QOAuth2AuthorizationCodeFlow fails without message. How to debug?

aphot

Hi,

I am trying to connect with the digikey webshop though my application. It worked very well for months until now. I didn't even recompiled the binary, so I don't know what changed, whether it was the shop or maybe an windows-update interfered in the past.
Some Facts:
Digikey: https://developer.digikey.com/documentation/oauth
Tried with Qt 5.14.2(windows) and 5.12.8(linux)

Logging is activated:

QLoggingCategory::setFilterRules("qt.networkauth.*=true");

Now when I call the function grant():

DigikeyWrapper::DigikeyWrapper(const Settings &settings, QObject *parent)
    : QObject(parent)
    , m_settings(settings) {
    auto replyHandler = new QOAuthHttpServerReplyHandler(1337, this);
    oauth2.setReplyHandler(replyHandler);
    oauth2.setAuthorizationUrl(QUrl(m_settings.get_digikey_url_string() + "/v1/oauth2/authorize"));
    oauth2.setAccessTokenUrl(QUrl(m_settings.get_digikey_url_string() + "/v1/oauth2/token"));
    oauth2.setScope("identity read");
    oauth2.setClientIdentifier(m_settings.get_digikey_clientID());
    oauth2.setClientIdentifierSharedKey(m_settings.get_digikey_secret());

    network_manager = new QNetworkAccessManager(this);
    connect(&oauth2, &QOAuth2AuthorizationCodeFlow::statusChanged, [=](QAbstractOAuth::Status status) {
        qDebug() << "statusChanged";
        if (status == QAbstractOAuth::Status::Granted)
            emit authenticated();
    });
    oauth2.setModifyParametersFunction([&](QAbstractOAuth::Stage stage, QVariantMap *parameters) {
        if (stage == QAbstractOAuth::Stage::RequestingAuthorization && isPermanent())
            parameters->insert("duration", "permanent");
    });
    connect(&oauth2, &QOAuth2AuthorizationCodeFlow::authorizeWithBrowser, &QDesktopServices::openUrl);

    connect(this, &DigikeyWrapper::authenticated, this, &DigikeyWrapper::just_authenticated);
}

void DigikeyWrapper::grant() {
    qDebug() << "granting..";
    oauth2.grant();
}

The browser window opens but is completely empty. Normally I should see a mask to enter my shop credentials.
The console says:

granting..
qt.networkauth.oauth2: Generated URL: https://api.digikey.com/v1/oauth2/authorize?client_id=xxxxxxxx&redirect_uri=http://127.0.0.1:1337/&response_type=code&scope=identity read&state=8E4ntqBX
onecore\com\combase\catalog\catalog.cxx(1026)\combase.dll!00007FF94979A4F6: (caller: 00007FF9497B9472) ReturnHr(1) tid(2500) 80070716 Der angegebene Ressourcenname wurde nicht in der Image-Datei gefunden.
onecore\com\combase\inc\ComCatalogHelpers.hpp(60)\combase.dll!00007FF9497B94F9: (caller: 00007FF9497B7FF8) ReturnHr(2) tid(2500) 80070716 Der angegebene Ressourcenname wurde nicht in der Image-Datei gefunden.

If I try the same interface from a python program everything works as expected. This confirms that Digikey is still working.

Unfortunately I don't get any error message except the combase.dll errors where i don't have any clue what this means. Do you have any idea how to debug that issue?

Thank you for ideas,
Aphot

SGaist

Hi and welcome to devnet,

What about the error message on Linux ?

aphot

Hi,

its been i while i didnt work on the project. The branch I use on linux generates mostly the same log:

granting..

qt.networkauth.oauth2: Generated URL: https://api.digikey.com/v1/oauth2/authorize?client_id=xxx&redirect_uri=http://127.0.0.1:1337/&response_type=code&scope=identity read&state=zNpwF7xT

I also checked the empty page i get from Digikey, where I should see the logingscreen, and also the html souce code is empty.

SGaist

Do you mean the login page is empty ?

aphot

yes, zero bytes

aphot

Ok, I just was trying around and deleted the line setting the scope.
It works this way. Dont know why, but it works. Little funny side fact: The login page is on japanese now, but I can login :-)

SGaist

Authentication is sometime mysterious...