Is Scala/Java not respecting w3 “excess dtd traffic” specs?

Question

I\'m new to Scala, so I may be off base on this, I want to know if the problem is my code. Given the Scala file httpparse, simplified to:

object Http {
   import         


        

Answer 1

Without addressing, for now, the problem, what do you expect to happen if the function request return false below?

def fetchAndParseURL(URL:String) = {      
  val (true, body) = Http request(URL)

What will happen is that an exception will be thrown. You could rewrite it this way, though:

def fetchAndParseURL(URL:String) = (Http request(URL)) match {      
  case (true, body) =>      
    val xml = XML.load(body)
    "True"
  case _ => "False"
}

Now, to fix the XML parsing problem, we'll disable DTD loading in the parser, as suggested by others:

def fetchAndParseURL(URL:String) = (Http request(URL)) match {      
  case (true, body) =>
    val f = javax.xml.parsers.SAXParserFactory.newInstance()
    f.setNamespaceAware(false)
    f.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
    val MyXML = XML.withSAXParser(f.newSAXParser())
    val xml = MyXML.load(body)
    "True"
  case _ => "False"
}

Now, I put that MyXML stuff inside fetchAndParseURL just to keep the structure of the example as unchanged as possible. For actual use, I'd separate it in a top-level object, and make "parser" into a def instead of val, to avoid problems with mutable parsers:

import scala.xml.Elem
import scala.xml.factory.XMLLoader
import javax.xml.parsers.SAXParser
object MyXML extends XMLLoader[Elem] {
  override def parser: SAXParser = {
    val f = javax.xml.parsers.SAXParserFactory.newInstance()
    f.setNamespaceAware(false)
    f.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
    f.newSAXParser()
  }
}

Import the package it is defined in, and you are good to go.