/** 
 * @file llxmlrpctransaction.cpp
 * @brief LLXMLRPCTransaction and related class implementations 
 *
 * $LicenseInfo:firstyear=2006&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library 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;
 * version 2.1 of the License only.
 * 
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "llviewerprecompiledheaders.h"
// include this to get winsock2 because openssl attempts to include winsock1
#include "llwin32headerslean.h"
#include <openssl/x509_vfy.h>
#include <openssl/ssl.h>
#include "llsecapi.h"

#include "llxmlrpctransaction.h"
#include "llxmlrpclistener.h"

#include "httpcommon.h"
#include "llhttpconstants.h"
#include "httprequest.h"
#include "httpoptions.h"
#include "httpheaders.h"
#include "bufferarray.h"
#include "llversioninfo.h"
#include "llviewercontrol.h"
#include "stringize.h"

// Have to include these last to avoid queue redefinition!

#ifdef LL_USESYSTEMLIBS
#include <xmlrpc.h>
#else
#include <xmlrpc-epi/xmlrpc.h>
#endif

#include "llappviewer.h"
#include "lltrans.h"

#include "boost/move/unique_ptr.hpp"

namespace boost
{
	using ::boost::movelib::unique_ptr; // move unique_ptr into the boost namespace.
}

// Static instance of LLXMLRPCListener declared here so that every time we
// bring in this code, we instantiate a listener. If we put the static
// instance of LLXMLRPCListener into llxmlrpclistener.cpp, the linker would
// simply omit llxmlrpclistener.o, and shouting on the LLEventPump would do
// nothing.
static LLXMLRPCListener listener("LLXMLRPCTransaction");

LLXMLRPCValue LLXMLRPCValue::operator[](const char* id) const
{
	return LLXMLRPCValue(XMLRPC_VectorGetValueWithID(mV, id));
}

std::string LLXMLRPCValue::asString() const
{
	const char* s = XMLRPC_GetValueString(mV);
	return s ? s : "";
}

int		LLXMLRPCValue::asInt() const	{ return XMLRPC_GetValueInt(mV); }
bool	LLXMLRPCValue::asBool() const	{ return XMLRPC_GetValueBoolean(mV) != 0; }
double	LLXMLRPCValue::asDouble() const	{ return XMLRPC_GetValueDouble(mV); }

LLXMLRPCValue LLXMLRPCValue::rewind()
{
	return LLXMLRPCValue(XMLRPC_VectorRewind(mV));
}

LLXMLRPCValue LLXMLRPCValue::next()
{
	return LLXMLRPCValue(XMLRPC_VectorNext(mV));
}

bool LLXMLRPCValue::isValid() const
{
	return mV != NULL;
}

LLXMLRPCValue LLXMLRPCValue::createArray()
{
	return LLXMLRPCValue(XMLRPC_CreateVector(NULL, xmlrpc_vector_array));
}

LLXMLRPCValue LLXMLRPCValue::createStruct()
{
	return LLXMLRPCValue(XMLRPC_CreateVector(NULL, xmlrpc_vector_struct));
}


void LLXMLRPCValue::append(LLXMLRPCValue& v)
{
	XMLRPC_AddValueToVector(mV, v.mV);
}

void LLXMLRPCValue::appendString(const std::string& v)
{
	XMLRPC_AddValueToVector(mV, XMLRPC_CreateValueString(NULL, v.c_str(), 0));
}

void LLXMLRPCValue::appendInt(int v)
{
	XMLRPC_AddValueToVector(mV, XMLRPC_CreateValueInt(NULL, v));
}

void LLXMLRPCValue::appendBool(bool v)
{
	XMLRPC_AddValueToVector(mV, XMLRPC_CreateValueBoolean(NULL, v));
}

void LLXMLRPCValue::appendDouble(double v)
{
	XMLRPC_AddValueToVector(mV, XMLRPC_CreateValueDouble(NULL, v));
}


void LLXMLRPCValue::append(const char* id, LLXMLRPCValue& v)
{
	XMLRPC_SetValueID(v.mV, id, 0);
	XMLRPC_AddValueToVector(mV, v.mV);
}

void LLXMLRPCValue::appendString(const char* id, const std::string& v)
{
	XMLRPC_AddValueToVector(mV, XMLRPC_CreateValueString(id, v.c_str(), 0));
}

void LLXMLRPCValue::appendInt(const char* id, int v)
{
	XMLRPC_AddValueToVector(mV, XMLRPC_CreateValueInt(id, v));
}

void LLXMLRPCValue::appendBool(const char* id, bool v)
{
	XMLRPC_AddValueToVector(mV, XMLRPC_CreateValueBoolean(id, v));
}

void LLXMLRPCValue::appendDouble(const char* id, double v)
{
	XMLRPC_AddValueToVector(mV, XMLRPC_CreateValueDouble(id, v));
}

void LLXMLRPCValue::cleanup()
{
	XMLRPC_CleanupValue(mV);
	mV = NULL;
}

XMLRPC_VALUE LLXMLRPCValue::getValue() const
{
	return mV;
}


class LLXMLRPCTransaction::Handler : public LLCore::HttpHandler
{
public: 
	Handler(LLCore::HttpRequest::ptr_t &request, LLXMLRPCTransaction::Impl *impl);
	virtual ~Handler();

	virtual void onCompleted(LLCore::HttpHandle handle, LLCore::HttpResponse * response);

	typedef boost::shared_ptr<LLXMLRPCTransaction::Handler> ptr_t;

private:

	LLXMLRPCTransaction::Impl *mImpl;
	LLCore::HttpRequest::ptr_t mRequest;
};

class LLXMLRPCTransaction::Impl
{
public:
	typedef LLXMLRPCTransaction::EStatus	EStatus;

	LLCore::HttpRequest::ptr_t	mHttpRequest;


	EStatus				mStatus;
	CURLcode			mCurlCode;
	std::string			mStatusMessage;
	std::string			mStatusURI;
	LLCore::HttpResponse::TransferStats::ptr_t	mTransferStats;
	Handler::ptr_t		mHandler;
	LLCore::HttpHandle	mPostH;

	std::string			mURI;

	std::string			mProxyAddress;

	std::string			mResponseText;
	XMLRPC_REQUEST		mResponse;
	std::string         mCertStore;
	LLSD mErrorCertData;

	Impl(const std::string& uri, XMLRPC_REQUEST request, bool useGzip, const LLSD& httpParams);
	Impl(const std::string& uri,
		const std::string& method, LLXMLRPCValue params, bool useGzip);
	~Impl();

	bool process();

	void setStatus(EStatus code, const std::string& message = "", const std::string& uri = "");
	void setHttpStatus(const LLCore::HttpStatus &status);

private:
	void init(XMLRPC_REQUEST request, bool useGzip, const LLSD& httpParams);
};

LLXMLRPCTransaction::Handler::Handler(LLCore::HttpRequest::ptr_t &request, 
		LLXMLRPCTransaction::Impl *impl) :
	mImpl(impl),
	mRequest(request)
{
}

LLXMLRPCTransaction::Handler::~Handler()
{
}

void LLXMLRPCTransaction::Handler::onCompleted(LLCore::HttpHandle handle, 
	LLCore::HttpResponse * response)
{
	LLCore::HttpStatus status = response->getStatus();

	if (!status)
	{
        mImpl->setHttpStatus(status);
        LLSD errordata = status.getErrorData();
        mImpl->mErrorCertData = errordata;

		if ((status.toULong() != CURLE_SSL_PEER_CERTIFICATE) &&
			(status.toULong() != CURLE_SSL_CACERT))
		{
			// if we have a curl error that's not already been handled
			// (a non cert error), then generate the warning message as
			// appropriate
			LL_WARNS() << "LLXMLRPCTransaction error "
				<< status.toHex() << ": " << status.toString() << LL_ENDL;
			LL_WARNS() << "LLXMLRPCTransaction request URI: "
				<< mImpl->mURI << LL_ENDL;
		}

		return;
	}

	mImpl->setStatus(LLXMLRPCTransaction::StatusComplete);
	mImpl->mTransferStats = response->getTransferStats();

	// the contents of a buffer array are potentially noncontiguous, so we
	// will need to copy them into an contiguous block of memory for XMLRPC.
	LLCore::BufferArray *body = response->getBody();
	char * bodydata = new char[body->size()];

	body->read(0, bodydata, body->size());

	mImpl->mResponse = XMLRPC_REQUEST_FromXML(bodydata, body->size(), 0);

	delete[] bodydata;

	bool		hasError = false;
	bool		hasFault = false;
	int			faultCode = 0;
	std::string	faultString;

	LLXMLRPCValue error(XMLRPC_RequestGetError(mImpl->mResponse));
	if (error.isValid())
	{
		hasError = true;
		faultCode = error["faultCode"].asInt();
		faultString = error["faultString"].asString();
	}
	else if (XMLRPC_ResponseIsFault(mImpl->mResponse))
	{
		hasFault = true;
		faultCode = XMLRPC_GetResponseFaultCode(mImpl->mResponse);
		faultString = XMLRPC_GetResponseFaultString(mImpl->mResponse);
	}

	if (hasError || hasFault)
	{
		mImpl->setStatus(LLXMLRPCTransaction::StatusXMLRPCError);

		LL_WARNS() << "LLXMLRPCTransaction XMLRPC "
			<< (hasError ? "error " : "fault ")
			<< faultCode << ": "
			<< faultString << LL_ENDL;
		LL_WARNS() << "LLXMLRPCTransaction request URI: "
			<< mImpl->mURI << LL_ENDL;
	}

}

//=========================================================================

LLXMLRPCTransaction::Impl::Impl(const std::string& uri,
		XMLRPC_REQUEST request, bool useGzip, const LLSD& httpParams)
	: mHttpRequest(),
	  mStatus(LLXMLRPCTransaction::StatusNotStarted),
	  mURI(uri),
	  mResponse(0)
{
	init(request, useGzip, httpParams);
}


LLXMLRPCTransaction::Impl::Impl(const std::string& uri,
		const std::string& method, LLXMLRPCValue params, bool useGzip)
	: mHttpRequest(),
	  mStatus(LLXMLRPCTransaction::StatusNotStarted),
	  mURI(uri),
	  mResponse(0)
{
	XMLRPC_REQUEST request = XMLRPC_RequestNew();
	XMLRPC_RequestSetMethodName(request, method.c_str());
	XMLRPC_RequestSetRequestType(request, xmlrpc_request_call);
	XMLRPC_RequestSetData(request, params.getValue());
	
	init(request, useGzip, LLSD());
    // DEV-28398: without this XMLRPC_RequestFree() call, it looks as though
    // the 'request' object is simply leaked. It's less clear to me whether we
    // should also ask to free request value data (second param 1), since the
    // data come from 'params'.
    XMLRPC_RequestFree(request, 1);
}

void LLXMLRPCTransaction::Impl::init(XMLRPC_REQUEST request, bool useGzip, const LLSD& httpParams)
{
	LLCore::HttpOptions::ptr_t httpOpts;
	LLCore::HttpHeaders::ptr_t httpHeaders;


	if (!mHttpRequest)
	{
		mHttpRequest = LLCore::HttpRequest::ptr_t(new LLCore::HttpRequest);
	}

	// LLRefCounted starts with a 1 ref, so don't add a ref in the smart pointer
	httpOpts = LLCore::HttpOptions::ptr_t(new LLCore::HttpOptions()); 

	// delay between repeats will start from 5 sec and grow to 20 sec with each repeat
	httpOpts->setMinBackoff(5E6L);
	httpOpts->setMaxBackoff(20E6L);

	httpOpts->setTimeout(httpParams.has("timeout") ? httpParams["timeout"].asInteger() : 40L);
	if (httpParams.has("retries"))
	{
		httpOpts->setRetries(httpParams["retries"].asInteger());
	}
	if (httpParams.has("DNSCacheTimeout"))
	{
		httpOpts->setDNSCacheTimeout(httpParams["DNSCacheTimeout"].asInteger());
	}

	bool vefifySSLCert = !gSavedSettings.getBOOL("NoVerifySSLCert");
	mCertStore = gSavedSettings.getString("CertStore");

	httpOpts->setSSLVerifyPeer( vefifySSLCert );
	httpOpts->setSSLVerifyHost( vefifySSLCert ? 2 : 0);

	// LLRefCounted starts with a 1 ref, so don't add a ref in the smart pointer
	httpHeaders = LLCore::HttpHeaders::ptr_t(new LLCore::HttpHeaders());

	httpHeaders->append(HTTP_OUT_HEADER_CONTENT_TYPE, HTTP_CONTENT_TEXT_XML);

	std::string user_agent = stringize(
		LLVersionInfo::instance().getChannel(), ' ',
		LLVersionInfo::instance().getMajor(), '.',
		LLVersionInfo::instance().getMinor(), '.',
		LLVersionInfo::instance().getPatch(), " (",
		LLVersionInfo::instance().getBuild(), ')');

	httpHeaders->append(HTTP_OUT_HEADER_USER_AGENT, user_agent);

	///* Setting the DNS cache timeout to -1 disables it completely.
	//This might help with bug #503 */
	//httpOpts->setDNSCacheTimeout(-1);

	LLCore::BufferArray::ptr_t body = LLCore::BufferArray::ptr_t(new LLCore::BufferArray());

	// TODO: See if there is a way to serialize to a preallocated buffer I'm 
	// not fond of the copy here.
	int	requestSize(0);
	char * requestText = XMLRPC_REQUEST_ToXML(request, &requestSize);

	body->append(requestText, requestSize);
	
	XMLRPC_Free(requestText);

	mHandler = LLXMLRPCTransaction::Handler::ptr_t(new Handler( mHttpRequest, this ));

	mPostH = mHttpRequest->requestPost(LLCore::HttpRequest::DEFAULT_POLICY_ID, 0, 
		mURI, body.get(), httpOpts, httpHeaders, mHandler);

}


LLXMLRPCTransaction::Impl::~Impl()
{
	if (mResponse)
	{
		XMLRPC_RequestFree(mResponse, 1);
	}
}

bool LLXMLRPCTransaction::Impl::process()
{
	if (!mPostH || !mHttpRequest)
	{
		LL_WARNS() << "transaction failed." << LL_ENDL;
		return true; //failed, quit.
	}

	switch (mStatus)
	{
		case LLXMLRPCTransaction::StatusComplete:
		case LLXMLRPCTransaction::StatusCURLError:
		case LLXMLRPCTransaction::StatusXMLRPCError:
		case LLXMLRPCTransaction::StatusOtherError:
		{
			return true;
		}

		case LLXMLRPCTransaction::StatusNotStarted:
		{
			setStatus(LLXMLRPCTransaction::StatusStarted);
			break;
		}

		default:
			break;
	}

	LLCore::HttpStatus status = mHttpRequest->update(0);

	status = mHttpRequest->getStatus();
	if (!status) 
	{
		return false;
	}

	return false;
}

void LLXMLRPCTransaction::Impl::setStatus(EStatus status,
	const std::string& message, const std::string& uri)
{
	mStatus = status;
	mStatusMessage = message;
	mStatusURI = uri;

	if (mStatusMessage.empty())
	{
		switch (mStatus)
		{
			case StatusNotStarted:
				mStatusMessage = "(not started)";
				break;
				
			case StatusStarted:
				mStatusMessage = "(waiting for server response)";
				break;
				
			case StatusDownloading:
				mStatusMessage = "(reading server response)";
				break;
				
			case StatusComplete:
				mStatusMessage = "(done)";
				break;
			default:
				// Usually this means that there's a problem with the login server,
				// not with the client.  Direct user to status page.
				mStatusMessage = LLTrans::getString("server_is_down");
				mStatusURI = "http://status.secondlifegrid.net/";
		}
	}
}

void LLXMLRPCTransaction::Impl::setHttpStatus(const LLCore::HttpStatus &status)
{
	CURLcode code = static_cast<CURLcode>(status.toULong());
	std::string message;
	std::string uri = "http://support.secondlife.com";
	LLURI failuri(mURI);
	LLStringUtil::format_map_t args;

	switch (code)
	{
	case CURLE_COULDNT_RESOLVE_HOST:
		args["[HOSTNAME]"] = failuri.hostName();
		message = LLTrans::getString("couldnt_resolve_host", args);
		break;

#if CURLE_SSL_PEER_CERTIFICATE != CURLE_SSL_CACERT
	case CURLE_SSL_PEER_CERTIFICATE:
		message = LLTrans::getString("ssl_peer_certificate");
		break;
#endif
	case CURLE_SSL_CACERT:
	case CURLE_SSL_CONNECT_ERROR:		
		message = LLTrans::getString("ssl_connect_error");
		break;

	default:
		break;
	}

	mCurlCode = code;
	setStatus(StatusCURLError, message, uri);

}


LLXMLRPCTransaction::LLXMLRPCTransaction(
	const std::string& uri, XMLRPC_REQUEST request, bool useGzip, const LLSD& httpParams)
: impl(* new Impl(uri, request, useGzip, httpParams))
{ }


LLXMLRPCTransaction::LLXMLRPCTransaction(
	const std::string& uri,
	const std::string& method, LLXMLRPCValue params, bool useGzip)
: impl(* new Impl(uri, method, params, useGzip))
{ }

LLXMLRPCTransaction::~LLXMLRPCTransaction()
{
	delete &impl;
}

bool LLXMLRPCTransaction::process()
{
	return impl.process();
}

LLXMLRPCTransaction::EStatus LLXMLRPCTransaction::status(int* curlCode)
{
	if (curlCode)
	{
		*curlCode = 
			(impl.mStatus == StatusCURLError)
				? impl.mCurlCode
				: CURLE_OK;
	}
		
	return impl.mStatus;
}

std::string LLXMLRPCTransaction::statusMessage()
{
	return impl.mStatusMessage;
}

LLSD LLXMLRPCTransaction::getErrorCertData()
{
	return impl.mErrorCertData;
}

std::string LLXMLRPCTransaction::statusURI()
{
	return impl.mStatusURI;
}

XMLRPC_REQUEST LLXMLRPCTransaction::response()
{
	return impl.mResponse;
}

LLXMLRPCValue LLXMLRPCTransaction::responseValue()
{
	return LLXMLRPCValue(XMLRPC_RequestGetData(impl.mResponse));
}


F64 LLXMLRPCTransaction::transferRate()
{
	if (impl.mStatus != StatusComplete)
	{
		return 0.0L;
	}
	
	double rate_bits_per_sec = impl.mTransferStats->mSpeedDownload * 8.0;
	
	LL_INFOS("AppInit") << "Buffer size:   " << impl.mResponseText.size() << " B" << LL_ENDL;
	LL_DEBUGS("AppInit") << "Transfer size: " << impl.mTransferStats->mSizeDownload << " B" << LL_ENDL;
	LL_DEBUGS("AppInit") << "Transfer time: " << impl.mTransferStats->mTotalTime << " s" << LL_ENDL;
	LL_INFOS("AppInit") << "Transfer rate: " << rate_bits_per_sec / 1000.0 << " Kb/s" << LL_ENDL;

	return rate_bits_per_sec;
}