| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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. |
| */ |
| package org.apache.sling.distribution.servlet; |
| |
| import javax.servlet.Filter; |
| import javax.servlet.FilterChain; |
| import javax.servlet.FilterConfig; |
| import javax.servlet.ServletException; |
| import javax.servlet.ServletRequest; |
| import javax.servlet.ServletResponse; |
| import javax.servlet.http.HttpServletResponse; |
| import java.io.IOException; |
| |
| import org.apache.felix.scr.annotations.Activate; |
| import org.apache.felix.scr.annotations.Component; |
| import org.apache.felix.scr.annotations.Properties; |
| import org.apache.felix.scr.annotations.Property; |
| import org.apache.felix.scr.annotations.Service; |
| import org.apache.sling.api.SlingHttpServletRequest; |
| import org.apache.sling.distribution.agent.spi.DistributionAgent; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.InvalidSyntaxException; |
| import org.osgi.framework.ServiceReference; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import static java.lang.String.format; |
| import static javax.servlet.http.HttpServletResponse.SC_CONFLICT; |
| |
| /** |
| * {@link Filter} to avoid creation of duplicate agents. |
| */ |
| @Component(immediate = true, metatype = false) |
| @Service(value = Filter.class) |
| @Properties({ |
| @Property(name = "service.description", value = "Duplicate replication agents IDs checking Filter"), |
| @Property(name = "service.vendor", value = "The Apache Software Foundation"), |
| @Property(name = "sling.filter.scope", value = "request"), |
| @Property(name = "sling.filter.pattern", value = "/libs/sling/distribution/settings/agents/.*"), |
| @Property(name = "osgi.http.whiteboard.filter.regex", value = "/libs/sling/distribution/settings/agents/.*"), |
| @Property(name = "service.ranking", intValue = Integer.MAX_VALUE) |
| }) |
| public final class DistributionAgentCreationFilter implements Filter { |
| |
| private static final String METHOD_POST = "POST"; |
| |
| private static final String NAME = "name"; |
| |
| private static final String TYPE = "type"; |
| |
| private static final String FACTORY_FILTER_PATTERN = "(&(name=%s)(!(type=%s)))"; |
| |
| private BundleContext context; |
| |
| private final Logger log = LoggerFactory.getLogger(getClass()); |
| |
| @Activate |
| protected void activate(BundleContext context) { |
| this.context = context; |
| } |
| |
| @Override |
| public void init(FilterConfig filterConfig) throws ServletException { |
| // do nothing |
| } |
| |
| @Override |
| public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { |
| SlingHttpServletRequest servletRequest = (SlingHttpServletRequest) request; |
| |
| // only intercept POST requests |
| if (METHOD_POST.equalsIgnoreCase(servletRequest.getMethod())) { |
| String name = request.getParameter(NAME); |
| String type = request.getParameter(TYPE); |
| |
| if (type != null && name != null) { |
| String filter = format(FACTORY_FILTER_PATTERN, name, type); |
| try { |
| ServiceReference[] services = context.getAllServiceReferences(DistributionAgent.class.getName(), filter); |
| if (services != null && services.length > 0) { |
| String errorMessage = format("An agent named '%s' of different type than '%s' was already previously registered, please change the Agent name.", |
| name, type); |
| ((HttpServletResponse) response).sendError(SC_CONFLICT, errorMessage); |
| return; |
| } |
| } catch (InvalidSyntaxException e) { |
| // should not happen... |
| log.error("Impossible to access to {} references", DistributionAgent.class.getName(), e); |
| } |
| } |
| } |
| |
| chain.doFilter(request, response); |
| } |
| |
| @Override |
| public void destroy() { |
| // do nothing |
| } |
| |
| } |