//=============================================================================
//
//   File : KvsObject_http.cpp
//   Creation date : Fry Sep 5 18:13:45 2008 GMT by Carbone Alesssandro
//
//   This file is part of the KVIrc irc client distribution
//   Copyright (C) 2009 Alessandro Carbone (elfonol at gmail dot com)
//
//   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 opinion) 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
//=============================================================================

#include "KvsObject_http.h"

#include "kvi_debug.h"
#include "KviError.h"
#include "KviLocale.h"

#include <QHttp>
#include <QUrl>
#include <QUrlInfo>

#ifndef QT_NO_OPENSSL
	#include <QSslError>

	const char * const ssl_errors_tbl[] = {
		"NoError",
		"UnableToGetIssuerCertificate",
		"UnableToDecryptCertificateSignature",
		"UnableToDecodeIssuerPublicKey",
		"CertificateSignatureFailed",
		"CertificateNotYetValid",
		"CertificateExpired",
		"InvalidNotBeforeField",
		"InvalidNotAfterField",
		"SelfSignedCertificate",
		"SelfSignedCertificateInChain",
		"UnableToGetLocalIssuerCertificate",
		"UnableToVerifyFirstCertificate",
		"CertificateRevoked",
		"InvalidCaCertificate",
		"PathLengthExceeded",
		"InvalidPurpose",
		"CertificateUntrusted",
		"CertificateRejected",
		"SubjectIssuerMismatch",
		"AuthorityIssuerSerialNumberMismatch",
		"NoPeerCertificate",
		"HostNameMismatch",
		"UnspecifiedError",
		"NoSslSupport"
	};
#endif

/*
	@doc: http
	@keyterms:
		http object class
	@title:
		http class
	@type:
		class
	@short:
		An implementation of the client side of HTTP protocol.
	@inherits:
		[class]object[/class]
	@description:
		This class provides a standard HTTP functionality.[br]
	@functions:
		!fn: <id:integer>$get(<remote_path:string>,[<local_file: string>])
		Sends a get request for path to the server set by [classfnc]$setHost[/classfnc].
		If local_file is not specified readyRead() signal is emitted every time new content data is available to read.
		!fn: <id:integer>$post(<remote_path:string>,<post_data:string>,<local_file: string>
		Sends a post request for path to the server set by [classfnc]$setHost[/classfnc].
		If local_file is not specified readyRead() signal is emitted every time new content data is available to read.
		!fn: $abort()
		Aborts the current request and deletes all scheduled requests.
		!fn: <id:integer>$setHost(<host:string>,<remote_port:unsigned_integer>)
		Sets the HTTP server that is used for requests to hostName on port port.
		The function does not block: the request is scheduled, and its execution is performed asynchronously.
		The function returns a unique identifier which is passed by [classfnc]requestStartedEvent()[/classfnc] and [classfnc]requestFinishedEvent()[/classfnc].
		When the request is started the requestStarted() signal is emitted. When it is finished the requestFinished() signal is emitted.
		!fn: <id:integer>$currentId()
		Returns the identifier of the HTTP request being executed or 0 if there is no request being executed.
		!fn: <id:integer> $setProxy(<host:string>,<port:integer>,[<user:string>,<password:string>])
		Enables HTTP proxy support, using the proxy server host on port port.
		Optionals parameters user and password can be provided if the proxy server requires authentication.
		!fn: <id:integer> $setUser(<user:string>,<password:string>)
		This function sets the user name userName and password password for web pages that require authentication.
		!fn: <string> $readAll()
		Reads all the bytes from the response content and returns them as string.
		!fn: <error:string> $errorString()
		Returns a human-readable description of the last error that occurred.
		!fn: $ignoreSslErrors()
		!fn: $requestFinishedEvent(<id:integer>,<error:boolean>)
		This event is triggered by KVIrc when the request identified by <id> has finished.
		!fn: $requestStartedEvent(<id:integer>,<error:boolean>)
		This event is triggered by KVIrc when the request identified by <id> has started.
		!fn: $responseHeaderReceivedEvent(<response:string>)
		This event is triggered by KVIrc when he HTTP header of a server response is available.
		The response is passed ad string.
		!fn: $doneEvent(<error:boolean>)
		This event is triggered when the last pending request has finished; (it is emitted after the last request's requestFinished() signal).
		!fn: $dataReadProgressEvent(<done:integer>,<total:integer>)
		This event is triggered when reads data from a HTTP server.
		<done> is the amount of data has already arrived and <total> is the total amount of data.
		!fn: $dataSendProgressEvent(<done:integer>,<total:integer>)
		This event is triggered when sends data to a HTTP server.
		<done> is the amount of data has already arrived and <total> is the total amount of data.
		!fn: $stateChangedEvent(<connection_state:string>)
		This event is triggered by the framework when the state of the connection changes.
		!fn: $readyReadEvent(<response:string>)
		This event is triggered by the framework when there is new data read and there is not file specified in [classfnc]get[/classfunc] or [classfnc]post[/classfunc].
		You can call [classfnc]readAll[/classfnc] to reads all the bytes from the response data.
		!fn: $sslErrorsEvent(<sslerrors:string>)
		Returns the list of errors that occurred during the SSL handshake.
		Unless you call ignoreSslErrors() from within a slot connected to the signal emited by this event,
		the framwork will tear down the connection immediately after emitting the signal.
	@signals:
		!sg: $requestStarted()
		This signal is emitted by the default implementation of [classfnc]$requestStartedEvent[/classfnc].
		!sg: $requestFinished()
		This signal is emitted by the default implementation of [classfnc]$requestFinishedEvent[/classfnc].
		!sg: $dataSendProgress()
		This signal is emitted by the default implementation of [classfnc]$dataSendProgressEvent[/classfnc].
		!sg: $dataReadProgress()
		This signal is emitted by the default implementation of [classfnc]$dataReadProgressEvent[/classfnc].
		!sg: $done()
		This signal is emitted by the default implementation of [classfnc]$doneEvent[/classfnc].
		!sg: $readyRead()
		This signal is emitted by the default implementation of [classfnc]$readyReadEvent[/classfnc].
		!sg: $sslErrors()
		This signal is emitted by the default implementation of [classfnc]$sslErrorsEvent[/classfnc].
		!sg: $stateChanged()
		This signal is emitted by the default implementation of [classfnc]$stateChangedEvent[/classfnc].
		!sg: $responseHeaderReceived()
		This signal is emitted by the default implementation of [classfnc]$responseHeaderReceivedEvent[/classfnc].
*/

KVSO_BEGIN_REGISTERCLASS(KvsObject_http,"http","object")
	KVSO_REGISTER_HANDLER(KvsObject_http,"get",functionGet)
	KVSO_REGISTER_HANDLER(KvsObject_http,"post",functionPost)
	KVSO_REGISTER_HANDLER(KvsObject_http,"abort",functionAbort)
	KVSO_REGISTER_HANDLER(KvsObject_http,"setHost",functionSetHost)
	KVSO_REGISTER_HANDLER(KvsObject_http,"setProxy",functionSetProxy)
	KVSO_REGISTER_HANDLER(KvsObject_http,"currentId",functionCurrentId)
	KVSO_REGISTER_HANDLER(KvsObject_http,"setUser",functionSetUser)
	KVSO_REGISTER_HANDLER(KvsObject_http,"readAll",functionReadAll)
	KVSO_REGISTER_HANDLER(KvsObject_http,"errorString",functionErrorString)
	KVSO_REGISTER_HANDLER(KvsObject_http,"setFollowRedirect",functionFollowRedirect)

	// events
	KVSO_REGISTER_HANDLER(KvsObject_http,"doneEvent",functionDoneEvent)
	KVSO_REGISTER_HANDLER(KvsObject_http,"requestFinishedEvent",functionRequestFinishedEvent)
	KVSO_REGISTER_HANDLER(KvsObject_http,"requestStartedEvent",functionRequestStartedEvent)
	KVSO_REGISTER_HANDLER(KvsObject_http,"responseHeaderReceivedEvent",functionResponseHeaderReceivedEvent)
	KVSO_REGISTER_HANDLER(KvsObject_http,"dataReadProgressEvent",functionDataReadProgressEvent)
	KVSO_REGISTER_HANDLER(KvsObject_http,"dataSendProgressEvent",functionDataSendProgressEvent)
	KVSO_REGISTER_HANDLER(KvsObject_http,"stateChangedEvent",functionStateChangedEvent)
	KVSO_REGISTER_HANDLER(KvsObject_http,"readyReadEvent",functionReadyReadEvent)
	#ifndef QT_NO_OPENSSL
	KVSO_REGISTER_HANDLER(KvsObject_http,"sslErrorsEvent",functionSslErrorsEvent)
	KVSO_REGISTER_HANDLER(KvsObject_http,"ignoreSSlErrors",functionIgnoreSslErrors)
	#endif
KVSO_END_REGISTERCLASS(KvsObject_http)


KVSO_BEGIN_CONSTRUCTOR(KvsObject_http,KviKvsObject)
	m_pHttp = new QHttp();
	m_bAbort=false;
	m_bEnableForceRedirect=false;
	connect(m_pHttp,SIGNAL(requestFinished(int,bool)),this,SLOT(slotRequestFinished(int,bool)));
	connect(m_pHttp,SIGNAL(done(bool)),this,SLOT(slotDone(bool)));

	connect(m_pHttp,SIGNAL(requestStarted(int)),this,SLOT(slotRequestStarted(int)));
	connect(m_pHttp,SIGNAL(dataSendProgress(int,int)),this,SLOT(slotDataSendProgress(int,int)));
	connect(m_pHttp,SIGNAL(dataReadProgress(int,int)),this,SLOT(slotDataReadProgress(int,int)));
	connect(m_pHttp,SIGNAL(responseHeaderReceived ( const QHttpResponseHeader & )),this,SLOT(slotResponseHeaderReceived(const QHttpResponseHeader &)));
	connect(m_pHttp,SIGNAL(readyRead ( const QHttpResponseHeader & )),this,SLOT(slotReadyRead(const QHttpResponseHeader &)));
	#ifndef QT_NO_OPENSSL
	connect(m_pHttp,SIGNAL(sslErrors ( const QList<QSslError> & )),this,SLOT(slotSslErrors(const QList<QSslError> & )));
	#endif
	connect(m_pHttp,SIGNAL(stateChanged(int)),this,SLOT(slotStateChanged(int)));

KVSO_END_CONSTRUCTOR(KvsObject_http)

KVSO_BEGIN_DESTRUCTOR(KvsObject_http)
	QHashIterator<int,QFile *> t(getDict);
	while (t.hasNext())
	{
		t.next();
		int key=t.key();
		QFile *pFile=getDict.value(key);
		pFile->close();
		delete pFile;
	}
	getDict.clear();
	delete m_pHttp;

KVSO_END_DESTRUCTOR(KvsObject_http)
//----------------------


bool  KvsObject_http::functionSetHost(KviKvsObjectFunctionCall *c)
{
	CHECK_INTERNAL_POINTER(m_pHttp)
	QString szHost;
	QString szConnectionType;
	kvs_uint_t uRemotePort;
	KVSO_PARAMETERS_BEGIN(c)
		KVSO_PARAMETER("host",KVS_PT_STRING,0,szHost)
		KVSO_PARAMETER("remote_port",KVS_PT_UNSIGNEDINTEGER,KVS_PF_OPTIONAL,uRemotePort)
	KVSO_PARAMETERS_END(c)
	QUrl url(szHost);
	if (!url.isValid())
	{
		c->warning(__tr2qs_ctx("Host '%Q' is not a valid url","objects"),&szHost);
		return true;
	}
	if (!szHost.isEmpty() && url.host().isEmpty()) url.setHost(szHost);
	if (!uRemotePort) uRemotePort=80;
	kvs_uint_t id=0;
	QHttp::ConnectionMode mode;
	if(url.scheme().toLower()=="https")  mode=QHttp::ConnectionModeHttps;
	else {mode=QHttp::ConnectionModeHttp;url.setScheme("http");}
	if (mode==QHttp::ConnectionModeHttps) uRemotePort=443;
	id=m_pHttp->setHost(url.host(), mode, uRemotePort);
	c->returnValue()->setInteger(id);
	return true;
}
bool  KvsObject_http::functionCurrentId(KviKvsObjectFunctionCall *c)
{
	CHECK_INTERNAL_POINTER(m_pHttp)
	c->returnValue()->setInteger(m_pHttp->currentId());
	return true;
}
bool  KvsObject_http::functionSetUser(KviKvsObjectFunctionCall *c)
{
	CHECK_INTERNAL_POINTER(m_pHttp)
	QString szUser;
	QString szPass;
	KVSO_PARAMETERS_BEGIN(c)
		KVSO_PARAMETER("user",KVS_PT_STRING,0,szUser)
		KVSO_PARAMETER("password",KVS_PT_STRING,0,szPass)
	KVSO_PARAMETERS_END(c)
	m_pHttp->setUser(szUser,szPass);
	return true;
}
bool  KvsObject_http::functionSetProxy(KviKvsObjectFunctionCall *c)
{
	CHECK_INTERNAL_POINTER(m_pHttp)
	QString szHost;
	QString szUser,szPass;
	kvs_uint_t uRemotePort;
	KVSO_PARAMETERS_BEGIN(c)
		KVSO_PARAMETER("host",KVS_PT_STRING,0,szHost)
		KVSO_PARAMETER("remote_port",KVS_PT_UNSIGNEDINTEGER,KVS_PF_OPTIONAL,uRemotePort)
		KVSO_PARAMETER("user",KVS_PT_STRING,KVS_PF_OPTIONAL,szUser)
		KVSO_PARAMETER("pass",KVS_PT_STRING,KVS_PF_OPTIONAL,szPass)
	KVSO_PARAMETERS_END(c)
	m_pHttp->setProxy(szHost,uRemotePort,szUser,szPass);
	return true;
}

bool  KvsObject_http::functionGet(KviKvsObjectFunctionCall *c)
{
	CHECK_INTERNAL_POINTER(m_pHttp)
	QString szPath,szDest;
	KVSO_PARAMETERS_BEGIN(c)
		KVSO_PARAMETER("remote_path",KVS_PT_STRING,0,szPath)
		KVSO_PARAMETER("local_filename",KVS_PT_STRING,KVS_PF_OPTIONAL,szDest)
	KVSO_PARAMETERS_END(c)
	
	QFile * pFile=0;
	if (!szDest.isEmpty())
	{
		pFile=new QFile(szDest);
		if (pFile)
		{
			pFile->open(QIODevice::WriteOnly);
		} else {
			c->warning(__tr2qs_ctx("'%Q' is not a valid file path","objects"),&szDest);
			c->returnValue()->setInteger(-1);
			return true;
		}
	}

	if (szPath.isEmpty()) szPath="/";
	int id=m_pHttp->get(szPath,pFile);
	if (pFile) getDict[id]=pFile;
	c->returnValue()->setInteger(id);
	return true;
}
bool  KvsObject_http::functionPost(KviKvsObjectFunctionCall *c)
{
	CHECK_INTERNAL_POINTER(m_pHttp)
	QString szPath,szDest,szData;
	KVSO_PARAMETERS_BEGIN(c)
		KVSO_PARAMETER("remote_path",KVS_PT_STRING,0,szPath)
		KVSO_PARAMETER("post_data",KVS_PT_STRING,0,szData)
		KVSO_PARAMETER("local_filename",KVS_PT_STRING,0,szDest)
	KVSO_PARAMETERS_END(c)
	QFile *pFile=0;
	if (!szDest.isEmpty()){
		pFile=new QFile(szDest);
		if (pFile)
		{
			pFile->open(QIODevice::WriteOnly);
		}
	}
	if (szPath.isEmpty()) szPath="/";
	int id=m_pHttp->post(szPath,szDest.toAscii(),pFile);
	if (pFile) getDict[id]=pFile;
	c->returnValue()->setInteger(id);
	return true;
}
bool  KvsObject_http::functionAbort(KviKvsObjectFunctionCall *c)
{
	CHECK_INTERNAL_POINTER(m_pHttp)
	m_bAbort=true;
	m_pHttp->abort();
	return true;
}
bool  KvsObject_http::functionReadAll(KviKvsObjectFunctionCall *c)
{
	CHECK_INTERNAL_POINTER(m_pHttp)
	c->returnValue()->setString(m_pHttp->readAll());
	return true;
}
bool  KvsObject_http::functionErrorString(KviKvsObjectFunctionCall *c)
{
	CHECK_INTERNAL_POINTER(m_pHttp)
	c->returnValue()->setString(m_pHttp->errorString());
	return true;
}
bool KvsObject_http::functionFollowRedirect(KviKvsObjectFunctionCall *c)
{
	bool bEnabled;
	KVSO_PARAMETERS_BEGIN(c)
		KVSO_PARAMETER("enable",KVS_PT_BOOLEAN,0,bEnabled)
	KVSO_PARAMETERS_END(c)
	m_bEnableForceRedirect=bEnabled;
	return true;
}
//signals & slots

bool KvsObject_http::functionRequestFinishedEvent(KviKvsObjectFunctionCall *c)
{
	emitSignal("requestFinished",c,c->params());
	return true;
}

void KvsObject_http::slotRequestFinished ( int id, bool error )
{

	if (m_bAbort)
	{
		m_bAbort=false;
		QHashIterator<int,QFile *> t(getDict);
		while (t.hasNext())
		{
			t.next();
			int key=t.key();
			QFile *pFile=getDict.value(key);
			pFile->close();
			delete pFile;
		}
		getDict.clear();
		return;
	}
	QFile *pFile=getDict.value(id);
	if (pFile)
	{
		QString name=pFile->fileName();
		pFile->close();
		getDict.remove(id);
		int res=m_pHttp->lastResponse().statusCode();
		if ((res==301 || res==302 || res==307) && m_bEnableForceRedirect)
			redirect(name,m_pHttp->lastResponse());
		delete pFile;
	}
	KviKvsVariantList lParams;
	lParams.append(new KviKvsVariant((kvs_int_t) id));
	lParams.append(new KviKvsVariant(error));
	callFunction(this,"requestFinishedEvent",0,&lParams);
}

bool KvsObject_http::functionRequestStartedEvent(KviKvsObjectFunctionCall *c)
{
	emitSignal("requestStarted",c,c->params());
	return true;
}
void KvsObject_http::slotRequestStarted ( int id )
{
	KviKvsVariantList lParams;
	lParams.append(new KviKvsVariant((kvs_int_t) id));
	callFunction(this,"requestStartedEvent",0,&lParams);
}

void KvsObject_http::slotDataReadProgress ( int done,int total )
{
	KviKvsVariantList lParams;
	lParams.append(new KviKvsVariant((kvs_int_t) done));
	lParams.append(new KviKvsVariant((kvs_int_t) total));
	callFunction(this,"dataReadProgressEvent",0,&lParams);
}
bool KvsObject_http::functionDataReadProgressEvent(KviKvsObjectFunctionCall *c)
{
	emitSignal("dataReadProgress",c,c->params());
	return true;
}
void KvsObject_http::slotDataSendProgress ( int done,int total )
{
	KviKvsVariantList lParams;
	lParams.append(new KviKvsVariant((kvs_int_t) done));
	lParams.append(new KviKvsVariant((kvs_int_t) total));
	callFunction(this,"dataSendProgressEvent",0,&lParams);
}
bool KvsObject_http::functionDataSendProgressEvent(KviKvsObjectFunctionCall *c)
{
	emitSignal("dataSendProgress",c,c->params());
	return true;
}
bool KvsObject_http::functionDoneEvent(KviKvsObjectFunctionCall *c)
{
	emitSignal("done",c,c->params());
	return true;
}
void KvsObject_http::slotDone ( bool error )
{
	KviKvsVariantList lParams;
	lParams.append(new KviKvsVariant(error));
	callFunction(this,"doneEvent",0,&lParams);
}

bool KvsObject_http::functionResponseHeaderReceivedEvent(KviKvsObjectFunctionCall *c)
{
	emitSignal("responseHeaderReceived",c,c->params());
	return true;
}
bool KvsObject_http::functionReadyReadEvent(KviKvsObjectFunctionCall *c)
{
	emitSignal("readyRead",c,c->params());
	return true;
}
void KvsObject_http::redirect(QString &file,const QHttpResponseHeader &r)
{
	QUrl url(r.value("location"));
	m_pHttp->setHost(url.host());
	QFile *pFile=0;
	pFile=new QFile(file);
	pFile->open(QIODevice::WriteOnly);
	int id=m_pHttp->get(url.path(),pFile);
	getDict[id]=pFile;
}

void KvsObject_http::slotResponseHeaderReceived(const QHttpResponseHeader &r)
{
	QString szResponse;
	switch (r.statusCode()) {
		case 200:	szResponse="Ok"  ;break;
		case 301:	szResponse="Moved Permanently" ;break;
		case 302:	szResponse="Found" ;break;
		case 303:	szResponse="See Other" ;break;
		case 307:	szResponse="Temporary Redirect" ;break;
		default: szResponse=r.reasonPhrase();
			m_bAbort=true;
	}
	if (r.statusCode()==400)
	{
		m_bAbort=true;
		m_pHttp->abort();
	}
	KviKvsVariantList lParams;
	lParams.append(new KviKvsVariant(szResponse));
	callFunction(this,"responseHeaderReceivedEvent",0,&lParams);

}
void KvsObject_http::slotReadyRead(const QHttpResponseHeader &r)
{
	QString szResponse;
	switch (r.statusCode()) {
		case 200:	szResponse="Ok"  ;break;
		case 301:	szResponse="Moved Permanently" ;break;
		case 302:	szResponse="Found" ;break;
		case 303:	szResponse="See Other" ;break;
		case 307:	szResponse="Temporary Redirect" ;break;
		default: szResponse=r.reasonPhrase();
			m_bAbort=true;
	}
	KviKvsVariantList lParams;
	lParams.append(new KviKvsVariant(szResponse));
	callFunction(this,"readyreadEvent",0,&lParams);
}




void KvsObject_http::slotStateChanged ( int state)
{
	QString szState="";
	if (state==QHttp::Unconnected) szState="Unconnected";
	else if (state==QHttp::HostLookup) szState="HostLookup";
	else if (state==QHttp::Connecting) szState="Connecting";
	else if (state==QHttp::Connected) szState="Connected";
	else if (state==QHttp::Sending) szState="Sending";
	else if (state==QHttp::Reading) szState="Reading";

	else if (state==QHttp::Closing) szState="Closing";
	KviKvsVariantList lParams;
	lParams.append(new KviKvsVariant(szState));
	callFunction(this,"stateChangedEvent",0,&lParams);
}
bool KvsObject_http::functionStateChangedEvent(KviKvsObjectFunctionCall *c)
{
	emitSignal("stateChanged",c,c->params());
	return true;
}

#ifndef QT_NO_OPENSSL

bool  KvsObject_http::functionIgnoreSslErrors(KviKvsObjectFunctionCall *)
{
	if (m_pHttp) m_pHttp->ignoreSslErrors();
	return true;
}
void KvsObject_http::slotSslErrors(QList<QSslError> sslerrors)
{
	KviKvsArray *pArray=0;
	pArray=new KviKvsArray();
	for(int i=0;i<sslerrors.count();i++)
	{
		pArray->set(i,new KviKvsVariant(ssl_errors_tbl[sslerrors.at(i).error()]));
	}
	KviKvsVariantList lParams;
	lParams.append(new KviKvsVariant(pArray));
	callFunction(this,"sslErrorEvent",0,&lParams);
	}

bool KvsObject_http::functionSslErrorsEvent(KviKvsObjectFunctionCall *c)
{

	emitSignal("sslErrors",c,c->params());
	return true;
}
#endif
#ifndef COMPILE_USE_STANDALONE_MOC_SOURCES
#include "m_KvsObject_http.moc"
#endif //!COMPILE_USE_STANDALONE_MOC_SOURCES
