def strictNamespaceMappingEnvarParse(envar=None):
    """Custom format STRICT_NAMESPACE_MAPPING env variable parsing.

    Note:
        STRICT_NAMESPACE_MAPPING value example: 'frontend.develop.example.com:develop,frontend.staging.example.com:staging'
        No spaces or special chars.
    """

    if envar:
        items = envar.split(',')
        mapdict = {}
        for item in items:
            mapdict[item.split(':')[0]] = item.split(':')[1]
        return mapdict
    return None