Remove Boilerplate Use-case thingy

domain/src/ExportService.kt

@@ -0,0 +1,60 @@
+package be.simplenotes.domain
+
+import be.simplenotes.persistence.repositories.NoteRepository
+import be.simplenotes.types.ExportedNote
+import kotlinx.serialization.builtins.ListSerializer
+import kotlinx.serialization.json.Json
+import org.apache.commons.compress.archivers.zip.ZipArchiveEntry
+import org.apache.commons.compress.archivers.zip.ZipArchiveOutputStream
+import java.io.ByteArrayInputStream
+import java.io.ByteArrayOutputStream
+import java.io.InputStream
+import javax.inject.Singleton
+
+interface ExportService {
+    fun exportAsJson(userId: Int): String
+    fun exportAsZip(userId: Int): InputStream
+}
+
+@Singleton
+internal class ExportServiceImpl(
+    private val noteRepository: NoteRepository,
+    private val json: Json,
+) : ExportService {
+
+    override fun exportAsJson(userId: Int): String {
+        val notes = noteRepository.export(userId)
+        return json.encodeToString(ListSerializer(ExportedNote.serializer()), notes)
+    }
+
+    private fun sanitizeFilename(inputName: String): String = inputName.replace("[^a-zA-Z0-9-_.]".toRegex(), "_")
+
+    override fun exportAsZip(userId: Int): InputStream {
+        val notes = noteRepository.export(userId)
+        val zipOutput = ZipOutput()
+        zipOutput.use { zip ->
+            notes.forEach {
+                val name = sanitizeFilename(it.title)
+                zip.write("notes/$name.md", it.markdown)
+            }
+        }
+        return ByteArrayInputStream(zipOutput.outputStream.toByteArray())
+    }
+}
+
+private class ZipOutput : AutoCloseable {
+    val outputStream = ByteArrayOutputStream()
+    private val zipOutputStream = ZipArchiveOutputStream(outputStream)
+
+    fun write(path: String, content: String) {
+        val entry = ZipArchiveEntry(path)
+        zipOutputStream.putArchiveEntry(entry)
+        zipOutputStream.write(content.toByteArray())
+        zipOutputStream.closeArchiveEntry()
+    }
+
+    override fun close() {
+        zipOutputStream.finish()
+        zipOutputStream.close()
+    }
+}