add SecurityConfiguration

src/main/kotlin/ltd/hlaeja/configuration/SecurityConfiguration.kt

@@ -0,0 +1,29 @@
+package ltd.hlaeja.configuration
+
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+import org.springframework.security.config.annotation.web.reactive.EnableWebFluxSecurity
+import org.springframework.security.config.web.server.ServerHttpSecurity
+import org.springframework.security.config.web.server.ServerHttpSecurity.AuthorizeExchangeSpec
+import org.springframework.security.web.server.SecurityWebFilterChain
+
+@Configuration
+@EnableWebFluxSecurity
+class SecurityConfiguration {
+
+    @Bean
+    fun securityWebFilterChain(serverHttpSecurity: ServerHttpSecurity): SecurityWebFilterChain = serverHttpSecurity
+        .authorizeExchange(::authorizeExchange)
+        .build()
+
+    private fun authorizeExchange(authorizeExchange: AuthorizeExchangeSpec) = authorizeExchange
+        .publicPaths().permitAll()
+        .anyExchange().authenticated()
+
+    private fun AuthorizeExchangeSpec.publicPaths(): AuthorizeExchangeSpec.Access = pathMatchers(
+        "/css/**",
+        "/js/**",
+        "/img/**",
+        "/actuator/**",
+    )
+}