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Viewing File: json_output.rb

#--
# Author:: Daniel DeLeo (<dan@chef.io>)
# Author:: John Keiser (<jkeiser@chef.io>)
# Copyright:: Copyright (c) Chef Software Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

require_relative "../json_compat"
require_relative "../log"

class Chef
  class HTTP

    # Middleware that takes an HTTP response, parses it as JSON if possible.
    class JSONOutput

      attr_accessor :raw_output
      attr_accessor :inflate_json_class

      def initialize(opts = {})
        @raw_output = opts[:raw_output]
        @inflate_json_class = opts[:inflate_json_class]
      end

      def handle_request(method, url, headers = {}, data = false)
        # Ideally this should always set Accept to application/json, but
        # Chef::REST is sometimes used to make non-JSON requests, so it sets
        # Accept to the desired value before middlewares get called.
        headers["Accept"] ||= "application/json"
        [method, url, headers, data]
      end

      def handle_response(http_response, rest_request, return_value)
        # temporary hack, skip processing if return_value is false
        # needed to keep conditional get stuff working correctly.
        return [http_response, rest_request, return_value] if return_value == false

        if /json/.match?(http_response["content-type"])
          if http_response.body.nil?
            return_value = nil
          elsif raw_output
            return_value = http_response.body.to_s
          else
            if inflate_json_class
              return_value = Chef::JSONCompat.from_json(http_response.body.chomp)
            else
              return_value = Chef::JSONCompat.parse(http_response.body.chomp)
            end
          end
          [http_response, rest_request, return_value]
        else
          Chef::Log.trace("Expected JSON response, but got content-type '#{http_response["content-type"]}'")
          if http_response.body
            Chef::Log.trace("Response body contains:\n#{http_response.body.length < 256 ? http_response.body : http_response.body[0..256] + " [...truncated...]"}")
          end
          [http_response, rest_request, http_response.body.to_s]
        end
      end

      def handle_stream_complete(http_response, rest_request, return_value)
        [http_response, rest_request, return_value]
      end

      def stream_response_handler(response)
        nil
      end

    end
  end
end