symfony · samybasset · Feb 2, 2023
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
@@ -49,6 +49,7 @@
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\DependencyInjection\Alias;
 use Symfony\Component\DependencyInjection\Argument\ServiceClosureArgument;
+use Symfony\Component\DependencyInjection\Attribute\AsAlias;
 use Symfony\Component\DependencyInjection\ChildDefinition;
 use Symfony\Component\DependencyInjection\Compiler\ServiceLocatorTagPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
@@ -686,6 +687,10 @@ public function load(array $configs, ContainerBuilder $container)
             $definition->addTag('messenger.message_handler', $tagAttributes);
         });
 
+        $container->registerAttributeForAutoconfiguration(AsAlias::class, static function (ChildDefinition $definition, AsAlias $attribute, \ReflectionClass $reflector): void {
+            $definition->addTag(AsAlias::class, ['alias' => $attribute->alias]);
+        });
+
         if (!$container->getParameter('kernel.debug')) {
             // remove tagged iterator argument for resource checkers
             $container->getDefinition('config_cache_factory')->setArguments([]);

diff --git a/src/Symfony/Component/DependencyInjection/Attribute/AsAlias.php b/src/Symfony/Component/DependencyInjection/Attribute/AsAlias.php
@@ -0,0 +1,21 @@
+<?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\Component\DependencyInjection\Attribute;
+
+#[\Attribute(\Attribute::TARGET_CLASS)]
+class AsAlias
+{
+    public function __construct(
+        public string $alias,
+    ) {
+    }
+}
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/AliasPass.php b/src/Symfony/Component/DependencyInjection/Compiler/AliasPass.php
@@ -0,0 +1,32 @@
+<?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\Component\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\Attribute\AsAlias;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
+
+final class AliasPass implements CompilerPassInterface
+{
+    public function process(ContainerBuilder $container)
+    {
+        foreach ($container->findTaggedServiceIds(AsAlias::class) as $serviceId => $tags) {
+            foreach ($tags as $tag) {
+                if (false === isset($tag['alias'])) {
+                    throw new InvalidArgumentException(sprintf('The "alias" attribute is mandatory for the "%s" tag.', AsAlias::class));
+                }
+
+                $container->setAlias($tag['alias'], $serviceId);
+            }
+        }
+    }
+}
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/PassConfig.php b/src/Symfony/Component/DependencyInjection/Compiler/PassConfig.php
@@ -76,6 +76,7 @@ public function __construct()
             new CheckCircularReferencesPass(),
             new CheckReferenceValidityPass(),
             new CheckArgumentsValidityPass(false),
+            new AliasPass(),
         ]];
 
         $this->removingPasses = [[

diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/AsAliasAttributeTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/AsAliasAttributeTest.php
@@ -0,0 +1,64 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * 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\Component\DependencyInjection\Tests\Compiler;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\DependencyInjection\Attribute\AsAlias;
+use Symfony\Component\DependencyInjection\ChildDefinition;
+use Symfony\Component\DependencyInjection\Compiler\AliasPass;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+
+final class AsAliasAttributeTest extends TestCase
+{
+    public function testProcessWithMissingAliasAttribute()
+    {
+        $container = new ContainerBuilder();
+
+        $container->register('foo', \DateTimeImmutable::class)
+            ->addTag(AsAlias::class, []);
+
+        self::expectException(\InvalidArgumentException::class);
+
+        (new AliasPass())->process($container);
+    }
+
+    public function testProcess()
+    {
+        $container = new ContainerBuilder();
+
+        $container->register(HelloWorldService::class)
+            ->setAutowired(true)
+            ->setAutoconfigured(true);
+
+        $container->registerAttributeForAutoconfiguration(AsAlias::class, static function (ChildDefinition $definition, AsAlias $attribute, \ReflectionClass $reflector): void {
+            $definition->addTag(
+                AsAlias::class,
+                [
+                    'alias' => $attribute->alias,
+                ]
+            );
+        });
+
+        $container->getCompilerPassConfig()->setRemovingPasses([]);
+        $container->compile();
+
+        self::assertTrue($container->hasAlias('bar'));
+        self::assertSame(HelloWorldService::class, (string) $container->getAlias('bar'));
+    }
+}
+
+#[AsAlias(alias: 'bar')]
+class HelloWorldService
+{
+}