Rely on duck type instead of mappings settings.

CHANGELOG.rdoc

@@ -1,3 +1,6 @@
+* enhancements
+  * Added Http Basic Authentication support
+
 == 0.9.2
 
 * bug fix

TODO

@@ -1,4 +1,3 @@
 * Make test run with DataMapper
 * Add Registerable support
-* Add http authentication support
 * Extract Activatable tests from Confirmable

lib/devise/mapping.rb

@@ -36,7 +36,10 @@ module Devise
 
     # Find a mapping by a given class. It takes into account single table inheritance as well.
     def self.find_by_class(klass)
-      Devise.mappings.values.find { |m| return m if klass <= m.to }
+      Devise.mappings.each_value do |mapping|
+        return mapping if klass <= mapping.to
+      end
+      nil
     end
 
     # Receives an object and find a scope for it. If a scope cannot be found,

lib/devise/strategies/authenticatable.rb

@@ -6,7 +6,7 @@ module Devise
     # Redirects to sign_in page if it's not authenticated
     class Authenticatable < Base
       def valid?
-        super && params[scope] && params[scope][:password].present?
+        params[scope] && params[scope][:password].present? && mapping.to.respond_to?(:authenticate)
       end
 
       # Authenticate a user based on email and password params, returning to warden

lib/devise/strategies/base.rb

@@ -2,22 +2,14 @@ module Devise
   module Strategies
     # Base strategy for Devise. Responsible for verifying correct scope and mapping.
     class Base < ::Warden::Strategies::Base
-      # Validate strategy. By default will raise an error if no scope or an
-      # invalid mapping is found.
-      def valid?
-        raise "Could not find mapping for #{scope}" unless mapping
-        mapping.for.include?(klass_type)
-      end
-
       # Checks if a valid scope was given for devise and find mapping based on
       # this scope.
       def mapping
-        Devise.mappings[scope]
-      end
-
-      # Store this class type.
-      def klass_type
-        @klass_type ||= self.class.name.split("::").last.underscore.to_sym
+        @mapping ||= begin
+          mapping = Devise.mappings[scope]
+          raise "Could not find mapping for #{scope}" unless mapping
+          mapping
+        end
       end
     end
   end

lib/devise/strategies/http_authenticatable.rb

@@ -5,7 +5,7 @@ module Devise
     # Sign in an user using HTTP authentication.
     class HttpAuthenticatable < Base
       def valid?
-        http_authentication?
+        http_authentication? && mapping.to.respond_to?(:authenticate_with_http)
       end
 
       def authenticate!

lib/devise/strategies/rememberable.rb

@@ -10,7 +10,7 @@ module Devise
 
       # A valid strategy for rememberable needs a remember token in the cookies.
       def valid?
-        super && remember_me_cookie.present?
+        remember_me_cookie.present? && mapping.to.respond_to?(:serialize_from_cookie)
       end
 
       # To authenticate a user we deserialize the cookie and attempt finding

lib/devise/strategies/token_authenticatable.rb

@@ -6,7 +6,7 @@ module Devise
     # Redirects to sign_in page if it's not authenticated.
     class TokenAuthenticatable < Base
       def valid?
-        super && authentication_token(scope).present?
+        mapping.to.respond_to?(:authenticate_with_token) && authentication_token(scope).present?
       end
 
       # Authenticate a user based on authenticatable token params, returning to warden