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gnome-shell/browser-plugin/browser-plugin.c
Jasper St. Pierre ab6a7773ce browser-plugin: Make sure to use the UTF8Length parameter 
Some plugin hosts may have junk after the UTF8Characters that we need to strip
off. No current browsers that I know of do this, but it still helps to be
correct.
2011-12-04 10:31:04 -05:00

837 lines
21 KiB
C
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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 1
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 (document))
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_debug ("plugin loaded");
memcpy (&funcs, pfuncs, sizeof (funcs));
plugin->size = sizeof(NPPluginFuncs);
plugin->newp = NPP_New;
plugin->destroy = NPP_Destroy;
plugin->getvalue = NPP_GetValue;
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",
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;
NPObject *listener;
gint signal_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;
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 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->signal_id = g_signal_connect (obj->proxy, "g-signal",
G_CALLBACK (on_shell_signal), obj);
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);
g_debug ("plugin object destroyed");
g_slice_free (PluginObject, obj);
}
static NPIdentifier api_version_id;
static NPIdentifier shell_version_id;
static NPIdentifier get_info_id;
static NPIdentifier list_extensions_id;
static NPIdentifier enable_extension_id;
static NPIdentifier install_extension_id;
static NPIdentifier uninstall_extension_id;
static NPIdentifier onextension_changed_id;
static NPIdentifier get_errors_id;
static bool
plugin_object_has_method (NPObject *npobj,
NPIdentifier name)
{
return (name == get_info_id ||
name == list_extensions_id ||
name == enable_extension_id ||
name == install_extension_id ||
name == uninstall_extension_id ||
name == get_errors_id);
}
static inline gboolean
uuid_is_valid (const gchar *uuid)
{
gsize i;
for (i = 0; uuid[i]; i ++)
{
gchar c = uuid[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
plugin_list_extensions (PluginObject *obj,
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,
NPString uuid,
gboolean enabled)
{
gchar *uuid_str = g_strndup (uuid.UTF8Characters, uuid.UTF8Length);
if (!uuid_is_valid (uuid_str))
return FALSE;
g_dbus_proxy_call (obj->proxy,
(enabled ? "EnableExtension" : "DisableExtension"),
g_variant_new ("(s)", uuid_str),
G_DBUS_CALL_FLAGS_NONE,
-1, /* timeout */
NULL, /* cancellable */
NULL, /* callback */
NULL /* user_data */);
g_free (uuid_str);
return TRUE;
}
static gboolean
plugin_install_extension (PluginObject *obj,
NPString uuid,
NPString version_tag)
{
gchar *uuid_str = g_strndup (uuid.UTF8Characters, uuid.UTF8Length);
if (!uuid_is_valid (uuid_str))
return FALSE;
g_dbus_proxy_call (obj->proxy,
"InstallRemoteExtension",
g_variant_new ("(ss)",
uuid_str,
version_tag.UTF8Characters),
G_DBUS_CALL_FLAGS_NONE,
-1, /* timeout */
NULL, /* cancellable */
NULL, /* callback */
NULL /* user_data */);
g_free (uuid_str);
return TRUE;
}
static gboolean
plugin_uninstall_extension (PluginObject *obj,
NPString uuid,
NPVariant *result)
{
GError *error = NULL;
GVariant *res;
gchar *uuid_str;
uuid_str = g_strndup (uuid.UTF8Characters, uuid.UTF8Length);
if (!uuid_is_valid (uuid_str))
return FALSE;
res = g_dbus_proxy_call_sync (obj->proxy,
"UninstallExtension",
g_variant_new ("(s)",
uuid_str),
G_DBUS_CALL_FLAGS_NONE,
-1, /* timeout */
NULL, /* cancellable */
&error);
g_free (uuid_str);
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,
NPString uuid,
NPVariant *result)
{
GError *error = NULL;
GVariant *res;
gchar *uuid_str;
uuid_str = g_strndup (uuid.UTF8Characters, uuid.UTF8Length);
if (!uuid_is_valid (uuid_str))
return FALSE;
res = g_dbus_proxy_call_sync (obj->proxy,
"GetExtensionInfo",
g_variant_new ("(s)", uuid_str),
G_DBUS_CALL_FLAGS_NONE,
-1, /* timeout */
NULL, /* cancellable */
&error);
g_free (uuid_str);
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,
NPString uuid,
NPVariant *result)
{
GError *error = NULL;
GVariant *res;
gchar *uuid_str;
uuid_str = g_strndup (uuid.UTF8Characters, uuid.UTF8Length);
if (!uuid_is_valid (uuid_str))
return FALSE;
res = g_dbus_proxy_call_sync (obj->proxy,
"GetExtensionErrors",
g_variant_new ("(s)", uuid_str),
G_DBUS_CALL_FLAGS_NONE,
-1, /* timeout */
NULL, /* cancellable */
&error);
g_free (uuid_str);
if (!res)
{
g_warning ("Failed to retrieve errors: %s", error->message);
g_error_free (error);
return FALSE;
}
return jsonify_variant (res, result);
}
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:
g_variant_unref (res);
return ret;
}
static bool
plugin_object_invoke (NPObject *npobj,
NPIdentifier name,
const NPVariant *args,
uint32_t argc,
NPVariant *result)
{
PluginObject *obj;
g_debug ("invoking plugin object method");
obj = (PluginObject*) npobj;
VOID_TO_NPVARIANT (*result);
if (!plugin_object_has_method (npobj, name))
return FALSE;
if (name == list_extensions_id)
return plugin_list_extensions (obj, result);
else if (name == get_info_id)
{
if (!NPVARIANT_IS_STRING(args[0])) return FALSE;
return plugin_get_info (obj, NPVARIANT_TO_STRING(args[0]), result);
}
else if (name == enable_extension_id)
{
if (!NPVARIANT_IS_STRING(args[0])) return FALSE;
if (!NPVARIANT_IS_BOOLEAN(args[1])) return FALSE;
return plugin_enable_extension (obj,
NPVARIANT_TO_STRING(args[0]),
NPVARIANT_TO_BOOLEAN(args[1]));
}
else if (name == install_extension_id)
{
if (!NPVARIANT_IS_STRING(args[0])) return FALSE;
if (!NPVARIANT_IS_STRING(args[1])) return FALSE;
return plugin_install_extension (obj,
NPVARIANT_TO_STRING(args[0]),
NPVARIANT_TO_STRING(args[1]));
}
else if (name == uninstall_extension_id)
{
if (!NPVARIANT_IS_STRING(args[0])) return FALSE;
return plugin_uninstall_extension (obj,
NPVARIANT_TO_STRING(args[0]),
result);
}
else if (name == get_errors_id)
{
if (!NPVARIANT_IS_STRING(args[0])) return FALSE;
return plugin_get_errors (obj,
NPVARIANT_TO_STRING(args[0]),
result);
}
return TRUE;
}
static bool
plugin_object_has_property (NPObject *npobj,
NPIdentifier name)
{
return (name == onextension_changed_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);
}
return TRUE;
}
static bool
plugin_object_set_property (NPObject *npobj,
NPIdentifier name,
const NPVariant *value)
{
PluginObject *obj;
if (!plugin_object_has_property (npobj, name))
return FALSE;
if (name == onextension_changed_id)
{
obj = (PluginObject*) npobj;
if (obj->listener)
funcs.releaseobject (obj->listener);
obj->listener = NULL;
if (NPVARIANT_IS_OBJECT (*value))
{
obj->listener = NPVARIANT_TO_OBJECT (*value);
funcs.retainobject (obj->listener);
return TRUE;
}
else if (NPVARIANT_IS_NULL (*value))
return TRUE;
}
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");
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;
}
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