auth using google

config/index.js

@@ -10,6 +10,12 @@ const production = {
       process.env.MONGODB_URI ||
       'mongodb://localhost/todolist',
   },
+  googleOAuth: {
+    googleEnabled: process.env.GOOGLE_ENABLED,
+    googleClientId: process.env.GOOGLE_CLIENT_ID,
+    googleClientSecret: process.env.GOOGLE_CLIENT_SECRET,
+    googleCallback: `${process.env.HOST}/api/users/login/google/callback`,
+  },
   secret: process.env.SECRET,
 };
 

config/passport.js

@@ -1,8 +1,31 @@
 const passport = require('passport');
 const mongoose = require('mongoose');
+const GoogleStrategy = require('passport-google-oauth').OAuth2Strategy;
+const {
+  googleClientId,
+  googleClientSecret,
+  googleCallback,
+  googleEnabled,
+} = require('./').googleOAuth;
 
 const User = mongoose.model('User');
 
 passport.use(User.createStrategy());
 
+if (googleEnabled) {
+  passport.use(
+    new GoogleStrategy(
+      {
+        clientID: googleClientId,
+        clientSecret: googleClientSecret,
+        callbackURL: googleCallback,
+      },
+      (accessToken, refreshToken, profile, done) => {
+        User.findOrCreate({ googleId: profile.id }, (err, user) =>
+          done(err, user),
+        );
+      },
+    ),
+  );
+}
 module.exports = passport;