Refactor index.html loading

src/main/kotlin/com/pischule/memevizor/upload/IndexInitializer.kt

@@ -2,6 +2,7 @@ package com.pischule.memevizor.upload
 
 import io.github.oshai.kotlinlogging.KotlinLogging
 import org.springframework.boot.context.event.ApplicationStartedEvent
+import org.springframework.context.ApplicationContext
 import org.springframework.context.annotation.Configuration
 import org.springframework.context.event.EventListener
 import org.springframework.scheduling.annotation.Async
@@ -9,22 +10,19 @@ import org.springframework.scheduling.annotation.Async
 private val logger = KotlinLogging.logger {}
 
 @Configuration
-class IndexInitializer(val fileUploaderService: FileUploaderService) {
+class IndexInitializer(val fileUploaderService: FileUploaderService, val ctx: ApplicationContext) {
 
     @Async
-    @EventListener
-    fun applicationStartedHandler(event: ApplicationStartedEvent) {
+    @EventListener(ApplicationStartedEvent::class)
+    fun applicationStartedHandler() {
         try {
-            val fileBytes = readResourceAsByteArray("static/index.html")
+            val fileBytes = getIndexHtmlBytes()
             fileUploaderService.uploadFile(fileBytes, "index.html", "text/html")
         } catch (e: Exception) {
             logger.warn(e) { "Failed to upload " }
         }
     }
 
-    private fun readResourceAsByteArray(resourcePath: String): ByteArray {
-        val inputStream =
-            ClassLoader.getSystemResourceAsStream(resourcePath) ?: error("$resourcePath not found")
-        return inputStream.use { it.readAllBytes() }
-    }
+    private fun getIndexHtmlBytes(): ByteArray =
+        ctx.getResource("classpath:static/index.html").inputStream.use { it.readAllBytes() }
 }