NestJS에 fcm 적용하기

• 파이어베이스 콘솔에서 프로젝트 설정 -> 서비스계정에 들어가서 새 비공개 키를 발급해 다운 받는다.
  
• firebase폴더를 만들고 폴더안에 발급받은 키 파일을 넣는다.
  
• fcm.service.ts를 작성한다.

  import { Injectable } from '@nestjs/common/decorators/core/injectable.decorator';
  import { Inject, Logger } from '@nestjs/common';
  import * as firebaseConfig from './firebase.config.json';
  import * as admin from 'firebase-admin';
  
  const firebase_params = {
    type: firebaseConfig.type,
    projectId: firebaseConfig.project_id,
    privateKeyId: firebaseConfig.private_key_id,
    privateKey: firebaseConfig.private_key,
    clientEmail: firebaseConfig.client_email,
    clientId: firebaseConfig.client_id,
    authUri: firebaseConfig.auth_uri,
    tokenUri: firebaseConfig.token_uri,
    authProviderX509CertUrl: firebaseConfig.auth_provider_x509_cert_url,
    clientC509CertUrl: firebaseConfig.client_x509_cert_url,
  };
  
  @Injectable()
  export class FcmService {
    constructor() {
      admin.initializeApp({
        credential: admin.credential.cert(firebase_params),
      });
    }
    async fcm(token: string, title: string, message: string) {
      const payload = {
        token: token,
        notification: {
          title: title,
          body: message,
        },
        data: {
          body: message,
        },
      };
      console.log(payload);
      const result = await admin
        .messaging()
        .send(payload)
        .then((response) => {
          // Response is a message ID string.
          // console.log('Successfully sent message:', response);
          // return true;
          return { sent_message: response };
        })
        .catch((error) => {
          // console.log('error');
          // console.log(error.code);
          // return false;
          return { error: error.code };
        });
      return result;
    }
  }

참고 : https://noonestaysthesame.tistory.com/m/17

https://firebase.google.com/docs/cloud-messaging/send-message?hl=ko