mirror of
https://github.com/transmission/transmission
synced 2024-12-24 08:43:27 +00:00
152 lines
3.4 KiB
C++
152 lines
3.4 KiB
C++
/*
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* This file Copyright (C) Mnemosyne LLC
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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*
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* $Id$
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*/
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#include <QDesktopServices>
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#include <QDir>
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#include <QNetworkAccessManager>
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#include <QNetworkReply>
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#include <QNetworkRequest>
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#include "favicon.h"
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/***
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****
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***/
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Favicons :: Favicons( )
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{
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myNAM = new QNetworkAccessManager( );
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connect( myNAM, SIGNAL(finished(QNetworkReply*)), this, SLOT(onRequestFinished(QNetworkReply*)) );
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}
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Favicons :: ~Favicons( )
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{
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delete myNAM;
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}
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/***
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****
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***/
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QString
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Favicons :: getCacheDir( )
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{
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const QString base = QDesktopServices::storageLocation( QDesktopServices::CacheLocation );
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return QDir( base ).absoluteFilePath( "favicons" );
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}
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void
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Favicons :: ensureCacheDirHasBeenScanned( )
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{
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static bool hasBeenScanned = false;
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if( !hasBeenScanned )
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{
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hasBeenScanned = true;
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QDir cacheDir( getCacheDir( ) );
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cacheDir.mkpath( cacheDir.absolutePath( ) );
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QStringList files = cacheDir.entryList( QDir::Files|QDir::Readable );
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foreach( QString file, files ) {
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QPixmap pixmap;
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pixmap.load( cacheDir.absoluteFilePath( file ) );
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if( !pixmap.isNull( ) )
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myPixmaps.insert( file, pixmap );
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}
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}
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}
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QString
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Favicons :: getHost( const QUrl& url )
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{
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QString host = url.host( );
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const int first_dot = host.indexOf( '.' );
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const int last_dot = host.lastIndexOf( '.' );
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if( ( first_dot != -1 ) && ( last_dot != -1 ) && ( first_dot != last_dot ) )
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host.remove( 0, first_dot + 1 );
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return host;
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}
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QPixmap
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Favicons :: find( const QUrl& url )
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{
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return findFromHost( getHost( url ) );
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}
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namespace
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{
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const QSize rightSize( 16, 16 );
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};
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QPixmap
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Favicons :: findFromHost( const QString& host )
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{
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ensureCacheDirHasBeenScanned( );
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const QPixmap pixmap = myPixmaps[ host ];
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return pixmap.size()==rightSize ? pixmap : pixmap.scaled(rightSize);
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}
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void
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Favicons :: add( const QUrl& url )
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{
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ensureCacheDirHasBeenScanned( );
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const QString host = getHost( url );
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if( !myPixmaps.contains( host ) )
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{
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// add a placholder s.t. we only ping the server once per session
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QPixmap tmp( rightSize );
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tmp.fill( Qt::transparent );
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myPixmaps.insert( host, tmp );
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// try to download the favicon
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const QString path = "http://" + host + "/favicon.";
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QStringList suffixes;
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suffixes << "ico" << "png" << "gif" << "jpg";
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foreach( QString suffix, suffixes )
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myNAM->get( QNetworkRequest( path + suffix ) );
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}
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}
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void
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Favicons :: onRequestFinished( QNetworkReply * reply )
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{
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const QString host = reply->url().host();
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QPixmap pixmap;
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const QByteArray content = reply->readAll( );
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if( !reply->error( ) )
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pixmap.loadFromData( content );
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if( !pixmap.isNull( ) )
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{
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// save it in memory...
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myPixmaps.insert( host, pixmap );
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// save it on disk...
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QDir cacheDir( getCacheDir( ) );
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cacheDir.mkpath( cacheDir.absolutePath( ) );
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QFile file( cacheDir.absoluteFilePath( host ) );
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file.open( QIODevice::WriteOnly );
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file.write( content );
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file.close( );
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// notify listeners
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emit pixmapReady( host );
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}
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}
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