179 lines
3.7 KiB
C++
179 lines
3.7 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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namespace
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{
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QPixmap scale(QPixmap pixmap)
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{
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return pixmap.scaled(FaviconCache::getIconSize(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
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}
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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[file] = scale(pixmap);
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}
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}
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}
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}
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/***
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****
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***/
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QString FaviconCache::getDisplayName(QUrl const& url)
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{
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return getDisplayName(getKey(url));
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}
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QString FaviconCache::getDisplayName(QString const& key)
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{
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auto name = key;
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name[0] = name.at(0).toTitleCase();
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return name;
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}
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QString FaviconCache::getKey(QUrl const& url)
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{
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auto host = url.host();
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// remove tld
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auto const suffix = url.topLevelDomain();
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host.truncate(host.size() - suffix.size());
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// remove subdomain
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auto const pos = host.indexOf(QLatin1Char('.'));
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return pos < 0 ? host : host.remove(0, pos + 1);
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}
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QString FaviconCache::getKey(QString const& displayName)
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{
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return displayName.toLower();
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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(QString const& key)
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{
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ensureCacheDirHasBeenScanned();
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return myPixmaps[key];
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}
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QString FaviconCache::add(QUrl const& url)
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{
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ensureCacheDirHasBeenScanned();
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QString const key = getKey(url);
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if (myPixmaps.count(key) == 0)
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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[key] = QPixmap();
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// try to download the favicon
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QString const path = QLatin1String("http://") + url.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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return key;
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}
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void FaviconCache::onRequestFinished(QNetworkReply* reply)
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{
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auto const key = getKey(reply->url());
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QPixmap pixmap;
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QByteArray const content = reply->readAll();
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if (reply->error() == QNetworkReply::NoError)
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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[key] = scale(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(key));
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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(key);
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}
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}
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