bookshelf/storage.py [34:53]:
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def _safe_filename(filename):
    """
    Generates a safe filename that is unlikely to collide with existing
    objects in Google Cloud Storage.

    ``filename.ext`` is transformed into ``filename-YYYY-MM-DD-HHMMSS.ext``
    """
    filename = secure_filename(filename)
    date = datetime.datetime.utcnow().strftime("%Y-%m-%d-%H%M%S")
    basename, extension = filename.rsplit('.', 1)
    return "{0}-{1}.{2}".format(basename, date, extension)


def upload_file(file_stream, filename, content_type):
    """
    Uploads a file to a given Cloud Storage bucket and returns the public url
    to the new object.
    """
    _check_extension(filename, current_app.config['ALLOWED_EXTENSIONS'])
    filename = _safe_filename(filename)
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optional-kubernetes-engine/bookshelf/storage.py [38:57]:
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def _safe_filename(filename):
    """
    Generates a safe filename that is unlikely to collide with existing objects
    in Google Cloud Storage.

    ``filename.ext`` is transformed into ``filename-YYYY-MM-DD-HHMMSS.ext``
    """
    filename = secure_filename(filename)
    date = datetime.datetime.utcnow().strftime("%Y-%m-%d-%H%M%S")
    basename, extension = filename.rsplit('.', 1)
    return "{0}-{1}.{2}".format(basename, date, extension)


def upload_file(file_stream, filename, content_type):
    """
    Uploads a file to a given Cloud Storage bucket and returns the public url
    to the new object.
    """
    _check_extension(filename, current_app.config['ALLOWED_EXTENSIONS'])
    filename = _safe_filename(filename)
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