sessionManager接口
public interface SessionManager {
Session start(SessionContext context);
Session getSession(SessionKey key) throws SessionException;
}
實現繼承
AbstractSessionManager定義了session過期時間globalSessionTimeout
AbstractNativeSessionManager定義了Collection<SessionListener> listeners，我們可以實現SessionListener接口，在觸發這些事件時候，做些事情
而這些listener起作用的地方就是
protected void notifyStart(Session session) {
for (SessionListener listener : this.listeners) {
listener.onStart(session);
}
}
protected void notifyStop(Session session) {
Session forNotification = beforeInvalidNotification(session);
for (SessionListener listener : this.listeners) {
listener.onStop(forNotification);
}
}
protected void notifyExpiration(Session session) {
Session forNotification = beforeInvalidNotification(session);
for (SessionListener listener : this.listeners) {
listener.onExpiration(forNotification);
}
}這個類中有對start和getSession的實現
start方法
public Session start(SessionContext context) {
Session session = createSession(context);
applyGlobalSessionTimeout(session);
onStart(session, context);
notifyStart(session);
//Don't expose the EIS-tier Session object to the client-tier:
return createExposedSession(session, context);
}
protected abstract Session createSession(SessionContext context) throws AuthorizationException;
protected void onStart(Session session, SessionContext context) {
}
protected Session createExposedSession(Session session, SessionContext context) {
return new DelegatingSession(this, new DefaultSessionKey(session.getId()));
}
getSession方法
public Session getSession(SessionKey key) throws SessionException {
Session session = lookupSession(key);
return session != null ? createExposedSession(session, key) : null;
}
private Session lookupSession(SessionKey key) throws SessionException {
if (key == null) {
throw new NullPointerException("SessionKey argument cannot be null.");
}
return doGetSession(key);
}
protected abstract Session doGetSession(SessionKey key) throws InvalidSessionException;
AbstractValidatingSessionManager作用是對所有的session檢測，字段sessionValidationSchedulerEnabled默認爲true，是否檢測
sessionValidationScheduler是具體去執行檢測的類
createSession方法的實現
protected Session createSession(SessionContext context) throws AuthorizationException {
enableSessionValidationIfNecessary();
return doCreateSession(context);
}
protected abstract Session doCreateSession(SessionContext initData) throws AuthorizationException;doGetSession方法實現
@Override
protected final Session doGetSession(final SessionKey key) throws InvalidSessionException {
enableSessionValidationIfNecessary();
log.trace("Attempting to retrieve session with key {}", key);
Session s = retrieveSession(key);
if (s != null) {
validate(s, key);
}
return s;
}
/**
* Looks up a session from the underlying data store based on the specified session key.
*
* @param key the session key to use to look up the target session.
* @return the session identified by {@code sessionId}.
* @throws UnknownSessionException if there is no session identified by {@code sessionId}.
*/
protected abstract Session retrieveSession(SessionKey key) throws UnknownSessionException;
其中都用到了enableSessionValidationIfNecessary();這個方法就是去檢測
private void enableSessionValidationIfNecessary() {
SessionValidationScheduler scheduler = getSessionValidationScheduler();
if (isSessionValidationSchedulerEnabled() && (scheduler == null || !scheduler.isEnabled())) {
enableSessionValidation();
}
}
protected synchronized void enableSessionValidation() {
SessionValidationScheduler scheduler = getSessionValidationScheduler();
if (scheduler == null) {
scheduler = createSessionValidationScheduler();
setSessionValidationScheduler(scheduler);
if (log.isInfoEnabled()) {
log.info("Enabling session validation scheduler...");
}
scheduler.enableSessionValidation();
afterSessionValidationEnabled();
}
}
protected SessionValidationScheduler createSessionValidationScheduler() {
ExecutorServiceSessionValidationScheduler scheduler;
if (log.isDebugEnabled()) {
log.debug("No sessionValidationScheduler set. Attempting to create default instance.");
}
scheduler = new ExecutorServiceSessionValidationScheduler(this);//默認的
scheduler.setInterval(getSessionValidationInterval());
if (log.isTraceEnabled()) {
log.trace("Created default SessionValidationScheduler instance of type [" + scheduler.getClass().getName() + "].");
}
return scheduler;
}
protected void afterSessionValidationEnabled() {
}
DefaultSessionManager是DefaultSecurityManager使用的默認實現，用於JavaSE環境，sessionFactory默認使用SimpleSessionFactory，
sessionDAO默認使用MemorySessionDAO
doCreateSession的實現
protected Session doCreateSession(SessionContext context) {
Session s = newSessionInstance(context);
if (log.isTraceEnabled()) {
log.trace("Creating session for host {}", s.getHost());
}
create(s);
return s;
}
protected Session newSessionInstance(SessionContext context) {
return getSessionFactory().createSession(context);
}
protected void create(Session session) {
if (log.isDebugEnabled()) {
log.debug("Creating new EIS record for new session instance [" + session + "]");
}
sessionDAO.create(session);
}
retrieveSession的實現
protected Session retrieveSession(SessionKey sessionKey) throws UnknownSessionException {
Serializable sessionId = getSessionId(sessionKey);
if (sessionId == null) {
log.debug("Unable to resolve session ID from SessionKey [{}]. Returning null to indicate a " +
"session could not be found.", sessionKey);
return null;
}
Session s = retrieveSessionFromDataSource(sessionId);
if (s == null) {
//session ID was provided, meaning one is expected to be found, but we couldn't find one:
String msg = "Could not find session with ID [" + sessionId + "]";
throw new UnknownSessionException(msg);
}
return s;
}
protected Serializable getSessionId(SessionKey sessionKey) {
return sessionKey.getSessionId();
}
protected Session retrieveSessionFromDataSource(Serializable sessionId) throws UnknownSessionException {
return sessionDAO.readSession(sessionId);
}
DefaultWebSessionManager用於Web環境的實現，可以替代ServletContainerSessionManager，自己維護着會話
public DefaultWebSessionManager() {
Cookie cookie = new SimpleCookie(ShiroHttpSession.DEFAULT_SESSION_ID_NAME);
cookie.setHttpOnly(true); //more secure, protects against XSS attacks
this.sessionIdCookie = cookie;
this.sessionIdCookieEnabled = true;
} /**
* Stores the Session's ID, usually as a Cookie, to associate with future requests.
*
* @param session the session that was just {@link #createSession created}.
*/
@Override
protected void onStart(Session session, SessionContext context) {
super.onStart(session, context);
if (!WebUtils.isHttp(context)) {
log.debug("SessionContext argument is not HTTP compatible or does not have an HTTP request/response " +
"pair. No session ID cookie will be set.");
return;
}
HttpServletRequest request = WebUtils.getHttpRequest(context);
HttpServletResponse response = WebUtils.getHttpResponse(context);
if (isSessionIdCookieEnabled()) {
Serializable sessionId = session.getId();
storeSessionId(sessionId, request, response);
} else {
log.debug("Session ID cookie is disabled. No cookie has been set for new session with id {}", session.getId());
}
request.removeAttribute(ShiroHttpServletRequest.REFERENCED_SESSION_ID_SOURCE);
request.setAttribute(ShiroHttpServletRequest.REFERENCED_SESSION_IS_NEW, Boolean.TRUE);
}
private void storeSessionId(Serializable currentId, HttpServletRequest request, HttpServletResponse response) {
if (currentId == null) {
String msg = "sessionId cannot be null when persisting for subsequent requests.";
throw new IllegalArgumentException(msg);
}
Cookie template = getSessionIdCookie();
Cookie cookie = new SimpleCookie(template);
String idString = currentId.toString();
cookie.setValue(idString);
cookie.saveTo(request, response);
log.trace("Set session ID cookie for session with id {}", idString);
}
getSessionId方法重寫
@Override
public Serializable getSessionId(SessionKey key) {
Serializable id = super.getSessionId(key);
if (id == null && WebUtils.isWeb(key)) {
ServletRequest request = WebUtils.getRequest(key);
ServletResponse response = WebUtils.getResponse(key);
id = getSessionId(request, response);
}
return id;
}
protected Serializable getSessionId(ServletRequest request, ServletResponse response) {
return getReferencedSessionId(request, response);
}
private Serializable getReferencedSessionId(ServletRequest request, ServletResponse response) {
String id = getSessionIdCookieValue(request, response); //從cookie讀取
if (id != null) {
request.setAttribute(ShiroHttpServletRequest.REFERENCED_SESSION_ID_SOURCE,
ShiroHttpServletRequest.COOKIE_SESSION_ID_SOURCE);//設置sessionid位置
} else {
//not in a cookie, or cookie is disabled - try the request URI as a fallback (i.e. due to URL rewriting):
//try the URI path segment parameters first:
id = getUriPathSegmentParamValue(request, ShiroHttpSession.DEFAULT_SESSION_ID_NAME);//從url截取
if (id == null) {
//not a URI path segment parameter, try the query parameters:
String name = getSessionIdName();
id = request.getParameter(name);//從request的參數取
if (id == null) {
//try lowercase:
id = request.getParameter(name.toLowerCase());
}
}
if (id != null) {
request.setAttribute(ShiroHttpServletRequest.REFERENCED_SESSION_ID_SOURCE,
ShiroHttpServletRequest.URL_SESSION_ID_SOURCE);
}
}
if (id != null) {
request.setAttribute(ShiroHttpServletRequest.REFERENCED_SESSION_ID, id);
//automatically mark it valid here. If it is invalid, the
//onUnknownSession method below will be invoked and we'll remove the attribute at that time.
request.setAttribute(ShiroHttpServletRequest.REFERENCED_SESSION_ID_IS_VALID, Boolean.TRUE);
}
return id;
}
重寫了AbstractNativeSessionManager的createExposedSession，將DelegatingSession的key換成WebSessionKey
protected Session createExposedSession(Session session, SessionContext context) {
if (!WebUtils.isWeb(context)) {
return super.createExposedSession(session, context);
}
ServletRequest request = WebUtils.getRequest(context);
ServletResponse response = WebUtils.getResponse(context);
SessionKey key = new WebSessionKey(session.getId(), request, response);
return new DelegatingSession(this, key);
}ServletContainerSessionManager implements WebSessionManager extends SessionManager
DefaultWebSecurityManager使用的默認實現，用於Web環境，其直接使用Servlet容器的會話
public class ServletContainerSessionManager implements WebSessionManager {
//TODO - complete JavaDoc
//TODO - read session timeout value from web.xml
public ServletContainerSessionManager() {
}
public Session start(SessionContext context) throws AuthorizationException {
return createSession(context);
}
public Session getSession(SessionKey key) throws SessionException {
if (!WebUtils.isHttp(key)) {
String msg = "SessionKey must be an HTTP compatible implementation.";
throw new IllegalArgumentException(msg);
}
HttpServletRequest request = WebUtils.getHttpRequest(key);
Session session = null;
HttpSession httpSession = request.getSession(false);
if (httpSession != null) {
session = createSession(httpSession, request.getRemoteHost());
}
return session;
}
private String getHost(SessionContext context) {
String host = context.getHost();
if (host == null) {
ServletRequest request = WebUtils.getRequest(context);
if (request != null) {
host = request.getRemoteHost();
}
}
return host;
}
/**
* @since 1.0
*/
protected Session createSession(SessionContext sessionContext) throws AuthorizationException {
if (!WebUtils.isHttp(sessionContext)) {
String msg = "SessionContext must be an HTTP compatible implementation.";
throw new IllegalArgumentException(msg);
}
HttpServletRequest request = WebUtils.getHttpRequest(sessionContext);
HttpSession httpSession = request.getSession();
//SHIRO-240: DO NOT use the 'globalSessionTimeout' value here on the acquired session.
//see: https://issues.apache.org/jira/browse/SHIRO-240
String host = getHost(sessionContext);
return createSession(httpSession, host);
}
protected Session createSession(HttpSession httpSession, String host) {
return new HttpServletSession(httpSession, host);
}
/**
* This implementation always delegates to the servlet container for sessions, so this method returns
* {@code true} always.
*
* @return {@code true} always
* @since 1.2
*/
public boolean isServletContainerSessions() {
return true;
}
}SessionManager使用在SessionsSecurityManager
private SessionManager sessionManager;
/**
* Default no-arg constructor, internally creates a suitable default {@link SessionManager SessionManager} delegate
* instance.
*/
public SessionsSecurityManager() {
super();
this.sessionManager = new DefaultSessionManager();
applyCacheManagerToSessionManager();
} public Session start(SessionContext context) throws AuthorizationException {
return this.sessionManager.start(context);
}
public Session getSession(SessionKey key) throws SessionException {
return this.sessionManager.getSession(key);
}Subject中取得session最終是有securityManager完成
public Session getSession(boolean create) {
if (log.isTraceEnabled()) {
log.trace("attempting to get session; create = " + create +
"; session is null = " + (this.session == null) +
"; session has id = " + (this.session != null && session.getId() != null));
}
if (this.session == null && create) {
//added in 1.2:
if (!isSessionCreationEnabled()) {
String msg = "Session creation has been disabled for the current subject. This exception indicates " +
"that there is either a programming error (using a session when it should never be " +
"used) or that Shiro's configuration needs to be adjusted to allow Sessions to be created " +
"for the current Subject. See the " + DisabledSessionException.class.getName() + " JavaDoc " +
"for more.";
throw new DisabledSessionException(msg);
}
log.trace("Starting session for host {}", getHost());
SessionContext sessionContext = createSessionContext();
Session session = this.securityManager.start(sessionContext);
this.session = decorate(session);
}
return this.session;
}