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src/HeaderList.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace HttpSignatures;
+
+class HeaderList
+{
+    /** @var array */
+    public $names;
+
+    /**
+     * @param array $names
+     */
+    public function __construct(array $names)
+    {
+        $this->names = array_map(
+            [$this, 'normalize'],
+            $names
+        );
+    }
+
+    /**
+     * @param $string
+     *
+     * @return HeaderList
+     */
+    public static function fromString($string)
+    {
+        return new static(explode(' ', $string));
+    }
+
+    /**
+     * @return string
+     */
+    public function string()
+    {
+        return implode(' ', $this->names);
+    }
+
+    /**
+     * @param $name
+     *
+     * @return string
+     */
+    private function normalize($name)
+    {
+        return strtolower($name);
+    }
+}