Class: Protocol::HTTP::AcceptEncoding

Inherits:
Middleware show all
Defined in:
lib/protocol/http/accept_encoding.rb

Overview

A middleware that sets the accept-encoding header and decodes the response according to the content-encoding header.

Constant Summary collapse

ACCEPT_ENCODING =

The header used to request encodings.

"accept-encoding".freeze
CONTENT_ENCODING =

The header used to specify encodings.

"content-encoding".freeze
DEFAULT_WRAPPERS =

The default wrappers to use for decoding content.

{
  "gzip" => Body::Inflate.method(:for),
  
  # There is no point including this:
  # 'identity' => ->(body){body},
}

Constants inherited from Methods

Methods::CONNECT, Methods::DELETE, Methods::GET, Methods::HEAD, Methods::OPTIONS, Methods::PATCH, Methods::POST, Methods::PUT, Methods::TRACE

Instance Attribute Summary

Attributes inherited from Middleware

#delegate

Instance Method Summary collapse

Methods inherited from Middleware

#The delegate object that is used for passing along requests that are not handled by *this* middleware.=, build, #close, for

Methods inherited from Methods

each, valid?

Constructor Details

#initialize(delegate, wrappers = DEFAULT_WRAPPERS) ⇒ AcceptEncoding

Initialize the middleware with the given delegate and wrappers.



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# File 'lib/protocol/http/accept_encoding.rb', line 33

def initialize(delegate, wrappers = DEFAULT_WRAPPERS)
  super(delegate)
  
  @accept_encoding = wrappers.keys.join(", ")
  @wrappers = wrappers
end

Instance Method Details

#call(request) ⇒ Object

Set the accept-encoding header and decode the response body.



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# File 'lib/protocol/http/accept_encoding.rb', line 44

def call(request)
  request.headers[ACCEPT_ENCODING] = @accept_encoding
  
  response = super
  
  if body = response.body and !body.empty? and content_encoding = response.headers.delete(CONTENT_ENCODING)
    # We want to unwrap all encodings
    content_encoding.reverse_each do |name|
      if wrapper = @wrappers[name]
        body = wrapper.call(body)
      end
    end
    
    response.body = body
  end
  
  return response
end