rf-web/vendor/bundle/gems/em-websocket-0.5.1/lib/em-websocket/handshake04.rb
2019-10-21 10:18:17 +02:00

29 lines
805 B
Ruby

require 'digest/sha1'
require 'base64'
module EventMachine
module WebSocket
module Handshake04
def self.handshake(headers, _, __)
# Required
unless key = headers['sec-websocket-key']
raise HandshakeError, "sec-websocket-key header is required"
end
string_to_sign = "#{key}258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
signature = Base64.encode64(Digest::SHA1.digest(string_to_sign)).chomp
upgrade = ["HTTP/1.1 101 Switching Protocols"]
upgrade << "Upgrade: websocket"
upgrade << "Connection: Upgrade"
upgrade << "Sec-WebSocket-Accept: #{signature}"
# TODO: Support sec-websocket-protocol
# TODO: sec-websocket-extensions
return upgrade.join("\r\n") + "\r\n\r\n"
end
end
end
end