add PermissionCheck

wrapper/discord4j/src/main/java/net/tomatentum/marinara/wrapper/discord4j/checks/PermissionCheck.java

@@ -0,0 +1,42 @@
+package net.tomatentum.marinara.wrapper.discord4j.checks;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+import java.util.Optional;
+
+import discord4j.core.event.domain.interaction.InteractionCreateEvent;
+import discord4j.core.object.entity.Member;
+import discord4j.rest.util.Permission;
+import discord4j.rest.util.PermissionSet;
+import net.tomatentum.marinara.checks.InteractionCheck;
+
+public class PermissionCheck implements InteractionCheck<PermissionCheck.HasPermission> {
+
+    @Retention(RetentionPolicy.RUNTIME)
+    @Target(ElementType.METHOD)
+    public static @interface HasPermission {
+        public Permission[] value();
+    }
+
+    @Override
+    public boolean preExec(Object context, HasPermission annotation) {
+        throw new UnsupportedOperationException("Unimplemented method 'preExec'");
+    }
+
+    public boolean preExec(InteractionCreateEvent context, HasPermission annotation) {
+        Optional<Member> member = context.getInteraction().getMember();
+        if (member.isEmpty())
+            return false;
+        PermissionSet ownPerms = PermissionSet.of(annotation.value());
+        PermissionSet permSet = member.get().getBasePermissions().block();
+        return permSet.containsAll(ownPerms);
+    }
+
+    @Override
+    public void postExec(Object context, HasPermission annotation) {
+        
+    }
+    
+}