add nostr encoding/decoding support

Author: rikmeijer

composer.lock

@@ -0,0 +1,17 @@
+<?php
+
+namespace nostriphant\NIP01;
+
+class Nostr {
+    
+    static function encode(mixed $json) : string {
+        return json_encode($json, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
+    }
+    static function decode(string $json): mixed {
+        $object = json_decode($json, true);
+        if (isset($object) === false) {
+            throw new \InvalidArgumentException('Invalid message');
+        }
+        return $object;
+    }
+}

src/Nostr.php

@@ -0,0 +1,16 @@
+<?php
+
+use nostriphant\NIP01\Nostr;
+
+it('encodes and decodes data', function (mixed $in, string $expected) {
+    $encoded = Nostr::encode($in);
+    expect($encoded)->toBe($expected);
+    expect(Nostr::decode($encoded))->toBe($in);
+})->with([
+    [['this' => 'is data'], json_encode(['this' => 'is data'])]
+]);
+
+
+it('fails when invalid json', function () {
+    expect(fn() => Nostr::decode('{invalid:json}'))->toThrow(\InvalidArgumentException::class);
+});