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from ellipticcurve.ecdsa import Ecdsa
from ellipticcurve.publicKey import PublicKey
from ellipticcurve.signature import Signature
from .eventwebhook_header import EventWebhookHeader
class EventWebhook:
"""
This class allows you to use the Event Webhook feature. Read the docs for
more details: https://sendgrid.com/docs/for-developers/tracking-events/event
"""
def __init__(self, public_key=None):
"""
Construct the Event Webhook verifier object
:param public_key: verification key under Mail Settings
:type public_key: string
"""
self.public_key = self.convert_public_key_to_ecdsa(public_key) if public_key else public_key
def convert_public_key_to_ecdsa(self, public_key):
"""
Convert the public key string to a ECPublicKey.
:param public_key: verification key under Mail Settings
:type public_key string
:return: public key using the ECDSA algorithm
:rtype PublicKey
"""
return PublicKey.fromPem('\n-----BEGIN PUBLIC KEY-----\n'+public_key+'\n-----END PUBLIC KEY-----\n')
def verify_signature(self, payload, signature, timestamp, public_key=None):
"""
Verify signed event webhook requests.
:param payload: event payload in the request body
:type payload: string
:param signature: value obtained from the 'X-Twilio-Email-Event-Webhook-Signature' header
:type signature: string
:param timestamp: value obtained from the 'X-Twilio-Email-Event-Webhook-Timestamp' header
:type timestamp: string
:param public_key: elliptic curve public key
:type public_key: PublicKey
:return: true or false if signature is valid
"""
timestamped_payload = timestamp + payload
decoded_signature = Signature.fromBase64(signature)
key = public_key or self.public_key
return Ecdsa.verify(timestamped_payload, decoded_signature, key)
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