➕ Add passport local strategy

Local strategy handles login/register in one go. No need for 2 routes as we only require username and password.

server/services/passport.js

@@ -0,0 +1,57 @@
+const bcrypt = require('bcrypt')
+const passport = require('passport');
+const LocalStrategy = require('passport-local').Strategy;
+const mongoose = require('mongoose');
+
+const User = mongoose.model('User');
+
+passport.serializeUser(function (user, done) {
+    done(null, user.id);
+});
+
+passport.deserializeUser(function (id, done) {
+    User.findById(id, function (err, user) {
+        done(err, user);
+    });
+});
+
+passport.use('local', new LocalStrategy(
+    {usernameField: 'email'},
+    (email, password, done) => {
+        User.findOne({email: email})
+            .then(user => {
+                if (!user) {
+                    const newUser = new User({email, password});
+                    bcrypt.genSalt(10, (err, salt) => {
+                        bcrypt.hash(newUser.password, salt, (err, hash) => {
+                            if (err) throw err;
+                            newUser.password = hash;
+                            newUser
+                                .save()
+                                .then(user => {
+                                    return done(null, user);
+                                })
+                                .catch(err => {
+                                    return done(null, false, {message: err});
+                                });
+                        });
+                    });
+                } else {
+                    bcrypt.compare(password, user.password, (err, isMatch) => {
+                        if (err) throw err;
+
+                        if (isMatch) {
+                            return done(null, user);
+                        } else {
+                            return done(null, false, {message: 'Wrong password'});
+                        }
+                    });
+                }
+            })
+            .catch(err => {
+                return done(null, false, {message: err});
+            });
+    })
+);
+
+module.exports = passport;