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Contents
module Aws
module DynamoDB
module Plugins
class CRC32Validation < Seahorse::Client::Plugin
option(:compute_checksums,
default: true,
doc_type: 'Boolean',
docstring: <<-DOCS)
When `true`, a CRC32 checksum is computed of every HTTP
response body and compared against the `X-Amz-Crc32` header.
If the checksums do not match, the request is re-sent.
Failures can be retried up to `:retry_limit` times.
DOCS
def add_handlers(handlers, config)
if config.compute_checksums
handlers.add(Handler, step: :sign)
end
end
class Handler < Seahorse::Client::Handler
def call(context)
# disable response gzipping - Net::HTTP unzips these responses
# before we can see the body, making it impossible to verify
# the CRC32 checksum against the compressed body stream
context.http_request.headers['accept-encoding'] = ''
@handler.call(context).on_success do |response|
response.error = validate(context)
end
end
private
def validate(context)
unless crc32_is_valid?(context.http_response)
msg = "Response failed CRC32 check."
return Errors::CRC32CheckFailed.new(context, msg)
end
end
def crc32_is_valid?(response)
if crc_checksum = response.headers['x-amz-crc32']
crc_checksum.to_i == Zlib.crc32(response.body_contents)
else
true
end
end
end
end
end
end
end
Version data entries
65 entries across 65 versions & 1 rubygems