sails.js JSON web token authentication with Sails Configuration

Example

Step one

We need to create a service called jwToken. Go to api/services directory and create jwToken.js.

'use strict';

const jwt = require('jsonwebtoken'),
      tokenSecret = "secretissecret";

module.exports = {
  // Generates a token from supplied payload
  issue(payload) {
    return jwt.sign(
      payload,
      tokenSecret, // Token Secret that we sign it with
      {
        expiresIn: "30 days" // Token Expire time
      });
  },

  // Verifies token on a request
  verify(token, callback) {
    return jwt.verify(
      token, // The token to be verified
      tokenSecret, // Same token we used to sign
      {}, // No Option, for more see https://github.com/auth0/node-jsonwebtoken#jwtverifytoken-secretorpublickey-options-callback
      callback //Pass errors or decoded token to callback
    );
  }
};

Step two

Encrypt our password using bcrypt. Go to api/models/User.js.

'use strict';
const bcrypt = require('bcrypt');

module.exports = {

    attributes: {
        // your code...
    },

    // Here we encrypt password before creating a User
    beforeCreate(values, next) {
        bcrypt.genSalt(10, (err, salt) => {
            if (err) {
                sails.log.error(err);
                return next();
            }

            bcrypt.hash(values.password, salt, (err, hash) => {
                if (err) {
                    sails.log.error(err);
                    return next();
                }
                values.encryptedPassword = hash; // Here is our encrypted password
                return next();
            });
        });
    },

    comparePassword(password, encryptedPassword) {

        return new Promise(function(resolve, reject) {
            bcrypt.compare(password, encryptedPassword, (err, match) => {
                if (err) {
                    sails.log.error(err);
                    return reject("Something went wrong!");
                }
                if (match) return resolve();
                else return reject("Mismatch passwords");
            });
        });
    }
};

Step three

Create isAuthorized policy to check if a user has valid token in the request header. Go to api/policies and create isAuthorized.js.

'use strict';

module.exports = (req, res, next) => {
  let token;


  if (req.headers && req.headers.token) {
    token = req.headers.token;
    if (token.length <= 0) return res.json(401, {err: 'Format is Authorization: Bearer [token]'});

  } else if (req.param('token')) {
    token = req.param('token');
    // We delete the token from param to not mess with blueprints
    delete req.query.token;
  } else {
    return res.json(401, {err: 'No Authorization header was found'});
  }

  jwToken.verify(token, function (err, token) {
    if (err) return res.json(401, {err: 'Invalid Token!'});
    req.token = token; // This is the decrypted token or the payload you provided
    next();
  });
};

Step four

We use config/policies.js to protect our controllers

module.exports.policies = {

  '*': ['isAuthorized'], // Everything resctricted here
  'UserController': { // Name of your controller
    'create': true // We dont need authorization here, allowing public access
  }
};

Step five

Let's test our implementation. Go to api/controllers and create UserController.js

'use strict';

module.exports = {
    create(req, res) {
        const data = req.body;
        if (data.password !== data.confirmPassword) return res.badRequest("Password not the same");

        User.create({
                email: data.email,
                password: data.password,
                name: data.name
                    //etc...
            })
            .then((user) => {
                res.send({ token: jwToken.issue({ id: user.id }) }); // payload is { id: user.id}
            })
            .catch((err) => {
                sails.log.error(err);
                return res.serverError("Something went wrong");
            });
    },

    login(req, res) {
        const data = req.body;

        if (!data.email || !data.password) return res.badRequest('Email and password required');

        User.findOne({ email: email })
            .then((user) => {
                if (!user) return res.notFound();

                User.comparePassword(password, user.password)
                    .then(() => {
                        return res.send({ token: jwToken.issue({ id: user.id }) })
                    })
                    .catch((err) => {
                        return res.forbidden();
                    });
            })
            .catch((err) => {
                sails.log.error(err);
                return res.serverError();
            });
    }
};