expired jwt token is throwing HttpException when using sockets

[alfredvaa]

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[ ] Regression 
[x] Bug report
[ ] Feature request
[x] Documentation issue or request
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Current behavior

I am using guards in a Gateway, and together with that, the passport jwt strategy from the documentation example.

Using a custom extractor I am able to send the jwt as a query parameter with the initial socket request to be authenticated:

const fromSocketQueryParameter = (request) => {
  const rawUrl = request.url || request.handshake.url;
  let token = null;
  const parsed_url = url.parse(rawUrl, true);

  if (parsed_url.query && Object.prototype.hasOwnProperty.call(parsed_url.query, 'token')) {
    token = parsed_url.query['token'];
  }
  return token;
}

There is a problem when the token has expired which is that UnauthorizedException is thrown within @nestjs/passport/options.js and that one is extending HttpException. This causes an internal server error to be visible to the client because in @nestjs/websockets all errors that are not WsExceptions is returning internal server error.

Expected behavior

Is it possible to override or catch the error thrown when the jwt token is not valid? I would like to throw a WsException instead.

It would also be useful if this could be handled in the validate action within the strategy, but that one seems to be called after the actual verification of the jwt token, meaning that the error has already been thrown.

Minimal reproduction of the problem with instructions

What is the motivation / use case for changing the behavior?

It is not possible to handle expired access when using sockets, which it should be.

Environment

Nest version: 5.1.0

 
For Tooling issues:
- Node version: 10.6.0  
- Platform: Mac, Ubuntu  

Others:

[kamilmysliwiec]

See here: https://docs.nestjs.com/techniques/authentication (Inheritance chapter).
You should be able to extend default implementation, override handleRequest() method and throw an expected error easily.

[alfredvaa]

handleRequest is not called, is that supposed to be? I just took the exact same code as in the article you referred to, and using the guard like this: @UseGuards(JwtAuthGuard)