云函数向Firestore添加数据时出现权限错误

Question

const Firestore = require('@google-cloud/firestore');
const PROJECTID = 'MY_PROJECT_ID';
const firestore = new Firestore({
  projectId: PROJECTID,
  timestampsInSnapshots: true,
});

/**
 * Responds to any HTTP request.
 *
 * @param {!express:Request} req HTTP request context.
 * @param {!express:Response} res HTTP response context.
 */
exports.helloWorld = (req, res) => {
    return firestore.collection("users").add({
    first: "Ada",
    last: "Lovelace",
    born: 1815
    });
};

package.json：

{
  "name": "sample-http",
  "version": "0.0.1",
  "dependencies": {
    "@google-cloud/firestore": "0.17.0",
    "semver": "^5.5.1"
  }
}

我还为数据库设置了如下规则：

service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
        allow read, write;
    }
  }
}

Answer 1

多亏了@andresmijares，我才得以解决我的问题。我进一步研究了quickstart，并按以下方式更改了index.js（特别是helloWorld函数之前的所有内容）。

const admin = require('firebase-admin');

admin.initializeApp({
  credential: admin.credential.applicationDefault()
});

const db = admin.firestore();

/**
 * Responds to any HTTP request.
 *
 * @param {!express:Request} req HTTP request context.
 * @param {!express:Response} res HTTP response context.
 */
exports.helloWorld = (req, res) => {
/*  let message = req.query.message || req.body.message || 'Hello World!';
  res.status(200).send(message);
  */
    return db.collection("users").add({
    first: "Ada",
    last: "Lovelace",
    born: 1815
    });
};

我得到了错误

“无法加载文件index.js中的代码。是否列出了包中的所有必需模块。json依赖项？详细堆栈跟踪：错误：找不到模块'firebase-admin'”

{
  "name": "sample-http",
  "version": "0.0.1",
    "dependencies": {
    "semver": "^5.5.1",
    "@google-cloud/firestore": "^1.3.0",
    "firebase-admin": "^7.1.1"
  }
}