@aws-sdk/s3-presigned-post
Advanced tools
Changelog
3.357.0 (2023-06-21)
Readme
This package provide a function generating URL and fields. Users without AWS credentials can use the URL and fields to to make a POST request to S3. The documentation for the server side feature can be found in S3 API Reference. Please read related sections for more context.
JavaScript Example:
const { createPresignedPost } = require("@aws-sdk/s3-presigned-post");
const { S3Client } = require("@aws-sdk/client-s3");
ES6 Example
import { createPresignedPost } from "@aws-sdk/s3-presigned-post";
import { S3Client } from "@aws-sdk/client-s3";
You can optionally attach a policy to a presigned post. It specifies a list of conditions that the request must meet. For example:
const Conditions = [{ acl: "public-read" }, { bucket: "johnsmith" }, ["starts-with", "$key", "user/eric/"]];
Visit S3 POST documentation
for supported policy elements. If you include a condition, you must specify the valid value in the Fields parameter
as well. A value will not be added automatically to the fields dictionary according to the conditions.
Users can generate required url and fields for POST request:
const client = new S3Client({ region: "us-west-2" });
const Bucket = "johnsmith";
const Key = "user/eric/1";
const Fields = {
acl: "public-read",
};
const { url, fields } = await createPresignedPost(client, {
Bucket,
Key,
Conditions,
Fields,
Expires: 600, //Seconds before the presigned post expires. 3600 by default.
});
The Bucket, Key and other values in Fields must meet the conditions specified in Conditions. The Key can also
contain ${filename} that will be automatically replaced by the name of the file provided. See the S3 reference
for more information.
You can also post a file with HTML form:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
<!-- Copy the 'url' value returned by createPresignedPost() -->
<form action="URL_VALUE" method="post" enctype="multipart/form-data">
<!-- Copy the 'fields' key:values returned by S3Client.generate_presigned_post() -->
<input type="hidden" name="key" value="VALUE" />
<input type="hidden" name="AWSAccessKeyId" value="VALUE" />
<input type="hidden" name="policy" value="VALUE" />
<input type="hidden" name="signature" value="VALUE" />
File:
<input type="file" name="file" /> <br />
<input type="submit" name="submit" value="Upload to Amazon S3" />
</form>
</body>
</html>
In Node.js, use form-data package to post a file:
const { createReadStream } = require("fs");
const FormData = require("form-data");
const form = new FormData();
Object.entries(fields).forEach(([field, value]) => {
form.append(field, value);
});
form.append("file", createReadStream("path/to/a/file"));
form.submit(url, (err, res) => {
//handle the response
});
FAQs
[](https://www.npmjs.com/package/@aws-sdk/s3-presigned-post) [](https://www.npmjs.com/package/@
The npm package @aws-sdk/s3-presigned-post receives a total of 271,149 weekly downloads. As such, @aws-sdk/s3-presigned-post popularity was classified as popular.
We found that @aws-sdk/s3-presigned-post demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 5 open source maintainers collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Security News
A hospital in Mobile, Alabama, agreed to a settlement in a landmark ransomware death lawsuit, but is now reportedly reconsidering the agreement and refusing to pay.
Security News
A new report explores how advancements in LLMs are enhancing cyber threats, including polymorphic malware, personalized spearphishing, and the risk of hijacking customer service bots.
Security News
ESLint has approved an RFC that adds support for TypeScript configuration files, which is aimed at improving the developer experience and recognizing changes in the evolving JavaScript ecosystem.