Class: PermessageDeflate::ServerSession

Inherits:
Session
  • Object
show all
Defined in:
lib/permessage_deflate/server_session.rb

Constant Summary

Constants inherited from Session

PermessageDeflate::Session::MAX_WINDOW_BITS, PermessageDeflate::Session::MIN_WINDOW_BITS, PermessageDeflate::Session::VALID_PARAMS, PermessageDeflate::Session::VALID_WINDOW_BITS

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Session

#close, #process_incoming_message, #process_outgoing_message

Constructor Details

#initialize(options, params) ⇒ ServerSession

Returns a new instance of ServerSession.



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# File 'lib/permessage_deflate/server_session.rb', line 14

def initialize(options, params)
  super(options)
  @params = params
end

Class Method Details

.valid_params?(params) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/permessage_deflate/server_session.rb', line 4

def self.valid_params?(params)
  return false unless super

  if params.has_key?('client_max_window_bits')
    return false unless ([true] + VALID_WINDOW_BITS).include?(params['client_max_window_bits'])
  end

  true
end

Instance Method Details

#generate_response ⇒ Object 



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# File 'lib/permessage_deflate/server_session.rb', line 19

def generate_response
  response = {}

  # https://tools.ietf.org/html/rfc7692#section-7.1.1.1

  @own_context_takeover = !@accept_no_context_takeover &&
                          !@params['server_no_context_takeover']

  response['server_no_context_takeover'] = true unless @own_context_takeover

  # https://tools.ietf.org/html/rfc7692#section-7.1.1.2

  @peer_context_takeover = !@request_no_context_takeover &&
                           !@params['client_no_context_takeover']

  response['client_no_context_takeover'] = true unless @peer_context_takeover

  # https://tools.ietf.org/html/rfc7692#section-7.1.2.1

  @own_window_bits = [ @accept_max_window_bits || MAX_WINDOW_BITS,
                       @params['server_max_window_bits'] || MAX_WINDOW_BITS
                     ].min

  # In violation of the spec, Firefox closes the connection if it does not
  # send server_max_window_bits but the server includes this in its response
  if @own_window_bits < MAX_WINDOW_BITS and @params['server_max_window_bits']
    response['server_max_window_bits'] = @own_window_bits
  end

  # https://tools.ietf.org/html/rfc7692#section-7.1.2.2

  if client_max = @params['client_max_window_bits']
    client_max = MAX_WINDOW_BITS if client_max == true
    @peer_window_bits = [@request_max_window_bits || MAX_WINDOW_BITS, client_max].min
  else
    @peer_window_bits = MAX_WINDOW_BITS
  end

  if @peer_window_bits < MAX_WINDOW_BITS
    response['client_max_window_bits'] = @peer_window_bits
  end

  response
end