Authorization

- add SecurityConfiguration
- add JwtAuthenticationManager
- add JwtAuthenticationConverter
- add JwtAuthenticationToken
- add JwtUserDetails

src/main/kotlin/ltd/hlaeja/security/JwtAuthenticationManager.kt

@@ -0,0 +1,27 @@
+package ltd.hlaeja.security
+
+import org.springframework.security.authentication.ReactiveAuthenticationManager
+import org.springframework.security.core.Authentication
+import org.springframework.security.core.AuthenticationException
+import org.springframework.stereotype.Component
+import reactor.core.publisher.Mono
+
+@Component
+class JwtAuthenticationManager : ReactiveAuthenticationManager {
+
+    override fun authenticate(
+        authentication: Authentication,
+    ): Mono<Authentication> = if (authentication is JwtAuthenticationToken) {
+        handleJwtToken(authentication)
+    } else {
+        Mono.error(object : AuthenticationException("Unsupported authentication type") {})
+    }
+
+    private fun handleJwtToken(
+        token: JwtAuthenticationToken,
+    ): Mono<Authentication> = if (token.isAuthenticated) {
+        Mono.just(token)
+    } else {
+        Mono.error(object : AuthenticationException("Invalid or expired JWT token") {})
+    }
+}