根据要求在Firebase中下载文件 [英] Download File on Request in Firebase

问题描述

我正在寻找一种解决方案，可以在遇到API端点时直接下载Firebase存储中的文件.我尝试初始化Google-Cloud存储并从存储桶中下载文件.

I am looking for a solution to directly download a file in the Firebase Storage when hitting an API endpoint. I tried initializing a Google-Cloud Storage and downloading the file from the bucket.

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

const storage = new Storage({keyFilename: keyPath});

app.get("/download", (req, res) => {
    storage.bucket(bucketName).file("file.txt").download({destination: './file.txt'});
});

app.listen(8080);

但这不起作用！

我只是得到:

UnhandledPromiseRejectionWarning: Error: Not Found

有人可以帮我吗?

推荐答案

如果打算将文件流传输到发出请求的客户端，则可以将数据从Cloud Storage传递到响应.它将类似于以下内容:

If the intention is to stream the file to the requesting client, you can pipe the data from Cloud Storage through to the response. It will look similar to the following:

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

const BUCKET_NAME = 'my-bucket';

const app = express();
const storage = new Storage({keyFilename: './path/to/service/key.json'});

app.get("/download", (req, res) => {
    storage.bucket(bucketName).file("path/in/bucket/to/file.txt").createReadStream()
      .on('error', (err) => {
        res.status(500).send('Internal Server Error');
        console.log(err);
      })
      .on('response', (storageResponse) => {
        // make sure to check storageResponse.status

        res.setHeader('content-type', storageResponse.headers['Content-Type']);
        res.setHeader('content-length', storageResponse.headers['Content-Length']);
        res.status(storageResponse.status);
        // other headers may be necessary

        // if status != 200, make sure to end the response as appropriate. (as it won't reach the below 'end' event)
      })
      .on('end', () => {
        console.log('Piped file successfully.');
        res.end();
      }).pipe(res);
});

app.listen(8080);

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