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Slack Signature Authentication for Flask

https://codecov.io/gh/eaescob/flask-slacksigauth/branch/master/graph/badge.svg?token=WPOI4PT5ZU https://badge.fury.io/py/flask-slacksigauth.png

The Slack Signature Authentication module is a Python-based solution for Flask applications to be able to authenticate POST requests coming in from Slack. The module returns HTTP code 403 for those requests that fail Slack's signature validation. The module adds a decorator that can be used for Flask routes.

Integrity

Added SLSA provenance checks to every release starting with v1.0.9

You will need to install slsa-verifier first

Provenance verification

python -m pip download --only-binary=:all: flask-slacksigauth #Downloads flask_slacksigauth-1.0.9-py3-none-any.whl
curl --location -O https://github.com/eaescob/flask-slacksigauth/releases/download/v1.0.9/multiple.intoto.jsonl
slsa-verifier verify-artifact                             \
  --provenance-path multiple.intoto.jsonl                 \
  --source-uri github.com/eaescob/flask-slacksigauth      \
  flask_slacksigauth-1.0.9-py3-none-any.whl

Check for - PASSED: Verified SLSA Provenance

After successful verification, package is safe to be installed.

Installation

pip install flask-slacksigauth

App Setup

After declaring your Flask API endpoints, you can decorate them to for authentication checks:

@app.route('/api', methods=['POST', 'GET'])
@slack_sig_auth
def api():
  return jsonify(message='OK'), 200

This will force slack signature authentication for you '/api' endoint.