1

I am creating a set of API endpoints for a mobile app using Rest. For User authentication, I am using the default API endpoints supplied by Drupal. That would be

/user/logout?_format=json&token=<logout_token obtained from login api response.>

I wanted to remove the _format=json from the URL parameter and so I created a custom route with the existing controller just for this purpose. However, I am getting an error.

"'csrf_token' URL query argument is invalid

I am not able to figure out how to remove this error. I had added a csrf_token as an additional parameter with the one I got from successful login. It seems however that the csrf token being validated against is generated somewhere else.

I can remove this error by removing the csrf token entry from the routing file entry but that would be a security violation. How do we fix this error or is there a better way to handle the user logout api endpoint.

3

To get the right csrf_token you should first request /session/token this route coming from system.routing.yml so in your controller action add those two things:

  1. Get the system csrf_token from /session/token
  2. Add your csrf token to header request as X-CSRF-Token

Update: If you are using rest module you should get the csrf token from /rest/session/token instead of /session/token

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  • Hi. I've tried this solution but It doesn't work for me. I always get the error. I've tried with csrf-token got on login and with the one requested with session/token, but none of them work. Always the same error.
    – briast
    Jun 1 at 15:56
2

You can use POST method on /user/logout without params and token, the cookie will be deleted so the user will be logged out, but in the server-side Drupal will not destroy the session, so you'll end up by having a lot of unused sessions...

I wonder why do you want to remove the _format=json from the URL ?

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  • 1
    I wanted to provide a cleaner url. The _format=json is not required in our case as it is a partially decoupled system. The parameter is only to differentiate between HTML and JSON logins which is useful for stock Drupal site but looks bad in our case. I am using post method but I am always getting csrf error.
    – Binny
    May 29 '20 at 4:42

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