How do I create a Presigned URL to download a file from an S3 Bucket using Boto3?

Question

I have to download a file from my S3 bucket onto my server for some processing. The bucket does not support direct connections and has to use a Pre-Signed URL.

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The Boto3 Docs talk about using a presigned URL to upload but do not mention the same for download.

Answer 1

import boto3

s3_client = boto3.client('s3')

BUCKET = 'my-bucket'
OBJECT = 'foo.jpg'

url = s3_client.generate_presigned_url(
    'get_object',
    Params={'Bucket': BUCKET, 'Key': OBJECT},
    ExpiresIn=300)

print(url)

For another example, see: Presigned URLs — Boto 3 documentation

You can also generate a pre-signed URL using the AWS CLI:

aws s3 presign s3://my-bucket/foo.jpg --expires-in 300

See: presign — AWS CLI Command Reference