allow iframe login

[plessbd]

detect if login is within an iframe and do no redirect to the portal, instead send a postMessage to allow the parent frame to do what it wants

something like this should work

window.addEventListener("message", receiveMessage, false);

function receiveMessage(event) {
  if (event.origin !== "{FQDN OF XDMOD INSTANCE WITH PROTOCOL AND PORT IF NEEDED}"){
    console.log('Received message from untrusted origin, discarding');
    return;
  }
  if(event.data.application == 'xdmod'){
    if(event.data.message == 'loginComplete'){
      console.log('XDMoD has logged in successfully');
    }
	if(event.data.message == 'error'){
      console.log('ERROR: ' + event.data.info);
    }
  }
}

DO NOT MERGE RELATED TO #1193

[sonarcloud]

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