[CAS] 대체 로그인 필터 만들기!!!

생전에 접해볼 생각도 안해봤던 서블릿 필터를 CAS를 하면서 만들게 되었습니다.

구조는 replacementLoginUrl과 casServerLoginUrl를 init-param으로 받고 casServerLoginUrl을 HttpClient로 연결을 해봐서 문제가 없으면 filterChain으로 계속 처리를 하고 아니면 replacementLoginUrl 페이지로 리다이렉트 시킵니다.

import java.io.IOException; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; /** * CAS Client 대체 로그인 필터 * @author Vicki Yi * @version v201001201344 * */ public class CasReplacementLoginFilter implements Filter { private String replacementLoginUrl; private String casServerLoginUrl; public void setReplacementLoginUrl(String replacementLoginUrl) { this.replacementLoginUrl = replacementLoginUrl; } public void setCasServerLoginUrl(String casServerLoginUrl) { this.casServerLoginUrl = casServerLoginUrl; } @Override public void init(FilterConfig config) throws ServletException { final String value = config.getInitParameter("replacementLoginUrl"); if (value == null) { throw new IllegalArgumentException("replacementLoginUrl 파라미터가 초기화 되지 않았습니다."); } setReplacementLoginUrl(value); final String value2 = config.getInitParameter("casServerLoginUrl"); if (value2 == null) { throw new IllegalArgumentException("casServerLoginUrl 파라미터가 초기화 되지 않았습니다."); } setCasServerLoginUrl(value2); } @Override public void doFilter(final ServletRequest servletRequest, final ServletResponse servletResponse, final FilterChain filterChain) throws IOException, ServletException { final HttpServletRequest request = (HttpServletRequest) servletRequest; final HttpServletResponse response = (HttpServletResponse) servletResponse; HttpClient httpClient = new DefaultHttpClient(); try { httpClient.execute(new HttpGet(casServerLoginUrl)).getEntity(); filterChain.doFilter(request, response); } catch (Exception e) { response.sendRedirect(replacementLoginUrl); } } @Override public void destroy() { // nothing to do } }

중요한 것은 web.xml에서 CasAuthenticationFilter 보다 위에 정의를 해야 한다는 점입니다.
아래에 해버리면 아무 의미가 없어져 버린다는...

<filter-mapping> <filter-name>WiseOne CAS Replacement Login Filter</filter-name> <url-pattern>/index.jsp</url-pattern> </filter-mapping> <filter-mapping> <filter-name>CasAuthenticationFilter</filter-name> <url-pattern>/index.jsp</url-pattern> </filter-mapping>

CAS 전문가 과정 자체 이수 중...