Added new infrastructure support for REST webservices.

By default application/xml posts are handled by creating a XmlNode object with the same name as the root element of the submitted xml. M$

 ActionController::Base.param_parsers['application/atom+xml'] = Proc.new do |data|
    node = REXML::Document.new(post)
   { node.root.name => node.root }
 end

 XmlSimple and Yaml web services were retired, ActionController::Base.param_parsers carries an example which shows how to get this functio$
 request.[formatted_post?, xml_post?, yaml_post? and post_format] were all deprecated in favor of request.content_type [Tobias Luetke]

Closes #4081


git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3777 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/CHANGELOG

@@ -1,5 +1,16 @@
 *SVN*
 
+* Added new infrastructure support for REST webservices. 
+  By default application/xml posts are handled by creating a XmlNode object with the same name as the root element of the submitted xml. More handlers can easily be registered like this
+
+ ActionController::Base.param_parsers['application/atom+xml'] = Proc.new do |data| 
+    node = REXML::Document.new(post) 
+   { node.root.name => node.root }
+ end
+ 
+ XmlSimple and Yaml web services were retired, ActionController::Base.param_parsers carries an example which shows how to get this functionality back. 
+ request.[formatted_post?, xml_post?, yaml_post? and post_format] were all deprecated in favor of request.content_type [Tobias Luetke]
+ 
 * Fixed Effect.Appear in effects.js to work with floats in Safari #3524, #3813, #3044 [Thomas Fuchs]
 
 * Fixed that default image extension was not appended when using a full URL with AssetTagHelper#image_tag #4032, #3728 [rubyonrails@beautifulpixel.com]

actionpack/lib/action_controller.rb

@@ -36,6 +36,8 @@ end
 
 require 'action_controller/base'
 require 'action_controller/deprecated_redirects'
+require 'action_controller/request'
+require 'action_controller/deprecated_request_methods'
 require 'action_controller/rescue'
 require 'action_controller/benchmarking'
 require 'action_controller/flash'

actionpack/lib/action_controller/base.rb

@@ -260,6 +260,37 @@ module ActionController #:nodoc:
     @@allow_concurrency = false
     cattr_accessor :allow_concurrency
 
+    # Modern REST web services often need to submit complex data to the web application. 
+    # the param_parsers hash lets you register handlers wich will process the http body and add parameters to the 
+    # @params hash. These handlers are invoked for post and put requests.
+    #
+    # By default application/xml is enabled. a XmlNode class with the same param name as the root 
+    # will be instanciated in the @params. 
+    # 
+    # Example:
+    #
+    #   ActionController::Base.param_parsers['application/atom+xml'] = Proc.new do |data| 
+    #      node = REXML::Document.new(post) 
+    #     { node.root.name => node.root }
+    #   end
+    #
+    # Note: Up until release 1.1 rails would default to using XmlSimple for such requests. To get the old 
+    # behavior you can re-register XmlSimple as application/xml handler and enable application/x-yaml like 
+    # this:
+    #
+    #   ActionController::Base.param_parsers['application/xml'] = Proc.new do |data| 
+    #     XmlSimple.xml_in(data, 'ForceArray' => false)
+    #   end
+    #
+    #   ActionController::Base.param_parsers['application/x-yaml'] = Proc.new do |data| 
+    #     |post| YAML.load(post)
+    #   end
+    #
+    @@param_parsers = {
+      'application/xml'     => Proc.new { |post| node = XmlNode.from_xml(post); { node.node_name => node } },
+    }
+    cattr_accessor :param_parsers 
+
     # Template root determines the base from which template references will be made. So a call to render("test/template")
     # will be converted to "#{template_root}/test/template.rhtml".
     class_inheritable_accessor :template_root

actionpack/lib/action_controller/cgi_ext/cgi_methods.rb

@@ -1,5 +1,6 @@
 require 'cgi'
 require 'action_controller/vendor/xml_simple'
+require 'action_controller/vendor/xml_node'
 
 # Static methods for parsing the query and request parameters that can be used in
 # a CGI extension class or testing in isolation.
@@ -58,12 +59,7 @@ class CGIMethods #:nodoc:
     end
 
     def self.parse_formatted_request_parameters(format, raw_post_data)
-      case format
-        when :xml
-          return XmlSimple.xml_in(raw_post_data, 'ForceArray' => false)
-        when :yaml
-          return YAML.load(raw_post_data)
-      end
+      ActionController::Base.param_parsers[format].call(raw_post_data) || {}
     rescue Object => e
       { "exception" => "#{e.message} (#{e.class})", "backtrace" => e.backtrace, 
         "raw_post_data" => raw_post_data, "format" => format }

actionpack/lib/action_controller/cgi_process.rb

@@ -64,8 +64,8 @@ module ActionController #:nodoc:
     end
 
     def request_parameters
-      if formatted_post?
-        CGIMethods.parse_formatted_request_parameters(post_format, @env['RAW_POST_DATA'])
+      if ActionController::Base.param_parsers.has_key?(content_type)
+        CGIMethods.parse_formatted_request_parameters(content_type, @env['RAW_POST_DATA'])
       else
         CGIMethods.parse_request_parameters(@cgi.params)
       end

actionpack/lib/action_controller/deprecated_request_methods.rb

@@ -0,0 +1,34 @@
+module ActionController
+  class AbstractRequest
+    # Determine whether the body of a HTTP call is URL-encoded (default)
+    # or matches one of the registered param_parsers. 
+    #
+    # For backward compatibility, the post format is extracted from the
+    # X-Post-Data-Format HTTP header if present.
+    def post_format
+      case content_type
+      when 'application/xml'
+        :xml
+      when 'application/x-yaml'
+        :yaml
+      else
+        :url_encoded
+      end
+    end
+
+    # Is this a POST request formatted as XML or YAML?
+    def formatted_post?
+      post? && (post_format == :yaml || post_format == :xml)
+    end
+
+    # Is this a POST request formatted as XML?
+    def xml_post?
+      post? && post_format == :xml
+    end
+
+    # Is this a POST request formatted as YAML?
+    def yaml_post?
+      post? && post_format == :yaml
+    end
+  end
+end

actionpack/lib/action_controller/request.rb

@@ -42,44 +42,25 @@ module ActionController
       method == :head
     end
 
-    # Determine whether the body of a POST request is URL-encoded (default),
-    # XML, or YAML by checking the Content-Type HTTP header:
-    #
-    #   Content-Type        Post Format
-    #   application/xml     :xml
-    #   text/xml            :xml
-    #   application/x-yaml  :yaml
-    #   text/x-yaml         :yaml
-    #   *                   :url_encoded
+    # Determine whether the body of a HTTP call is URL-encoded (default)
+    # or matches one of the registered param_parsers. 
     #
     # For backward compatibility, the post format is extracted from the
     # X-Post-Data-Format HTTP header if present.
-    def post_format
-      @post_format ||=
+    def content_type
+      return @content_type if @content_type
+
+      @content_type = @env['CONTENT_TYPE'].to_s.downcase
+      
       if @env['HTTP_X_POST_DATA_FORMAT']          
-             @env['HTTP_X_POST_DATA_FORMAT'].downcase.to_sym
-           else
-             case @env['CONTENT_TYPE'].to_s.downcase
-             when 'application/xml', 'text/xml'        then :xml
-             when 'application/x-yaml', 'text/x-yaml'  then :yaml
-             else :url_encoded
+        case @env['HTTP_X_POST_DATA_FORMAT'].downcase.to_sym
+        when :yaml
+          @content_type = 'application/x-yaml'
+        when :xml
+          @content_type = 'application/xml'
         end
       end
-    end
-
-    # Is this a POST request formatted as XML or YAML?
-    def formatted_post?
-      post? && (post_format == :xml || post_format == :yaml)
-    end
-
-    # Is this a POST request formatted as XML?
-    def xml_post?
-      post? && post_format == :xml
-    end
-
-    # Is this a POST request formatted as YAML?
-    def yaml_post?
-      post? && post_format == :yaml
+      @content_type
     end
 
     # Returns true if the request's "X-Requested-With" header contains

actionpack/lib/action_controller/vendor/xml_node.rb

@@ -0,0 +1,98 @@
+require 'rexml/document'
+
+# SimpleXML like xml parser. Written by leon breet from the ruby on rails Mailing list
+# 
+class XmlNode
+  attr :node
+
+  def initialize(node, options = {})
+    @node = node
+    @children = {}
+    @raise_errors = options[:raise_errors]
+  end
+
+  def self.from_xml(xml_or_io)
+    document = REXML::Document.new(xml_or_io)
+    if document.root 
+      XmlNode.new(document.root) 
+    else
+      XmlNode.new(document) 
+    end
+  end
+
+  def node_encoding
+    @node.encoding
+  end
+
+  def node_name
+    @node.name
+  end
+
+  def node_value
+    @node.text
+  end
+
+  def node_value=(value)
+    @node.text = value
+  end
+
+  def xpath(expr)
+    matches = nil
+    REXML::XPath.each(@node, expr) do |element|
+      matches ||= XmlNodeList.new
+      matches << (@children[element] ||= XmlNode.new(element))
+    end
+    matches
+  end
+
+  def method_missing(name, *args)
+    name = name.to_s
+    nodes = nil
+    @node.each_element(name) do |element|
+      nodes ||= XmlNodeList.new
+      nodes << (@children[element] ||= XmlNode.new(element))
+    end
+    nodes
+  end
+
+  def <<(node)
+    if node.is_a? REXML::Node
+      child = node
+    elsif node.respond_to? :node
+      child = node.node
+    end
+    @node.add_element child
+    @children[child] ||= XmlNode.new(child)
+  end
+
+  def [](name)
+    @node.attributes[name.to_s]
+  end
+
+  def []=(name, value)
+    @node.attributes[name.to_s] = value
+  end
+
+  def to_s
+    @node.to_s
+  end
+
+  def to_i
+    to_s.to_i
+  end
+end
+
+class XmlNodeList < Array
+  def [](i)
+    i.is_a?(String) ? super(0)[i] : super(i)
+  end
+
+  def []=(i, value)
+    i.is_a?(String) ? self[0][i] = value : super(i, value)
+  end
+
+  def method_missing(name, *args)
+    name = name.to_s
+    self[0].__send__(name, *args)
+  end
+end

actionpack/test/abstract_unit.rb

@@ -2,6 +2,7 @@ $:.unshift(File.dirname(__FILE__) + '/../lib')
 $:.unshift(File.dirname(__FILE__) + '/../../activesupport/lib/active_support')
 $:.unshift(File.dirname(__FILE__) + '/fixtures/helpers')
 
+require 'yaml'
 require 'test/unit'
 require 'action_controller'
 require 'breakpoint'
@@ -11,4 +12,3 @@ require 'action_controller/test_process'
 ActionController::Base.logger = nil
 ActionController::Base.ignore_missing_templates = false
 ActionController::Routing::Routes.reload rescue nil
-

actionpack/test/controller/webservice_test.rb

@@ -0,0 +1,146 @@
+require File.dirname(__FILE__) + '/../abstract_unit'
+require 'stringio'
+
+class WebServiceTest < Test::Unit::TestCase
+
+  class MockCGI < CGI #:nodoc:
+    attr_accessor :stdinput, :stdoutput, :env_table
+
+    def initialize(env, data = '')      
+      self.env_table = env
+      self.stdinput = StringIO.new(data)
+      self.stdoutput = StringIO.new
+      super()
+    end
+  end
+
+
+  class TestController < ActionController::Base
+    session :off
+
+    def assign_parameters
+      render :text => (@params.keys - ['controller', 'action']).sort.join(", ")
+    end
+
+    def rescue_action(e) raise end
+  end
+  
+  def setup
+    @controller = TestController.new
+  end
+  
+  def test_check_parameters
+    process('GET')
+    assert_equal '', @controller.response.body
+  end
+
+  def test_post_xml
+    process('POST', 'application/xml', '<entry attributed="true"><summary>content...</summary></entry>')
+    
+    assert_equal 'entry', @controller.response.body
+    assert @controller.params.has_key?(:entry)
+    assert_equal 'content...', @controller.params["entry"].summary.node_value
+    assert_equal 'true', @controller.params["entry"]['attributed']
+  end
+  
+  def test_put_xml
+    process('PUT', 'application/xml', '<entry attributed="true"><summary>content...</summary></entry>')
+    
+    assert_equal 'entry', @controller.response.body
+    assert @controller.params.has_key?(:entry)
+    assert_equal 'content...', @controller.params["entry"].summary.node_value
+    assert_equal 'true', @controller.params["entry"]['attributed']
+  end
+
+  def test_register_and_use_yaml
+    ActionController::Base.param_parsers['application/x-yaml'] = Proc.new { |d| YAML.load(d) }
+    process('POST', 'application/x-yaml', {"entry" => "loaded from yaml"}.to_yaml)
+    assert @controller.params.has_key?(:entry)
+    assert_equal 'loaded from yaml', @controller.params["entry"]
+  ensure
+    ActionController::Base.param_parsers['application/x-yaml'] = nil
+  end
+  
+  
+  def test_deprecated_request_methods
+    process('POST', 'application/x-yaml')
+    assert_equal 'application/x-yaml', @controller.request.content_type
+    assert_equal true, @controller.request.post?
+    assert_equal :yaml, @controller.request.post_format
+    assert_equal true, @controller.request.yaml_post?
+    assert_equal false, @controller.request.xml_post?    
+  end
+  
+  
+  private  
+  
+  def process(verb, content_type = 'application/x-www-form-urlencoded', data = '')
+    
+    cgi = MockCGI.new({
+      'REQUEST_METHOD' => verb,
+      'CONTENT_TYPE'   => content_type,
+      'QUERY_STRING'   => "action=assign_parameters&controller=webservicetest/test",
+      "REQUEST_URI"    => "/",
+      "HTTP_HOST"      => 'testdomain.com',
+      "CONTENT_LENGTH" => data.size,
+      "SERVER_PORT"    => "80",
+      "HTTPS"          => "off"}, data)
+          
+    @controller.send(:process, ActionController::CgiRequest.new(cgi, {}), ActionController::CgiResponse.new(cgi))
+  end
+    
+end
+
+
+class XmlNodeTest < Test::Unit::TestCase
+  def test_all
+    xn = XmlNode.from_xml(%{<?xml version="1.0" encoding="UTF-8"?>
+      <response success='true'>
+      <page title='Ajax Summit' id='1133' email_address='ry87ib@backpackit.com'>
+        <description>With O'Reilly and Adaptive Path</description>
+        <notes>
+          <note title='Hotel' id='1020' created_at='2005-05-14 16:41:11'>
+            Staying at the Savoy
+          </note>
+        </notes>
+        <tags>
+          <tag name='Technology' id='4' />
+          <tag name='Travel' id='5' />
+        </tags>
+      </page>
+      </response>
+     }
+    )     
+    assert_equal 'UTF-8', xn.node.document.encoding
+    assert_equal '1.0', xn.node.document.version
+    assert_equal 'true', xn['success']
+    assert_equal 'response', xn.node_name
+    assert_equal 'Ajax Summit', xn.page['title']
+    assert_equal '1133', xn.page['id']
+    assert_equal "With O'Reilly and Adaptive Path", xn.page.description.node_value
+    assert_equal nil, xn.nonexistent
+    assert_equal "Staying at the Savoy", xn.page.notes.note.node_value.strip
+    assert_equal 'Technology', xn.page.tags.tag[0]['name']
+    assert_equal 'Travel', xn.page.tags.tag[1][:name]
+    matches = xn.xpath('//@id').map{ |id| id.to_i }
+    assert_equal [4, 5, 1020, 1133], matches.sort
+    matches = xn.xpath('//tag').map{ |tag| tag['name'] }
+    assert_equal ['Technology', 'Travel'], matches.sort
+    assert_equal "Ajax Summit", xn.page['title']
+    xn.page['title'] = 'Ajax Summit V2'
+    assert_equal "Ajax Summit V2", xn.page['title']
+    assert_equal "Staying at the Savoy", xn.page.notes.note.node_value.strip
+    xn.page.notes.note.node_value = "Staying at the Ritz"
+    assert_equal "Staying at the Ritz", xn.page.notes.note.node_value.strip
+    assert_equal '5', xn.page.tags.tag[1][:id]
+    xn.page.tags.tag[1]['id'] = '7'
+    assert_equal '7', xn.page.tags.tag[1]['id']
+  end
+  
+
+  def test_small_entry
+    node = XmlNode.from_xml('<entry>hi</entry>')
+    assert_equal 'hi', node.node_value
+  end
+
+end