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Getting the current user

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Original file line number	Diff line number	Diff line change
`@@ -1,10 +1,16 @@`
`1`	`1`	`package com.naturalprogrammer.spring5tutorial.utils;`
`2`	`2`
	`3`	`+import java.util.Optional;`
	`4`	`+`
`3`	`5`	`import org.springframework.context.MessageSource;`
`4`	`6`	`import org.springframework.context.i18n.LocaleContextHolder;`
	`7`	`+import org.springframework.security.core.Authentication;`
	`8`	`+import org.springframework.security.core.context.SecurityContextHolder;`
`5`	`9`	`import org.springframework.stereotype.Component;`
`6`	`10`	`import org.springframework.web.servlet.mvc.support.RedirectAttributes;`
`7`	`11`
	`12`	`+import com.naturalprogrammer.spring5tutorial.domain.User;`
	`13`	`+`
`8`	`14`	`@Component`
`9`	`15`	`public class MyUtils {`
`10`	`16`
`@@ -28,4 +34,20 @@ public static void flash(RedirectAttributes redirectAttributes,`
`28`	`34`
`29`	`35`	`redirectAttributes.addFlashAttribute("flashKind", flashKind);`
`30`	`36`	`}`
	`37`	`+`
	`38`	`+ public static Optional<User> currentUser() {`
	`39`	`+`
	`40`	`+ Authentication auth = SecurityContextHolder`
	`41`	`+ .getContext().getAuthentication();`
	`42`	`+`
	`43`	`+ if (auth != null) {`
	`44`	`+`
	`45`	`+ Object principal = auth.getPrincipal();`
	`46`	`+`
	`47`	`+ if (principal instanceof User)`
	`48`	`+ return Optional.of((User) principal);`
	`49`	`+ }`
	`50`	`+`
	`51`	`+ return Optional.empty();`
	`52`	`+ }`
`31`	`53`	`}`

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