add basic auth support

src/Support/BasicAuth.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Shield\Shield\Support;
+
+use Illuminate\Http\Request;
+
+trait BasicAuth
+{
+    /**
+     * @param \Illuminate\Http\Request $request
+     * @param string                   $username
+     * @param string                   $password
+     *
+     * @return bool
+     */
+    public function checkBasic(Request $request, string $username, string $password): bool
+    {
+        if ($request->hasHeader('PHP-AUTH-USER') && $request->hasHeader('PHP-AUTH-PW')) {
+            return $request->header('PHP-AUTH-USER') == $username && $request->header('PHP-AUTH-PW') == $password;
+        }
+
+        return false;
+    }
+}

tests/Unit/Support/BasicAuthTest.php

@@ -0,0 +1,69 @@
+<?php
+
+namespace Shield\Shield\Test\Unit\Support;
+
+use Illuminate\Http\Request;
+use Illuminate\Support\Collection;
+use PHPUnit\Framework\Assert;
+use Shield\Shield\Contracts\Service;
+use Shield\Shield\Support\BasicAuth;
+use Shield\Testing\TestCase;
+
+/**
+ * Class BasicAuthTest
+ *
+ * @package \Shield\Shield\Test\Unit\Support
+ */
+class BasicAuthTest extends TestCase
+{
+    /**
+     * @var \Shield\Shield\Test\Unit\Support\Example
+     */
+    private $service;
+
+    public function setUp()
+    {
+        parent::setUp();
+
+        $this->service = new Example;
+    }
+
+    /** @test */
+    public function it_will_fail_if_invalid_credentials()
+    {
+        $request = $this->request();
+        $request->headers->add([
+            'PHP-AUTH-USER' => 'user',
+            'PHP-AUTH-PW' => 'password',
+        ]);
+
+        Assert::assertFalse($this->service->checkBasic($request, 'user', 'pass'));
+    }
+
+    /** @test */
+    public function it_will_pass_if_correct_credentials()
+    {
+        $request = $this->request();
+        $request->headers->add([
+            'PHP-AUTH-USER' => 'user',
+            'PHP-AUTH-PW' => 'pass',
+        ]);
+
+        Assert::assertTrue($this->service->checkBasic($request, 'user', 'pass'));
+    }
+}
+
+class Example implements Service {
+
+    use BasicAuth;
+
+    public function verify(Request $request, Collection $config): bool
+    {
+        return true;
+    }
+
+    public function headers(): array
+    {
+        return [];
+    }
+}