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@@ -1,5 +1,15 @@
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 *SVN*
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+* Automatically parse posted JSON content for Mime::JSON requests.  [rick]
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+
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+  POST /posts
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+  {"post": {"title": "Breaking News"}}
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+
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+  def create
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+    @post = Post.create params[:post]
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+    # ...
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+  end
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+
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 * add json_escape ERB util to escape html entities in json strings that are output in HTML pages. [rick]
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 * Provide a helper proxy to access helper methods from outside views. Closes #10839 [Josh Peek]

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@@ -316,9 +316,10 @@ module ActionController #:nodoc:
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     # A YAML parser is also available and can be turned on with:
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     #
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     #   ActionController::Base.param_parsers[Mime::YAML] = :yaml
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-    @@param_parsers = { Mime::MULTIPART_FORM => :multipart_form,
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+    @@param_parsers = { Mime::MULTIPART_FORM   => :multipart_form,
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                         Mime::URL_ENCODED_FORM => :url_encoded_form,
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-                        Mime::XML => :xml_simple }
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+                        Mime::XML              => :xml_simple,
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+                        Mime::JSON             => :json }
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     cattr_accessor :param_parsers
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     # Controls the default charset for all renders.

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@@ -402,6 +402,14 @@ EOM
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             body.blank? ? {} : Hash.from_xml(body).with_indifferent_access
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           when :yaml
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             YAML.load(body)
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+          when :json
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+            if body.blank?
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+              {}
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+            else
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+              data = ActiveSupport::JSON.decode(body)
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+              data = {:_json => data} unless data.is_a?(Hash)
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+              data.with_indifferent_access
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+            end
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           else
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             {}
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         end
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@@ -507,7 +515,6 @@ EOM
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           end
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         end
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-
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         MULTIPART_BOUNDARY = %r|\Amultipart/form-data.*boundary=\"?([^\";,]+)\"?|n
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         EOL = "\015\012"
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@@ -604,12 +611,12 @@ EOM
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           end
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           raise EOFError, "bad boundary end of body part" unless boundary_end=~/--/
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-	  begin
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+          begin
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             body.rewind if body.respond_to?(:rewind)
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-	  rescue Errno::ESPIPE
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+          rescue Errno::ESPIPE
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             # Handles exceptions raised by input streams that cannot be rewound
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             # such as when using plain CGI under Apache
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-	  end
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+          end
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           params
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         end

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@@ -3,7 +3,7 @@ require 'erb'
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 class ERB
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   module Util
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     HTML_ESCAPE = { '&' => '&amp;',  '>' => '&gt;',   '<' => '&lt;', '"' => '&quot;' }
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-    JSON_ESCAPE = { '&' => '\u0026', '>' => '\u003E', '<' => '\u003C'}
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+    JSON_ESCAPE = { '&' => '\u0026', '>' => '\u003E', '<' => '\u003C' }
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     # A utility method for escaping HTML tag characters.
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     # This method is also aliased as <tt>h</tt>.

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@@ -851,8 +851,13 @@ class MultipartRequestParameterParsingTest < Test::Unit::TestCase
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     end
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 end
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-
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 class XmlParamsParsingTest < Test::Unit::TestCase
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+  def test_hash_params
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+    person = parse_body("<person><name>David</name></person>")[:person]
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+    assert_kind_of Hash, person
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+    assert_equal 'David', person['name']
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+  end
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+
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   def test_single_file
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     person = parse_body("<person><name>David</name><avatar type='file' name='me.jpg' content_type='image/jpg'>#{ActiveSupport::Base64.encode64('ABC')}</avatar></person>")
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@@ -899,3 +904,19 @@ class LegacyXmlParamsParsingTest < XmlParamsParsingTest
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       ActionController::CgiRequest.new(cgi).request_parameters
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     end
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 end
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+
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+class JsonParamsParsingTest < Test::Unit::TestCase
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+  def test_hash_params
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+    person = parse_body({:person => {:name => "David"}}.to_json)[:person]
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+    assert_kind_of Hash, person
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+    assert_equal 'David', person['name']
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+  end
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+
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+  private
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+    def parse_body(body)
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+      env = { 'CONTENT_TYPE'   => 'application/json',
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+              'CONTENT_LENGTH' => body.size.to_s }
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+      cgi = ActionController::Integration::Session::StubCGI.new(env, body)
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+      ActionController::CgiRequest.new(cgi).request_parameters
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+    end
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+end