Revert "fix: Remove kafka"

This reverts commit 0082305a5a.

module-server/server.gradle.kts

@@ -10,4 +10,5 @@ dependencies {
     annotationProcessor(libs.mapstruct.processor)
     kapt(libs.mapstruct.processor)
     implementation(libs.spring.cloud.starter.config)
+    implementation(libs.spring.cloud.starter.bus.kafka)
 }

module-server/src/main/kotlin/de/twomartens/wahlrecht/security/SpringPolicyEnforcerFilter.kt

@@ -12,18 +12,15 @@ import org.keycloak.adapters.authorization.spi.ConfigurationResolver
 import org.keycloak.adapters.authorization.spi.HttpRequest
 import org.keycloak.representations.adapters.config.PolicyEnforcerConfig
 import java.io.IOException
-import java.util.concurrent.ConcurrentHashMap
 
 
 class SpringPolicyEnforcerFilter(private val configResolver: ConfigurationResolver) : Filter {
-    private val policyEnforcer: MutableMap<PolicyEnforcerConfig, SpringPolicyEnforcer> = ConcurrentHashMap()
-
     @Throws(IOException::class, ServletException::class)
     override fun doFilter(servletRequest: ServletRequest, servletResponse: ServletResponse?, filterChain: FilterChain) {
         val request = servletRequest as HttpServletRequest
         val response = servletResponse as HttpServletResponse?
         val httpRequest = ServletHttpRequest(request) { extractBearerToken(request) }
-        val policyEnforcer = getOrCreatePolicyEnforcer(httpRequest)
+        val policyEnforcer = createPolicyEnforcer(httpRequest)
         val authzContext = policyEnforcer.enforce(httpRequest, ServletHttpResponse(response))
         request.setAttribute(AuthorizationContext::class.java.name, authzContext)
         if (authzContext.isGranted) {
@@ -53,8 +50,8 @@ class SpringPolicyEnforcerFilter(private val configResolver: ConfigurationResolv
         return null
     }
 
-    private fun getOrCreatePolicyEnforcer(request: HttpRequest): SpringPolicyEnforcer {
+    private fun createPolicyEnforcer(request: HttpRequest): SpringPolicyEnforcer {
-        return policyEnforcer.computeIfAbsent(configResolver.resolve(request)) { createPolicyEnforcer(it) }
+        return createPolicyEnforcer(configResolver.resolve(request))
     }
 
     private fun createPolicyEnforcer(enforcerConfig: PolicyEnforcerConfig): SpringPolicyEnforcer {

module-server/src/main/resources/application-prod.yaml

@@ -2,3 +2,6 @@ spring:
   config:
     import:
       - "configserver:${CONFIGSERVER_SCHEME:http}://${CONFIGSERVER_HOST:configserver}:${CONFIGSERVER_PORT:8888}${CONFIGSERVER_PREFIX:/config}"
+  kafka:
+    bootstrap-servers:
+      - "${KAFKA_HOST:kafka}:${KAFKA_PORT:9092}"