无法使用 firebase 函数将字节数组图像上传到 fire-storage

Question

我无法使用云函数将字节数组格式的图像文件上传到 firestore。下面的代码在本地使用app.listen()工作正常，但是当我尝试使用导出功能时，它不起作用

const functions = require('firebase-functions');
const { Storage } = require('@google-cloud/storage');
const express = require('express');
var app = express();
var fs = require('fs');

// Your Google Cloud Platform project ID
const projectId ='<project-Id>';

// Creates a client
const storage = new Storage({
projectId: projectId,
keyFilename: '<>'
});


const bucket = storage.bucket("<bucket-name>");

// Byte aray to Image 

function saveImage(filename, data) {
console.log("inside saveImage", data.length);
var myBuffer = new Buffer.alloc(data.length);
for (var i = 0; i < data.length; i++) {
    myBuffer[i] = data[i];
}
console.log(myBuffer)
fs.createWriteStream(filename, myBuffer, 'binary', function (err) {
    console.log("inside writeFile");
    if (err) {
        console.log('error inside fs', err);
    } else {
        console.log("The file was saved!");
    }
 });
}

saveImage("image1.png", result);


app.use(function (req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, 
Content-Type, Accept");
next();
});



exports.UploadImage = functions.https.onRequest(app);

有人可以帮我吗？提前致谢

Answer 1

经过一番阅读后，图像上传到 firebase 存储中。我意识到，我们可以使用Uint8Array()直接上传字节数组，而不是将字节数组转换为图像， 它会自动将其转换为图像并上传到 firebase 存储中。下面是修改后的代码。

const functions = require('firebase-functions');
const { Storage } = require('@google-cloud/storage');
const express = require('express');
var app = express();

// Your Google Cloud Platform project ID
const projectId ='<project-Id>';

// Creates a client
const storage = new Storage({

    projectId: projectId,
    keyFilename: './servicekey.json'
});


const bucket = storage.bucket("<bucket-name>");

const options = {
    action: 'read',
    expires: '03-17-2025'
};

// storing Byte array

function saveImage(filename, data) {

 var imageBuffer = new Uint8Array(data);
 var file = bucket.file(filename);

 file.save(imageBuffer, {
           metadata: { contentType: 'image/png' },
           }, 
           ((error) => {

           if (error) {
              console.log('error')
           }
        file.getSignedUrl(options)
        .then(results => {
            const url = results[0];
            console.log(`The signed url for ${imageName} is ${url}.`);
        })
 }));

}

saveImage("image1.png", <byte-Array as input>);


app.use(function (req, res, next) {
 res.header("Access-Control-Allow-Origin", "*");
 res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, 
 Content-Type, Accept");
 next();
});



exports.UploadImage = functions.https.onRequest(app);