transmission/qt/FaviconCache.cc

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/*
* This file Copyright (C) 2012-2015 Mnemosyne LLC
*
* It may be used under the GNU GPL versions 2 or 3
* or any future license endorsed by Mnemosyne LLC.
*
*/
#include <QDir>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QNetworkRequest>
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#include <QStandardPaths>
#include "FaviconCache.h"
/***
****
***/
FaviconCache::FaviconCache()
{
myNAM = new QNetworkAccessManager();
connect(myNAM, SIGNAL(finished(QNetworkReply*)), this, SLOT(onRequestFinished(QNetworkReply*)));
}
FaviconCache::~FaviconCache()
{
delete myNAM;
}
/***
****
***/
QString FaviconCache::getCacheDir()
{
QString const base = QStandardPaths::writableLocation(QStandardPaths::CacheLocation);
return QDir(base).absoluteFilePath(QLatin1String("favicons"));
}
void FaviconCache::ensureCacheDirHasBeenScanned()
{
static bool hasBeenScanned = false;
if (!hasBeenScanned)
{
hasBeenScanned = true;
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QDir cacheDir(getCacheDir());
cacheDir.mkpath(cacheDir.absolutePath());
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QStringList files = cacheDir.entryList(QDir::Files | QDir::Readable);
for (QString const& file : files)
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{
QPixmap pixmap;
pixmap.load(cacheDir.absoluteFilePath(file));
if (!pixmap.isNull())
{
myPixmaps.insert(file, pixmap);
}
}
}
}
QString FaviconCache::getHost(QUrl const& url)
{
QString host = url.host();
int const first_dot = host.indexOf(QLatin1Char('.'));
int const last_dot = host.lastIndexOf(QLatin1Char('.'));
if (first_dot != -1 && last_dot != -1 && first_dot != last_dot)
{
host.remove(0, first_dot + 1);
}
return host;
}
QSize FaviconCache::getIconSize()
{
return QSize(16, 16);
}
QPixmap FaviconCache::find(QUrl const& url)
{
return findFromHost(getHost(url));
}
QPixmap FaviconCache::findFromHost(QString const& host)
{
ensureCacheDirHasBeenScanned();
return myPixmaps[host];
}
void FaviconCache::add(QUrl const& url)
{
ensureCacheDirHasBeenScanned();
QString const host = getHost(url);
if (!myPixmaps.contains(host))
{
// add a placholder s.t. we only ping the server once per session
myPixmaps.insert(host, QPixmap());
// try to download the favicon
QString const path = QLatin1String("http://") + host + QLatin1String("/favicon.");
QStringList suffixes;
suffixes << QLatin1String("ico") << QLatin1String("png") << QLatin1String("gif") << QLatin1String("jpg");
for (QString const& suffix : suffixes)
{
myNAM->get(QNetworkRequest(path + suffix));
}
}
}
void FaviconCache::onRequestFinished(QNetworkReply* reply)
{
QString const host = reply->url().host();
QPixmap pixmap;
QByteArray const content = reply->readAll();
if (reply->error() == QNetworkReply::NoError)
{
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);
}
}