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// Portions Copyright [2016-2019] [Payara Foundation and/or its affiliates]

package org.glassfish.web.ha.authenticator;

import com.sun.enterprise.container.common.spi.util.JavaEEIOUtils;

import org.apache.catalina.Container;
import org.apache.catalina.core.StandardContext;
import org.apache.catalina.Session;
import org.apache.catalina.authenticator.SingleSignOn;
import org.apache.catalina.authenticator.SingleSignOnEntry;
import org.glassfish.web.ha.LogFacade;
import org.glassfish.web.ha.session.management.HAStoreBase;

import java.io.*;
import java.security.Principal;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * @author Shing Wai Chan
 */
public class HASingleSignOnEntry extends SingleSignOnEntry {
    private static final Logger logger = LogFacade.getLogger();

    protected long maxIdleTime;

    protected JavaEEIOUtils ioUtils;

    protected HASingleSignOnEntryMetadata metadata = null;

    // default constructor is required by backing store
    public HASingleSignOnEntry() {
        this(null, null, null, null, null, 0, 0, 0, null);
    }

    public HASingleSignOnEntry(Container container, HASingleSignOnEntryMetadata m,
            JavaEEIOUtils ioUtils) {
        this(m.getId(), null, m.getAuthType(),
                m.getUserName(), m.getRealmName(),
                m.getLastAccessTime(), m.getMaxIdleTime(), m.getVersion(),
                ioUtils);

        // GLASSFISH-21148: constructor called with null - don't forget to update metadata!
        this.principal = parsePrincipal(m);
        this.metadata.principalBytes = m.getPrincipalBytes() == null ? null : m.getPrincipalBytes().clone();

        for (HASessionData data: m.getHASessionDataSet()) {
            StandardContext context = (StandardContext)container.findChild(data.getContextPath());
            Session session = null;
            try {
                session = context.getManager().findSession(data.getSessionId());
            } catch(IOException ex) {
                throw new IllegalStateException("Cannot find the session: " + data.getSessionId(), ex);
            }
            if (session != null) {
              sessions.put(data.getSessionId(), session);
            }
        }
        logger.log(Level.FINER, "Loaded HA SSO entry from metadata. Principal: {}", this.principal);
    }

    // TODO: javadoc: difference between principal.getName and userName?
    public HASingleSignOnEntry(String id, Principal principal, String authType,
            String username, String realmName,
            long lastAccessTime, long maxIdleTime, long version,
            JavaEEIOUtils ioUtils) {

        super(id, version, principal, authType, username, realmName);
        this.lastAccessTime = lastAccessTime;
        this.maxIdleTime = maxIdleTime;
        this.ioUtils = ioUtils;

        this.metadata = new HASingleSignOnEntryMetadata(
                id, version, convertToByteArray(principal), authType,
                username, realmName,
                lastAccessTime, maxIdleTime);
        logger.log(Level.FINER, "Created HA SSO entry. Principal: {}", this.principal);
    }

    public HASingleSignOnEntryMetadata getMetadata() {
        return metadata;
    }

    public long getMaxIdleTime() {
        return maxIdleTime;
    }

    @Override
    public synchronized boolean addSession(SingleSignOn sso, Session session) {
        boolean result = super.addSession(sso, session);
        if (result) {
            metadata.addHASessionData(new HASessionData(session.getId(),
                session.getManager().getContainer().getName()));
        }

        return result;
    }

    @Override
    public synchronized void removeSession(Session session) {
        super.removeSession(session);
        metadata.removeHASessionData(new HASessionData(session.getId(),
                session.getManager().getContainer().getName()));
    }

    @Override
    public void setLastAccessTime(long lastAccessTime) {
        super.setLastAccessTime(lastAccessTime);
        metadata.setLastAccessTime(lastAccessTime);
    }

    @Override
    public long incrementAndGetVersion() {
        long ver = super.incrementAndGetVersion();
        metadata.setVersion(ver);
        return ver;
    }

    /** convert a principal into byte array */
    private byte[] convertToByteArray(Principal obj) {
        try (ByteArrayOutputStream baos = new ByteArrayOutputStream();
                ObjectOutputStream oos = ioUtils.createObjectOutputStream(baos, true)) {
            oos.writeObject(obj);
            oos.flush();
            return baos.toByteArray();
        } catch(Exception ex) {
            throw new IllegalStateException("Could not convert principal to byte array", ex);
        }
    }

    /** Parse a principal from metadata */
    private Principal parsePrincipal(HASingleSignOnEntryMetadata m) {
        try (ObjectInputStream ois = ioUtils.createObjectInputStream(
                new BufferedInputStream(new ByteArrayInputStream(m.getPrincipalBytes())), true,
                this.getClass().getClassLoader(), 0L)) {
            return (Principal) ois.readObject();
      } catch (Exception ex) {
          throw new IllegalStateException("Could not parse principal from HA-SSO Metadata", ex);
      }
    }
}