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src/main/java/de/w665/testing/controller/WebSocketInviteController.java

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+package de.w665.testing.controller;
+
+import de.w665.testing.dto.AcceptInviteCommand;
+import de.w665.testing.dto.DeclineInviteCommand;
+import de.w665.testing.dto.InviteCommand;
+import de.w665.testing.service.InviteService;
+import org.springframework.messaging.handler.annotation.MessageMapping;
+import org.springframework.messaging.handler.annotation.Payload;
+import org.springframework.stereotype.Controller;
+
+import java.security.Principal;
+
+@Controller
+public class WebSocketInviteController {
+    private final InviteService inviteService;
+
+    public WebSocketInviteController(InviteService inviteService) {
+        this.inviteService = inviteService;
+    }
+
+    @MessageMapping("/invite/send")
+    public void sendInvite(@Payload InviteCommand cmd, Principal principal) {
+        if (principal == null) return;
+        String from = principal.getName();
+        if (cmd.getTo() == null || cmd.getTo().isBlank()) return;
+        if (from.equalsIgnoreCase(cmd.getTo())) return;
+        inviteService.sendInvite(from, cmd.getTo().trim().toLowerCase());
+    }
+
+    @MessageMapping("/invite/accept")
+    public void acceptInvite(@Payload AcceptInviteCommand cmd, Principal principal) {
+        if (principal == null) return;
+        String recipient = principal.getName();
+        if (cmd.getInviter() == null || cmd.getInviter().isBlank()) return;
+        inviteService.acceptInvite(recipient, cmd.getInviter().trim().toLowerCase());
+    }
+
+    @MessageMapping("/invite/decline")
+    public void declineInvite(@Payload DeclineInviteCommand cmd, Principal principal) {
+        if (principal == null) return;
+        String recipient = principal.getName();
+        if (cmd.getInviter() == null || cmd.getInviter().isBlank()) return;
+        inviteService.declineInvite(recipient, cmd.getInviter().trim().toLowerCase());
+    }
+}