169 lines
3.6 KiB
C++
169 lines
3.6 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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nam_(new QNetworkAccessManager(this))
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{
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connect(nam_, SIGNAL(finished(QNetworkReply*)), this, SLOT(onRequestFinished(QNetworkReply*)));
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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(QStringLiteral("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 has_been_scanned = false;
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if (!has_been_scanned)
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{
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has_been_scanned = true;
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QDir cache_dir(getCacheDir());
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cache_dir.mkpath(cache_dir.absolutePath());
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QStringList files = cache_dir.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(cache_dir.absoluteFilePath(file));
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if (!pixmap.isNull())
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{
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pixmaps_[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(Key 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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FaviconCache::Key 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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FaviconCache::Key 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(Key const& key)
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{
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ensureCacheDirHasBeenScanned();
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return pixmaps_[key];
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}
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FaviconCache::Key FaviconCache::add(QUrl const& url)
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{
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ensureCacheDirHasBeenScanned();
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Key const key = getKey(url);
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if (pixmaps_.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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pixmaps_[key] = QPixmap();
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// try to download the favicon
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QString const path = QStringLiteral("http://") + url.host() + QStringLiteral("/favicon.");
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QStringList suffixes;
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suffixes << QStringLiteral("ico") << QStringLiteral("png") << QStringLiteral("gif") << QStringLiteral("jpg");
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for (QString const& suffix : suffixes)
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{
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nam_->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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pixmaps_[key] = scale(pixmap);
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// save it on disk...
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QDir cache_dir(getCacheDir());
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cache_dir.mkpath(cache_dir.absolutePath());
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QFile file(cache_dir.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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