_to?(:to_ary)
cookies = cookies.split("\n")
end
headers['Set-Cookie'] = cookies.map { |cookie|
if cookie !~ /; secure(;|$)/
"#{cookie}; secure"
else
cookie
end
}.join("\n")
end
end
end
end
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