Posting images to AWS S3 with QNetworkAccessManager PUT (Android)

[marinadel]

Network byte order is big-endian. Android is little-endian, so it is possible that your hash() call is generating a little-endian QByteArray. So try this:

#include <QtEndian>
 
QByteArray AndroidTemp = QMessageAuthenticationCode::hash(StringToSign, SecretKey, QCryptographicHash::Sha1);
QByteArray AndroidString = AndroidTemp.toBase64();  // for comparison purposes
 
QByteArray SignTemp( AndroidString );  // copy so the two arrays are the same size
qToBigEndian( &AndroidTemp, AndroidTemp.size(), &SignTemp );
 
QByteArray SignString = SignTemp.toBase64();

#include <QtEndian>

QByteArray AndroidTemp = QMessageAuthenticationCode::hash(StringToSign, SecretKey, QCryptographicHash::Sha1);
QByteArray AndroidString = AndroidTemp.toBase64();  // for comparison purposes

QByteArray SignTemp( AndroidString );  // copy so the two arrays are the same size
qToBigEndian( &AndroidTemp, AndroidTemp.size(), &SignTemp );

QByteArray SignString = SignTemp.toBase64();

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Are SignString and AndroidString the same? If so, then hash() is generating a big-endian array. If not, then it is probably little-endian.
Try sending this version of SignString to AWS

thank you for your reply - turned out my issue with signature was caused by the double slashes in StringToSign so replacing \\n with \n solved it - I am not getting any more errors but m_reply->readAll() now returns an empty string, no errors are reported by errorOccurred signal and nothing gets posted to s3. so not sure what is wrong now

[d_stranz]

I am not getting any more errors but m_reply->readAll() now returns an empty string

From what I read in the docs about QNetworkReply, the finished() signal is emitted after the put() request is completely done. So by the time you see that, all of the reply has been sent and there is nothing more to read.

I think what you need to do is the handle the QIODevice::readyRead() signal and in your slot retrieve all of the pending data and put it onto the end of a buffer. Keep doing that until you receive the finished() signal, at which point you know you have received everything the server is going to send.