HTML packer in a few lines of scala

packer.scala

    // TODO: Replace with an off-the-shelf Java HTML packer
    val doc = Jsoup.parse(html)
    doc.select("link") // Replace CSS
      .filter(link => "stylesheet".equalsIgnoreCase(link.attr("rel")))
      .filter(link => new URI(link.attr("href")).getHost == null)
      .foreach(link => {
        val el = new Element(Tag.valueOf("style"), "")
        val css = getResourceAsString(new URI(link.attr("href")).getPath)
        val m = cssUrlPattern.matcher(css)
        val s = new StringBuffer()
        while (m.find()) {
          val ext = FilenameUtils.getExtension(m.group(1))
          val writer = new StringWriter()
          val stream = getClass.getResourceAsStream(m.group(1))
          IOUtils.copy(new Base64InputStream(stream, true, 0, Array[Byte]()), writer)
          stream.close()
          m.appendReplacement(s, s"url(data:image/$ext;base64,${writer.toString})")
        }
        m.appendTail(s)
        el.appendChild(new DataNode(s.toString, ""))
        link.replaceWith(el)
      })
    doc.select("script") // Replace JavaScript
      .filter(script => "".equals(script.attr("type")) || "text/javascript".equalsIgnoreCase(script.attr("type")))
      .filter(script => script.attr("src").length > 0)
      .filter(script => new URI(script.attr("src")).getHost == null)
      .foreach(script => {
        val js = getResourceAsString(script.attr("src"))
        script.removeAttr("src")
        script.attr("type", "text/javascript")
        script.appendChild(new DataNode(js, ""))
      })
    doc.select("script") // Replace JSON
      .filter(script => "application/json".equalsIgnoreCase(script.attr("type")))
      .filter(script => script.attr("src").length > 0)
      .filter(script => new URI(script.attr("src")).getHost == null)
      .foreach(script => {
        script.removeAttr("src")
        script.appendChild(new DataNode(data, ""))
      })
    html = doc.toString