rss-nostr-lambda/node_modules/nostr-tools/lib/esm/nip57.js

// nip57.ts
import { bech32 } from "@scure/base";

// event.ts
import { schnorr } from "@noble/curves/secp256k1";
import { sha256 } from "@noble/hashes/sha256";
import { bytesToHex } from "@noble/hashes/utils";

// utils.ts
var utf8Decoder = new TextDecoder("utf-8");
var utf8Encoder = new TextEncoder();

// event.ts
var verifiedSymbol = Symbol("verified");
function serializeEvent(evt) {
  if (!validateEvent(evt))
    throw new Error("can't serialize event with wrong or missing properties");
  return JSON.stringify([0, evt.pubkey, evt.created_at, evt.kind, evt.tags, evt.content]);
}
function getEventHash(event) {
  let eventHash = sha256(utf8Encoder.encode(serializeEvent(event)));
  return bytesToHex(eventHash);
}
var isRecord = (obj) => obj instanceof Object;
function validateEvent(event) {
  if (!isRecord(event))
    return false;
  if (typeof event.kind !== "number")
    return false;
  if (typeof event.content !== "string")
    return false;
  if (typeof event.created_at !== "number")
    return false;
  if (typeof event.pubkey !== "string")
    return false;
  if (!event.pubkey.match(/^[a-f0-9]{64}$/))
    return false;
  if (!Array.isArray(event.tags))
    return false;
  for (let i = 0; i < event.tags.length; i++) {
    let tag = event.tags[i];
    if (!Array.isArray(tag))
      return false;
    for (let j = 0; j < tag.length; j++) {
      if (typeof tag[j] === "object")
        return false;
    }
  }
  return true;
}
function verifySignature(event) {
  if (typeof event[verifiedSymbol] === "boolean")
    return event[verifiedSymbol];
  const hash = getEventHash(event);
  if (hash !== event.id) {
    return event[verifiedSymbol] = false;
  }
  try {
    return event[verifiedSymbol] = schnorr.verify(event.sig, hash, event.pubkey);
  } catch (err) {
    return event[verifiedSymbol] = false;
  }
}

// nip57.ts
var _fetch;
try {
  _fetch = fetch;
} catch {
}
function useFetchImplementation(fetchImplementation) {
  _fetch = fetchImplementation;
}
async function getZapEndpoint(metadata) {
  try {
    let lnurl = "";
    let { lud06, lud16 } = JSON.parse(metadata.content);
    if (lud06) {
      let { words } = bech32.decode(lud06, 1e3);
      let data = bech32.fromWords(words);
      lnurl = utf8Decoder.decode(data);
    } else if (lud16) {
      let [name, domain] = lud16.split("@");
      lnurl = `https://${domain}/.well-known/lnurlp/${name}`;
    } else {
      return null;
    }
    let res = await _fetch(lnurl);
    let body = await res.json();
    if (body.allowsNostr && body.nostrPubkey) {
      return body.callback;
    }
  } catch (err) {
  }
  return null;
}
function makeZapRequest({
  profile,
  event,
  amount,
  relays,
  comment = ""
}) {
  if (!amount)
    throw new Error("amount not given");
  if (!profile)
    throw new Error("profile not given");
  let zr = {
    kind: 9734,
    created_at: Math.round(Date.now() / 1e3),
    content: comment,
    tags: [
      ["p", profile],
      ["amount", amount.toString()],
      ["relays", ...relays]
    ]
  };
  if (event) {
    zr.tags.push(["e", event]);
  }
  return zr;
}
function validateZapRequest(zapRequestString) {
  let zapRequest;
  try {
    zapRequest = JSON.parse(zapRequestString);
  } catch (err) {
    return "Invalid zap request JSON.";
  }
  if (!validateEvent(zapRequest))
    return "Zap request is not a valid Nostr event.";
  if (!verifySignature(zapRequest))
    return "Invalid signature on zap request.";
  let p = zapRequest.tags.find(([t, v]) => t === "p" && v);
  if (!p)
    return "Zap request doesn't have a 'p' tag.";
  if (!p[1].match(/^[a-f0-9]{64}$/))
    return "Zap request 'p' tag is not valid hex.";
  let e = zapRequest.tags.find(([t, v]) => t === "e" && v);
  if (e && !e[1].match(/^[a-f0-9]{64}$/))
    return "Zap request 'e' tag is not valid hex.";
  let relays = zapRequest.tags.find(([t, v]) => t === "relays" && v);
  if (!relays)
    return "Zap request doesn't have a 'relays' tag.";
  return null;
}
function makeZapReceipt({
  zapRequest,
  preimage,
  bolt11,
  paidAt
}) {
  let zr = JSON.parse(zapRequest);
  let tagsFromZapRequest = zr.tags.filter(([t]) => t === "e" || t === "p" || t === "a");
  let zap = {
    kind: 9735,
    created_at: Math.round(paidAt.getTime() / 1e3),
    content: "",
    tags: [...tagsFromZapRequest, ["bolt11", bolt11], ["description", zapRequest]]
  };
  if (preimage) {
    zap.tags.push(["preimage", preimage]);
  }
  return zap;
}
export {
  getZapEndpoint,
  makeZapReceipt,
  makeZapRequest,
  useFetchImplementation,
  validateZapRequest
};