http-info.coffee

request = require('request')
cheerio = require('cheerio')
iconv = require('iconv-jp')

module.exports = (robot) ->

  robot.hear /http(s?):\/\/(.*)/i, (msg) ->
    url = msg.match[0]

    unless url.match(/\.(png|jpg|jpeg|gif|txt|zip|tar\.bz|js|css)/) # filter out some common files from trying
      request url: url, encoding: null, (error, response, body) ->
        if 200 <= response.statusCode < 300
          charset = response.headers['content-type']?.match(/charset=([\w\-]+)/)?[1]
          charset = body.toString('binary').match(/charset=([\w\-]+)/)?[1] unless charset?

          if charset?
            converter = new iconv.Iconv(charset, 'UTF-8//IGNORE')
            body = converter.convert(body).toString()

          $ = cheerio.load(body)
          title = $('title').text()
          description = $('meta[name=description]').attr("content")

          send = (s) ->
            msg.send s.replace(/^\s+|\s+$|\r|\n/g, "") if s

          send title
          send description