I have an AWS API Gateway that I would like to secure using IAM Roles .

I am looking for a package to help me accessing it using Python. I am trying to avoid implementing the entire Version 4 Signing Process. I am sure there must be some library I can use.

I looked into aws-requests-auth but it requires a "aws_service" to generate the signature. I looked also to boto3 but I am not able to find any way to just add authentication headers to a general request.

You can use aws-requests-auth to generate the signature for your request to API Gateway with execute-api as the service name.

import requests
from aws_requests_auth.aws_auth import AWSRequestsAuth

auth = AWSRequestsAuth(aws_access_key='YOURKEY',
                       aws_secret_access_key='YOURSECRET',
                       aws_host='restapiid.execute-api.us-east-1.amazonaws.com',
                       aws_region='us-east-1',
                       aws_service='execute-api')

headers = {'params': 'ABC'}
response = requests.get('https://restapiid.execute-api.us-east-1.amazonaws.com/stage/resource_path',
                        auth=auth, headers=headers)