bundles/nginx: use metadata reactor to determine index files

bundles/nginx/metadata.py

@@ -46,3 +46,27 @@ def letsencrypt(metadata):
             },
         },
     }
+
+
+@metadata_reactor
+def index_files(metadata):
+    vhosts = {}
+
+    for vhost, config in metadata.get('nginx/vhosts', {}).items():
+        vhosts[vhost] = {
+            'index': [
+                'index.html',
+                'index.htm',
+            ],
+        }
+
+        if config.get('php', False):
+            # If we're using PHP, make sure index.php is tried first
+            vhosts[vhost]['index'].insert(0, 'index.php')
+
+
+    return {
+        'nginx': {
+            'vhosts': vhosts,
+        },
+    }