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configs/passport.js

+const passport = require('passport')
+const GoogleStrategy = require('passport-google-oauth20')
+const KEYS = require('./keys')
+
+
+// set cookie base on this user
+passport.serializeUser((user, done) => {
+
+    let sessionUser = {
+        _id: user.googleID,
+        accessToken: user.accesstoken,
+        name: user.name,
+        pic_url: user.pic_url,
+        email: user.email
+    }
+
+    done(null, sessionUser)
+})
+
+// get cookie & get relevent session data
+passport.deserializeUser((sessionUser, done) => {
+
+    done(null, sessionUser) // now can access request.user
+})
+
+
+passport.use(
+    // google login
+    new GoogleStrategy(
+        // google keys
+        {
+            clientID: KEYS.googleOauth.clientID,
+            clientSecret: KEYS.googleOauth.clientSecret,
+            callbackURL: KEYS.googleOauth.callback,
+            passReqToCallback: true
+
+        }, (request, accessToken, refreshToken, profile, done) => {
+
+            //save data in session
+            user = {
+                "accesstoken": accessToken,
+                'googleID': profile.id,
+                'name': profile.displayName,
+                'pic_url': profile._json.picture,
+                'email': profile._json.email
+            }
+
+            done(null, user)
+        }
+    )
+)
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