X-Git-Url: https://code.wpia.club/?p=gigi.git;a=blobdiff_plain;f=src%2Forg%2Fcacert%2Fgigi%2Foutput%2Ftemplate%2FForm.java;h=9e58a3cdf2fa44c9a2f3f360ade984c582f0a84d;hp=f330fe865a9e36e42ff874528338db347cdb1ea9;hb=17a15662212d973d12ed4cea3f5eaa9c0d1169ed;hpb=182e0bf4bc672b3e92cbcee950383a2ad8fef7fb

diff --git a/src/org/cacert/gigi/output/template/Form.java b/src/org/cacert/gigi/output/template/Form.java
index f330fe86..9e58a3cd 100644
--- a/src/org/cacert/gigi/output/template/Form.java
+++ b/src/org/cacert/gigi/output/template/Form.java
@@ -2,29 +2,61 @@ package org.cacert.gigi.output.template;
 
 import java.io.IOException;
 import java.io.PrintWriter;
+import java.util.HashMap;
 import java.util.Map;
 
-import javax.servlet.ServletRequest;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpSession;
 
 import org.cacert.gigi.GigiApiException;
 import org.cacert.gigi.localisation.Language;
+import org.cacert.gigi.pages.LoginPage;
 import org.cacert.gigi.pages.Page;
 import org.cacert.gigi.util.RandomToken;
 
+/**
+ * A generic HTML-form that handles CSRF-token creation.
+ */
 public abstract class Form implements Outputable {
 
+    public static class PermamentFormException extends RuntimeException {
+
+        public PermamentFormException(GigiApiException cause) {
+            super(cause);
+        }
+
+        @Override
+        public synchronized GigiApiException getCause() {
+            return (GigiApiException) super.getCause();
+        }
+    }
+
     public static final String CSRF_FIELD = "csrf";
 
+    private static final String SUBMIT_EXCEPTION = "form-submit-exception";
+
     private final String csrf;
 
     private final String action;
 
+    /**
+     * Creates a new {@link Form}.
+     * 
+     * @param hsr
+     *            the request to register the form against.
+     */
     public Form(HttpServletRequest hsr) {
         this(hsr, null);
     }
 
+    /**
+     * Creates a new {@link Form}.
+     * 
+     * @param hsr
+     *            the request to register the form against.
+     * @param action
+     *            the target path where the form should be submitted.
+     */
     public Form(HttpServletRequest hsr, String action) {
         csrf = RandomToken.generateToken(32);
         this.action = action;
@@ -32,7 +64,83 @@ public abstract class Form implements Outputable {
         hs.setAttribute("form/" + getClass().getName() + "/" + csrf, this);
     }
 
-    public abstract boolean submit(PrintWriter out, HttpServletRequest req) throws GigiApiException;
+    /**
+     * Update the forms internal state based on submitted data.
+     * 
+     * @param req
+     *            the request to take the initial data from.
+     * @return true, iff the form succeeded and the user should be redirected.
+     * @throws GigiApiException
+     *             if form data had problems or operations went wrong.
+     */
+    public abstract boolean submit(HttpServletRequest req) throws GigiApiException;
+
+    /**
+     * Calls {@link #submit(PrintWriter, HttpServletRequest)} while catching and
+     * displaying errors ({@link GigiApiException}), and re-outputing the form
+     * via {@link #output(PrintWriter, Language, Map)}.
+     * 
+     * @param out
+     *            the target to write the form and errors to
+     * @param req
+     *            the request that this submit originated (for submit and for
+     *            language)
+     * @return as {@link #submit(PrintWriter, HttpServletRequest)}: true, iff
+     *         the form succeeded and the user should be redirected.
+     */
+    public boolean submitProtected(PrintWriter out, HttpServletRequest req) {
+        try {
+            boolean succeeded = submit(req);
+            if (succeeded) {
+                HttpSession hs = req.getSession();
+                hs.removeAttribute("form/" + getClass().getName() + "/" + csrf);
+                return true;
+            }
+        } catch (GigiApiException e) {
+            e.format(out, LoginPage.getLanguage(req));
+        }
+        output(out, LoginPage.getLanguage(req), new HashMap<String, Object>());
+        return false;
+    }
+
+    public boolean submitExceptionProtected(HttpServletRequest req) {
+        try {
+            if (submit(req)) {
+                HttpSession hs = req.getSession();
+                hs.removeAttribute("form/" + getClass().getName() + "/" + csrf);
+                return true;
+            }
+            return false;
+        } catch (PermamentFormException e) {
+            req.setAttribute(SUBMIT_EXCEPTION, e);
+            return false;
+        } catch (GigiApiException e) {
+            req.setAttribute(SUBMIT_EXCEPTION, e);
+            return false;
+        }
+    }
+
+    /**
+     * Prints any errors in any form submits on this request.
+     * 
+     * @param req
+     *            The request to extract the errors from.
+     * @param out
+     *            the output stream to the user to write the errors to.
+     * @return true if no permanent errors occurred and the form should be
+     *         reprinted.
+     */
+    public static boolean printFormErrors(HttpServletRequest req, PrintWriter out) {
+        Object o = req.getAttribute(SUBMIT_EXCEPTION);
+        if (o != null && (o instanceof PermamentFormException)) {
+            ((PermamentFormException) o).getCause().format(out, Page.getLanguage(req));
+            return false;
+        }
+        if (o != null && (o instanceof GigiApiException)) {
+            ((GigiApiException) o).format(out, Page.getLanguage(req));
+        }
+        return true;
+    }
 
     protected String getCsrfFieldName() {
         return CSRF_FIELD;
@@ -45,52 +153,40 @@ public abstract class Form implements Outputable {
         } else {
             out.println("<form method='POST' action='" + action + "'>");
         }
-        failed = false;
         outputContent(out, l, vars);
         out.print("<input type='hidden' name='" + CSRF_FIELD + "' value='");
         out.print(getCSRFToken());
         out.println("'></form>");
     }
 
+    /**
+     * Outputs the forms contents.
+     * 
+     * @param out
+     *            Stream to the user.
+     * @param l
+     *            {@link Language} to translate text to.
+     * @param vars
+     *            Variables supplied from the outside.
+     */
     protected abstract void outputContent(PrintWriter out, Language l, Map<String, Object> vars);
 
-    boolean failed;
-
-    protected void outputError(PrintWriter out, ServletRequest req, String text, Object... contents) {
-        if ( !failed) {
-            failed = true;
-            out.println("<div class='formError'>");
-        }
-        out.print("<div>");
-        if (contents.length == 0) {
-            out.print(Page.translate(req, text));
-        } else {
-            out.print(String.format(Page.translate(req, text), contents));
-        }
-        out.println("</div>");
-    }
-
-    protected void outputErrorPlain(PrintWriter out, String text) {
-        if ( !failed) {
-            failed = true;
-            out.println("<div class='formError'>");
-        }
-        out.print("<div>");
-        out.print(text);
-        out.println("</div>");
-    }
-
-    public boolean isFailed(PrintWriter out) {
-        if (failed) {
-            out.println("</div>");
-        }
-        return failed;
-    }
-
     protected String getCSRFToken() {
         return csrf;
     }
 
+    /**
+     * Re-fetches a form e.g. when a Post-request is received.
+     * 
+     * @param req
+     *            the request that is directed to the form.
+     * @param target
+     *            the {@link Class} of the expected form.
+     * @return the form where this request is directed to.
+     * @throws CSRFException
+     *             if no CSRF-token is found or the token is wrong.
+     */
+    @SuppressWarnings("unchecked")
     public static <T extends Form> T getForm(HttpServletRequest req, Class<T> target) throws CSRFException {
         String csrf = req.getParameter(CSRF_FIELD);
         if (csrf == null) {
@@ -100,14 +196,23 @@ public abstract class Form implements Outputable {
         if (hs == null) {
             throw new CSRFException();
         }
-        Form f = (Form) hs.getAttribute("form/" + target.getName() + "/" + csrf);
+        Object f = hs.getAttribute("form/" + target.getName() + "/" + csrf);
         if (f == null) {
             throw new CSRFException();
         }
+        if ( !(f instanceof Form)) {
+            throw new CSRFException();
+        }
+        if ( !target.isInstance(f)) {
+            throw new CSRFException();
+        }
+        // Dynamic Cast checked by previous if statement
         return (T) f;
     }
 
     public static class CSRFException extends IOException {
 
+        private static final long serialVersionUID = 59708247477988362L;
+
     }
 }