path: root/embed/mozilla/EphyBrowser.cpp

/*
 *  Copyright (C) 2000-2004 Marco Pesenti Gritti
 *  Copyright (C) 2003, 2004, 2005 Christian Persch
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 *  $Id$
 */

#include "mozilla-config.h"

#include "config.h"

#include "EphyBrowser.h"
#include "EphyUtils.h"
#include "EventContext.h"
#include "ephy-embed.h"
#include "ephy-string.h"
#include "ephy-zoom.h"
#include "ephy-debug.h"
#include "print-dialog.h"
#include "mozilla-embed.h"
#include "mozilla-embed-event.h"

#include <gtkmozembed_internal.h>
#include <unistd.h>

#include "nsIInterfaceRequestorUtils.h"
#include "nsIURI.h"
#include "nsISimpleEnumerator.h"

#include "nsIContentViewer.h"
#include "nsIWebBrowserFocus.h"
#include "nsICommandManager.h"
#include "nsIWebBrowserPrint.h"
#include "nsIDocCharset.h"
#include "nsIDocShellTreeItem.h"
#include "nsIDocShellTreeNode.h"
#include "nsIDocShellTreeOwner.h"
#include "nsIWebPageDescriptor.h"
#include "nsISHEntry.h"
#include "nsIHistoryEntry.h"
#include "nsIDOMHTMLDocument.h"
#include "nsIDOMHTMLCollection.h"
#include "nsIDOMHTMLElement.h"
#include "nsIDOMHTMLFormElement.h"
#include "nsIDOMHTMLInputElement.h"
#include "nsIDOMHTMLTextAreaElement.h"
#include "nsIDOMDocument.h"
#include "nsIDOM3Document.h"
#include "nsIDOMEvent.h"
#include "nsIDOMKeyEvent.h"
#include "nsIDOMMouseEvent.h"
#include "nsIDOMNSEvent.h"
#include "nsIDOMEventTarget.h"
#include "nsIDOMPopupBlockedEvent.h"
#include "nsIDOMNode.h"
#include "nsIDOMElement.h"
#include "nsIDOMWindow2.h"
#include "nsIDOMDocumentView.h"
#include "nsIDOMAbstractView.h"
#undef MOZILLA_INTERNAL_API
#include "nsEmbedString.h"
#define MOZILLA_INTERNAL_API 1
#include "nsMemory.h"
#include "nsIChannel.h"
#include "nsIScriptSecurityManager.h"
#include "nsIServiceManager.h"
#include "nsIInterfaceRequestor.h"
#include "nsIDOMHTMLDocument.h"
#include "nsIDOMXMLDocument.h"

#ifdef ALLOW_PRIVATE_API
#include "nsIImageDocument.h"
/* not frozen yet */
#include "nsIContentPolicy.h"
/* will never be frozen */
#include "nsIDocShell.h"
#include "nsIMarkupDocumentViewer.h"
#ifdef HAVE_MOZILLA_PSM
/* not sure about this one: */
#include <nsITransportSecurityInfo.h>
/* these are in pipnss/, are they really private? */
#include <nsISSLStatus.h>
#include <nsISSLStatusProvider.h>
#include <nsIX509Cert.h>
#include <nsICertificateDialogs.h>
#endif
#endif

const static PRUnichar kDOMLinkAdded[]       = { 'D', 'O', 'M', 'L', 'i', 'n', 'k', 'A', 'd', 'd', 'e', 'd', '\0' };
const static PRUnichar kDOMContentLoaded[]   = { 'D', 'O', 'M', 'C', 'o', 'n', 't', 'e', 'n', 't', 'L', 'o', 'a', 'd', 'e', 'd', '\0' };
const static PRUnichar kContextMenu[]        = { 'c', 'o', 'n', 't', 'e', 'x', 't', 'm', 'e', 'n', 'u', '\0' };
const static PRUnichar kDOMMouseScroll[]     = { 'D', 'O', 'M', 'M', 'o', 'u', 's', 'e', 'S', 'c', 'r', 'o', 'l', 'l', '\0' };
const static PRUnichar kDOMPopupBlocked[]    = { 'D', 'O', 'M', 'P', 'o', 'p', 'u', 'p', 'B', 'l', 'o', 'c', 'k', 'e', 'd', '\0' };
const static PRUnichar kDOMWillOpenModalDialog[] = { 'D', 'O', 'M', 'W', 'i', 'l', 'l', 'O', 'p', 'e', 'n', 'M', 'o', 'd', 'a', 'l', 'D', 'i', 'a', 'l', 'o', 'g', '\0' };
const static PRUnichar kDOMModalDialogClosed[]   = { 'D', 'O', 'M', 'M', 'o', 'd', 'a', 'l', 'D', 'i', 'a', 'l', 'o', 'g', 'C', 'l', 'o', 's', 'e', 'd', '\0' };
const static PRUnichar kHrefAttr[]       = { 'h', 'r', 'e', 'f', '\0' };
const static PRUnichar kTypeAttr[]       = { 't', 'y', 'p', 'e', '\0' };
const static PRUnichar kTitleAttr[]      = { 't', 'i', 't', 'l', 'e', '\0' };
const static PRUnichar kRelAttr[]        = { 'r', 'e', 'l', '\0' };

NS_IMPL_ISUPPORTS1(EphyEventListener, nsIDOMEventListener)

NS_IMETHODIMP
EphyDOMLinkEventListener::HandleEvent (nsIDOMEvent* aDOMEvent)
{
    /* make sure the event is trusted */
    nsCOMPtr<nsIDOMNSEvent> nsEvent (do_QueryInterface (aDOMEvent));
    NS_ENSURE_TRUE (nsEvent, NS_ERROR_FAILURE);
    PRBool isTrusted = PR_FALSE;
    nsEvent->GetIsTrusted (&isTrusted);
    if (!isTrusted) return NS_OK;

    nsCOMPtr<nsIDOMEventTarget> eventTarget;
    aDOMEvent->GetTarget(getter_AddRefs(eventTarget));

    nsCOMPtr<nsIDOMElement> linkElement (do_QueryInterface (eventTarget));
    if (!linkElement) return NS_ERROR_FAILURE;

    nsresult rv;
    nsEmbedString value;
    rv = linkElement->GetAttribute (nsEmbedString(kRelAttr), value);
    if (NS_FAILED (rv)) return NS_ERROR_FAILURE;

    nsEmbedCString rel;
    NS_UTF16ToCString (value, NS_CSTRING_ENCODING_UTF8, rel);   

    if (g_ascii_strcasecmp (rel.get(), "SHORTCUT ICON") == 0 ||
        g_ascii_strcasecmp (rel.get(), "ICON") == 0)
    {
        nsCOMPtr<nsIDOMDocument> domDoc;
        linkElement->GetOwnerDocument(getter_AddRefs(domDoc));
        NS_ENSURE_TRUE (domDoc, NS_ERROR_FAILURE);

        nsCOMPtr<nsIDOMDocumentView> docView (do_QueryInterface (domDoc));
        NS_ENSURE_TRUE (docView, NS_ERROR_FAILURE);

        nsCOMPtr<nsIDOMAbstractView> abstractView;
        docView->GetDefaultView (getter_AddRefs (abstractView));

        nsCOMPtr<nsIDOMWindow> domWin (do_QueryInterface (abstractView));
        NS_ENSURE_TRUE (domWin, NS_ERROR_FAILURE);

        nsCOMPtr<nsIDOMWindow> topDomWin;
        domWin->GetTop (getter_AddRefs (topDomWin));

        nsCOMPtr<nsISupports> domWinAsISupports (do_QueryInterface (domWin));
        nsCOMPtr<nsISupports> topDomWinAsISupports (do_QueryInterface (topDomWin));
        /* disallow subframes to set favicon */
        if (domWinAsISupports != topDomWinAsISupports) return NS_OK;

        nsCOMPtr<nsIURI> docUri;
        rv = GetDocURI (linkElement, getter_AddRefs (docUri));
        NS_ENSURE_TRUE (NS_SUCCEEDED (rv) && docUri, NS_ERROR_FAILURE);

        rv = linkElement->GetAttribute (nsEmbedString (kHrefAttr), value);
        if (NS_FAILED (rv) || !value.Length()) return NS_ERROR_FAILURE;

        nsEmbedCString cLink;
        NS_UTF16ToCString (value, NS_CSTRING_ENCODING_UTF8, cLink);

        nsEmbedCString faviconUrl;
        rv = docUri->Resolve (cLink, faviconUrl);
        NS_ENSURE_SUCCESS (rv, NS_ERROR_FAILURE);

        nsCOMPtr<nsIURI> favUri;
        EphyUtils::NewURI (getter_AddRefs (favUri), faviconUrl);
        NS_ENSURE_TRUE (favUri, NS_ERROR_FAILURE);

        /* check if load is allowed */
        nsCOMPtr<nsIScriptSecurityManager> secMan
            (do_GetService("@mozilla.org/scriptsecuritymanager;1"));
        /* refuse if we can't check */
        NS_ENSURE_TRUE (secMan, NS_OK);

        rv = secMan->CheckLoadURI(docUri, favUri,
                      nsIScriptSecurityManager::STANDARD);
        /* failure means it didn't pass the security check */
        if (NS_FAILED (rv)) return NS_OK;

        /* security check passed, now check with content policy */
        nsCOMPtr<nsIContentPolicy> policy =
            do_GetService("@mozilla.org/layout/content-policy;1");
        /* refuse if we can't check */
        NS_ENSURE_TRUE (policy, NS_OK);

#if MOZ_NSICONTENTPOLICY_VARIANT == 2
        linkElement->GetAttribute (nsEmbedString (kTypeAttr), value);

        nsEmbedCString cTypeVal;
        NS_UTF16ToCString (value, NS_CSTRING_ENCODING_UTF8, cTypeVal);

        PRInt16 decision = 0;
        rv = policy->ShouldLoad (nsIContentPolicy::TYPE_IMAGE,
                     favUri, docUri, eventTarget,
                     cTypeVal, nsnull,
                     &decision);
        NS_ENSURE_SUCCESS (rv, NS_ERROR_FAILURE);
        if (decision != nsIContentPolicy::ACCEPT) return NS_OK;
#else
        PRBool shouldLoad = PR_FALSE;
        rv = policy->ShouldLoad (nsIContentPolicy::IMAGE,
                     favUri, eventTarget,
                     domWin,
                     &shouldLoad);
        NS_ENSURE_SUCCESS (rv, NS_ERROR_FAILURE);
        if (!shouldLoad) return NS_OK;
#endif

        /* Hide password part */
        favUri->SetPassword (nsEmbedCString ());

        nsEmbedCString spec;
        favUri->GetSpec (spec);

        /* ok, we accept this as a valid favicon for this site */
        g_signal_emit_by_name (mOwner->mEmbed, "ge_favicon", spec.get());
    }
    else if (g_ascii_strcasecmp (rel.get (), "alternate") == 0)
    {
        linkElement->GetAttribute (nsEmbedString (kTypeAttr), value);

        nsEmbedCString cTypeVal;
        NS_UTF16ToCString (value, NS_CSTRING_ENCODING_UTF8, cTypeVal);

        if (g_ascii_strcasecmp (cTypeVal.get (), "application/rss+xml") == 0 ||
            g_ascii_strcasecmp (cTypeVal.get (), "application/atom+xml") == 0)
        {
            rv = linkElement->GetAttribute (nsEmbedString (kHrefAttr), value);
            if (NS_FAILED (rv) || !value.Length()) return NS_ERROR_FAILURE;

            nsEmbedCString cLink;
            NS_UTF16ToCString (value, NS_CSTRING_ENCODING_UTF8, cLink);

            nsCOMPtr<nsIURI> docUri;
            rv = GetDocURI (linkElement, getter_AddRefs (docUri));
            NS_ENSURE_TRUE (NS_SUCCEEDED (rv) && docUri, NS_ERROR_FAILURE);

            /* Hide password part */
            docUri->SetPassword (nsEmbedCString ());

            nsEmbedCString resolvedLink;
            rv = docUri->Resolve (cLink, resolvedLink);
            NS_ENSURE_SUCCESS (rv, NS_ERROR_FAILURE);

            linkElement->GetAttribute (nsEmbedString (kTitleAttr), value);

            nsEmbedCString cTitle;
            NS_UTF16ToCString (value, NS_CSTRING_ENCODING_UTF8, cTitle);

            g_signal_emit_by_name (mOwner->mEmbed, "ge_feed_link",
                           cTypeVal.get(), cTitle.get(), resolvedLink.get());
        }
    }

    return NS_OK;
}

NS_IMETHODIMP
EphyDOMContentLoadedEventListener::HandleEvent (nsIDOMEvent* aDOMEvent)
{
    LOG ("DOMContentLoaded event fired up");

    /* make sure the event is trusted */
    nsCOMPtr<nsIDOMNSEvent> nsEvent (do_QueryInterface (aDOMEvent));
    NS_ENSURE_TRUE (nsEvent, NS_ERROR_FAILURE);
    PRBool isTrusted = PR_FALSE;
    nsEvent->GetIsTrusted (&isTrusted);
    if (!isTrusted) return NS_OK;

    g_signal_emit_by_name (mOwner->mEmbed, "dom_content_loaded", (gpointer)aDOMEvent);

    return NS_OK;
}

nsresult
EphyDOMLinkEventListener::GetDocURI (nsIDOMElement *aElement,
                     nsIURI **aDocURI)
{
    nsCOMPtr<nsIDOMDocument> domDoc;
    aElement->GetOwnerDocument (getter_AddRefs(domDoc));

    nsCOMPtr<nsIDOM3Document> doc (do_QueryInterface (domDoc));
    NS_ENSURE_TRUE (doc, NS_ERROR_FAILURE);

    nsresult rv;
    nsEmbedString spec;
    rv = doc->GetDocumentURI (spec);
    NS_ENSURE_SUCCESS (rv, rv);

    nsEmbedCString encoding;
    rv = mOwner->GetEncoding (encoding);
    NS_ENSURE_SUCCESS (rv, rv);

    return EphyUtils::NewURI (aDocURI, spec, encoding.get());
}

NS_IMETHODIMP
EphyPopupBlockEventListener::HandleEvent (nsIDOMEvent * aDOMEvent)
{
    /* make sure the event is trusted */
    nsCOMPtr<nsIDOMNSEvent> nsEvent (do_QueryInterface (aDOMEvent));
    NS_ENSURE_TRUE (nsEvent, NS_ERROR_FAILURE);
    PRBool isTrusted = PR_FALSE;
    nsEvent->GetIsTrusted (&isTrusted);
    if (!isTrusted) return NS_OK;

    nsCOMPtr<nsIDOMPopupBlockedEvent> popupEvent =
        do_QueryInterface (aDOMEvent);
    NS_ENSURE_TRUE (popupEvent, NS_ERROR_FAILURE);

    nsCOMPtr<nsIURI> popupWindowURI;
    popupEvent->GetPopupWindowURI (getter_AddRefs (popupWindowURI));
    NS_ENSURE_TRUE (popupWindowURI, NS_ERROR_FAILURE);

    nsresult rv;
    nsEmbedCString popupWindowURIString;
    rv = popupWindowURI->GetSpec (popupWindowURIString);
    NS_ENSURE_SUCCESS (rv, NS_ERROR_FAILURE);

    nsEmbedString popupWindowFeatures;
    rv = popupEvent->GetPopupWindowFeatures (popupWindowFeatures);
    NS_ENSURE_SUCCESS (rv, NS_ERROR_FAILURE);

    nsEmbedCString popupWindowFeaturesString;
    NS_UTF16ToCString (popupWindowFeatures,
               NS_CSTRING_ENCODING_UTF8,
               popupWindowFeaturesString);

    g_signal_emit_by_name(mOwner->mEmbed, "ge_popup_blocked",
                  popupWindowURIString.get(),
                  popupWindowFeaturesString.get());

    return NS_OK;
}

NS_IMETHODIMP
EphyModalAlertEventListener::HandleEvent (nsIDOMEvent * aDOMEvent)
{
    NS_ENSURE_TRUE (mOwner, NS_ERROR_FAILURE);

    /* make sure the event is trusted */
    nsCOMPtr<nsIDOMNSEvent> nsEvent (do_QueryInterface (aDOMEvent));
    NS_ENSURE_TRUE (nsEvent, NS_ERROR_FAILURE);
    PRBool isTrusted = PR_FALSE;
    nsEvent->GetIsTrusted (&isTrusted);
    if (!isTrusted) return NS_OK;

    nsresult rv;
    nsEmbedString type;
    rv = aDOMEvent->GetType (type);
    NS_ENSURE_SUCCESS (rv, rv);

    nsEmbedCString cType;
    NS_UTF16ToCString (type, NS_CSTRING_ENCODING_UTF8, cType);

    LOG ("ModalAlertListener event %s", cType.get());

    if (strcmp (cType.get(), "DOMWillOpenModalDialog") == 0)
    {
        gboolean retval = FALSE;
        g_signal_emit_by_name (mOwner->mEmbed, "ge-modal-alert", &retval);

        /* suppress alert */
        if (retval)
        {
            aDOMEvent->PreventDefault ();
            aDOMEvent->StopPropagation();
        }
    }
    else if (strcmp (cType.get(), "DOMModalDialogClosed") == 0)
    {
        g_signal_emit_by_name (mOwner->mEmbed, "ge-modal-alert-closed");
    }

    return NS_OK;
}

NS_IMETHODIMP
EphyDOMScrollEventListener::HandleEvent (nsIDOMEvent * aEvent)
{
    /* make sure the event is trusted */
    nsresult rv;
    nsCOMPtr<nsIDOMNSEvent> nsEvent (do_QueryInterface (aEvent, &rv));
    NS_ENSURE_SUCCESS (rv, rv);
    PRBool isTrusted = PR_FALSE;
    nsEvent->GetIsTrusted (&isTrusted);
    if (!isTrusted) return NS_OK;

    nsCOMPtr<nsIDOMMouseEvent> mouseEvent (do_QueryInterface (aEvent, &rv));
    NS_ENSURE_SUCCESS (rv, rv);
        
    PRBool isAlt = PR_FALSE, isControl = PR_FALSE, isShift = PR_FALSE;
    mouseEvent->GetAltKey (&isAlt);
    mouseEvent->GetCtrlKey (&isControl);
    mouseEvent->GetShiftKey (&isShift);
    /* GetMetaKey is always false on gtk2 mozilla */

    if (isControl && !isAlt && !isShift)
    {
        PRInt32 detail = 0;
        mouseEvent->GetDetail(&detail);

        float zoom, new_zoom;
        rv = mOwner->GetZoom (&zoom);
        NS_ENSURE_SUCCESS (rv, rv);

        zoom = ephy_zoom_get_changed_zoom_level (zoom, detail > 0 ? 1 : detail < 0 ? -1 : 0);
        rv = mOwner->SetZoom (zoom);
        if (NS_SUCCEEDED (rv))
        {
            g_signal_emit_by_name (mOwner->mEmbed, "ge_zoom_change", zoom);
        }

        /* we consumed the event */
        aEvent->PreventDefault();    
    }
     
    return NS_OK;
}

NS_IMPL_ISUPPORTS1(EphyContextMenuListener, nsIDOMContextMenuListener)

NS_IMETHODIMP
EphyContextMenuListener::ContextMenu (nsIDOMEvent* aDOMEvent)
{
    nsCOMPtr<nsIDOMMouseEvent> mouseEvent = do_QueryInterface(aDOMEvent);
    NS_ENSURE_TRUE (mouseEvent, NS_ERROR_FAILURE);

    MozillaEmbedEvent *info;
    info = mozilla_embed_event_new (NS_STATIC_CAST (gpointer, aDOMEvent));

    nsresult rv;
    EventContext context;
    context.Init (mOwner);
        rv = context.GetMouseEventInfo (mouseEvent, MOZILLA_EMBED_EVENT (info));

    /* Don't do any magic handling if we can't actually show the context
     * menu, this can happen for XUL pages (e.g. about:config)
     */
    if (NS_FAILED (rv))
    {
        g_object_unref (info);
        return NS_OK;   
    }

    if (info->button == 0)
    {
        /* Translate relative coordinates to absolute values, and try
         * to avoid covering links by adding a little offset
         */
        int x, y;
        gdk_window_get_origin (GTK_WIDGET (mOwner->mEmbed)->window, &x, &y);
        info->x += x + 6;       
        info->y += y + 6;

        // Set the keycode to something sensible
        info->keycode = nsIDOMKeyEvent::DOM_VK_CONTEXT_MENU;
    }

    if (info->modifier == GDK_CONTROL_MASK)
    {
        info->context = EPHY_EMBED_CONTEXT_DOCUMENT;
    }

    gboolean retval = FALSE;
    nsCOMPtr<nsIDOMDocument> domDoc;
    rv = context.GetTargetDocument (getter_AddRefs(domDoc));
    if (NS_SUCCEEDED(rv))
    {
        mOwner->PushTargetDocument (domDoc);

        g_signal_emit_by_name (mOwner->mEmbed, "ge_context_menu",
                       info, &retval);

        mOwner->PopTargetDocument ();
    }

    /* We handled the event, block javascript calls */
    if (retval)
    {
        aDOMEvent->PreventDefault();
        aDOMEvent->StopPropagation();
    }
    
    g_object_unref (info);

    return NS_OK;
}

NS_IMETHODIMP
EphyContextMenuListener::HandleEvent (nsIDOMEvent* aDOMEvent)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

EphyBrowser::EphyBrowser ()
: mDOMLinkEventListener(nsnull)
, mDOMContentLoadedEventListener(nsnull)
, mDOMScrollEventListener(nsnull)
, mPopupBlockEventListener(nsnull)
, mModalAlertListener(nsnull)
, mContextMenuListener(nsnull)
, mInitialized(PR_FALSE)
{
    LOG ("EphyBrowser ctor (%p)", this);
}

EphyBrowser::~EphyBrowser ()
{
    LOG ("EphyBrowser dtor (%p)", this);
}

nsresult EphyBrowser::Init (GtkMozEmbed *mozembed)
{
    if (mInitialized) return NS_OK;

    mEmbed = GTK_WIDGET (mozembed);

    gtk_moz_embed_get_nsIWebBrowser (mozembed,
                     getter_AddRefs(mWebBrowser));
    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    mWebBrowser->GetContentDOMWindow (getter_AddRefs (mDOMWindow));
    NS_ENSURE_TRUE (mDOMWindow, NS_ERROR_FAILURE);

    /* This will instantiate an about:blank doc if necessary */
    nsresult rv;
    nsCOMPtr<nsIDOMDocument> domDocument;
    rv = mDOMWindow->GetDocument (getter_AddRefs (domDocument));
    NS_ENSURE_SUCCESS (rv, NS_ERROR_FAILURE);

    mDOMLinkEventListener = new EphyDOMLinkEventListener(this);
    if (!mDOMLinkEventListener) return NS_ERROR_OUT_OF_MEMORY;

    mDOMContentLoadedEventListener = new EphyDOMContentLoadedEventListener(this);
    if (!mDOMContentLoadedEventListener) return NS_ERROR_OUT_OF_MEMORY;

    mDOMScrollEventListener = new EphyDOMScrollEventListener(this);
    if (!mDOMScrollEventListener) return NS_ERROR_OUT_OF_MEMORY;

    mPopupBlockEventListener = new EphyPopupBlockEventListener(this);
    if (!mPopupBlockEventListener) return NS_ERROR_OUT_OF_MEMORY;

    mModalAlertListener = new EphyModalAlertEventListener (this);
    if (!mModalAlertListener) return NS_ERROR_OUT_OF_MEMORY;

    mContextMenuListener = new EphyContextMenuListener(this);
    if (!mContextMenuListener) return NS_ERROR_OUT_OF_MEMORY;

    rv = GetListener();
    NS_ENSURE_SUCCESS (rv, NS_ERROR_FAILURE);

    rv = AttachListeners();
    NS_ENSURE_SUCCESS (rv, NS_ERROR_FAILURE);

#ifdef HAVE_MOZILLA_PSM
#ifdef HAVE_GECKO_1_8
    nsCOMPtr<nsIDocShell> docShell (do_GetInterface (mWebBrowser, &rv));
    NS_ENSURE_SUCCESS (rv, rv);

    rv = docShell->GetSecurityUI (getter_AddRefs (mSecurityInfo));
    NS_ENSURE_SUCCESS (rv, rv);
#else
    /* FIXME: mozilla sucks! nsWebBrowser already has an instance of this,
     * but we cannot get to it!
     * See https://bugzilla.mozilla.org/show_bug.cgi?id=94974
     */
    /* First try GI */
    mSecurityInfo = do_GetInterface (mWebBrowser);
    /* Try to instantiate it under the re-registered contract ID */
    if (!mSecurityInfo)
    {
        /* This will cause all security warning dialogs to be shown
         * twice (once by this instance, and another time by nsWebBrowser's
         * instance of nsSecurityBrowserUIImpl), but there appears to be
         * no other way :-(
         */
        mSecurityInfo = do_CreateInstance("@gnome.org/project/epiphany/hacks/secure-browser-ui;1", &rv);
        if (NS_SUCCEEDED (rv) && mSecurityInfo)
        {
            rv = mSecurityInfo->Init (mDOMWindow);
            NS_ENSURE_SUCCESS (rv, rv);
        }
    }
    /* Try the original contract ID */
    if (!mSecurityInfo)
    {
        /* This will cause all security warning dialogs to be shown
         * twice (once by this instance, and another time by nsWebBrowser's
         * instance of nsSecurityBrowserUIImpl), but there appears to be
         * no other way :-(
         */
        mSecurityInfo = do_CreateInstance(NS_SECURE_BROWSER_UI_CONTRACTID, &rv);
        if (NS_SUCCEEDED (rv) && mSecurityInfo)
        {
            rv = mSecurityInfo->Init (mDOMWindow);
            NS_ENSURE_SUCCESS (rv, rv);
        }
    }
#endif /* HAVE_GECKO_1_8 */
    if (!mSecurityInfo)
    {
        g_warning ("Failed to get nsISecureBrowserUI!\n");
    }
#endif /* HAVE_MOZILLA_PSM */

    mInitialized = PR_TRUE;

    return NS_OK;
}

nsresult
EphyBrowser::GetListener (void)
{
    if (mEventTarget) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIDOMWindow> domWindowExternal;
    mWebBrowser->GetContentDOMWindow (getter_AddRefs(domWindowExternal));
  
    nsCOMPtr<nsIDOMWindow2> domWindow (do_QueryInterface (domWindowExternal));
    NS_ENSURE_TRUE (domWindow, NS_ERROR_FAILURE);
    
    domWindow->GetWindowRoot (getter_AddRefs(mEventTarget));
    NS_ENSURE_TRUE (mEventTarget, NS_ERROR_FAILURE);

    return NS_OK;
}

nsresult
EphyBrowser::AttachListeners(void)
{
    NS_ENSURE_TRUE (mEventTarget, NS_ERROR_FAILURE);

    nsresult rv;
    rv = mEventTarget->AddEventListener(nsEmbedString(kDOMLinkAdded),
                        mDOMLinkEventListener, PR_FALSE);
    rv |= mEventTarget->AddEventListener(nsEmbedString(kDOMContentLoaded),
                         mDOMContentLoadedEventListener, PR_FALSE);
    rv |= mEventTarget->AddEventListener(nsEmbedString(kDOMMouseScroll),
                         mDOMScrollEventListener, PR_TRUE); /* capture */
    rv |= mEventTarget->AddEventListener(nsEmbedString(kDOMPopupBlocked),
                         mPopupBlockEventListener, PR_FALSE);
    rv |= mEventTarget->AddEventListener(nsEmbedString(kDOMWillOpenModalDialog),
                         mModalAlertListener, PR_TRUE);
    rv |= mEventTarget->AddEventListener(nsEmbedString(kDOMMouseScroll),
                         mDOMScrollEventListener, PR_TRUE);
    rv |= mEventTarget->AddEventListener(nsEmbedString(kDOMModalDialogClosed),
                         mModalAlertListener, PR_TRUE);
    rv |= mEventTarget->AddEventListener(nsEmbedString(kContextMenu),
                         mContextMenuListener, PR_TRUE /* capture */);
    NS_ENSURE_SUCCESS (rv, NS_ERROR_FAILURE);

    return NS_OK;
}

nsresult
EphyBrowser::DetachListeners(void)
{
    if (!mEventTarget) return NS_OK;

    nsresult rv;
    rv = mEventTarget->RemoveEventListener(nsEmbedString(kDOMLinkAdded),
                           mDOMLinkEventListener, PR_FALSE);
    rv |= mEventTarget->RemoveEventListener(nsEmbedString(kDOMContentLoaded),
                            mDOMContentLoadedEventListener, PR_FALSE);
    rv |= mEventTarget->RemoveEventListener(nsEmbedString(kDOMMouseScroll),
                        mDOMScrollEventListener, PR_TRUE); /* capture */
    rv |= mEventTarget->RemoveEventListener(nsEmbedString(kDOMPopupBlocked),
                            mPopupBlockEventListener, PR_FALSE);
    rv |= mEventTarget->RemoveEventListener(nsEmbedString(kDOMWillOpenModalDialog),
                        mModalAlertListener, PR_TRUE);
    rv |= mEventTarget->RemoveEventListener(nsEmbedString(kDOMModalDialogClosed),
                        mModalAlertListener, PR_TRUE);
    rv |= mEventTarget->RemoveEventListener(nsEmbedString(kContextMenu),
                            mContextMenuListener, PR_TRUE /* capture */);
    NS_ENSURE_SUCCESS (rv, NS_ERROR_FAILURE);

    return NS_OK;
}

nsresult EphyBrowser::Print ()
{
    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    nsCOMPtr<nsIWebBrowserPrint> print(do_GetInterface(mWebBrowser));
    NS_ENSURE_TRUE (print, NS_ERROR_FAILURE);

    return  print->Print (nsnull, nsnull);
}

nsresult EphyBrowser::SetPrintPreviewMode (PRBool previewMode)
{
    nsresult rv;

    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    nsCOMPtr<nsIWebBrowserPrint> print(do_GetInterface(mWebBrowser));
    NS_ENSURE_TRUE (print, NS_ERROR_FAILURE);

    if (previewMode)
    {
        EmbedPrintInfo *info;

        nsCOMPtr<nsIPrintSettings> settings;
        print->GetGlobalPrintSettings (getter_AddRefs(settings));

        info = ephy_print_get_print_info ();
        EphyUtils::CollatePrintSettings (info, settings, TRUE);
        ephy_print_info_free (info);

        rv = print->PrintPreview (nsnull, mDOMWindow, nsnull);
    }
    else
    {
        PRBool isPreview = PR_FALSE;

        rv = print->GetDoingPrintPreview(&isPreview);
        NS_ENSURE_SUCCESS (rv, NS_ERROR_FAILURE);

        if (isPreview == PR_TRUE)
        {
            rv = print->ExitPrintPreview();
        }
    }

    return rv;
}

nsresult EphyBrowser::PrintPreviewNumPages (int *numPages)
{
    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    nsCOMPtr<nsIWebBrowserPrint> print(do_GetInterface(mWebBrowser));
    NS_ENSURE_TRUE (print, NS_ERROR_FAILURE);

    return print->GetPrintPreviewNumPages(numPages);
}

nsresult EphyBrowser::PrintPreviewNavigate(PRInt16 navType, PRInt32 pageNum)
{
    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    nsCOMPtr<nsIWebBrowserPrint> print(do_GetInterface(mWebBrowser));
    NS_ENSURE_TRUE (print, NS_ERROR_FAILURE);

    return print->PrintPreviewNavigate(navType, pageNum);
}

nsresult EphyBrowser::GetSHistory (nsISHistory **aSHistory)
{
    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    nsCOMPtr<nsIWebNavigation> ContentNav = do_QueryInterface (mWebBrowser);
    NS_ENSURE_TRUE (ContentNav, NS_ERROR_FAILURE);

    nsCOMPtr<nsISHistory> SessionHistory;
    ContentNav->GetSessionHistory (getter_AddRefs (SessionHistory));
    NS_ENSURE_TRUE (SessionHistory, NS_ERROR_FAILURE);

    *aSHistory = SessionHistory.get();
    NS_IF_ADDREF (*aSHistory);

    return NS_OK;
}

nsresult EphyBrowser::Destroy ()
{
    DetachListeners ();

        mWebBrowser = nsnull;
    mDOMWindow = nsnull;
    mEventTarget = nsnull;
    mEmbed = nsnull;

    mInitialized = PR_FALSE;

    return NS_OK;
}

nsresult EphyBrowser::GoToHistoryIndex (PRInt16 index)
{
    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    nsCOMPtr<nsIWebNavigation> ContentNav = do_QueryInterface (mWebBrowser);
    NS_ENSURE_TRUE (ContentNav, NS_ERROR_FAILURE);

    return ContentNav->GotoIndex (index);
}

#ifndef HAVE_GECKO_1_8
/* Workaround for broken reload with frames, see mozilla bug
 * http://bugzilla.mozilla.org/show_bug.cgi?id=246392
 */
nsresult EphyBrowser::Reload (ReloadType flags)
{
    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    nsCOMPtr<nsISHistory> sessionHistory;
    GetSHistory (getter_AddRefs (sessionHistory));

    nsCOMPtr<nsIWebNavigation> webNavigation;
    webNavigation = do_QueryInterface (sessionHistory);

    if (!webNavigation)
    {
        webNavigation = do_QueryInterface (mWebBrowser);
    }
    NS_ENSURE_TRUE (webNavigation, NS_ERROR_FAILURE);

    PRUint32 reloadFlags;
    switch (flags)
    {
        case RELOAD_FORCE:
            reloadFlags = nsIWebNavigation::LOAD_FLAGS_BYPASS_CACHE | 
                      nsIWebNavigation::LOAD_FLAGS_BYPASS_PROXY;
            break;
        case RELOAD_ENCODING_CHANGE:
            reloadFlags = nsIWebNavigation::LOAD_FLAGS_CHARSET_CHANGE;
            break;
        case RELOAD_NORMAL:
        default:
            reloadFlags = 0;
            break;
    }

    return webNavigation->Reload (reloadFlags);
}
#endif /* !HAVE_GECKO_1_8 */

nsresult EphyBrowser::SetZoom (float aZoom)
{
    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    nsCOMPtr<nsIContentViewer> contentViewer;   
    GetContentViewer (getter_AddRefs(contentViewer));
    NS_ENSURE_TRUE (contentViewer, NS_ERROR_FAILURE);

    nsCOMPtr<nsIMarkupDocumentViewer> mdv = do_QueryInterface(contentViewer);
    NS_ENSURE_TRUE (mdv, NS_ERROR_FAILURE);

    return mdv->SetTextZoom (aZoom);
}

nsresult EphyBrowser::GetContentViewer (nsIContentViewer **aViewer)
{
    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    nsCOMPtr<nsIDocShell> ourDocShell(do_GetInterface(mWebBrowser));
    NS_ENSURE_TRUE (ourDocShell, NS_ERROR_FAILURE);

    return ourDocShell->GetContentViewer(aViewer);
}

nsresult EphyBrowser::GetZoom (float *aZoom)
{
    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    nsCOMPtr<nsIContentViewer> contentViewer;   
    GetContentViewer (getter_AddRefs(contentViewer));
    NS_ENSURE_TRUE (contentViewer, NS_ERROR_FAILURE);

    nsCOMPtr<nsIMarkupDocumentViewer> mdv = do_QueryInterface(contentViewer);
    NS_ENSURE_TRUE (mdv, NS_ERROR_FAILURE);

    return mdv->GetTextZoom (aZoom);
}

nsresult EphyBrowser::GetDocument (nsIDOMDocument **aDOMDocument)
{
    return mDOMWindow->GetDocument (aDOMDocument);
}

nsresult EphyBrowser::GetTargetDocument (nsIDOMDocument **aDOMDocument)
{
    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    /* Use the current target document */
    if (mTargetDocument)
    {
        *aDOMDocument = mTargetDocument.get();

        NS_IF_ADDREF(*aDOMDocument);

        return NS_OK;
    }

    /* Use the focused document */
    nsCOMPtr<nsIWebBrowserFocus> webBrowserFocus;
    webBrowserFocus = do_QueryInterface (mWebBrowser);
    NS_ENSURE_TRUE (webBrowserFocus, NS_ERROR_FAILURE);

    nsresult rv;
    nsCOMPtr<nsIDOMWindow> DOMWindow;
    rv = webBrowserFocus->GetFocusedWindow (getter_AddRefs(DOMWindow));
    if (NS_SUCCEEDED (rv) && DOMWindow)
    {
        return DOMWindow->GetDocument (aDOMDocument);
    }

    /* Use the main document */
    return mDOMWindow->GetDocument (aDOMDocument);
}

nsresult EphyBrowser::GetSHInfo (PRInt32 *count, PRInt32 *index)
{
    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    nsCOMPtr<nsISHistory> SessionHistory;
    GetSHistory (getter_AddRefs(SessionHistory));
    NS_ENSURE_TRUE (SessionHistory, NS_ERROR_FAILURE);

    SessionHistory->GetCount (count);
    SessionHistory->GetIndex (index);   

    return NS_OK;
}

nsresult EphyBrowser::GetSHTitleAtIndex (PRInt32 index, PRUnichar **title)
{
    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    nsCOMPtr<nsISHistory> SessionHistory;
    GetSHistory (getter_AddRefs(SessionHistory));
    NS_ENSURE_TRUE (SessionHistory, NS_ERROR_FAILURE);

    nsCOMPtr<nsIHistoryEntry> he;
    SessionHistory->GetEntryAtIndex (index, PR_FALSE,
                     getter_AddRefs (he));
    NS_ENSURE_TRUE (he, NS_ERROR_FAILURE);

    nsresult rv;
    rv = he->GetTitle (title);
    NS_ENSURE_TRUE (NS_SUCCEEDED (rv) && title, NS_ERROR_FAILURE);

    return NS_OK;
}

nsresult EphyBrowser::GetSHUrlAtIndex (PRInt32 index, nsACString &url)
{
    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    nsCOMPtr<nsISHistory> SessionHistory;
    GetSHistory (getter_AddRefs(SessionHistory));
    NS_ENSURE_TRUE (SessionHistory, NS_ERROR_FAILURE);

    nsCOMPtr<nsIHistoryEntry> he;
    SessionHistory->GetEntryAtIndex (index, PR_FALSE,
                     getter_AddRefs (he));
    NS_ENSURE_TRUE (he, NS_ERROR_FAILURE);

    nsCOMPtr<nsIURI> uri;
    he->GetURI (getter_AddRefs(uri));
    NS_ENSURE_TRUE (uri, NS_ERROR_FAILURE);

    nsresult rv;
    rv = uri->GetSpec(url);
    NS_ENSURE_TRUE (NS_SUCCEEDED (rv) && url.Length(), NS_ERROR_FAILURE);

    return NS_OK;
}

nsresult EphyBrowser::GetPageDescriptor(nsISupports **aPageDescriptor)
{
    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    nsCOMPtr<nsIDocShell> ds = do_GetInterface (mWebBrowser);

    nsCOMPtr<nsIWebPageDescriptor> wpd = do_QueryInterface (ds);
    NS_ENSURE_TRUE (wpd, NS_ERROR_FAILURE);

    *aPageDescriptor = wpd.get();
    NS_IF_ADDREF (*aPageDescriptor);

    return NS_OK;
}

nsresult EphyBrowser::GetDOMWindow (nsIDOMWindow **aDOMWindow)
{
    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    NS_IF_ADDREF (*aDOMWindow = mDOMWindow);

    return NS_OK;
}

nsresult EphyBrowser::GetDocumentURI (nsIURI **aURI)
{
    if (!mDOMWindow) return NS_ERROR_NOT_INITIALIZED;

    nsresult rv;
    nsCOMPtr<nsIWebNavigation> webNav (do_GetInterface (mDOMWindow, &rv));
    NS_ENSURE_SUCCESS (rv, rv);

    return webNav->GetCurrentURI (aURI);
}

nsresult EphyBrowser::GetTargetDocumentURI (nsIURI **aURI)
{
    if (!mWebBrowser) return NS_ERROR_NOT_INITIALIZED;

        nsCOMPtr<nsIDOMDocument> domDoc;
    GetTargetDocument (getter_AddRefs(domDoc));
    NS_ENSURE_TRUE (domDoc, NS_ERROR_FAILURE);

    nsCOMPtr<nsIDOMDocumentView> docView (do_QueryInterface (domDoc));
    NS_ENSURE_TRUE (docView, NS_ERROR_FAILURE);

    nsCOMPtr<nsIDOMAbstractView> abstractView;
    docView->GetDefaultView (getter_AddRefs (abstractView));
    NS_ENSURE_TRUE (abstractView, NS_ERROR_FAILURE);
    /* the abstract view is really the DOM window */

    nsresult rv;
    nsCOMPtr<nsIWebNavigation> webNav (do_GetInterface (abstractView, &rv));
    NS_ENSURE_SUCCESS (rv, rv);

    return webNav->GetCurrentURI (aURI);
}

nsresult EphyBrowser::ForceEncoding (const char *encoding) 
{
    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    nsCOMPtr<nsIContentViewer> contentViewer;   
    GetContentViewer (getter_AddRefs(contentViewer));
    NS_ENSURE_TRUE (contentViewer, NS_ERROR_FAILURE);

    nsCOMPtr<nsIMarkupDocumentViewer> mdv = do_QueryInterface(contentViewer);
    NS_ENSURE_TRUE (mdv, NS_ERROR_FAILURE);

    return mdv->SetForceCharacterSet (nsEmbedCString(encoding));
}

nsresult EphyBrowser::GetEncoding (nsACString &encoding)
{
    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    nsCOMPtr<nsIDocCharset> docCharset = do_GetInterface (mWebBrowser);
    NS_ENSURE_TRUE (docCharset, NS_ERROR_FAILURE);

    char *charset;
    docCharset->GetCharset (&charset);
    encoding = charset;
    nsMemory::Free (charset);

    return NS_OK;
}

nsresult EphyBrowser::GetForcedEncoding (nsACString &encoding)
{
    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    nsCOMPtr<nsIContentViewer> contentViewer;   
    GetContentViewer (getter_AddRefs(contentViewer));
    NS_ENSURE_TRUE (contentViewer, NS_ERROR_FAILURE);

    nsCOMPtr<nsIMarkupDocumentViewer> mdv = do_QueryInterface(contentViewer);
    NS_ENSURE_TRUE (mdv, NS_ERROR_FAILURE);

    nsresult rv;
    rv = mdv->GetForceCharacterSet (encoding);
    NS_ENSURE_SUCCESS (rv, NS_ERROR_FAILURE);

    return NS_OK;
}

nsresult EphyBrowser::PushTargetDocument (nsIDOMDocument *domDoc)
{
    mTargetDocument = domDoc;

    return NS_OK;
}

nsresult EphyBrowser::PopTargetDocument ()
{
    mTargetDocument = nsnull;

    return NS_OK;
}

nsresult EphyBrowser::DoCommand (const char *command)
{
    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    nsCOMPtr<nsICommandManager> cmdManager;
    cmdManager = do_GetInterface (mWebBrowser);
    NS_ENSURE_TRUE (cmdManager, NS_ERROR_FAILURE);

    return cmdManager->DoCommand (command, nsnull, nsnull);
}

nsresult EphyBrowser::GetCommandState (const char *command, PRBool *enabled)
{
    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    nsCOMPtr<nsICommandManager> cmdManager;
    cmdManager = do_GetInterface (mWebBrowser);
    NS_ENSURE_TRUE (cmdManager, NS_ERROR_FAILURE);

    return cmdManager->IsCommandEnabled (command, nsnull, enabled);
}

#define NUM_MODIFIED_TEXTFIELDS_REQUIRED    2

PRBool
EphyBrowser::CompareFormsText (nsAString &aDefaultText, nsAString &aUserText)
{
    if (aDefaultText.Length() != aUserText.Length())
    {
        return FALSE;
    }

    /* Mozilla Bug 218277, 195946 and others */
    const PRUnichar *text = aDefaultText.BeginReading();
    for (PRUint32 i = 0; i < aDefaultText.Length(); i++)
    {
        if (text[i] == 0xa0)
        {
            aDefaultText.Replace (i, 1, ' ');
        }
    }

    return (memcmp (aDefaultText.BeginReading(),
                aUserText.BeginReading(),
                aUserText.Length() * sizeof (PRUnichar)) == 0);
}

nsresult EphyBrowser::GetDocumentHasModifiedForms (nsIDOMDocument *aDomDoc, PRUint32 *aNumTextFields, PRBool *aHasTextArea)
{
    nsCOMPtr<nsIDOMHTMLDocument> htmlDoc = do_QueryInterface(aDomDoc);
    /* it's okay not to be a HTML doc (happens for XUL documents, like about:config) */
    if (!htmlDoc) return NS_OK;

    nsCOMPtr<nsIDOMHTMLCollection> forms;
    htmlDoc->GetForms (getter_AddRefs (forms));
    if (!forms) return NS_OK; /* it's ok not to have any forms */

    PRUint32 formNum;
    forms->GetLength (&formNum);

    /* check all forms */
    for (PRUint32 formIndex = 0; formIndex < formNum; formIndex++)
    {
        nsCOMPtr<nsIDOMNode> formNode;
        forms->Item (formIndex, getter_AddRefs (formNode));
        if (!formNode) continue;

        nsCOMPtr<nsIDOMHTMLFormElement> formElement = do_QueryInterface (formNode);
        if (!formElement) continue;

        nsCOMPtr<nsIDOMHTMLCollection> formElements;
        formElement->GetElements (getter_AddRefs (formElements));
        if (!formElements) continue;

        PRUint32 elementNum;
        formElements->GetLength (&elementNum);

        /* check all input elements in the form for user input */
        for (PRUint32 elementIndex = 0; elementIndex < elementNum; elementIndex++)
        {
            nsCOMPtr<nsIDOMNode> domNode;
            formElements->Item (elementIndex, getter_AddRefs (domNode));
            if (!domNode) continue;

            nsCOMPtr<nsIDOMHTMLTextAreaElement> areaElement = do_QueryInterface (domNode);
            if (areaElement)
            {
                nsEmbedString defaultText, userText;
                areaElement->GetDefaultValue (defaultText);
                areaElement->GetValue (userText);

                if (!CompareFormsText (defaultText, userText))
                {
                    *aHasTextArea = PR_TRUE;
                    return NS_OK;
                }

                continue;
            }

            nsCOMPtr<nsIDOMHTMLInputElement> inputElement = do_QueryInterface(domNode);
            if (!inputElement) continue;
    
            nsEmbedString type;
            inputElement->GetType(type);

            nsEmbedCString cType;
            NS_UTF16ToCString (type, NS_CSTRING_ENCODING_UTF8, cType);

            if (g_ascii_strcasecmp (cType.get(), "text") == 0)
            {
                nsEmbedString defaultText, userText;
                PRInt32 max_length;
                inputElement->GetDefaultValue (defaultText);
                inputElement->GetValue (userText);
                inputElement->GetMaxLength (&max_length);

                /* There are forms for which defaultValue is longer than
                 * userValue. Mozilla consider this not a bug [see WONTFIXed
                 * bug 232057], but we need to check for this here.
                 */
                if (defaultText.Length() > (PRUint32)max_length)
                {
                    defaultText.Cut (max_length, PR_UINT32_MAX);
                }

                if (!CompareFormsText (defaultText, userText))
                {
                    (*aNumTextFields)++;
                    if (*aNumTextFields >= NUM_MODIFIED_TEXTFIELDS_REQUIRED)
                    {
                        return NS_OK;
                    }
                }
            }
        }
    }

    return NS_OK;
}

nsresult EphyBrowser::GetHasModifiedForms (PRBool *modified)
{
    *modified = PR_FALSE;

    NS_ENSURE_TRUE (mWebBrowser, NS_ERROR_FAILURE);

    nsCOMPtr<nsIDocShell> rootDocShell = do_GetInterface (mWebBrowser);
    NS_ENSURE_TRUE (rootDocShell, NS_ERROR_FAILURE);

    nsCOMPtr<nsISimpleEnumerator> enumerator;
    rootDocShell->GetDocShellEnumerator(nsIDocShellTreeItem::typeContent,
                        nsIDocShell::ENUMERATE_FORWARDS,
                        getter_AddRefs(enumerator));
    NS_ENSURE_TRUE (enumerator, NS_ERROR_FAILURE);

    PRBool hasMore;
    PRBool hasTextArea = PR_FALSE;
    PRUint32 numTextFields = 0;
    while (NS_SUCCEEDED(enumerator->HasMoreElements(&hasMore)) && hasMore)
    {
        nsCOMPtr<nsISupports> element;
        enumerator->GetNext (getter_AddRefs(element));
        if (!element) continue;

        nsCOMPtr<nsIDocShell> docShell = do_QueryInterface (element);
        if (!docShell) continue;

        nsCOMPtr<nsIContentViewer> contentViewer;
        docShell->GetContentViewer (getter_AddRefs(contentViewer));
        if (!contentViewer) continue;

        nsCOMPtr<nsIDOMDocument> domDoc;
        contentViewer->GetDOMDocument (getter_AddRefs (domDoc));

        nsresult rv;
        rv = GetDocumentHasModifiedForms (domDoc, &numTextFields, &hasTextArea);
        if (NS_SUCCEEDED (rv) &&
            (numTextFields >= NUM_MODIFIED_TEXTFIELDS_REQUIRED || hasTextArea))
        {
            *modified = PR_TRUE;
            break;
        }
    }

    return NS_OK;
}

nsresult
EphyBrowser::GetSecurityInfo (PRUint32 *aState, nsACString &aDescription)
{
#ifdef HAVE_MOZILLA_PSM
    NS_ENSURE_TRUE (mSecurityInfo, NS_ERROR_FAILURE);

    nsresult rv;
    rv = mSecurityInfo->GetState (aState);
    NS_ENSURE_SUCCESS (rv, NS_ERROR_FAILURE);

    nsEmbedString tooltip;
    rv = mSecurityInfo->GetTooltipText (tooltip);
    NS_ENSURE_SUCCESS (rv, NS_ERROR_FAILURE);

    NS_UTF16ToCString (tooltip,
               NS_CSTRING_ENCODING_UTF8, aDescription);

    return NS_OK;
#else
    return NS_ERROR_NOT_IMPLEMENTED;
#endif
}

nsresult
EphyBrowser::ShowCertificate ()
{
#ifdef HAVE_MOZILLA_PSM
    NS_ENSURE_TRUE (mSecurityInfo, NS_ERROR_FAILURE);

    nsCOMPtr<nsISSLStatusProvider> statusProvider (do_QueryInterface (mSecurityInfo));
    NS_ENSURE_TRUE (statusProvider, NS_ERROR_FAILURE);

    nsCOMPtr<nsISSLStatus> SSLStatus;
    statusProvider->GetSSLStatus (getter_AddRefs (SSLStatus));
    NS_ENSURE_TRUE (SSLStatus, NS_ERROR_FAILURE);

    nsCOMPtr<nsIX509Cert> serverCert;
    SSLStatus->GetServerCert (getter_AddRefs (serverCert));
    NS_ENSURE_TRUE (serverCert, NS_ERROR_FAILURE);

    nsCOMPtr<nsICertificateDialogs> certDialogs (do_GetService (NS_CERTIFICATEDIALOGS_CONTRACTID));
    NS_ENSURE_TRUE (certDialogs, NS_ERROR_FAILURE);

    nsCOMPtr<nsIInterfaceRequestor> requestor(do_QueryInterface (mDOMWindow));

    return certDialogs->ViewCert (requestor, serverCert);
#else
    return NS_OK;
#endif
}

EphyEmbedDocumentType
EphyBrowser::GetDocumentType ()
{
  EphyEmbedDocumentType type = EPHY_EMBED_DOCUMENT_OTHER;

  NS_ENSURE_TRUE (mDOMWindow, type);

  nsresult rv;
  nsCOMPtr<nsIDOMDocument> domDoc;
  rv = GetDocument (getter_AddRefs (domDoc));
  NS_ENSURE_SUCCESS (rv, type);

  nsCOMPtr<nsIDOMHTMLDocument> htmlDoc (do_QueryInterface (domDoc));
  nsCOMPtr<nsIDOMXMLDocument> xmlDoc (do_QueryInterface (domDoc));
  nsCOMPtr<nsIImageDocument> imgDoc (do_QueryInterface (domDoc));

  if (xmlDoc)
    {
      type = EPHY_EMBED_DOCUMENT_XML;
    }
  else if (imgDoc)
    {
      type = EPHY_EMBED_DOCUMENT_IMAGE;
    }
  else if (htmlDoc)
    {
      type = EPHY_EMBED_DOCUMENT_HTML;
    }

  return type;
}