AWS query through Qt (mac - OSX) is not getting any result - c++

Question

I'm currently trying to create a C++ program to track prices for a bunch of ASINs.
I'm using C++ with Qt (Version 5.5), compiling on mac OSX through Xcode (5.1.1).
When compiling, it's running but no output is given. I have the following warning message instead (I encrypted AccessKey & AssociateTag for privacy reasons as "/////////////")
*QUrl("http://ecs.amazonaws.com/onca/xml?AWSAccessKeyId=///////////////&AssociateTag=/////////////&ItemId=B00181T20O&Operation=ItemLookup&ResponseGroup=OfferSummary&Service=AWSECommerceService&Signature=1K69SLmTkZ9hZwwt5ualR4uDRwY%3D&SignatureMethod=HmacSHA1&Timestamp=2017-01-04T10%3A21%3A46Z")
qt.network.ssl: Error receiving trust for a CA certificate
qt.network.ssl: Error receiving trust for a CA certificate
qt.network.ssl: Error receiving trust for a CA certificate
qt.network.ssl: Error receiving trust for a CA certificate
qt.network.ssl: Error receiving trust for a CA certificate
qt.network.ssl: Error receiving trust for a CA certificate
qt.network.ssl: Error receiving trust for a CA certificate
qt.network.ssl: Error receiving trust for a CA certificate
qt.network.ssl: Error receiving trust for a CA certificate
qt.network.ssl: Error receiving trust for a CA certificate
"<?xml version=\"1.0\"?>\n<ItemLookupErrorResponse
xmlns=\"http://ecs.amazonaws.com/doc/2005-10-05/\"><Error>
<Code>SignatureDoesNotMatch</Code><Message>The request signature we calculated
does not match the signature you provided. Check your AWS Secret Access Key and
signing method. Consult the service documentation for details.</Message></Error>
<RequestId>f4626242-a110-43f1-9b56-b8a696b3f299</RequestId>
</ItemLookupErrorResponse>"
RET:
("", "")*
To test it again, I copied URL (first few rows of warning message) in the browser and I get the same error as well:
"The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details."
Can anyone give me a hint of what's wrong in the URL?
Thanks in advance!

Answer 1

this is the most relevant part of the code. I suspect I cannot embed .zip file
AWSQueryRequest::AWSQueryRequest(QObject *parent) :
QObject(parent)
{
m_netManager = new QNetworkAccessManager(this);
}
QString AWSQueryRequest::hmacSha1(QByteArray key, QByteArray baseString)
{
int blockSize = 64; // HMAC-SHA-1 block size, defined in SHA-1 standard
if (key.length() > blockSize)
{
// if key is longer than block size (64), reduce key length with SHA-1 compression
key = QCryptographicHash::hash(key, QCryptographicHash::Sha1);
}
QByteArray innerPadding(blockSize, char(0x36)); // initialize inner padding with char "6"
QByteArray outerPadding(blockSize, char(0x5c)); // initialize outer padding with char "quot;
// ascii characters 0x36 ("6") and 0x5c ("quot;) are selected because they have large
// Hamming distance (http://en.wikipedia.org/wiki/Hamming_distance)
for (int i = 0; i < key.length(); i++)
{
innerPadding[i] = innerPadding[i] ^ key.at(i); // XOR operation between every byte in key and innerpadding, of key length
outerPadding[i] = outerPadding[i] ^ key.at(i); // XOR operation between every byte in key and outerpadding, of key length
}
// result = hash ( outerPadding CONCAT hash ( innerPadding CONCAT baseString ) ).toBase64
QByteArray total = outerPadding;
QByteArray part = innerPadding;
part.append(baseString);
total.append(QCryptographicHash::hash(part, QCryptographicHash::Sha1));
QByteArray hashed = QCryptographicHash::hash(total, QCryptographicHash::Sha1);
return hashed.toBase64();
}
QByteArray AWSQueryRequest::getTimeStamp()
{
QDateTime dateTime = QDateTime::currentDateTimeUtc();
return dateTime.toString(Qt::ISODate).toUtf8();
}
QByteArray AWSQueryRequest::createSignature(const QMap<QString,QString> & queryItems)
{
QUrl url(END_POINT);
QString stringToSign = "GET\n";
stringToSign.append(url.host() + "\n");
stringToSign.append(url.path() + "\n");
QList<QString> keys = queryItems.keys();
for( int i=0; i < keys.count() ; ++i )
{
stringToSign.append(keys[i]+"="+queryItems[keys[i]]);
if( i != keys.count() -1 )
stringToSign.append("&");
}
QString signature = hmacSha1(AWS_PASS, stringToSign.toUtf8());
return QUrl::toPercentEncoding(signature);
}
#if 0
QByteArray AWSQueryRequest::createSignature(const QList< QPair<QString,QString> > & queryItems)
{
QUrl url(END_POINT);
QString stringToSign = "GET\n";
stringToSign.append(url.host() + "\n");
stringToSign.append(url.path() + "\n");
for (int i=0; i<queryItems.count(); ++i)
{
QPair<QString,QString> pairValue = queryItems[i];
stringToSign.append(pairValue.first+"="+pairValue.second);
if( i != queryItems.count() -1)
stringToSign.append("&");
}
QString signature = hmacSha1(AWS_PASS, stringToSign.toUtf8());
return QUrl::toPercentEncoding(signature);
}
#endif
QUrl AWSQueryRequest::createUrl( const QMap< QString,QString >& queryItems )
{
QUrl url(END_POINT);
QUrlQuery query;
QMapIterator<QString, QString> it(queryItems);
while (it.hasNext())
{
it.next();
query.addQueryItem(it.key().toUtf8(), it.value().toUtf8());
}
url.setQuery(query);
return url;
}