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

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

"""
Package containing the various security checker modules.
"""

import collections
import os


def generateCheckersDict():
    """
    Function to generate the dictionary with checkers.
    
    Checker modules are searched for inside this package. Each module
    defining some checks must contain a function 'getChecks()' returning
    a dictionary containing the check type as key and a list of tuples
    with the check function and associated message codes.
    
    @return dictionary containing list of tuples with checker data
    @rtype dict
    """
    checkersDict = collections.defaultdict(list)
    
    checkersDirectory = os.path.dirname(__file__)
    checkerModules = [os.path.splitext(m)[0]
                      for m in os.listdir(checkersDirectory)
                      if m != "__init__.py" and m.endswith(".py")]
    
    for checkerModule in checkerModules:
        modName = "Security.Checks.{0}".format(checkerModule)
        try:
            mod = __import__(modName)
            components = modName.split('.')
            for comp in components[1:]:
                mod = getattr(mod, comp)
        except ImportError:
            continue
        
        if not hasattr(mod, "getChecks"):
            continue
        
        modCheckersDict = mod.getChecks()
        for checktype, checks in modCheckersDict.items():
            checkersDict[checktype].extend(checks)
    
    return checkersDict
