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"""
This module provides means to detect the App Engine environment.
"""

import os


def is_appengine():
    return is_local_appengine() or is_prod_appengine() or is_prod_appengine_mvms()


def is_appengine_sandbox():
    return is_appengine() and not is_prod_appengine_mvms()


def is_local_appengine():
    return (
        "APPENGINE_RUNTIME" in os.environ
        and "Development/" in os.environ["SERVER_SOFTWARE"]
    )


def is_prod_appengine():
    return (
        "APPENGINE_RUNTIME" in os.environ
        and "Google App Engine/" in os.environ["SERVER_SOFTWARE"]
        and not is_prod_appengine_mvms()
    )


def is_prod_appengine_mvms():
    return os.environ.get("GAE_VM", False) == "true"