how to connect signal for QOAuth2AuthorizationCodeFlow::authorizeWithBrowser?

shokarta

Hello Guys,

I am trying to build QAuth SSO for Facebook Login,
as we all know, Facebook does not allow HTTP redirrect, only HTTPS,
which unfortunatelly standard QOAuth2AuthorizationCodeFlow does not handle.

according to https://forum.qt.io/topic/124560/oauth2-ssl-support/15

it is possible after QOAuth2AuthorizationCodeFlow::authorizeWithBrowser to change the parameter from https to http, so QOAuth2AuthorizationCodeFlow QOAuthHttpServerReplyHandler can pick it up...

so my code is:

FacebookSSO::FacebookSSO(QObject *parent) : QObject(parent) {
    this->facebook = new QOAuth2AuthorizationCodeFlow(this);
	this->facebook->setScope("public_profile,email");
    connect(this->facebook, &QOAuth2AuthorizationCodeFlow::authorizeWithBrowser, &QDesktopServices::openUrl);
	
	
	this->facebook->setAuthorizationUrl("https://facebook.com/dialog/oauth");		// or https://graph.facebook.com/oauth/authorize ?
	this->facebook->setClientIdentifier("<CLIENT_ID>");
	this->facebook->setAccessTokenUrl("https://graph.facebook.com/oauth/access_token");
	this->facebook->setClientIdentifierSharedKey("<CLIENT_SECRET>");
	QUrl redirectUri("https://127.0.0.1:5746/");			// so I set here HTTPS to generate proper url so its not rejected by Facebook API
	
	
	this->facebook->setModifyParametersFunction([redirectUri](QAbstractOAuth::Stage stage, QMultiMap<QString, QVariant>* parameters) {
//qDebug() << "modifyParametersFunction stage=" << static_cast<int>(stage);		// debugs only "1", because once when the reply message is redirected to HTTPS, then QOAuth2AuthorizationCodeFlow can not pick it up and dies there
		if (stage == QAbstractOAuth::Stage::RequestingAuthorization)
		{
			parameters->replace("redirect_uri", redirectUri);		// here I must override the generated url for my Uri, to be exactly as I want, as its not modifiable in easy way
		}
	});
	
	QOAuthHttpServerReplyHandler* replyHandler = new QOAuthHttpServerReplyHandler(5746, this);
	replyHandler->setCallbackText("<b>Reply received<b>, close the window, or perhaps automaticaly via JS window.close() ?");
	this->facebook->setReplyHandler(replyHandler);
	
	connect(this->facebook, &QOAuth2AuthorizationCodeFlow::granted, [=](){
//qDebug() << __FUNCTION__ << __LINE__ << "Access Granted!";	// does not get here
	});
}

therefore, my only a Simple question os, how to connect to the:

QOAuth2AuthorizationCodeFlow::authorizeWithBrowser

so once this happens, I can move and do this again:

parameters->replace("redirect_uri", redirectUri); // this time I put only HTTP there

Thank you gurus!

Paul Colby

Hi @shokarta

QDesktopServices::openUrl() is not a slot. So simply wrap it in your own slot. eg

class FacebookSSO : ...
{
...
public slots:
    void openUrl(const QUrl &url);
}

FacebookSSO::FacebookSSO(QObject *parent) : QObject(parent) {
    ...
    connect(this->facebook, &QOAuth2AuthorizationCodeFlow::authorizeWithBrowser,
            this, &FacebookSSO::openUrl);
    ...
}

void FacebookSSO::openUrl(const QUrl &url) {
    if (!QDesktopServices::openUrl(const QUrl &url)) {
        // handle error.
    }
}

Cheers.