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#--
# Author:: Lamont Granquist (<lamont@chef.io>)
# Copyright:: Copyright 2013-2016, 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" unless defined?(PP)
require_relative "../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)
validate(http_response, http_response.body.bytesize) if http_response && http_response.body
[http_response, rest_request, return_value]
end
def handle_stream_complete(http_response, rest_request, return_value)
if @content_length_counter.nil?
Chef::Log.trace("No content-length information collected for the streamed download, cannot identify streamed download.")
else
validate(http_response, @content_length_counter.content_length)
end
# Make sure the counter is reset since this object might get used
# again. See CHEF-5100
@content_length_counter = nil
[http_response, rest_request, return_value]
end
def stream_response_handler(response)
@content_length_counter = ContentLengthCounter.new
end
private
def response_content_length(response)
return nil if response["content-length"].nil?
if response["content-length"].is_a?(Array)
response["content-length"].first.to_i
else
response["content-length"].to_i
end
end
def validate(http_response, response_length)
content_length = response_content_length(http_response)
transfer_encoding = http_response["transfer-encoding"]
if content_length.nil?
Chef::Log.trace "HTTP server did not include a Content-Length header in response, cannot identify truncated downloads."
return true
end
if content_length < 0
Chef::Log.trace "HTTP server responded with a negative Content-Length header (#{content_length}), cannot identify truncated downloads."
return true
end
# if Transfer-Encoding is set the RFC states that we must ignore the Content-Length field
# CHEF-5041: some proxies uncompress gzip content, leave the incorrect content-length, but set the transfer-encoding field
unless transfer_encoding.nil?
Chef::Log.trace "Transfer-Encoding header is set, skipping Content-Length check."
return true
end
if response_length != content_length
raise Chef::Exceptions::ContentLengthMismatch.new(response_length, content_length)
end
Chef::Log.trace "Content-Length validated correctly."
true
end
end
end
end
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