bitrequests.py 文件源码

def make_402_payment(self, response, max_price):
        """Make a bit-transfer payment to the payment-handling service."""
        # Retrieve payment headers
        headers = response.headers
        price = headers.get(BitTransferRequests.HTTP_BITCOIN_PRICE)
        payee_address = headers.get(BitTransferRequests.HTTP_BITCOIN_ADDRESS)
        payee_username = headers.get(BitTransferRequests.HTTP_BITCOIN_USERNAME)

        # Verify that the payment method is supported
        if price is None or payee_address is None or payee_username is None:
            raise UnsupportedPaymentMethodError(
                'Resource does not support that payment method.')

        # Convert string headers into correct data types
        price = int(price)

        # verify that we have the money to purchase the resource
        buffer_balance = self.client.get_earnings()["total_earnings"]
        if price > buffer_balance:
            insuff_funds_err = 'Resource price ({}) exceeds buffer balance ({}).'
            raise InsufficientBalanceError(insuff_funds_err.format(price, buffer_balance))

        # Verify resource cost against our budget
        if max_price and price > max_price:
            max_price_err = 'Resource price ({}) exceeds max price ({}).'
            raise ResourcePriceGreaterThanMaxPriceError(max_price_err.format(price, max_price))

        # Get the signing public key
        pubkey = self.wallet.get_public_key()
        compressed_pubkey = codecs.encode(pubkey.compressed_bytes, 'base64').decode()

        # Create and sign BitTranfer
        bittransfer = json.dumps({
            'payer': self.username,
            'payer_pubkey': compressed_pubkey,
            'payee_address': payee_address,
            'payee_username': payee_username,
            'amount': price,
            'timestamp': time.time(),
            'description': response.url
        })
        if not isinstance(bittransfer, str):
            raise TypeError("Serialized bittransfer must be a string")
        signature = self.wallet.sign_message(bittransfer)
        logger.debug('[BitTransferRequests] Signature: {}'.format(signature))
        logger.debug('[BitTransferRequests] BitTransfer: {}'.format(bittransfer))
        return {
            'Bitcoin-Transfer': bittransfer,
            'Authorization': signature
        }