#!/usr/bin/env python

"""
Copyright (c) 2006-2019 sqlmap developers (http://sqlmap.org/)
See the file 'LICENSE' for copying permission
"""

import imp
import logging
import os
import sys
import traceback
import warnings

_sqlalchemy = None
try:
    f, pathname, desc = imp.find_module("sqlalchemy", sys.path[1:])
    _ = imp.load_module("sqlalchemy", f, pathname, desc)
    if hasattr(_, "dialects"):
        _sqlalchemy = _
        warnings.simplefilter(action="ignore", category=_sqlalchemy.exc.SAWarning)
except ImportError:
    pass

try:
    import MySQLdb  # used by SQLAlchemy in case of MySQL
    warnings.filterwarnings("error", category=MySQLdb.Warning)
except ImportError:
    pass

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

def getSafeExString(ex, encoding=None):  # Cross-referenced function
    raise NotImplementedError

class SQLAlchemy(GenericConnector):
    def __init__(self, dialect=None):
        GenericConnector.__init__(self)
        self.dialect = dialect

    def connect(self):
        if _sqlalchemy:
            self.initConnection()

            try:
                if not self.port and self.db:
                    if not os.path.exists(self.db):
                        raise SqlmapFilePathException("the provided database file '%s' does not exist" % self.db)

                    _ = conf.direct.split("//", 1)
                    conf.direct = "%s////%s" % (_[0], os.path.abspath(self.db))

                if self.dialect:
                    conf.direct = conf.direct.replace(conf.dbms, self.dialect, 1)

                if self.dialect == "sqlite":
                    engine = _sqlalchemy.create_engine(conf.direct, connect_args={"check_same_thread": False})
                elif self.dialect == "oracle":
                    engine = _sqlalchemy.create_engine(conf.direct)
                else:
                    engine = _sqlalchemy.create_engine(conf.direct, connect_args={})

                self.connector = engine.connect()
            except (TypeError, ValueError):
                if "_get_server_version_info" in traceback.format_exc():
                    try:
                        import pymssql
                        if int(pymssql.__version__[0]) < 2:
                            raise SqlmapConnectionException("SQLAlchemy connection issue (obsolete version of pymssql ('%s') is causing problems)" % pymssql.__version__)
                    except ImportError:
                        pass
                elif "invalid literal for int() with base 10: '0b" in traceback.format_exc():
                    raise SqlmapConnectionException("SQLAlchemy connection issue ('https://bitbucket.org/zzzeek/sqlalchemy/issues/3975')")
                raise
            except SqlmapFilePathException:
                raise
            except Exception as ex:
                raise SqlmapConnectionException("SQLAlchemy connection issue ('%s')" % getSafeExString(ex))

            self.printConnected()
        else:
            raise SqlmapMissingDependence("SQLAlchemy not available")

    def fetchall(self):
        try:
            retVal = []
            for row in self.cursor.fetchall():
                retVal.append(tuple(row))
            return retVal
        except _sqlalchemy.exc.ProgrammingError as ex:
            logger.log(logging.WARN if conf.dbmsHandler else logging.DEBUG, "(remote) %s" % getSafeExString(ex))
            return None

    def execute(self, query):
        try:
            self.cursor = self.connector.execute(query)
        except (_sqlalchemy.exc.OperationalError, _sqlalchemy.exc.ProgrammingError) as ex:
            logger.log(logging.WARN if conf.dbmsHandler else logging.DEBUG, "(remote) %s" % getSafeExString(ex))
        except _sqlalchemy.exc.InternalError as ex:
            raise SqlmapConnectionException(getSafeExString(ex))

    def select(self, query):
        self.execute(query)
        return self.fetchall()
