How to Create a Downloadable File from AWS

To create a downloadable link for an object in AWS S3 you can generate a pre-signed URL. A pre-signed URL allows you to grant temporary access to an object in your S3 bucket without exposing your credentials.

Here’s how you can generate a pre-signed URL for an object in AWS S3 using the AWS Management Console (AWS Portal):

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Step 1: Log in to the AWS Management Console

1. Open your web browser and navigate to the AWS Management Console.
2. Log in with your AWS account credentials.

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Step 2: Navigate to the S3 Service

1. In the AWS Management Console, search for “S3” in the search bar at the top and click on “S3” to open the Amazon S3 console.
2. You’ll be taken to the S3 dashboard, where you can see your list of S3 buckets.

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Step 3: Select Your Bucket

1. In the S3 console, click on the name of the bucket that contains the object (file) for which you want to create a pre-signed URL.
2. Once inside the bucket, you’ll see a list of the objects (files) stored in that bucket.

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Step 4: Generate a Pre-Signed URL

1. Locate the object you want to generate a pre-signed URL for.
2. Click the object name, or right-click on the object name. Click “Share with a pre-signed URL” under the “Object actions” dropdown.
3. In the pop-up window, set the expiration time for the URL. The expiration can range from a few minutes to several days, depending on how long you want the URL to be valid.
4. Once the expiration time is set, click “Create presigned URL”.

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Step 5: Copy the Pre-Signed URL

1. After generating the pre-signed URL, it will be displayed in the pop-up window.
2. Click “Copy presigned URL” to copy the URL to your clipboard.
3. You can now share this URL with anyone who needs temporary access to the object. The URL will provide secure, time-limited access to the file.

Here is how you can create an s3 presigned url programmatically using python:

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Installation

First, install the AWS SDK for Python (Boto3):

pip install boto3

Python Code Example:

import logging
import boto3
from botocore.exceptions import ClientError

def create_presigned_url(bucket_name, object_name, expiration=3600):
    """Generate a presigned URL to share an S3 object

    :param bucket_name: string
    :param object_name: string
    :param expiration: Time in seconds for the presigned URL to remain valid
    :return: Presigned URL as string. If error, returns None.
    """

    # Generate a presigned URL for the S3 object
    s3_client = boto3.client('s3')
    try:
        response = s3_client.generate_presigned_url('get_object',
                                                    Params={'Bucket': bucket_name,
                                                            'Key': object_name},
                                                    ExpiresIn=expiration)
    except ClientError as e:
        logging.error(e)
        return None

    # The response contains the presigned URL
    return response

  url = create_presigned_url('BUCKET_NAME', 'OBJECT_NAME')