lnbits-legend/lnbits/wallets/lndrest.py

from os import getenv
from typing import Optional, Dict
import base64
from requests import get, post
from .base import InvoiceResponse, PaymentResponse, PaymentStatus, Wallet


class LndRestWallet(Wallet):
    """https://api.lightning.community/rest/index.html#lnd-rest-api-reference"""

    def __init__(self):

        endpoint = getenv("LND_REST_ENDPOINT")
        self.endpoint = endpoint[:-1] if endpoint.endswith("/") else endpoint
        print(self.endpoint)
        self.auth_admin = {"Grpc-Metadata-macaroon": getenv("LND_REST_ADMIN_MACAROON")}
        self.auth_invoice = {"Grpc-Metadata-macaroon": getenv("LND_REST_INVOICE_MACAROON")}
        self.auth_read = {"Grpc-Metadata-macaroon": getenv("LND_REST_READ_MACAROON")}
        self.auth_cert = getenv("LND_REST_CERT")

    def create_invoice(
        self, amount: int, memo: Optional[str] = None, description_hash: Optional[bytes] = None
    ) -> InvoiceResponse:
        data: Dict = {
            "value": amount,
            "private": True,
        }
        if description_hash:
            data["description_hash"] = base64.b64encode(description_hash).decode("ascii")
        else:
            data["memo"] = memo or ""

        r = post(url=f"{self.endpoint}/v1/invoices", headers=self.auth_invoice, verify=self.auth_cert, json=data,)

        ok, checking_id, payment_request, error_message = r.ok, None, None, None

        if r.ok:
            data = r.json()
            payment_request = data["payment_request"]

        r = get(url=f"{self.endpoint}/v1/payreq/{payment_request}", headers=self.auth_read, verify=self.auth_cert,)
        print(r)
        if r.ok:
            checking_id = r.json()["payment_hash"].replace("/", "_")
            print(checking_id)
            error_message = None
            ok = True

        return InvoiceResponse(ok, checking_id, payment_request, error_message)

    def pay_invoice(self, bolt11: str) -> PaymentResponse:
        r = post(
            url=f"{self.endpoint}/v1/channels/transactions",
            headers=self.auth_admin,
            verify=self.auth_cert,
            json={"payment_request": bolt11},
        )
        ok, checking_id, fee_msat, error_message = r.ok, None, 0, None
        r = get(url=f"{self.endpoint}/v1/payreq/{bolt11}", headers=self.auth_admin, verify=self.auth_cert,)

        if r.ok:
            checking_id = r.json()["payment_hash"]
        else:
            error_message = r.json()["error"]

        return PaymentResponse(ok, checking_id, fee_msat, error_message)

    def get_invoice_status(self, checking_id: str) -> PaymentStatus:
        checking_id = checking_id.replace("_", "/")
        print(checking_id)
        r = get(url=f"{self.endpoint}/v1/invoice/{checking_id}", headers=self.auth_invoice, verify=self.auth_cert,)
        print(r.json()["settled"])
        if not r or r.json()["settled"] == False:
            return PaymentStatus(None)

        return PaymentStatus(r.json()["settled"])

    def get_payment_status(self, checking_id: str) -> PaymentStatus:
        r = get(
            url=f"{self.endpoint}/v1/payments",
            headers=self.auth_admin,
            verify=self.auth_cert,
            params={"include_incomplete": "True", "max_payments": "20"},
        )

        if not r.ok:
            return PaymentStatus(None)

        payments = [p for p in r.json()["payments"] if p["payment_hash"] == checking_id]
        print(checking_id)
        payment = payments[0] if payments else None

        # check payment.status: https://api.lightning.community/rest/index.html?python#peersynctype
        statuses = {"UNKNOWN": None, "IN_FLIGHT": None, "SUCCEEDED": True, "FAILED": False}

        return PaymentStatus(statuses[payment["status"]])