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vendor/rails/actionpack/lib/action_controller/params_parser.rb

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module ActionController

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  class ParamsParser

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    ActionController::Base.param_parsers[Mime::XML] = :xml_simple

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    ActionController::Base.param_parsers[Mime::JSON] = :json

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    def initialize(app)

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      @app = app

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    end

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    def call(env)

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      if params = parse_formatted_parameters(env)

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        env["action_controller.request.request_parameters"] = params

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      end

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      @app.call(env)

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    end

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    private

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      def parse_formatted_parameters(env)

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        request = Request.new(env)

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        return false if request.content_length.zero?

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        mime_type = content_type_from_legacy_post_data_format_header(env) || request.content_type

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        strategy = ActionController::Base.param_parsers[mime_type]

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        return false unless strategy

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        case strategy

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          when Proc

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            strategy.call(request.raw_post)

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          when :xml_simple, :xml_node

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            body = request.raw_post

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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(request.raw_post)

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          when :json

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            body = request.raw_post

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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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            false

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        end

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      rescue Exception => e # YAML, XML or Ruby code block errors

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        logger.debug "Error occurred while parsing request parameters.\nContents:\n\n#{request.raw_post}"

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        raise

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          { "body" => request.raw_post,

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            "content_type" => request.content_type,

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            "content_length" => request.content_length,

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            "exception" => "#{e.message} (#{e.class})",

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            "backtrace" => e.backtrace }

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      end

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      def content_type_from_legacy_post_data_format_header(env)

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        if x_post_format = env['HTTP_X_POST_DATA_FORMAT']

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          case x_post_format.to_s.downcase

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            when 'yaml'

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              return Mime::YAML

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            when 'xml'

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              return Mime::XML

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          end

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        end

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        nil

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      end

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      def logger

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        defined?(Rails.logger) ? Rails.logger : Logger.new($stderr)

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      end

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  end

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end

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