zips are getting extracted

src/lib/zip-processing.ts

@@ -0,0 +1,99 @@
+import { unzip } from "fflate";
+
+export type ZipAttachmentKind = "pdf" | "image";
+
+export type ZipAttachment = {
+	name: string;
+	path: string;
+	kind: ZipAttachmentKind;
+	data: Uint8Array;
+};
+
+export type ProcessedZipArchive = {
+	name: string;
+	attachments: ZipAttachment[];
+	xjustizNachrichtXml: Uint8Array | null;
+};
+
+const IMAGE_EXTENSIONS = new Set([
+	".avif",
+	".bmp",
+	".gif",
+	".heic",
+	".jpeg",
+	".jpg",
+	".jp2",
+	".png",
+	".tif",
+	".tiff",
+	".webp",
+]);
+
+const ZIP_META_FILE_NAME = "xjustiz_nachricht.xml";
+
+const unzipArchive = (data: Uint8Array) =>
+	new Promise<Record<string, Uint8Array>>((resolve, reject) => {
+		unzip(data, (error, files) => {
+			if (error) {
+				reject(error);
+				return;
+			}
+
+			resolve(files);
+		});
+	});
+
+const getBaseName = (path: string) => path.split("/").pop() ?? path;
+
+const getExtension = (path: string) => {
+	const baseName = getBaseName(path).toLowerCase();
+	const lastDotIndex = baseName.lastIndexOf(".");
+
+	return lastDotIndex === -1 ? "" : baseName.slice(lastDotIndex);
+};
+
+const isPdf = (path: string) => getExtension(path) === ".pdf";
+
+const isImage = (path: string) => IMAGE_EXTENSIONS.has(getExtension(path));
+
+export const extractZipArchive = async (file: File): Promise<ProcessedZipArchive> => {
+	const archiveBytes = new Uint8Array(await file.arrayBuffer());
+	const files = await unzipArchive(archiveBytes);
+
+	const attachments: ZipAttachment[] = [];
+	let xjustizNachrichtXml: Uint8Array | null = null;
+
+	for (const [path, data] of Object.entries(files)) {
+		const baseName = getBaseName(path);
+
+		if (baseName.toLowerCase() === ZIP_META_FILE_NAME) {
+			xjustizNachrichtXml = data;
+			continue;
+		}
+
+		if (isPdf(path)) {
+			attachments.push({
+				name: baseName,
+				path,
+				kind: "pdf",
+				data,
+			});
+			continue;
+		}
+
+		if (isImage(path)) {
+			attachments.push({
+				name: baseName,
+				path,
+				kind: "image",
+				data,
+			});
+		}
+	}
+
+	return {
+		name: file.name,
+		attachments,
+		xjustizNachrichtXml,
+	};
+};