Qt should detect username and password from OsX keychain if the proxy requires it

When proxy requires authentication then Qt should try to get the username and password from OsX keychain. Something like this:

int getProxyAuth(const QString& url,QString& username, QString& password)
{
OSStatus err;
SecKeychainItemRef itemRef;

err = SecKeychainFindInternetPassword(NULL,
url.length(), qPrintable(url),
0,NULL,
0, NULL,
0, NULL,
0,
kSecProtocolTypeAny,
kSecAuthenticationTypeAny,
0, NULL,
&itemRef);
if (err == noErr) {

SecKeychainAttribute attr;
SecKeychainAttributeList attrList;
UInt32 length;
void *outData;

attr.tag = kSecAccountItemAttr;
attr.length = 0;
attr.data = NULL;

attrList.count = 1;
attrList.attr = &attr;

if (SecKeychainItemCopyContent(itemRef, NULL, &attrList, &length, &outData) == noErr) {
CFStringRef usernameosx = CFStringCreateWithBytes(kCFAllocatorDefault, (const UInt8*)attr.data, attr.length, kCFStringEncodingUTF8, false);
CFStringRef passwordosx = CFStringCreateWithBytes(kCFAllocatorDefault, (const UInt8*)outData, length, kCFStringEncodingUTF8, false);
username = QString(CFStringGetCStringPtr(usernameosx, kCFStringEncodingMacRoman));
password = QString(CFStringGetCStringPtr(passwordosx, kCFStringEncodingMacRoman));
CFRelease(usernameosx);
CFRelease(passwordosx);
}
CFRelease(itemRef);
return 0;
}
return -1;
}

void MainWindow::proxyAuthenticationRequired ( const QNetworkProxy & proxy, QAuthenticator * authenticator ) {
QString username;
QString password;
if( getProxyAuth(proxy.hostName(),username,password) == 0 ) {
authenticator->setUser(username);
authenticator->setPassword(password);
}
}