improvements in ktor client-server files handling

ktor/common/src/jvmMain/kotlin/dev/inmo/micro_utils/ktor/common/CreateTempFileFromInput.kt

@@ -0,0 +1,23 @@
+package dev.inmo.micro_utils.ktor.common
+
+import io.ktor.utils.io.core.Input
+import io.ktor.utils.io.core.copyTo
+import io.ktor.utils.io.streams.asOutput
+import java.io.File
+import java.io.InputStream
+import java.util.UUID
+
+fun Input.downloadToTempFile(
+    fileName: String = UUID.randomUUID().toString(),
+    fileExtension: String? = ".temp",
+    folder: File? = null
+) = File.createTempFile(
+    fileName,
+    fileExtension,
+    folder
+).apply {
+    outputStream().use {
+        copyTo(it.asOutput())
+    }
+    deleteOnExit()
+}