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User Managed Access (UMA) extension of the MITREid Connect server
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/*******************************************************************************
 * Copyright 2015 The MITRE Corporation
 *   and the MIT Kerberos and Internet Trust Consortium
 *
 * 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.mitre.uma.view;

import java.io.IOException;
import java.io.Writer;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.mitre.openid.connect.config.ConfigurationPropertiesBean;
import org.mitre.openid.connect.view.JsonEntityView;
import org.mitre.uma.model.ResourceSet;
import org.mitre.util.JsonUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;
import org.springframework.validation.BeanPropertyBindingResult;
import org.springframework.web.servlet.view.AbstractView;

import com.google.common.base.Strings;
import com.google.gson.ExclusionStrategy;
import com.google.gson.FieldAttributes;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonObject;
import com.google.gson.LongSerializationPolicy;

@Component(ResourceSetEntityView.VIEWNAME)
public class ResourceSetEntityView extends AbstractView {
	private static Logger logger = LoggerFactory.getLogger(JsonEntityView.class);

	public static final String VIEWNAME = "resourceSetEntityView";

	@Autowired
	private ConfigurationPropertiesBean config;

	private Gson gson = new GsonBuilder()
	.setExclusionStrategies(new ExclusionStrategy() {

		@Override
		public boolean shouldSkipField(FieldAttributes f) {

			return false;
		}

		@Override
		public boolean shouldSkipClass(Class clazz) {
			// skip the JPA binding wrapper
			if (clazz.equals(BeanPropertyBindingResult.class)) {
				return true;
			}
			return false;
		}

	})
	.serializeNulls()
	.setDateFormat("yyyy-MM-dd'T'HH:mm:ssZ")
	.setLongSerializationPolicy(LongSerializationPolicy.STRING)
	.create();

	@Override
	protected void renderMergedOutputModel(Map model, HttpServletRequest request, HttpServletResponse response) {

		response.setContentType("application/json");


		HttpStatus code = (HttpStatus) model.get("code");
		if (code == null) {
			code = HttpStatus.OK; // default to 200
		}

		response.setStatus(code.value());

		String location = (String) model.get("location");
		if (!Strings.isNullOrEmpty(location)) {
			response.setHeader(HttpHeaders.LOCATION, location);
		}

		try {

			Writer out = response.getWriter();
			ResourceSet rs = (ResourceSet) model.get("entity");

			JsonObject o = new JsonObject();

			o.addProperty("_id", rs.getId().toString()); // send the id as a string
			o.addProperty("user_access_policy_uri", config.getIssuer() + "manage/resource/" + rs.getId());
			o.addProperty("name", rs.getName());
			o.addProperty("uri", rs.getUri());
			o.addProperty("type", rs.getType());
			o.add("scopes", JsonUtils.getAsArray(rs.getScopes()));
			o.addProperty("icon_uri", rs.getIconUri());

			gson.toJson(o, out);

		} catch (IOException e) {

			logger.error("IOException in ResourceSetEntityView.java: ", e);

		}
	}

}