evolution/mail/em-format-html-display.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  Authors: Michael Zucchi <notzed@ximian.com>
 *
 *  Copyright 2003 Ximian, Inc. (www.ximian.com)
 *
 *  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 of the License, 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 Street #330, Boston, MA 02111-1307, USA.
 *
 */


#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <string.h>

#include <gtkhtml/gtkhtml.h>
#include <gtkhtml/htmlengine.h>
#include <gtkhtml/htmlobject.h>
#include <gtkhtml/htmliframe.h>
#include <gtkhtml/htmlinterval.h>
#include <gtkhtml/gtkhtml-embedded.h>
#include <gtkhtml/gtkhtml-search.h>

#include <gtk/gtkvbox.h>
#include <gtk/gtkhbox.h>
#include <gtk/gtkbutton.h>
#include <gtk/gtkstock.h>
#include <gtk/gtkimage.h>
#include <gtk/gtkarrow.h>

#include <gtk/gtkmenu.h>
#include <gtk/gtkmenuitem.h>

#include <glade/glade.h>

#include <libgnomevfs/gnome-vfs-mime-handlers.h>

#if 0
#include <libgnomevfs/gnome-vfs-utils.h>
#include <libgnomevfs/gnome-vfs-mime-utils.h>
#include <libgnomevfs/gnome-vfs-mime.h>
#endif

#include <bonobo/bonobo-control-frame.h>
#include <bonobo/bonobo-stream-memory.h>
#include <bonobo/bonobo-widget.h>

#include <camel/camel-stream.h>
#include <camel/camel-stream-mem.h>
#include <camel/camel-mime-filter-tohtml.h>
#include <camel/camel-mime-part.h>
#include <camel/camel-multipart.h>
#include <camel/camel-multipart-signed.h>
#include <camel/camel-internet-address.h>
#include <camel/camel-mime-message.h>
#include <camel/camel-gpg-context.h>

#include <e-util/e-msgport.h>
#include <e-util/e-gui-utils.h>
#include <e-util/e-dialog-utils.h>

#include "mail-config.h"

#include "em-format-html-display.h"
#include "em-marshal.h"
#include "e-searching-tokenizer.h"
#include "em-icon-stream.h"
#include "em-utils.h"
#include "em-popup.h"
#include "em-icon-stream.h"

#define d(x)

#define EFHD_TABLE_OPEN "<table>"

struct _EMFormatHTMLDisplayPrivate {
	/* For the interactive search dialogue */
	/* TODO: Should this be more subtle, like the mozilla one? */
	GtkDialog *search_dialog;
	GtkWidget *search_entry;
	GtkWidget *search_matches_label;
	GtkWidget *search_case_check;
	char *search_text;
	int search_wrap;	/* are we doing a wrap search */
};

static int efhd_html_button_press_event (GtkWidget *widget, GdkEventButton *event, EMFormatHTMLDisplay *efh);
static void efhd_html_link_clicked (GtkHTML *html, const char *url, EMFormatHTMLDisplay *efhd);

struct _attach_puri {
	EMFormatPURI puri;

	const EMFormatHandler *handle;

	/* for the > and V buttons */
	GtkWidget *forward, *down;
	/* currently no way to correlate this data to the frame :( */
	GtkHTML *frame;
	CamelStream *output;
	unsigned int shown:1;
};

static void efhd_iframe_created(GtkHTML *html, GtkHTML *iframe, EMFormatHTMLDisplay *efh);
/*static void efhd_url_requested(GtkHTML *html, const char *url, GtkHTMLStream *handle, EMFormatHTMLDisplay *efh);
  static gboolean efhd_object_requested(GtkHTML *html, GtkHTMLEmbedded *eb, EMFormatHTMLDisplay *efh);*/

static void efhd_format_clone(EMFormat *, CamelMedium *, EMFormat *);
static void efhd_format_error(EMFormat *emf, CamelStream *stream, const char *txt);
static void efhd_format_message(EMFormat *, CamelStream *, CamelMedium *);
static void efhd_format_source(EMFormat *, CamelStream *, CamelMimePart *);
static void efhd_format_attachment(EMFormat *, CamelStream *, CamelMimePart *, const char *, const EMFormatHandler *);
static void efhd_complete(EMFormat *);

static void efhd_builtin_init(EMFormatHTMLDisplayClass *efhc);

enum {
	EFHD_LINK_CLICKED,
	EFHD_POPUP_EVENT,
	EFHD_LAST_SIGNAL,
};

static guint efhd_signals[EFHD_LAST_SIGNAL] = { 0 };


static EMFormatHTMLClass *efhd_parent;

static void
efhd_gtkhtml_realise(GtkHTML *html, EMFormatHTMLDisplay *efhd)
{
	GtkStyle *style;

	/* FIXME: does this have to be re-done every time we draw? */

	/* My favorite thing to do... muck around with colors so we respect people's stupid themes.
	   However, we only do this if we are rendering to the screen -- we ignore the theme
	   when we are printing. */
	style = gtk_widget_get_style((GtkWidget *)html);
	if (style) {
		int state = GTK_WIDGET_STATE(html);
		gushort r, g, b;
#define SCALE (238)

		/* choose a suitably darker or lighter colour */
		r = style->base[state].red >> 8;
		g = style->base[state].green >> 8;
		b = style->base[state].blue >> 8;

		if (r+b+g > 128*3) {
			r = (r*SCALE) >> 8;
			g = (g*SCALE) >> 8;
			b = (b*SCALE) >> 8;
		} else {
			r = 128 - ((SCALE * r) >> 9);
			g = 128 - ((SCALE * g) >> 9);
			b = 128 - ((SCALE * b) >> 9);
		}

		efhd->formathtml.body_colour = ((r<<16) | (g<< 8) | b) & 0xffffff;
		
		r = style->text[state].red >> 8;
		g = style->text[state].green >> 8;
		b = style->text[state].blue >> 8;

		efhd->formathtml.text_colour = ((r<<16) | (g<< 8) | b) & 0xffffff;
	}
#undef SCALE
}

static void
efhd_init(GObject *o)
{
	EMFormatHTMLDisplay *efhd = (EMFormatHTMLDisplay *)o;
#define efh ((EMFormatHTML *)efhd)

	efhd->priv = g_malloc0(sizeof(*efhd->priv));

	efhd->search_tok = (ESearchingTokenizer *)e_searching_tokenizer_new();
	html_engine_set_tokenizer(efh->html->engine, (HTMLTokenizer *)efhd->search_tok);

	g_signal_connect(efh->html, "realize", G_CALLBACK(efhd_gtkhtml_realise), o);

	/* we want to convert url's etc */
	efh->text_html_flags |= CAMEL_MIME_FILTER_TOHTML_CONVERT_URLS | CAMEL_MIME_FILTER_TOHTML_CONVERT_ADDRESSES;
#undef efh
}

static void
efhd_finalise(GObject *o)
{
	EMFormatHTMLDisplay *efhd = (EMFormatHTMLDisplay *)o;

	/* check pending stuff */

	g_free(efhd->priv->search_text);
	g_free(efhd->priv);

	((GObjectClass *)efhd_parent)->finalize(o);
}

static gboolean
efhd_bool_accumulator(GSignalInvocationHint *ihint, GValue *out, const GValue *in, void *data)
{
	gboolean val = g_value_get_boolean(in);

	g_value_set_boolean(out, val);

	return !val;
}

static void
efhd_class_init(GObjectClass *klass)
{
	((EMFormatClass *)klass)->format_clone = efhd_format_clone;
	((EMFormatClass *)klass)->format_error = efhd_format_error;
	((EMFormatClass *)klass)->format_message = efhd_format_message;
	((EMFormatClass *)klass)->format_source = efhd_format_source;
	((EMFormatClass *)klass)->format_attachment = efhd_format_attachment;
	((EMFormatClass *)klass)->complete = efhd_complete;

	klass->finalize = efhd_finalise;

	efhd_signals[EFHD_LINK_CLICKED] = 
		g_signal_new("link_clicked",
			     G_TYPE_FROM_CLASS(klass),
			     G_SIGNAL_RUN_LAST,
			     G_STRUCT_OFFSET(EMFormatHTMLDisplayClass, link_clicked),
			     NULL, NULL,
			     g_cclosure_marshal_VOID__POINTER,
			     G_TYPE_NONE, 1, G_TYPE_POINTER);

	efhd_signals[EFHD_POPUP_EVENT] = 
		g_signal_new("popup_event",
			     G_TYPE_FROM_CLASS(klass),
			     G_SIGNAL_RUN_LAST,
			     G_STRUCT_OFFSET(EMFormatHTMLDisplayClass, popup_event),
			     efhd_bool_accumulator, NULL,
			     em_marshal_BOOLEAN__BOXED_POINTER_POINTER,
			     G_TYPE_BOOLEAN, 3,
			     GDK_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE,
			     G_TYPE_POINTER, G_TYPE_POINTER);

	efhd_builtin_init((EMFormatHTMLDisplayClass *)klass);
}

GType
em_format_html_display_get_type(void)
{
	static GType type = 0;

	if (type == 0) {
		static const GTypeInfo info = {
			sizeof(EMFormatHTMLDisplayClass),
			NULL, NULL,
			(GClassInitFunc)efhd_class_init,
			NULL, NULL,
			sizeof(EMFormatHTMLDisplay), 0,
			(GInstanceInitFunc)efhd_init
		};
		efhd_parent = g_type_class_ref(em_format_html_get_type());
		type = g_type_register_static(em_format_html_get_type(), "EMFormatHTMLDisplay", &info, 0);
	}

	return type;
}

EMFormatHTMLDisplay *em_format_html_display_new(void)
{
	EMFormatHTMLDisplay *efhd;

	efhd = g_object_new(em_format_html_display_get_type(), 0);

	g_signal_connect(efhd->formathtml.html, "iframe_created", G_CALLBACK(efhd_iframe_created), efhd);
	g_signal_connect(efhd->formathtml.html, "link_clicked", G_CALLBACK(efhd_html_link_clicked), efhd);
	g_signal_connect(efhd->formathtml.html, "button_press_event", G_CALLBACK(efhd_html_button_press_event), efhd);

	return efhd;
}

void em_format_html_display_goto_anchor(EMFormatHTMLDisplay *efhd, const char *name)
{
	printf("FIXME: go to anchor '%s'\n", name);
}

void em_format_html_display_set_animate(EMFormatHTMLDisplay *efhd, gboolean state)
{
	efhd->animate = state;
	gtk_html_set_animate(((EMFormatHTML *)efhd)->html, state);
}

void em_format_html_display_set_caret_mode(EMFormatHTMLDisplay *efhd, gboolean state)
{
	efhd->caret_mode = state;
	gtk_html_set_caret_mode(((EMFormatHTML *)efhd)->html, state);
}

void
em_format_html_display_set_search(EMFormatHTMLDisplay *efhd, int type, GSList *strings)
{
	switch(type&3) {
	case EM_FORMAT_HTML_DISPLAY_SEARCH_PRIMARY:
		e_searching_tokenizer_set_primary_case_sensitivity(efhd->search_tok, (type&EM_FORMAT_HTML_DISPLAY_SEARCH_ICASE) == 0);
		e_searching_tokenizer_set_primary_search_string(efhd->search_tok, NULL);
		while (strings) {
			e_searching_tokenizer_add_primary_search_string(efhd->search_tok, strings->data);
			strings = strings->next;
		}
		break;
	case EM_FORMAT_HTML_DISPLAY_SEARCH_SECONDARY:
	default:
		e_searching_tokenizer_set_secondary_case_sensitivity(efhd->search_tok, (type&EM_FORMAT_HTML_DISPLAY_SEARCH_ICASE) == 0);
		e_searching_tokenizer_set_secondary_search_string(efhd->search_tok, NULL);
		while (strings) {
			e_searching_tokenizer_add_secondary_search_string(efhd->search_tok, strings->data);
			strings = strings->next;
		}
		break;
	}

	d(printf("redrawing with search\n"));
	em_format_format_clone((EMFormat *)efhd, ((EMFormat *)efhd)->message, (EMFormat *)efhd);
}

static void
efhd_update_matches(EMFormatHTMLDisplay *efhd)
{
	struct _EMFormatHTMLDisplayPrivate *p = efhd->priv;
	char *str;
	/* message-search popup match count string */
	char *fmt = _("Matches: %d");

	if (p->search_dialog) {
		str = alloca(strlen(fmt)+32);
		sprintf(str, fmt, e_searching_tokenizer_match_count(efhd->search_tok));
		gtk_label_set_text((GtkLabel *)p->search_matches_label, str);
	}
}

static void
efhd_update_search(EMFormatHTMLDisplay *efhd)
{
	struct _EMFormatHTMLDisplayPrivate *p = efhd->priv;
	GSList *words = NULL;
	int flags = 0;

	if (p->search_text == NULL)
		return;

	if (!gtk_toggle_button_get_active((GtkToggleButton *)p->search_case_check))
		flags = EM_FORMAT_HTML_DISPLAY_SEARCH_ICASE | EM_FORMAT_HTML_DISPLAY_SEARCH_PRIMARY;
	else
		flags = EM_FORMAT_HTML_DISPLAY_SEARCH_PRIMARY;

	if (p->search_text)
		words = g_slist_append(words, p->search_text);

	em_format_html_display_set_search(efhd, flags, words);
	g_slist_free(words);
}

static void
efhd_search_response(GtkWidget *w, int button, EMFormatHTMLDisplay *efhd)
{
	struct _EMFormatHTMLDisplayPrivate *p = efhd->priv;

	if (button == GTK_RESPONSE_ACCEPT) {
		char *txt = g_strdup(gtk_entry_get_text((GtkEntry *)p->search_entry));

		g_strstrip(txt);
		if (p->search_text && strcmp(p->search_text, txt) == 0 && !p->search_wrap) {
			if (!gtk_html_engine_search_next(((EMFormatHTML *)efhd)->html))
				p->search_wrap = TRUE;
			g_free(txt);
		} else {
			g_free(p->search_text);
			p->search_text = txt;
			if (!p->search_wrap)
				efhd_update_search(efhd);
			p->search_wrap = FALSE;
			gtk_html_engine_search(((EMFormatHTML *)efhd)->html, txt,
					       gtk_toggle_button_get_active((GtkToggleButton *)p->search_case_check),
					       TRUE, FALSE);
		}
	} else {
		g_free(p->search_text);
		p->search_text = NULL;
		gtk_widget_destroy((GtkWidget *)p->search_dialog);
		p->search_dialog = NULL;
	}
}

static void
efhd_search_case_toggled(GtkWidget *w, EMFormatHTMLDisplay *efhd)
{
	struct _EMFormatHTMLDisplayPrivate *p = efhd->priv;

	g_free(p->search_text);
	p->search_text = NULL;
	efhd_search_response(w, GTK_RESPONSE_ACCEPT, efhd);
}

static void
efhd_search_entry_activate(GtkWidget *w, EMFormatHTMLDisplay *efhd)
{
	efhd_search_response(w, GTK_RESPONSE_ACCEPT, efhd);
}

/**
 * em_format_html_display_search:
 * @efhd: 
 * 
 * Run an interactive search dialogue.
 **/
void
em_format_html_display_search(EMFormatHTMLDisplay *efhd)
{
	struct _EMFormatHTMLDisplayPrivate *p = efhd->priv;
	GladeXML *xml;

	if (p->search_dialog) {
		gdk_window_raise(((GtkWidget *)p->search_dialog)->window);
		return;
	}

	xml = glade_xml_new (EVOLUTION_GLADEDIR "/mail-search.glade", "search_message_dialog", NULL);
	if (xml == NULL) {
		g_warning("Cannot open search dialog glade file");
		/* ?? */
		return;
	}

	/* TODO: The original put the subject in the frame, but it had some
	   ugly arbitrary string-cutting code to make sure it fit. */

	p->search_dialog = (GtkDialog *)glade_xml_get_widget(xml, "search_message_dialog");
	p->search_entry = glade_xml_get_widget(xml, "search_entry");
	p->search_matches_label = glade_xml_get_widget(xml, "search_matches_label");
	p->search_case_check = glade_xml_get_widget(xml, "search_case_check");
	p->search_wrap = FALSE;

	gtk_dialog_set_default_response((GtkDialog *)p->search_dialog, GTK_RESPONSE_ACCEPT);
	efhd_update_matches(efhd);

	g_signal_connect(p->search_entry, "activate", G_CALLBACK(efhd_search_entry_activate), efhd);
	g_signal_connect(p->search_case_check, "toggled", G_CALLBACK(efhd_search_case_toggled), efhd);
	g_signal_connect(p->search_dialog, "response", G_CALLBACK(efhd_search_response), efhd);
	e_dialog_set_transient_for((GtkWindow *)p->search_dialog, (GtkWidget *)efhd);
	gtk_widget_show((GtkWidget *)p->search_dialog);
}

void
em_format_html_display_cut (EMFormatHTMLDisplay *efhd)
{
	gtk_html_cut (((EMFormatHTML *) efhd)->html);
}

void
em_format_html_display_copy (EMFormatHTMLDisplay *efhd)
{
	gtk_html_copy (((EMFormatHTML *) efhd)->html);
}

void
em_format_html_display_paste (EMFormatHTMLDisplay *efhd)
{
	gtk_html_paste (((EMFormatHTML *) efhd)->html, FALSE);
}

void
em_format_html_display_zoom_in (EMFormatHTMLDisplay *efhd)
{
	gtk_html_zoom_in (((EMFormatHTML *) efhd)->html);
}

void
em_format_html_display_zoom_out (EMFormatHTMLDisplay *efhd)
{
	gtk_html_zoom_out (((EMFormatHTML *) efhd)->html);
}

void
em_format_html_display_zoom_reset (EMFormatHTMLDisplay *efhd)
{
	gtk_html_zoom_reset (((EMFormatHTML *) efhd)->html);
}

/* ********************************************************************** */

static void
efhd_iframe_created(GtkHTML *html, GtkHTML *iframe, EMFormatHTMLDisplay *efh)
{
	d(printf("Iframe created %p ... \n", iframe));

	g_signal_connect(iframe, "button_press_event", G_CALLBACK (efhd_html_button_press_event), efh);

	return;
}

static int
efhd_html_button_press_event (GtkWidget *widget, GdkEventButton *event, EMFormatHTMLDisplay *efhd)
{
	HTMLEngine *e;
	HTMLPoint *point;
	const char *url;
	gboolean res = FALSE;

	if (event->button != 3)
		return FALSE;

	e = ((GtkHTML *)widget)->engine;
	point = html_engine_get_point_at(e, event->x, event->y, FALSE);			
	if (point == NULL)
		return FALSE;

	d(printf("popup button pressed\n"));

	if ( (url = html_object_get_src(point->object)) != NULL
	     || (url = html_object_get_url(point->object, 0)) != NULL) {
		EMFormatPURI *puri;
		char *uri;

		uri = gtk_html_get_url_object_relative((GtkHTML *)widget, point->object, url);
		puri = em_format_find_puri((EMFormat *)efhd, uri);

		d(printf("poup event, uri = '%s' part = '%p'\n", uri, puri?puri->part:NULL));

		g_signal_emit((GtkObject *)efhd, efhd_signals[EFHD_POPUP_EVENT], 0, event, uri, puri?puri->part:NULL, &res);
		g_free(uri);
	}
	
	html_point_destroy(point);

	return res;
}

static void
efhd_html_link_clicked (GtkHTML *html, const char *url, EMFormatHTMLDisplay *efhd)
{
	d(printf("link clicked event '%s'\n", url));
	g_signal_emit((GObject *)efhd, efhd_signals[EFHD_LINK_CLICKED], 0, url);
}

static void
efhd_complete(EMFormat *emf)
{
	EMFormatHTMLDisplay *efhd = (EMFormatHTMLDisplay *)emf;

	if (efhd->priv->search_dialog)
		efhd_update_matches(efhd);
}

/* ********************************************************************** */

static const struct {
	const char *icon, *description;
} smime_sign_table[4] = {
	{ NULL, N_("This message is not signed.  There is no guarantee the sender of the message is authentic.") },
	{ "pgp-signature-ok.png", N_("This message is signed and is valid, the sender of this message is very likely who they claim to be.") },
	{ "pgp-signature-bad.png", N_("The signature of this message cannot be verified, it may have been altered in transit.") },
	{ "pgp-signature-nokey.png", N_("This message is signed with a valid signature, but the sender of the message cannot be verified.") },
};

static const struct {
	const char *icon, *description;
} smime_encrypt_table[4] = {
	{ NULL, N_("This message is not encrypted.  It's content may be viewed in transit across The Internet.") },
	{ "pgp-signature-ok.png", N_("This message is encrypted, but with a weak encryption algorithm.  It would be difficult, but not impossible for an outsider to view the content of this message in a practical amount of time.") },
	{ "pgp-signature-ok.png", N_("This message is encrypted.  It would be difficult for an outsider to view the content of this message.") },
	{ "pgp-signature-ok.png", N_("This message is encrypted, with a strong encryption algorithm.  It would be very difficult for an outsider to view the content of this message in a practical amount of time.") },
};

struct _smime_pobject {
	EMFormatHTMLPObject object;

	int signature;
	CamelCipherValidity *valid;
	GtkWidget *widget;
};

static void
efhd_xpkcs7mime_free(EMFormatHTMLPObject *o)
{
	struct _smime_pobject *po = (struct _smime_pobject *)o;

	if (po->widget)
		gtk_widget_destroy(po->widget);
	camel_cipher_validity_free(po->valid);
}

static void
efhd_xpkcs7mime_info_response(GtkWidget *w, guint button, struct _smime_pobject *po)
{
	gtk_widget_destroy(w);
	po->widget = NULL;
}

static void
efhd_xpkcs7mime_validity_clicked(GtkWidget *button, EMFormatHTMLPObject *pobject)
{
	struct _smime_pobject *po = (struct _smime_pobject *)pobject;
	GladeXML *xml;
	GtkWidget *vbox, *w;

	if (po->widget)
		/* FIXME: window raise? */
		return;

	xml = glade_xml_new(EVOLUTION_GLADEDIR "/mail-security.glade", "message_security_dialog", NULL);
	po->widget = glade_xml_get_widget(xml, "message_security_dialog");

	vbox = glade_xml_get_widget(xml, "signature_vbox");
	w = gtk_label_new(_(smime_sign_table[po->valid->sign.status].description));
	gtk_label_set_line_wrap((GtkLabel *)w, TRUE);
	gtk_box_pack_start((GtkBox *)vbox, w, TRUE, TRUE, 6);
	if (po->valid->sign.description) {
		w = gtk_label_new(po->valid->sign.description);
		gtk_label_set_line_wrap((GtkLabel *)w, TRUE);
		gtk_box_pack_start((GtkBox *)vbox, w, TRUE, TRUE, 6);
	}
	gtk_widget_show_all(vbox);

	vbox = glade_xml_get_widget(xml, "encryption_vbox");
	w = gtk_label_new(_(smime_encrypt_table[po->valid->encrypt.status].description));
	gtk_label_set_line_wrap((GtkLabel *)w, TRUE);
	gtk_box_pack_start((GtkBox *)vbox, w, TRUE, TRUE, 6);
	if (po->valid->encrypt.description) {
		w = gtk_label_new(po->valid->encrypt.description);
		gtk_label_set_line_wrap((GtkLabel *)w, TRUE);
		gtk_box_pack_start((GtkBox *)vbox, w, TRUE, TRUE, 6);
	}
	gtk_widget_show_all(vbox);

	g_object_unref(xml);

	g_signal_connect(po->widget, "response", G_CALLBACK(efhd_xpkcs7mime_info_response), po);
	gtk_widget_show(po->widget);
}

static gboolean
efhd_xpkcs7mime_button(EMFormatHTML *efh, GtkHTMLEmbedded *eb, EMFormatHTMLPObject *pobject)
{
	GtkWidget *icon, *button;
	GdkPixbuf *pixbuf;
	struct _smime_pobject *po = (struct _smime_pobject *)pobject;
	char *file;
	const char *name;

	if (po->signature)
		name = smime_sign_table[po->valid->sign.status].icon;
	else
		name = smime_encrypt_table[po->valid->encrypt.status].icon;

	file = g_build_filename(EVOLUTION_ICONSDIR, name, NULL);
	pixbuf = gdk_pixbuf_new_from_file(file, NULL);
	g_free(file);
	if (pixbuf == NULL)
		return FALSE;

	/* wtf isn't this just scaled on disk? */
	icon = gtk_image_new_from_pixbuf(gdk_pixbuf_scale_simple(pixbuf, 24, 24, GDK_INTERP_BILINEAR));
	g_object_unref(pixbuf);
	gtk_widget_show(icon);

	button = gtk_button_new();
	g_signal_connect(button, "clicked", G_CALLBACK(efhd_xpkcs7mime_validity_clicked), pobject);

	gtk_container_add((GtkContainer *)button, icon);
	gtk_widget_show(button);
	gtk_container_add((GtkContainer *)eb, button);

	return TRUE;
}

static void
efhd_application_xpkcs7mime(EMFormat *emf, CamelStream *stream, CamelMimePart *part, const EMFormatHandler *info)
{
	CamelCipherContext *context;
	CamelException *ex;
	extern CamelSession *session;
	CamelMimePart *opart;
	CamelCipherValidity *valid;

	ex = camel_exception_new();

	context = camel_smime_context_new(session);

	opart = camel_mime_part_new();
	valid = camel_cipher_decrypt(context, part, opart, ex);
	if (valid == NULL) {
		em_format_format_error(emf, stream, ex->desc?ex->desc:_("Could not parse S/MIME message: Unknown error"));
		em_format_part_as(emf, stream, part, NULL);
	} else {
		CamelCipherValidity *save = ((EMFormatHTML *)emf)->enveloped_validity;

		if (save != NULL)
			camel_cipher_validity_envelope(valid, save);

		((EMFormatHTML *)emf)->enveloped_validity = valid;
		em_format_part(emf, stream, opart);
		((EMFormatHTML *)emf)->enveloped_validity = save;

		if (save != NULL
		    && (valid->encrypt.status != CAMEL_CIPHER_VALIDITY_ENCRYPT_NONE
			|| valid->sign.status != CAMEL_CIPHER_VALIDITY_SIGN_NONE)) {
			char *classid;
			struct _smime_pobject *pobj;

			camel_stream_printf(stream, "<table border=1 width=\"100%%\" cellpadding=3 cellspacing=0><tr>");

			if (valid->sign.status != CAMEL_CIPHER_VALIDITY_SIGN_NONE) {
				classid = g_strdup_printf("smime:///em-format-html/%p/icon/signed", part);
				pobj = (struct _smime_pobject *)em_format_html_add_pobject((EMFormatHTML *)emf, sizeof(*pobj), classid, part, efhd_xpkcs7mime_button);
				pobj->valid = camel_cipher_validity_clone(valid);
				pobj->signature = TRUE;
				pobj->object.free = efhd_xpkcs7mime_free;
				camel_stream_printf(stream, "<td valign=top><object classid=\"%s\"></object><br>%s</td>", classid, valid->sign.description);
				g_free(classid);
			}

			if (valid->encrypt.status != CAMEL_CIPHER_VALIDITY_ENCRYPT_NONE) {
				classid = g_strdup_printf("smime:///em-format-html/%p/icon/encrypted", part);
				pobj = (struct _smime_pobject *)em_format_html_add_pobject((EMFormatHTML *)emf, sizeof(*pobj), classid, part, efhd_xpkcs7mime_button);
				pobj->valid = camel_cipher_validity_clone(valid);
				pobj->object.free = efhd_xpkcs7mime_free;
				camel_stream_printf(stream, "<td valign=top><object classid=\"%s\"></object><br>%s</td>", classid, valid->encrypt.description);
				g_free(classid);
			}

			camel_stream_printf(stream, "</tr></table>");
		}

		camel_cipher_validity_free(valid);
	}

	camel_object_unref(opart);
	camel_object_unref(context);
	camel_exception_free(ex);
}

/* ********************************************************************** */

static void
efhd_signature_check(GtkWidget *w, EMFormatHTMLPObject *pobject)
{
	d(printf("insert signature check here ... redraw ?  or what ?\n"));
	/* blah, do the old way for now, force a complete re-draw */
	em_format_set_inline((EMFormat *)pobject->format, pobject->part, TRUE);
	em_format_format_clone((EMFormat *)pobject->format, ((EMFormat *)pobject->format)->message, (EMFormat *)pobject->format);
}

static gboolean
efhd_signature_button(EMFormatHTML *efh, GtkHTMLEmbedded *eb, EMFormatHTMLPObject *pobject)
{
	GtkWidget *icon, *button;
	GdkPixbuf *pixbuf;

	pixbuf = gdk_pixbuf_new_from_file(EVOLUTION_ICONSDIR "/pgp-signature-nokey.png", NULL);
	if (pixbuf == NULL)
		return FALSE;

	/* wtf isn't this just scaled on disk? */
	icon = gtk_image_new_from_pixbuf(gdk_pixbuf_scale_simple(pixbuf, 24, 24, GDK_INTERP_BILINEAR));
	g_object_unref(pixbuf);
	gtk_widget_show(icon);

	button = gtk_button_new();
	g_signal_connect(button, "clicked", G_CALLBACK (efhd_signature_check), pobject);
	/*g_signal_connect (button, "key_press_event", G_CALLBACK (inline_button_press), part);*/

	gtk_container_add((GtkContainer *)button, icon);
	gtk_widget_show(button);
	gtk_container_add((GtkContainer *)eb, button);

	return TRUE;
}

static void
efhd_multipart_signed (EMFormat *emf, CamelStream *stream, CamelMimePart *part, const EMFormatHandler *info)
{
	char *classid;
	static int signedid;
	CamelMultipartSigned *mps;
	CamelMimePart *cpart;

	mps = (CamelMultipartSigned *)camel_medium_get_content_object((CamelMedium *)part);
	if (!CAMEL_IS_MULTIPART_SIGNED(mps)
	    || (cpart = camel_multipart_get_part((CamelMultipart *)mps, CAMEL_MULTIPART_SIGNED_CONTENT)) == NULL) {
		em_format_format_source(emf, stream, part);
		return;
	}

	em_format_part(emf, stream, cpart);

	if (em_format_is_inline(emf, part)) {
		em_format_html_multipart_signed_sign(emf, stream, part);
	} else {
		classid = g_strdup_printf("multipart-signed:///icon/%d", signedid++);

		/* wtf is this so fugly? */
		camel_stream_printf(stream,
				    "<br><table cellspacing=0 cellpadding=0>"
				    "<tr><td><table width=10 cellspacing=0 cellpadding=0>"
				    "<tr><td></td></tr></table></td>"
				    "<td><object classid=\"%s\"></object></td>"
				    "<td><table width=3 cellspacing=0 cellpadding=0>"
				    "<tr><td></td></tr></table></td>"
				    "<td><font size=-1>%s</font></td></tr>"
				    "<tr><td height=10>"
				    "<table cellspacing=0 cellpadding=0><tr>"
				    "<td height=10><a name=\"glue\"></td></tr>"
				    "</table></td></tr></table>\n",
				    classid,
				    _("This message is digitally signed. Click the lock icon for more information."));

		em_format_html_add_pobject((EMFormatHTML *)emf, sizeof(EMFormatHTMLPObject), classid, part, efhd_signature_button);
		g_free(classid);
	}
}

/* ********************************************************************** */

static EMFormatHandler type_builtin_table[] = {
	{ "application/x-pkcs7-mime", (EMFormatFunc)efhd_application_xpkcs7mime },
	{ "multipart/signed", (EMFormatFunc)efhd_multipart_signed },
};

static void
efhd_builtin_init(EMFormatHTMLDisplayClass *efhc)
{
	int i;

	for (i=0;i<sizeof(type_builtin_table)/sizeof(type_builtin_table[0]);i++)
		em_format_class_add_handler((EMFormatClass *)efhc, &type_builtin_table[i]);
}

/* ********************************************************************** */

static void efhd_format_clone(EMFormat *emf, CamelMedium *part, EMFormat *src)
{
	((EMFormatClass *)efhd_parent)->format_clone(emf, part, src);
}

/* TODO: if these aren't going to do anything should remove */
static void efhd_format_error(EMFormat *emf, CamelStream *stream, const char *txt)
{
	((EMFormatClass *)efhd_parent)->format_error(emf, stream, txt);
}

static void efhd_format_message(EMFormat *emf, CamelStream *stream, CamelMedium *part)
{
	((EMFormatClass *)efhd_parent)->format_message(emf, stream, part);
}

static void efhd_format_source(EMFormat *emf, CamelStream *stream, CamelMimePart *part)
{
	((EMFormatClass *)efhd_parent)->format_source(emf, stream, part);
}

/* ********************************************************************** */

/* if it hasn't been processed yet, format the attachment */
static void
efhd_attachment_show(GtkWidget *w, struct _attach_puri *info)
{
	d(printf("show attachment button called\n"));

	info->shown = ~info->shown;
	em_format_set_inline(info->puri.format, info->puri.part, info->shown);
	/* FIXME: do this in an idle handler */
	em_format_format_clone(info->puri.format, info->puri.format->message, info->puri.format);
#if 0
	/* FIXME: track shown state in parent */

	if (info->shown) {
		d(printf("hiding\n"));
		info->shown = FALSE;
		if (info->frame)
			gtk_widget_hide((GtkWidget *)info->frame);
		gtk_widget_show(info->forward);
		gtk_widget_hide(info->down);
	} else {
		d(printf("showing\n"));
		info->shown = TRUE;
		if (info->frame)
			gtk_widget_show((GtkWidget *)info->frame);
		gtk_widget_hide(info->forward);
		gtk_widget_show(info->down);

		/* have we decoded it yet? */
		if (info->output) {
			info->handle->handler(info->puri.format, info->output, info->puri.part, info->handle);
			camel_stream_close(info->output);
			camel_object_unref(info->output);
			info->output = NULL;
		}
	}

	em_format_set_inline(info->puri.format, info->puri.part, info->shown);
#endif
}

static EMPopupItem efhd_menu_items[] = {
	{ EM_POPUP_BAR, "05.display", },
	{ EM_POPUP_ITEM, "05.display.00", N_("_View Inline"), G_CALLBACK(efhd_attachment_show) },
	{ EM_POPUP_ITEM, "05.display.00", N_("_Hide"), G_CALLBACK(efhd_attachment_show) },
};

static void
efhd_popup_place_widget(GtkMenu *menu, int *x, int *y, gboolean *push_in, gpointer user_data)
{
	GtkWidget *w = user_data;
	
	gdk_window_get_origin(gtk_widget_get_parent_window(w), x, y);
	*x += w->allocation.x + w->allocation.width;
	*y += w->allocation.y;
}

static gboolean
efhd_attachment_popup(GtkWidget *w, GdkEventButton *event, struct _attach_puri *info)
{
	GtkMenu *menu;
	GSList *menus = NULL;
	EMPopup *emp;
	EMPopupTarget *target;
	EMPopupItem *item;

	d(printf("attachment popup, button %d\n", event->button));

	if (event && event->button != 1 && event->button != 3) {
		/* ?? gtk_propagate_event(GTK_WIDGET (user_data), (GdkEvent *)event);*/
		return FALSE;
	}

	emp = em_popup_new("com.ximian.mail.formathtmldisplay.popup.part");
	target = em_popup_target_new_part(info->puri.part, info->handle?info->handle->mime_type:NULL);
	target->widget = w;

	/* add our local menus */
	efhd_menu_items[0].activate_data = info;
	menus = g_slist_prepend(menus, &efhd_menu_items[0]);
	item = &efhd_menu_items[info->shown?2:1];
	item->activate_data = info;
	menus = g_slist_prepend(menus, item);

	menu = em_popup_create_menu_once(emp, target, target->mask, target->mask);
	if (event)
		gtk_menu_popup(menu, NULL, NULL, NULL, NULL, event->button, event->time);
	else
		gtk_menu_popup(menu, NULL, NULL, (GtkMenuPositionFunc)efhd_popup_place_widget, w, 0, gtk_get_current_event_time());

	return TRUE;
}

static gboolean
efhd_attachment_popup_menu(GtkWidget *w, struct _attach_puri *info)
{
	return efhd_attachment_popup(w, NULL, info);
}

/* ********************************************************************** */

static void
efhd_drag_data_get(GtkWidget *w, GdkDragContext *drag, GtkSelectionData *data, guint info, guint time, EMFormatHTMLPObject *pobject)
{
	CamelMimePart *part = pobject->part;
	char *uri, *path;
	CamelStream *stream;

	switch (info) {
	case 0: /* mime/type request */
		stream = camel_stream_mem_new();
		/* TODO: shoudl format_format_text run on the content-object? */
		/* TODO: should we just do format_content? */
		if (camel_content_type_is (((CamelDataWrapper *)part)->mime_type, "text", "*")) {
			/* FIXME: this should be an em_utils method, it only needs a default charset param */
			em_format_format_text((EMFormat *)pobject->format, stream, (CamelDataWrapper *)part);
		} else {
			CamelDataWrapper *dw = camel_medium_get_content_object((CamelMedium *)part);

			camel_data_wrapper_decode_to_stream(dw, stream);
		}

		gtk_selection_data_set(data, data->target, 8,
				       ((CamelStreamMem *)stream)->buffer->data,
				       ((CamelStreamMem *)stream)->buffer->len);
		camel_object_unref(stream);
		break;
	case 1: /* text-uri-list request */
		/* Kludge around Nautilus requesting the same data many times */
		uri = g_object_get_data((GObject *)w, "e-drag-uri");
		if (uri) {
			gtk_selection_data_set(data, data->target, 8, uri, strlen(uri));
			return;
		}

		path = em_utils_temp_save_part(w, part);
		if (path == NULL)
			return;

		uri = g_strdup_printf("file://%s\r\n", path);
		g_free(path);
		gtk_selection_data_set(data, data->target, 8, uri, strlen(uri));
		g_object_set_data_full((GObject *)w, "e-drag-uri", uri, g_free);
		break;
	default:
		abort();
	}
}

static void
efhd_drag_data_delete(GtkWidget *w, GdkDragContext *drag, EMFormatHTMLPObject *pobject)
{
	char *uri;
	
	uri = g_object_get_data((GObject *)w, "e-drag-uri");
	if (uri) {
		/* NB: this doesn't kill the dnd directory */
		/* NB: is this ever called? */
		unlink(uri+7);
		g_object_set_data((GObject *)w, "e-drag-uri", NULL);
	}
}

static void
efhd_write_icon_job(struct _EMFormatHTMLJob *job, int cancelled)
{
	EMFormatHTMLPObject *pobject;
	CamelDataWrapper *dw;

	if (cancelled)
		return;

	pobject = job->u.data;
	dw = camel_medium_get_content_object((CamelMedium *)pobject->part);
	camel_data_wrapper_decode_to_stream(dw, job->stream);
	camel_stream_close(job->stream);
}

/* attachment button callback */
static gboolean
efhd_attachment_button(EMFormatHTML *efh, GtkHTMLEmbedded *eb, EMFormatHTMLPObject *pobject)
{
	struct _attach_puri *info;
	GtkWidget *hbox, *w, *button, *mainbox;
	char *simple_type;
	GtkTargetEntry drag_types[] = {
		{ NULL, 0, 0 },
		{ "text/uri-list", 0, 1 },
	};

	/* FIXME: handle default shown case */
	d(printf("adding attachment button/content\n"));

	info = (struct _attach_puri *)em_format_find_puri((EMFormat *)efh, pobject->classid);
	g_assert(info != NULL);
	g_assert(info->forward == NULL);

	mainbox = gtk_hbox_new(FALSE, 0);

	button = gtk_button_new();

	if (info->handle)
		g_signal_connect(button, "clicked", G_CALLBACK(efhd_attachment_show), info);
	else
		GTK_WIDGET_UNSET_FLAGS(button, GTK_CAN_FOCUS);

	hbox = gtk_hbox_new(FALSE, 2);
	info->forward = gtk_image_new_from_stock(GTK_STOCK_GO_FORWARD, GTK_ICON_SIZE_BUTTON);
	gtk_box_pack_start((GtkBox *)hbox, info->forward, TRUE, TRUE, 0);
	if (info->handle) {
		info->down = gtk_image_new_from_stock(GTK_STOCK_GO_DOWN, GTK_ICON_SIZE_BUTTON);
		gtk_box_pack_start((GtkBox *)hbox, info->down, TRUE, TRUE, 0);
	}

	w = gtk_image_new();
	gtk_widget_set_size_request(w, 24, 24);
	gtk_box_pack_start((GtkBox *)hbox, w, TRUE, TRUE, 0);
	gtk_container_add((GtkContainer *)button, hbox);
	gtk_box_pack_start((GtkBox *)mainbox, button, TRUE, TRUE, 0);

	/* FIXME: loses any snoop info */
	simple_type = camel_content_type_simple (((CamelDataWrapper *)pobject->part)->mime_type);
	camel_strdown(simple_type);

	/* cache? */
	/* FIXME: offline parts, just get icon */
	if (camel_content_type_is (((CamelDataWrapper *)pobject->part)->mime_type, "image", "*")) {
		EMFormatHTMLJob *job;

		job = em_format_html_job_new(efh, efhd_write_icon_job, pobject);
		job->stream = (CamelStream *)em_icon_stream_new((GtkImage *)w);
		em_format_html_job_queue(efh, job);
	} else {
		GdkPixbuf *pixbuf = e_icon_for_mime_type(simple_type, 24);
		GdkPixbuf *mini = gdk_pixbuf_scale_simple(pixbuf, 24, 24, GDK_INTERP_BILINEAR);

		gtk_image_set_from_pixbuf((GtkImage *)w, mini);
		g_object_unref(mini);
		g_object_unref(pixbuf);
	}

	drag_types[0].target = simple_type;
	gtk_drag_source_set(button, GDK_BUTTON1_MASK, drag_types, sizeof(drag_types)/sizeof(drag_types[0]), GDK_ACTION_COPY);
	g_signal_connect(button, "drag-data-get", G_CALLBACK(efhd_drag_data_get), pobject);
	g_signal_connect (button, "drag-data-delete", G_CALLBACK(efhd_drag_data_delete), pobject);
	g_free(simple_type);

	button = gtk_button_new();
	/*GTK_WIDGET_UNSET_FLAGS(button, GTK_CAN_FOCUS);*/
	gtk_container_add((GtkContainer *)button, gtk_arrow_new(GTK_ARROW_DOWN, GTK_SHADOW_ETCHED_IN));
	g_signal_connect(button, "button_press_event", G_CALLBACK(efhd_attachment_popup), info);
	g_signal_connect(button, "popup_menu", G_CALLBACK(efhd_attachment_popup_menu), info);
	g_signal_connect(button, "clicked", G_CALLBACK(efhd_attachment_popup_menu), info);
	gtk_box_pack_start((GtkBox *)mainbox, button, TRUE, TRUE, 0);

	gtk_widget_show_all(mainbox);

	if (info->shown)
		gtk_widget_hide(info->forward);
	else if (info->down)
		gtk_widget_hide(info->down);

	gtk_container_add((GtkContainer *)eb, mainbox);

	return TRUE;
}

/* not used currently */
/* frame source callback */
static void
efhd_attachment_frame(EMFormat *emf, CamelStream *stream, EMFormatPURI *puri)
{
	struct _attach_puri *info = (struct _attach_puri *)puri;

	if (info->shown) {
		d(printf("writing to frame content, handler is '%s'\n", info->handle->mime_type));
		info->handle->handler(emf, stream, info->puri.part, info->handle);
		camel_stream_close(stream);
	} else {
		/* FIXME: this is leaked if the object is closed without showing it
		   NB: need a virtual puri_free method? */
		info->output = stream;
		camel_object_ref(stream);
	}
}

static gboolean
efhd_bonobo_object(EMFormatHTML *efh, GtkHTMLEmbedded *eb, EMFormatHTMLPObject *pobject)
{
	CamelDataWrapper *wrapper;
	Bonobo_ServerInfo *component;
	GtkWidget *embedded;
	Bonobo_PersistStream persist;	
	CORBA_Environment ev;
	CamelStreamMem *cstream;
	BonoboStream *bstream;
	BonoboControlFrame *control_frame;
	Bonobo_PropertyBag prop_bag;

	component = gnome_vfs_mime_get_default_component(eb->type);
	if (component == NULL)
		return FALSE;

	embedded = bonobo_widget_new_control(component->iid, NULL);
	CORBA_free(component);
	if (embedded == NULL)
		return FALSE;
	
	CORBA_exception_init(&ev);

	control_frame = bonobo_widget_get_control_frame((BonoboWidget *)embedded);
	prop_bag = bonobo_control_frame_get_control_property_bag(control_frame, NULL);
	if (prop_bag != CORBA_OBJECT_NIL) {
		/*
		 * Now we can take care of business. Currently, the only control
		 * that needs something passed to it through a property bag is
		 * the iTip control, and it needs only the From email address,
		 * but perhaps in the future we can generalize this section of code
		 * to pass a bunch of useful things to all embedded controls.
		 */
		const CamelInternetAddress *from;
		char *from_address;
				
		from = camel_mime_message_get_from((CamelMimeMessage *)((EMFormat *)efh)->message);
		from_address = camel_address_encode((CamelAddress *)from);
		bonobo_property_bag_client_set_value_string(prop_bag, "from_address", from_address, &ev);
		g_free(from_address);
		
		Bonobo_Unknown_unref(prop_bag, &ev);
	}
	
	persist = (Bonobo_PersistStream)Bonobo_Unknown_queryInterface(bonobo_widget_get_objref((BonoboWidget *)embedded),
								      "IDL:Bonobo/PersistStream:1.0", NULL);
	if (persist == CORBA_OBJECT_NIL) {
		gtk_object_sink((GtkObject *)embedded);
		CORBA_exception_free(&ev);				
		return FALSE;
	}
	
	/* Write the data to a CamelStreamMem... */
	cstream = (CamelStreamMem *)camel_stream_mem_new();
	wrapper = camel_medium_get_content_object((CamelMedium *)pobject->part);
 	camel_data_wrapper_decode_to_stream(wrapper, (CamelStream *)cstream);
	
	/* ...convert the CamelStreamMem to a BonoboStreamMem... */
	bstream = bonobo_stream_mem_create(cstream->buffer->data, cstream->buffer->len, TRUE, FALSE);
	camel_object_unref(cstream);
	
	/* ...and hydrate the PersistStream from the BonoboStream. */
	Bonobo_PersistStream_load(persist,
				  bonobo_object_corba_objref(BONOBO_OBJECT (bstream)),
				  eb->type, &ev);
	bonobo_object_unref(BONOBO_OBJECT (bstream));
	Bonobo_Unknown_unref(persist, &ev);
	CORBA_Object_release(persist, &ev);
	
	if (ev._major != CORBA_NO_EXCEPTION) {
		gtk_object_sink((GtkObject *)embedded);
		CORBA_exception_free(&ev);				
		return FALSE;
	}
	CORBA_exception_free(&ev);
	
	gtk_widget_show(embedded);
	gtk_container_add(GTK_CONTAINER (eb), embedded);
	
	return TRUE;
}

static gboolean
efhd_check_server_prop(Bonobo_ServerInfo *component, const char *propname, const char *value)
{
	CORBA_sequence_CORBA_string stringv;
	Bonobo_ActivationProperty *prop;
	int i;

	prop = bonobo_server_info_prop_find(component, propname);
	if (!prop || prop->v._d != Bonobo_ACTIVATION_P_STRINGV)
		return FALSE;

	stringv = prop->v._u.value_stringv;
	for (i = 0; i < stringv._length; i++) {
		if (!g_ascii_strcasecmp(value, stringv._buffer[i]))
			return TRUE;
	}

	return FALSE;
}

static gboolean
efhd_use_component(const char *mime_type)
{
	GList *components, *iter;
	Bonobo_ServerInfo *component = NULL;

	/* should this cache it? */

	if (g_ascii_strcasecmp(mime_type, "text/x-vcard") != 0
	    && g_ascii_strcasecmp(mime_type, "text/calendar") != 0) {
		const char **mime_types;
		int i;

		mime_types = mail_config_get_allowable_mime_types();
		for (i = 0; mime_types[i]; i++) {
			if (!g_ascii_strcasecmp(mime_types[i], mime_type))
				goto type_ok;
		}
		return FALSE;
	}
type_ok:
	components = gnome_vfs_mime_get_all_components (mime_type);
	for (iter = components; iter; iter = iter->next) {
		Bonobo_ServerInfo *comp = iter->data;

		comp = iter->data;
		if (efhd_check_server_prop(comp, "repo_ids", "IDL:Bonobo/PersistStream:1.0")
		    && efhd_check_server_prop(comp, "bonobo:supported_mime_types", mime_type)) {
			component = comp;
			break;
		}
	}
	gnome_vfs_mime_component_list_free (components);

	return component != NULL;
}

static void
efhd_format_attachment(EMFormat *emf, CamelStream *stream, CamelMimePart *part, const char *mime_type, const EMFormatHandler *handle)
{
	char *classid, *text, *html;
	struct _attach_puri *info;

	classid = g_strdup_printf("attachment-%p", part);
	info = (struct _attach_puri *)em_format_add_puri(emf, sizeof(*info), classid, part, efhd_attachment_frame);
	em_format_html_add_pobject((EMFormatHTML *)emf, sizeof(EMFormatHTMLPObject), classid, part, efhd_attachment_button);
	info->handle = handle;
	info->shown = em_format_is_inline(emf, info->puri.part) && handle != NULL;

	camel_stream_write_string(stream,
				  "<table height=6><tr><td><a></a></td></tr></table>\n"
				  "<table cellspacing=0 cellpadding=0><tr><td>"
				  "<table width=10 cellspacing=0 cellpadding=0>"
				  "<tr><td></td></tr></table></td>");

	camel_stream_printf(stream, "<td><object classid=\"%s\"></object></td>", classid);

	camel_stream_write_string(stream,
				  "<td><table width=3 cellspacing=0 cellpadding=0>"
				  "<tr><td></td></tr></table></td><td><font size=-1>");

	/* output some info about it */
	/* FIXME: should we look up mime_type from object again? */
	text = em_format_describe_part(part, mime_type);
	html = camel_text_to_html(text, ((EMFormatHTML *)emf)->text_html_flags & CAMEL_MIME_FILTER_TOHTML_CONVERT_URLS, 0);
	camel_stream_write_string(stream, html);
	g_free(html);
	g_free(text);

	camel_stream_write_string(stream,
				  "</font></td></tr><tr></table>\n"
				  "<table height=6><tr><td><a></a></td></tr></table>\n");

	if (handle) {
		if (info->shown)
			handle->handler(emf, stream, part, handle);
		/*camel_stream_printf(stream, "<iframe src=\"%s\" marginheight=0 marginwidth=0>%s</iframe>\n", classid, _("Attachment content could not be loaded"));*/
	} else if (efhd_use_component(mime_type)) {
		static int partid;

		g_free(classid); /* messy */

		classid = g_strdup_printf("bonobo-unknown:///em-formath-html-display/%p/%d", part, partid++);
		em_format_html_add_pobject((EMFormatHTML *)emf, sizeof(EMFormatHTMLPObject), classid, part, efhd_bonobo_object);
		camel_stream_printf(stream, "<object classid=\"%s\" type=\"%s\">\n", classid, mime_type);
	}

	g_free(classid);
}