/** 清除當前線程中的Subject. */
public static void clearSubject() {
if (threadState != null) {
threadState.clear();
threadState = null;
}
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
// Check request type.
//
if (!(request instanceof HttpServletRequest)) {
raiseSecurityError(response, "Unexpected request class detected.");
return;
}
HttpServletRequest hsr = (HttpServletRequest) request;
// Try to match URL against exclude pattern.
//
String requestUri = hsr.getRequestURI();
if (excludePattern != null && excludePattern.matcher(requestUri).matches()) {
chain.doFilter(request, response);
return;
}
// Extract security token from custom header.
//
String token = hsr.getHeader(SECURITY_TOKEN);
logger.debug("Passed security token: " + token);
// SecurityResource token must be present.
//
if (token == null) {
logger.info("No token found in request header.");
raiseSecurityError(response, "Null token detected");
return;
}
// Check if the passed token is associated with a valid session.
//
try {
Session session = SecurityUtils.getSecurityManager().getSession(new DefaultSessionKey(token));
if (session == null) {
logger.info("Unable to find a valid session using token.");
raiseSecurityError(response, "Invalid session token.");
return;
}
// Ensure that the last accessed timestamp gets updated. This should be made
// internally by Shiro, but it looks like it is not working. Maybe the pattern
// employed here to get the session is not canonical...
//
session.touch();
} catch (SessionException se) {
logger.info(se.getMessage());
raiseSecurityError(response, "Invalid session token. Cause: " + se.getMessage());
return;
}
Subject requestSubject = new Subject.Builder().sessionId(token).buildSubject();
ThreadState threadState = new SubjectThreadState(requestSubject);
threadState.bind();
try {
chain.doFilter(request, response);
} finally {
threadState.clear();
}
}