QByteArray QgsSvgCache::getImageData( const QString &path ) const
{
// is it a path to local file?
QFile svgFile( path );
if ( svgFile.exists() )
{
if ( svgFile.open( QIODevice::ReadOnly ) )
{
return svgFile.readAll();
}
else
{
return QByteArray();
}
}
// maybe it's a url...
if ( !path.contains( "://" ) ) // otherwise short, relative SVG paths might be considered URLs
{
return QByteArray();
}
QUrl svgUrl( path );
if ( !svgUrl.isValid() )
{
return QByteArray();
}
// check whether it's a url pointing to a local file
if ( svgUrl.scheme().compare( "file", Qt::CaseInsensitive ) == 0 )
{
svgFile.setFileName( svgUrl.toLocalFile() );
if ( svgFile.exists() )
{
if ( svgFile.open( QIODevice::ReadOnly ) )
{
return svgFile.readAll();
}
}
// not found...
return QByteArray();
}
// the url points to a remote resource, download it!
QNetworkReply *reply = 0;
// The following code blocks until the file is downloaded...
// TODO: use signals to get reply finished notification, in this moment
// it's executed while rendering.
while ( 1 )
{
QgsDebugMsg( QString( "get svg: %1" ).arg( svgUrl.toString() ) );
QNetworkRequest request( svgUrl );
request.setAttribute( QNetworkRequest::CacheLoadControlAttribute, QNetworkRequest::PreferCache );
request.setAttribute( QNetworkRequest::CacheSaveControlAttribute, true );
reply = QgsNetworkAccessManager::instance()->get( request );
connect( reply, SIGNAL( downloadProgress( qint64, qint64 ) ), this, SLOT( downloadProgress( qint64, qint64 ) ) );
//emit statusChanged( tr( "Downloading svg." ) );
// wait until the image download finished
// TODO: connect to the reply->finished() signal
while ( !reply->isFinished() )
{
QCoreApplication::processEvents( QEventLoop::ExcludeUserInputEvents, 500 );
}
if ( reply->error() != QNetworkReply::NoError )
{
QgsMessageLog::logMessage( tr( "SVG request failed [error: %1 - url: %2]" ).arg( reply->errorString() ).arg( reply->url().toString() ), tr( "SVG" ) );
reply->deleteLater();
return QByteArray();
}
QVariant redirect = reply->attribute( QNetworkRequest::RedirectionTargetAttribute );
if ( redirect.isNull() )
{
// neither network error nor redirection
// TODO: cache the image
break;
}
// do a new request to the redirect url
svgUrl = redirect.toUrl();
reply->deleteLater();
}
QVariant status = reply->attribute( QNetworkRequest::HttpStatusCodeAttribute );
if ( !status.isNull() && status.toInt() >= 400 )
{
QVariant phrase = reply->attribute( QNetworkRequest::HttpReasonPhraseAttribute );
QgsMessageLog::logMessage( tr( "SVG request error [status: %1 - reason phrase: %2]" ).arg( status.toInt() ).arg( phrase.toString() ), tr( "SVG" ) );
reply->deleteLater();
return QByteArray();
}
QString contentType = reply->header( QNetworkRequest::ContentTypeHeader ).toString();
QgsDebugMsg( "contentType: " + contentType );
if ( !contentType.startsWith( "image/svg+xml", Qt::CaseInsensitive ) )
{
reply->deleteLater();
return QByteArray();
}
// read the image data
QByteArray ba = reply->readAll();
reply->deleteLater();
return ba;
}
QByteArray QgsSvgCache::getImageData( const QString &path ) const
{
// is it a path to local file?
QFile svgFile( path );
if ( svgFile.exists() )
{
if ( svgFile.open( QIODevice::ReadOnly ) )
{
return svgFile.readAll();
}
else
{
return mMissingSvg;
}
}
// maybe it's an embedded base64 string
if ( path.startsWith( QLatin1String( "base64:" ), Qt::CaseInsensitive ) )
{
QByteArray base64 = path.mid( 7 ).toLocal8Bit(); // strip 'base64:' prefix
return QByteArray::fromBase64( base64, QByteArray::OmitTrailingEquals );
}
// maybe it's a url...
if ( !path.contains( QLatin1String( "://" ) ) ) // otherwise short, relative SVG paths might be considered URLs
{
return mMissingSvg;
}
QUrl svgUrl( path );
if ( !svgUrl.isValid() )
{
return mMissingSvg;
}
// check whether it's a url pointing to a local file
if ( svgUrl.scheme().compare( QLatin1String( "file" ), Qt::CaseInsensitive ) == 0 )
{
svgFile.setFileName( svgUrl.toLocalFile() );
if ( svgFile.exists() )
{
if ( svgFile.open( QIODevice::ReadOnly ) )
{
return svgFile.readAll();
}
}
// not found...
return mMissingSvg;
}
QMutexLocker locker( &mMutex );
// already a request in progress for this url
if ( mPendingRemoteUrls.contains( path ) )
return mFetchingSvg;
if ( mRemoteContentCache.contains( path ) )
{
// already fetched this content - phew. Just return what we already got.
return *mRemoteContentCache[ path ];
}
mPendingRemoteUrls.insert( path );
//fire up task to fetch image in background
QNetworkRequest request( svgUrl );
request.setAttribute( QNetworkRequest::CacheLoadControlAttribute, QNetworkRequest::PreferCache );
request.setAttribute( QNetworkRequest::CacheSaveControlAttribute, true );
QgsNetworkContentFetcherTask *task = new QgsNetworkContentFetcherTask( request );
connect( task, &QgsNetworkContentFetcherTask::fetched, this, [this, task, path]
{
QMutexLocker locker( &mMutex );
QNetworkReply *reply = task->reply();
if ( !reply )
{
// canceled
QMetaObject::invokeMethod( const_cast< QgsSvgCache * >( this ), "onRemoteSvgFetched", Qt::QueuedConnection, Q_ARG( QString, path ), Q_ARG( bool, false ) );
return;
}
if ( reply->error() != QNetworkReply::NoError )
{
QgsMessageLog::logMessage( tr( "SVG request failed [error: %1 - url: %2]" ).arg( reply->errorString(), path ), tr( "SVG" ) );
return;
}
bool ok = true;
QVariant status = reply->attribute( QNetworkRequest::HttpStatusCodeAttribute );
if ( !status.isNull() && status.toInt() >= 400 )
{
QVariant phrase = reply->attribute( QNetworkRequest::HttpReasonPhraseAttribute );
QgsMessageLog::logMessage( tr( "SVG request error [status: %1 - reason phrase: %2] for %3" ).arg( status.toInt() ).arg( phrase.toString(), path ), tr( "SVG" ) );
mRemoteContentCache.insert( path, new QByteArray( mMissingSvg ) );
ok = false;
}
// we accept both real SVG mime types AND plain text types - because some sites
// (notably github) serve up svgs as raw text
QString contentType = reply->header( QNetworkRequest::ContentTypeHeader ).toString();
if ( !contentType.startsWith( QLatin1String( "image/svg+xml" ), Qt::CaseInsensitive )
&& !contentType.startsWith( QLatin1String( "text/plain" ), Qt::CaseInsensitive ) )
{
QgsMessageLog::logMessage( tr( "Unexpected MIME type %1 received for %2" ).arg( contentType, path ), tr( "SVG" ) );
mRemoteContentCache.insert( path, new QByteArray( mMissingSvg ) );
ok = false;
}
if ( ok )
{
// read the image data
mRemoteContentCache.insert( path, new QByteArray( reply->readAll() ) );
}
QMetaObject::invokeMethod( const_cast< QgsSvgCache * >( this ), "onRemoteSvgFetched", Qt::QueuedConnection, Q_ARG( QString, path ), Q_ARG( bool, true ) );
} );
