UniqueIdResource.java

/* Copyright 2014 Danish Maritime Authority.
 *
 *  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 net.maritimecloud.portal.resource;

import java.util.UUID;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.DefaultValue;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;

/**
 * Simpleminded service that clients may use to generate unique id's. NOT REST compliant in the sense that get is NOT idempotent!!!
 * <p>
 * @author Christoffer Børrild
 */
@Path("/api")
public class UniqueIdResource {

    @GET
    @Produces(MediaType.APPLICATION_JSON)
    @Path("uuid")
    public String generateUUID(@Context HttpServletResponse response, @QueryParam("name") @DefaultValue("uuid") String uuidName) {

        response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // HTTP 1.1.
        response.setHeader("Pragma", "no-cache"); // HTTP 1.0.
        response.setDateHeader("Expires", 0); // Proxies.

        return "{\"" + uuidName + "\":\"" + UUID.randomUUID().toString() + "\"}";
    }
}