xmlstrfix.py

from twisted.web import proxy, server
import StringIO
import re
from urllib import quote as urlquote
from twisted.application import service, internet

class XMLSTRFixingProxy(proxy.ReverseProxyResource):
    def getChild(self, path, request):
        return XMLSTRFixingProxy(
            self.host, self.port,
            self.path + '/' + urlquote(path, safe=""),
            self.reactor)

    def render(self, request):
        content = ""
        parts = re.split("<XMLstr>(.+?)</XMLstr>", request.content.getvalue())
        for i, part in enumerate(parts):
            if i % 2:
                content += "<XMLstr>" + re.sub('[\x00-\x1F<>="&]', " ", part) + "</XMLstr>"
            else:
                content += part
        request.content = StringIO.StringIO(content)
        return proxy.ReverseProxyResource.render(self, request)

application = service.Application("XMLstr rewriting application")
service = internet.TCPServer(8000, server.Site(XMLSTRFixingProxy('10.0.3.56', 80, '')))
service.setServiceParent(application)