Max file upload 500MB

convex/files.ts

@@ -12,6 +12,25 @@ export const generateUploadUrl = mutation({
   },
 });
 
+const MAX_ATTACHMENT_SIZE = 500 * 1024 * 1024; // 500MB
+
+// Validate uploaded file size and return its URL. Deletes file if too large.
+export const validateUpload = mutation({
+  args: { storageId: v.id("_storage") },
+  returns: v.string(),
+  handler: async (ctx, args) => {
+    const meta = await ctx.storage.getMetadata(args.storageId);
+    if (!meta) throw new Error("File not found in storage");
+    if (meta.size > MAX_ATTACHMENT_SIZE) {
+      await ctx.storage.delete(args.storageId);
+      throw new Error("File must be under 500MB");
+    }
+    const url = await getPublicStorageUrl(ctx, args.storageId);
+    if (!url) throw new Error("Failed to get file URL");
+    return url;
+  },
+});
+
 // Get file URL from storage ID
 export const getFileUrl = query({
   args: { storageId: v.id("_storage") },

packages/shared/src/components/ChatArea.jsx

@@ -1072,7 +1072,8 @@ const ChatArea = ({ channelId, channelName, channelType, username, channelKey, u
         setInput(inputDivRef.current.textContent);
     };
 
-    const processFile = (file) => { setPendingFiles(prev => [...prev, file]); };
+    const MAX_ATTACHMENT_SIZE = 500 * 1024 * 1024; // 500MB
+    const processFile = (file) => { if (file.size > MAX_ATTACHMENT_SIZE) { alert('File must be under 500MB'); return; } setPendingFiles(prev => [...prev, file]); };
     const handleFileSelect = (e) => { if (e.target.files && e.target.files.length > 0) Array.from(e.target.files).forEach(processFile); };
     const isExternalFileDrag = (e) => {
         const types = Array.from(e.dataTransfer.types);
@@ -1095,7 +1096,7 @@ const ChatArea = ({ channelId, channelName, channelType, username, channelKey, u
         const uploadRes = await fetch(uploadUrl, { method: 'POST', headers: { 'Content-Type': blob.type }, body: blob });
         const { storageId } = await uploadRes.json();
 
-        const fileUrl = await convex.query(api.files.getFileUrl, { storageId });
+        const fileUrl = await convex.mutation(api.files.validateUpload, { storageId });
 
         const metadata = {
             type: 'attachment',