coinos-server.git - coinos server — legacy coinos.io backend (Lightning, on-chain, Liquid)

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raceback */ .highlight .kc { color: #080; font-weight: bold } /* Keyword.Constant */ .highlight .kd { color: #080; font-weight: bold } /* Keyword.Declaration */ .highlight .kn { color: #080; font-weight: bold } /* Keyword.Namespace */ .highlight .kp { color: #080 } /* Keyword.Pseudo */ .highlight .kr { color: #080; font-weight: bold } /* Keyword.Reserved */ .highlight .kt { color: #888; font-weight: bold } /* Keyword.Type */ .highlight .m { color: #00D; font-weight: bold } /* Literal.Number */ .highlight .s { color: #D20; background-color: #FFF0F0 } /* Literal.String */ .highlight .na { color: #369 } /* Name.Attribute */ .highlight .nb { color: #038 } /* Name.Builtin */ .highlight .nc { color: #B06; font-weight: bold } /* Name.Class */ .highlight .no { color: #036; font-weight: bold } /* Name.Constant */ .highlight .nd { color: #555 } /* Name.Decorator */ .highlight .ne { color: #B06; font-weight: bold } /* Name.Exception */ .highlight .nf { color: #06B; font-weight: bold } /* Name.Function */ .highlight .nl { color: #369; font-style: italic } /* Name.Label */ .highlight .nn { color: #B06; font-weight: bold } /* Name.Namespace */ .highlight .py { color: #369; font-weight: bold } /* Name.Property */ .highlight .nt { color: #B06; font-weight: bold } /* Name.Tag */ .highlight .nv { color: #369 } /* Name.Variable */ .highlight .ow { color: #080 } /* Operator.Word */ .highlight .w { color: #BBB } /* Text.Whitespace */ .highlight .mb { color: #00D; font-weight: bold } /* Literal.Number.Bin */ .highlight .mf { color: #00D; font-weight: bold } /* Literal.Number.Float */ .highlight .mh { color: #00D; font-weight: bold } /* Literal.Number.Hex */ .highlight .mi { color: #00D; font-weight: bold } /* Literal.Number.Integer */ .highlight .mo { color: #00D; font-weight: bold } /* Literal.Number.Oct */ .highlight .sa { color: #D20; background-color: #FFF0F0 } /* Literal.String.Affix */ .highlight .sb { color: #D20; background-color: #FFF0F0 } /* Literal.String.Backtick */ .highlight .sc { color: #D20; background-color: #FFF0F0 } /* Literal.String.Char */ .highlight .dl { color: #D20; background-color: #FFF0F0 } /* Literal.String.Delimiter */ .highlight .sd { color: #D20; background-color: #FFF0F0 } /* Literal.String.Doc */ .highlight .s2 { color: #D20; background-color: #FFF0F0 } /* Literal.String.Double */ .highlight .se { color: #04D; background-color: #FFF0F0 } /* Literal.String.Escape */ .highlight .sh { color: #D20; background-color: #FFF0F0 } /* Literal.String.Heredoc */ .highlight .si { color: #33B; background-color: #FFF0F0 } /* Literal.String.Interpol */ .highlight .sx { color: #2B2; background-color: #F0FFF0 } /* Literal.String.Other */ .highlight .sr { color: #080; background-color: #FFF0FF } /* Literal.String.Regex */ .highlight .s1 { color: #D20; background-color: #FFF0F0 } /* Literal.String.Single */ .highlight .ss { color: #A60; background-color: #FFF0F0 } /* Literal.String.Symbol */ .highlight .bp { color: #038 } /* Name.Builtin.Pseudo */ .highlight .fm { color: #06B; font-weight: bold } /* Name.Function.Magic */ .highlight .vc { color: #369 } /* Name.Variable.Class */ .highlight .vg { color: #D70 } /* Name.Variable.Global */ .highlight .vi { color: #33B } /* Name.Variable.Instance */ .highlight .vm { color: #369 } /* Name.Variable.Magic */ .highlight .il { color: #00D; font-weight: bold } /* Literal.Number.Integer.Long */

// CLINK offer codes (`noffer1…`) — a static, nostr-native payment code.
// Bech32 over TLV: 0 = service pubkey (32B), 1 = relay url, 2 = offer id,
// 3 = pricing type (2 = payer chooses the amount). A payer decodes this,
// sends a NIP-44-encrypted kind-21001 request to the pubkey via the relay,
// and gets an invoice back — no web server involved.

import { bech32 } from '@scure/base';
import { hex } from '@scure/base';

const te = new TextEncoder();
const td = new TextDecoder();

function tlv(items) {
  const parts = [];
  for (const [type, value] of items) {
    if (value.length > 255) throw new Error('tlv value too long');
    parts.push(new Uint8Array([type, value.length]), value);
  }
  const total = parts.reduce((n, p) => n + p.length, 0);
  const out = new Uint8Array(total);
  let off = 0;
  for (const p of parts) { out.set(p, off); off += p.length; }
  return out;
}

export function encodeNoffer({ pubkey, relay, offerId, priceType = 2 }) {
  const data = tlv([
    [0, hex.decode(pubkey)],
    [1, te.encode(relay)],
    [2, te.encode(offerId)],
    [3, new Uint8Array([priceType])],
  ]);
  return bech32.encode('noffer', bech32.toWords(data), 2000);
}

export function decodeNoffer(str) {
  const { prefix, words } = bech32.decode(String(str).trim(), 2000);
  if (prefix !== 'noffer') throw new Error('not an offer code');
  const data = bech32.fromWords(words);
  const out = {};
  let off = 0;
  while (off + 2 <= data.length) {
    const type = data[off], len = data[off + 1];
    const value = data.slice(off + 2, off + 2 + len);
    off += 2 + len;
    if (type === 0) out.pubkey = hex.encode(value);
    else if (type === 1) out.relay = td.decode(value);
    else if (type === 2) out.offerId = td.decode(value);
    else if (type === 3) out.priceType = value[0];
    else if (type === 4) out.priceSats = [...value].reduce((n, b) => n * 256 + b, 0);
    else if (type === 5) out.currency = td.decode(value);
  }
  if (!out.pubkey) throw new Error('offer code has no pubkey');
  return out;
}


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