Initial sources

src/main/java/com/devsoap/keycloak/WebjarThemeResourceProviderFactory.java

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+/**
+ * Copyright (C) 2025 John Ahlroos
+ *
+ * Licensed 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.
+ */
+package com.devsoap.keycloak;
+
+import java.io.IOException;
+import java.io.InputStream;
+import org.jboss.logging.Logger;
+import org.keycloak.Config.Scope;
+import org.keycloak.theme.ClasspathThemeResourceProviderFactory;
+
+/**
+ * Provider that provides access to webjar static resource for Keycloak themes
+ *
+ * @author John Ahlroos / devsoap.com
+ * @version Unversioned
+ *
+ * <p>
+ * How to use:
+ *  <ul>
+ *      <li>Download the Webjar from the internet and place the JAR in the Keycloak <code>/opt/keycloak/providers</code> folder</li>
+ *      <li>Easiest way to download is to use Gradle/Maven (See build.gradle composeProviders task in this project)</li>
+ *      <li>
+ *          In your Keycloak theme add a reference to the css and script files you want to include:
+ *          <pre>
+ *  //theme.properties
+ *  styles=webjars/uikit/3.17.9/css/uikit.min.css
+ *  scripts=webjars/htmx.org/1.9.2/dist/htmx.min.js
+ *          </pre>
+ *      </li>
+ *  </ul>
+ * </p>
+ */
+public class WebjarThemeResourceProviderFactory extends ClasspathThemeResourceProviderFactory {
+
+    private final Logger LOGGER = Logger.getLogger(WebjarThemeResourceProviderFactory.class);
+
+    public WebjarThemeResourceProviderFactory() {
+        super("webjar", Thread.currentThread().getContextClassLoader());
+    }
+
+    @Override
+    public void init(Scope config) {
+        super.init(config);
+        try {
+            var webjars = classLoader.getResources("META-INF/resources/webjars/");
+            while (webjars.hasMoreElements()) {
+                LOGGER.debugf("Webjar: %s", webjars.nextElement());
+            }
+        } catch (IOException e) {
+           LOGGER.warn("Failed to resolve webjars", e);
+        }
+    }
+
+    @Override
+    public InputStream getResourceAsStream(String path) {
+        if (path != null && path.startsWith("webjars")) {
+            return classLoader.getResourceAsStream("META-INF/resources/" + path);
+        }
+        return null;
+    }
+}

src/main/resources/META-INF/services/org.keycloak.theme.ClasspathThemeResourceProviderFactory

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+com.devsoap.keycloak.WebjarThemeResourceProviderFactory