@@ -0,0 +1,105 @@
+package com.requestrealpiano.songrequest.security;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.requestrealpiano.songrequest.domain.account.Role;
+import com.requestrealpiano.songrequest.security.filter.JwtAuthorizationFilter;
+import com.requestrealpiano.songrequest.security.jwt.JwtTokenProvider;
+import com.requestrealpiano.songrequest.security.oauth.CustomAccessDeniedHandler;
+import com.requestrealpiano.songrequest.security.oauth.CustomAuthenticationEntryPoint;
+import com.requestrealpiano.songrequest.security.oauth.CustomAuthenticationSuccessHandler;
+import com.requestrealpiano.songrequest.security.oauth.CustomOAuth2UserService;
+import com.requestrealpiano.songrequest.domain.account.AccountRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.boot.autoconfigure.security.servlet.PathRequest;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.HttpMethod;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.builders.WebSecurity;
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
+import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
+import org.springframework.security.config.http.SessionCreationPolicy;
+import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
+import org.springframework.security.web.csrf.CsrfFilter;
+import org.springframework.web.cors.CorsConfiguration;
+import org.springframework.web.cors.CorsConfigurationSource;
+import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
+import org.springframework.web.filter.CharacterEncodingFilter;
+
+import java.util.Arrays;
+import java.util.Collections;
+
+import static org.springframework.security.config.Customizer.withDefaults;
+
+@RequiredArgsConstructor
+@Configuration
+@EnableWebSecurity
+public class SecurityConfig extends WebSecurityConfigurerAdapter {
+
+    private final CustomOAuth2UserService customOAuth2UserService;
+    private final CustomAuthenticationSuccessHandler customAuthenticationSuccessHandler;
+    private final CustomAuthenticationEntryPoint customAuthenticationEntryPoint;
+    private final CustomAccessDeniedHandler customAccessDeniedHandler;
+    private final AccountRepository accountRepository;
+    private final JwtTokenProvider jwtTokenProvider;
+    private final ObjectMapper objectMapper;
+
+    @Override
+    public void configure(WebSecurity web) throws Exception {
+        web.ignoring().requestMatchers(PathRequest.toStaticResources().atCommonLocations());
+
+        web.ignoring().antMatchers(HttpMethod.GET, "/api/accounts/auth")
+                      .antMatchers(HttpMethod.GET, "/api/letters/**")
+        ;
+    }
+
+    @Override
+    protected void configure(HttpSecurity http) throws Exception {
+        http.cors(withDefaults());
+
+        http.csrf().disable()
+            .httpBasic().disable();
+
+        http.authorizeRequests()
+//            .antMatchers("/**").permitAll()
+            .antMatchers("/api/letters").hasAnyRole(Role.MEMBER.getKey(), Role.ADMIN.getKey())
+            .antMatchers("/api/songs").hasAnyRole(Role.MEMBER.getKey(), Role.ADMIN.getKey())
+            .anyRequest().authenticated();
+
+        http.sessionManagement()
+            .sessionCreationPolicy(SessionCreationPolicy.STATELESS);
+
+        http.addFilterBefore(characterEncodingFilter(), CsrfFilter.class)
+            .addFilterBefore(JwtAuthorizationFilter.of(accountRepository, jwtTokenProvider, objectMapper), UsernamePasswordAuthenticationFilter.class);
+
+        http.oauth2Login()
+            .userInfoEndpoint()
+            .userService(customOAuth2UserService)
+                .and()
+            .successHandler(customAuthenticationSuccessHandler);
+
+        http.exceptionHandling()
+            .authenticationEntryPoint(customAuthenticationEntryPoint)
+            .accessDeniedHandler(customAccessDeniedHandler);
+    }
+
+    public CharacterEncodingFilter characterEncodingFilter() {
+        CharacterEncodingFilter encodingFilter = new CharacterEncodingFilter();
+        encodingFilter.setEncoding("UTF-8");
+        encodingFilter.setForceEncoding(true);
+        return encodingFilter;
+    }
+
+    @Bean
+    CorsConfigurationSource corsConfigurationSource() {
+        CorsConfiguration configuration = new CorsConfiguration();
+        configuration.setAllowedOrigins(Collections.singletonList("*"));
+        configuration.setAllowedMethods(Arrays.asList("GET", "POST", "PUT", "PATCH", "DELETE", "OPTIONS"));
+        configuration.setAllowedHeaders(Collections.singletonList("*"));
+        configuration.setExposedHeaders(Collections.singletonList("Authorization"));
+        configuration.setAllowCredentials(true);
+        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
+        source.registerCorsConfiguration("/**", configuration);
+        return source;
+    }
+}

리뷰: `WebConfig`에서도 CORS 에러에 대한 대비책을 설정하셨는데 여기서도 설정한 이유가 궁금합니다.