How to Properly Use AWS S3 Presigned URLs

In this tutorial, we’ll deploy a REST API to Lambda using Chalice, call the REST API to get a presigned URL, and finally upload a file directly to the S3 bucket.

#programming #aws-lambda #aws #devops #s3

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Working with S3 pre-signed URLs

TL;DR

S3 pre-signed URLs grant temporary access to objects in AWS S3 buckets without the need to grant explicit permissions.

• Supports only GET and PUT requests.
• Request headers must exactly match both when creating and using the URLs.

Motivation

It’s a best practice to keep S3 buckets private and only grant public access when absolutely required. Then how can you grant your client access to an object without changing the bucket ACL, creating roles, or providing a user on your account? That’s where S3 pre-signed URLs come in.

Pre-Signed URLs

S3 pre-signed URLs are a form of an S3 URL that temporarily grants restricted access to a single S3 object to perform a single operation — either PUT or GET — for a predefined time limit.

To break it down:

• It is secure — the URL is signed using an AWS access key
• It grants restricted access — only one of GET or PUT is allowed for a single URL
• Only to a single object — each pre-signed URL corresponds to one object
• With a time-constrained — the URL expires after a set timeout

In the next section, we’ll use these properties to generate an S3 pre-signed URL.

So let’s jump over to some code samples.

Key Points

Building a solution with S3 pre-signed URLs is not without its pitfalls. Here are some pointers to save you valuable time:

1. You must send the same HTTP headers — when accessing a pre-signed URL — as you used when you generated it. For example, if you generate a pre-signed URL with the Content-Type header, then you must also provide this header when you access the pre-signed URL. Beware that some libraries - for example, Axios - attach default headers, such as Content-Type, if you don’t provide your own.

#aws-s3 #serverless #aws #presigned-url #aws-s3-bucket

How to Properly Use AWS S3 Presigned URLs

In this tutorial, we’ll deploy a REST API to Lambda using Chalice, call the REST API to get a presigned URL, and finally upload a file directly to the S3 bucket.

#programming #aws-lambda #aws #devops #s3

Use Presigned URL to upload files into AWS S3

In this blog post, I will be walking through the steps as to how we can utilize the presigned url feature to upload files into AWS S3.  Serverless will be used to spin up the necessary AWS resources for this post.

Why do we need a Presigned URL in the first place?

Presigned URL can be used in an instance such as the customer/user wants to upload a file into an S3 bucket, of which he/she doesn’t have access privileges to do so. Hence this mechanism can be used as a secured way of allowing unauthorized users to perform upload/download, into or from S3. This releases the burden from the user’s perspective of having the AWS Credentials (accesskey + secretkey) in place to make the request. Presigned URL also comes with an expiration date and time, hence it can be used more than once till it burns out.

Prerequisites:

AWS CLI and Serverless must be configured. You can follow  this if you haven’t set it up already.

AWS Resources that we’ll need:

• an S3 Bucket
• an AWS Lambda Function
• an API Gateway endpoint

#aws #aws-lambda #s3 #serverless

How to Use the AWS CLI to Upload Files to AWS S3

Amazon Web Service, aka AWS, is a leading cloud infrastructure provider for storing your servers, applications, databases, networking, domain controllers, and active directories in a widespread cloud architecture. AWS provides a Simple Storage Service (S3) for storing your objects or data with (119’s) of data durability. AWS S3 is compliant with PCI-DSS, HIPAA/HITECH, FedRAMP, EU Data Protection Directive, and FISMA that helps satisfy regulatory requirements.

When you log in to the AWS portal, navigate to the S3 bucket, choose your required bucket, and download or upload the files. Doing it manually on the portal is quite a time-consuming task. Instead, you can use the AWS Command Line Interface (CLI) that works best for bulk file operations with easy-to-use scripts. You can schedule the execution of these scripts for an unattended object download/upload.

#aws #aws cli #aws s3

The Benefits of Amazon S3 Explained Through a Comic

AWS S3 is one of the most fundamental services of AWS Cloud.

It’s basically your unlimited and safest cloud storage.

Read this comic style conversation between two guys and get to know why some of the biggest companies in the world are using Amazon S3 for their business and why you should use it too.

#aws-s3 #aws #cloud-computing #cloud-storage #data-storage #aws-services #aws-top-story #aws-certification