Advanced file sharing

This is a WIP for advanced file sharing, but I won't pursue this for now since using symlinks in the file system works for me, and this is adding a ton of complexity I don't want or need right now.

routes/files/open/[fileName].tsx

@@ -1,7 +1,7 @@
 import { Handlers } from 'fresh/server.ts';
 
 import { FreshContextState } from '/lib/types.ts';
-import { getFile } from '/lib/data/files.ts';
+import { getFile, getDirectoryAccess, getFileAccess } from '/lib/data/files.ts';
 
 interface Data {}
 
@@ -31,9 +31,25 @@ export const handler: Handlers<Data, FreshContextState> = {
       currentPath = `${currentPath}/`;
     }
 
-    // TODO: Verify user has read or write access to path/file and get the appropriate ownerUserId
+    let { hasWriteAccess, ownerUserId, ownerParentPath } = await getFileAccess(
+      context.state.user.id,
+      currentPath,
+      decodeURIComponent(fileName),
+    );
 
-    const fileResult = await getFile(context.state.user.id, currentPath, decodeURIComponent(fileName));
+    if (!hasWriteAccess) {
+      const directoryAccessResult = await getDirectoryAccess(context.state.user.id, currentPath);
+
+      hasWriteAccess = directoryAccessResult.hasWriteAccess;
+      ownerUserId = directoryAccessResult.ownerUserId;
+      ownerParentPath = directoryAccessResult.ownerParentPath;
+
+      if (!hasWriteAccess) {
+        return new Response('Forbidden', { status: 403 });
+      }
+    }
+
+    const fileResult = await getFile(ownerUserId, ownerParentPath, decodeURIComponent(fileName));
 
     if (!fileResult.success) {
       return new Response('Not Found', { status: 404 });