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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * 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
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog2.security;

import com.google.common.collect.Lists;
import com.mongodb.BasicDBObject;
import com.mongodb.DBObject;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.Indexes;
import org.apache.shiro.session.mgt.SimpleSession;
import org.bson.Document;
import org.bson.types.ObjectId;
import org.graylog2.database.MongoConnection;
import org.graylog2.database.PersistedServiceImpl;
import org.graylog2.events.ClusterEventBus;
import org.graylog2.plugin.database.Persisted;

import javax.annotation.Nullable;
import javax.inject.Inject;
import javax.inject.Singleton;
import java.util.Collection;
import java.util.List;

@Singleton
public class MongoDBSessionServiceImpl extends PersistedServiceImpl implements MongoDBSessionService {
    private final ClusterEventBus eventBus;

    @Inject
    public MongoDBSessionServiceImpl(MongoConnection mongoConnection, ClusterEventBus clusterEventBus) {
        super(mongoConnection);
        this.eventBus = clusterEventBus;

        final MongoDatabase database = mongoConnection.getMongoDatabase();
        final MongoCollection sessions = database.getCollection(MongoDbSession.COLLECTION_NAME);
        sessions.createIndex(Indexes.ascending(MongoDbSession.FIELD_SESSION_ID));
    }

    @Override
    @Nullable
    public MongoDbSession load(String sessionId) {
        DBObject query = new BasicDBObject();
        query.put(MongoDbSession.FIELD_SESSION_ID, sessionId);

        DBObject result = findOne(MongoDbSession.class, query);
        if (result == null) {
            return null;
        }
        final Object objectId = result.get("_id");
        return new MongoDbSession((ObjectId) objectId, result.toMap());
    }

    @Override
    public Collection loadAll() {
        DBObject query = new BasicDBObject();
        List dbSessions = Lists.newArrayList();
        final List sessions = query(MongoDbSession.class, query);
        for (DBObject session : sessions) {
            dbSessions.add(new MongoDbSession((ObjectId) session.get("_id"), session.toMap()));
        }

        return dbSessions;
    }

    @Override
    public SimpleSession daoToSimpleSession(MongoDbSession sessionDAO) {
        final SimpleSession session = new SimpleSession();
        session.setId(sessionDAO.getSessionId());
        session.setHost(sessionDAO.getHost());
        session.setTimeout(sessionDAO.getTimeout());
        session.setStartTimestamp(sessionDAO.getStartTimestamp());
        session.setLastAccessTime(sessionDAO.getLastAccessTime());
        session.setExpired(sessionDAO.isExpired());
        session.setAttributes(sessionDAO.getAttributes());
        return session;
    }

    @Override
    public  int destroy(T model) {
        int affectedDocs = super.destroy(model);
        if (affectedDocs != 0 && model instanceof MongoDbSession session) {
            eventBus.post(new SessionDeletedEvent(session.getSessionId()));
        }
        return affectedDocs;
    }
}