Added option to save the generated OpenAPI schema document on build.

extensions/smallrye-openapi-common/deployment/src/main/java/io/quarkus/smallrye/openapi/common/deployment/SmallRyeOpenApiConfig.java

@@ -1,5 +1,8 @@
 package io.quarkus.smallrye.openapi.common.deployment;
 
+import java.nio.file.Path;
+import java.util.Optional;
+
 import io.quarkus.runtime.annotations.ConfigItem;
 import io.quarkus.runtime.annotations.ConfigRoot;
 
@@ -10,4 +13,11 @@ public final class SmallRyeOpenApiConfig {
      */
     @ConfigItem(defaultValue = "/openapi")
     public String path;
+
+    /**
+     * If set, the generated OpenAPI schema documents will be stored here on build.
+     * Both openapi.json and openapi.yaml will be stored here if this is set.
+     */
+    @ConfigItem
+    public Optional<Path> storeSchemaDirectory;
 }

extensions/smallrye-openapi/deployment/src/main/java/io/quarkus/smallrye/openapi/deployment/SmallRyeOpenApiProcessor.java

@@ -5,6 +5,8 @@
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardOpenOption;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -29,6 +31,7 @@
 import org.jboss.jandex.DotName;
 import org.jboss.jandex.IndexView;
 import org.jboss.jandex.Type;
+import org.jboss.logging.Logger;
 
 import io.quarkus.arc.deployment.AdditionalBeanBuildItem;
 import io.quarkus.arc.deployment.BeanArchiveIndexBuildItem;
@@ -81,6 +84,8 @@
  */
 public class SmallRyeOpenApiProcessor {
 
+    private static final Logger log = Logger.getLogger("io.quarkus.smallrye.openapi");
+
     private static final String META_INF_OPENAPI_YAML = "META-INF/openapi.yaml";
     private static final String WEB_INF_CLASSES_META_INF_OPENAPI_YAML = "WEB-INF/classes/META-INF/openapi.yaml";
     private static final String META_INF_OPENAPI_YML = "META-INF/openapi.yml";
@@ -103,7 +108,7 @@ public class SmallRyeOpenApiProcessor {
     private static final String SPRING = "Spring";
     private static final String VERT_X = "Vert.x";
 
-    SmallRyeOpenApiConfig openapi;
+    SmallRyeOpenApiConfig openApiConfig;
 
     @BuildStep
     void contributeClassesToIndex(BuildProducer<AdditionalIndexedClassesBuildItem> additionalIndexedClasses) {
@@ -143,9 +148,9 @@ RouteBuildItem handler(LaunchModeBuildItem launch,
          */
         if (launch.getLaunchMode() == LaunchMode.DEVELOPMENT) {
             recorder.setupClDevMode(shutdownContext);
-            displayableEndpoints.produce(new NotFoundPageDisplayableEndpointBuildItem(openapi.path));
+            displayableEndpoints.produce(new NotFoundPageDisplayableEndpointBuildItem(openApiConfig.path));
         }
-        return new RouteBuildItem(openapi.path, new OpenApiHandler(), HandlerType.BLOCKING);
+        return new RouteBuildItem(openApiConfig.path, new OpenApiHandler(), HandlerType.BLOCKING);
     }
 
     @BuildStep
@@ -317,11 +322,16 @@ public void build(ApplicationArchivesBuildItem archivesBuildItem,
             annotationModel = null;
         }
         OpenApiDocument finalDocument = loadDocument(staticModel, annotationModel);
+        boolean shouldStore = openApiConfig.storeSchemaDirectory.isPresent();
         for (Format format : Format.values()) {
             String name = OpenApiHandler.BASE_NAME + format;
-            resourceBuildItemBuildProducer.produce(new GeneratedResourceBuildItem(name,
-                    OpenApiSerializer.serialize(finalDocument.get(), format).getBytes(StandardCharsets.UTF_8)));
+            byte[] schemaDocument = OpenApiSerializer.serialize(finalDocument.get(), format).getBytes(StandardCharsets.UTF_8);
+            resourceBuildItemBuildProducer.produce(new GeneratedResourceBuildItem(name, schemaDocument));
             nativeImageResources.produce(new NativeImageResourceBuildItem(name));
+
+            if (shouldStore) {
+                storeGeneratedSchema(schemaDocument, format);
+            }
         }
     }
 
@@ -331,6 +341,21 @@ LogCleanupFilterBuildItem logCleanup() {
                 "OpenAPI document initialized:");
     }
 
+    private void storeGeneratedSchema(byte[] schemaDocument, Format format) throws IOException {
+        Path directory = openApiConfig.storeSchemaDirectory.get();
+        if (!Files.exists(directory)) {
+            Files.createDirectories(directory);
+        }
+
+        Path file = Paths.get(directory.toString(), "openapi." + format.toString().toLowerCase());
+        if (!Files.exists(file)) {
+            Files.createFile(file);
+        }
+        Files.write(file, schemaDocument, StandardOpenOption.WRITE);
+
+        log.info("OpenAPI " + format.toString() + " saved: " + file.toString());
+    }
+
     private boolean shouldScanAnnotations(Capabilities capabilities, IndexView index) {
         // Disabled via config
         Config config = ConfigProvider.getConfig();

extensions/smallrye-openapi/deployment/src/test/java/io/quarkus/smallrye/openapi/test/jaxrs/OpenApiStoreSchemaTestCase.java

@@ -0,0 +1,36 @@
+package io.quarkus.smallrye.openapi.test.jaxrs;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+import org.jboss.shrinkwrap.api.ShrinkWrap;
+import org.jboss.shrinkwrap.api.asset.StringAsset;
+import org.jboss.shrinkwrap.api.spec.JavaArchive;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+import io.quarkus.test.QuarkusUnitTest;
+import io.smallrye.openapi.runtime.io.Format;
+
+public class OpenApiStoreSchemaTestCase {
+
+    private static String directory = "target/generated/jax-rs/";
+    private static final String OPEN_API_DOT = "openapi.";
+
+    @RegisterExtension
+    static QuarkusUnitTest runner = new QuarkusUnitTest()
+            .setArchiveProducer(() -> ShrinkWrap.create(JavaArchive.class)
+                    .addClasses(OpenApiResource.class, ResourceBean.class)
+                    .addAsResource(new StringAsset("quarkus.smallrye-openapi.store-schema-directory=" + directory),
+                            "application.properties"));
+
+    @Test
+    public void testOpenApiPathAccessResource() {
+        Path json = Paths.get(directory, OPEN_API_DOT + Format.JSON.toString().toLowerCase());
+        Assertions.assertTrue(Files.exists(json));
+        Path yaml = Paths.get(directory, OPEN_API_DOT + Format.YAML.toString().toLowerCase());
+        Assertions.assertTrue(Files.exists(yaml));
+    }
+}

extensions/smallrye-openapi/deployment/src/test/java/io/quarkus/smallrye/openapi/test/spring/OpenApiStoreSchemaTestCase.java

@@ -0,0 +1,36 @@
+package io.quarkus.smallrye.openapi.test.spring;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+import org.jboss.shrinkwrap.api.ShrinkWrap;
+import org.jboss.shrinkwrap.api.asset.StringAsset;
+import org.jboss.shrinkwrap.api.spec.JavaArchive;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+import io.quarkus.test.QuarkusUnitTest;
+import io.smallrye.openapi.runtime.io.Format;
+
+public class OpenApiStoreSchemaTestCase {
+
+    private static String directory = "target/generated/spring/";
+    private static final String OPEN_API_DOT = "openapi.";
+
+    @RegisterExtension
+    static QuarkusUnitTest runner = new QuarkusUnitTest()
+            .setArchiveProducer(() -> ShrinkWrap.create(JavaArchive.class)
+                    .addClasses(OpenApiController.class)
+                    .addAsResource(new StringAsset("quarkus.smallrye-openapi.store-schema-directory=" + directory),
+                            "application.properties"));
+
+    @Test
+    public void testOpenApiPathAccessResource() {
+        Path json = Paths.get(directory, OPEN_API_DOT + Format.JSON.toString().toLowerCase());
+        Assertions.assertTrue(Files.exists(json));
+        Path yaml = Paths.get(directory, OPEN_API_DOT + Format.YAML.toString().toLowerCase());
+        Assertions.assertTrue(Files.exists(yaml));
+    }
+}

extensions/smallrye-openapi/deployment/src/test/java/io/quarkus/smallrye/openapi/test/vertx/OpenApiStoreSchemaTestCase.java

@@ -0,0 +1,36 @@
+package io.quarkus.smallrye.openapi.test.vertx;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+import org.jboss.shrinkwrap.api.ShrinkWrap;
+import org.jboss.shrinkwrap.api.asset.StringAsset;
+import org.jboss.shrinkwrap.api.spec.JavaArchive;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+import io.quarkus.test.QuarkusUnitTest;
+import io.smallrye.openapi.runtime.io.Format;
+
+public class OpenApiStoreSchemaTestCase {
+
+    private static String directory = "target/generated/vertx/";
+    private static final String OPEN_API_DOT = "openapi.";
+
+    @RegisterExtension
+    static QuarkusUnitTest runner = new QuarkusUnitTest()
+            .setArchiveProducer(() -> ShrinkWrap.create(JavaArchive.class)
+                    .addClasses(OpenApiRoute.class)
+                    .addAsResource(new StringAsset("quarkus.smallrye-openapi.store-schema-directory=" + directory),
+                            "application.properties"));
+
+    @Test
+    public void testOpenApiPathAccessResource() {
+        Path json = Paths.get(directory, OPEN_API_DOT + Format.JSON.toString().toLowerCase());
+        Assertions.assertTrue(Files.exists(json));
+        Path yaml = Paths.get(directory, OPEN_API_DOT + Format.YAML.toString().toLowerCase());
+        Assertions.assertTrue(Files.exists(yaml));
+    }
+}