QWebKit Setting Up User Agent

anshah

My application uses QWebKit on Ubuntu Linux. I need to setup a User Agent with a prefix and then add an emulated browser agent string.

I figured out how to setup the User Agent by overloading QWebPage::userAgentForUrl. I have the User Agent prefix setup already but now I want to add the emulated browser agent string to this prefix.

I found that in MAC using WebKit::WebView the emulated browser agent is setup by the following:

WebView myWebView;
...
NSString *uagnt = [myWebView stringByEvaluatingJavaScriptFromString:@"navigator.userAgent"];

I know the QWebKit uses WebKit as a backend so this must be possible in Qt WebKit. How can I go about doing this in QWebView / QWebPage?

SGaist

Hi,

From the looks of it, you can create a QWebPage subclass and re-implement QWebPage::userAgentForUrl.

Hope it helps

anshah

@sgaist Thanks for the reply! I have already created a subclass and reimplemented QWebPage::userAgentForUrl so I got that part covered.

The main question I had was what is the Qt equivalent of:

WebView:stringByEvaluatingJavaScriptFromString

In Qt is there a way I can extract the "navigator.userAgent" JavaScript as seen in this code example using WebView on MAC:

WebView myWebView;
...
NSString *uagnt = [myWebView stringByEvaluatingJavaScriptFromString:@"navigator.userAgent"];

SGaist

I may have misunderstood your problem.

Can you detail a bit more what you want to do with that information and where you would like to extract it ?

anshah

@sgaist Sorry I should have been more clear to begin with. Basically all I want to do is extract the following string in QtWebKit by evaluating JavaScript:

navigator.userAgent

I want to set up our user agent with a predefined prefix plus the JavaScript evaluated "navigator.userAgent".

So I have already subclassed QWebPage::userAgentForUrl and have the prefix set. Now the last piece of the puzzle is adding "navigator.userAgent" by evaluating JavaScript.

I need to do this for SAML authentication testing.

As I illustrated before in MAC this is done by:

WebView myWebView;
...
NSString *uagnt = [myWebView stringByEvaluatingJavaScriptFromString:@"navigator.userAgent"];

How can I achieve this in QtWebKit? Do I achieve this using QWebView, QWebPage, or QWebFrame?

Hope I was clearer this time around.

Konstantin Tokarev

Evaluating navigator.userAgent returns whatever string is returned by QWebPage::userAgentForUrl. If you want to evaluate arbitrary JS expressions, use QWebFrame::evaluateJavaScript

anshah

@konstantin-tokarev
@SGaist
Is there a way to get the parent's userAgentForUrl value? Such as below?

// User Agent Web Page
class UserAgentWebPage : public QWebPage
{
    QString userAgentForUrl(const QUrl &url) const
    {
        // UserAgent: Prefix
        QString userAgent = QWebPage::userAgentForUrl();

        // Modify userAgent with custom prefixes

        return userAgent;
    }
};

My objective is to first obtain QtWebKit's User-Agent and then prefix that with my own custom fields.

So let me summarize my questions:

How do I obtain the default browser User-Agent string using QtWebKit?
How can I call QWebPage::userAgentForUrl() from it's child?

Any help would be most appreciated guys as I'm at a roadblock at the moment.

Konstantin Tokarev

Is there a way to get the parent's userAgentForUrl value? Such as below?

Yes it's possible

Konstantin Tokarev

However it might be enough for your purposes to set application name and version on your QApplication, this information will be displayed in UA string

Unsolved QWebKit Setting Up User Agent