mirror of
https://github.com/lnbits/lnbits-legend.git
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108 lines
3.4 KiB
Python
108 lines
3.4 KiB
Python
import hashlib
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import math
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from http import HTTPStatus
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from fastapi import Request
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from lnurl import LnurlErrorResponse, LnurlPayActionResponse, LnurlPayResponse
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from starlette.exceptions import HTTPException
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from lnbits.core.services import create_invoice
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from lnbits.utils.exchange_rates import get_fiat_rate_satoshis
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from . import lnurlp_ext
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from .crud import increment_pay_link
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@lnurlp_ext.get(
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"/api/v1/lnurl/{link_id}", # Backwards compatibility for old LNURLs / QR codes (with long URL)
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status_code=HTTPStatus.OK,
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name="lnurlp.api_lnurl_response.deprecated",
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)
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@lnurlp_ext.get(
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"/{link_id}",
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status_code=HTTPStatus.OK,
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name="lnurlp.api_lnurl_response",
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)
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async def api_lnurl_response(request: Request, link_id):
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link = await increment_pay_link(link_id, served_meta=1)
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if not link:
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raise HTTPException(
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status_code=HTTPStatus.NOT_FOUND, detail="Pay link does not exist."
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)
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rate = await get_fiat_rate_satoshis(link.currency) if link.currency else 1
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resp = LnurlPayResponse(
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callback=request.url_for("lnurlp.api_lnurl_callback", link_id=link.id),
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min_sendable=round(link.min * rate) * 1000,
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max_sendable=round(link.max * rate) * 1000,
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metadata=link.lnurlpay_metadata,
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)
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params = resp.dict()
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if link.comment_chars > 0:
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params["commentAllowed"] = link.comment_chars
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return params
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@lnurlp_ext.get(
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"/api/v1/lnurl/cb/{link_id}",
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status_code=HTTPStatus.OK,
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name="lnurlp.api_lnurl_callback",
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)
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async def api_lnurl_callback(request: Request, link_id):
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link = await increment_pay_link(link_id, served_pr=1)
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if not link:
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raise HTTPException(
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status_code=HTTPStatus.NOT_FOUND, detail="Pay link does not exist."
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)
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min, max = link.min, link.max
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rate = await get_fiat_rate_satoshis(link.currency) if link.currency else 1
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if link.currency:
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# allow some fluctuation (as the fiat price may have changed between the calls)
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min = rate * 995 * link.min
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max = rate * 1010 * link.max
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else:
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min = link.min * 1000
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max = link.max * 1000
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amount_received = int(request.query_params.get("amount") or 0)
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if amount_received < min:
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return LnurlErrorResponse(
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reason=f"Amount {amount_received} is smaller than minimum {min}."
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).dict()
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elif amount_received > max:
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return LnurlErrorResponse(
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reason=f"Amount {amount_received} is greater than maximum {max}."
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).dict()
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comment = request.query_params.get("comment")
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if len(comment or "") > link.comment_chars:
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return LnurlErrorResponse(
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reason=f"Got a comment with {len(comment)} characters, but can only accept {link.comment_chars}"
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).dict()
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payment_hash, payment_request = await create_invoice(
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wallet_id=link.wallet,
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amount=int(amount_received / 1000),
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memo=link.description,
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unhashed_description=link.lnurlpay_metadata.encode(),
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extra={
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"tag": "lnurlp",
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"link": link.id,
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"comment": comment,
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"extra": request.query_params.get("amount"),
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},
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)
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success_action = link.success_action(payment_hash)
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if success_action:
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resp = LnurlPayActionResponse(
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pr=payment_request, success_action=success_action, routes=[]
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)
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else:
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resp = LnurlPayActionResponse(pr=payment_request, routes=[])
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return resp.dict()
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