#!/usr/bin/env python

"""
$Id$

Copyright (c) 2006-2012 sqlmap developers (http://www.sqlmap.org/)
See the file 'doc/COPYING' for copying permission
"""

import re

from lib.core.common import randomRange
from lib.core.data import kb
from lib.core.enums import PRIORITY

__priority__ = PRIORITY.NORMAL

def dependencies():
    pass

def tamper(payload):
    """
    Replaces each keyword character with random case value

    Example:
        * Input: INSERT
        * Output: InsERt

    Tested against:
        * Microsoft SQL Server 2005
        * MySQL 4, 5.0 and 5.5
        * Oracle 10g
        * PostgreSQL 8.3, 8.4, 9.0

    Notes:
        * Useful to bypass very weak and bespoke web application firewalls
          that has poorly written permissive regular expressions
        * This tamper script should work against all (?) databases
    """

    retVal = payload

    if payload:
        for match in re.finditer(r"[A-Za-z_]+", retVal):
            word = match.group()

            if word.upper() in kb.keywords:
                newWord = str()

                for i in xrange(len(word)):
                    newWord += word[i].upper() if randomRange(0, 1) else word[i].lower()

                retVal = retVal.replace(word, newWord)

    return retVal