1 package org.cacert.gigi.output;
3 import java.io.PrintWriter;
6 import javax.servlet.ServletRequest;
7 import javax.servlet.http.HttpServletRequest;
8 import javax.servlet.http.HttpSession;
10 import org.cacert.gigi.Language;
11 import org.cacert.gigi.pages.Page;
12 import org.cacert.gigi.util.RandomToken;
14 public abstract class Form implements Outputable {
15 public static final String CSRF_FIELD = "csrf";
18 public Form(HttpServletRequest hsr) {
19 csrf = RandomToken.generateToken(32);
20 HttpSession hs = hsr.getSession();
21 hs.setAttribute("form/" + getClass().getName() + "/" + csrf, this);
25 public abstract boolean submit(PrintWriter out, HttpServletRequest req);
28 public final void output(PrintWriter out, Language l, Map<String, Object> vars) {
29 out.println("<form method='POST' autocomplete='off'>");
30 outputContent(out, l, vars);
31 out.print("<input type='hidden' name='" + CSRF_FIELD + "' value='");
32 out.print(getCSRFToken());
33 out.println("'></form>");
36 protected abstract void outputContent(PrintWriter out, Language l, Map<String, Object> vars);
38 protected void outputError(PrintWriter out, ServletRequest req, String text) {
40 out.print(Page.translate(req, text));
41 out.println("</div>");
44 protected String getCSRFToken() {
48 protected void checkCSRF(HttpServletRequest req) {
49 if (!csrf.equals(req.getParameter(CSRF_FIELD))) {
50 throw new CSRFError();
54 public static <T extends Form> T getForm(HttpServletRequest req, Class<T> target) {
55 String csrf = req.getParameter(CSRF_FIELD);
57 throw new CSRFError();
59 HttpSession hs = req.getSession();
61 throw new CSRFError();
63 Form f = (Form) hs.getAttribute("form/" + target.getName() + "/" + csrf);
65 throw new CSRFError();
70 public static class CSRFError extends Error {