mirror of
https://github.com/lnbits/lnbits-legend.git
synced 2025-02-25 07:07:48 +01:00
110 lines
3.7 KiB
Python
110 lines
3.7 KiB
Python
import json
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import time
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from typing import NamedTuple, Dict
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from lnbits import bolt11
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from lnbits.core.services import pay_invoice
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from . import db
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from .helpers import get_callback_url, LnurlValidationError
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class Bleskomat(NamedTuple):
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id: str
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wallet: str
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api_key_id: str
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api_key_secret: str
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api_key_encoding: str
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name: str
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fiat_currency: str
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exchange_rate_provider: str
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fee: str
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class BleskomatLnurl(NamedTuple):
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id: str
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bleskomat: str
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wallet: str
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hash: str
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tag: str
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params: str
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api_key_id: str
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initial_uses: int
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remaining_uses: int
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created_time: int
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updated_time: int
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def has_uses_remaining(self) -> bool:
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# When initial uses is 0 then the LNURL has unlimited uses.
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return self.initial_uses == 0 or self.remaining_uses > 0
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def get_info_response_object(self, secret: str) -> Dict[str, str]:
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tag = self.tag
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params = json.loads(self.params)
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response = { "tag": tag }
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if tag == "withdrawRequest":
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for key in ["minWithdrawable", "maxWithdrawable", "defaultDescription"]:
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response[key] = params[key]
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response["callback"] = get_callback_url()
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response["k1"] = secret
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return response
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def validate_action(self, query: Dict[str, str]) -> None:
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tag = self.tag
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params = json.loads(self.params)
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# Perform tag-specific checks.
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if tag == "withdrawRequest":
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for field in ["pr"]:
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if not field in query:
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raise LnurlValidationError(f"Missing required parameter: \"{field}\"")
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# Check the bolt11 invoice(s) provided.
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pr = query["pr"]
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if "," in pr:
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raise LnurlValidationError("Multiple payment requests not supported")
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try:
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invoice = bolt11.decode(pr)
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except ValueError as e:
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raise LnurlValidationError("Invalid parameter (\"pr\"): Lightning payment request expected")
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if invoice.amount_msat < params["minWithdrawable"]:
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raise LnurlValidationError("Amount in invoice must be greater than or equal to \"minWithdrawable\"")
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if invoice.amount_msat > params["maxWithdrawable"]:
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raise LnurlValidationError("Amount in invoice must be less than or equal to \"maxWithdrawable\"")
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else:
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raise LnurlValidationError(f"Unknown subprotocol: \"{tag}\"")
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async def execute_action(self, query: Dict[str, str]):
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self.validate_action(query)
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used = False
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if self.initial_uses > 0:
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await db.commit()
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await db.begin()
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used = await self.use()
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if not used:
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await db.rollback()
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raise LnurlValidationError("Maximum number of uses already reached")
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try:
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tag = self.tag
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if tag == "withdrawRequest":
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payment_hash = await pay_invoice(
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wallet_id=self.wallet,
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payment_request=query["pr"],
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)
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if not payment_hash:
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raise LnurlValidationError("Failed to pay invoice")
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except Exception as e:
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if used:
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await db.rollback()
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raise e
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if used:
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await db.commit()
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async def use(self) -> bool:
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now = int(time.time())
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result = await db.execute(
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"""
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UPDATE bleskomat_lnurls
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SET remaining_uses = remaining_uses - 1, updated_time = ?
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WHERE id = ?
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AND remaining_uses > 0
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""",
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(now, self.id)
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)
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return result.rowcount > 0
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