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/**
* @file llcommandhandler.cpp
* @brief Central registry for text-driven "commands", most of
* which manipulate user interface. For example, the command
* "agent (uuid) about" will open the UI for an avatar's profile.
*
* $LicenseInfo:firstyear=2007&license=viewergpl$
*
* Copyright (c) 2007-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at
* http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#include "llviewerprecompiledheaders.h"
#include "llcommandhandler.h"
#include "llnotificationsutil.h"
// system includes
#include <boost/tokenizer.hpp>
#define THROTTLE_PERIOD 15 // required secs between throttled commands
//---------------------------------------------------------------------------
// Underlying registry for command handlers, not directly accessible.
//---------------------------------------------------------------------------
struct LLCommandHandlerInfo
{
LLCommandHandler::EUntrustedAccess mUntrustedBrowserAccess;
LLCommandHandler* mHandler; // safe, all of these are static objects
};
class LLCommandHandlerRegistry
{
public:
static LLCommandHandlerRegistry& instance();
void add(const char* cmd,
LLCommandHandler::EUntrustedAccess untrusted_access,
LLCommandHandler* handler);
bool dispatch(const std::string& cmd,
const LLSD& params,
const LLSD& query_map,
LLMediaCtrl* web,
bool trusted_browser);
private:
std::map<std::string, LLCommandHandlerInfo> mMap;
};
// static
LLCommandHandlerRegistry& LLCommandHandlerRegistry::instance()
{
// Force this to be initialized on first call, because we're going
// to be adding items to the std::map before main() and we can't
// rely on a global being initialized in the right order.
static LLCommandHandlerRegistry instance;
return instance;
}
void LLCommandHandlerRegistry::add(const char* cmd,
LLCommandHandler::EUntrustedAccess untrusted_access,
LLCommandHandler* handler)
{
LLCommandHandlerInfo info;
info.mUntrustedBrowserAccess = untrusted_access;
info.mHandler = handler;
mMap[cmd] = info;
}
bool LLCommandHandlerRegistry::dispatch(const std::string& cmd,
const LLSD& params,
const LLSD& query_map,
LLMediaCtrl* web,
bool trusted_browser)
{
static bool slurl_blocked = false;
static bool slurl_throttled = false;
static F64 last_throttle_time = 0.0;
F64 cur_time = 0.0;
std::map<std::string, LLCommandHandlerInfo>::iterator it = mMap.find(cmd);
if (it == mMap.end()) return false;
const LLCommandHandlerInfo& info = it->second;
if (!trusted_browser)
{
switch (info.mUntrustedBrowserAccess)
{
case LLCommandHandler::UNTRUSTED_ALLOW:
// fall through and let the command be handled
break;
case LLCommandHandler::UNTRUSTED_BLOCK:
// block request from external browser, but report as
// "handled" because it was well formatted.
LL_WARNS_ONCE("SLURL") << "Blocked SLURL command from untrusted browser" << LL_ENDL;
if (! slurl_blocked)
{
LLNotificationsUtil::add("BlockedSLURL");
slurl_blocked = true;
}
return true;
case LLCommandHandler::UNTRUSTED_THROTTLE:
cur_time = LLTimer::getElapsedSeconds();
if (cur_time < last_throttle_time + THROTTLE_PERIOD)
{
// block request from external browser if it happened
// within THROTTLE_PERIOD secs of the last command
LL_WARNS_ONCE("SLURL") << "Throttled SLURL command from untrusted browser" << LL_ENDL;
if (! slurl_throttled)
{
LLNotificationsUtil::add("ThrottledSLURL");
slurl_throttled = true;
}
return true;
}
last_throttle_time = cur_time;
break;
}
}
if (!info.mHandler) return false;
return info.mHandler->handle(params, query_map, web);
}
//---------------------------------------------------------------------------
// Automatic registration of commands, runs before main()
//---------------------------------------------------------------------------
LLCommandHandler::LLCommandHandler(const char* cmd,
EUntrustedAccess untrusted_access)
{
LLCommandHandlerRegistry::instance().add(cmd, untrusted_access, this);
}
LLCommandHandler::~LLCommandHandler()
{
// Don't care about unregistering these, all the handlers
// should be static objects.
}
//---------------------------------------------------------------------------
// Public interface
//---------------------------------------------------------------------------
// static
bool LLCommandDispatcher::dispatch(const std::string& cmd,
const LLSD& params,
const LLSD& query_map,
LLMediaCtrl* web,
bool trusted_browser)
{
return LLCommandHandlerRegistry::instance().dispatch(
cmd, params, query_map, web, trusted_browser);
}
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