feat : UserId 커스텀 어노테이션 및 Resolver구현 - #10

cakey-api/src/main/java/com/cakey/common/resolver/user/UserId.java

@@ -0,0 +1,11 @@
+package com.cakey.common.resolver.user;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target(ElementType.PARAMETER)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface UserId {
+}

cakey-api/src/main/java/com/cakey/common/resolver/user/UserIdResolver.java

@@ -0,0 +1,28 @@
+package com.cakey.common.resolver.user;
+
+import org.springframework.core.MethodParameter;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.stereotype.Component;
+import org.springframework.web.bind.support.WebDataBinderFactory;
+import org.springframework.web.context.request.NativeWebRequest;
+import org.springframework.web.method.support.HandlerMethodArgumentResolver;
+import org.springframework.web.method.support.ModelAndViewContainer;
+
+@Component
+public class UserIdResolver implements HandlerMethodArgumentResolver {
+
+    @Override
+    public boolean supportsParameter(MethodParameter parameter) {
+        return parameter.getParameterType().equals(Long.class)
+                && parameter.hasParameterAnnotation(UserId.class);
+
+    }
+
+    @Override
+    public Object resolveArgument(MethodParameter parameter,
+                                  ModelAndViewContainer mavContainer,
+                                  NativeWebRequest webRequest,
+                                  WebDataBinderFactory binderFactory) {
+        return SecurityContextHolder.getContext().getAuthentication().getPrincipal();
+    }
+}