* lib/webrick: imported.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4130 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/webrick/httpauth/authenticator.rb

@@ -0,0 +1,79 @@
+#
+# httpauth/authenticator.rb -- Authenticator mix-in module.
+#
+# Author: IPR -- Internet Programming with Ruby -- writers
+# Copyright (c) 2003 Internet Programming with Ruby writers. All rights
+# reserved.
+#
+# $IPR: authenticator.rb,v 1.3 2003/02/20 07:15:47 gotoyuzo Exp $
+
+module WEBrick
+  module HTTPAuth
+    module Authenticator
+      RequestField      = "Authorization"
+      ResponseField     = "WWW-Authenticate"
+      ResponseInfoField = "Authentication-Info"
+      AuthException     = HTTPStatus::Unauthorized
+      AuthScheme        = nil # must override by the derived class
+
+      attr_reader :realm, :userdb, :logger
+
+      private
+
+      def check_init(config)
+        [:UserDB, :Realm].each{|sym|
+          unless config[sym]
+            raise ArgumentError, "Argument #{sym.inspect} missing."
+          end
+        } 
+        @realm     = config[:Realm]
+        @userdb    = config[:UserDB]
+        @logger    = config[:Logger] || Log::new($stderr)
+        @reload_db = config[:AutoReloadUserDB]
+        @request_field   = self::class::RequestField
+        @response_field  = self::class::ResponseField
+        @resp_info_field = self::class::ResponseInfoField
+        @auth_exception  = self::class::AuthException
+        @auth_scheme     = self::class::AuthScheme
+      end
+
+      def check_scheme(req)
+        unless credentials = req[@request_field]
+          error("no credentials in the request.")
+          return nil 
+        end  
+        unless match = /^#{@auth_scheme}\s+/.match(credentials)
+          error("invalid scheme in %s.", credentials)
+          info("%s: %s", @request_field, credentials) if $DEBUG
+          return nil
+        end
+        return match.post_match
+      end
+
+      def log(meth, fmt, *args)
+        msg = format("%s %s: ", @auth_scheme, @realm)
+        msg << fmt % args
+        @logger.send(meth, msg)
+      end
+
+      def error(fmt, *args)
+        if @logger.error?
+          log(:error, fmt, *args)
+        end
+      end                             
+
+      def info(fmt, *args)
+        if @logger.info?
+          log(:info, fmt, *args)
+        end
+      end
+    end
+
+    module ProxyAuthenticator
+      RequestField  = "Proxy-Authorization"
+      ResponseField = "Proxy-Authenticate"
+      InfoField     = "Proxy-Authentication-Info"
+      AuthException = HTTPStatus::ProxyAuthenticationRequired
+    end
+  end
+end