added token management

src/main/java/net/geant/nmaas/portal/api/security/CustomAccessTokenController.java

+package net.geant.nmaas.portal.api.security;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.log4j.Log4j2;
+import net.geant.nmaas.portal.exceptions.ObjectNotFoundException;
+import net.geant.nmaas.portal.persistent.entity.AccessToken;
+import net.geant.nmaas.portal.persistent.entity.User;
+import net.geant.nmaas.portal.service.CustomAccessTokenService;
+import net.geant.nmaas.portal.service.UserService;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.security.Principal;
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/tokens")
+@RequiredArgsConstructor
+@Log4j2
+public class CustomAccessTokenController {
+
+    private final CustomAccessTokenService accessTokenService;
+    private final UserService userService;
+
+    @GetMapping()
+    public List<AccessToken> getAll(Principal principal) {
+        User user = getUser(principal);
+        return accessTokenService.getAll(user.getId());
+    }
+
+    @PostMapping()
+    public AccessToken createNewToken(Principal principal, @RequestBody String name) {
+        User user = getUser(principal);
+        return accessTokenService.createToken(user.getId(), name);
+    }
+
+    @PutMapping("/{id}")
+    public void invalidateToken(@PathVariable Long id) {
+        accessTokenService.invalidate(id);
+    }
+
+    private User getUser(Principal principal) {
+        String principalName = principal.getName();
+        return userService.findByUsername(principalName)
+                .orElseThrow(() -> new ObjectNotFoundException("User not found"));
+    }
+}