org.ratpackframework.session.internal.ExchangeSessionManager.java Source code

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Here is the source code for org.ratpackframework.session.internal.ExchangeSessionManager.java

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/*
 * Copyright 2013 the original author or authors.
 *
 * 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.ratpackframework.session.internal;

import io.netty.handler.codec.http.Cookie;
import io.netty.handler.codec.http.DefaultCookie;
import org.ratpackframework.handling.Exchange;
import org.ratpackframework.session.Session;
import org.ratpackframework.session.SessionManager;

public class ExchangeSessionManager {

    private static final String COOKIE_NAME = "JSESSIONID";

    private final Exchange exchange;
    private final SessionManager sessionManager;

    private String cookieSessionId;
    private String assignedCookieId;

    public ExchangeSessionManager(Exchange exchange, SessionManager sessionManager) {
        this.exchange = exchange;
        this.sessionManager = sessionManager;
    }

    private String getCookieSessionId() {
        if (cookieSessionId == null) {
            Cookie match = null;

            for (Cookie cookie : exchange.getRequest().getCookies()) {
                if (cookie.getName().equals(COOKIE_NAME)) {
                    match = cookie;
                    break;
                }
            }

            if (match != null) {
                cookieSessionId = match.getValue();
            } else {
                cookieSessionId = "";
            }

        }

        return cookieSessionId.equals("") ? null : cookieSessionId;
    }

    public Session getSession() {
        return new Session() {
            public String getId() {
                return getSessionIdOrInit();
            }

            public String getExistingId() {
                return getCookieSessionId();
            }

            public String regen() {
                String existingId = getExistingId();
                if (existingId != null) {
                    sessionManager.notifySessionTerminated(existingId);
                }
                return assignId();

            }

            public void terminate() {
                String existingId = getExistingId();
                if (existingId == null) {
                    throw new IllegalStateException("Cannot terminate inactive session");
                }
                sessionManager.notifySessionTerminated(existingId);
                setCookie("", 0);
            }
        };
    }

    private String getSessionIdOrInit() {
        if (assignedCookieId != null) {
            return assignedCookieId;
        }

        String cookieSessionId = getCookieSessionId();
        if (cookieSessionId != null) {
            return cookieSessionId;
        }

        assignedCookieId = assignId();
        return assignedCookieId;
    }

    private String assignId() {
        String id = sessionManager.getIdGenerator().generateSessionId(exchange.getRequest());
        setCookie(id, sessionManager.getCookieExpiryMins());

        sessionManager.notifySessionInitiated(id);
        return id;
    }

    private void setCookie(String value, int expiryMins) {
        DefaultCookie cookie = new DefaultCookie(COOKIE_NAME, value);

        String cookieDomain = sessionManager.getCookieDomain();
        if (cookieDomain != null) {
            cookie.setDomain(cookieDomain);
        }

        String cookiePath = sessionManager.getCookiePath();
        if (cookiePath != null) {
            cookie.setPath(cookiePath);
        }

        if (expiryMins > 0) {
            cookie.setMaxAge(expiryMins * 60);
        }

        exchange.getResponse().getCookies().add(cookie);
    }

}