Start simplifying LNURL code with NLib

src/deps.ts

@@ -87,8 +87,9 @@ export { default as stringifyStable } from 'npm:fast-stable-stringify@^1.0.0';
 // @deno-types="npm:@types/debug@^4.1.12"
 export { default as Debug } from 'npm:debug@^4.3.4';
 export {
+  LNURL,
   type MapCache,
   NIP05,
-} from 'https://gitlab.com/soapbox-pub/nlib/-/raw/46be9e985950547574b1735d0ae52a6a7217d056/mod.ts';
+} from 'https://gitlab.com/soapbox-pub/nlib/-/raw/137af48cbc2639a8969d233fc24d2b959f34782a/mod.ts';
 
 export type * as TypeFest from 'npm:type-fest@^4.3.0';

src/pipeline.ts

@@ -2,16 +2,15 @@ import { Conf } from '@/config.ts';
 import { addRelays } from '@/db/relays.ts';
 import { deleteAttachedMedia } from '@/db/unattached-media.ts';
 import { findUser } from '@/db/users.ts';
-import { Debug, type Event } from '@/deps.ts';
+import { Debug, type Event, LNURL } from '@/deps.ts';
 import { isEphemeralKind } from '@/kinds.ts';
 import { isLocallyFollowed } from '@/queries.ts';
-import { lnurlCallbackResponseSchema, lnurlResponseSchema } from '@/schemas/lnurl.ts';
+import { lnurlCallbackResponseSchema } from '@/schemas/lnurl.ts';
 import { updateStats } from '@/stats.ts';
 import { client, eventsDB, memorelay, reqmeister } from '@/storages.ts';
 import { Sub } from '@/subs.ts';
 import { getTagSet } from '@/tags.ts';
 import { type EventData } from '@/types.ts';
-import { lnurlDecode } from '@/utils/lnurl.ts';
 import { eventAge, isRelay, nostrDate, nostrNow, Time } from '@/utils.ts';
 import { fetchWorker } from '@/workers/fetch.ts';
 import { TrendsWorker } from '@/workers/trends.ts';
@@ -170,12 +169,9 @@ async function submitZaps(event: Event, data: EventData, signal = AbortSignal.ti
     const amount = event.tags.find(([name]) => name === 'amount')?.[1];
     if (lnurl && amount) {
       try {
-        const url = lnurlDecode(lnurl);
-        const response = await fetchWorker(url, { signal });
-        const json = await response.json();
-        const result = lnurlResponseSchema.parse(json);
-        if (result.tag === 'payRequest' && result.allowsNostr && result.nostrPubkey) {
-          const callback = new URL(result.callback);
+        const details = await LNURL.lookup(lnurl, { fetch: fetchWorker, signal });
+        if (details.tag === 'payRequest' && details.allowsNostr && details.nostrPubkey) {
+          const callback = new URL(details.callback);
           const params = new URLSearchParams();
           params.set('amount', amount);
           params.set('nostr', JSON.stringify(event));

src/schemas/lnurl.ts

@@ -1,20 +1,8 @@
 import { z } from '@/deps.ts';
 
-import { nostrIdSchema } from './nostr.ts';
-
-const lnurlResponseSchema = z.object({
-  callback: z.string().url(),
-  maxSendable: z.number().int().nonnegative(),
-  minSendable: z.number().int().positive(),
-  metadata: z.string(),
-  tag: z.string(),
-  allowsNostr: z.boolean().optional(),
-  nostrPubkey: nostrIdSchema.optional(),
-});
-
 const lnurlCallbackResponseSchema = z.object({
   pr: z.string(),
   routes: z.unknown().array(),
 });
 
-export { lnurlCallbackResponseSchema, lnurlResponseSchema };
+export { lnurlCallbackResponseSchema };

src/utils/lnurl.test.ts

@@ -1,14 +0,0 @@
-import { assertEquals } from '@/deps-test.ts';
-
-import { lnurlDecode, lnurlEncode } from './lnurl.ts';
-
-const lnurl = 'lnurl1dp68gurn8ghj7um5v93kketj9ehx2amn9uh8wetvdskkkmn0wahz7mrww4excup0dajx2mrv92x9xp';
-const url = 'https://stacker.news/.well-known/lnurlp/odell';
-
-Deno.test('lnurlEncode', () => {
-  assertEquals(lnurlEncode(url), lnurl);
-});
-
-Deno.test('lnurlDecode', () => {
-  assertEquals(lnurlDecode(lnurl), url);
-});

src/utils/lnurl.ts

@@ -1,19 +1,4 @@
-import { bech32 } from '@/deps.ts';
-
-/** Encode a URL to LNURL format. */
-function lnurlEncode(url: string, limit = 2000): `lnurl1${string}` {
-  const data = new TextEncoder().encode(url);
-  const words = bech32.toWords(data);
-  return bech32.encode('lnurl', words, limit);
-}
-
-/** Decode a LNURL into a URL. */
-function lnurlDecode(lnurl: string, limit = 2000): string {
-  const { prefix, words } = bech32.decode(lnurl, limit);
-  if (prefix !== 'lnurl') throw new Error('Invalid LNURL');
-  const data = new Uint8Array(bech32.fromWords(words));
-  return new TextDecoder().decode(data);
-}
+import { LNURL } from '@/deps.ts';
 
 /** Get an LNURL from a lud06 or lud16. */
 function getLnurl({ lud06, lud16 }: { lud06?: string; lud16?: string }, limit?: number): string | undefined {
@@ -21,10 +6,10 @@ function getLnurl({ lud06, lud16 }: { lud06?: string; lud16?: string }, limit?:
   if (lud16) {
     const [name, host] = lud16.split('@');
     if (name && host) {
-      const url = new URL(`/.well-known/lnurlp/${name}`, `https://${host}`).toString();
-      return lnurlEncode(url, limit);
+      const url = new URL(`/.well-known/lnurlp/${name}`, `https://${host}`);
+      return LNURL.encode(url, limit);
     }
   }
 }
 
-export { getLnurl, lnurlDecode, lnurlEncode };
+export { getLnurl };