class Github::Request::Jsonize

def call(env)
  if request_with_body?(env)
    env[:request_headers][CONTENT_TYPE] ||= MIME_TYPE
    env[:body] = encode_body env unless env[:body].respond_to?(:to_str)
  end
  @app.call env
end

def encode_body(env)
  if MultiJson.respond_to?(:dump)
    MultiJson.dump env[:body]
  else
    MultiJson.encode env[:body]
  end
end

def has_body?(env)
  body = env[:body] and !(body.respond_to?(:to_str) and body.empty?)
end

def request_type(env)
  type = env[:request_headers][CONTENT_TYPE].to_s
  type = type.split(';', 2).first if type.index(';')
  type
end

def request_with_body?(env)
  type = request_type(env)
  has_body?(env) and (type.empty? or type == MIME_TYPE)
end