Signed Url is working after the expiration date Cloud Storage python

Question

I have found this question that seems dead so i will add more context.

i am using the python google-cloud-storage sdk to generate signed urls using blob.generated_signed_url().

Here is the full method i use :

blob.generate_signed_url(expiration=datetime.now() + timedelta(minutes=1), version="v4")

I live in France so my Timezone is +1h from datetime.now().

The generated URL looks fine, i see the part of the expiration and the date : X-Goog-Date=20230318T191451Z&X-Goog-Expires=3659

But now it’s 20min after this delay and the doc is still available.

Note : I have also tried using timedelta(hours=1, minutes=1) to simulate the France Timezone but it is still available also after 2mins of waiting.

What I am doing wrong ?

Asked By: Tom3652

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Answer 1

From the documentation,

X-Goog-Expires: The length of time the signed URL remained valid, measured in seconds from the value in X-Goog-Date.

In your case, it’s 3659 that’s roughly an hour and not a minute. Try:

url = blob.generate_signed_url(
    version="v4",
    expiration=datetime.timedelta(minutes=1),
    method="GET",
)

This should work irrespective of your timezone as it’s using a timedelta instance so timedelta(hours=1, minutes=1) would be 61 minutes. Timezone should be concern if you are using datetime instance instead as mentioned in the API reference:

If a datetime instance is passed without an explicit tzinfo set, it will be assumed to be UTC.

Answered By: Dharmaraj

Signed Url is working after the expiration date Cloud Storage python

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