60 lines
1.3 KiB
TypeScript
60 lines
1.3 KiB
TypeScript
import * as secp from "@noble/secp256k1";
|
|
import { bech32 } from "bech32";
|
|
|
|
export enum NostrPrefix {
|
|
PublicKey = "npub",
|
|
PrivateKey = "nsec",
|
|
Note = "note",
|
|
|
|
// TLV prefixes
|
|
Profile = "nprofile",
|
|
Event = "nevent",
|
|
Relay = "nrelay",
|
|
}
|
|
|
|
export interface TLVEntry {
|
|
type: number;
|
|
length: number;
|
|
value: string; // hex encoded data
|
|
}
|
|
|
|
export function encodeTLV(hex: string, prefix: NostrPrefix, relays?: string[]) {
|
|
if (typeof hex !== "string" || hex.length === 0 || hex.length % 2 !== 0) {
|
|
return "";
|
|
}
|
|
|
|
const enc = new TextEncoder();
|
|
const buf = secp.utils.hexToBytes(hex);
|
|
|
|
const tl0 = [0, buf.length, ...buf];
|
|
const tl1 =
|
|
relays
|
|
?.map((a) => {
|
|
const data = enc.encode(a);
|
|
return [1, data.length, ...data];
|
|
})
|
|
.flat() ?? [];
|
|
|
|
return bech32.encode(prefix, bech32.toWords([...tl0, ...tl1]));
|
|
}
|
|
|
|
export function decodeTLV(str: string) {
|
|
const decoded = bech32.decode(str);
|
|
const data = bech32.fromWords(decoded.words);
|
|
|
|
const entries: TLVEntry[] = [];
|
|
let x = 0;
|
|
while (x < data.length) {
|
|
const t = data[x];
|
|
const l = data[x + 1];
|
|
const v = data.slice(x + 2, x + 2 + l);
|
|
entries.push({
|
|
type: t,
|
|
length: l,
|
|
value: secp.utils.bytesToHex(new Uint8Array(v)),
|
|
});
|
|
x += 2 + l;
|
|
}
|
|
return entries;
|
|
}
|