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import { PUBLIC_DOMAIN } from "$env/static/public";
import getRates from "$lib/rates";
import { auth, fd, get, post } from "$lib/utils";
import { bech32 } from "@scure/base";
import { error, fail, redirect } from "@sveltejs/kit";
const { decode, fromWords } = bech32;
const lnurlFetch = async (url: string) =>
get(`/lnurl/proxy?url=${encodeURIComponent(url)}`);
export async function load({ cookies, params, parent }) {
const { user } = await parent();
const rates = await getRates();
let data;
const { lnurl } = params;
const url = Buffer.from(fromWords(decode(lnurl, 20000).words)).toString();
try {
data = await get(`/decode?text=${lnurl}`);
} catch (e) {
const { message } = e as Error;
error(500, message);
}
let { callback, minSendable, maxSendable, comment, tag } = data;
if (tag === "payRequest" && minSendable === maxSendable) {
minSendable = Math.round(minSendable / 1000);
maxSendable = Math.round(maxSendable / 1000);
const amount = minSendable;
const urlObj = new URL(callback);
urlObj.searchParams.set("amount", (amount * 1000).toString());
if (comment) {
urlObj.searchParams.set("comment", comment);
}
const url = urlObj.toString();
const { pr } = await lnurlFetch(url);
let invoice;
try {
invoice = await get(`/invoice/${pr}`);
} catch (e) {}
if (invoice) redirect(307, `/invoice/${invoice.id}`);
let path = `/send/lightning/${pr}`;
if (comment) path += `/${encodeURIComponent(comment)}`;
redirect(307, path);
} else if (url.startsWith(`https://${PUBLIC_DOMAIN}/`)) {
const username = url.split(`https://${PUBLIC_DOMAIN}/p/`)[1];
if (username) redirect(307, `/pay/${username}`);
}
if (!["payRequest", "withdrawRequest"].includes(data.tag))
error(500, "We only support LNURLp and LNURLw at this time");
data.rate = rates[user?.currency || "USD"];
// Lightning sends draw on the main account; the Max button needs its balance
if (user && data.tag === "payRequest") {
try {
({ balance: data.balance } = await get(`/account/${user.id}`, auth(cookies)));
} catch (e) {}
}
return data;
}
export const actions = {
pay: async ({ fetch, request }) => {
let error;
let { callback, amount, minSendable, maxSendable, comment } =
await fd(request);
minSendable = Math.round(minSendable / 1000);
maxSendable = Math.round(maxSendable / 1000);
if (amount < minSendable)
error = `Amount must be at least ${minSendable} sats`;
if (amount > maxSendable)
error = `Amount must be at most ${maxSendable} sats`;
if (error) return fail(400, { error });
const urlObj = new URL(callback);
urlObj.searchParams.set("amount", (amount * 1000).toString());
if (comment) urlObj.searchParams.set("comment", comment);
const url = urlObj.toString();
const { pr } = await lnurlFetch(url);
let path = `/send/lightning/${pr}`;
if (comment) path += `/${encodeURIComponent(comment)}`;
redirect(307, path);
},
// Send everything to an LNURL-pay endpoint. The routing cost depends on the
// amount and the amount on the routing cost, and the invoice only exists
// once we name an amount — so fetch a probe invoice at the most we could
// possibly send (its destination and route hints are what the quote needs),
// let the server solve for the amount that lands the balance on zero, then
// fetch the real invoice for exactly that amount.
max: async ({ cookies, request }) => {
let { callback, minSendable, maxSendable, comment } = await fd(request);
minSendable = Math.round(minSendable / 1000);
maxSendable = Math.round(maxSendable / 1000);
const user = await get("/me", auth(cookies));
const { balance } = await get(`/account/${user.id}`, auth(cookies));
const ceiling = Math.min(balance, maxSendable);
if (ceiling < minSendable)
return fail(400, { error: `Amount must be at least ${minSendable} sats` });
const invoiceFor = async (amount: number) => {
const urlObj = new URL(callback);
urlObj.searchParams.set("amount", (amount * 1000).toString());
if (comment) urlObj.searchParams.set("comment", comment);
const { pr, reason } = await lnurlFetch(urlObj.toString());
if (!pr) throw new Error(reason || "Could not fetch invoice");
return pr;
};
let pr;
try {
const probe = await invoiceFor(ceiling);
const { amount } = await post(
"/lightning/quote",
{ payreq: probe, max: true, ceiling },
auth(cookies),
);
if (amount < minSendable)
return fail(400, { error: `Amount must be at least ${minSendable} sats` });
pr = await invoiceFor(amount);
} catch (e) {
const { error } = e as Error & { error?: string };
return fail(400, { error: (e as Error).message || error });
}
let path = `/send/lightning/${pr}`;
if (comment) path += `/${encodeURIComponent(comment)}`;
redirect(307, path);
},
withdraw: async ({ cookies, fetch, request }) => {
let error;
let {
callback,
amount,
username,
currency,
minWithdrawable,
maxWithdrawable,
k1,
} = await fd(request);
minWithdrawable = Math.round(minWithdrawable / 1000);
maxWithdrawable = Math.round(maxWithdrawable / 1000);
if (amount < minWithdrawable)
error = `Amount must be at least ${minWithdrawable} sats`;
if (amount > maxWithdrawable)
error = `Amount must be at most ${maxWithdrawable} sats`;
if (error) return fail(400, { error });
const invoice = { amount, type: "lightning" };
const user = { username, currency };
const { text: pr } = await post(
"/invoice",
{ invoice, user },
auth(cookies),
);
const url = new URL(callback);
url.searchParams.append("k1", k1);
url.searchParams.append("pr", pr);
await lnurlFetch(url.toString());
redirect(307, "/payments");
},
};
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