Implement the HTTP response value object

src/ValueObjects/Response.php

@@ -0,0 +1,81 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Cerbero\LazyJsonPages\ValueObjects;
+
+use Cerbero\JsonParser\JsonParser;
+
+/**
+ * The HTTP response.
+ */
+final class Response
+{
+    /**
+     * The headers of the HTTP response.
+     *
+     * @var array<string, string> $headers
+     */
+    public readonly array $headers;
+
+    /**
+     * Instantiate the class.
+     *
+     * @param array<string, string> $headers
+     */
+    public function __construct(public readonly string $json, array $headers)
+    {
+        $this->headers = $this->normalizeHeaders($headers);
+    }
+
+    /**
+     * Normalize the given headers.
+     *
+     * @param array<string, string> $headers
+     * @return array<string, string>
+     */
+    private function normalizeHeaders(array $headers): array
+    {
+        $normalizedHeaders = [];
+
+        foreach ($headers as $name => $value) {
+            $normalizedHeaders[strtolower($name)] = $value;
+        }
+
+        return $normalizedHeaders;
+    }
+
+    /**
+     * Retrieve a value from the body or a header.
+     */
+    public function get(string $key): mixed
+    {
+        return $this->hasHeader($key) ? $this->header($key) : $this->json($key);
+    }
+
+    /**
+     * Determine whether the given header is set.
+     */
+    public function hasHeader(string $header): bool
+    {
+        return isset($this->headers[strtolower($header)]);
+    }
+
+    /**
+     * Retrieve the given header.
+     */
+    public function header(string $header): ?string
+    {
+        return $this->headers[strtolower($header)] ?? null;
+    }
+
+    /**
+     * Retrieve a value from the body.
+     */
+    public function json(string $key): mixed
+    {
+        $array = JsonParser::parse($this->json)->pointer($key)->toArray();
+
+        return empty($array) ? null : current($array);
+    }
+}