Add support for verifying webhook signatures

[mrashed-dev]

Description

This PR adds support for verifying the webhook signature of inbound webhook notifications.

Usage

from flask import Flask, request, jsonify
from nylas import APIClient, Webhook
import os
import json

app = Flask(__name__)
port = 9000
NYLAS_CLIENT_SECRET = os.environ.get("NYLAS_CLIENT_SECRET")

@app.route("/", methods=["POST"])
def webhook_callback():
    signature = request.headers.get("X-Nylas-Signature")
    request_data = json.dumps(request.get_json())
    
    if not Webhook.verify_webhook_signature(signature, request_data, NYLAS_CLIENT_SECRET):
        return jsonify({"error": "Invalid signature"}), 403

    body = request.json
    print("Webhook event received: ", json.dumps(body))

    return jsonify({"success": True}), 200

if __name__ == "__main__":
    app.run(port=port)

License

I confirm that this contribution is made under the terms of the MIT license and that I have the authority necessary to make this contribution on behalf of its copyright owner.

[codecov]

Codecov Report

Merging #257 (cab6a49) into main (246d0b2) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #257      +/-   ##
==========================================
+ Coverage   95.96%   95.97%   +0.01%     
==========================================
  Files          17       17              
  Lines        1710     1716       +6     
==========================================
+ Hits         1641     1647       +6     
  Misses         69       69              

Impacted Files	Coverage Δ
nylas/client/restful_models.py	97.17% <100.00%> (+0.03%)	⬆️

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