add security configuration

src/main/kotlin/com/auth/config/WebSecurityConfig.kt

@@ -0,0 +1,35 @@
+package com.auth.config
+
+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.LogoutConfigurer
+import org.springframework.security.config.annotation.web.configurers.oauth2.client.OAuth2LoginConfigurer
+import org.springframework.security.web.SecurityFilterChain
+
+
+@Configuration
+@EnableWebSecurity
+class WebSecurityConfig () {
+
+    @Bean
+    @Throws(Exception::class)
+    fun filterChain(http: HttpSecurity): SecurityFilterChain? {
+        http
+            .authorizeHttpRequests(Customizer { auth -> auth
+                .requestMatchers("/", "/home").permitAll()
+                .anyRequest().authenticated()
+            })
+            .oauth2Login(Customizer { oauth2: OAuth2LoginConfigurer<HttpSecurity?>? ->
+                oauth2!!
+                    .defaultSuccessUrl("/dashboard", true)
+                    .loginPage("/oauth2/authorization/keycloak") } // Spring сам редиректит
+            ).logout(Customizer { logout: LogoutConfigurer<HttpSecurity?>? ->
+                logout!!
+                    .logoutSuccessUrl("/") })
+
+        return http.build()
+    }
+}