co.cask.cdap.gateway.handlers.ConsoleSettingsHttpHandler.java Source code

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Here is the source code for co.cask.cdap.gateway.handlers.ConsoleSettingsHttpHandler.java

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/*
 * Copyright  2015-2016 Cask Data, Inc.
 *
 * 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 co.cask.cdap.gateway.handlers;

import co.cask.cdap.common.conf.Constants;
import co.cask.cdap.config.Config;
import co.cask.cdap.config.ConfigNotFoundException;
import co.cask.cdap.config.ConsoleSettingsStore;
import co.cask.cdap.security.spi.authentication.SecurityRequestContext;
import co.cask.http.AbstractHttpHandler;
import co.cask.http.HttpResponder;
import com.google.common.base.Charsets;
import com.google.common.base.Objects;
import com.google.common.collect.ImmutableMap;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.JsonSyntaxException;
import com.google.inject.Inject;
import org.jboss.netty.handler.codec.http.HttpRequest;
import org.jboss.netty.handler.codec.http.HttpResponseStatus;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Map;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;

/**
 * Console Settings HTTP Handler.
 */
@Path(Constants.Gateway.API_VERSION_3 + "/configuration/user")
public class ConsoleSettingsHttpHandler extends AbstractHttpHandler {
    private static final Logger LOG = LoggerFactory.getLogger(ConsoleSettingsHttpHandler.class);
    private static final JsonParser JSON_PARSER = new JsonParser();

    private static final String CONFIG_PROPERTY = "property";
    private static final String ID = "id";

    private final ConsoleSettingsStore store;

    @Inject
    public ConsoleSettingsHttpHandler(ConsoleSettingsStore store) {
        this.store = store;
    }

    @Path("/")
    @GET
    public void get(HttpRequest request, HttpResponder responder) throws Exception {
        String userId = Objects.firstNonNull(SecurityRequestContext.getUserId(), "");
        Config userConfig;
        try {
            userConfig = store.get(userId);
        } catch (ConfigNotFoundException e) {
            Map<String, String> propMap = ImmutableMap.of(CONFIG_PROPERTY, "{}");
            userConfig = new Config(userId, propMap);
        }

        JsonObject jsonObject = new JsonObject();
        jsonObject.addProperty(ID, userConfig.getId());

        //We store the serialized JSON string of the properties in ConfigStore and we return a JsonObject back
        jsonObject.add(CONFIG_PROPERTY, JSON_PARSER.parse(userConfig.getProperties().get(CONFIG_PROPERTY)));
        responder.sendJson(HttpResponseStatus.OK, jsonObject);
    }

    @Path("/")
    @DELETE
    public void delete(HttpRequest request, HttpResponder responder) throws Exception {
        String userId = Objects.firstNonNull(SecurityRequestContext.getUserId(), "");
        try {
            store.delete(userId);
        } catch (ConfigNotFoundException e) {
            // no-op if configuration does not exist - possible if nothing was 'put'
        }
        responder.sendStatus(HttpResponseStatus.OK);
    }

    @Path("/")
    @PUT
    public void set(HttpRequest request, HttpResponder responder) throws Exception {
        String data = request.getContent().toString(Charsets.UTF_8);
        if (!isValidJSON(data)) {
            responder.sendJson(HttpResponseStatus.BAD_REQUEST, "Invalid JSON in body");
            return;
        }

        //Configuration Layout for UserSettings:
        //Config ID : userId
        //Config Properties : Map (Key = CONFIG_PROPERTY, Value = Serialized JSON string of properties)
        //User Settings configurations are stored under empty NAMESPACE.
        Map<String, String> propMap = ImmutableMap.of(CONFIG_PROPERTY, data);
        String userId = Objects.firstNonNull(SecurityRequestContext.getUserId(), "");
        Config userConfig = new Config(userId, propMap);
        store.put(userConfig);
        responder.sendStatus(HttpResponseStatus.OK);
    }

    private boolean isValidJSON(String json) {
        try {
            JSON_PARSER.parse(json);
        } catch (JsonSyntaxException ex) {
            return false;
        }
        return true;
    }
}