58 lines
1.6 KiB
Python
58 lines
1.6 KiB
Python
"""
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Verify incoming webhook from Paddle
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Code inspired from https://developer.paddle.com/webhook-reference/verifying-webhooks
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"""
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import base64
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import collections
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# PHPSerialize can be found at https://pypi.python.org/pypi/phpserialize
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import phpserialize
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from Crypto.Hash import SHA1
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# Crypto can be found at https://pypi.org/project/pycryptodome/
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from Crypto.PublicKey import RSA
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from Crypto.Signature import PKCS1_v1_5
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from app.config import PADDLE_PUBLIC_KEY_PATH
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# Your Paddle public key.
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with open(PADDLE_PUBLIC_KEY_PATH) as f:
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public_key = f.read()
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# Convert key from PEM to DER - Strip the first and last lines and newlines, and decode
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public_key_encoded = public_key[26:-25].replace("\n", "")
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public_key_der = base64.b64decode(public_key_encoded)
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def verify_incoming_request(form_data: dict) -> bool:
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"""verify the incoming form_data"""
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# copy form data
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input_data = form_data.copy()
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signature = input_data["p_signature"]
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# Remove the p_signature parameter
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del input_data["p_signature"]
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# Ensure all the data fields are strings
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for field in input_data:
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input_data[field] = str(input_data[field])
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# Sort the data
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sorted_data = collections.OrderedDict(sorted(input_data.items()))
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# and serialize the fields
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serialized_data = phpserialize.dumps(sorted_data)
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# verify the data
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key = RSA.importKey(public_key_der)
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digest = SHA1.new()
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digest.update(serialized_data)
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verifier = PKCS1_v1_5.new(key)
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signature = base64.b64decode(signature)
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if verifier.verify(digest, signature):
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return True
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return False
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