From dc658751a040ed2ad66bfb8d1c05532f61d6926d Mon Sep 17 00:00:00 2001
From: Mikhael Sokolov <mikhael.sokolov@mynd.co>
Date: Tue, 15 Aug 2023 18:44:04 +0400
Subject: [PATCH] Treat kotlin's `kotlin.Deprecated` as a deprecated operation

---
 .../swagger/v3/core/util/KotlinDetector.java  | 29 +++++++++++++++++++
 .../java/io/swagger/v3/jaxrs2/Reader.java     |  7 +++--
 2 files changed, 34 insertions(+), 2 deletions(-)
 create mode 100644 modules/swagger-core/src/main/java/io/swagger/v3/core/util/KotlinDetector.java

diff --git a/modules/swagger-core/src/main/java/io/swagger/v3/core/util/KotlinDetector.java b/modules/swagger-core/src/main/java/io/swagger/v3/core/util/KotlinDetector.java
new file mode 100644
index 0000000000..a861fd89d7
--- /dev/null
+++ b/modules/swagger-core/src/main/java/io/swagger/v3/core/util/KotlinDetector.java
@@ -0,0 +1,29 @@
+package io.swagger.v3.core.util;
+
+import java.lang.annotation.Annotation;
+
+public class KotlinDetector {
+    private static final Boolean kotlinAvailable;
+    private static final Class<? extends Annotation> kotlinDeprecated;
+
+    static {
+        kotlinAvailable = loadByClassOrNull("kotlin.Metadata") != null;
+        kotlinDeprecated = loadByClassOrNull("kotlin.Deprecated");
+    }
+
+    private static <T> Class<T> loadByClassOrNull(String className) {
+        try {
+            return (Class<T>) ReflectionUtils.loadClassByName(className);
+        } catch (ClassNotFoundException ex) {
+            return null;
+        }
+    }
+
+    public static boolean isKotlinPresent() {
+        return kotlinAvailable;
+    }
+
+    public static Class<? extends Annotation> getKotlinDeprecated() {
+        return kotlinDeprecated;
+    }
+}
diff --git a/modules/swagger-jaxrs2/src/main/java/io/swagger/v3/jaxrs2/Reader.java b/modules/swagger-jaxrs2/src/main/java/io/swagger/v3/jaxrs2/Reader.java
index 6b92eb7c2b..e7396b9f46 100644
--- a/modules/swagger-jaxrs2/src/main/java/io/swagger/v3/jaxrs2/Reader.java
+++ b/modules/swagger-jaxrs2/src/main/java/io/swagger/v3/jaxrs2/Reader.java
@@ -12,6 +12,7 @@
 import io.swagger.v3.core.util.AnnotationsUtils;
 import io.swagger.v3.core.util.Json;
 import io.swagger.v3.core.util.Json31;
+import io.swagger.v3.core.util.KotlinDetector;
 import io.swagger.v3.core.util.ParameterProcessor;
 import io.swagger.v3.core.util.PathUtils;
 import io.swagger.v3.core.util.ReflectionUtils;
@@ -305,7 +306,8 @@ public OpenAPI read(Class<?> cls,
         javax.ws.rs.Consumes classConsumes = ReflectionUtils.getAnnotation(cls, javax.ws.rs.Consumes.class);
         javax.ws.rs.Produces classProduces = ReflectionUtils.getAnnotation(cls, javax.ws.rs.Produces.class);
 
-        boolean classDeprecated = ReflectionUtils.getAnnotation(cls, Deprecated.class) != null;
+        boolean classDeprecated = ReflectionUtils.getAnnotation(cls, Deprecated.class) != null
+                || (KotlinDetector.isKotlinPresent() && ReflectionUtils.getAnnotation(cls, KotlinDetector.getKotlinDeprecated()) != null);
 
         // OpenApiDefinition
         OpenAPIDefinition openAPIDefinition = ReflectionUtils.getAnnotation(cls, OpenAPIDefinition.class);
@@ -434,7 +436,8 @@ public OpenAPI read(Class<?> cls,
                 continue;
             }
 
-            boolean methodDeprecated = ReflectionUtils.getAnnotation(method, Deprecated.class) != null;
+            boolean methodDeprecated = ReflectionUtils.getAnnotation(method, Deprecated.class) != null
+                    || (KotlinDetector.isKotlinPresent() && ReflectionUtils.getAnnotation(method, KotlinDetector.getKotlinDeprecated()) != null);
 
             javax.ws.rs.Path methodPath = ReflectionUtils.getAnnotation(method, javax.ws.rs.Path.class);