keep trying

Signed-off-by: Kenneth Obsequio <k80308392@gmail.com>

src/utils/assetUpload.util.js

@@ -0,0 +1,54 @@
+// utils/assetUpload.util.js
+//
+// Client-side gate for the Add Asset multi-file drop zone. Mirrors what the
+// backend actually knows how to classify (resolveFileType() in
+// assets.controller.js: image/video/audio by MIME prefix, everything else
+// under application/* or text/* becomes "document") but rejects generic
+// binaries up front instead of letting them 500 on the server.
+
+const ALLOWED_DOCUMENT_MIME_TYPES = new Set([
+    "application/pdf",
+    "application/msword",
+    "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
+    "application/vnd.ms-excel",
+    "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+    "application/vnd.ms-powerpoint",
+    "application/vnd.openxmlformats-officedocument.presentationml.presentation",
+    "application/zip",
+    "application/x-zip-compressed",
+    "application/json",
+    "application/rtf",
+    "text/plain",
+    "text/csv",
+    "text/markdown",
+]);
+
+const ALLOWED_DOCUMENT_EXTENSIONS = new Set([
+    "pdf", "doc", "docx", "xls", "xlsx", "ppt", "pptx",
+    "zip", "json", "rtf", "txt", "csv", "md",
+]);
+
+export function fileExtension(filename = "") {
+    const dot = filename.lastIndexOf(".");
+    return dot > 0 ? filename.slice(dot + 1).toLowerCase() : "";
+}
+
+// { ok: true } or { ok: false, reason }
+export function validateAssetFile(file) {
+    const mime = file.type || "";
+
+    if (mime.startsWith("image/") || mime.startsWith("video/") || mime.startsWith("audio/")) {
+        return { ok: true };
+    }
+
+    const ext = fileExtension(file.name);
+    if (ALLOWED_DOCUMENT_MIME_TYPES.has(mime) || ALLOWED_DOCUMENT_EXTENSIONS.has(ext)) {
+        return { ok: true };
+    }
+
+    const label = ext ? `.${ext}` : (mime || "unknown");
+    return {
+        ok: false,
+        reason: `Unsupported file type "${label}". Allowed formats: images, video, audio, documents.`,
+    };
+}