Clementine-audio-player-Mac.../src/covers/amazoncoverprovider.cpp

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/* This file is part of Clementine.
Copyright 2010, David Sansome <me@davidsansome.com>
Clementine is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Clementine is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Clementine. If not, see <http://www.gnu.org/licenses/>.
*/
#include "amazoncoverprovider.h"
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#include "core/closure.h"
#include "core/logging.h"
#include "core/network.h"
#include "core/utilities.h"
#include <QDateTime>
#include <QNetworkReply>
#include <QStringList>
#include <QXmlStreamReader>
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// Amazon has a web crawler that looks for access keys in public source code,
// so we apply some sophisticated encryption to these keys.
const char* AmazonCoverProvider::kAccessKeyB64 = "QUtJQUlRSDI2UlZNNlVaNFdBNlE=";
const char* AmazonCoverProvider::kSecretAccessKeyB64 =
"ZTQ2UGczM0JRNytDajd4MWR6eFNvODVFd2tpdi9FbGVCcUZjMkVmMQ==";
const char* AmazonCoverProvider::kUrl = "http://ecs.amazonaws.com/onca/xml";
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const char* AmazonCoverProvider::kAssociateTag = "clemmusiplay-20";
AmazonCoverProvider::AmazonCoverProvider(QObject* parent)
: CoverProvider("Amazon", parent),
network_(new NetworkAccessManager(this)) {}
bool AmazonCoverProvider::StartSearch(const QString& artist,
const QString& album, int id) {
typedef QPair<QString, QString> Arg;
typedef QList<Arg> ArgList;
typedef QPair<QByteArray, QByteArray> EncodedArg;
typedef QList<EncodedArg> EncodedArgList;
// Must be sorted by parameter name
ArgList args =
ArgList() << Arg("AWSAccessKeyId", QByteArray::fromBase64(kAccessKeyB64))
<< Arg("AssociateTag", kAssociateTag)
<< Arg("Keywords", artist + " " + album)
<< Arg("Operation", "ItemSearch")
<< Arg("ResponseGroup", "Images") << Arg("SearchIndex", "All")
<< Arg("Service", "AWSECommerceService")
<< Arg("Timestamp", QDateTime::currentDateTime().toString(
"yyyy-MM-ddThh:mm:ss.zzzZ"))
<< Arg("Version", "2009-11-01");
EncodedArgList encoded_args;
QStringList query_items;
// Encode the arguments
for (const Arg& arg : args) {
EncodedArg encoded_arg(QUrl::toPercentEncoding(arg.first),
QUrl::toPercentEncoding(arg.second));
encoded_args << encoded_arg;
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query_items << QString(encoded_arg.first + "=" + encoded_arg.second);
}
// Sign the request
QUrl url(kUrl);
const QByteArray data_to_sign =
QString("GET\n%1\n%2\n%3")
.arg(url.host(), url.path(), query_items.join("&"))
.toAscii();
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const QByteArray signature(Utilities::HmacSha256(
QByteArray::fromBase64(kSecretAccessKeyB64), data_to_sign));
// Add the signature to the request
encoded_args << EncodedArg("Signature",
QUrl::toPercentEncoding(signature.toBase64()));
url.setEncodedQueryItems(encoded_args);
QNetworkReply* reply = network_->get(QNetworkRequest(url));
NewClosure(reply, SIGNAL(finished()), this,
SLOT(QueryFinished(QNetworkReply*, int)), reply, id);
return true;
}
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void AmazonCoverProvider::QueryFinished(QNetworkReply* reply, int id) {
reply->deleteLater();
CoverSearchResults results;
QXmlStreamReader reader(reply);
while (!reader.atEnd()) {
reader.readNext();
if (reader.tokenType() == QXmlStreamReader::StartElement &&
reader.name() == "Item") {
ReadItem(&reader, &results);
}
}
emit SearchFinished(id, results);
}
void AmazonCoverProvider::ReadItem(QXmlStreamReader* reader,
CoverSearchResults* results) {
while (!reader->atEnd()) {
switch (reader->readNext()) {
case QXmlStreamReader::StartElement:
if (reader->name() == "LargeImage") {
ReadLargeImage(reader, results);
} else {
reader->skipCurrentElement();
}
break;
case QXmlStreamReader::EndElement:
return;
default:
break;
}
}
}
void AmazonCoverProvider::ReadLargeImage(QXmlStreamReader* reader,
CoverSearchResults* results) {
while (!reader->atEnd()) {
switch (reader->readNext()) {
case QXmlStreamReader::StartElement:
if (reader->name() == "URL") {
CoverSearchResult result;
result.image_url = QUrl(reader->readElementText());
results->append(result);
} else {
reader->skipCurrentElement();
}
break;
case QXmlStreamReader::EndElement:
return;
default:
break;
}
}
}