Support for Authorization Generic Filters

These will aid applications using there own authorization
system at their desired granularity.

Change-Id: Iba7fca8742127bcec177b93452f111d28c7f8ec7
Signed-off-by: Jorge Hernandez <jh1730@att.com>
Issue-ID: POLICY-1043

1 files changed, 67 insertions, 0 deletions

diff --git a/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/http/server/AuthorizationFilter.java b/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/http/server/AuthorizationFilter.java
new file mode 100644
index 00000000..8ddf305f
--- /dev/null
+++ b/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/http/server/AuthorizationFilter.java
@@ -0,0 +1,67 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.endpoints.http.server;
+
+import java.io.IOException;
+import javax.servlet.Filter;
+import javax.servlet.FilterChain;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public abstract class AuthorizationFilter implements Filter {
+
+    private static Logger logger = LoggerFactory.getLogger(AuthorizationFilter.class);
+
+    @Override
+    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
+        throws IOException, ServletException {
+
+        if (!(servletRequest instanceof HttpServletRequest)) {
+            throw new ServletException("Not an HttpServletRequest instance");
+        }
+
+        if (!(servletResponse instanceof HttpServletResponse)) {
+            throw new ServletException("Not an HttpServletResponse instance");
+        }
+
+        HttpServletRequest request = (HttpServletRequest) servletRequest;
+        HttpServletResponse response = (HttpServletResponse) servletResponse;
+
+        String role = getRole(request);
+        boolean authorized = request.isUserInRole(role);
+
+        logger.info("user {} in role {}  is {}authorized to {}",
+            request.getUserPrincipal().getName(), role, ((authorized) ? "" : "NOT "), request.getMethod());
+
+        if (!authorized) {
+            response.setStatus(HttpServletResponse.SC_FORBIDDEN);
+        } else {
+            filterChain.doFilter(servletRequest, servletResponse);
+        }
+    }
+
+    protected abstract String getRole(HttpServletRequest request);
+}