feat: add ha_info, ha_shopping_items endpoints and avahi mDNS service file for HACS integration

- api/index.php: new haGetInfo() endpoint (unique_id, version, instance, items count)
- api/index.php: new haGetShoppingItems() endpoint (Bring! + internal shopping list)
- api/index.php: haInventorySensor() now accepts ?expiry_days=N query param
- api/cron_smart_shopping.php: auto-register avahi mDNS service if avahi-daemon present
- docker/avahi-evershelf.xml: Zeroconf _evershelf._tcp service declaration
- .env.example: add INSTANCE_NAME variable (used by HA integration for device label)

.env.example

@@ -129,6 +129,11 @@ GDRIVE_RETENTION_DAYS=30
 # Leave empty to allow anyone with access to the server to change settings.
 SETTINGS_TOKEN=
 
+# INSTANCE_NAME: display name for this EverShelf instance (used by the HA integration
+# for Zeroconf discovery label and device name in Home Assistant).
+# Defaults to the server hostname if left empty.
+INSTANCE_NAME=
+
 # ── Home Assistant Integration ────────────────────────────────────────────────
 # All HA settings can also be configured from the Settings → 🏠 tab.
 #

api/cron_smart_shopping.php

@@ -197,3 +197,23 @@ if (env('HA_ENABLED', 'false') === 'true' && env('HA_WEBHOOK_ID', '') !== '') {
         echo '[' . date('Y-m-d H:i:s') . '] HA expiry hook warning: ' . $haE->getMessage() . "\n";
     }
 }
+
+// ── Avahi/mDNS discovery registration ─────────────────────────────────────────
+// If avahi-daemon is running on this host, register the _evershelf._tcp service
+// so that Home Assistant can auto-discover this instance via Zeroconf.
+if (function_exists('shell_exec')) {
+    try {
+        $avahiService = '/etc/avahi/services/evershelf.xml';
+        // Only create/update if avahi-daemon is installed and the file doesn't exist yet
+        if (!file_exists($avahiService) && (shell_exec('which avahi-daemon 2>/dev/null') || shell_exec('which avahi-publish 2>/dev/null'))) {
+            $template = __DIR__ . '/../docker/avahi-evershelf.xml';
+            if (file_exists($template)) {
+                $xml = file_get_contents($template);
+                @file_put_contents($avahiService, $xml);
+                echo '[' . date('Y-m-d H:i:s') . '] Avahi mDNS service registered at ' . $avahiService . "\n";
+            }
+        }
+    } catch (Throwable $avahiE) {
+        // Non-fatal: avahi not available
+    }
+}

api/index.php

@@ -931,6 +931,14 @@ try {
             haInventorySensor(getDB());
             break;
 
+        case 'ha_info':
+            haGetInfo(getDB());
+            break;
+
+        case 'ha_shopping_items':
+            haGetShoppingItems(getDB());
+            break;
+
         case 'ha_test':
             haTestConnection();
             break;
@@ -1349,12 +1357,13 @@ function haInventorySensor(PDO $db): void {
     header('Content-Type: application/json; charset=utf-8');
     header('Access-Control-Allow-Origin: *');
 
-    $sensor = strtolower(trim($_GET['sensor'] ?? 'overview'));
+    $sensor     = strtolower(trim($_GET['sensor'] ?? 'overview'));
+    $expiryDays = max(1, min(90, (int)($_GET['expiry_days'] ?? env('HA_EXPIRY_DAYS', 3))));
 
     try {
         $expiring = (int)$db->query(
             "SELECT COUNT(*) FROM inventory WHERE quantity > 0 AND expiry_date IS NOT NULL
-             AND expiry_date BETWEEN date('now') AND date('now', '+3 days')"
+             AND expiry_date BETWEEN date('now') AND date('now', '+{$expiryDays} days')"
         )->fetchColumn();
 
         $expired = (int)$db->query(
@@ -1469,6 +1478,70 @@ function haTestConnection(): void {
 }
 
 
+// ===== HA DISCOVERY INFO =====
+
+/**
+ * Returns device info for HA Zeroconf discovery confirmation.
+ * GET /api/index.php?action=ha_info
+ * Response: { name, instance, version, unique_id, has_token, api_version, items_count }
+ */
+function haGetInfo(PDO $db): void {
+    header('Content-Type: application/json; charset=utf-8');
+    header('Access-Control-Allow-Origin: *');
+    // Stable unique_id derived from server identity (survives restarts)
+    $uniqueId    = 'evershelf_' . substr(md5(__DIR__ . php_uname('n')), 0, 12);
+    $itemsCount  = (int)$db->query("SELECT COUNT(*) FROM inventory WHERE quantity > 0")->fetchColumn();
+    echo json_encode([
+        'name'        => 'EverShelf',
+        'instance'    => env('INSTANCE_NAME', php_uname('n')),
+        'version'     => _appVersion(),
+        'unique_id'   => $uniqueId,
+        'has_token'   => !empty(env('SETTINGS_TOKEN', '')),
+        'api_version' => 1,
+        'items_count' => $itemsCount,
+    ], JSON_UNESCAPED_UNICODE);
+}
+
+/**
+ * Returns shopping list items in a clean format suitable for HA todo entity.
+ * GET /api/index.php?action=ha_shopping_items
+ * Response: { items: [{id, name, note}], count, mode }
+ */
+function haGetShoppingItems(PDO $db): void {
+    header('Content-Type: application/json; charset=utf-8');
+    header('Access-Control-Allow-Origin: *');
+    try {
+        if (isShoppingBringMode()) {
+            $auth = bringAuth();
+            if (!$auth) {
+                echo json_encode(['items' => [], 'count' => 0, 'mode' => 'bring']);
+                return;
+            }
+            $listData = bringRequest('GET', "https://api.getbring.com/rest/v2/bringlists/{$auth['bringListUUID']}");
+            $items = array_map(fn($r) => [
+                'id'   => $r['uuid'] ?? md5(($r['name'] ?? '') . uniqid()),
+                'name' => $r['name'] ?? '',
+                'note' => $r['specification'] ?? '',
+            ], $listData['purchase'] ?? []);
+            echo json_encode(['items' => $items, 'count' => count($items), 'mode' => 'bring'], JSON_UNESCAPED_UNICODE);
+        } else {
+            $rows = $db->query(
+                "SELECT rowid AS id, name, specification AS note FROM shopping_list ORDER BY sort_order ASC, added_at ASC"
+            )->fetchAll(PDO::FETCH_ASSOC);
+            $items = array_map(fn($r) => [
+                'id'   => (string)$r['id'],
+                'name' => $r['name'],
+                'note' => $r['note'] ?? '',
+            ], $rows);
+            echo json_encode(['items' => $items, 'count' => count($items), 'mode' => 'internal'], JSON_UNESCAPED_UNICODE);
+        }
+    } catch (Throwable $e) {
+        http_response_code(500);
+        echo json_encode(['error' => $e->getMessage()]);
+    }
+}
+
+
 // ===== FOOD FACTS (cached daily) =====
 function getFoodFacts(): void {
     EverLog::info('getFoodFacts');

docker/avahi-evershelf.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" standalone='no'?>
+<!DOCTYPE service-group SYSTEM "avahi-service.dtd">
+<service-group>
+  <name replace-wildcards="yes">EverShelf Pantry (%h)</name>
+  <service>
+    <type>_evershelf._tcp</type>
+    <port>80</port>
+    <txt-record>path=/api/</txt-record>
+    <txt-record>version=1.0</txt-record>
+    <txt-record>app=evershelf</txt-record>
+  </service>
+</service-group>