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# frozen_string_literal: true
# Copyright, 2017, by Samuel G. D. Williams. <http://www.codeotaku.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
require_relative 'middleware'
require_relative 'body/buffered'
require_relative 'body/deflate'
module Protocol
module HTTP
# Encode a response according the the request's acceptable encodings.
class ContentEncoding < Middleware
DEFAULT_WRAPPERS = {
'gzip' => Body::Deflate.method(:for)
}
DEFAULT_CONTENT_TYPES = %r{^(text/.*?)|(.*?/json)|(.*?/javascript)$}
def initialize(app, content_types = DEFAULT_CONTENT_TYPES, wrappers = DEFAULT_WRAPPERS)
super(app)
@content_types = content_types
@wrappers = wrappers
end
def call(request)
response = super
# Early exit if the response has already specified a content-encoding.
return response if response.headers['content-encoding']
# This is a very tricky issue, so we avoid it entirely.
# https://lists.w3.org/Archives/Public/ietf-http-wg/2014JanMar/1179.html
return response if response.partial?
# Ensure that caches are aware we are varying the response based on the accept-encoding request header:
response.headers.add('vary', 'accept-encoding')
# TODO use http-accept and sort by priority
if !response.body.empty? and accept_encoding = request.headers['accept-encoding']
if content_type = response.headers['content-type'] and @content_types =~ content_type
body = response.body
accept_encoding.each do |name|
if wrapper = @wrappers[name]
response.headers['content-encoding'] = name
body = wrapper.call(body)
break
end
end
response.body = body
end
end
return response
end
end
end
end
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