[DI] Unknown env prefix not regornized as such

Author: ro0NL

EnvVarProcessor.php

@@ -126,9 +126,7 @@ public function getEnv($prefix, $name, \Closure $getEnv)
         }
 
         if (false !== $i || 'string' !== $prefix) {
-            if (null === $env = $getEnv($name)) {
-                return null;
-            }
+            $env = $getEnv($name);
         } elseif (isset($_ENV[$name])) {
             $env = $_ENV[$name];
         } elseif (isset($_SERVER[$name]) && 0 !== strpos($name, 'HTTP_')) {
@@ -173,10 +171,16 @@ public function getEnv($prefix, $name, \Closure $getEnv)
                     throw new EnvNotFoundException(sprintf('Environment variable not found: "%s".', $name));
                 }
 
-                if (null === $env = $this->container->getParameter("env($name)")) {
-                    return null;
-                }
+                $env = $this->container->getParameter("env($name)");
+            }
+        }
+
+        if (null === $env) {
+            if (!isset($this->getProvidedTypes()[$prefix])) {
+                throw new RuntimeException(sprintf('Unsupported env var prefix "%s".', $prefix));
             }
+
+            return null;
         }
 
         if (!is_scalar($env)) {

Tests/EnvVarProcessorTest.php

@@ -9,6 +9,7 @@
 use Symfony\Component\DependencyInjection\EnvVarLoaderInterface;
 use Symfony\Component\DependencyInjection\EnvVarProcessor;
 use Symfony\Component\DependencyInjection\Exception\ParameterCircularReferenceException;
+use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 
 class EnvVarProcessorTest extends TestCase
 {
@@ -595,4 +596,17 @@ public function loadEnvVars(): array
 
         $this->assertSame(2, $index);
     }
+
+    public function testGetEnvInvalidPrefixWithDefault()
+    {
+        $this->expectException(RuntimeException::class);
+        $this->expectExceptionMessage('Unsupported env var prefix');
+        $processor = new EnvVarProcessor(new Container());
+
+        $processor->getEnv('unknown', 'default::FAKE', function ($name) {
+            $this->assertSame('default::FAKE', $name);
+
+            return null;
+        });
+    }
 }