[UPD] add function to login with google on mobile

back/src/auth/auth.service.ts

@@ -1,14 +1,21 @@
 import { BadRequestException, Injectable } from '@nestjs/common';
 import { UsersService } from '../users/users.service';
 import { JwtService } from '@nestjs/jwt';
+import { ConfigService } from '@nestjs/config';
+import { OAuth2Client } from 'google-auth-library';
 import * as bcrypt from 'bcryptjs';
 import PayloadInterface from './interface/payload.interface';
 @Injectable()
 export class AuthService {
+	private readonly client : OAuth2Client;
+
 	constructor(
 		private userService: UsersService,
+		private readonly configService: ConfigService,
 		private jwtService: JwtService,
-	) {}
+	) {
+		this.client = new OAuth2Client(process.env.GOOGLE_CLIENT_ID);
+	}
 
 	async validateUser(
 		username: string,
@@ -31,4 +38,25 @@ export class AuthService {
 			access_token,
 		};
 	}
+
+	async loginWithGoogleMobile(idToken: string) {
+		const ticket = await this.client.verifyIdToken({
+			idToken,
+			audience: this.configService.get("GOOGLE_CLIENT_ID"),
+		});
+		const payload = ticket.getPayload();
+		if (payload) {
+			const user = await this.userService.findOrCreate({
+				email: payload.email,
+				firstName: payload.given_name,
+				lastName: payload.family_name,
+				picture: payload.picture,
+				googleId: payload.sub,
+			});
+			const jwt = await this.login(user);
+			return { user, jwt };
+		} else {
+			throw new BadRequestException();
+		}
+	}
 }