fix: improve photo authentication middleware for thumbnails

- Add eventId check from JWT token for thumbnail access
- Better error logging for debugging authentication issues
- Add admin debug endpoint to check photo existence
- More permissive thumbnail access when valid gallery token exists

This should help diagnose why photos are returning 404 errors in production.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

backend/src/middleware/photoAuth.js

@@ -8,6 +8,8 @@ async function photoAuth(req, res, next) {
     // Extract event slug from the path
     let eventSlug;
     
+    console.log('PhotoAuth middleware - path:', req.path);
+    
     // For thumbnails, we need to parse the filename to get the event info
     if (req.path.startsWith('/thumb_')) {
       // For now, we'll rely on JWT token for thumbnail access
@@ -26,9 +28,22 @@ async function photoAuth(req, res, next) {
         
         // Check if it's a gallery token
         if (decoded.type === 'gallery') {
-          // For thumbnails, we accept any valid gallery token
+          // For thumbnails, we need to verify the token is for a valid event
           if (!eventSlug) {
-            const event = await db('events').where({ slug: decoded.eventSlug, is_active: formatBoolean(true) }).first();
+            // Extract event ID from the decoded token
+            if (decoded.eventId) {
+              const event = await db('events')
+                .where({ id: decoded.eventId, is_active: formatBoolean(true) })
+                .first();
+              if (event) {
+                req.event = event;
+                return next();
+              }
+            }
+            // Fallback to slug
+            const event = await db('events')
+              .where({ slug: decoded.eventSlug, is_active: formatBoolean(true) })
+              .first();
             if (event) {
               req.event = event;
               return next();
@@ -36,7 +51,9 @@ async function photoAuth(req, res, next) {
           }
           // For regular photos, check if token matches the event
           else if (decoded.eventSlug === eventSlug) {
-            const event = await db('events').where({ slug: eventSlug, is_active: formatBoolean(true) }).first();
+            const event = await db('events')
+              .where({ slug: eventSlug, is_active: formatBoolean(true) })
+              .first();
             if (event) {
               req.event = event;
               return next();
@@ -46,18 +63,12 @@ async function photoAuth(req, res, next) {
         
         // Check if it's an admin token (admins can view all photos)
         if (decoded.type === 'admin') {
-          if (!eventSlug) {
-            // For thumbnails with admin token, allow access
-            return next();
-          }
-          const event = await db('events').where({ slug: eventSlug }).first();
-          if (event) {
-            req.event = event;
-            return next();
-          }
+          // For both thumbnails and photos with admin token, allow access
+          return next();
         }
       } catch (err) {
         // Token invalid, fall through to password check
+        console.error('JWT verification failed:', err.message);
       }
     }
     
@@ -68,8 +79,8 @@ async function photoAuth(req, res, next) {
       return res.status(401).json({ error: 'Authentication required' });
     }
     
-    // If no eventSlug (thumbnails), we require JWT token
-    if (!eventSlug) {
+    // If no eventSlug (thumbnails), and we don't have valid auth yet, deny access
+    if (!eventSlug && !password) {
       return res.status(401).json({ error: 'Authentication required for thumbnails' });
     }