How to bind or pass req parameter to Passport.js JWT Strategy? - node.js

Question

I want to store information in the database when user is authenticated. The information is coming form the client in the request. The following code throws error, saying req is not defined.
Controller:
exports.verifySession = async function(req, res, next) {
let responses = [];
passport.authenticate('jwt', async (error, result) => {
if (error) {
email.sendError(res, error);
} else if (result === false) {
responses.push(new CustomResponse(1).get());
return res.status(422).json({ data: { errors: responses } });
}
if (result.SessionToken) {
return res.status(200).json('valid');
} else {
return res.status(401).json();
}
})(req, res, next);
};
And passport.js:
passport.use(
new JWTstrategy(
{
// We expect the user to send the token as a query paramater with the name 'token'
jwtFromRequest: ExtractJWT.fromAuthHeaderAsBearerToken(),
// Secret we used to sign our JWT
secretOrKey: config.jwtkey
},
async (token, done) => {
console.log(req.body);
try {
const user = new User();
user.UserID = token.user.UserID;
user.SessionToken = token.user.SessionToken;
user.SessionDate = token.user.SessionDate;
user.ProviderID = token.user.ProviderID;
// Verify session token
await user.verifySessionToken(user, async (error, result) => {
if (error) {
return done(error);
} else if (result.returnValue === 0) {
return done(null, token.user);
} else if (result.returnValue !== 0) {
return done(null, result);
}
});
} catch (error) {
done(error);
}
}
)
);

Answer 1

You can use passReqToCallback feature of passport to pass your request body to passport.
From passport.js official docs :
The JWT authentication strategy is constructed as follows:
new JwtStrategy(options, verify)
options is an object literal
containing options to control how the token is extracted from the
request or verified.
...
...
passReqToCallback: If true the request will be passed to the verify
callback. i.e. verify(request, jwt_payload, done_callback).
You can try this:
passport.use(new JWTstrategy({
// We expect the user to send the token as a query paramater with the name 'token'
jwtFromRequest: ExtractJWT.fromAuthHeaderAsBearerToken(),
// Secret we used to sign our JWT
secretOrKey: config.jwtkey,
//this will help you to pass request body to passport
passReqToCallback: true
}, async (req, token,done) => {
//req becomes the first parameter
// now you can access req.body here
})
Note: req becomes the first parameter of callback function instead of token, when you use passReqToCallback