如何使用 node.js 使用 aws Lambda 发布文件

Question

我需要读取 s3 文件并使用 Node.js V12 Labmda 将其发送到第三方 api。

我能够从存储桶中读取 s3 文件。 但是我在使用 https 请求或 post 方法将该文件上传到第三方 url 时遇到问题。 我尝试了几种方法，但都没有成功。

这是我的 lambda 示例代码。 您能否查看并指导我如何解决此问题。

const AWS = require('aws-sdk');
const http = require('https');
const querystring = require('querystring');

exports.handler = async function(event, context, callback) {
    const params = {
        Bucket: "bucket",
        Key: "filename"
    };
    var content = await s3.getObject(params).promise();
    await uploadFile("url", callback, content);
};

const uploadFile = async (url, callback, content) => {
    return new Promise((resolve, reject) => {

        var requestData = {};
        requestData['file'] = content;

        const postData = querystring.stringify(requestData);

        const options = {
            hostname: 'xxx.xxx',
            path: url,
            method: 'POST',
            headers: {
                'Content-Type': "multipart/form-data",
                'Content-Length': Buffer.byteLength(postData)
            }
        };

        const req = http.request(options, (res) => {

            res.on('data', (chunk) => {
                //do something
            });
            res.on('end', () => {
                // do something
            });
        })
        req.write(postData);
        req.end();

    });
}

Answer 1

我可以看到一个带有requests模块的示例，也许它可以帮助：

const AWS = require('aws-sdk');
const http = require('https');
const querystring = require('querystring');
let request = require('request')

exports.handler = async function(event, context, callback) {
    const params = {
        Bucket: "bucket",
        Key: "filename"
    };
    let readStream = s3.getObject(params).createReadStream()
    await uploadFile("url", callback, readStream);
};

const uploadFile = async (url, callback, readStream) => {
    return new Promise((resolve, reject) => {

        var requestData = {};

        const postData = querystring.stringify(requestData);
        
        let formData = {
          applicationType: 'my_app_type',
          applicationName: 'my_app_name',
          upload: {
            value: readStream,
            options: {
              filename: 'my_file_name.zip', // adjust accordingly
              contentType: 'application/zip' // adjust accordingly
              knownLength: Buffer.byteLength(postData) // this is important
            }
          }
        }
        
        request.post({
          url: 'your_url',
          formData: formData
        }, function (error, response, body) {
          if (error) throw error
          console.log(body)
        });

    });
}

所以，我还挺合并的片段这个例子中，在OP试图PUT的内容，而不是POST荷兰国际集团它。

但是请注意，上面的代码未经测试。