tornado-eth-sign.py

import os

import tornado.ioloop
import tornado.web
from eth_account.messages import encode_defunct
from eth_account.account import Account

PRIVATE_KEY = os.environ.get("PRIVATE_KEY")


class EthSignHandler(tornado.web.RequestHandler):
    def get(self, address):
        max_per_mint = 1
        payload = f'{address.upper()}:{max_per_mint}'
        msghash = encode_defunct(text=payload)
        account = Account.from_key(PRIVATE_KEY)
        sign = account.sign_message(msghash)
        self.write({
            "permitted_amount": max_per_mint,
            "signer_address": account.address,
            "signature": sign.signature.hex(),
            "address": address
        })


def make_app():
    return tornado.web.Application([
        (r"/api/v1/ethsign/(0[xX][0-9a-fA-F]{40})", EthSignHandler),
    ])


if __name__ == "__main__":
    app = make_app()
    app.listen(3000)
    tornado.ioloop.IOLoop.current().start()

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