#!/usr/bin/env python

"""
$Id$

Copyright (c) 2006-2010 sqlmap developers (http://sqlmap.sourceforge.net/)
See the file 'doc/COPYING' for copying permission
"""

import re

from xml.sax.handler import ContentHandler

from lib.core.common import checkFile
from lib.core.common import parseXmlFile
from lib.core.common import sanitizeStr
from lib.core.data import kb
from lib.core.data import paths
from lib.core.exception import sqlmapEndSAXParsing
from lib.core.threads import getCurrentThreadData

class htmlHandler(ContentHandler):
    """
    This class defines methods to parse the input HTML page to
    fingerprint the back-end database management system
    """

    def __init__(self, page):
        ContentHandler.__init__(self)

        self.__dbms   = None
        self.__page   = page
        self.__regexp = None
        self.__match  = None

        self.dbms     = None

    def startElement(self, name, attrs):
        if name == "dbms":
            self.__dbms = attrs.get("value")

        if name == "error":
            self.__regexp = attrs.get("regexp")
            self.__match = re.search(self.__regexp, self.__page, re.I)

            if self.__match:
                self.dbms = self.__dbms
                self.__match = None
                threadData = getCurrentThreadData()
                threadData.lastErrorPage = (threadData.lastRequestUID, self.__page)
                raise sqlmapEndSAXParsing

def htmlParser(page):
    """
    This function calls a class that parses the input HTML page to
    fingerprint the back-end database management system
    """

    xmlfile = paths.ERRORS_XML
    checkFile(xmlfile)
    page = sanitizeStr(page)
    handler = htmlHandler(page)

    try:
        parseXmlFile(xmlfile, handler)
    except sqlmapEndSAXParsing:
        pass

    if handler.dbms and handler.dbms not in kb.htmlFp:
        kb.lastParserStatus = handler.dbms
        kb.htmlFp.append(handler.dbms)
    else:
        kb.lastParserStatus = None

    return handler.dbms