[evolution] Bug #359755 - Support for CalDAV collections

[Milan Crha <mcrha src gnome org>]

commit a7cede983ca1580a16df40fd07cebea2d69cefa6
Author: Milan Crha <mcrha redhat com>
Date:   Mon Dec 7 21:19:50 2009 +0100

    Bug #359755 - Support for CalDAV collections

 plugins/caldav/Makefile.am            |   25 +-
 plugins/caldav/caldav-browse-server.c | 1341 +++++++++++++++++++++++++++++++++
 plugins/caldav/caldav-browse-server.h |   32 +
 plugins/caldav/caldav-source.c        |   47 ++
 4 files changed, 1436 insertions(+), 9 deletions(-)
---
diff --git a/plugins/caldav/Makefile.am b/plugins/caldav/Makefile.am
index 51e12ac..18c2a91 100644
--- a/plugins/caldav/Makefile.am
+++ b/plugins/caldav/Makefile.am
@@ -3,18 +3,25 @@
 plugin_DATA = org-gnome-evolution-caldav.eplug
 plugin_LTLIBRARIES = liborg-gnome-evolution-caldav.la
 
-liborg_gnome_evolution_caldav_la_CPPFLAGS =		\
-	$(AM_CPPFLAGS)					\
-	-I .						\
-	-I$(top_srcdir)	                                \
-	-DCALDAV_UIDIR=\""$(uidir)"\"			\
-	$(EVOLUTION_CALENDAR_CFLAGS)
-
-liborg_gnome_evolution_caldav_la_SOURCES = caldav-source.c
+liborg_gnome_evolution_caldav_la_CPPFLAGS =	\
+	$(AM_CPPFLAGS)				\
+	-I .					\
+	-I$(top_srcdir)				\
+	-DCALDAV_UIDIR=\""$(uidir)"\"		\
+	$(EVOLUTION_CALENDAR_CFLAGS)		\
+	$(LIBSOUP_CFLAGS)
+
+liborg_gnome_evolution_caldav_la_SOURCES =	\
+	caldav-source.c				\
+	caldav-browse-server.h			\
+	caldav-browse-server.c
 
 liborg_gnome_evolution_caldav_la_LIBADD = 	\
+	$(top_builddir)/e-util/libeutil.la	\
+	$(top_builddir)/widgets/misc/libemiscwidgets.la	\
 	$(EVOLUTION_CALENDAR_LIBS)		\
-	$(EPLUGIN_LIBS)		
+	$(EPLUGIN_LIBS)				\
+	$(LIBSOUP_LIBS)
 
 liborg_gnome_evolution_caldav_la_LDFLAGS = -module -avoid-version $(NO_UNDEFINED)
 
diff --git a/plugins/caldav/caldav-browse-server.c b/plugins/caldav/caldav-browse-server.c
new file mode 100644
index 0000000..8598cdb
--- /dev/null
+++ b/plugins/caldav/caldav-browse-server.c
@@ -0,0 +1,1341 @@
+/*
+ * caldav-browse-server.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) version 3.
+ *
+ * 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with the program; if not, see <http://www.gnu.org/licenses/>
+ *
+ *
+ * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
+ *
+ */
+
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <glib/gi18n-lib.h>
+#include <glib.h>
+#include <gtk/gtk.h>
+
+#include <libsoup/soup.h>
+#include <libxml/parser.h>
+#include <libxml/tree.h>
+#include <libxml/xpath.h>
+#include <libxml/xpathInternals.h>
+
+#include <libecal/e-cal.h>
+#include <libedataserver/e-proxy.h>
+#include <libedataserverui/e-cell-renderer-color.h>
+#include <libedataserverui/e-passwords.h>
+
+#include <e-util/e-dialog-utils.h>
+#include <widgets/misc/e-spinner.h>
+
+#include "caldav-browse-server.h"
+
+#define XC (xmlChar *)
+
+enum {
+	CALDAV_THREAD_SHOULD_SLEEP,
+	CALDAV_THREAD_SHOULD_WORK,
+	CALDAV_THREAD_SHOULD_DIE
+};
+
+enum {
+	COL_BOOL_IS_LOADED,
+	COL_STRING_HREF,
+	COL_BOOL_IS_CALENDAR,
+	COL_STRING_SUPPORTS,
+	COL_STRING_DISPLAYNAME,
+	COL_GDK_COLOR,
+	COL_BOOL_HAS_COLOR,
+	COL_BOOL_SENSITIVE
+};
+
+typedef void (*process_message_cb) (GObject *dialog, guint status_code, const gchar *msg_body, gpointer user_data);
+
+static void send_xml_message (xmlDocPtr doc, const gchar *msg_type, const gchar *url, GObject *dialog, process_message_cb cb, gpointer cb_user_data, const gchar *info);
+
+static gchar *
+xpath_get_string (xmlXPathContextPtr xpctx, const gchar *path_format, ...)
+{
+	gchar *res = NULL, *path, *tmp;
+	va_list args;
+	xmlXPathObjectPtr obj;
+
+	g_return_val_if_fail (xpctx != NULL, NULL);
+	g_return_val_if_fail (path_format != NULL, NULL);
+
+	va_start (args, path_format);
+	tmp = g_strdup_vprintf (path_format, args);
+	va_end (args);
+
+	if (1 || strchr (tmp, '@') == NULL) {
+		path = g_strconcat ("string(", tmp, ")", NULL);
+		g_free (tmp);
+	} else {
+		path = tmp;
+	}
+
+	obj = xmlXPathEvalExpression (XC path, xpctx);
+	g_free (path);
+
+	if (obj == NULL)
+		return NULL;
+
+	if (obj->type == XPATH_STRING)
+		res = g_strdup ((gchar *) obj->stringval);
+
+	xmlXPathFreeObject (obj);
+
+	return res;
+}
+
+static gboolean
+xpath_exists (xmlXPathContextPtr xpctx, xmlXPathObjectPtr *resobj, const gchar *path_format, ...)
+{
+	gchar *path;
+	va_list args;
+	xmlXPathObjectPtr obj;
+
+	g_return_val_if_fail (xpctx != NULL, FALSE);
+	g_return_val_if_fail (path_format != NULL, FALSE);
+
+	va_start (args, path_format);
+	path = g_strdup_vprintf (path_format, args);
+	va_end (args);
+
+	obj = xmlXPathEvalExpression (XC path, xpctx);
+	g_free (path);
+
+	if (obj && (obj->type != XPATH_NODESET || xmlXPathNodeSetGetLength (obj->nodesetval) == 0)) {
+		xmlXPathFreeObject (obj);
+		obj = NULL;
+	}
+
+	if (resobj)
+		*resobj = obj;
+	else if (obj != NULL)
+		xmlXPathFreeObject (obj);
+
+	return obj != NULL;
+}
+
+static gchar *
+change_url_path (const gchar *base_url, const gchar *new_path)
+{
+	SoupURI *suri;
+	gchar *url;
+
+	g_return_val_if_fail (base_url != NULL, NULL);
+	g_return_val_if_fail (new_path != NULL, NULL);
+
+	suri = soup_uri_new (base_url);
+	if (!suri)
+		return NULL;
+
+	soup_uri_set_path (suri, new_path);
+
+	url = soup_uri_to_string (suri, FALSE);
+
+	soup_uri_free (suri);
+
+	return url;
+}
+
+static void
+report_error (GObject *dialog, gboolean is_fatal, const gchar *msg)
+{
+	g_return_if_fail (dialog != NULL);
+	g_return_if_fail (GTK_IS_DIALOG (dialog));
+	g_return_if_fail (msg != NULL);
+
+	if (is_fatal) {
+		GtkWidget *content_area, *w;
+
+		content_area = gtk_dialog_get_content_area (GTK_DIALOG (dialog));
+
+		w = g_object_get_data (dialog, "caldav-info-label");
+		gtk_widget_hide (w);
+
+		w = g_object_get_data (dialog, "caldav-tree-sw");
+		gtk_widget_hide (w);
+
+		w = gtk_label_new (msg);
+		gtk_widget_show (w);
+		gtk_box_pack_start (GTK_BOX (content_area), w, TRUE, TRUE, 10);
+
+		w = g_object_get_data (dialog, "caldav-new-url-entry");
+		if (w)
+			gtk_entry_set_text (GTK_ENTRY (w), "");
+	} else {
+		GtkLabel *label = g_object_get_data (dialog, "caldav-info-label");
+
+		if (label)
+			gtk_label_set_text (label, msg);
+	}
+}
+
+static gboolean
+check_soup_status (GObject *dialog, guint status_code, const gchar *msg_body, gboolean is_fatal)
+{
+	gchar *msg;
+
+	if (status_code == 207)
+		return TRUE;
+
+	if (status_code == 401 || status_code == 403) {
+		msg = g_strdup (_("Authentication failed. Server requires correct login."));
+	} else if (status_code == 404) {
+		msg = g_strdup (_("Given URL cannot be found."));
+	} else {
+		const gchar *phrase = soup_status_get_phrase (status_code);
+
+		msg = g_strdup_printf (_("Server returned unexpected data.\n%d - %s"), status_code, phrase ? phrase : _("Unknown error"));
+	}
+
+	report_error (dialog, is_fatal, msg);
+
+	g_free (msg);
+
+	return FALSE;
+}
+
+struct test_exists_data {
+	const gchar *href;
+	gboolean exists;
+};
+
+static gboolean
+test_href_exists_cb (GtkTreeModel *model, GtkTreePath *path, GtkTreeIter *iter, gpointer user_data)
+{
+	struct test_exists_data *ted = user_data;
+	gchar *href = NULL;
+
+	g_return_val_if_fail (model != NULL, TRUE);
+	g_return_val_if_fail (iter != NULL, TRUE);
+	g_return_val_if_fail (ted != NULL, TRUE);
+	g_return_val_if_fail (ted->href != NULL, TRUE);
+
+	gtk_tree_model_get (model, iter, COL_STRING_HREF, &href, -1);
+
+	ted->exists = href && g_ascii_strcasecmp (href, ted->href) == 0;
+
+	g_free (href);
+
+	return ted->exists;
+}
+
+static void
+add_collection_node_to_tree (GtkTreeStore *store, GtkTreeIter *parent_iter, const gchar *href)
+{
+	SoupURI *suri;
+	const gchar *path;
+	GtkTreeIter iter, loading_iter;
+	struct test_exists_data ted;
+	gchar *displayname, **tmp;
+
+	g_return_if_fail (store != NULL);
+	g_return_if_fail (GTK_IS_TREE_STORE (store));
+	g_return_if_fail (href != NULL);
+
+	suri = soup_uri_new (href);
+	if (suri && suri->path && (*suri->path != '/' || strlen (suri->path) > 1))
+		href = suri->path;
+
+	ted.href = href;
+	ted.exists = FALSE;
+
+	gtk_tree_model_foreach (GTK_TREE_MODEL (store), test_href_exists_cb, &ted);
+
+	if (ted.exists) {
+		if (suri)
+			soup_uri_free (suri);
+		return;
+	}
+
+	path = href;
+	tmp = g_strsplit (path, "/", -1);
+
+	/* parent_iter is not set for the root folder node, where whole path is shown */
+	if (tmp && parent_iter) {
+		/* pick the last non-empty path part */
+		gint idx = 0;
+
+		while (tmp [idx]) {
+			idx++;
+		}
+
+		idx--;
+
+		while (idx >= 0 && !tmp [idx][0]) {
+			idx--;
+		}
+
+		if (idx >= 0)
+			path = tmp [idx];
+	}
+
+	displayname = soup_uri_decode (path);
+
+	gtk_tree_store_append (store, &iter, parent_iter);
+	gtk_tree_store_set (store, &iter,
+		COL_BOOL_IS_LOADED, FALSE,
+		COL_BOOL_IS_CALENDAR, FALSE,
+		COL_STRING_HREF, href,
+		COL_STRING_DISPLAYNAME, displayname ? displayname : path,
+		COL_BOOL_SENSITIVE, TRUE,
+		-1);
+
+	g_free (displayname);
+	g_strfreev (tmp);
+	if (suri)
+		soup_uri_free (suri);
+
+	/* not localized "Loading...", because will be removed on expand immediately */
+	gtk_tree_store_append (store, &loading_iter, &iter);
+	gtk_tree_store_set (store, &loading_iter,
+		COL_BOOL_IS_LOADED, FALSE,
+		COL_BOOL_IS_CALENDAR, FALSE,
+		COL_STRING_DISPLAYNAME, "Loading...",
+		COL_BOOL_SENSITIVE, FALSE,
+		-1);
+}
+
+/* called with "caldav-thread-mutex" unlocked; 'user_data' is parent tree iter, NULL for "User's calendars" */
+static void
+traverse_users_calendars_cb (GObject *dialog, guint status_code, const gchar *msg_body, gpointer user_data)
+{
+	xmlDocPtr doc;
+	xmlXPathContextPtr xpctx;
+	xmlXPathObjectPtr xpathObj;
+	GtkTreeIter *parent_iter = user_data, par_iter;
+
+	g_return_if_fail (dialog != NULL);
+	g_return_if_fail (GTK_IS_DIALOG (dialog));
+	g_return_if_fail (msg_body != NULL);
+
+	if (!check_soup_status (dialog, status_code, msg_body, TRUE))
+		return;
+
+	doc = xmlReadMemory (msg_body, strlen (msg_body), "response.xml", NULL, 0);
+	if (!doc) {
+		report_error (dialog, TRUE, _("Failed to parse server response."));
+		return;
+	}
+
+	xpctx = xmlXPathNewContext (doc);
+	xmlXPathRegisterNs (xpctx, XC "D", XC "DAV:");
+	xmlXPathRegisterNs (xpctx, XC "C", XC "urn:ietf:params:xml:ns:caldav");
+	xmlXPathRegisterNs (xpctx, XC "CS", XC "http://calendarserver.org/ns/";);
+	xmlXPathRegisterNs (xpctx, XC "IC", XC "http://apple.com/ns/ical/";);
+
+	xpathObj = xmlXPathEvalExpression (XC "/D:multistatus/D:response", xpctx);
+	if (xpathObj && xpathObj->type == XPATH_NODESET) {
+		GtkWidget *tree = g_object_get_data (G_OBJECT (dialog), "caldav-tree");
+		GtkTreeStore *store = GTK_TREE_STORE (gtk_tree_view_get_model (GTK_TREE_VIEW (tree)));
+		GtkTreeIter iter;
+		gint i, n;
+
+		n = xmlXPathNodeSetGetLength (xpathObj->nodesetval);
+		for (i = 0; i < n; i++) {
+			xmlXPathObjectPtr suppObj;
+			GString *supports;
+			gchar *href, *displayname, *color_str;
+			GdkColor color;
+			gchar *str;
+			guint status;
+			gboolean sensitive;
+
+			#define response(_x) "/D:multistatus/D:response[%d]/" _x
+			#define prop(_x) response ("D:propstat/D:prop/" _x)
+
+			str = xpath_get_string (xpctx, response ("D:propstat/D:status"), i + 1);
+			if (!str || !soup_headers_parse_status_line (str, NULL, &status, NULL) || status != 200) {
+				g_free (str);
+				continue;
+			}
+
+			g_free (str);
+
+			if (!xpath_exists (xpctx, NULL, prop ("D:resourcetype/C:calendar"), i + 1)) {
+				/* not a calendar node */
+
+				if (user_data != NULL && xpath_exists (xpctx, NULL, prop ("D:resourcetype/D:collection"), i + 1)) {
+					/* can be browseable, add node for loading */
+					href = xpath_get_string (xpctx, response ("D:href"), i + 1);
+					if (href && *href)
+						add_collection_node_to_tree (store, parent_iter, href);
+
+					g_free (href);
+				}
+				continue;
+			}
+
+			href = xpath_get_string (xpctx, response ("D:href"), i + 1);
+			if (!href || !*href) {
+				/* href should be there always */
+				g_free (href);
+				continue;
+			}
+
+			displayname = xpath_get_string (xpctx, prop ("D:displayname"), i + 1);
+			color_str = xpath_get_string (xpctx, prop ("IC:calendar-color"), i + 1);
+			if (color_str && !gdk_color_parse (color_str, &color)) {
+				g_free (color_str);
+				color_str = NULL;
+			}
+
+			sensitive = FALSE;
+			supports = NULL;
+			suppObj = NULL;
+			if (xpath_exists (xpctx, &suppObj, prop ("C:supported-calendar-component-set/C:comp"), i + 1)) {
+				if (suppObj->type == XPATH_NODESET) {
+					const gchar *source_type = g_object_get_data (G_OBJECT (dialog), "caldav-source-type");
+					gint j, szj = xmlXPathNodeSetGetLength (suppObj->nodesetval);
+
+					for (j = 0; j < szj; j++) {
+						gchar *comp = xpath_get_string (xpctx, prop ("C:supported-calendar-component-set/C:comp[%d]/@name"), i + 1, j + 1);
+
+						if (!comp)
+							continue;
+
+						if (!g_str_equal (comp, "VEVENT") && !g_str_equal (comp, "VTODO") && !g_str_equal (comp, "VJOURNAL")) {
+							g_free (comp);
+							continue;
+						}
+
+						/* this calendar source supports our type, thus can be selected */
+						sensitive = sensitive || (source_type && comp && g_str_equal (source_type, comp));
+
+						if (!supports)
+							supports = g_string_new ("");
+						else
+							g_string_append (supports, " ");
+
+						if (g_str_equal (comp, "VEVENT"))
+							g_string_append (supports, _("Events"));
+						else if (g_str_equal (comp, "VTODO"))
+							g_string_append (supports, _("Tasks"));
+						else if (g_str_equal (comp, "VJOURNAL"))
+							g_string_append (supports, _("Memos"));
+						
+						g_free (comp);
+					}
+				}
+
+				xmlXPathFreeObject (suppObj);
+			}
+
+			if (tree) {
+				g_return_if_fail (store != NULL);
+
+				if (!parent_iter) {
+					/* filling "User's calendars" node */
+					gtk_tree_store_append (store, &par_iter, NULL);
+					gtk_tree_store_set (store, &par_iter,
+						COL_BOOL_IS_LOADED, TRUE,
+						COL_BOOL_IS_CALENDAR, FALSE,
+						COL_STRING_DISPLAYNAME, _("User's calendars"),
+						COL_BOOL_SENSITIVE, TRUE,
+						-1);
+
+					parent_iter = &par_iter;
+				}
+
+				gtk_tree_store_append (store, &iter, parent_iter);
+				gtk_tree_store_set (store, &iter,
+					COL_BOOL_IS_LOADED, TRUE,
+					COL_BOOL_IS_CALENDAR, TRUE,
+					COL_STRING_HREF, href,
+					COL_STRING_SUPPORTS, supports ? supports->str : "",
+					COL_STRING_DISPLAYNAME, displayname && *displayname ? displayname : href,
+					COL_GDK_COLOR, color_str ? &color : NULL,
+					COL_BOOL_HAS_COLOR, color_str != NULL,
+					COL_BOOL_SENSITIVE, sensitive,
+					-1);
+			}
+
+			g_free (href);
+			g_free (displayname);
+			g_free (color_str);
+			if (supports)
+				g_string_free (supports, TRUE);
+		}
+
+		if (parent_iter) {
+			/* expand loaded node */
+			GtkTreePath *path;
+
+			path = gtk_tree_model_get_path (GTK_TREE_MODEL (store), parent_iter);
+			gtk_tree_view_expand_to_path (GTK_TREE_VIEW (tree), path);
+			gtk_tree_path_free (path);
+		}
+
+		if (user_data == NULL) {
+			/* it was checking for user's calendars, thus add node for browsing from the base url */
+			add_collection_node_to_tree (store, NULL, g_object_get_data (dialog, "caldav-base-url"));
+		}
+	}
+
+	if (xpathObj)
+		xmlXPathFreeObject (xpathObj);
+	xmlXPathFreeContext (xpctx);
+	xmlFreeDoc (doc);
+}
+
+static void
+fetch_folder_content (GObject *dialog, const gchar *relative_path, const GtkTreeIter *parent_iter, const gchar *op_info)
+{
+	xmlDocPtr doc;
+	xmlNodePtr root, node;
+	xmlNsPtr nsdav, nsc, nscs, nsical;
+	gchar *url;
+
+	g_return_if_fail (dialog != NULL);
+	g_return_if_fail (GTK_IS_DIALOG (dialog));
+	g_return_if_fail (relative_path != NULL);
+
+	doc = xmlNewDoc (XC "1.0");
+	root = xmlNewDocNode (doc, NULL, XC "propfind", NULL);
+
+	nsdav = xmlNewNs (root, XC "DAV:", XC "D");
+	nsc = xmlNewNs (root, XC "urn:ietf:params:xml:ns:caldav", XC "C");
+	nscs = xmlNewNs (root, XC "http://calendarserver.org/ns/";, XC "CS");
+	nsical = xmlNewNs (root, XC "http://apple.com/ns/ical/";, XC "IC");
+
+	xmlSetNs (root, nsdav);
+	xmlDocSetRootElement (doc, root);
+
+	node = xmlNewTextChild (root, nsdav, XC "prop", NULL);
+	xmlNewTextChild (node, nsdav, XC "displayname", NULL);
+	xmlNewTextChild (node, nsdav, XC "resourcetype", NULL);
+	xmlNewTextChild (node, nsc, XC "calendar-description", NULL);
+	xmlNewTextChild (node, nsc, XC "supported-calendar-component-set", NULL);
+	xmlNewTextChild (node, nscs, XC "getctag", NULL);
+	xmlNewTextChild (node, nsical, XC "calendar-color", NULL);
+
+	url = change_url_path (g_object_get_data (dialog, "caldav-base-url"), relative_path);
+	if (url) {
+		GtkTreeIter *par_iter = NULL;
+
+		if (parent_iter) {
+			gchar *key;
+
+			par_iter = g_new0 (GtkTreeIter, 1);
+			*par_iter = *parent_iter;
+
+			/* will be freed on dialog destroy */
+			key = g_strdup_printf ("caldav-to-free-%p", par_iter);
+			g_object_set_data_full (dialog, key, par_iter, g_free);
+			g_free (key);
+		}
+
+		send_xml_message (doc, "PROPFIND", url, G_OBJECT (dialog), traverse_users_calendars_cb, par_iter, op_info);
+	} else {
+		report_error (dialog, TRUE, _("Failed to get server URL."));
+	}
+
+	xmlFreeDoc (doc);
+
+	g_free (url);
+}
+
+/* called with "caldav-thread-mutex" unlocked; user_data is not NULL when called second time on principal */
+static void
+find_users_calendar_cb (GObject *dialog, guint status_code, const gchar *msg_body, gpointer user_data)
+{
+	xmlDocPtr doc;
+	xmlXPathContextPtr xpctx;
+	gchar *calendar_home_set, *url;
+
+	g_return_if_fail (dialog != NULL);
+	g_return_if_fail (GTK_IS_DIALOG (dialog));
+	g_return_if_fail (msg_body != NULL);
+
+	if (!check_soup_status (dialog, status_code, msg_body, TRUE))
+		return;
+
+	doc = xmlReadMemory (msg_body, strlen (msg_body), "response.xml", NULL, 0);
+	if (!doc) {
+		report_error (dialog, TRUE, _("Failed to parse server response."));
+		return;
+	}
+
+	xpctx = xmlXPathNewContext (doc);
+	xmlXPathRegisterNs (xpctx, XC "D", XC "DAV:");
+	xmlXPathRegisterNs (xpctx, XC "C", XC "urn:ietf:params:xml:ns:caldav");
+
+	calendar_home_set = xpath_get_string (xpctx, "/D:multistatus/D:response/D:propstat/D:prop/C:calendar-home-set/D:href");
+	if (user_data == NULL && (!calendar_home_set || !*calendar_home_set)) {
+		g_free (calendar_home_set);
+
+		calendar_home_set = xpath_get_string (xpctx, "/D:multistatus/D:response/D:propstat/D:prop/D:current-user-principal/D:href");
+		if (!calendar_home_set || !*calendar_home_set) {
+			g_free (calendar_home_set);
+			calendar_home_set = xpath_get_string (xpctx, "/D:multistatus/D:response/D:propstat/D:prop/D:principal-URL/D:href");
+		}
+
+		xmlXPathFreeContext (xpctx);
+		xmlFreeDoc (doc);
+
+		if (calendar_home_set && *calendar_home_set) {
+			xmlNodePtr root, node;
+			xmlNsPtr nsdav, nsc;
+
+			/* ask on principal user's calendar home address */
+			doc = xmlNewDoc (XC "1.0");
+			root = xmlNewDocNode (doc, NULL, XC "propfind", NULL);
+			nsc = xmlNewNs (root, XC "urn:ietf:params:xml:ns:caldav", XC "C");
+			nsdav = xmlNewNs (root, XC "DAV:", XC "D");
+			xmlSetNs (root, nsdav);
+			xmlDocSetRootElement (doc, root);
+
+			node = xmlNewTextChild (root, nsdav, XC "prop", NULL);
+			xmlNewTextChild (node, nsdav, XC "current-user-principal", NULL);
+			xmlNewTextChild (node, nsc, XC "calendar-home-set", NULL);
+
+			url = change_url_path (g_object_get_data (dialog, "caldav-base-url"), calendar_home_set);
+			if (url) {
+				send_xml_message (doc, "PROPFIND", url, dialog, find_users_calendar_cb, GINT_TO_POINTER (1), _("Searching for user's calendars..."));
+			} else {
+				report_error (dialog, TRUE, _("Failed to get server URL."));
+			}
+
+			xmlFreeDoc (doc);
+
+			g_free (url);
+			g_free (calendar_home_set);
+
+			return;
+		}
+	} else {
+		xmlXPathFreeContext (xpctx);
+		xmlFreeDoc (doc);
+	}
+
+	if (!calendar_home_set || !*calendar_home_set) {
+		report_error (dialog, FALSE, _("Could not find any user calendar."));
+	} else {
+		fetch_folder_content (dialog, calendar_home_set, NULL, _("Searching for user's calendars..."));
+	}
+
+	g_free (calendar_home_set);
+}
+
+static void
+redirect_handler (SoupMessage *msg, gpointer user_data)
+{
+	if (SOUP_STATUS_IS_REDIRECTION (msg->status_code)) {
+		SoupSession *soup_session = user_data;
+		SoupURI *new_uri;
+		const gchar *new_loc;
+
+		new_loc = soup_message_headers_get (msg->response_headers, "Location");
+		if (!new_loc)
+			return;
+
+		new_uri = soup_uri_new_with_base (soup_message_get_uri (msg), new_loc);
+		if (!new_uri) {
+			soup_message_set_status_full (msg,
+						      SOUP_STATUS_MALFORMED,
+						      "Invalid Redirect URL");
+			return;
+		}
+
+		soup_message_set_uri (msg, new_uri);
+		soup_session_requeue_message (soup_session, msg);
+
+		soup_uri_free (new_uri);
+	}
+}
+
+static void
+send_and_handle_redirection (SoupSession *soup_session, SoupMessage *msg)
+{
+	soup_message_set_flags (msg, SOUP_MESSAGE_NO_REDIRECT);
+	soup_message_add_header_handler (msg, "got_body", "Location", G_CALLBACK (redirect_handler), soup_session);
+	soup_session_send_message (soup_session, msg);
+}
+
+static gpointer
+caldav_browse_server_thread (gpointer data)
+{
+	GObject *dialog = data;
+	GCond *cond;
+	GMutex *mutex;
+	SoupSession *session;
+	gint task;
+
+	g_return_val_if_fail (dialog != NULL, NULL);
+	g_return_val_if_fail (GTK_IS_DIALOG (dialog), NULL);
+
+	cond = g_object_get_data (dialog, "caldav-thread-cond");
+	mutex = g_object_get_data (dialog, "caldav-thread-mutex");
+	session = g_object_get_data (dialog, "caldav-session");
+
+	g_return_val_if_fail (cond != NULL, NULL);
+	g_return_val_if_fail (mutex != NULL, NULL);
+	g_return_val_if_fail (session != NULL, NULL);
+
+	g_mutex_lock (mutex);
+
+	while (task = GPOINTER_TO_INT (g_object_get_data (dialog, "caldav-thread-task")), task != CALDAV_THREAD_SHOULD_DIE) {
+		if (task == CALDAV_THREAD_SHOULD_SLEEP) {
+			g_cond_wait (cond, mutex);
+		} else if (task == CALDAV_THREAD_SHOULD_WORK) {
+			SoupMessage *message;
+
+			g_object_set_data (dialog, "caldav-thread-task", GINT_TO_POINTER (CALDAV_THREAD_SHOULD_SLEEP));
+
+			message = g_object_get_data (dialog, "caldav-thread-message");
+			if (!message) {
+				g_warning ("%s: No message to send", G_STRFUNC);
+				continue;
+			}
+
+			g_object_set_data (dialog, "caldav-thread-message-sent", NULL);
+
+			g_object_ref (message);
+
+			g_mutex_unlock (mutex);
+			send_and_handle_redirection (session, message);
+			g_mutex_lock (mutex);
+
+			g_object_set_data (dialog, "caldav-thread-message-sent", message);
+
+			g_object_unref (message);
+		}
+	}
+
+	soup_session_abort (session);
+	g_object_set_data (dialog, "caldav-thread-poll", GINT_TO_POINTER (0));
+
+	g_object_set_data (dialog, "caldav-thread-cond", NULL);
+	g_object_set_data (dialog, "caldav-thread-mutex", NULL);
+	g_object_set_data (dialog, "caldav-session", NULL);
+
+	g_mutex_unlock (mutex);
+
+	g_cond_free (cond);
+	g_mutex_free (mutex);
+	g_object_unref (session);
+
+	return NULL;
+}
+
+static void
+soup_authenticate (SoupSession *session, SoupMessage *msg, SoupAuth *auth, gboolean retrying, gpointer data)
+{
+	GObject *dialog = data;
+	const gchar *username, *password;
+
+	g_return_if_fail (dialog != NULL);
+	g_return_if_fail (GTK_IS_DIALOG (dialog));
+
+	username = g_object_get_data (dialog, "caldav-username");
+	password = g_object_get_data (dialog, "caldav-password");
+
+	if (!username || !*username || (retrying && (!password || !*password)))
+		return;
+
+	if (!password || !*password || retrying) {
+		gchar *pass, *prompt, *add = NULL;
+
+		if (retrying && msg && msg->reason_phrase) {
+			add = g_strdup_printf (_("Previous attempt failed: %s"), msg->reason_phrase);
+		} else if (retrying && msg && msg->status_code) {
+			add = g_strdup_printf (_("Previous attempt failed with code %d"), msg->status_code);
+		}
+
+		prompt = g_strdup_printf (_("Enter password for user <b>%s</b> on server <b>%s</b>"), username, soup_auth_get_host (auth));
+		if (add) {
+			gchar *tmp;
+
+			tmp = g_strconcat (prompt, "\n", add, NULL);
+
+			g_free (prompt);
+			prompt = tmp;
+		}
+
+		pass = e_passwords_ask_password (_("Enter password"),
+			"Calendar", "caldav-search-server", prompt,
+			E_PASSWORDS_REMEMBER_NEVER | E_PASSWORDS_DISABLE_REMEMBER | E_PASSWORDS_SECRET,
+			NULL, GTK_WINDOW (dialog));
+
+		g_object_set_data_full (G_OBJECT (dialog), "caldav-password", pass, g_free);
+
+		password = pass;
+
+		g_free (prompt);
+		g_free (add);
+	}
+
+	if (!retrying || password)
+		soup_auth_authenticate (auth, username, password);
+}
+
+/* the dialog is about to die, so cancel any pending operations to close the thread too */
+static void
+dialog_response_cb (GObject *dialog, gint response_id, gpointer user_data)
+{
+	GCond *cond;
+	GMutex *mutex;
+
+	g_return_if_fail (dialog == user_data);
+	g_return_if_fail (GTK_IS_DIALOG (dialog));
+
+	cond = g_object_get_data (dialog, "caldav-thread-cond");
+	mutex = g_object_get_data (dialog, "caldav-thread-mutex");
+
+	g_return_if_fail (mutex != NULL);
+
+	g_mutex_lock (mutex);
+	g_object_set_data (dialog, "caldav-thread-task", GINT_TO_POINTER (CALDAV_THREAD_SHOULD_DIE));
+
+	if (cond)
+		g_cond_signal (cond);
+	g_mutex_unlock (mutex);
+}
+
+static gboolean
+check_message (GtkWindow *dialog, SoupMessage *message, const gchar *url)
+{
+	g_return_val_if_fail (dialog != NULL, FALSE);
+	g_return_val_if_fail (GTK_IS_DIALOG (dialog), FALSE);
+
+	if (!message)
+		e_notice (GTK_WINDOW (dialog), GTK_MESSAGE_ERROR, _("Cannot create soup message for URL '%s'"), url ? url : "[null]");
+
+	return message != NULL;
+}
+
+static void
+indicate_busy (GObject *dialog, gboolean is_busy)
+{
+	GtkWidget *spinner = g_object_get_data (dialog, "caldav-spinner");
+
+	gtk_widget_set_sensitive (g_object_get_data (dialog, "caldav-tree"), !is_busy);
+
+	if (is_busy) {
+		gtk_widget_show (spinner);
+	} else {
+		gtk_widget_hide (spinner);
+	}
+}
+
+struct poll_data {
+	GObject *dialog;
+	SoupMessage *message;
+	process_message_cb cb;
+	gpointer cb_user_data;
+};
+
+static gboolean
+poll_for_message_sent_cb (gpointer data)
+{
+	struct poll_data *pd = data;
+	GMutex *mutex;
+	SoupMessage *sent_message;
+	gboolean again = TRUE;
+	guint status_code = -1;
+	gchar *msg_body = NULL;
+
+	g_return_val_if_fail (data != NULL, FALSE);
+
+	mutex = g_object_get_data (pd->dialog, "caldav-thread-mutex");
+	/* thread most likely finished already */
+	if (!mutex)
+		return FALSE;
+
+	g_mutex_lock (mutex);
+	sent_message = g_object_get_data (pd->dialog, "caldav-thread-message-sent");
+	again = sent_message == NULL;
+
+	if (sent_message == pd->message) {
+		GtkLabel *label = g_object_get_data (pd->dialog, "caldav-info-label");
+
+		if (label)
+			gtk_label_set_text (label, "");
+
+		g_object_ref (pd->message);
+		g_object_set_data (pd->dialog, "caldav-thread-message-sent", NULL);
+		g_object_set_data (pd->dialog, "caldav-thread-message", NULL);
+
+		if (pd->cb) {
+			status_code = pd->message->status_code;
+			msg_body = g_strndup (pd->message->response_body->data, pd->message->response_body->length);
+		}
+
+		g_object_unref (pd->message);
+	}
+
+	if (!again) {
+		indicate_busy (pd->dialog, FALSE);
+		g_object_set_data (pd->dialog, "caldav-thread-poll", GINT_TO_POINTER (0));
+	}
+
+	g_mutex_unlock (mutex);
+
+	if (!again && pd->cb && msg_body) {
+		(*pd->cb) (pd->dialog, status_code, msg_body, pd->cb_user_data);
+	}
+
+	g_free (msg_body);
+
+	return again;
+}
+
+static void
+send_xml_message (xmlDocPtr doc, const gchar *msg_type, const gchar *url, GObject *dialog, process_message_cb cb, gpointer cb_user_data, const gchar *info)
+{
+	GCond *cond;
+	GMutex *mutex;
+	SoupSession *session;
+	SoupMessage *message;
+	xmlOutputBufferPtr buf;
+	guint poll_id;
+	struct poll_data *pd;
+
+	g_return_if_fail (doc != NULL);
+	g_return_if_fail (msg_type != NULL);
+	g_return_if_fail (url != NULL);
+	g_return_if_fail (dialog != NULL);
+	g_return_if_fail (GTK_IS_DIALOG (dialog));
+
+	cond = g_object_get_data (dialog, "caldav-thread-cond");
+	mutex = g_object_get_data (dialog, "caldav-thread-mutex");
+	session = g_object_get_data (dialog, "caldav-session");
+
+	g_return_if_fail (cond != NULL);
+	g_return_if_fail (mutex != NULL);
+	g_return_if_fail (session != NULL);
+
+	message = soup_message_new (msg_type, url);
+	if (!check_message (GTK_WINDOW (dialog), message, url))
+		return;
+
+	buf = xmlAllocOutputBuffer (NULL);
+	xmlNodeDumpOutput (buf, doc, xmlDocGetRootElement (doc), 0, 1, NULL);
+	xmlOutputBufferFlush (buf);
+
+	soup_message_headers_append (message->request_headers, "User-Agent", "Evolution/" VERSION);
+	soup_message_headers_append (message->request_headers, "Depth", "1");
+	soup_message_set_request (message, "application/xml", SOUP_MEMORY_COPY, (const gchar *) buf->buffer->content, buf->buffer->use);
+
+	/* Clean up the memory */
+	xmlOutputBufferClose (buf);
+
+	g_mutex_lock (mutex);
+
+	soup_session_abort (session);
+
+	g_object_set_data (dialog, "caldav-thread-task", GINT_TO_POINTER (CALDAV_THREAD_SHOULD_WORK));
+	g_object_set_data (dialog, "caldav-thread-message-sent", NULL);
+	g_object_set_data_full (dialog, "caldav-thread-message", message, g_object_unref);
+
+	g_cond_signal (cond);
+
+	pd = g_new0 (struct poll_data, 1);
+	pd->dialog = dialog;
+	pd->message = message;
+	pd->cb = cb;
+	pd->cb_user_data = cb_user_data;
+
+	indicate_busy (dialog, TRUE);
+
+	if (info) {
+		GtkLabel *label = g_object_get_data (dialog, "caldav-info-label");
+
+		if (label)
+			gtk_label_set_text (label, info);
+	}
+
+	/* polling for caldav-thread-message-sent because want to update UI, which is only possible from main thread */
+	poll_id = g_timeout_add_full (G_PRIORITY_DEFAULT, 250, poll_for_message_sent_cb, pd, g_free);
+
+	g_object_set_data_full (dialog, "caldav-thread-poll", GINT_TO_POINTER (poll_id), (GDestroyNotify) g_source_remove);
+
+	g_mutex_unlock (mutex);
+}
+
+static void
+url_entry_changed (GtkEntry *entry, GObject *dialog)
+{
+	const gchar *url;
+
+	g_return_if_fail (dialog != NULL);
+	g_return_if_fail (GTK_IS_DIALOG (dialog));
+
+	url = gtk_entry_get_text (entry);
+
+	gtk_dialog_set_response_sensitive (GTK_DIALOG (dialog), GTK_RESPONSE_OK, url && *url);
+}
+
+static void
+tree_selection_changed_cb (GtkTreeSelection *selection, GtkEntry *url_entry)
+{
+	gboolean ok = FALSE;
+	GtkTreeModel *model = NULL;
+	GtkTreeIter iter;
+
+	g_return_if_fail (selection != NULL);
+	g_return_if_fail (url_entry != NULL);
+
+	if (gtk_tree_selection_get_selected (selection, &model, &iter)) {
+		gchar *href = NULL;
+
+		gtk_tree_model_get (model, &iter,
+			COL_BOOL_IS_CALENDAR, &ok,
+			COL_STRING_HREF, &href,
+			-1);
+
+		ok = ok && href && *href;
+
+		if (ok)
+			gtk_entry_set_text (url_entry, href);
+
+		g_free (href);
+	}
+
+	if (!ok)
+		gtk_entry_set_text (url_entry, "");
+}
+
+static void
+tree_row_expanded_cb (GtkTreeView *tree, GtkTreeIter *iter, GtkTreePath *path, GObject *dialog)
+{
+	GtkTreeModel *model;
+	gboolean is_loaded = TRUE;
+	gchar *href = NULL;
+
+	g_return_if_fail (tree != NULL);
+	g_return_if_fail (dialog != NULL);
+	g_return_if_fail (GTK_IS_DIALOG (dialog));
+	g_return_if_fail (iter != NULL);
+
+	model = gtk_tree_view_get_model (tree);
+	gtk_tree_model_get (model, iter,
+		COL_BOOL_IS_LOADED, &is_loaded,
+		COL_STRING_HREF, &href,
+		-1);
+
+	if (!is_loaded) {
+		/* unset unloaded flag */
+		gtk_tree_store_set (GTK_TREE_STORE (model), iter, COL_BOOL_IS_LOADED, TRUE, -1);
+
+		/* remove the "Loading..." node */
+		while (gtk_tree_model_iter_has_child (model, iter)) {
+			GtkTreeIter child;
+
+			if (!gtk_tree_model_iter_nth_child (model, &child, iter, 0) ||
+			    !gtk_tree_store_remove (GTK_TREE_STORE (model), &child))
+					break;
+		}
+
+		/* fetch content */
+		fetch_folder_content (dialog, href, iter, _("Searching folder content..."));
+	}
+
+	g_free (href);
+}
+
+static void
+init_dialog (GtkDialog *dialog, GtkWidget **new_url_entry, const gchar *url, const gchar *username, gint source_type)
+{
+	GtkBox *content_area;
+	GtkWidget *label, *info_box, *spinner, *info_label;
+	GtkWidget *tree, *scrolled_window;
+	GtkTreeStore *store;
+	GtkTreeSelection *selection;
+	SoupSession *session;
+	EProxy *proxy;
+	SoupURI *proxy_uri = NULL;
+	GThread *thread;
+	GError *error = NULL;
+	GMutex *thread_mutex;
+	GCond *thread_cond;
+	const gchar *source_type_str;
+	GtkCellRenderer *renderer;
+	GtkTreeViewColumn *column;
+
+	g_return_if_fail (dialog != NULL);
+	g_return_if_fail (GTK_IS_DIALOG (dialog));
+	g_return_if_fail (new_url_entry != NULL);
+	g_return_if_fail (url != NULL);
+
+	content_area = GTK_BOX (gtk_dialog_get_content_area (dialog));
+	g_return_if_fail (content_area != NULL);
+
+	gtk_window_set_default_size (GTK_WINDOW (dialog), 300, 240);
+	gtk_container_set_border_width (GTK_CONTAINER (dialog), 12);
+
+	*new_url_entry = gtk_entry_new ();
+	gtk_box_pack_start (content_area, *new_url_entry, FALSE, FALSE, 0);
+
+	g_signal_connect (G_OBJECT (*new_url_entry), "changed", G_CALLBACK (url_entry_changed), dialog);
+
+	g_object_set_data (G_OBJECT (dialog), "caldav-new-url-entry", *new_url_entry);
+
+	label = gtk_label_new (_("List of available calendars:"));
+	gtk_misc_set_alignment (GTK_MISC (label), 0.0, 0.5);
+	gtk_box_pack_start (content_area, label, FALSE, FALSE, 0);
+
+	store = gtk_tree_store_new (8,
+		G_TYPE_BOOLEAN,  /* COL_BOOL_IS_LOADED     */
+		G_TYPE_STRING,   /* COL_STRING_HREF        */
+		G_TYPE_BOOLEAN,  /* COL_BOOL_IS_CALENDAR   */
+		G_TYPE_STRING,   /* COL_STRING_SUPPORTS    */
+		G_TYPE_STRING,   /* COL_STRING_DISPLAYNAME */
+		GDK_TYPE_COLOR,  /* COL_GDK_COLOR          */
+		G_TYPE_BOOLEAN,  /* COL_BOOL_HAS_COLOR     */
+		G_TYPE_BOOLEAN); /* COL_BOOL_SENSITIVE     */
+
+	scrolled_window = gtk_scrolled_window_new (NULL, NULL);
+	gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled_window), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
+
+	tree = gtk_tree_view_new_with_model (GTK_TREE_MODEL (store));
+	gtk_scrolled_window_add_with_viewport (GTK_SCROLLED_WINDOW (scrolled_window), tree);
+	gtk_box_pack_start (content_area, scrolled_window, TRUE, TRUE, 0);
+
+	g_object_set_data (G_OBJECT (dialog), "caldav-tree", tree);
+	g_object_set_data (G_OBJECT (dialog), "caldav-tree-sw", scrolled_window);
+
+	renderer = e_cell_renderer_color_new ();
+	column = gtk_tree_view_get_column (GTK_TREE_VIEW (tree), gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (tree), -1, _("Name"), renderer, "color", COL_GDK_COLOR, "visible", COL_BOOL_HAS_COLOR, "sensitive", COL_BOOL_SENSITIVE, NULL) - 1);
+
+	renderer = gtk_cell_renderer_text_new ();
+	gtk_cell_layout_pack_start (
+		GTK_CELL_LAYOUT (column), renderer, TRUE);
+	gtk_cell_layout_set_attributes (
+		GTK_CELL_LAYOUT (column), renderer,
+		"text", COL_STRING_DISPLAYNAME,
+		"sensitive", COL_BOOL_SENSITIVE,
+		NULL);
+
+	renderer = gtk_cell_renderer_text_new ();
+	gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (tree), -1, _("Supports"), renderer, "text", COL_STRING_SUPPORTS, "sensitive", COL_BOOL_SENSITIVE, NULL);
+
+	/*renderer = gtk_cell_renderer_text_new ();
+	gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (tree), -1, _("href"), renderer, "text", COL_STRING_HREF, "sensitive", COL_BOOL_SENSITIVE, NULL);*/
+
+	selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (tree));
+	g_signal_connect (selection, "changed", G_CALLBACK (tree_selection_changed_cb), *new_url_entry);
+
+	g_signal_connect (tree, "row-expanded", G_CALLBACK (tree_row_expanded_cb), dialog);
+
+	info_box = gtk_hbox_new (FALSE, 2);
+
+	spinner = e_spinner_new_spinning_small_shown ();
+	gtk_box_pack_start (GTK_BOX (info_box), spinner, FALSE, FALSE, 0);
+	g_object_set_data (G_OBJECT (dialog), "caldav-spinner", spinner);
+
+	info_label = gtk_label_new ("");
+	gtk_misc_set_alignment (GTK_MISC (info_label), 0.0, 0.5);
+	gtk_box_pack_start (GTK_BOX (info_box), info_label, FALSE, FALSE, 0);
+	g_object_set_data (G_OBJECT (dialog), "caldav-info-label", info_label);
+
+	gtk_box_pack_start (content_area, info_box, FALSE, FALSE, 0);
+
+	gtk_widget_show_all (GTK_WIDGET (content_area));
+	gtk_widget_hide (*new_url_entry);
+	gtk_widget_hide (spinner);
+
+	session = soup_session_sync_new ();
+	if (g_getenv ("CALDAV_DEBUG") != NULL) {
+		SoupLogger *logger;
+
+		logger = soup_logger_new (SOUP_LOGGER_LOG_BODY, 100 * 1024 * 1024);
+		soup_session_add_feature (session, SOUP_SESSION_FEATURE (logger));
+		g_object_unref (logger);
+	}
+
+	proxy = e_proxy_new ();
+	e_proxy_setup_proxy (proxy);
+
+	/* use proxy if necessary */
+	if (e_proxy_require_proxy_for_uri (proxy, url)) {
+		proxy_uri = e_proxy_peek_uri_for (proxy, url);
+	}
+
+	g_object_set (session, SOUP_SESSION_PROXY_URI, proxy_uri, NULL);
+	g_object_unref (proxy);
+
+	g_signal_connect (session, "authenticate", G_CALLBACK (soup_authenticate), dialog);
+
+	switch (source_type) {
+	default:
+	case E_CAL_SOURCE_TYPE_EVENT:
+		source_type_str = "VEVENT";
+		break;
+	case E_CAL_SOURCE_TYPE_TODO:
+		source_type_str = "VTODO";
+		break;
+	case E_CAL_SOURCE_TYPE_JOURNAL:
+		source_type_str = "VJOURNAL";
+		break;
+	}
+
+	g_object_set_data_full (G_OBJECT (dialog), "caldav-source-type", g_strdup (source_type_str), g_free);
+	g_object_set_data_full (G_OBJECT (dialog), "caldav-base-url", g_strdup (url), g_free);
+	g_object_set_data_full (G_OBJECT (dialog), "caldav-username", g_strdup (username), g_free);
+	g_object_set_data_full (G_OBJECT (dialog), "caldav-session", session, NULL); /* it is freed at the end of thread life */
+
+	thread_mutex = g_mutex_new ();
+	thread_cond = g_cond_new ();
+
+	g_object_set_data (G_OBJECT (dialog), "caldav-thread-task", GINT_TO_POINTER (CALDAV_THREAD_SHOULD_SLEEP));
+	g_object_set_data_full (G_OBJECT (dialog), "caldav-thread-mutex", thread_mutex, NULL); /* it is freed at the end of thread life */
+	g_object_set_data_full (G_OBJECT (dialog), "caldav-thread-cond", thread_cond, NULL); /* it is freed at the end of thread life */
+
+	/* create thread at the end, to have all properties on the dialog set */
+	thread = g_thread_create (caldav_browse_server_thread, dialog, TRUE, &error);
+
+	if (error || !thread) {
+		e_notice (GTK_WINDOW (dialog), GTK_MESSAGE_ERROR, _("Failed to create thread: %s"), error ? error->message : _("Unknown error"));
+		if (error)
+			g_error_free (error);
+	} else {
+		xmlDocPtr doc;
+		xmlNodePtr root, node;
+		xmlNsPtr nsdav, nsc;
+
+		g_object_set_data_full (G_OBJECT (dialog), "caldav-thread", thread, (GDestroyNotify) g_thread_join);
+
+		doc = xmlNewDoc (XC "1.0");
+		root = xmlNewDocNode (doc, NULL, XC "propfind", NULL);
+		nsc = xmlNewNs (root, XC "urn:ietf:params:xml:ns:caldav", XC "C");
+		nsdav = xmlNewNs (root, XC "DAV:", XC "D");
+		xmlSetNs (root, nsdav);
+		xmlDocSetRootElement (doc, root);
+
+		node = xmlNewTextChild (root, nsdav, XC "prop", NULL);
+		xmlNewTextChild (node, nsdav, XC "current-user-principal", NULL);
+		xmlNewTextChild (node, nsdav, XC "principal-URL", NULL);
+		xmlNewTextChild (node, nsc, XC "calendar-home-set", NULL);
+
+		send_xml_message (doc, "PROPFIND", url, G_OBJECT (dialog), find_users_calendar_cb, NULL, _("Searching for user's calendars..."));
+
+		xmlFreeDoc (doc);
+	}
+
+	g_signal_connect (dialog, "response", G_CALLBACK (dialog_response_cb), dialog);
+
+	url_entry_changed (GTK_ENTRY (*new_url_entry), G_OBJECT (dialog));
+}
+
+static gchar *
+prepare_url (const gchar *server_url, gboolean use_ssl)
+{
+	gchar *url;
+	gint len;
+
+	g_return_val_if_fail (server_url != NULL, NULL);
+	g_return_val_if_fail (*server_url, NULL);
+
+	if (g_str_has_prefix (server_url, "caldav://")) {
+		url = g_strconcat (use_ssl ? "https://"; : "http://";, server_url + 9, NULL);
+	} else {
+		url = g_strdup (server_url);
+	}
+
+	if (url) {
+		SoupURI *suri = soup_uri_new (url);
+
+		/* properly encode uri */
+		if (suri && suri->path) {
+			gchar *tmp = soup_uri_encode (suri->path, NULL);
+			gchar *path = soup_uri_normalize (tmp, "/");
+
+			soup_uri_set_path (suri, path);
+
+			g_free (tmp);
+			g_free (path);
+			g_free (url);
+
+			url = soup_uri_to_string (suri, FALSE);
+		} else {
+			g_free (url);
+			soup_uri_free (suri);
+			return NULL;
+		}
+
+		soup_uri_free (suri);
+	}
+
+	/* remove trailing slashes... */
+	len = strlen (url);
+	while (len--) {
+		if (url[len] == '/') {
+			url[len] = '\0';
+		} else {
+			break;
+		}
+	}
+
+	/* ...and append exactly one slash */
+	if (url && *url) {
+		gchar *tmp = url;
+
+		url = g_strconcat (url, "/", NULL);
+
+		g_free (tmp);
+	} else {
+		g_free (url);
+		url = NULL;
+	}
+
+	return url;
+}
+
+gchar *
+caldav_browse_server (GtkWindow *parent, const gchar *server_url, const gchar *username, gboolean use_ssl, gint source_type)
+{
+	GtkWidget *dialog, *new_url_entry;
+	gchar *url, *new_url = NULL;
+
+	g_return_val_if_fail (server_url != NULL, NULL);
+
+	url = prepare_url (server_url, use_ssl);
+
+	if (!url || !*url) {
+		e_notice (parent, GTK_MESSAGE_ERROR, _("Server URL '%s' is not a valid URL"), server_url);
+		g_free (url);
+		return NULL;
+	}
+
+	dialog = gtk_dialog_new_with_buttons (
+			_("Browse for a CalDAV calendar"),
+			parent,
+			GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT | GTK_DIALOG_NO_SEPARATOR,
+			GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
+			GTK_STOCK_OK, GTK_RESPONSE_OK,
+			NULL);
+
+	new_url_entry = NULL;
+	init_dialog (GTK_DIALOG (dialog), &new_url_entry, url, username, source_type);
+
+	if (new_url_entry && gtk_dialog_run (GTK_DIALOG (dialog)) == GTK_RESPONSE_OK) {
+		const gchar *nu = gtk_entry_get_text (GTK_ENTRY (new_url_entry));
+
+		if (nu && *nu)
+			new_url = change_url_path (server_url, nu);
+	}
+
+	gtk_widget_destroy (dialog);
+
+	g_free (url);
+
+	return new_url;
+}
diff --git a/plugins/caldav/caldav-browse-server.h b/plugins/caldav/caldav-browse-server.h
new file mode 100644
index 0000000..5c7cde6
--- /dev/null
+++ b/plugins/caldav/caldav-browse-server.h
@@ -0,0 +1,32 @@
+/*
+ * caldav-browse-server.h
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) version 3.
+ *
+ * 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with the program; if not, see <http://www.gnu.org/licenses/>
+ *
+ *
+ * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
+ *
+ */
+
+#ifndef CALDAV_BROWSE_SERVER_H
+#define CALDAV_BROWSE_SERVER_H
+
+#include <glib.h>
+#include <gtk/gtk.h>
+
+/* Opens a window with a list of available calendars for a given server;
+   Returns server URL of a calendar user chose, or NULL to let it be as is. */
+gchar *caldav_browse_server (GtkWindow *parent, const gchar *server_url, const gchar *username, gboolean use_ssl, gint source_type);
+
+#endif /* CALDAV_BROWSE_SERVER_H */
diff --git a/plugins/caldav/caldav-source.c b/plugins/caldav/caldav-source.c
index f5d8f59..4821cbf 100644
--- a/plugins/caldav/caldav-source.c
+++ b/plugins/caldav/caldav-source.c
@@ -38,6 +38,8 @@
 
 #include <string.h>
 
+#include "caldav-browse-server.h"
+
 #define d(x)
 
 /*****************************************************************************/
@@ -303,6 +305,39 @@ combobox_changed (GtkComboBox *combobox, ESource *source)
 	g_free (refresh_str);
 }
 
+static void
+browse_cal_clicked_cb (GtkButton *button, gpointer user_data)
+{
+	GtkEntry *url, *username;
+	GtkToggleButton *ssl;
+	gchar *new_url;
+
+	g_return_if_fail (button != NULL);
+
+	url = g_object_get_data (G_OBJECT (button), "caldav-url");
+	username = g_object_get_data (G_OBJECT (button), "caldav-username");
+	ssl = g_object_get_data (G_OBJECT (button), "caldav-ssl");
+
+	g_return_if_fail (url != NULL);
+	g_return_if_fail (GTK_IS_ENTRY (url));
+	g_return_if_fail (username != NULL);
+	g_return_if_fail (GTK_IS_ENTRY (username));
+	g_return_if_fail (ssl != NULL);
+	g_return_if_fail (GTK_IS_TOGGLE_BUTTON (ssl));
+
+	new_url = caldav_browse_server (
+		GTK_WINDOW (gtk_widget_get_toplevel (GTK_WIDGET (button))),
+		gtk_entry_get_text (url),
+		gtk_entry_get_text (username),
+		gtk_toggle_button_get_active (ssl),
+		GPOINTER_TO_INT (user_data));
+
+	if (new_url) {
+		gtk_entry_set_text (url, new_url);
+		g_free (new_url);
+	}
+}
+
 GtkWidget *
 oge_caldav  (EPlugin                    *epl,
 	     EConfigHookItemFactoryData *data)
@@ -318,6 +353,7 @@ oge_caldav  (EPlugin                    *epl,
 	GtkWidget    *widget;
 	GtkWidget    *luser;
 	GtkWidget    *user;
+	GtkWidget    *browse_cal;
 	GtkWidget    *label, *hbox, *spin, *combobox;
 	gchar         *uri;
 	gchar         *username;
@@ -429,6 +465,17 @@ oge_caldav  (EPlugin                    *epl,
         g_free (uri);
 	g_free (username);
 
+	browse_cal = gtk_button_new_with_mnemonic (_("Brows_e server for a calendar"));
+	gtk_widget_show (browse_cal);
+	gtk_table_attach (GTK_TABLE (parent), browse_cal, 1, 2, row, row + 1, GTK_FILL, 0, 0, 0);
+
+	g_object_set_data (G_OBJECT (browse_cal), "caldav-url", location);
+	g_object_set_data (G_OBJECT (browse_cal), "caldav-username", user);
+	g_object_set_data (G_OBJECT (browse_cal), "caldav-ssl", cssl);
+	g_signal_connect  (G_OBJECT (browse_cal), "clicked", G_CALLBACK (browse_cal_clicked_cb), GINT_TO_POINTER (t->source_type));
+
+	row++;
+
 	/* add refresh option */
 	label = gtk_label_new_with_mnemonic (_("Re_fresh:"));
 	gtk_widget_show (label);