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qgswfsrequest.cpp
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qgswfsrequest.cpp
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/***************************************************************************
qgswfsrequest.cpp
---------------------
begin : February 2016
copyright : (C) 2011 by Martin Dobias
(C) 2016 by Even Rouault
email : wonder dot sk at gmail dot com
even.rouault at spatialys.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 option) any later version. *
* *
***************************************************************************/
#include "qgswfsrequest.h"
#include "qgslogger.h"
#include "qgsmessagelog.h"
#include "qgsnetworkaccessmanager.h"
#include "qgsapplication.h"
#include <QEventLoop>
#include <QNetworkCacheMetaData>
#include <QCryptographicHash> // just for testin file:// fake_qgis_http_endpoint hack
#include <QFuture>
#include <QtConcurrent>
const qint64 READ_BUFFER_SIZE_HINT = 1024 * 1024;
QgsWfsRequest::QgsWfsRequest( const QgsWFSDataSourceURI &uri )
: mUri( uri )
, mErrorCode( QgsWfsRequest::NoError )
, mIsAborted( false )
, mForceRefresh( false )
, mTimedout( false )
, mGotNonEmptyResponse( false )
{
QgsDebugMsg( "theUri = " + uri.uri( ) );
connect( QgsNetworkAccessManager::instance(), &QgsNetworkAccessManager::requestTimedOut, this, &QgsWfsRequest::requestTimedOut );
}
QgsWfsRequest::~QgsWfsRequest()
{
abort();
}
void QgsWfsRequest::requestTimedOut( QNetworkReply *reply )
{
if ( reply == mReply )
mTimedout = true;
}
QUrl QgsWfsRequest::requestUrl( const QString &request ) const
{
return mUri.requestUrl( request );
}
bool QgsWfsRequest::sendGET( const QUrl &url, bool synchronous, bool forceRefresh, bool cache )
{
abort(); // cancel previous
mIsAborted = false;
mTimedout = false;
mGotNonEmptyResponse = false;
mErrorMessage.clear();
mErrorCode = QgsWfsRequest::NoError;
mForceRefresh = forceRefresh;
mResponse.clear();
QUrl modifiedUrl( url );
// Specific code for testing
if ( modifiedUrl.toString().contains( QLatin1String( "fake_qgis_http_endpoint" ) ) )
{
// Just for testing with local files instead of http:// resources
QString modifiedUrlString = modifiedUrl.toString();
// Qt5 does URL encoding from some reason (of the FILTER parameter for example)
modifiedUrlString = QUrl::fromPercentEncoding( modifiedUrlString.toUtf8() );
QgsDebugMsg( QStringLiteral( "Get %1" ).arg( modifiedUrlString ) );
modifiedUrlString = modifiedUrlString.mid( QStringLiteral( "http://" ).size() );
QString args = modifiedUrlString.mid( modifiedUrlString.indexOf( '?' ) );
if ( modifiedUrlString.size() > 256 )
{
args = QCryptographicHash::hash( args.toUtf8(), QCryptographicHash::Md5 ).toHex();
}
else
{
args.replace( QLatin1String( "?" ), QLatin1String( "_" ) );
args.replace( QLatin1String( "&" ), QLatin1String( "_" ) );
args.replace( QLatin1String( "<" ), QLatin1String( "_" ) );
args.replace( QLatin1String( ">" ), QLatin1String( "_" ) );
args.replace( QLatin1String( "'" ), QLatin1String( "_" ) );
args.replace( QLatin1String( "\"" ), QLatin1String( "_" ) );
args.replace( QLatin1String( " " ), QLatin1String( "_" ) );
args.replace( QLatin1String( ":" ), QLatin1String( "_" ) );
args.replace( QLatin1String( "/" ), QLatin1String( "_" ) );
args.replace( QLatin1String( "\n" ), QLatin1String( "_" ) );
}
#ifdef Q_OS_WIN
// Passing "urls" like "http://c:/path" to QUrl 'eats' the : after c,
// so we must restore it
if ( modifiedUrlString[1] == '/' )
{
modifiedUrlString = modifiedUrlString[0] + ":/" + modifiedUrlString.mid( 2 );
}
#endif
modifiedUrlString = modifiedUrlString.mid( 0, modifiedUrlString.indexOf( '?' ) ) + args;
QgsDebugMsg( QStringLiteral( "Get %1 (after laundering)" ).arg( modifiedUrlString ) );
modifiedUrl = QUrl::fromLocalFile( modifiedUrlString );
}
QgsDebugMsgLevel( QStringLiteral( "Calling: %1" ).arg( modifiedUrl.toDisplayString( ) ), 4 );
QNetworkRequest request( modifiedUrl );
if ( !mUri.auth().setAuthorization( request ) )
{
mErrorCode = QgsWfsRequest::NetworkError;
mErrorMessage = errorMessageFailedAuth();
QgsMessageLog::logMessage( mErrorMessage, tr( "WFS" ) );
return false;
}
if ( cache )
{
request.setAttribute( QNetworkRequest::CacheLoadControlAttribute, forceRefresh ? QNetworkRequest::AlwaysNetwork : QNetworkRequest::PreferCache );
request.setAttribute( QNetworkRequest::CacheSaveControlAttribute, true );
}
QWaitCondition waitCondition;
QMutex waitConditionMutex;
std::function<bool()> downloaderFunction = [ this, request, synchronous, &waitConditionMutex, &waitCondition ]()
{
if ( QThread::currentThread() != QgsApplication::instance()->thread() )
QgsNetworkAccessManager::instance( Qt::DirectConnection );
bool success = true;
mReply = QgsNetworkAccessManager::instance()->get( request );
mReply->setReadBufferSize( READ_BUFFER_SIZE_HINT );
if ( !mUri.auth().setAuthorizationReply( mReply ) )
{
mErrorCode = QgsWfsRequest::NetworkError;
mErrorMessage = errorMessageFailedAuth();
QgsMessageLog::logMessage( mErrorMessage, tr( "WFS" ) );
waitCondition.wakeAll();
success = false;
}
else
{
// We are able to use direct connection here, because we
// * either run on the thread mReply lives in, so DirectConnection is standard and safe anyway
// * or the owner thread of mReply is currently not doing anything because it's blocked in future.waitForFinished() (if it is the main thread)
connect( mReply, &QNetworkReply::finished, this, &QgsWfsRequest::replyFinished, Qt::DirectConnection );
connect( mReply, &QNetworkReply::downloadProgress, this, &QgsWfsRequest::replyProgress, Qt::DirectConnection );
if ( synchronous )
{
auto resumeMainThread = [&waitConditionMutex, &waitCondition]()
{
waitConditionMutex.lock();
waitCondition.wakeAll();
waitConditionMutex.unlock();
waitConditionMutex.lock();
waitCondition.wait( &waitConditionMutex );
waitConditionMutex.unlock();
};
connect( QgsNetworkAccessManager::instance(), &QgsNetworkAccessManager::authenticationRequired, this, resumeMainThread, Qt::DirectConnection );
connect( QgsNetworkAccessManager::instance(), &QgsNetworkAccessManager::proxyAuthenticationRequired, this, resumeMainThread, Qt::DirectConnection );
#ifndef QT_NO_SSL
connect( QgsNetworkAccessManager::instance(), &QgsNetworkAccessManager::sslErrors, this, resumeMainThread, Qt::DirectConnection );
#endif
QEventLoop loop;
connect( this, &QgsWfsRequest::downloadFinished, &loop, &QEventLoop::quit, Qt::DirectConnection );
loop.exec();
}
}
waitCondition.wakeAll();
return success;
};
bool success;
if ( synchronous && QThread::currentThread() == QApplication::instance()->thread() )
{
std::unique_ptr<DownloaderThread> downloaderThread = qgis::make_unique<DownloaderThread>( downloaderFunction );
downloaderThread->start();
while ( !downloaderThread->isFinished() )
{
waitConditionMutex.lock();
waitCondition.wait( &waitConditionMutex );
waitConditionMutex.unlock();
// If the downloader thread wakes us (the main thread) up and is not yet finished
// he needs the authentication to run.
// The processEvents() call gives the auth manager the chance to show a dialog and
// once done with that, we can wake the downloaderThread again and continue the download.
if ( !downloaderThread->isFinished() )
{
QgsApplication::instance()->processEvents();
waitConditionMutex.lock();
waitCondition.wakeAll();
waitConditionMutex.unlock();
}
}
success = downloaderThread->success();
}
else
{
success = downloaderFunction();
}
return success && mErrorMessage.isEmpty();
}
bool QgsWfsRequest::sendPOST( const QUrl &url, const QString &contentTypeHeader, const QByteArray &data )
{
abort(); // cancel previous
mIsAborted = false;
mTimedout = false;
mGotNonEmptyResponse = false;
mErrorMessage.clear();
mErrorCode = QgsWfsRequest::NoError;
mForceRefresh = true;
mResponse.clear();
if ( url.toEncoded().contains( "fake_qgis_http_endpoint" ) )
{
// Hack for testing purposes
QUrl modifiedUrl( url );
modifiedUrl.addQueryItem( QStringLiteral( "POSTDATA" ), QString::fromUtf8( data ) );
return sendGET( modifiedUrl, true, true, false );
}
QNetworkRequest request( url );
if ( !mUri.auth().setAuthorization( request ) )
{
mErrorCode = QgsWfsRequest::NetworkError;
mErrorMessage = errorMessageFailedAuth();
QgsMessageLog::logMessage( mErrorMessage, tr( "WFS" ) );
return false;
}
request.setHeader( QNetworkRequest::ContentTypeHeader, contentTypeHeader );
mReply = QgsNetworkAccessManager::instance()->post( request, data );
mReply->setReadBufferSize( READ_BUFFER_SIZE_HINT );
if ( !mUri.auth().setAuthorizationReply( mReply ) )
{
mErrorCode = QgsWfsRequest::NetworkError;
mErrorMessage = errorMessageFailedAuth();
QgsMessageLog::logMessage( mErrorMessage, tr( "WFS" ) );
return false;
}
connect( mReply, &QNetworkReply::finished, this, &QgsWfsRequest::replyFinished );
connect( mReply, &QNetworkReply::downloadProgress, this, &QgsWfsRequest::replyProgress );
QEventLoop loop;
connect( this, &QgsWfsRequest::downloadFinished, &loop, &QEventLoop::quit );
loop.exec( QEventLoop::ExcludeUserInputEvents );
return mErrorMessage.isEmpty();
}
void QgsWfsRequest::abort()
{
mIsAborted = true;
if ( mReply )
{
mReply->deleteLater();
mReply = nullptr;
}
}
void QgsWfsRequest::replyProgress( qint64 bytesReceived, qint64 bytesTotal )
{
QgsDebugMsg( QStringLiteral( "%1 of %2 bytes downloaded." ).arg( bytesReceived ).arg( bytesTotal < 0 ? QStringLiteral( "unknown number of" ) : QString::number( bytesTotal ) ) );
if ( bytesReceived != 0 )
mGotNonEmptyResponse = true;
if ( !mIsAborted && mReply )
{
if ( mReply->error() == QNetworkReply::NoError )
{
QVariant redirect = mReply->attribute( QNetworkRequest::RedirectionTargetAttribute );
if ( !redirect.isNull() )
{
// We don't want to emit downloadProgress() for a redirect
return;
}
}
}
emit downloadProgress( bytesReceived, bytesTotal );
}
void QgsWfsRequest::replyFinished()
{
if ( !mIsAborted && mReply )
{
if ( mReply->error() == QNetworkReply::NoError )
{
QgsDebugMsg( QStringLiteral( "reply OK" ) );
QVariant redirect = mReply->attribute( QNetworkRequest::RedirectionTargetAttribute );
if ( !redirect.isNull() )
{
QgsDebugMsg( QStringLiteral( "Request redirected." ) );
const QUrl &toUrl = redirect.toUrl();
mReply->request();
if ( toUrl == mReply->url() )
{
mErrorMessage = tr( "Redirect loop detected: %1" ).arg( toUrl.toString() );
QgsMessageLog::logMessage( mErrorMessage, tr( "WFS" ) );
mResponse.clear();
}
else
{
QNetworkRequest request( toUrl );
if ( !mUri.auth().setAuthorization( request ) )
{
mResponse.clear();
mErrorMessage = errorMessageFailedAuth();
mErrorCode = QgsWfsRequest::NetworkError;
QgsMessageLog::logMessage( mErrorMessage, tr( "WFS" ) );
emit downloadFinished();
return;
}
request.setAttribute( QNetworkRequest::CacheLoadControlAttribute, mForceRefresh ? QNetworkRequest::AlwaysNetwork : QNetworkRequest::PreferCache );
request.setAttribute( QNetworkRequest::CacheSaveControlAttribute, true );
mReply->deleteLater();
mReply = nullptr;
QgsDebugMsg( QStringLiteral( "redirected: %1 forceRefresh=%2" ).arg( redirect.toString() ).arg( mForceRefresh ) );
mReply = QgsNetworkAccessManager::instance()->get( request );
mReply->setReadBufferSize( READ_BUFFER_SIZE_HINT );
if ( !mUri.auth().setAuthorizationReply( mReply ) )
{
mResponse.clear();
mErrorMessage = errorMessageFailedAuth();
mErrorCode = QgsWfsRequest::NetworkError;
QgsMessageLog::logMessage( mErrorMessage, tr( "WFS" ) );
emit downloadFinished();
return;
}
connect( mReply, &QNetworkReply::finished, this, &QgsWfsRequest::replyFinished );
connect( mReply, &QNetworkReply::downloadProgress, this, &QgsWfsRequest::replyProgress );
return;
}
}
else
{
const QgsNetworkAccessManager *nam = QgsNetworkAccessManager::instance();
if ( nam->cache() )
{
QNetworkCacheMetaData cmd = nam->cache()->metaData( mReply->request().url() );
QNetworkCacheMetaData::RawHeaderList hl;
Q_FOREACH ( const QNetworkCacheMetaData::RawHeader &h, cmd.rawHeaders() )
{
if ( h.first != "Cache-Control" )
hl.append( h );
}
cmd.setRawHeaders( hl );
QgsDebugMsg( QStringLiteral( "expirationDate:%1" ).arg( cmd.expirationDate().toString() ) );
if ( cmd.expirationDate().isNull() )
{
cmd.setExpirationDate( QDateTime::currentDateTime().addSecs( defaultExpirationInSec() ) );
}
nam->cache()->updateMetaData( cmd );
}
else
{
QgsDebugMsg( QStringLiteral( "No cache!" ) );
}
#ifdef QGISDEBUG
bool fromCache = mReply->attribute( QNetworkRequest::SourceIsFromCacheAttribute ).toBool();
QgsDebugMsg( QStringLiteral( "Reply was cached: %1" ).arg( fromCache ) );
#endif
mResponse = mReply->readAll();
if ( mResponse.isEmpty() && !mGotNonEmptyResponse )
{
mErrorMessage = tr( "empty response: %1" ).arg( mReply->errorString() );
mErrorCode = QgsWfsRequest::ServerExceptionError;
QgsMessageLog::logMessage( mErrorMessage, tr( "WFS" ) );
}
}
}
else
{
mErrorMessage = errorMessageWithReason( mReply->errorString() );
mErrorCode = QgsWfsRequest::ServerExceptionError;
QgsMessageLog::logMessage( mErrorMessage, tr( "WFS" ) );
mResponse.clear();
}
}
if ( mTimedout )
mErrorCode = QgsWfsRequest::TimeoutError;
if ( mReply )
{
mReply->deleteLater();
mReply = nullptr;
}
emit downloadFinished();
}
QString QgsWfsRequest::errorMessageFailedAuth()
{
return errorMessageWithReason( tr( "network request update failed for authentication config" ) );
}