handles zips in zip correctly

.idea/workspace.xml

@@ -3,9 +3,7 @@
   <component name="ChangeListManager">
     <list default="true" id="89f9fc3a-63ad-41cb-8d25-f07df352eb98" name="Changes" comment="">
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/lib/components/AttachmentPreview.svelte" beforeDir="false" afterPath="$PROJECT_DIR$/src/lib/components/AttachmentPreview.svelte" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/lib/zip-processing.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/lib/zip-processing.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/lib/components/ProcessedZipArchiveEditor.svelte" beforeDir="false" afterPath="$PROJECT_DIR$/src/lib/components/ProcessedZipArchiveEditor.svelte" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/routes/+page.svelte" beforeDir="false" afterPath="$PROJECT_DIR$/src/routes/+page.svelte" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -51,7 +49,7 @@
       <option name="presentableId" value="Default" />
       <updated>1781169139290</updated>
       <workItem from="1781169141138" duration="309000" />
-      <workItem from="1781251694220" duration="11612000" />
+      <workItem from="1781251694220" duration="12340000" />
     </task>
     <task id="LOCAL-00001" summary="adapts styling of rvg.legal">
       <option name="closed" value="true" />
@@ -101,7 +99,23 @@
       <option name="project" value="LOCAL" />
       <updated>1781261986439</updated>
     </task>
-    <option name="localTasksCounter" value="7" />
+    <task id="LOCAL-00007" summary="renders thumbnails">
+      <option name="closed" value="true" />
+      <created>1781263980882</created>
+      <option name="number" value="00007" />
+      <option name="presentableId" value="LOCAL-00007" />
+      <option name="project" value="LOCAL" />
+      <updated>1781263980882</updated>
+    </task>
+    <task id="LOCAL-00008" summary="ignores mac special folders">
+      <option name="closed" value="true" />
+      <created>1781264183729</created>
+      <option name="number" value="00008" />
+      <option name="presentableId" value="LOCAL-00008" />
+      <option name="project" value="LOCAL" />
+      <updated>1781264183729</updated>
+    </task>
+    <option name="localTasksCounter" value="9" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -117,7 +131,9 @@
     <MESSAGE value="parses xjustiz and orders attachments" />
     <MESSAGE value="renders preview of zips" />
     <MESSAGE value="design anpassungen" />
-    <option name="LAST_COMMIT_MESSAGE" value="design anpassungen" />
+    <MESSAGE value="renders thumbnails" />
+    <MESSAGE value="ignores mac special folders" />
+    <option name="LAST_COMMIT_MESSAGE" value="ignores mac special folders" />
   </component>
   <component name="XDebuggerManager">
     <breakpoint-manager>

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 extractZipEntries = async (archiveBytes: Uint8Array, fallbackName: string): Promise<ProcessedZipArchive[]> => {
-	const archiveBytes = new Uint8Array(await file.arrayBuffer());
 	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 {
+	if (orderedAttachments.length > 0) {
+		archives.push({
 			name: archiveName,
-		attachments: orderedAttachments
+			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);
 };

src/routes/+page.svelte

@@ -3,7 +3,7 @@
     import Card from "$lib/components/Card.svelte";
     import ProcessedZipArchiveEditor from "$lib/components/ProcessedZipArchiveEditor.svelte";
     import ZipDropzone from "$lib/components/ZipDropzone.svelte";
-    import { extractZipArchive, type ProcessedZipArchive } from "$lib/zip-processing";
+    import { extractZipArchives, type ProcessedZipArchive } from "$lib/zip-processing";
 
     const THUMBNAIL_WIDTH_STORAGE_KEY = "thumbnailWidth";
 
@@ -49,8 +49,8 @@
         pendingZipCount += 1;
 
         try {
-            const processedZipArchive = await extractZipArchive(file);
+            const processedZipArchives = await extractZipArchives(file);
-            processedZipFiles = [...processedZipFiles, processedZipArchive];
+            processedZipFiles = [...processedZipFiles, ...processedZipArchives];
         } catch (error) {
             console.error(`Failed to process ${file.name}`, error);
         } finally {