AWS Lambda: Python store to S3

handler.py

# This file is your Lambda function
import json
import boto3


def save_to_bucket(event, context):
    AWS_BUCKET_NAME = 'my-bucket-name'
    s3 = boto3.resource('s3')
    bucket = s3.Bucket(AWS_BUCKET_NAME)
    path = 'my-path-name.txt'
    data = b'Here we have some data'
    bucket.put_object(
        ACL='public-read',
        ContentType='application/json',
        Key=path,
        Body=data,
    )

    body = {
        "uploaded": "true",
        "bucket": AWS_BUCKET_NAME,
        "path": path,
    }
    return {
        "statusCode": 200,
        "body": json.dumps(body)
    }

serverless.yml

# This file will generate an API endpoint for your handler,
# using serverless (see www.serverless.com)
#
# For full config options, check the docs:
#    docs.serverless.com
#

service: hello-world-functions

provider:
  name: aws
  runtime: python3.6
  region: eu-central-1
  iamRoleStatements:
      - Effect: Allow
        Action:
          - s3:*
        Resource: "*"
 
functions:
  helloworld:
    handler: handler.save_to_bucket
    events:
      - http:
          path: helloworld/upload_to_S3
          method: get
          cors: true