如何使用云功能删除Firebase存储中的图像？

Question

所以我有一个使用nodeJS编写的firestore触发函数，当删除firestore中的文档时，我还想删除存储在Firebase存储中的图像，存储中文件的名称与删除的文档ID相同。这是我的功能：

const functions = require('firebase-functions')

// initialize firestore database
const admin = require("../utilities/firebase_admin_init")
const db = admin.firestore()
const storage = admin.storage()

// firestore reference
const eventRef = db.collection('events')

exports.firestoreDeleteEventCleanUp = functions.firestore.document('events/{eventId}').onDelete((snapshot,context) => {

    const eventID = context.params.eventId

    // how to delete the image in firebase storage in here ????

})

和管理员初始化

const admin = require("firebase-admin")
const functions = require('firebase-functions')
admin.initializeApp(functions.config().firebase)

module.exports = admin

在Android中，我可以执行此操作以删除存储中的图片

// Create a storage reference from our app
val storageRef = storage.reference

// Create a reference to the file to delete
val desertRef = storageRef.child("images/desert.jpg")

// Delete the file
desertRef.delete().addOnSuccessListener {
    // File deleted successfully
}.addOnFailureListener {
    // Uh-oh, an error occurred!
}

但是现在我正在使用admin SDK，但我不知道如何使用admin SDK删除该文件。我试图在这里https://firebase.google.com/docs/storage/admin/start中阅读文档。但我不知道该如何删除Firebase存储中的图像，如下面的图像

如果使用Firestore触发器，则与storageRef.child("images/desert.jpg")等效吗？

Answer 1

如您所参考的文档item中所述，“ Firebase Admin SDK依赖于Google Cloud Storage客户端库来提供Cloud Storage访问。”您应该使用Node.js Client Google Cloud Storage。

尤其是，您需要使用bucket()的Storage方法和delete()的File方法，如下所示：

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

admin.initializeApp();

const db = admin.firestore()  // <- actually this is not needed for the CF below
const storage = admin.storage()

exports.firestoreDeleteEventCleanUp = functions.firestore.document('events/{eventId}').onDelete((snapshot,context) => {

    const eventID = context.params.eventId

    const defaultBucket = storage.bucket(); 
    const file = defaultBucket.file("eventThumbnail/" + eventID);

    return file.delete();

});