bug #26176 Retro-fit proxy code to make it deterministic for older proxy manager implementations (lstrojny)

This PR was merged into the 3.4 branch.

Discussion
----------

Retro-fit proxy code to make it deterministic for older proxy manager implementations

Follow up on https://github.com/symfony/symfony/issues/25958#issuecomment-365543535

ProxyManager >= 7.2 already implements a deterministic identifier naming strategy which is critical for reproducible builds (https://github.com/symfony/symfony/issues/25958).  but versions below that don’t. This is what this PR fixes. Here is more context: https://github.com/Ocramius/ProxyManager/pull/411

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
-------

0f16056 Retro-fit proxy code to make it deterministic for older proxy manager implementations

src/Symfony/Bridge/ProxyManager/LazyProxy/PhpDumper/ProxyDumper.php

@@ -13,6 +13,7 @@ namespace Symfony\Bridge\ProxyManager\LazyProxy\PhpDumper;
 
 use ProxyManager\Generator\ClassGenerator;
 use ProxyManager\GeneratorStrategy\BaseGeneratorStrategy;
+use ProxyManager\Version;
 use Symfony\Component\DependencyInjection\Container;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\LazyProxy\PhpDumper\DumperInterface;
@@ -94,11 +95,35 @@ EOF;
      */
     public function getProxyCode(Definition $definition)
     {
-        return preg_replace(
+        $code = $this->classGenerator->generate($this->generateProxyClass($definition));
+
+        $code = preg_replace(
             '/(\$this->initializer[0-9a-f]++) && \1->__invoke\(\$this->(valueHolder[0-9a-f]++), (.*?), \1\);/',
             '$1 && ($1->__invoke(\$$2, $3, $1) || 1) && $this->$2 = \$$2;',
-            $this->classGenerator->generate($this->generateProxyClass($definition))
+            $code
         );
+
+        if (version_compare(self::getProxyManagerVersion(), '2.2', '<')) {
+            $code = preg_replace(
+                '/((?:\$(?:this|initializer|instance)->)?(?:publicProperties|initializer|valueHolder))[0-9a-f]++/',
+                '${1}'.$this->getIdentifierSuffix($definition),
+                $code
+            );
+        }
+
+        return $code;
+    }
+
+    /**
+     * @return string
+     */
+    private static function getProxyManagerVersion()
+    {
+        if (!\class_exists(Version::class)) {
+            return '0.0.1';
+        }
+
+        return defined(Version::class.'::VERSION') ? Version::VERSION : Version::getVersion();
     }
 
     /**
@@ -108,7 +133,7 @@ EOF;
      */
     private function getProxyClassName(Definition $definition)
     {
-        return preg_replace('/^.*\\\\/', '', $definition->getClass()).'_'.substr(hash('sha256', $definition->getClass().$this->salt), -7);
+        return preg_replace('/^.*\\\\/', '', $definition->getClass()).'_'.$this->getIdentifierSuffix($definition);
     }
 
     /**
@@ -122,4 +147,12 @@ EOF;
 
         return $generatedClass;
     }
+
+    /**
+     * @return string
+     */
+    private function getIdentifierSuffix(Definition $definition)
+    {
+        return substr(hash('sha256', $definition->getClass().$this->salt), -7);
+    }
 }

src/Symfony/Bridge/ProxyManager/Tests/LazyProxy/PhpDumper/ProxyDumperTest.php

@@ -61,6 +61,14 @@ class ProxyDumperTest extends TestCase
         );
     }
 
+    public function testDeterministicProxyCode()
+    {
+        $definition = new Definition(__CLASS__);
+        $definition->setLazy(true);
+
+        $this->assertSame($this->dumper->getProxyCode($definition), $this->dumper->getProxyCode($definition));
+    }
+
     public function testGetProxyFactoryCode()
     {
         $definition = new Definition(__CLASS__);