153 lines
3.3 KiB
C++
153 lines
3.3 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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#include <QStandardPaths>
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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 FaviconCache::getCacheDir()
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{
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QString const base = QStandardPaths::writableLocation(QStandardPaths::CacheLocation);
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return QDir(base).absoluteFilePath(QLatin1String("favicons"));
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}
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void 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 (QString const& 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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{
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myPixmaps.insert(file, pixmap);
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}
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}
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}
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}
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QString FaviconCache::getHost(QUrl const& url)
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{
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QString host = url.host();
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int const first_dot = host.indexOf(QLatin1Char('.'));
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int const last_dot = host.lastIndexOf(QLatin1Char('.'));
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if ((first_dot != -1) && (last_dot != -1) && (first_dot != last_dot))
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{
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host.remove(0, first_dot + 1);
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}
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return host;
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}
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QSize FaviconCache::getIconSize()
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{
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return QSize(16, 16);
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}
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QPixmap FaviconCache::find(QUrl const& url)
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{
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return findFromHost(getHost(url));
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}
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QPixmap FaviconCache::findFromHost(QString const& host)
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{
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ensureCacheDirHasBeenScanned();
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return myPixmaps[host];
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}
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void FaviconCache::add(QUrl const& url)
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{
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ensureCacheDirHasBeenScanned();
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QString const 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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QString const 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 (QString const& suffix : suffixes)
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{
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myNAM->get(QNetworkRequest(path + suffix));
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}
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}
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}
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void FaviconCache::onRequestFinished(QNetworkReply* reply)
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{
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QString const host = reply->url().host();
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QPixmap pixmap;
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QByteArray const content = reply->readAll();
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if (!reply->error())
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{
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pixmap.loadFromData(content);
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}
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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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