Add base64 encoder (#28)

src/Encoder/Base64ItemEncoder.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Rikudou\DynamoDbCache\Encoder;
+
+final class Base64ItemEncoder implements CacheItemEncoderInterface
+{
+    public function __construct(
+        private CacheItemEncoderInterface $encoder,
+    ) {
+    }
+
+    public function encode(mixed $input): string
+    {
+        return base64_encode($this->encoder->encode($input));
+    }
+
+    public function decode(string $input): mixed
+    {
+        return $this->encoder->decode(base64_decode($input));
+    }
+}

tests/Encoder/Base64ItemEncoderTest.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace Rikudou\Tests\DynamoDbCache\Encoder;
+
+use Rikudou\DynamoDbCache\Encoder\Base64ItemEncoder;
+use PHPUnit\Framework\TestCase;
+use Rikudou\DynamoDbCache\Encoder\CacheItemEncoderInterface;
+use Rikudou\DynamoDbCache\Encoder\JsonItemEncoder;
+use Rikudou\DynamoDbCache\Encoder\SerializeItemEncoder;
+use stdClass;
+
+class TestClass {
+    public string $test = '1';
+    private int $test2 = 10;
+}
+
+class Base64ItemEncoderTest extends TestCase
+{
+    /**
+     * @dataProvider encodeItems
+     */
+    public function testEncode(mixed $item)
+    {
+        /** @var CacheItemEncoderInterface[] $encoders */
+        $encoders = [new JsonItemEncoder(), new SerializeItemEncoder()];
+        foreach ($encoders as $encoder) {
+            $base64encoder = new Base64ItemEncoder($encoder);
+
+            self::assertSame(
+                $encoder->encode($item),
+                base64_decode($base64encoder->encode($item)),
+            );
+
+            $encodedOriginal = $encoder->encode($item);
+            $encodedBase64 = $base64encoder->encode($item);
+
+            self::assertEquals($encoder->decode($encodedOriginal), $base64encoder->decode($encodedBase64));
+        }
+    }
+
+    public function encodeItems(): iterable
+    {
+        yield [1];
+        yield ['test'];
+        yield [3.5];
+        yield [['test']];
+        yield [new stdClass()];
+        yield [new TestClass()];
+    }
+}