# -*- coding: utf-8 -*-

# Copyright (c) 2020 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing checks for the use of yaml load functions.
"""

#
# This is a modified version of the one found in the bandit package.
#
# Original Copyright (c) 2016 Rackspace, Inc.
#
# SPDX-License-Identifier: Apache-2.0
#


def getChecks():
    """
    Public method to get a dictionary with checks handled by this module.
    
    @return dictionary containing checker lists containing checker function and
        list of codes
    @rtype dict
    """
    return {
        "Call": [
            (checkYamlLoad, ("S506",)),
        ],
    }


def checkYamlLoad(reportError, context, config):
    """
    Function to check for the use of of yaml load functions.
    
    @param reportError function to be used to report errors
    @type func
    @param context security context object
    @type SecurityContext
    @param config dictionary with configuration data
    @type dict
    """
    imported = context.isModuleImportedExact('yaml')
    qualname = context.callFunctionNameQual
    if not imported and isinstance(qualname, str):
        return
    
    qualnameList = qualname.split('.')
    func = qualnameList[-1]
    if all([
            'yaml' in qualnameList,
            func == 'load',
            not context.checkCallArgValue('Loader', 'SafeLoader'),
            not context.checkCallArgValue('Loader', 'CSafeLoader'),
    ]):
        reportError(
            context.node.lineno - 1,
            context.node.col_offset,
            "S506",
            "M",
            "H"
        )
