Cloud Functionsから認証付きのCloud Firestoreを突破

fn.ts

import * as admin from 'firebase-admin';
import * as functions from 'firebase-functions';

const validReferrers = [
  'http://localhost:9012',
];

admin.initializeApp(functions.config().firebase);

const db = admin.firestore();

function checkIsValidRequest(referrer?: string) {
  if (!referrer) return false;
  return validReferrers.some(url => referrer.includes(url));
}

async function getAllEntries() {
  const snapshot = await db.collection('entries').get().catch(err => {
    console.log('Error getting documents', err);
  });

  const result: string[] = [];
  if (!snapshot) return result;

  snapshot.forEach((doc) => {
    const { firstname, lastname } = doc.data();
    result.push(`${doc.id} => ${firstname} ${lastname}`);
  })

  return result;
}

export const helloWorld = functions.https.onRequest(async (request, response) => {
  const referrer = request.header('Referrer');
  const isValidRequest = checkIsValidRequest(referrer);
  if (!isValidRequest) {
    response.send(`request is invalid. referrer[${referrer}]`);
    return;
  }

  /*
   * add
   */
  const ref = await db.collection('entries').add({ firstname: 'add!', lastname: Date.now().toString() })

  const entries = await getAllEntries();
  response.send(`add ref.id:${ref.id}\nentries.\n${entries.join('\n')}`);
});