将自定义中间件安装到hubot的express中

有没有办法将我自己的自定义中间件安装到hubot提供的express对象中

我想使用这样的代码，但我从未看到添加中间件或初始化express的消息。我用我找到的代码作为模型

我能以某种方式覆盖吗？或者，有没有一种方法可以将Robot子类化来实现这一点

    # Setup our own express handler                                                                                                                                                        
    express = require 'express'
    robot.express = app = express()
    app.use require 'body-parser'

    app.use (req, res, next) ->
            robot.logger.info "Added middleware"
            req.rawData = ''
            req.on 'data', (chunk) ->
                    req.rawData += chunk

            req.on 'end', () ->
                    next()


    robot.logger.info "Setting up new express module"

    robot.emit 'express-loaded', @
    @loaded = true

    @init = (port, bindAddress) =>
            robot.logger.info "Initializing express"
            unless @initialized
                    try
                            @server = app.listen( port || process.env.PORT || 8080, bindAddress || process.env.BIND_ADDRESS || '0.0.0.0' )
                            @router = app
                            @initialized = true
                    catch err
                            robot.logger.error "Error trying to load"
                            process.exit 1
            @

我在这件事上提出了一个错误。