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7949397958
gnome-shell/browser-plugin/browser-plugin.c
Jasper St. Pierre 7949397958 shellDBus: Add a real error reporting system to InstallExtensionRemote 
Instead of using the 'extension-state-changed' signal to relay errors,
use DBus's native error mechanism to inform the method caller that the
call has failed. This requires making the method actually asynchronous
so that we don't block the browser, which is stuck waiting for a reply
from the browser plugin. To ensure this, we need to modify the browser
plugin API to ensure its extesion installation method is asynchronous.

Additionally, this lets us remove the awful, broken hacks that we used
when a user clicked the "Cancel" button, replacing it by a DBus return
value.

https://bugzilla.gnome.org/show_bug.cgi?id=679099
2012-07-02 18:29:56 -04:00

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* Copyright (C) 2011 Red Hat
*
* 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 Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
* Authors:
* Jasper St. Pierre <jstpierre@mecheye.net>
* Giovanni Campagna <scampa.giovanni@gmail.com>
*/
#include <string.h>
#define XP_UNIX 1
#include "npapi/npapi.h"
#include "npapi/npruntime.h"
#include "npapi/npfunctions.h"
#include <glib.h>
#include <gio/gio.h>
#include <json-glib/json-glib.h>
#define ORIGIN "extensions.gnome.org"
#define PLUGIN_NAME "Gnome Shell Integration"
#define PLUGIN_DESCRIPTION "This plugin provides integration with Gnome Shell " \
"for live extension enabling and disabling. " \
"It can be used only by extensions.gnome.org"
#define PLUGIN_MIME_STRING "application/x-gnome-shell-integration::Gnome Shell Integration Dummy Content-Type";
#define PLUGIN_API_VERSION 5
typedef struct {
GDBusProxy *proxy;
} PluginData;
static NPNetscapeFuncs funcs;
static inline gchar *
get_string_property (NPP instance,
NPObject *obj,
const char *name)
{
NPVariant result = { NPVariantType_Void };
NPString result_str;
gchar *result_copy;
result_copy = NULL;
if (!funcs.getproperty (instance, obj,
funcs.getstringidentifier (name),
&result))
goto out;
if (!NPVARIANT_IS_STRING (result))
goto out;
result_str = NPVARIANT_TO_STRING (result);
result_copy = g_strndup (result_str.UTF8Characters, result_str.UTF8Length);
out:
funcs.releasevariantvalue (&result);
return result_copy;
}
static gboolean
check_origin_and_protocol (NPP instance)
{
gboolean ret = FALSE;
NPError error;
NPObject *window = NULL;
NPVariant document = { NPVariantType_Void };
NPVariant location = { NPVariantType_Void };
gchar *hostname = NULL;
gchar *protocol = NULL;
error = funcs.getvalue (instance, NPNVWindowNPObject, &window);
if (error != NPERR_NO_ERROR)
goto out;
if (!funcs.getproperty (instance, window,
funcs.getstringidentifier ("document"),
&document))
goto out;
if (!NPVARIANT_IS_OBJECT (document))
goto out;
if (!funcs.getproperty (instance, NPVARIANT_TO_OBJECT (document),
funcs.getstringidentifier ("location"),
&location))
goto out;
if (!NPVARIANT_IS_OBJECT (location))
goto out;
hostname = get_string_property (instance,
NPVARIANT_TO_OBJECT (location),
"hostname");
if (g_strcmp0 (hostname, ORIGIN))
{
g_debug ("origin does not match, is %s",
hostname);
goto out;
}
protocol = get_string_property (instance,
NPVARIANT_TO_OBJECT (location),
"protocol");
if (g_strcmp0 (protocol, "https:") != 0)
{
g_debug ("protocol does not match, is %s",
protocol);
goto out;
}
ret = TRUE;
out:
g_free (protocol);
g_free (hostname);
funcs.releasevariantvalue (&location);
funcs.releasevariantvalue (&document);
if (window != NULL)
funcs.releaseobject (window);
return ret;
}
/* =============== public entry points =================== */
NPError
NP_Initialize(NPNetscapeFuncs *pfuncs, NPPluginFuncs *plugin)
{
/* global initialization routine, called once when plugin
is loaded */
g_type_init ();
g_debug ("plugin loaded");
memcpy (&funcs, pfuncs, sizeof (funcs));
plugin->size = sizeof(NPPluginFuncs);
plugin->newp = NPP_New;
plugin->destroy = NPP_Destroy;
plugin->getvalue = NPP_GetValue;
plugin->setwindow = NPP_SetWindow;
return NPERR_NO_ERROR;
}
NPError
NP_Shutdown(void)
{
return NPERR_NO_ERROR;
}
const char*
NP_GetMIMEDescription(void)
{
return PLUGIN_MIME_STRING;
}
NPError
NP_GetValue(void *instance,
NPPVariable variable,
void *value)
{
switch (variable) {
case NPPVpluginNameString:
*(char**)value = PLUGIN_NAME;
break;
case NPPVpluginDescriptionString:
*(char**)value = PLUGIN_DESCRIPTION;
break;
default:
;
}
return NPERR_NO_ERROR;
}
NPError
NPP_New(NPMIMEType mimetype,
NPP instance,
uint16_t mode,
int16_t argc,
char **argn,
char **argv,
NPSavedData *saved)
{
/* instance initialization function */
PluginData *data;
GError *error = NULL;
g_debug ("plugin created");
if (!check_origin_and_protocol (instance))
return NPERR_GENERIC_ERROR;
data = g_slice_new (PluginData);
instance->pdata = data;
data->proxy = g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SESSION,
G_DBUS_PROXY_FLAGS_NONE,
NULL, /* interface info */
"org.gnome.Shell",
"/org/gnome/Shell",
"org.gnome.Shell.Extensions",
NULL, /* GCancellable */
&error);
if (!data->proxy)
{
/* ignore error if the shell is not running, otherwise warn */
if (error->domain != G_DBUS_ERROR ||
error->code != G_DBUS_ERROR_NAME_HAS_NO_OWNER)
{
g_warning ("Failed to set up Shell proxy: %s", error->message);
}
g_clear_error (&error);
return NPERR_GENERIC_ERROR;
}
g_debug ("plugin created successfully");
return NPERR_NO_ERROR;
}
NPError
NPP_Destroy(NPP instance,
NPSavedData **saved)
{
/* instance finalization function */
PluginData *data = instance->pdata;
g_debug ("plugin destroyed");
g_object_unref (data->proxy);
g_slice_free (PluginData, data);
return NPERR_NO_ERROR;
}
/* =================== scripting interface =================== */
typedef struct {
NPObject parent;
NPP instance;
GDBusProxy *proxy;
GSettings *settings;
NPObject *listener;
NPObject *restart_listener;
gint signal_id;
guint watch_name_id;
} PluginObject;
static void
on_shell_signal (GDBusProxy *proxy,
gchar *sender_name,
gchar *signal_name,
GVariant *parameters,
gpointer user_data)
{
PluginObject *obj = user_data;
if (strcmp (signal_name, "ExtensionStatusChanged") == 0)
{
gchar *uuid;
gint32 status;
gchar *error;
NPVariant args[3];
NPVariant result = { NPVariantType_Void };
g_variant_get (parameters, "(sis)", &uuid, &status, &error);
STRINGZ_TO_NPVARIANT (uuid, args[0]);
INT32_TO_NPVARIANT (status, args[1]);
STRINGZ_TO_NPVARIANT (error, args[2]);
funcs.invokeDefault (obj->instance, obj->listener,
args, 3, &result);
funcs.releasevariantvalue (&result);
g_free (uuid);
g_free (error);
}
}
static void
on_shell_appeared (GDBusConnection *connection,
const gchar *name,
const gchar *name_owner,
gpointer user_data)
{
PluginObject *obj = (PluginObject*) user_data;
if (obj->restart_listener)
{
NPVariant result = { NPVariantType_Void };
funcs.invokeDefault (obj->instance, obj->restart_listener,
NULL, 0, &result);
funcs.releasevariantvalue (&result);
}
}
#define SHELL_SCHEMA "org.gnome.shell"
#define ENABLED_EXTENSIONS_KEY "enabled-extensions"
static NPObject *
plugin_object_allocate (NPP instance,
NPClass *klass)
{
PluginData *data = instance->pdata;
PluginObject *obj = g_slice_new0 (PluginObject);
obj->instance = instance;
obj->proxy = g_object_ref (data->proxy);
obj->settings = g_settings_new (SHELL_SCHEMA);
obj->signal_id = g_signal_connect (obj->proxy, "g-signal",
G_CALLBACK (on_shell_signal), obj);
obj->watch_name_id = g_bus_watch_name (G_BUS_TYPE_SESSION,
"org.gnome.Shell",
G_BUS_NAME_WATCHER_FLAGS_NONE,
on_shell_appeared,
NULL,
obj,
NULL);
g_debug ("plugin object created");
return (NPObject*)obj;
}
static void
plugin_object_deallocate (NPObject *npobj)
{
PluginObject *obj = (PluginObject*)npobj;
g_signal_handler_disconnect (obj->proxy, obj->signal_id);
g_object_unref (obj->proxy);
if (obj->listener)
funcs.releaseobject (obj->listener);
if (obj->watch_name_id)
g_bus_unwatch_name (obj->watch_name_id);
g_debug ("plugin object destroyed");
g_slice_free (PluginObject, obj);
}
static inline gboolean
uuid_is_valid (NPString string)
{
gsize i;
for (i = 0; i < string.UTF8Length; i++)
{
gchar c = string.UTF8Characters[i];
if (c < 32 || c >= 127)
return FALSE;
switch (c)
{
case '&':
case '<':
case '>':
case '/':
case '\\':
return FALSE;
default:
break;
}
}
return TRUE;
}
static gboolean
jsonify_variant (GVariant *variant,
NPVariant *result)
{
gboolean ret;
GVariant *real_value;
JsonNode *root;
JsonGenerator *generator;
gsize json_length;
gchar *json;
gchar *buffer;
ret = TRUE;
/* DBus methods can return multiple values,
* but we're only interested in the first. */
g_variant_get (variant, "(@*)", &real_value);
root = json_gvariant_serialize (real_value);
generator = json_generator_new ();
json_generator_set_root (generator, root);
json = json_generator_to_data (generator, &json_length);
buffer = funcs.memalloc (json_length + 1);
if (!buffer)
{
ret = FALSE;
goto out;
}
strcpy (buffer, json);
STRINGN_TO_NPVARIANT (buffer, json_length, *result);
out:
g_variant_unref (variant);
g_variant_unref (real_value);
json_node_free (root);
g_free (json);
return ret;
}
static gboolean
parse_args (const gchar *format_str,
uint32_t argc,
const NPVariant *argv,
...)
{
va_list args;
gsize i;
gboolean ret = FALSE;
if (strlen (format_str) != argc)
return FALSE;
va_start (args, argv);
for (i = 0; format_str[i]; i++)
{
gpointer arg_location;
const NPVariant arg = argv[i];
arg_location = va_arg (args, gpointer);
switch (format_str[i])
{
case 'u':
{
NPString string;
if (!NPVARIANT_IS_STRING (arg))
goto out;
string = NPVARIANT_TO_STRING (arg);
if (!uuid_is_valid (string))
goto out;
*(gchar **) arg_location = g_strndup (string.UTF8Characters, string.UTF8Length);
}
break;
case 'b':
if (!NPVARIANT_IS_BOOLEAN (arg))
goto out;
*(gboolean *) arg_location = NPVARIANT_TO_BOOLEAN (arg);
break;
case 'o':
if (!NPVARIANT_IS_OBJECT (arg))
goto out;
*(NPObject **) arg_location = NPVARIANT_TO_OBJECT (arg);
}
}
ret = TRUE;
out:
va_end (args);
return ret;
}
static gboolean
plugin_list_extensions (PluginObject *obj,
uint32_t argc,
const NPVariant *args,
NPVariant *result)
{
GError *error = NULL;
GVariant *res;
res = g_dbus_proxy_call_sync (obj->proxy,
"ListExtensions",
NULL, /* parameters */
G_DBUS_CALL_FLAGS_NONE,
-1, /* timeout */
NULL, /* cancellable */
&error);
if (!res)
{
g_warning ("Failed to retrieve extension list: %s", error->message);
g_error_free (error);
return FALSE;
}
return jsonify_variant (res, result);
}
static gboolean
plugin_enable_extension (PluginObject *obj,
uint32_t argc,
const NPVariant *argv,
NPVariant *result)
{
gboolean ret;
gchar *uuid;
gboolean enabled;
gsize length;
gchar **uuids;
const gchar **new_uuids;
if (!parse_args ("ub", argc, argv, &uuid, &enabled))
return FALSE;
uuids = g_settings_get_strv (obj->settings, ENABLED_EXTENSIONS_KEY);
length = g_strv_length (uuids);
if (enabled)
{
new_uuids = g_new (const gchar *, length + 2); /* New key, NULL */
memcpy (new_uuids, uuids, length * sizeof (*new_uuids));
new_uuids[length] = uuid;
new_uuids[length + 1] = NULL;
}
else
{
gsize i = 0, j = 0;
new_uuids = g_new (const gchar *, length);
for (i = 0; i < length; i ++)
{
if (g_str_equal (uuids[i], uuid))
continue;
new_uuids[j] = uuids[i];
j++;
}
new_uuids[j] = NULL;
}
ret = g_settings_set_strv (obj->settings,
ENABLED_EXTENSIONS_KEY,
new_uuids);
g_strfreev (uuids);
g_free (new_uuids);
g_free (uuid);
return ret;
}
typedef struct _AsyncClosure AsyncClosure;
struct _AsyncClosure {
PluginObject *obj;
NPObject *callback;
NPObject *errback;
};
static void
install_extension_cb (GObject *proxy,
GAsyncResult *async_res,
gpointer user_data)
{
AsyncClosure *async_closure = (AsyncClosure *) user_data;
GError *error = NULL;
GVariant *res;
NPVariant args[1];
NPVariant result = { NPVariantType_Void };
NPObject *callback;
res = g_dbus_proxy_call_finish (G_DBUS_PROXY (proxy), async_res, &error);
if (res == NULL)
{
if (g_dbus_error_is_remote_error (error))
g_dbus_error_strip_remote_error (error);
STRINGZ_TO_NPVARIANT (error->message, args[0]);
callback = async_closure->errback;
}
else
{
char *string_result;
g_variant_get (res, "(&s)", &string_result);
STRINGZ_TO_NPVARIANT (string_result, args[0]);
callback = async_closure->callback;
}
funcs.invokeDefault (async_closure->obj->instance,
callback, args, 1, &result);
funcs.releasevariantvalue (&result);
funcs.releaseobject (async_closure->callback);
funcs.releaseobject (async_closure->errback);
g_slice_free (AsyncClosure, async_closure);
}
static gboolean
plugin_install_extension (PluginObject *obj,
uint32_t argc,
const NPVariant *argv,
NPVariant *result)
{
gchar *uuid;
NPObject *callback, *errback;
AsyncClosure *async_closure;
if (!parse_args ("uoo", argc, argv, &uuid, &callback, &errback))
return FALSE;
async_closure = g_slice_new (AsyncClosure);
async_closure->obj = obj;
async_closure->callback = funcs.retainobject (callback);
async_closure->errback = funcs.retainobject (errback);
g_dbus_proxy_call (obj->proxy,
"InstallRemoteExtension",
g_variant_new ("(s)", uuid),
G_DBUS_CALL_FLAGS_NONE,
-1, /* timeout */
NULL, /* cancellable */
install_extension_cb,
async_closure);
g_free (uuid);
return TRUE;
}
static gboolean
plugin_uninstall_extension (PluginObject *obj,
uint32_t argc,
const NPVariant *argv,
NPVariant *result)
{
GError *error = NULL;
GVariant *res;
gchar *uuid;
if (!parse_args ("u", argc, argv, &uuid))
return FALSE;
res = g_dbus_proxy_call_sync (obj->proxy,
"UninstallExtension",
g_variant_new ("(s)", uuid),
G_DBUS_CALL_FLAGS_NONE,
-1, /* timeout */
NULL, /* cancellable */
&error);
g_free (uuid);
if (!res)
{
g_warning ("Failed to uninstall extension: %s", error->message);
g_error_free (error);
return FALSE;
}
return jsonify_variant (res, result);
}
static gboolean
plugin_get_info (PluginObject *obj,
uint32_t argc,
const NPVariant *argv,
NPVariant *result)
{
GError *error = NULL;
GVariant *res;
gchar *uuid;
if (!parse_args ("u", argc, argv, &uuid))
return FALSE;
res = g_dbus_proxy_call_sync (obj->proxy,
"GetExtensionInfo",
g_variant_new ("(s)", uuid),
G_DBUS_CALL_FLAGS_NONE,
-1, /* timeout */
NULL, /* cancellable */
&error);
g_free (uuid);
if (!res)
{
g_warning ("Failed to retrieve extension metadata: %s", error->message);
g_error_free (error);
return FALSE;
}
return jsonify_variant (res, result);
}
static gboolean
plugin_get_errors (PluginObject *obj,
uint32_t argc,
const NPVariant *argv,
NPVariant *result)
{
GError *error = NULL;
GVariant *res;
gchar *uuid;
if (!parse_args ("u", argc, argv, &uuid))
return FALSE;
res = g_dbus_proxy_call_sync (obj->proxy,
"GetExtensionErrors",
g_variant_new ("(s)", uuid),
G_DBUS_CALL_FLAGS_NONE,
-1, /* timeout */
NULL, /* cancellable */
&error);
if (!res)
{
g_warning ("Failed to retrieve errors: %s", error->message);
g_error_free (error);
return FALSE;
}
return jsonify_variant (res, result);
}
static gboolean
plugin_launch_extension_prefs (PluginObject *obj,
uint32_t argc,
const NPVariant *argv,
NPVariant *result)
{
gchar *uuid;
if (!parse_args ("u", argc, argv, &uuid))
return FALSE;
g_dbus_proxy_call (obj->proxy,
"LaunchExtensionPrefs",
g_variant_new ("(s)", uuid),
G_DBUS_CALL_FLAGS_NONE,
-1, /* timeout */
NULL, /* cancellable */
NULL, /* callback */
NULL /* user_data */);
return TRUE;
}
static int
plugin_get_api_version (PluginObject *obj,
NPVariant *result)
{
INT32_TO_NPVARIANT (PLUGIN_API_VERSION, *result);
return TRUE;
}
static gboolean
plugin_get_shell_version (PluginObject *obj,
NPVariant *result)
{
GVariant *res;
const gchar *version;
gsize length;
gchar *buffer;
gboolean ret;
ret = TRUE;
res = g_dbus_proxy_get_cached_property (obj->proxy,
"ShellVersion");
if (res == NULL)
{
g_warning ("Failed to grab shell version.");
version = "-1";
}
else
{
g_variant_get (res, "&s", &version);
}
length = strlen (version);
buffer = funcs.memalloc (length + 1);
if (!buffer)
{
ret = FALSE;
goto out;
}
strcpy (buffer, version);
STRINGN_TO_NPVARIANT (buffer, length, *result);
out:
if (res)
g_variant_unref (res);
return ret;
}
#define METHODS \
METHOD (list_extensions) \
METHOD (get_info) \
METHOD (enable_extension) \
METHOD (install_extension) \
METHOD (uninstall_extension) \
METHOD (get_errors) \
METHOD (launch_extension_prefs) \
/* */
#define METHOD(x) \
static NPIdentifier x##_id;
METHODS
#undef METHOD
static NPIdentifier api_version_id;
static NPIdentifier shell_version_id;
static NPIdentifier onextension_changed_id;
static NPIdentifier onrestart_id;
static bool
plugin_object_has_method (NPObject *npobj,
NPIdentifier name)
{
#define METHOD(x) (name == (x##_id)) ||
/* expands to (name == list_extensions_id) || FALSE; */
return METHODS FALSE;
#undef METHOD
}
static bool
plugin_object_invoke (NPObject *npobj,
NPIdentifier name,
const NPVariant *argv,
uint32_t argc,
NPVariant *result)
{
PluginObject *obj;
g_debug ("invoking plugin object method");
obj = (PluginObject*) npobj;
VOID_TO_NPVARIANT (*result);
#define METHOD(x) \
if (name == x##_id) \
return plugin_##x (obj, argc, argv, result);
METHODS
#undef METHOD
return FALSE;
}
static bool
plugin_object_has_property (NPObject *npobj,
NPIdentifier name)
{
return (name == onextension_changed_id ||
name == onrestart_id ||
name == api_version_id ||
name == shell_version_id);
}
static bool
plugin_object_get_property (NPObject *npobj,
NPIdentifier name,
NPVariant *result)
{
PluginObject *obj;
if (!plugin_object_has_property (npobj, name))
return FALSE;
obj = (PluginObject*) npobj;
if (name == api_version_id)
return plugin_get_api_version (obj, result);
else if (name == shell_version_id)
return plugin_get_shell_version (obj, result);
else if (name == onextension_changed_id)
{
if (obj->listener)
OBJECT_TO_NPVARIANT (obj->listener, *result);
else
NULL_TO_NPVARIANT (*result);
}
else if (name == onrestart_id)
{
if (obj->restart_listener)
OBJECT_TO_NPVARIANT (obj->restart_listener, *result);
else
NULL_TO_NPVARIANT (*result);
}
return TRUE;
}
static bool
plugin_object_set_callback (NPObject **listener,
const NPVariant *value)
{
if (!NPVARIANT_IS_OBJECT (*value) && !NPVARIANT_IS_NULL (*value))
return FALSE;
if (*listener)
funcs.releaseobject (*listener);
*listener = NULL;
if (NPVARIANT_IS_OBJECT (*value))
{
*listener = NPVARIANT_TO_OBJECT (*value);
funcs.retainobject (*listener);
}
return TRUE;
}
static bool
plugin_object_set_property (NPObject *npobj,
NPIdentifier name,
const NPVariant *value)
{
PluginObject *obj;
obj = (PluginObject *)npobj;
if (name == onextension_changed_id)
return plugin_object_set_callback (&obj->listener, value);
if (name == onrestart_id)
return plugin_object_set_callback (&obj->restart_listener, value);
return FALSE;
}
static NPClass plugin_class = {
NP_CLASS_STRUCT_VERSION,
plugin_object_allocate,
plugin_object_deallocate,
NULL, /* invalidate */
plugin_object_has_method,
plugin_object_invoke,
NULL, /* invoke default */
plugin_object_has_property,
plugin_object_get_property,
plugin_object_set_property,
NULL, /* remove property */
NULL, /* enumerate */
NULL, /* construct */
};
static void
init_methods_and_properties (void)
{
/* this is the JS public API; it is manipulated through NPIdentifiers for speed */
api_version_id = funcs.getstringidentifier ("apiVersion");
shell_version_id = funcs.getstringidentifier ("shellVersion");
get_info_id = funcs.getstringidentifier ("getExtensionInfo");
list_extensions_id = funcs.getstringidentifier ("listExtensions");
enable_extension_id = funcs.getstringidentifier ("setExtensionEnabled");
install_extension_id = funcs.getstringidentifier ("installExtension");
uninstall_extension_id = funcs.getstringidentifier ("uninstallExtension");
get_errors_id = funcs.getstringidentifier ("getExtensionErrors");
launch_extension_prefs_id = funcs.getstringidentifier ("launchExtensionPrefs");
onrestart_id = funcs.getstringidentifier ("onshellrestart");
onextension_changed_id = funcs.getstringidentifier ("onchange");
}
NPError
NPP_GetValue(NPP instance,
NPPVariable variable,
void *value)
{
g_debug ("NPP_GetValue called");
switch (variable) {
case NPPVpluginScriptableNPObject:
g_debug ("creating scriptable object");
init_methods_and_properties ();
*(NPObject**)value = funcs.createobject (instance, &plugin_class);
break;
case NPPVpluginNeedsXEmbed:
*(bool *)value = TRUE;
break;
default:
;
}
return NPERR_NO_ERROR;
}
/* Opera tries to call NPP_SetWindow without checking the
* NULL pointer beforehand. */
NPError
NPP_SetWindow(NPP instance,
NPWindow *window)
{
return NPERR_NO_ERROR;
}
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