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#--
# Author:: Lamont Granquist (<lamont@getchef.com>)
# Copyright:: Copyright (c) 2013 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 'pp'
require 'chef/log'
class Chef
class HTTP
# Middleware that validates the Content-Length header against the downloaded number of bytes.
#
# This must run before the decompressor middleware, since otherwise we will count the uncompressed
# streamed bytes, rather than the on-the-wire compressed bytes.
class ValidateContentLength
class ContentLengthCounter
attr_accessor :content_length
def initialize
@content_length = 0
end
def handle_chunk(chunk)
@content_length += chunk.bytesize
chunk
end
end
def initialize(opts={})
end
def handle_request(method, url, headers={}, data=false)
[method, url, headers, data]
end
def handle_response(http_response, rest_request, return_value)
unless http_response['content-length']
Chef::Log.debug("HTTP server did not include a Content-Length header in response, cannot identify truncated downloads.")
return [http_response, rest_request, return_value]
end
validate(response_content_length(http_response), http_response.body.bytesize)
return [http_response, rest_request, return_value]
end
def handle_stream_complete(http_response, rest_request, return_value)
if http_response['content-length'].nil?
Chef::Log.debug("HTTP server did not include a Content-Length header in response, cannot idenfity streamed download.")
elsif @content_length_counter.nil?
Chef::Log.debug("No content-length information collected for the streamed download, cannot identify streamed download.")
else
validate(response_content_length(http_response), @content_length_counter.content_length)
end
return [http_response, rest_request, return_value]
end
def stream_response_handler(response)
@content_length_counter = ContentLengthCounter.new
end
private
def response_content_length(response)
if response['content-length'].is_a?(Array)
response['content-length'].first.to_i
else
response['content-length'].to_i
end
end
def validate(content_length, response_length)
Chef::Log.debug "Content-Length header = #{content_length}"
Chef::Log.debug "Response body length = #{response_length}"
if response_length != content_length
raise Chef::Exceptions::ContentLengthMismatch, "Response body length #{response_length} does not match HTTP Content-Length header #{content_length}."
end
true
end
end
end
end
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