public static void main(String[] args) throws Exception {
    // create the keys
    KeyPair pair = Utils.generateRSAKeyPair();

    // create the input stream
    ByteArrayOutputStream bOut = new ByteArrayOutputStream();

    if (outputFormat.equals(DER)) {
      bOut.write(X509V1CreateExample.generateV1Certificate(pair).getEncoded());
    } else if (outputFormat.equals(PEM)) {
      PEMWriter pemWriter = new PEMWriter(new OutputStreamWriter(bOut));
      pemWriter.writeObject(X509V1CreateExample.generateV1Certificate(pair));
      pemWriter.close();
    }

    bOut.close();

    // Print the contents of bOut

    System.out.println(outputFormat.equals(DER) ? "DER-format:" : "PEM-format:");

    System.out.println(Utils.toString(bOut.toByteArray()));

    InputStream in = new ByteArrayInputStream(bOut.toByteArray());

    // create the certificate factory
    CertificateFactory fact = CertificateFactory.getInstance("X.509", "BC");

    // read the certificate
    X509Certificate x509Cert = (X509Certificate) fact.generateCertificate(in);

    System.out.println("issuer: " + x509Cert.getIssuerX500Principal());
  }
Example #2
0
 public void run() {
   try {
     InputStream in;
     OutputStream out;
     try {
       in = sk.getInputStream();
       out = sk.getOutputStream();
     } catch (IOException e) {
       throw (new RuntimeException(e));
     }
     while (true) {
       try {
         int len = Utils.int32d(read(in, 4), 0);
         if (!auth && (len > 256)) return;
         Message msg = new MessageBuf(read(in, len));
         String cmd = msg.string();
         Object[] args = msg.list();
         Object[] reply;
         if (auth) {
           Command cc = commands.get(cmd);
           if (cc != null) reply = cc.run(this, args);
           else reply = new Object[] {"nocmd"};
         } else {
           if (cmd.equals("nonce")) {
             reply = new Object[] {nonce};
           } else if (cmd.equals("auth")) {
             if (Arrays.equals((byte[]) args[0], ckey)) {
               reply = new Object[] {"ok"};
               auth = true;
             } else {
               reply = new Object[] {"no"};
             }
           } else {
             return;
           }
         }
         MessageBuf rb = new MessageBuf();
         rb.addlist(reply);
         byte[] rbuf = new byte[4 + rb.size()];
         Utils.uint32e(rb.size(), rbuf, 0);
         rb.fin(rbuf, 4);
         out.write(rbuf);
       } catch (IOException e) {
         return;
       }
     }
   } catch (InterruptedException e) {
   } finally {
     try {
       sk.close();
     } catch (IOException e) {
       throw (new RuntimeException(e));
     }
   }
 }
  /**
   * Create a payment request. You may want to sign the request using {@link #signPaymentRequest}.
   * Use {@link Protos.PaymentRequest.Builder#build} to get the actual payment request.
   *
   * @param params network parameters
   * @param outputs list of outputs to request coins to
   * @param memo arbitrary, user readable memo, or null if none
   * @param paymentUrl URL to send payment message to, or null if none
   * @param merchantData arbitrary merchant data, or null if none
   * @return created payment request, in its builder form
   */
  public static Protos.PaymentRequest.Builder createPaymentRequest(
      NetworkParameters params,
      List<Protos.Output> outputs,
      @Nullable String memo,
      @Nullable String paymentUrl,
      @Nullable byte[] merchantData) {
    final Protos.PaymentDetails.Builder paymentDetails = Protos.PaymentDetails.newBuilder();
    paymentDetails.setNetwork(params.getPaymentProtocolId());
    for (Protos.Output output : outputs) paymentDetails.addOutputs(output);
    if (memo != null) paymentDetails.setMemo(memo);
    if (paymentUrl != null) paymentDetails.setPaymentUrl(paymentUrl);
    if (merchantData != null) paymentDetails.setMerchantData(ByteString.copyFrom(merchantData));
    paymentDetails.setTime(Utils.currentTimeSeconds());

    final Protos.PaymentRequest.Builder paymentRequest = Protos.PaymentRequest.newBuilder();
    paymentRequest.setSerializedPaymentDetails(paymentDetails.build().toByteString());
    return paymentRequest;
  }
Example #4
0
 public static void main(String[] args) throws Exception {
   new Server(Integer.parseInt(args[0]), Utils.base64dec(System.getenv("AUTHKEY")));
 }
/**
 * Created with IntelliJ IDEA. User: ciobi Date: 2013-06-15 Time: 09:56
 *
 * <p>
 */
public class ReaderHandler extends WebAppContext {

  public static final Log LOG = LogFactory.getLog(ReaderHandler.class);
  // ttt1 option that on http only redirects to https, for all paths

  public static final String ACTION_LOGIN = "******";
  public static final String ACTION_SIGNUP = "signup";
  public static final String ACTION_CHANGE_PASSWORD = "******";
  public static final String ACTION_CHANGE_SETTINGS = "change_settings";
  public static final String ACTION_ADD_FEED = "add_feed";
  public static final String ACTION_REMOVE_FEED = "remove_feed";
  public static final String ACTION_UPDATE_FEED_LIST = "update_feed_list"; // for ordering, //ttt2

  public static final String PATH_LOGIN = "******" + ACTION_LOGIN;
  public static final String PATH_CHANGE_PASSWORD = "******" + ACTION_CHANGE_PASSWORD;
  public static final String PATH_CHANGE_SETTINGS = "/" + ACTION_CHANGE_SETTINGS;
  public static final String PATH_SIGNUP = "/" + ACTION_SIGNUP;
  public static final String PATH_ADD_FEED = "/" + ACTION_ADD_FEED;
  public static final String PATH_REMOVE_FEED = "/" + ACTION_REMOVE_FEED;
  public static final String PATH_UPDATE_FEED_LIST = "/" + ACTION_UPDATE_FEED_LIST;
  public static final String PATH_ERROR = "/error";
  public static final String PATH_LOGOUT = "/logout";
  public static final String PATH_SETTINGS = "/settings";
  public static final String PATH_FEEDS = "/feeds";
  public static final String PATH_FEED = "/feed";
  public static final String PATH_ADMIN = "/admin";
  public static final String PATH_FEED_ADMIN = "/feed_admin";
  public static final String PATH_OPEN_ARTICLE =
      "/open_article/"; // !!! it's easier to end this one with a slash

  // params we use to send strings to the JSPs or to get user input in POST, via
  // request.getParameter(), or both
  public static final String PARAM_USER_ID = "userId";
  public static final String PARAM_USER_NAME = "name";
  public static final String PARAM_EMAIL = "email";
  public static final String PARAM_CURRENT_PASSWORD = "******";
  public static final String PARAM_PASSWORD = "******";
  public static final String PARAM_PASSWORD_CONFIRM = "passwordConfirm";
  public static final String PARAM_PATH = "path";
  // public static final String PARAM_ERROR = "error";
  public static final String PARAM_REMEMBER_ACCOUNT = "rememberAccount";
  public static final String PARAM_NEW_FEED_URL = "feedUrl";
  public static final String PARAM_FEED_ID = "feedId";
  public static final String PARAM_ITEMS_PER_PAGE = "itemsPerPage";
  public static final String PARAM_STYLE = "style";
  public static final String PARAM_FEED_DATE_FORMAT = "feedDateFormat";

  // variable names, used to give JSPs access to Java objects in the handler via
  // request.getAttribute(()
  public static final String VAR_USER = "******";
  public static final String VAR_LOGIN_INFO = "loginInfo";
  public static final String VAR_USER_DB = "userDb";
  public static final String VAR_FEED_DB = "feedDb";
  public static final String VAR_ARTICLE_DB = "articleDb";
  public static final String VAR_READ_ARTICLES_COLL_DB = "readArticlesCollDb";

  public static final String BROWSER_ID = "browserId";
  public static final String SESSION_ID = "sessionId";

  private LoginInfo.DB loginInfoDb;
  private User.DB userDb;
  private Feed.DB feedDb;
  private Article.DB articleDb;
  private ReadArticlesColl.DB readArticlesCollDb;

  private UserHelpers userHelpers;

  private boolean isInJar = Utils.isInJar();

  private static class ReaderErrorHandler extends ErrorHandler {
    @Override // !!! note that this gets called for missing pages, but not if exceptions are thrown;
              // exceptions are handled separately
    public void handle(
        String target,
        Request request,
        HttpServletRequest httpServletRequest,
        HttpServletResponse httpServletResponse)
        throws IOException {
      request.setHandled(true);
      httpServletResponse
          .getWriter()
          .println(
              String.format("<h1>Page doesn't exist: %s</h1>", request.getUri().getDecodedPath()));
    }
  }

  private static HashMap<String, String> PATH_MAPPING = new HashMap<>();

  static {
    PATH_MAPPING.put("", "home_page");
    PATH_MAPPING.put(PATH_LOGIN, "login");
    PATH_MAPPING.put(PATH_LOGOUT, "login"); // !!! after logout we get redirected to /login
    PATH_MAPPING.put(PATH_SIGNUP, "signup");
    PATH_MAPPING.put(PATH_ERROR, "error");
    PATH_MAPPING.put(PATH_FEED_ADMIN, "feed_admin");
    PATH_MAPPING.put(PATH_SETTINGS, "settings");
    PATH_MAPPING.put(PATH_FEEDS, "feeds");
    PATH_MAPPING.put(PATH_FEED + "/*", "feed");
    PATH_MAPPING.put(PATH_ADMIN, "admin");
  }

  public ReaderHandler(LowLevelDbAccess lowLevelDbAccess, String webDir) {

    loginInfoDb = new LoginInfo.DB(lowLevelDbAccess);
    userDb = new User.DB(lowLevelDbAccess);
    feedDb = new Feed.DB(lowLevelDbAccess);
    articleDb = new Article.DB(lowLevelDbAccess);
    readArticlesCollDb = new ReadArticlesColl.DB(lowLevelDbAccess);
    userHelpers = new UserHelpers(loginInfoDb, userDb);

    setContextPath("/");

    File warPath = new File(webDir);
    setWar(warPath.getAbsolutePath());

    if (isInJar) {
      for (Map.Entry<String, String> entry : PATH_MAPPING.entrySet()) {
        addPrebuiltJsp(entry.getKey(), "jsp." + entry.getValue().replaceAll("_", "_005f") + "_jsp");
      }
    } else {
      for (Map.Entry<String, String> entry : PATH_MAPPING.entrySet()) {
        addServlet(
            new ServletHolder(new RedirectServlet("/" + entry.getValue() + ".jsp")),
            entry.getKey());
      }
    }

    setErrorHandler(new ReaderErrorHandler());
  }

  private void addPrebuiltJsp(String path, String className) {
    try {
      Class clazz =
          Class.forName(
              className); // ttt2 see if possible to not use this, preferably without doing
                          // redirections like RedirectServlet
      Object obj = clazz.newInstance();
      addServlet(new ServletHolder((Servlet) obj), path);
      LOG.info("Added prebuilt JSP: " + obj.toString());
    } catch (Exception e) {
      LOG.fatal(String.format("Failed to load prebuilt JSP for %s and %s", path, className), e);
    }
  }

  @Override
  public void doHandle(
      String target,
      Request request,
      HttpServletRequest httpServletRequest,
      HttpServletResponse httpServletResponse)
      throws IOException, ServletException {

    LOG.info("handling " + target);

    // !!! doHandle() is called twice for a request when using redirectiion, first time with
    // request.getPathInfo()
    // set to the URI and target set to the path, then with request.getPathInfo() set to null and
    // target set to the .jsp
    try {
      // request.setHandled(true);
      boolean secured;
      if (request.getScheme().equals("https")) {
        secured = true;
      } else if (request.getScheme().equals("http")) {
        secured = false;
      } else {
        httpServletResponse
            .getWriter()
            .println(
                String.format(
                    "<h1>Unknown scheme %s at %s</h1>",
                    request.getScheme(), request.getUri().getDecodedPath()));
        return;
      }

      if (request.getMethod().equals("GET")) {
        if (isInJar || target.endsWith(".jsp")) {
          // !!! when not in jar there's no need to do anything about params if it's not a .jsp,
          // as this will get called again for the corresponding .jsp
          if (prepareForJspGet(target, request, httpServletResponse, secured)) {
            return;
          }
        }
        if (target.startsWith(PATH_OPEN_ARTICLE)) {
          handleOpenArticle(request, httpServletResponse, target);
          return;
        }
        super.doHandle(target, request, httpServletRequest, httpServletResponse);
        LOG.info("handling of " + target + " went to super");

        // httpServletResponse.setDateHeader("Date", System.currentTimeMillis());     //ttt2 review
        // these, probably not use
        // httpServletResponse.setDateHeader("Expires", System.currentTimeMillis() + 60000);

        return;
      }

      if (request.getMethod().equals("POST")) {
        if (request.getUri().getDecodedPath().equals(PATH_LOGIN)) {
          handleLoginPost(request, httpServletResponse, secured);
        } else if (request.getUri().getDecodedPath().equals(PATH_SIGNUP)) {
          handleSignupPost(request, httpServletResponse);
        } else if (request.getUri().getDecodedPath().equals(PATH_CHANGE_PASSWORD)) {
          handleChangePasswordPost(request, httpServletResponse);
        } else if (request.getUri().getDecodedPath().equals(PATH_UPDATE_FEED_LIST)) {
          handleUpdateFeedListPost(request, httpServletResponse);
        } else if (request.getUri().getDecodedPath().equals(PATH_ADD_FEED)) {
          handleAddFeedPost(request, httpServletResponse);
        } else if (request.getUri().getDecodedPath().equals(PATH_REMOVE_FEED)) {
          handleRemoveFeedPost(request, httpServletResponse);
        } else if (request.getUri().getDecodedPath().equals(PATH_CHANGE_SETTINGS)) {
          handleChangeSettingsPost(request, httpServletResponse);
        }
      }

      /*{ // for tests only;
          httpServletResponse.getWriter().println(String.format("<h1>Unable to process request %s</h1>",
                  request.getUri().getDecodedPath()));
          request.setHandled(true);
      }*/
    } catch (Exception e) {
      LOG.error("Error processing request", e);
      try {
        // redirectToError(e.toString(), request, httpServletResponse); //!!! redirectToError leads
        // to infinite loop, probably related to
        // the fact that we get 2 calls for a regular request when redirecting
        httpServletResponse
            .getWriter()
            .println(
                String.format(
                    "<h1>Unable to process request %s</h1>", // ttt1 generate some HTML
                    request.getUri().getDecodedPath()));
        request.setHandled(true);
      } catch (Exception e1) {
        LOG.error("Error redirecting", e1);
      }
    }
  }

  /**
   * Normally sets the path and a few attributes that the JSPs are likely to need. Also verifies the
   * login information. If necessary, just redirects to the login page.
   *
   * @param target
   * @param request
   * @param httpServletResponse
   * @param secured
   * @return true if the request is already handled so the .jsp shouldn't get called
   * @throws Exception
   */
  private boolean prepareForJspGet(
      String target, Request request, HttpServletResponse httpServletResponse, boolean secured)
      throws Exception {

    LoginInfo.SessionInfo sessionInfo = UserHelpers.getSessionInfo(request);

    LOG.info(
        String.format(
            "hndl - %s ; %s; %s ; %s",
            target,
            request.getPathInfo(),
            request.getMethod(),
            secured ? "secured" : "not secured"));

    String path = request.getUri().getDecodedPath();

    boolean redirectToLogin = path.equals(PATH_LOGOUT);
    LoginInfo loginInfo = null;
    if (sessionInfo.isNull()) {
      redirectToLogin = true;
      LOG.info("Null session info. Logging in again.");
    } else {
      loginInfo =
          loginInfoDb.get(
              sessionInfo.browserId,
              sessionInfo.sessionId); // ttt2 use a cache, to avoid going to DB
      if (loginInfo == null || loginInfo.expiresOn < System.currentTimeMillis()) {
        LOG.info("Session has expired. Logging in again. Info: " + loginInfo);
        redirectToLogin = true;
      }
    }

    if (!path.equals(PATH_LOGIN) && !path.equals(PATH_SIGNUP) && !path.equals(PATH_ERROR)) {

      if (redirectToLogin) {
        // ttt2 perhaps store URI, to return to it after login
        logOut(sessionInfo.browserId);
        addLoginParams(request, loginInfo);
        httpServletResponse.sendRedirect(PATH_LOGIN);
        return true;
      }

      User user = userDb.get(loginInfo.userId);
      if (user == null) {
        WebUtils.redirectToError("Unknown user", request, httpServletResponse);
        return true;
      }
      if (!user.active) {
        WebUtils.redirectToError("Account is not active", request, httpServletResponse);
        return true;
      }
      request.setAttribute(VAR_FEED_DB, feedDb);
      request.setAttribute(VAR_USER_DB, userDb);
      request.setAttribute(VAR_ARTICLE_DB, articleDb);
      request.setAttribute(VAR_READ_ARTICLES_COLL_DB, readArticlesCollDb);

      request.setAttribute(VAR_USER, user);
      request.setAttribute(VAR_LOGIN_INFO, loginInfo);

      MultiMap<String> params = new MultiMap<>();
      params.put(PARAM_PATH, path);
      request.setParameters(params);
    }

    if (path.equals(PATH_LOGIN)) {
      addLoginParams(request, loginInfo);
    }
    return false;
  }

  private void handleOpenArticle(
      Request request, HttpServletResponse httpServletResponse, String target) throws Exception {
    try {
      int k1 = target.indexOf('/', 1);
      int k2 = target.indexOf('/', k1 + 1);
      String feedId = target.substring(k1 + 1, k2);
      String strSeq = target.substring(k2 + 1);
      int seq = Integer.parseInt(strSeq);
      Article article = articleDb.get(feedId, seq);
      LoginInfo loginInfo = userHelpers.getLoginInfo(request);
      // ttt2 using the link from a non-authenticated browser causes a NPE; maybe do something
      // better, e.g. sign up
      ReadArticlesColl readArticlesColl = readArticlesCollDb.get(loginInfo.userId, feedId);
      if (readArticlesColl == null) {
        readArticlesColl = new ReadArticlesColl(loginInfo.userId, feedId);
      }
      if (!readArticlesColl.isRead(seq)) {
        readArticlesColl.markRead(seq, Config.getConfig().maxSizeForReadArticles);
        readArticlesCollDb.add(readArticlesColl);
      }
      String s =
          URIUtil.encodePath(article.url)
              .replace("%3F", "?")
              .replace("%23", "#"); // ttt2 see how to do this right
      httpServletResponse.sendRedirect(s);
    } catch (Exception e) {
      WebUtils.showResult(
          String.format("Failed to get article for path %s. %s", target, e),
          "/",
          request,
          httpServletResponse);
    }
  }

  private void handleSignupPost(Request request, HttpServletResponse httpServletResponse)
      throws Exception {
    String userId = request.getParameter(PARAM_USER_ID);
    String userName = request.getParameter(PARAM_USER_NAME);
    String email = request.getParameter(PARAM_EMAIL);
    String stringPassword = request.getParameter(PARAM_PASSWORD);
    String stringPasswordConfirm = request.getParameter(PARAM_PASSWORD_CONFIRM);

    if (!stringPassword.equals(stringPasswordConfirm)) {
      WebUtils.redirectToError(
          "Mismatch between password and password confirmation", request, httpServletResponse);
      return;
    }

    SecureRandom secureRandom = new SecureRandom();
    String salt = "" + secureRandom.nextLong();
    byte[] password = User.computeHashedPassword(stringPassword, salt);
    User user = userDb.get(userId);
    if (user != null) {
      WebUtils.redirectToError(
          "There already exists a user with the ID " + userId, request, httpServletResponse);
      return;
    }

    user =
        new User(
            userId,
            userName,
            password,
            salt,
            email,
            new ArrayList<String>(),
            Config.getConfig().activateAccountsAtCreation,
            false);
    // ttt2 add confirmation by email, captcha, ...
    List<String> fieldErrors = user.checkFields();
    if (!fieldErrors.isEmpty()) {
      StringBuilder bld =
          new StringBuilder("Invalid values when trying to create user with ID ")
              .append(userId)
              .append("<br/>");
      for (String s : fieldErrors) {
        bld.append(s).append("<br/>");
      }
      WebUtils.redirectToError(bld.toString(), request, httpServletResponse);
      return;
    }

    // ttt2 2 clients can add the same userId simultaneously
    userDb.add(user);

    httpServletResponse.sendRedirect("/");
  }

  private void handleChangePasswordPost(Request request, HttpServletResponse httpServletResponse)
      throws Exception {

    LoginInfo loginInfo = userHelpers.getLoginInfo(request);
    if (loginInfo == null) {
      WebUtils.redirectToError("Couldn't determine the current user", request, httpServletResponse);
      return;
    }

    String userId = loginInfo.userId;
    String stringCrtPassword = request.getParameter(PARAM_CURRENT_PASSWORD);
    String stringNewPassword = request.getParameter(PARAM_PASSWORD);
    String stringNewPasswordConfirm = request.getParameter(PARAM_PASSWORD_CONFIRM);

    if (!stringNewPassword.equals(stringNewPasswordConfirm)) {
      showResult(
          "Mismatch between password and password confirmation",
          PATH_SETTINGS,
          request,
          httpServletResponse);
      return;
    }

    User user =
        userDb.get(
            userId); // ttt1 crashes for wrong ID; 2013.07.20 - no longer have an idea what this is
                     // about
    if (user == null) {
      WebUtils.redirectToError("Couldn't find the current user", request, httpServletResponse);
      return;
    }

    if (!user.checkPassword(stringCrtPassword)) {
      showResult("Incorrect current password", PATH_SETTINGS, request, httpServletResponse);
      return;
    }

    SecureRandom secureRandom = new SecureRandom();
    String salt = "" + secureRandom.nextLong();
    byte[] password = User.computeHashedPassword(stringNewPassword, salt);
    user.salt = salt;
    user.password = password;

    // ttt3 2 clients can change the password simultaneously
    userDb.add(user);

    // httpServletResponse.sendRedirect(PATH_SETTINGS);
    showResult("Password changed", PATH_SETTINGS, request, httpServletResponse);
  }

  private void handleChangeSettingsPost(Request request, HttpServletResponse httpServletResponse)
      throws Exception {

    LoginInfo loginInfo = userHelpers.getLoginInfo(request);
    if (loginInfo == null) {
      WebUtils.redirectToError("Couldn't determine the current user", request, httpServletResponse);
      return;
    }

    String stringItemsPerPage = request.getParameter(PARAM_ITEMS_PER_PAGE);
    try {
      loginInfo.itemsPerPage = Integer.parseInt(stringItemsPerPage);
    } catch (Exception e) {
      showResult(
          "Error trying to set the items per page. Expected integer value but got "
              + stringItemsPerPage,
          PATH_SETTINGS,
          request,
          httpServletResponse);
      return;
    }
    loginInfo.style = request.getParameter(PARAM_STYLE);
    loginInfo.feedDateFormat =
        request.getParameter(PARAM_FEED_DATE_FORMAT); // ttt2 validate, better in JSP

    loginInfoDb.add(loginInfo);

    // httpServletResponse.sendRedirect(PATH_SETTINGS);
    showResult("Settings changed", "/", request, httpServletResponse);
  }

  private void handleUpdateFeedListPost(Request request, HttpServletResponse httpServletResponse)
      throws Exception {
    LOG.info("updating feed list"); // ttt2 implement
    httpServletResponse.sendRedirect(PATH_FEED_ADMIN);
  }

  private void handleAddFeedPost(Request request, HttpServletResponse httpServletResponse)
      throws Exception {
    LOG.info("adding feed");
    User user = userHelpers.getUser(request);

    try {
      if (user == null) {
        LOG.error("User not found");
        return;
      }

      String url = request.getParameter(PARAM_NEW_FEED_URL);
      // ttt1 add some validation; probably best try to actually get data, set the title, ...
      if (url == null || url.equals("")) {
        LOG.error("New feed not specified");
        // ttt1 show some error
        return;
      }

      MessageDigest digest = MessageDigest.getInstance("MD5");
      String feedId = PrintUtils.byteArrayAsUrlString(digest.digest(url.getBytes("UTF-8")));
      feedId = feedId.substring(0, Config.getConfig().feedIdSize);

      Feed feed = feedDb.get(feedId);
      if (feed == null) {
        feed = new Feed(feedId, url);
        feedDb.add(feed);
      }

      if (user.feedIds.contains(feedId)) {
        LOG.error(String.format("Trying to add existing feed %s to user %s", feedId, user));
      } else {
        user.feedIds.add(feedId);
        userDb.updateFeeds(user);
      }
    } finally {
      httpServletResponse.sendRedirect(PATH_FEED_ADMIN);
    }
  }

  private void handleRemoveFeedPost(Request request, HttpServletResponse httpServletResponse)
      throws Exception {
    LOG.info("removing feed");
    User user = userHelpers.getUser(request);

    try {
      if (user == null) {
        LOG.error("User not found");
        return;
      }

      String feedId = request.getParameter(PARAM_FEED_ID);

      LOG.info(String.format("Removing feed %s for user %s", feedId, user));

      // ttt1 add some validation; probably best try to actually get data, set the title, ...
      if (feedId == null || feedId.equals("")) {
        LOG.error("feed not specified");
        // ttt1 show some error
        return;
      }

      if (user.feedIds.remove(
          feedId)) { // ttt2 clean up the global feed table; that's probably better done if nobody
                     // accesses a feed for 3 months or so
        userDb.updateFeeds(user);
        LOG.info(String.format("Removed feed %s for user %s", feedId, user));
      } else {
        LOG.info(String.format("No feed found with ID %s for user %s", feedId, user));
      }
    } finally {
      httpServletResponse.sendRedirect(PATH_FEED_ADMIN);
    }
  }

  private void handleLoginPost(
      Request request, HttpServletResponse httpServletResponse, boolean secured) throws Exception {
    String userId = request.getParameter(PARAM_USER_ID);
    String password = request.getParameter(PARAM_PASSWORD);
    String rememberAccountStr = request.getParameter(PARAM_REMEMBER_ACCOUNT);
    boolean rememberAccount = Boolean.parseBoolean(rememberAccountStr);
    LoginInfo.SessionInfo sessionInfo = UserHelpers.getSessionInfo(request);

    logOut(sessionInfo.browserId);

    User user = userDb.get(userId);
    if (user == null) {
      WebUtils.redirectToError("User " + userId + " not found", request, httpServletResponse);
      return;
    }

    if (!user.checkPassword(password)) {
      WebUtils.redirectToError("Invalid password", request, httpServletResponse);
      return;
    }

    if (!user.active) {
      WebUtils.redirectToError(
          "Account for User " + userId + " needs to be activated", request, httpServletResponse);
      return;
    }

    LOG.info("Logged in user " + userId);

    sessionInfo.sessionId = null;
    if (sessionInfo.browserId == null) {
      sessionInfo.browserId = getRandomId();
    } else {
      for (LoginInfo loginInfo : loginInfoDb.getLoginsForBrowser(sessionInfo.browserId)) {
        if (userId.equals(loginInfo.userId)) {
          sessionInfo.sessionId = loginInfo.sessionId;
          break;
        }
      }
    }

    long expireOn = System.currentTimeMillis() + Config.getConfig().loginExpireInterval;
    if (sessionInfo.sessionId == null) {
      sessionInfo.sessionId = getRandomId();
      Config config = Config.getConfig();
      loginInfoDb.add(
          new LoginInfo(
              sessionInfo.browserId,
              sessionInfo.sessionId,
              userId,
              expireOn,
              rememberAccount,
              config.defaultStyle,
              config.defaultItemsPerPage,
              config.defaultFeedDateFormat));
      LOG.info(String.format("Logging in in a new session. User: %s", user));
    } else {
      loginInfoDb.updateExpireTime(sessionInfo.browserId, sessionInfo.sessionId, expireOn);
      LOG.info(String.format("Logging in in an existing session. User: %s", user));
    }

    WebUtils.saveCookies(
        httpServletResponse, secured, sessionInfo.browserId, sessionInfo.sessionId);

    httpServletResponse.sendRedirect("/");
  }

  private String getRandomId() {
    SecureRandom secureRandom = new SecureRandom();
    return "" + secureRandom.nextLong();
  }

  private void addLoginParams(Request request, LoginInfo loginInfo) {
    MultiMap<String> params = new MultiMap<>();
    if (loginInfo != null && loginInfo.rememberAccount) {
      params.put(PARAM_USER_ID, loginInfo.userId);
    }
    request.setParameters(params);
  }

  private void logOut(String browserId) throws Exception {
    // ttt2 the right way to do it is to go through all the sessions of the current browser, which
    // would require a new field and a new index;
    // not sure if it's worth it, but this would work: A logs in, forgets to log out, B delets the
    // cookies, logs in, A sees B is logged in, then B
    // restores the cookies and uses A's account
    if (browserId == null) {
      return;
    }

    List<LoginInfo> loginInfos = loginInfoDb.getLoginsForBrowser(browserId);
    long expireTarget = System.currentTimeMillis() - Utils.ONE_DAY;
    for (LoginInfo loginInfo : loginInfos) {
      if (loginInfo.expiresOn <= expireTarget) {
        LOG.info(String.format("LoginInfo %s is enough in the past", loginInfo));
      } else {
        LOG.info(String.format("Logging out: %s", loginInfo));
        loginInfoDb.updateExpireTime(browserId, loginInfo.sessionId, expireTarget);
      }
    }
  }

  public static class FeedInfo {
    public String feedId;
    public int maxSeq;

    public FeedInfo(String feedId, int maxSeq) {
      this.feedId = feedId;
      this.maxSeq = maxSeq;
    }
  }

  // !!! IDEA reports this as unused, but it is called from JSP
  public static FeedInfo getFeedInfo(String feedPath) {
    if (feedPath.startsWith(PATH_FEED + "/")) {
      try {
        if (feedPath.endsWith("/")) {
          feedPath = feedPath.substring(0, feedPath.length() - 1);
        }
        int k = PATH_FEED.length() + 1;
        int p = feedPath.indexOf('/', k);
        return p >= 0
            ? new FeedInfo(feedPath.substring(k, p), Integer.parseInt(feedPath.substring(p + 1)))
            : new FeedInfo(feedPath.substring(k), -1);
      } catch (Exception e) {
        LOG.error("Exception trying to parse the feed info", e);
      }
    }

    LOG.error("Invalid path from feed: " + feedPath);
    return new FeedInfo("INVALID", -1);
  }

  // !!! IDEA reports this as unused, but it is called from JSP
  public static String getStyle(LoginInfo loginInfo) {
    StringBuilder bld = new StringBuilder();
    bld.append("<style media=\"screen\" type=\"text/css\">\n\n");
    if (loginInfo == null) {
      bld.append(Config.getConfig().defaultStyle);
    } else {
      bld.append(loginInfo.style); // ttt3 detect broken styles and return default
    }
    bld.append("</style>\n");
    return bld.toString();
  }

  /*    private void jspCodeCheck() throws Exception {
      Article.DB articleDb;
      Request request;
      String path = "";

      String feedId = ReaderHandler.getFeedId(path);
      int maxSeq = ReaderHandler.getSeq(path);

      Feed.DB feedDb = (Feed.DB)request.getAttribute(ReaderHandler.VAR_FEED_DB);

      Feed feed = feedDb.get(feedId);
      if (feed == null) {
          out.println("Feed " + feedId + " not found");
      } else {
          if (maxSeq == -1) {
              maxSeq = feed.maxSeq;
          }
          if (maxSeq < 0) {
              out.println("Feed " + feedId + " is empty");
          } else {
              ++maxSeq;
              LoginInfo loginInfo = (LoginInfo)request.getAttribute(ReaderHandler.VAR_LOGIN_INFO);
              int minSeq = Math.max(maxSeq - loginInfo.itemsPerPage, 0);
              List<Article> articles = articleDb.get(feedId, minSeq, maxSeq);
              for (Article article : articles) {
                  out.println("<a href=\"" + article.url + "\">" + article.title + "</a><br/>");
              }
          }
      }

  }
  //*/
}