Enforce license headers

Signed-off-by: Thomas Farr <tsfarr@amazon.com>

LICENSE_HEADER.txt

@@ -0,0 +1,8 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+

LICENSE_HEADER_FORKED.txt

@@ -0,0 +1,32 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+/*
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+

java-client/build.gradle.kts

@@ -296,19 +296,28 @@ tasks.withType<Jar> {
 }
 
 spotless {
-  java {
+    java {
+        target("**/*.java")
 
-    target("**/*.java")
+        licenseHeaderFile("../LICENSE_HEADER.txt")
+            .named("PrimaryLicenseHeader")
+            .onlyIfContentMatches("^((?!Licensed to Elasticsearch)[\\s\\S])*$")
+            .delimiter("(package |//-----)")
 
-    // Use the default importOrder configuration
-    importOrder()
-    removeUnusedImports()
+        licenseHeaderFile("../LICENSE_HEADER_FORKED.txt")
+            .named("ForkedLicenseHeader")
+            .onlyIfContentMatches("Licensed to Elasticsearch")
+            .delimiter("(package |//-----)")
 
-    eclipse().configFile("../buildSrc/formatterConfig.xml")
+        // Use the default importOrder configuration
+        importOrder()
+        removeUnusedImports()
 
-    trimTrailingWhitespace()
-    endWithNewline()
-  }
+        eclipse().configFile("../buildSrc/formatterConfig.xml")
+
+        trimTrailingWhitespace()
+        endWithNewline()
+    }
 }
 
 publishing {

java-codegen/build.gradle.kts

@@ -251,6 +251,8 @@ spotless {
     java {
         target("**/*.java")
 
+        licenseHeaderFile("../LICENSE_HEADER.txt")
+
         // Use the default importOrder configuration
         importOrder()
         removeUnusedImports()