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Get currently logged user from apex


I need to take programmatically the currently logged user via apex source code to change the permissions of that user.
Here is my code:
public with sharing class UnlockRecordDuringApprovalController {
Opportunity objOpportunity;
public UnlockRecordDuringApprovalController(ApexPages.StandardController controller) { 
objOpportunity = (Opportunity)controller.getRecord(); 
public void processRecord() {

Please advise or give example(s) how this can be achieved in Salesforce?
Thank you