elements/img: fall back to source tile by-id when baked derivative missing (data/elements was a dangling symlink on prod)

dfe2bceaee527b5f786297a70dfd6f5ec6494c8c · 2026-05-30 12:08:25 -0700 · Steve Abrams

Files touched

M server.js

Diff

commit dfe2bceaee527b5f786297a70dfd6f5ec6494c8c
Author: Steve Abrams <steve@designerwallcoverings.com>
Date:   Sat May 30 12:08:25 2026 -0700

    elements/img: fall back to source tile by-id when baked derivative missing (data/elements was a dangling symlink on prod)
---
 server.js | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/server.js b/server.js
index 46ba167..d1a0dfe 100644
--- a/server.js
+++ b/server.js
@@ -2579,10 +2579,21 @@ app.get('/api/admin/mid-heal-preview/sample', (req, res) => {
 
 // Serve baked element derivatives. These live outside the public
 // /designs/img/ tree so they can be cleared without touching source tiles.
-app.use('/elements/img', express.static(
-  path.join(__dirname, 'data', 'elements'),
-  { maxAge: '30d' }
-));
+app.get('/elements/img/:file', (req, res) => {
+  // Serve the baked derivative if present; otherwise fall back to the source
+  // tile by-id (data/elements can be cleared/symlinked-away without touching
+  // source tiles, so a missing bake must degrade to the live image, never 404).
+  const file = req.params.file;
+  if (!/^[A-Za-z0-9._-]+$/.test(file)) return res.status(404).end();
+  const fp = path.join(__dirname, 'data', 'elements', file);
+  if (fs.existsSync(fp)) {
+    res.set('Cache-Control', 'public, max-age=2592000');
+    return res.sendFile(fp);
+  }
+  const m = String(file).match(/^(\d+)_/);
+  if (m) return res.redirect(302, '/designs/img/by-id/' + m[1]);
+  return res.status(404).end();
+});
 
 app.get('/api/admin/elements/items', (req, res) => {
   if (!isAdmin(req)) return res.status(404).json({ error: 'not found' });

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