public void doFilter()

in github-oauth/src/main/java/com/googlesource/gerrit/plugins/github/oauth/OAuthWebFilter.java [71:115]
39 lines of code
9 McCabe index (conditional complexity)

  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
      throws IOException, ServletException {

    HttpServletRequest httpRequest = (HttpServletRequest) request;
    HttpServletResponse httpResponse = (HttpServletResponse) response;
    log.debug(
        "OAuthWebFilter(" + httpRequest.getRequestURL() + ") code=" + request.getParameter("code"));

    Cookie gerritCookie = getGerritCookie(httpRequest);
    try {
      GitHubLogin ghLogin = loginProvider.get(httpRequest);

      if (OAuthProtocol.isOAuthRequest(httpRequest)) {
        login(request, httpRequest, httpResponse, ghLogin);
      } else {
        if (OAuthProtocol.isOAuthLogout(httpRequest)) {
          httpResponse = (HttpServletResponse) logout(request, httpResponse, chain, httpRequest);
        }

        if (ghLogin != null && ghLogin.isLoggedIn()) {
          httpRequest =
              new AuthenticatedHttpRequest(
                  httpRequest,
                  config.httpHeader,
                  ghLogin.getMyself().getLogin(),
                  config.oauthHttpHeader,
                  GITHUB_EXT_ID + ghLogin.getToken().accessToken);
        }

        chain.doFilter(httpRequest, httpResponse);
      }
    } finally {
      HttpSession httpSession = httpRequest.getSession();
      if (gerritCookie != null && httpSession != null) {
        String gerritCookieValue = gerritCookie.getValue();
        String gerritSessionValue = (String) httpSession.getAttribute("GerritAccount");

        if (gerritSessionValue == null) {
          httpSession.setAttribute("GerritAccount", gerritCookieValue);
        } else if (!gerritSessionValue.equals(gerritCookieValue)) {
          httpSession.invalidate();
        }
      }
    }
  }