urllib3-sigv4 0.3.0

Extension to urllib3 adding support for AWS Signature Version 4

urllib3 SigV4

Extension to urllib3 adding support for signing the requests with AWS Signature Version 4. It uses the Boto3 library for handling the AWS credentials and the actual signing process.

Installation

Use pip to install the package:

pip install urllib3_sigv4

Usage

This library provides a drop-in replacement for two main components of urllib3, the PoolManager class and the top-level request method. It adds a new optional parameter which determines if and how the requests should be signed.

Creating a Signer

First, create an instance of the SigV4RequestSigner class which defines the parameters for request signing:

from urllib3_sigv4 import SigV4RequestSigner

signer = SigV4RequestSigner(
    "lambda",
    region="eu-central-1",
    access_key="AKIAIOSFODNN7EXAMPLE",
    secret_key="wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY"
)

The first parameter is mandatory and identifies the AWS service we want to make requests to (AWS Lambda in this case). The region, access_key and secret_key parameters are optional and will be inferred from the environment if not passed (via the default Boto3 session, see here and here for more details).

Making Requests

To make signed requests to an AWS service, pass the signer instance via the signer parameter when creating the PoolManager:

from urllib3_sigv4 import PoolManager, SigV4RequestSigner

signer = SigV4RequestSigner("lambda")
http = PoolManager(signer=signer)

response = http.request(
    "POST",
    "https://my-lambda-url-id.lambda-url.eu-central-1.on.aws",
    json={"name": "John Doe", "age": 30}
)
print(response.json())

You can also provide the signer in individual request method calls to override the default behavior:

from urllib3_sigv4 import PoolManager, SigV4RequestSigner

signer = SigV4RequestSigner("lambda")
http = PoolManager()

# The same as when using urllib3's PoolManager.
response = http.request("GET", "https://httpbin.org/get")
print(response.json())

# This request will be signed.
response = http.request(
    "POST",
    "https://my-lambda-url-id.lambda-url.eu-central-1.on.aws",
    json={"name": "John Doe", "age": 30},
    signer=signer
)
print(response.json())

You can also use a convenience top-level request method which uses a module-global PoolManager instance:

from urllib3_sigv4 import SigV4RequestSigner, request

signer = SigV4RequestSigner("lambda")

response = request(
    "POST",
    "https://my-lambda-url-id.lambda-url.eu-central-1.on.aws",
    json={"name": "John Doe", "age": 30},
    signer=signer
)
print(response.json())

Reference

• https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_aws-signing.html
• https://github.com/aws-samples/sigv4-signing-examples
• https://github.com/awslabs/aws-sdk-python-signers