add nip59 (#438)

* feat(nip59) add nip59 based on https://nips.nostr.com/59

* fix(nip59) export the code as nip59

* Update nip59.ts

Co-authored-by: Asai Toshiya <to.asai.60@gmail.com>

* fix(nip59) change GiftWrap kind and using kinds from kinds.ts

---------

Co-authored-by: Asai Toshiya <to.asai.60@gmail.com>

nip59.test.ts

@@ -0,0 +1,49 @@
+import { test, expect } from 'bun:test'
+import { wrapEvent, unwrapEvent } from './nip59.ts'
+import { decode } from './nip19.ts'
+import { getPublicKey } from './pure.ts'
+
+
+const senderPrivateKey = decode(`nsec1p0ht6p3wepe47sjrgesyn4m50m6avk2waqudu9rl324cg2c4ufesyp6rdg`).data
+const recipientPrivateKey = decode(`nsec1uyyrnx7cgfp40fcskcr2urqnzekc20fj0er6de0q8qvhx34ahazsvs9p36`).data
+const recipientPublicKey = getPublicKey(recipientPrivateKey)
+const event = {
+  kind: 1,
+  content: "Are you going to the party tonight?",
+}
+
+const wrapedEvent = wrapEvent(event, senderPrivateKey, recipientPublicKey)
+
+test('wrapEvent', () => {
+  const expected = {
+    content: '', id: '', created_at: 1728537932, kind: 1059, pubkey: '', sig: '', tags: [
+      [
+        "p",
+        "166bf3765ebd1fc55decfe395beff2ea3b2a4e0a8946e7eb578512b555737c99"
+      ]
+    ],
+    [Symbol('verified')]: true,
+  }
+  const result = wrapEvent(event, senderPrivateKey, recipientPublicKey)
+
+  expect(result.kind).toEqual(expected.kind)
+  expect(result.tags).toEqual(expected.tags)
+
+})
+
+test('unwrapEvent', () => {
+  const expected = {
+    kind: 1,
+    content: "Are you going to the party tonight?",
+    pubkey: "611df01bfcf85c26ae65453b772d8f1dfd25c264621c0277e1fc1518686faef9",
+    tags: [],
+  }
+  const result = unwrapEvent(wrapedEvent, recipientPrivateKey)
+
+  expect(result.kind).toEqual(expected.kind)
+  expect(result.content).toEqual(expected.content)
+  expect(result.pubkey).toEqual(expected.pubkey)
+  expect(result.tags).toEqual(expected.tags)
+
+})
+