>   http://rack.rubyforge.org/doc/Rack/Auth/Digest/MD5.html

> The only I've found until now is a similar question with no response:

>   http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/313893

> El Viernes, 16 de Octubre de 2009, Iñaki Baz Castillo escribió:
>> Hi, could I get an example of Rack::Auth::Digest::MD5 usage? By reading the
>> doc I get confussed:

>>   http://rack.rubyforge.org/doc/Rack/Auth/Digest/MD5.html

>> The only I've found until now is a similar question with no response:

>>   http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/313893

> Any help please? I don't get it working and I don't know exactly what to try
> since there is no documentation or examples.

> Thanks.

> --
> Iñaki Baz Castillo <i...@aliax.net>

> app = lambda do |env|
>   [200, { 'Content-Type' => "text/html" }, ['Logged in!']]
> end

> app = Rack::Digest::MD5.new(app) do |username, password|
>   username == "foo" && password == "bar"
> end

> run app

> > app = lambda do |env|
> >   [200, { 'Content-Type' => "text/html" }, ['Logged in!']]
> > end

> > app = Rack::Digest::MD5.new(app) do |username, password|
> >   username == "foo" && password == "bar"
> > end

> > run app

> Thanks, but what about if I just want to ask for authentication depending
>  on the URL?
> For example:

> I require authentication if the URL is:
>   http://domain.org/service1/users/al...@domain.org/index.xml

> But I don't require authentication if the URL is:
>   http://domain.org/service1/global/index.xml

> Also, there are cases in which I require Digest authentication if method is
> PUT but not for GET.

> > Hi, could I get an example of Rack::Auth::Digest::MD5 usage? By reading
> > the

> > doc I get confussed:
>  : (snip)

> > Thanks, but what about if I just want to ask for authentication depending
> >  on the URL?

> Please try this example:

> ----
> class DigestAuthApp
>   USERS = {
>     'office' => {
>       'alice' => 'opensesame',
>     },
>     'home' => {
>       'bob' => 'hello',
>     },
>   }

>   def call(env)
>     req = Rack::Request.new(env)
>     return view_global(env) if %r!^/service1/global/! =~ req.fullpath
>     _, user, realm, path = *%r!^/service1/users/(\w+)@([^/]+)/
> (.*)!.match(req.fullpath)

>     # authentication needed for users area
>     env = callcc do |cont|
>       auth = Rack::Auth::Digest::MD5.new(cont, realm) {|u| USERS[realm]
> [user] }
>       auth.opaque = $$.to_s  # or your favorite opaque
>       return auth.call(env)  # => returns 401 if not authenticated
>     end
>     # authenticated
>     req = Rack::Request.new(env)
>     auth_user = req.env['REMOTE_USER']

>     body = ''
>     [['user', auth_user], ['realm', realm], ['path', path]].each do |
> k, v|
>       body += k + ': ' + v + "\n"
>     end
>     [200, {"Content-Type" => "text/plain"}, body]
>   end

>   def view_global(env)
>     [200, {"Content-Type" => "text/plain"}, 'Welcome to global area.
> Enjoy!']
>   end
> end
> ----

> for /service1/users/.*@office/something:
>   alice is permitted. bob is not.

> for /service1/users/.*@home/something:
>   bob is permitted. alice is not.

> for /service1/global/something:
>   Everyone is permitted.

> I get an error: what is "callcc"?

> > I get an error: what is "callcc"?

> Ops, 'callcc' exists in Ruby1.8, but not in 1.9 !