adds StaticEnvVarLoader as a decorator of SodiumVault

src/Symfony/Bundle/FrameworkBundle/Secrets/StaticEnvVarLoader.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bundle\FrameworkBundle\Secrets;
+
+use Symfony\Component\DependencyInjection\Attribute\AsDecorator;
+use Symfony\Component\DependencyInjection\Attribute\AutowireDecorated;
+use Symfony\Component\DependencyInjection\EnvVarLoaderInterface;
+
+/**
+ * @internal
+ */
+#[AsDecorator('secrets.vault')]
+class StaticEnvVarLoader implements EnvVarLoaderInterface
+{
+    private array $envCache = [];
+
+    public function __construct(
+        #[AutowireDecorated]
+        private EnvVarLoaderInterface $envVarLoader,
+    ) {
+    }
+
+    public function loadEnvVars(): array
+    {
+        if ([] !== $this->envCache) {
+            return $this->envCache;
+        }
+
+        return $this->envCache = $this->envVarLoader->loadEnvVars();
+    }
+}

src/Symfony/Bundle/FrameworkBundle/Tests/Secrets/StaticEnvVarLoaderTest.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bundle\FrameworkBundle\Tests\Secrets;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Bundle\FrameworkBundle\Secrets\StaticEnvVarLoader;
+use Symfony\Component\DependencyInjection\EnvVarLoaderInterface;
+
+class StaticEnvVarLoaderTest extends TestCase
+{
+    public function testLoadEnvVarsCachesInnerLoaderEnvVars()
+    {
+        $innerLoader = new class(['FOO' => 'BAR']) implements EnvVarLoaderInterface {
+            /** @param array<string, string> */
+            public function __construct(public array $envVars = [])
+            {
+            }
+
+            public function loadEnvVars(): array
+            {
+                return $this->envVars;
+            }
+        };
+
+        $loader = new StaticEnvVarLoader($innerLoader);
+        $this->assertSame(['FOO' => 'BAR'], $loader->loadEnvVars());
+
+        $innerLoader->envVars = ['BAR' => 'BAZ'];
+        $this->assertSame(['FOO' => 'BAR'], $loader->loadEnvVars());
+    }
+}