text: const JwtStrategy = require('passport-jwt').Strategy;
  const ExtractJwt = require('passport-jwt').ExtractJwt;
  const mongoose = require('mongoose');
  
  const User = mongoose.model('users');
  const keys = require('./keys.js');
  
  const opts = {};
  opts.jwtFromRequest = ExtractJwt.fromAuthHeaderAsBearerToken();
  opts.secretOrKey = keys.secretOrKey;
  
  module.exports = passport => {
    passport.use(
      new JwtStrategy(opts, (jwt_payload, done) => {
        User.findById(jwt_payload.id)
          .then(user => {
            if (user) {
              return done(null, user)
            }
            
            return done(null, false)
          })
          .catch(err => console.log(err))
      })
    );
  };
  