How to get access token if refresh token lifetime is expired in django

In Django using the Simple JWT library, you can obtain a new access token if the refresh token lifetime has expired by making a request to the token refresh endpoint. Here's an example:

Obtain the initial access token and refresh token:

Make a POST request to the token obtain endpoint (/api/token/) with the user's credentials.
Retrieve the access token and refresh token from the response.
Store the access token and refresh token securely on the client-side, such as in a cookie or local storage.

When the access token expires:

Check if the refresh token is still valid. If the refresh token has also expired, the user will need to re-authenticate and obtain a new set of tokens.
If the refresh token is still valid:

Make a POST request to the token refresh endpoint (/api/token/refresh/) with the expired refresh token.
Retrieve the new access token from the response.
Replace the expired access token with the new access token in the client-side storage.
Here's an example using Python's requests library to demonstrate the process:

import requests

# Function to refresh the access token
def refresh_access_token(refresh_token):
    url = 'http://localhost:8000/api/token/refresh/'
    data = {
        'refresh': refresh_token
    }
    response = requests.post(url, data=data)
    response_data = response.json()
    access_token = response_data['access']
    return access_token


# Usage example
expired_refresh_token = '...'  # Replace with the expired refresh token
new_access_token = refresh_access_token(expired_refresh_token)
print(new_access_token)  # Use the new access token for further requests

Make sure to replace 'http://localhost:8000/api/token/refresh/' with the actual URL of your token refresh endpoint, and handle any necessary error checking and validation in your code.

By calling the token refresh endpoint with the expired refresh token, you can obtain a new access token, allowing the user to continue making authenticated requests without re-authentication.

Get access token if refresh token is invalid

In Django using the Simple JWT library, if the refresh token is invalid (e.g., expired or revoked), you will need to re-authenticate the user to obtain a new set of access and refresh tokens. Here's an example of how to handle this situation:

Attempt to refresh the access token:

Make a POST request to the token refresh endpoint (/api/token/refresh/) with the refresh token.
Check the response status code.
If the status code is 200, the refresh token is valid, and you can retrieve the new access token from the response.
If the status code is 401 (Unauthorized) or any other error status code, it indicates that the refresh token is invalid.
If the refresh token is invalid:

Prompt the user to re-authenticate.
Obtain the new access and refresh tokens by following the authentication process (e.g., username/password or other authentication method).
Store the new tokens securely on the client-side.
Here's an example using Python's requests library to demonstrate the process:

import requests

# Function to refresh the access token
def refresh_access_token(refresh_token):
    url = 'http://localhost:8000/api/token/refresh/'
    data = {
        'refresh': refresh_token
    }
    response = requests.post(url, data=data)
    if response.status_code == 200:
        response_data = response.json()
        access_token = response_data['access']
        return access_token
    else:
        return None

# Usage example
refresh_token = '...'  # Replace with the refresh token
new_access_token = refresh_access_token(refresh_token)
if new_access_token:
    print(new_access_token)  # Use the new access token for further requests
else:
    print("Refresh token is invalid. Re-authenticate the user.")

Make sure to replace 'http://localhost:8000/api/token/refresh/' with the actual URL of your token refresh endpoint, and handle any necessary error checking and validation in your code.

By checking the response status code of the token refresh request, you can determine if the refresh token is valid or not. If it's invalid, you can prompt the user to re-authenticate to obtain a new set of tokens.