AbstractSimpleSecurityManager.java

/*
 * RESTHeart - the Web API for MongoDB
 * Copyright (C) SoftInstigate Srl
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.restheart.security.impl;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;
import org.slf4j.LoggerFactory;
import org.yaml.snakeyaml.Yaml;

/**
 *
 * @author Maurizio Turatti {@literal <maurizio@softinstigate.com>}
 */
abstract class AbstractSimpleSecurityManager {

    private static final org.slf4j.Logger LOGGER = LoggerFactory.getLogger(AbstractSimpleSecurityManager.class);

    AbstractSimpleSecurityManager() {
    }

    abstract Consumer<? super Map<String, Object>> consumeConfiguration();

    @SuppressWarnings("unchecked")
    final void init(Map<String, Object> arguments, String type) throws FileNotFoundException {
        InputStream is = null;
        try {
            final String confFilePath = extractConfigFilePath(arguments);
            is = new FileInputStream(new File(confFilePath));
            final Map<String, Object> conf = (Map<String, Object>) new Yaml().load(is);
            List<Map<String, Object>> confItems = extractConfItems(conf, type);
            confItems.stream().forEach(consumeConfiguration());
        } catch(FileNotFoundException fnfe) {
            LOGGER.error("*** cannot find the file {} specified in the configuration.", extractConfigFilePath(arguments));
            LOGGER.error("*** note that the path must be either absolute or relative to the directory containing the RESTHeart jar file.");
            throw fnfe;
        } finally {
            try {
                if (is != null) {
                    is.close();
                }
            } catch (IOException ex) {
                LOGGER.warn("Can't close the InputStream", ex);
            }
        }
    }

    final String extractConfigFilePath(Map<String, Object> arguments) throws IllegalArgumentException {
        if (arguments == null) {
            throw new IllegalArgumentException("missing required arguments conf-file");
        }
        Object _confFilePath = arguments.getOrDefault("conf-file", "security.yml");
        if (_confFilePath == null || !(_confFilePath instanceof String)) {
            throw new IllegalArgumentException("missing required arguments conf-file");
        }
        String confFilePath = (String) _confFilePath;
        if (!confFilePath.startsWith("/")) {
            // this is to allow specifying the configuration file path relative to the jar (also working when running from classes)
            URL location = this.getClass().getProtectionDomain().getCodeSource().getLocation();
            File locationFile = new File(location.getPath());
            confFilePath = locationFile.getParent() + File.separator + confFilePath;
        }
        return confFilePath;
    }

    @SuppressWarnings("unchecked")
    final List<Map<String, Object>> extractConfItems(final Map<String, Object> conf, String type) throws IllegalArgumentException {
        Object _users = conf.get(type);
        if (_users == null || !(_users instanceof List)) {
            throw new IllegalArgumentException("wrong configuration file format. missing mandatory '" + type + "' section.");
        }
        List<Map<String, Object>> users = (List<Map<String, Object>>) _users;
        return users;
    }

}