“ context.auth.uid” TypeError：无法读取未定义的属性'uid'

Question

我只是想使用Firebase函数获取经过身份验证的用户的“ uid ”。但是每次我在“ firebase functions：shell ”中运行该函数时。我得到这些错误。谁能帮我解决这个问题？

“ context.auth.uid” 类型错误：无法读取未定义的属性'uid'

exports.sendNewUser = functions.database.ref('/Users/')
.onCreate(async (snapshot, context) => {

    const userId = await context.auth.uid;

    const tokenPath = await admin.database().ref('Notify').once('value')

    var message = []

    tokenPath.forEach((childSnapshot) => {
        var allTokens = childSnapshot.val().expo

        if (allTokens) {
            message.push({
                "to": allTokens,
                "header": " Users",
                "body": "New user has been added, check them out!!!"
            })
        }
    })

    await fetch('https://exp.host/--/api/v2/push/send', {
        method: "POST",
        headers: {
            "Accept": "application/json",
            "Content-Type": "application/json"
        },
        body: JSON.stringify(message)
    })

    console.log("The user ID is : " + userId)

})

Package.json：

{
  "name": "functions",
  "description": "Cloud Functions for Firebase",
  "scripts": {
    "lint": "eslint .",
    "serve": "firebase serve --only functions",
    "shell": "firebase functions:shell",
    "start": "npm run shell",
    "deploy": "firebase deploy --only functions",
    "logs": "firebase functions:log"
  },
  "dependencies": {
    "dateformat": "^3.0.3",
    "firebase-admin": "6.3.0",
    "firebase-functions": "^2.1.0",
    "node-fetch": "^2.3.0"
  },
  "devDependencies": {
    "eslint": "^4.12.0",
    "eslint-plugin-promise": "^3.6.0"
  },
  "private": true
}

Answer 1

running Realtime Database triggers的文档很明确：

  

默认情况下，shell运行带有以下内容的实时数据库功能   管理特权。使用auth选项代替运行   可以作为特定的最终用户或未经身份验证的用户使用

# to mock unauthenticated user
myDatabaseFunction('data', {authMode: 'USER'})
# to mock end user
myDatabaseFunction('data', {auth: {uid: 'abcd'}})

您需要在上下文中传递模拟auth有效负载的最后一个对象。否则，auth将不包含任何内容。

发布后它将正常工作。

访问uid时不需要使用await。这不是一个异步函数。

Answer 2

context.auth.uid将由onCreate触发器定义，因为它是由云功能运行时而不是由创建文档的用户触发的。

请参见https://stackoverflow.com/a/64345666/4868790