无法使用firebase函数将字节数组映像上传到fire-storage

Question

我无法使用云功能将字节数组格式的图像文件上传到firestore。下面的代码在app.listen（）的本地工作正常但是当我尝试使用导出功能时它无法正常工作

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);

有人可以帮帮我吗。提前致谢

Answer 1

这是我使用Firebase功能和Google Cloud Pub / Sub将文件上传到Firebase存储时的最终解决方案。

注意Pub / Sub是可选的，仅适用于我的用例

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

function saveImage(filename, data) {
    const bucket = admin.storage().bucket();
    const imageBuffer = new Uint8Array(data);
    const file = bucket.file(`optional_sub_directory/${filename}`, {
        uploadType: {resumable: false}
    });

    file.save(imageBuffer, (err) => {
        if (err) {
            console.error(`Error uploading: ${filename} with message: ${err.message}`);
            return;
        }

        console.log('Uploaded file');
    });
}

exports.helloPubSub = functions.pubsub
    .topic('demo-topic')
    .onPublish(async(message) => {
        /**
         *  Here goes code to extract the file buffer
         */

        const buffer = /** buffer */

        saveImage("stack_overflow.txt", buffer);
    });

Answer 2

一些阅读后，图像上传到firebase存储。我意识到，不是将字节数组转换为Image，我们可以使用Uint8Array（）直接上传字节数组，自动将其转换为图像并上传到firebase存储中。以下是修改后的代码。

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);

Answer 3

谢谢你的回复。我使用相同的方法，但我有两个问题。首先是虽然正在上传图像但是在运行该功能时我没有得到响应。另一个问题是我在下载后和Firebase页面上看不到图像。我已将ContentType设置为'image / jpg'。

这是我的代码：

const bucket = admin.storage().bucket();

  try {
    const imageBuffer = new Uint8Array(req.rawBody);
    const file = bucket.file(`projects/sample.jpg`);

    file.save(
      imageBuffer,
      { resumable: false, metadata: { contentType: "image/jpg" } },
      err => {
        if (err) {
          throw new Error(err);
        }
        res.send({
          success: true,
          message: "File Successfully Uploaded..."
        });
      }
    );

  } catch (error) {
    throw new Error(error);
  }