Initial importv0.1.0

1 files changed, 50 insertions, 0 deletions

diff --git a/lib/cepis/Response.php b/lib/cepis/Response.php
new file mode 100644
index 0000000..f0ecb8d
--- /dev/null
+++ b/lib/cepis/Response.php
@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Cepis;
+
+/**
+ * What a {@see Transport} hands back: an HTTP status, the response headers and
+ * the body as a string.
+ *
+ * Deliberately not a PSR-7 message. This library makes one GET and needs three
+ * things out of it; a plain value object keeps the {@see Transport} interface
+ * implementable in a few lines against whatever HTTP layer the host
+ * application already has.
+ */
+final class Response
+{
+    /**
+     * @param array<string, string|list<string>> $headers Response headers.
+     *     Keys may be in any case and values may be a single string or a list
+     *     of them; {@see Response::header()} handles both, so an implementer
+     *     can pass through whatever their HTTP layer produced.
+     */
+    public function __construct(
+        public readonly int $status,
+        public readonly array $headers = [],
+        public readonly string $body = '',
+    ) {
+    }
+
+    /**
+     * Look a header up case-insensitively, returning the first value or `null`
+     * when it is absent.
+     */
+    public function header(string $name): ?string
+    {
+        foreach ($this->headers as $key => $value) {
+            if (strcasecmp((string) $key, $name) !== 0) {
+                continue;
+            }
+            if (is_array($value)) {
+                $value = $value[array_key_first($value)] ?? null;
+            }
+
+            return is_scalar($value) ? (string) $value : null;
+        }
+
+        return null;
+    }
+}