From 20eb59ad8a9e97a5bbb68df1ba2f15914c26a358 Mon Sep 17 00:00:00 2001
From: David Heinemeier Hansson <david@loudthinking.com>
Date: Tue, 8 May 2007 05:48:18 +0000
Subject: Included the HttpAuthentication plugin as part of core
 (ActionController::HttpAuthentication::Basic) [DHH]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@6699 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
---
 .../lib/action_controller/http_authentication.rb   | 121 +++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 actionpack/lib/action_controller/http_authentication.rb

(limited to 'actionpack/lib/action_controller')

diff --git a/actionpack/lib/action_controller/http_authentication.rb b/actionpack/lib/action_controller/http_authentication.rb
new file mode 100644
index 0000000000..387fa4e695
--- /dev/null
+++ b/actionpack/lib/action_controller/http_authentication.rb
@@ -0,0 +1,121 @@
+require 'base64'
+
+module ActionController
+  module HttpAuthentication
+    # Makes it dead easy to do HTTP Basic authentication.
+    # 
+    # Simple Basic example:
+    # 
+    # class PostsController < ApplicationController
+    #   USER_NAME, PASSWORD = "dhh", "secret"
+    # 
+    #   before_filter :authenticate, :except => [ :index ]
+    # 
+    #   def index
+    #     render :text => "Everyone can see me!"
+    #   end
+    # 
+    #   def edit
+    #     render :text => "I'm only accessible if you know the password"
+    #   end
+    # 
+    #   private
+    #     def authenticate
+    #       authenticate_or_request_with_http_basic do |user_name, password| 
+    #         user_name == USER_NAME && password == PASSWORD
+    #       end
+    #     end
+    # end
+    # 
+    # 
+    # Here is a more advanced Basic example where only Atom feeds and the XML API is protected by HTTP authentication, 
+    # the regular HTML interface is protected by a session approach:
+    # 
+    # class ApplicationController < ActionController::Base
+    #   before_filter :set_account, :authenticate
+    # 
+    #   protected
+    #     def set_account
+    #       @account = Account.find_by_url_name(request.subdomains.first)
+    #     end
+    # 
+    #     def authenticate
+    #       case request.format
+    #       when Mime::XML, Mime::ATOM
+    #         if user = authenticate_with_http_basic { |u, p| @account.users.authenticate(u, p) }
+    #           @current_user = user
+    #         else
+    #           request_http_basic_authentication
+    #         end
+    #       else
+    #         if session_authenticated?
+    #           @current_user = @account.users.find(session[:authenticated][:user_id])
+    #         else
+    #           redirect_to(login_url) and return false
+    #         end
+    #       end
+    #     end
+    # end
+    # 
+    # 
+    # In your integration tests, you can do something like this:
+    # 
+    #   def test_access_granted_from_xml
+    #     get(
+    #       "/notes/1.xml", nil, 
+    #       :authorization => ActionController::HttpAuthentication::Basic.encode_credentials(users(:dhh).name, users(:dhh).password)
+    #     )
+    # 
+    #     assert_equal 200, status
+    #   end
+    module Basic
+      extend self
+
+      module ControllerMethods
+        def authenticate_or_request_with_http_basic(realm = "Application", &login_procedure)
+          authenticate_with_http_basic(&login_procedure) || request_http_basic_authentication(realm)
+        end
+
+        def authenticate_with_http_basic(&login_procedure)
+          HttpAuthentication::Basic.authenticate(self, &login_procedure)
+        end
+
+        def request_http_basic_authentication(realm = "Application")
+          HttpAuthentication::Basic.authentication_request(self, realm)
+        end
+      end
+
+      def authenticate(controller, &login_procedure)
+        if authorization(controller.request)
+          login_procedure.call(*user_name_and_password(controller.request))
+        else
+          false
+        end
+      end
+
+      def user_name_and_password(request)
+        decode_credentials(request).split(/:/, 2)
+      end
+  
+      def authorization(request)
+        request.env['HTTP_AUTHORIZATION']   ||
+        request.env['X-HTTP_AUTHORIZATION'] ||
+        request.env['X_HTTP_AUTHORIZATION']
+      end
+    
+      def decode_credentials(request)
+        Base64.decode64(authorization(request).split.last)
+      end
+
+      def encode_credentials(user_name, password)
+        "Basic #{Base64.encode64("#{user_name}:#{password}")}"
+      end
+
+      def authentication_request(controller, realm)
+        controller.headers["WWW-Authenticate"] = %(Basic realm="#{realm.gsub(/"/, "")}")
+        controller.render :text => "HTTP Basic: Access denied.\n", :status => :unauthorized
+        return false    
+      end
+    end
+  end
+end
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