JsonFileRegisteredClientService.java

/*******************************************************************************
 * Copyright 2018 The MIT Internet Trust Consortium
 *
 * Portions copyright 2011-2013 The MITRE Corporation
 *
 * 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.openid.connect.client.service.impl;

import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.Map;

import org.mitre.oauth2.model.RegisteredClient;
import org.mitre.openid.connect.ClientDetailsEntityJsonProcessor;
import org.mitre.openid.connect.client.service.RegisteredClientService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.reflect.TypeToken;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

/**
 * @author jricher
 *
 */
public class JsonFileRegisteredClientService implements RegisteredClientService {

	/**
	 * Logger for this class
	 */
	private static final Logger logger = LoggerFactory.getLogger(JsonFileRegisteredClientService.class);

	private Gson gson = new GsonBuilder()
			.registerTypeAdapter(RegisteredClient.class, new JsonSerializer<RegisteredClient>() {
				@Override
				public JsonElement serialize(RegisteredClient src, Type typeOfSrc, JsonSerializationContext context) {
					return ClientDetailsEntityJsonProcessor.serialize(src);
				}
			})
			.registerTypeAdapter(RegisteredClient.class, new JsonDeserializer<RegisteredClient>() {
				@Override
				public RegisteredClient deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
					return ClientDetailsEntityJsonProcessor.parseRegistered(json);
				}
			})
			.setPrettyPrinting()
			.create();

	private File file;

	private Map<String, RegisteredClient> clients = new HashMap<>();

	public JsonFileRegisteredClientService(String filename) {
		this.file = new File(filename);
		load();
	}

	/* (non-Javadoc)
	 * @see org.mitre.openid.connect.client.service.RegisteredClientService#getByIssuer(java.lang.String)
	 */
	@Override
	public RegisteredClient getByIssuer(String issuer) {
		return clients.get(issuer);
	}

	/* (non-Javadoc)
	 * @see org.mitre.openid.connect.client.service.RegisteredClientService#save(java.lang.String, org.mitre.oauth2.model.RegisteredClient)
	 */
	@Override
	public void save(String issuer, RegisteredClient client) {
		clients.put(issuer, client);
		write();
	}

	/**
	 * Sync the map of clients out to disk.
	 */
	@SuppressWarnings("serial")
	private void write() {
		try {
			if (!file.exists()) {
				// create a new file
				logger.info("Creating saved clients list in " + file);
				file.createNewFile();
			}
			FileWriter out = new FileWriter(file);

			gson.toJson(clients, new TypeToken<Map<String, RegisteredClient>>(){}.getType(), out);

			out.close();

		} catch (IOException e) {
			logger.error("Could not write to output file", e);
		}
	}

	/**
	 * Load the map in from disk.
	 */
	@SuppressWarnings("serial")
	private void load() {
		try {
			if (!file.exists()) {
				logger.info("No sved clients file found in " + file);
				return;
			}
			FileReader in = new FileReader(file);

			clients = gson.fromJson(in, new TypeToken<Map<String, RegisteredClient>>(){}.getType());

			in.close();

		} catch (IOException e) {
			logger.error("Could not read from input file", e);
		}
	}

}