Allow realm to be passed to auth handler's initialize method

Signed-off-by: Ryan Tomayko <rtomayko@gmail.com>

example/protectedlobster.ru

@@ -1,7 +1,7 @@
 require 'rack/lobster'
 
 use Rack::ShowExceptions
-use Rack::Auth::Basic do |username, password|
+use Rack::Auth::Basic, "Lobster 2.0" do |username, password|
   'secret' == password
 end
 

lib/rack/auth/abstract/handler.rb

@@ -8,8 +8,8 @@ class AbstractHandler
 
       attr_accessor :realm
 
-      def initialize(app, &authenticator)
-        @app, @authenticator = app, authenticator
+      def initialize(app, realm=nil, &authenticator)
+        @app, @realm, @authenticator = app, realm, authenticator
       end
 
 

lib/rack/auth/digest/md5.rb

@@ -21,7 +21,7 @@ class MD5 < AbstractHandler
 
         attr_writer :passwords_hashed
 
-        def initialize(app)
+        def initialize(*args)
           super
           @passwords_hashed = nil
         end

test/spec_rack_auth_basic.rb

@@ -35,7 +35,7 @@ def assert_basic_auth_challenge(response)
     response.should.be.a.client_error
     response.status.should.equal 401
     response.should.include 'WWW-Authenticate'
-    response.headers['WWW-Authenticate'].should =~ /Basic realm="/
+    response.headers['WWW-Authenticate'].should =~ /Basic realm="#{Regexp.escape(realm)}"/
     response.body.should.be.empty
   end
 
@@ -66,4 +66,8 @@ def assert_basic_auth_challenge(response)
     end
   end
 
+  specify 'realm as optional constructor arg' do
+    app = Rack::Auth::Basic.new(unprotected_app, realm) { true }
+    assert_equal realm, app.realm
+  end
 end

test/spec_rack_auth_digest.rb

@@ -218,4 +218,9 @@ def assert_bad_request(response)
       response.body.to_s.should.equal 'Hi Alice'
     end
   end
+
+  specify 'realm as optional constructor arg' do
+    app = Rack::Auth::Digest::MD5.new(unprotected_app, realm) { true }
+    assert_equal realm, app.realm
+  end
 end