# AWS S3 1. 申請IAM，取得access key 和 secret key 2. 下載 aws-sdk 官方文件： ## S3 公開存取 S3 有 host 靜態網站功能，但必須開啟公開讀取權限。 `許可 -> 儲存貯體政策`，增加如下設置 ``` { "Version": "2012-10-17", "Statement": [ { "Sid": "PublicReadGetObject", "Effect": "Allow", "Principal": "*", "Action": [ "s3:GetObject" ], "Resource": [ "arn:aws:s3:::<更改為你的 Bucket-Name>/*" ] } ] } ``` 取消勾選封鎖存取 ![](/files/ODLYOXJMv2ONtRPoaX8K) ## 上傳到 S3 範例 > 以下程式開啟後會先當一個範例上傳網站，然後可以在此上傳檔案，之後會傳到S3，使用的上傳檔案模組為busboy ```javascript const http = require('http'), path = require('path'), os = require('os'), fs = require('fs'); var Busboy = require('busboy'); const AWS = require('aws-sdk'); // 填入已經創建的S3 bucket名稱 const BUCKET_NAME = 'marketplace-model'; // 從IAM獲得 const IAM_USER_KEY = 'key'; const IAM_USER_SECRET = 'secret'; function uploadToS3(file, filename) { let s3bucket = new AWS.S3({ accessKeyId: IAM_USER_KEY, secretAccessKey: IAM_USER_SECRET, Bucket: BUCKET_NAME, }); s3bucket.createBucket(function () { var params = { Bucket: BUCKET_NAME, Key: filename, Body: file, ACL: "public-read" }; s3bucket.upload(params, function (err, data) { if (err) { console.log('error in callback'); console.log(err); } console.log('success'); console.log(data); }); }); } http.createServer(function(req, res) { if (req.method === 'POST') { var busboy = new Busboy({ headers: req.headers }); busboy.on('field', function(fieldname, val, fieldnameTruncated, valTruncated, encoding, mimetype) { folder_name = val }); busboy.on('file', function(fieldname, file, filename, encoding, mimetype) { // busboy讀完的是stream，需要轉為buffer然後上傳到S3 var bufs = []; file.on('data', function(data) { bufs.push(data); }); file.on('end', function() { var buf = Buffer.concat(bufs); uploadToS3(buf, filename); }); }); busboy.on('finish', function() { res.writeHead(200, { 'Connection': 'close' }); res.end("That's all folks!"); }); return req.pipe(busboy); } else if (req.method === 'GET') { res.writeHead(200, { Connection: 'close' }); res.end('\ \ '); } }).listen(8000, function() { console.log('Listening for requests'); }); ``` > 在createBucket的params的參數key前面加上路徑/test/test.png 則會自動在S3新增test資料夾 > 如果是一些中文檔案名稱記得用 encodeURI 再 putObject 然後下載時也是 ## 開啟 S3 CORS 到下圖中設定 ![](/files/CO0aS7S4ufPm1FpXgwr7) 加上類似如下 ``` HEAD ``` 完整版為： ``` * GET HEAD 3000 Authorization ``` --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://easonwang.gitbook.io/web_advance/aws/aws-s3.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.