#!/usr/bin/env python

"""
Copyright (c) 2006-2018 sqlmap developers (http://sqlmap.org/)
See the file 'LICENSE' for copying permission
"""

try:
    import cx_Oracle
except:
    pass

import logging
import os
import re

from lib.core.convert import utf8encode
from lib.core.data import conf
from lib.core.data import logger
from lib.core.exception import SqlmapConnectionException
from plugins.generic.connector import Connector as GenericConnector

os.environ["NLS_LANG"] = ".AL32UTF8"

class Connector(GenericConnector):
    """
    Homepage: https://oracle.github.io/python-cx_Oracle/
    User https://cx-oracle.readthedocs.io/en/latest/
    API: https://wiki.python.org/moin/DatabaseProgramming
    License: https://cx-oracle.readthedocs.io/en/latest/license.html#license
    """

    def __init__(self):
        GenericConnector.__init__(self)

    def connect(self):
        self.initConnection()
        self.__dsn = cx_Oracle.makedsn(self.hostname, self.port, self.db)
        self.__dsn = utf8encode(self.__dsn)
        self.user = utf8encode(self.user)
        self.password = utf8encode(self.password)

        try:
            self.connector = cx_Oracle.connect(dsn=self.__dsn, user=self.user, password=self.password, mode=cx_Oracle.SYSDBA)
            logger.info("successfully connected as SYSDBA")
        except (cx_Oracle.OperationalError, cx_Oracle.DatabaseError, cx_Oracle.InterfaceError), ex:
            if "Oracle Client library" in str(ex):
                msg = re.sub(r"DPI-\d+:\s+", "", str(ex))
                msg = re.sub(r': ("[^"]+")', r" (\g<1>)", msg)
                msg = re.sub(r". See (http[^ ]+)", r'. See "\g<1>"', msg)
                raise SqlmapConnectionException(msg)

            try:
                self.connector = cx_Oracle.connect(dsn=self.__dsn, user=self.user, password=self.password)
            except (cx_Oracle.OperationalError, cx_Oracle.DatabaseError, cx_Oracle.InterfaceError), msg:
                raise SqlmapConnectionException(msg)

        self.initCursor()
        self.printConnected()

    def fetchall(self):
        try:
            return self.cursor.fetchall()
        except cx_Oracle.InterfaceError, msg:
            logger.log(logging.WARN if conf.dbmsHandler else logging.DEBUG, "(remote) %s" % msg)
            return None

    def execute(self, query):
        retVal = False

        try:
            self.cursor.execute(utf8encode(query))
            retVal = True
        except cx_Oracle.DatabaseError, msg:
            logger.log(logging.WARN if conf.dbmsHandler else logging.DEBUG, "(remote) %s" % msg)

        self.connector.commit()

        return retVal

    def select(self, query):
        retVal = None

        if self.execute(query):
            retVal = self.fetchall()

        return retVal