[6.x] Fix color mode preference values (#14242)

Author: jasonvarga

src/Auth/User.php

@@ -358,7 +358,9 @@ public function setPreferredLocale($locale)
 
     public function preferredColorMode()
     {
-        return $this->getPreference('color_mode') ?? 'auto';
+        $mode = $this->getPreference('color_mode') ?? 'auto';
+
+        return in_array($mode, ['auto', 'light', 'dark'], true) ? $mode : 'auto';
     }
 
     public function isTwoFactorAuthenticationRequired(): bool

tests/Auth/UserContractTests.php

@@ -357,6 +357,27 @@ public function it_gets_preferred_locale()
         $this->assertEquals('en', $this->user()->preferredLocale());
     }
 
+    #[Test]
+    #[DataProvider('preferredColorModeProvider')]
+    public function it_gets_preferred_color_mode($stored, $expected)
+    {
+        $user = $this->makeUser();
+        $user->setPreference('color_mode', $stored);
+
+        $this->assertEquals($expected, $user->preferredColorMode());
+    }
+
+    public static function preferredColorModeProvider(): array
+    {
+        return [
+            'null' => [null, 'auto'],
+            'light' => ['light', 'light'],
+            'dark' => ['dark', 'dark'],
+            'auto' => ['auto', 'auto'],
+            'invalid' => ['invalid', 'auto'],
+        ];
+    }
+
     #[Test]
     public function it_encrypts_a_password()
     {