feat: add google strategy

src/app.module.ts

@@ -22,6 +22,9 @@ import { EnvConfig } from './config.type';
         REFRESH_SECRET: Joi.string().required(),
         ACCESS_TOKEN_EXPIRATION: Joi.string().required(),
         REFRESH_TOKEN_EXPIRATION: Joi.string().required(),
+        GOOGLE_CLIENT_ID: Joi.string().optional(),
+        GOOGLE_CLIENT_SECRET: Joi.string().optional(),
+        GOOGLE_CALLBACK_URL: Joi.string().optional(),
       }),
     }),
     MongooseModule.forRootAsync({

src/modules/auth/strategies/google.strategy.ts

@@ -0,0 +1,37 @@
+import { Injectable } from '@nestjs/common';
+import { PassportStrategy } from '@nestjs/passport';
+import { Strategy, VerifyCallback } from 'passport-google-oauth20';
+import { ConfigService } from '@nestjs/config';
+import { EnvConfig } from '../../../config.type';
+
+@Injectable()
+export class GoogleStrategy extends PassportStrategy(Strategy, 'google') {
+  constructor(private configService: ConfigService<EnvConfig>) {
+    super({
+      clientID: configService.get('GOOGLE_CLIENT_ID'),
+      clientSecret: configService.get('GOOGLE_CLIENT_SECRET'),
+      callbackURL: configService.get('GOOGLE_CALLBACK_URL'),
+      scope: ['email', 'profile'],
+    });
+  }
+
+  async validate(
+    profile: {
+      id: string;
+      name: { givenName: string; familyName: string };
+      emails: { value: string }[];
+      photos: { value: string }[];
+    },
+    done: VerifyCallback,
+  ): Promise<void> {
+    const { name, emails, photos } = profile;
+    const user = {
+      fullName: `${name.givenName} ${name.familyName}`,
+      email: emails[0].value,
+      avatar: photos[0].value,
+      oauthProvider: 'google',
+      oauthProviderId: profile.id,
+    };
+    done(null, user);
+  }
+}