1 package org.cacert.gigi.output.template;
3 import java.io.IOException;
4 import java.io.PrintWriter;
7 import javax.servlet.ServletRequest;
8 import javax.servlet.http.HttpServletRequest;
9 import javax.servlet.http.HttpSession;
11 import org.cacert.gigi.GigiApiException;
12 import org.cacert.gigi.localisation.Language;
13 import org.cacert.gigi.pages.Page;
14 import org.cacert.gigi.util.RandomToken;
16 public abstract class Form implements Outputable {
18 public static final String CSRF_FIELD = "csrf";
22 public Form(HttpServletRequest hsr) {
23 csrf = RandomToken.generateToken(32);
24 HttpSession hs = hsr.getSession();
25 hs.setAttribute("form/" + getClass().getName() + "/" + csrf, this);
29 public abstract boolean submit(PrintWriter out, HttpServletRequest req) throws GigiApiException;
31 protected String getCsrfFieldName() {
36 public void output(PrintWriter out, Language l, Map<String, Object> vars) {
37 out.println("<form method='POST'>");
39 outputContent(out, l, vars);
40 out.print("<input type='hidden' name='" + CSRF_FIELD + "' value='");
41 out.print(getCSRFToken());
42 out.println("'></form>");
45 protected abstract void outputContent(PrintWriter out, Language l, Map<String, Object> vars);
49 protected void outputError(PrintWriter out, ServletRequest req, String text, Object... contents) {
52 out.println("<div class='formError'>");
55 if (contents.length == 0) {
56 out.print(Page.translate(req, text));
58 out.print(String.format(Page.translate(req, text), contents));
60 out.println("</div>");
63 protected void outputErrorPlain(PrintWriter out, String text) {
66 out.println("<div class='formError'>");
70 out.println("</div>");
73 public boolean isFailed(PrintWriter out) {
75 out.println("</div>");
80 protected String getCSRFToken() {
84 public static <T extends Form> T getForm(HttpServletRequest req, Class<T> target) throws CSRFException {
85 String csrf = req.getParameter(CSRF_FIELD);
87 throw new CSRFException();
89 HttpSession hs = req.getSession();
91 throw new CSRFException();
93 Form f = (Form) hs.getAttribute("form/" + target.getName() + "/" + csrf);
95 throw new CSRFException();
100 public static class CSRFException extends IOException {