app-MAIL-temp/app/paddle_utils.py

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"""
Verify incoming webhook from Paddle
Code inspired from https://developer.paddle.com/webhook-reference/verifying-webhooks
"""
import base64
import collections
# PHPSerialize can be found at https://pypi.python.org/pypi/phpserialize
import phpserialize
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import requests
from Crypto.Hash import SHA1
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# Crypto can be found at https://pypi.org/project/pycryptodome/
from Crypto.PublicKey import RSA
from Crypto.Signature import PKCS1_v1_5
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from app.config import PADDLE_PUBLIC_KEY_PATH, PADDLE_VENDOR_ID, PADDLE_AUTH_CODE
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# Your Paddle public key.
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from app.log import LOG
with open(PADDLE_PUBLIC_KEY_PATH) as f:
public_key = f.read()
# Convert key from PEM to DER - Strip the first and last lines and newlines, and decode
public_key_encoded = public_key[26:-25].replace("\n", "")
public_key_der = base64.b64decode(public_key_encoded)
def verify_incoming_request(form_data: dict) -> bool:
"""verify the incoming form_data"""
# copy form data
input_data = form_data.copy()
signature = input_data["p_signature"]
# Remove the p_signature parameter
del input_data["p_signature"]
# Ensure all the data fields are strings
for field in input_data:
input_data[field] = str(input_data[field])
# Sort the data
sorted_data = collections.OrderedDict(sorted(input_data.items()))
# and serialize the fields
serialized_data = phpserialize.dumps(sorted_data)
# verify the data
key = RSA.importKey(public_key_der)
digest = SHA1.new()
digest.update(serialized_data)
verifier = PKCS1_v1_5.new(key)
signature = base64.b64decode(signature)
if verifier.verify(digest, signature):
return True
return False
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def cancel_subscription(subscription_id: int) -> bool:
r = requests.post(
"https://vendors.paddle.com/api/2.0/subscription/users_cancel",
data={
"vendor_id": PADDLE_VENDOR_ID,
"vendor_auth_code": PADDLE_AUTH_CODE,
"subscription_id": subscription_id,
},
)
res = r.json()
if not res["success"]:
LOG.exception(
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f"cannot cancel subscription {subscription_id}, paddle response: {res}"
)
return res["success"]
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def change_plan(subscription_id: str, plan_id) -> (bool, str):
"""return whether the operation is successful and an optional error message"""
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r = requests.post(
"https://vendors.paddle.com/api/2.0/subscription/users/update",
data={
"vendor_id": PADDLE_VENDOR_ID,
"vendor_auth_code": PADDLE_AUTH_CODE,
"subscription_id": subscription_id,
"plan_id": plan_id,
},
)
res = r.json()
if not res["success"]:
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try:
# "unable to complete the resubscription because we could not charge the customer for the resubscription"
if res["error"]["code"] == 147:
return False, "Your card cannot be charged"
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except KeyError:
LOG.exception(
f"cannot change subscription {subscription_id} to {plan_id}, paddle response: {res}"
)
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return False, ""
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return False, ""
return res["success"], ""