Upload image to azure storage using Qt/c++ - c++

Question

Can anyone help me to upload image to azure storage using qt/c++
here's my code. it seems to have an error on constructing the headers.*
QByteArray data;
QFile file("Bg.jpg");
if (file.open(QIODevice::ReadOnly))
{
data.append(file.readAll()); //let's read the file
}
QString date = QDateTime::currentDateTime().toString("ddd, d MMM yyyy HH:mm:ss") + " GMT";
QString header = QString("PUT\n\n\n%1\n\n\n\n\n\n\n\n\nx-ms-blob-type:BlockBlob\nx-ms-date:%2\nx-ms-version:2013-08-15\n/mycontainer/todate/").arg(data.length()).arg(date);
QString urlUri = "http://myaccount.blob.core.windows.net/mycontainer/todate";
QByteArray ba = header.toUtf8();
unsigned char* signature = reinterpret_cast<unsigned char*>(ba.data());
QByteArray kba =
QByteArray::fromBase64("key");
unsigned char* key = (unsigned char*) kba.data();
unsigned char result[EVP_MAX_MD_SIZE];
unsigned int result_len;
ENGINE_load_builtin_engines();
ENGINE_register_all_complete();
HMAC_CTX ctx;
HMAC_CTX_init(&ctx);
HMAC_Init_ex(&ctx, key, strlen((const char*)key), EVP_sha256(), NULL);
HMAC_Update(&ctx, signature, strlen((const char*)signature));
HMAC_Final(&ctx, result, &result_len);
HMAC_CTX_cleanup(&ctx);
QByteArray array = QByteArray::fromRawData((char*)result, result_len);
array = array.toBase64();
String version = "2013-08-15";
QNetworkAccessManager* manager = new QNetworkAccessManager();
QNetworkRequest request;
request.setUrl(QUrl(urlUri));
request.setRawHeader("Content- Length",QString::number(data.length()).toStdString().c_str());
request.setRawHeader("Content-Type","application/octet-stream");
request.setRawHeader("x-ms-blob-type","BlockBlob");
request.setRawHeader("x-ms-date", date.toStdString().c_str());
request.setRawHeader("x-ms-version", version.toStdString().c_str());
request.setRawHeader("Authorization","SharedKey myaccount:"+array);
manager->post(request,data);
connect(manager, SIGNAL(finished(QNetworkReply*)), this,SLOT(manageCloudReply(QNetworkReply*)));
and this is the response on the request
AuthenticationFailed Server failed to authenticate the request. Make sure the value of Authorization header is formed correctly including the signature.
RequestId:82eb03cb-adf1-4797-bbc0-86c3e5ca3ec6
Time:2014-03-19T03:52:35.4790761ZThe MAC signature found in the HTTP request '3Dk7laN3XW+ASbQj0XddfmSnnuYfVSkhg/oRfSJekKY=' is not the same as any computed signature. Server used following string to sign: 'POST
87163
application/octet-stream
x-ms-blob-type:BlockBlob
x-ms-date:Wed, 19 Mar 2014 11:52:05 GMT
x-ms-version:2013-08-15
/logboxstorage/mycontainer/todate'.
any help will be appreciated..thanks!!!!

Answer 1

Looking at the following line of code:
QString header = QString("PUT\n\n\n%1\n\n\n\n\n\n\n\n\nx-ms-blob-type:BlockBlob\nx-ms-date:%2\nx-ms-version:2013-08-15\n/mycontainer/todate/").arg(data.length()).arg(date);
I see an extra slash (/) in mycontainer/todate/. Can you try by removing that?
Also look at the following code:
QString date = QDateTime::currentDateTime().toString("ddd, d MMM yyyy HH:mm:ss") + " GMT";
currentDateTime() will return the local date/time based on your computer. It should be UTC/GMT date/time. Try using currentDateTimeUtc().
Another thing I noticed is that your request is going as POST to the server. It should be a PUT request.