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Description:

authaws4 0.1.6

Usecase agnostic implementation of AWS4 Sig v4
This implementation aims to be usecase agnostic. As such it accepts the
component pieces of a request rather than a full opinionated request object
like httpx.Request.
https://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-authenticating-requests.html
Usage
Validation
from aws4 import generate_challenge, validate_challenge

payload = "<extract content from request>"

challenge = generate_challenge(
method=request.method,
url=request.url,
headers=request.headers,
content=payload.decode("utf-8"),
)

secret_access_key = <load secret key using the challenge.access_key_id>

validate_challenge(challenge, secret_key.secret_access_key)

Signing
An example of an httpx AWS4 request signing. In this example the Authorization header is injected into request.headers
from datetime import datetime, timezone

import aws4

service = "s3"
region = "us-east-1"
access_key_id = "my-access-key-id"
secret_access_key = "my-secret-access-key"

def http_aws4_auth(request: httpx.Request):
dt = datetime.now(tz=timezone.utc)
request.headers["x-amz-date"] = aws4.to_amz_date(dt)
request.headers["host"] = request.url.netloc.decode("utf-8")

body = request.content.decode("utf-8")
if body:
request.headers["Content-Length"] = str(len(body))

aws4.sign_request(
service,
request.method,
request.url,
region,
request.headers,
body,
access_key_id,
secret_access_key,
dt,
)

with httpx.Client() as client:
r = client.request(
url="http://localhost",
auth=auth,
)

Extra credit
Thanks to @ozzzzz and
@ivanmisic for work on the initial
httpx/fastapi implementations this was extracted from.