Custom error In Graphql Query Response

[gauravmakkar]

How can I respond with custom Errors while querying:

app.use('/graphql', graphqlExpress((req) => {

    return new Promise((resolve,reject) => {
        

        let user;
        let loader = Loader()
        if(!req.headers['authentication-token'] || true){
            throw new ErrorResponse([{key: 'authentication', message: 'Authentication Token is not 
            provided' }]);

        }



        req.session.reload(function (err) {
            let base_context = {
                orders: orders,
                users: users,
                ppsList:ppsList,
                auth_token: req.headers['authentication-token']
            }
            if (err) {
                loader.CurrentUserLoader(req.headers['authentication-token']).load(req.headers['authentication-token']).then(function (res) {
                    if(!res){
                        throw new ErrorResponse([{key: 'authentication', message: 'Authentication failure' }]);
                    }
                    req.session.current_user = res
                    logger.info("Session Created for user: " + res.name)
                    Object.assign(base_context, {current_user: req.session.current_user});
                    resolve({
                        schema,
                        tracing: true,
                        cacheControl: true,
                        context: base_context,
                        
                    })
                });

            } else {
                logger.info("Session Stored for the user: " + req.session.current_user.name);
                Object.assign(base_context, {current_user: req.session.current_user});
                resolve({
                    schema,
                    tracing: true,
                    cacheControl: true,
                    context: base_context,
                })

            }

        })


    })
}));

[bjagadeesan]

You can use this repo to throw custom errors.
https://www.npmjs.com/package/apollo-errors
It works well with Apollo graphql.

I see that you are doing authentication. As far as I know, there are two methods to do authorization,
1)manually checking for authentication in each resolver.
2)using directives as middleware as explained here.
ardatan/graphql-tools#212
which is pushed to graphql-tools but it is limiting.

Please Note:
The method 2 using directive is limiting as it DOES NOT work on QUERIES, but rather only work on FIELD_DESCRIPTIONS.

[abernix]

👋 I'll close this since it's quite old and also doesn't appear to be a bug with Apollo Server, but rather a question about how to use it or one of its components.

For more on error handling, check out the documentation for errors.

Rather than asking it here in GitHub Issues — where efforts are focused on fixing bugs and adding new features — I'd ask that you take this question to the Apollo Server channel within the Apollo community on Spectrum.chat where there are community members who might be able to relate to a similar problem, or might be able to help you out more interactively. Thanks for your understanding!