fix(openapi): optional yaml component (#6445)

Author: soyuka

src/OpenApi/Command/OpenApiCommand.php

@@ -56,6 +56,13 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         $data = $this->normalizer->normalize($this->openApiFactory->__invoke(), 'json', [
             'spec_version' => $input->getOption('spec-version'),
         ]);
+
+        if ($input->getOption('yaml') && !class_exists(Yaml::class)) {
+            $output->writeln('The "symfony/yaml" component is not installed.');
+
+            return 1;
+        }
+
         $content = $input->getOption('yaml')
             ? Yaml::dump($data, 10, 2, Yaml::DUMP_OBJECT_AS_MAP | Yaml::DUMP_EMPTY_ARRAY_AS_SEQUENCE | Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK | Yaml::DUMP_NUMERIC_KEY_AS_STRING)
             : (json_encode($data, \JSON_PRETTY_PRINT | \JSON_UNESCAPED_SLASHES) ?: '');

src/Symfony/Bundle/DependencyInjection/ApiPlatformExtension.php

@@ -529,6 +529,11 @@ private function registerSwaggerConfiguration(ContainerBuilder $container, array
         }
 
         $loader->load('openapi.xml');
+
+        if (class_exists(Yaml::class)) {
+            $loader->load('openapi/yaml.xml');
+        }
+
         $loader->load('swagger_ui.xml');
 
         if ($config['event_listeners_backward_compatibility_layer']) {

src/Symfony/Bundle/Resources/config/openapi.xml

@@ -100,12 +100,6 @@
             <tag name="serializer.encoder" />
         </service>
 
-        <service id="api_platform.yamlopenapi.encoder" class="ApiPlatform\Serializer\YamlEncoder" public="false">
-            <argument>yamlopenapi</argument>
-            <argument type="service" id="serializer.encoder.yaml" on-invalid="null" />
-
-            <tag name="serializer.encoder" />
-        </service>
     </services>
 
 </container>

src/Symfony/Bundle/Resources/config/openapi/yaml.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" ?>
+
+<container xmlns="http://symfony.com/schema/dic/services"
+           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+           xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">
+    <services>
+        <service id="api_platform.yamlopenapi.encoder" class="ApiPlatform\Serializer\YamlEncoder" public="false">
+            <argument>yamlopenapi</argument>
+            <argument type="service" id="serializer.encoder.yaml" on-invalid="null" />
+
+            <tag name="serializer.encoder" />
+        </service>
+    </services>
+</container>