first implementation

backend/src/main/java/com/aiteacher/config/SecurityConfig.java

@@ -0,0 +1,39 @@
+package com.aiteacher.config;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.config.Customizer;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
+import org.springframework.security.config.annotation.web.configurers.AbstractHttpConfigurer;
+import org.springframework.security.core.userdetails.User;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.security.provisioning.InMemoryUserDetailsManager;
+import org.springframework.security.web.SecurityFilterChain;
+
+@Configuration
+@EnableWebSecurity
+public class SecurityConfig {
+
+    @Bean
+    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
+        http
+            .authorizeHttpRequests(auth -> auth.anyRequest().authenticated())
+            .httpBasic(Customizer.withDefaults())
+            .csrf(AbstractHttpConfigurer::disable);
+        return http.build();
+    }
+
+    @Bean
+    public UserDetailsService userDetailsService(
+            @Value("${app.auth.password}") String password) {
+        UserDetails user = User.builder()
+            .username("neurosurgeon")
+            .password("{noop}" + password)
+            .roles("USER")
+            .build();
+        return new InMemoryUserDetailsManager(user);
+    }
+}