feat: 이메일 기반 로그인 정책 기능 추가

server/api/src/main/java/vook/server/api/config/SecurityConfig.java

@@ -15,8 +15,11 @@
 import org.springframework.security.oauth2.client.web.OAuth2AuthorizationRequestResolver;
 import org.springframework.security.oauth2.client.web.OAuth2LoginAuthenticationFilter;
 import org.springframework.security.web.SecurityFilterChain;
+import org.springframework.security.web.firewall.HttpStatusRequestRejectedHandler;
+import org.springframework.security.web.firewall.RequestRejectedHandler;
 import vook.server.api.web.common.auth.app.TokenService;
 import vook.server.api.web.common.auth.jwt.JWTFilter;
+import vook.server.api.web.common.auth.oauth2.LoginPolicyChecker;
 import vook.server.api.web.common.auth.oauth2.LoginSuccessHandler;
 import vook.server.api.web.common.auth.oauth2.VookOAuth2UserService;
 
@@ -94,4 +97,16 @@ private static OAuth2AuthorizationRequestResolver authorizationRequestResolver(C
                 }));
         return authorizationRequestResolver;
     }
+
+    @Bean
+    public RequestRejectedHandler requestRejectedHandler() {
+        HttpStatusRequestRejectedHandler defaultHandler = new HttpStatusRequestRejectedHandler();
+        return (request, response, requestRejectedException) -> {
+            if (requestRejectedException instanceof LoginPolicyChecker.VookRequestRejectedException) {
+                response.sendRedirect(loginFailUrl);
+            } else {
+                defaultHandler.handle(request, response, requestRejectedException);
+            }
+        };
+    }
 }

server/api/src/main/java/vook/server/api/web/common/auth/oauth2/LoginPolicyChecker.java

@@ -0,0 +1,48 @@
+package vook.server.api.web.common.auth.oauth2;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.security.web.firewall.RequestRejectedException;
+import org.springframework.stereotype.Component;
+
+@Component
+public class LoginPolicyChecker {
+
+    private final Boolean loginRestrictionEnable;
+    private final String[] allowedEmails;
+
+    public LoginPolicyChecker(
+            @Value("${service.loginPolicy.loginRestriction.enable:false}")
+            Boolean loginRestrictionEnable,
+            @Value("${service.loginPolicy.loginRestriction.allowedEmails:}")
+            String[] allowedEmails
+    ) {
+        this.loginRestrictionEnable = loginRestrictionEnable;
+        this.allowedEmails = allowedEmails;
+    }
+
+    public void check(OAuth2Response response) {
+        if (!loginRestrictionEnable) {
+            return;
+        }
+
+        // allowedEmails가 비어 있으면 모든 이메일을 허용
+        if (allowedEmails.length != 0 && !isAllowedEmail(response)) {
+            throw new VookRequestRejectedException("Not allowed email: " + response.getEmail());
+        }
+    }
+
+    private boolean isAllowedEmail(OAuth2Response response) {
+        for (String allowedEmail : this.allowedEmails) {
+            if (response.getEmail().equals(allowedEmail)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public static class VookRequestRejectedException extends RequestRejectedException {
+        public VookRequestRejectedException(String message) {
+            super(message);
+        }
+    }
+}

server/api/src/main/java/vook/server/api/web/common/auth/oauth2/VookOAuth2UserService.java

@@ -20,6 +20,7 @@
 public class VookOAuth2UserService extends DefaultOAuth2UserService {
 
     private final UserLogic userLogic;
+    private final LoginPolicyChecker loginPolicyChecker;
 
     @Override
     public OAuth2User loadUser(OAuth2UserRequest userRequest) throws OAuth2AuthenticationException {
@@ -33,6 +34,8 @@ public OAuth2User loadUser(OAuth2UserRequest userRequest) throws OAuth2Authentic
             return null;
         }
 
+        loginPolicyChecker.check(oAuth2Response);
+
         return userLogic.findByProvider(oAuth2Response.getProvider(), oAuth2Response.getProviderId())
                 .map(VookLoginUser::from)
                 .orElseGet(() -> signUpUser(oAuth2Response));

server/api/src/main/java/vook/server/api/web/common/response/GlobalControllerAdvice.java

@@ -0,0 +1,20 @@
+package vook.server.api.web.common.response;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+
+@Slf4j
+@ControllerAdvice
+public class GlobalControllerAdvice {
+
+    @Value("${service.oauth2.loginFailUrl}")
+    private String loginFailUrl;
+
+    @ExceptionHandler(Exception.class)
+    public String handleException(Exception e) {
+        log.error(e.getMessage(), e);
+        return "redirect:" + loginFailUrl;
+    }
+}

server/api/src/main/resources/application-local.yml

@@ -39,5 +39,9 @@ service:
     loginFailUrl: http://localhost:3000/auth?error
     accessTokenExpiredMinute: 30 # 30 minutes
     refreshTokenExpiredMinute: 10080 # 60 * 24 * 7 == 1 week
+  loginPolicy:
+    loginRestriction:
+      enable: false
+      allowedEmails: ""
 logging:
   config: classpath:logback.xml