mirror of
https://github.com/transmission/transmission
synced 2024-12-25 01:03:01 +00:00
160 lines
3.5 KiB
C++
160 lines
3.5 KiB
C++
/*
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* This file Copyright (C) 2012-2015 Mnemosyne LLC
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*
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* It may be used under the GNU GPL versions 2 or 3
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* or any future license endorsed by Mnemosyne LLC.
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*
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*/
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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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#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
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#include <QDesktopServices>
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#else
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#include <QStandardPaths>
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#endif
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#include "FaviconCache.h"
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/***
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****
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***/
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FaviconCache::FaviconCache ()
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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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FaviconCache::~FaviconCache ()
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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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FaviconCache::getCacheDir ()
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{
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const QString base =
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#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
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QDesktopServices::storageLocation (QDesktopServices::CacheLocation);
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#else
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QStandardPaths::writableLocation (QStandardPaths::CacheLocation);
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#endif
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return QDir(base).absoluteFilePath (QLatin1String ("favicons"));
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}
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void
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FaviconCache::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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for (const QString& file: files)
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{
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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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FaviconCache::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 (QLatin1Char ('.'));
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const int last_dot = host.lastIndexOf (QLatin1Char ('.'));
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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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QSize
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FaviconCache::getIconSize ()
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{
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return QSize (16, 16);
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}
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QPixmap
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FaviconCache::find (const QUrl& url)
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{
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return findFromHost (getHost (url));
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}
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QPixmap
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FaviconCache::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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const QSize rightSize = getIconSize ();
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return pixmap.isNull () || pixmap.size () == rightSize ? pixmap : pixmap.scaled (rightSize);
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}
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void
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FaviconCache::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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myPixmaps.insert (host, QPixmap ());
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// try to download the favicon
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const QString path = QLatin1String ("http://") + host + QLatin1String ("/favicon.");
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QStringList suffixes;
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suffixes << QLatin1String ("ico") << QLatin1String ("png") << QLatin1String ("gif") << QLatin1String ("jpg");
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for (const 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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FaviconCache::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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