added Request::getOrigin()

src/Http/Request.php

@@ -241,6 +241,22 @@ public function getReferer(): ?UrlImmutable
 	}
 
 
+	/**
+	 * What origin did the user come from? It contains scheme, hostname and port.
+	 */
+	public function getOrigin(): ?UrlImmutable
+	{
+		$header = $this->headers['origin'] ?? 'null';
+		try {
+			return $header === 'null'
+				? null
+				: new UrlImmutable($header);
+		} catch (Nette\InvalidArgumentException $e) {
+			return null;
+		}
+	}
+
+
 	/**
 	 * Is the request sent via secure channel (https)?
 	 */

tests/Http/Request.getOrigin.phpt

@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+use Nette\Http;
+use Nette\Http\UrlImmutable;
+use Tester\Assert;
+
+require __DIR__ . '/../bootstrap.php';
+
+
+test('missing origin', function () {
+	$_SERVER = [];
+	$factory = new Http\RequestFactory;
+	$request = $factory->fromGlobals();
+
+	Assert::null($request->getOrigin());
+});
+
+
+test('opaque origin', function () {
+	$_SERVER = [
+		'HTTP_ORIGIN' => 'null',
+	];
+	$factory = new Http\RequestFactory;
+	$request = $factory->fromGlobals();
+
+	Assert::null($request->getOrigin());
+});
+
+
+test('normal origin', function () {
+	$_SERVER = [
+		'HTTP_ORIGIN' => 'https://nette.org',
+	];
+	$factory = new Http\RequestFactory;
+	$request = $factory->fromGlobals();
+
+	Assert::equal(new UrlImmutable('https://nette.org'), $request->getOrigin());
+});