transmission/qt/favicon.cc

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