How to decode and verify password in feathers js - node.js

Question

I am new to feathersJs and trying to learn how to perform authentication using hooks and services. I am using Couchdb database and cradle.
This is the post method to encrypt password in hashPassword using "users" hooks service. The post method is as below:
app.post('/dev',function(req,res,next){
var username = req.body.username;
var password = req.body.password;
app.service('database').create({username,password}).then(user => {
db.save(user, function (err, docs) {
// Handle response
res.json(docs);
});
console.log('User Created Successfully.', user);
}).catch(console.error);
})
and service is:
app.service('authentication').hooks({
before: {
create: [
// You can chain multiple strategies
auth.hooks.authenticate(['jwt', 'local'])
],
remove: [
auth.hooks.authenticate('jwt')
]
}
});
app.service('database').hooks({
before: {
find: [
auth.hooks.authenticate('jwt')
],
create: [
local.hooks.hashPassword({ passwordField: 'password' })
]
}
});
now i am using this to retrive data :
app.post('/devget',function(req,res,next){
var User = {
username: req.body.username,
password: req.body.password
};
app.service('dataget').find(User).then(user => {
db.view('byuser/user',{key: User.username}, function (err, docs) {
// Handle response
res.json(docs);
});
console.log('User Get Successfully.', user);
}).catch(console.error);
})
this will give me data in response as:
Response [
{ id: '060ab48a4826da7125d8ae45350037ee',
key: 'w',
value:
{ _id: '060ab48a4826da7125d8ae45350037ee',
_rev: '1-ea9a18d3724ce4542019dc5752c1fd4d',
username: 'w',
password: '$2a$10$yBJVJTmVXfTk0V4CCiWkd.GvAZZB9dF2pckKJ9wb/lJcAK8Ou.v06',
id: 0 } } ]
this works fine and password is encrypted but i am not getting how to decrypt password and authenticate user.
Note: i just want o do it with hooks and services or custom service or class but not using passport.

Answer 1

You do not decrypt the password; you compare the encrypted password to a function that will encrypt the password (after you've found the user to make a password comparison to).
const bcrypt = require('bcryptjs');
var hash = bcrypt.hashSync("bacon");
bcrypt.compareSync("bacon", hash); // true
bcrypt.compareSync("veggies", hash); // false

Answer 2

I would use the comparePassword function in this file
https://github.com/feathersjs/feathers/blob/be5d8df3b7afa39852ff1b5643676d9140ba8203/packages/authentication-local/src/strategy.ts#L94
Based on that you could write a hook and consider contributing it to the feathersJS project.