handles zips in zip correctly

src/lib/zip-processing.ts

@@ -56,6 +56,8 @@ const isPdf = (path: string) => getExtension(path) === ".pdf";
 
 const isImage = (path: string) => IMAGE_EXTENSIONS.has(getExtension(path));
 
+const isZipArchive = (path: string) => getExtension(path) === ".zip";
+
 const normalizeKey = (value: string) => value.replaceAll("\\", "/").toLowerCase().trim();
 
 const isMacMetadataEntry = (path: string) => {
@@ -188,11 +190,10 @@ const orderAttachmentsByDocumentNames = (attachments: ZipAttachment[], documentN
 	return orderedAttachments;
 };
 
-export const extractZipArchive = async (file: File): Promise<ProcessedZipArchive> => {
-	const archiveBytes = new Uint8Array(await file.arrayBuffer());
+const extractZipEntries = async (archiveBytes: Uint8Array, fallbackName: string): Promise<ProcessedZipArchive[]> => {
 	const files = await unzipArchive(archiveBytes);
-
 	const attachments: ZipAttachment[] = [];
+	const nestedArchives: ProcessedZipArchive[] = [];
 	let xjustizNachrichtXml: Uint8Array | null = null;
 
 	for (const [path, data] of Object.entries(files)) {
@@ -207,6 +208,12 @@ export const extractZipArchive = async (file: File): Promise<ProcessedZipArchive
 			continue;
 		}
 
+		if (isZipArchive(path)) {
+			const childArchives = await extractZipEntries(data, baseName);
+			nestedArchives.push(...childArchives);
+			continue;
+		}
+
 		if (isPdf(path)) {
 			attachments.push({
 				name: baseName,
@@ -229,10 +236,21 @@ export const extractZipArchive = async (file: File): Promise<ProcessedZipArchive
 
 	const documentNames = xjustizNachrichtXml ? getXJustizDocumentNames(xjustizNachrichtXml) : [];
 	const orderedAttachments = orderAttachmentsByDocumentNames(attachments, documentNames);
-	const archiveName = documentNames[0] ? getBaseName(documentNames[0]) : file.name;
+	const archiveName = documentNames[0] ? getBaseName(documentNames[0]) : fallbackName;
+	const archives: ProcessedZipArchive[] = [];
 
-	return {
-		name: archiveName,
-		attachments: orderedAttachments
-	};
+	if (orderedAttachments.length > 0) {
+		archives.push({
+			name: archiveName,
+			attachments: orderedAttachments,
+		});
+	}
+
+	return [...archives, ...nestedArchives];
+};
+
+export const extractZipArchives = async (file: File): Promise<ProcessedZipArchive[]> => {
+	const archiveBytes = new Uint8Array(await file.arrayBuffer());
+
+	return extractZipEntries(archiveBytes, file.name);
 };