Merge pull request #3841 from mposolda/KEYCLOAK-4385

KEYCLOAK-4385 Added BundleBasedKeycloakConfigResolver

adapters/oidc/osgi-adapter/src/main/java/org/keycloak/adapters/osgi/BundleBasedKeycloakConfigResolver.java

@@ -0,0 +1,83 @@
+/*
+ * Copyright 2016 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * 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 org.keycloak.adapters.osgi;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+
+import org.keycloak.adapters.KeycloakConfigResolver;
+import org.keycloak.adapters.KeycloakDeployment;
+import org.keycloak.adapters.KeycloakDeploymentBuilder;
+import org.keycloak.adapters.spi.HttpFacade;
+import org.osgi.framework.BundleContext;
+
+/**
+ * @author <a href="mailto:mposolda@redhat.com">Marek Posolda</a>
+ */
+public class BundleBasedKeycloakConfigResolver implements KeycloakConfigResolver {
+
+    private volatile KeycloakDeployment cachedDeployment;
+
+    private BundleContext bundleContext;
+    private String configLocation = "WEB-INF/keycloak.json";
+
+    public BundleContext getBundleContext() {
+        return bundleContext;
+    }
+
+    public void setBundleContext(BundleContext bundleContext) {
+        this.bundleContext = bundleContext;
+    }
+
+    public String getConfigLocation() {
+        return configLocation;
+    }
+
+    public void setConfigLocation(String configLocation) {
+        this.configLocation = configLocation;
+    }
+
+    @Override
+    public KeycloakDeployment resolve(HttpFacade.Request request) {
+        if (cachedDeployment != null) {
+            return cachedDeployment;
+        } else {
+            cachedDeployment = findDeployment(request);
+            return cachedDeployment;
+        }
+    }
+
+    protected KeycloakDeployment findDeployment(HttpFacade.Request request) {
+        if (bundleContext == null) {
+            throw new IllegalStateException("bundleContext must be set for BundleBasedKeycloakConfigResolver!");
+        }
+
+        URL url = bundleContext.getBundle().getResource(configLocation);
+        if (url == null) {
+            throw new IllegalStateException("Failed to find the file " + configLocation + " on classpath.");
+        }
+
+        try {
+            InputStream is = url.openStream();
+            return KeycloakDeploymentBuilder.build(is);
+        } catch (IOException ioe) {
+            throw new IllegalStateException("Error reading file' " + configLocation + "' from bundle classpath.", ioe);
+        }
+    }
+}