fix: Support CP condition for context configuration on JRE 8 (#36)

fix - Support conditional on class on jre 8

Author: lorenzsimon

kotlin-asyncapi-spring-web/src/main/kotlin/org/openfolder/kotlinasyncapi/springweb/AsyncApiAutoConfiguration.kt

@@ -1,19 +1,26 @@
 package org.openfolder.kotlinasyncapi.springweb
 
+import org.openfolder.kotlinasyncapi.model.AsyncApi
 import org.openfolder.kotlinasyncapi.springweb.context.DefaultInfoProvider
+import org.openfolder.kotlinasyncapi.springweb.context.DefaultResourceProvider
+import org.openfolder.kotlinasyncapi.springweb.context.ResourceProvider
 import org.openfolder.kotlinasyncapi.springweb.controller.AsyncApiController
 import org.openfolder.kotlinasyncapi.springweb.service.AsyncApiExtension
 import org.openfolder.kotlinasyncapi.springweb.service.AsyncApiSerializer
 import org.openfolder.kotlinasyncapi.springweb.service.AsyncApiService
 import org.openfolder.kotlinasyncapi.springweb.service.DefaultAsyncApiSerializer
 import org.openfolder.kotlinasyncapi.springweb.service.DefaultAsyncApiService
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty
 import org.springframework.boot.context.properties.ConfigurationProperties
 import org.springframework.context.ApplicationContext
 import org.springframework.context.annotation.Bean
 import org.springframework.context.annotation.Configuration
 import org.springframework.context.annotation.Import
+import kotlin.script.experimental.host.toScriptSource
+import kotlin.script.experimental.jvmhost.BasicJvmScriptingHost
 
 @Configuration
 @ConditionalOnBean(AsyncApiMarkerConfiguration.Marker::class)
@@ -57,3 +64,43 @@ internal open class AsyncApiAutoConfiguration {
     open fun asyncApiController(service: AsyncApiService, serializer: AsyncApiSerializer): AsyncApiController =
         AsyncApiController(service, serializer)
 }
+
+@Configuration
+@ConditionalOnProperty(name = ["asyncapi.script.enabled"], havingValue = "true", matchIfMissing = true)
+@Import(AsyncApiEmbeddedScriptAutoConfiguration::class)
+internal open class AsyncApiScriptAutoConfiguration {
+
+    @Bean
+    open fun resourceProvider(context: ApplicationContext) =
+        DefaultResourceProvider(context)
+
+    @Bean
+    open fun asyncApiResourceExtension(resourceProvider: ResourceProvider, asyncApiProperties: AsyncApiProperties) =
+        resourceProvider.resource(asyncApiProperties.script.resourcePath, AsyncApi::class)?.let {
+            AsyncApiExtension.from(resource = it)
+        }
+}
+
+@Configuration
+@ConditionalOnClass(BasicJvmScriptingHost::class)
+internal open class AsyncApiEmbeddedScriptAutoConfiguration {
+
+    @Bean
+    open fun asyncApiScriptExtension(resourceProvider: ResourceProvider, asyncApiProperties: AsyncApiProperties) =
+        resourceProvider.resource(asyncApiProperties.script.sourcePath)?.let {
+            AsyncApiExtension.from(
+                script = it.inputStream.bufferedReader().use { it.readText() }.toScriptSource()
+            )
+        }
+}
+
+@Configuration
+internal open class AsyncApiMarkerConfiguration {
+
+    @Bean
+    open fun asyncApiMarkerBean(): Marker {
+        return Marker()
+    }
+
+    class Marker
+}