Using boto3 generate_presigned_post()

README.md

Using an S3 presigned POST url.

1. Copy the generate.py script to your machine.

2. Update the BUCKET_NAME and KEY_NAME values in the script as needed.

3. Run python generate.py. It will spit some output like the following:

   $ python3 generate.py
   curl command:
   
   curl -v -F key=cat.jpg \
     -F AWSAccessKeyId=AKIANOTAKEY \
     -F policy=eyKJLJSDFLKJASDLFJLAKSDJFLJASDLFAKLNFLNASDJFLAJSDLKFJ== \
     -F signature=4jsdlkjasdljfljsdljf/5A= \
     -F file=@cat.jpg \
     https://presigned-post-example.s3.amazonaws.com/

4. Copy and paste the curl command into your terminal to upload the file.

generate.py

import boto3

# Change BUCKET_NAME to your bucket name and
# KEY_NAME to the name of a file in the directory where you'll run the curl command.
BUCKET_NAME = 'presigned-post-example'
KEY_NAME = 'cat.jpg'

s3 = boto3.client('s3')

resp = s3.generate_presigned_post(
    Bucket=BUCKET_NAME,
    Key=KEY_NAME,
)

resp['fields']['file'] = '@{key}'.format(key=KEY_NAME)

form_values = "\n    ".join(["-F {key}={value} \\".format(key=key, value=value)
                        for key, value in resp['fields'].items()])

print('curl command: \n')
print('curl -v {form_values} \n    {url}'.format(form_values=form_values, url=resp['url']))
print('')

Can we use wildcard for the key name like (/path/*)