get portal user in SAPUI5

Hi Gurus,

I have to create a SAPUI5 application in portal. When user clicks that iview,

I need to check whether the portal user assigned to a particular portal group.

If he is assigned, I have to display the application form else need to give a message you are not assigned to this group.

I have developed the SAPUI5 Application form, but struggling to get the logged in user.

How we can get the portal user in SAPUI5 application?

Thanks in Advance,

Ram