From eee26d06b769be1de9883eadd72d128f6cabd68a Mon Sep 17 00:00:00 2001
From: IluaAir <ilya@air.ru>
Date: Mon, 6 Oct 2025 23:09:38 +0300
Subject: [PATCH] add fingerprint

---
 taskncoffee-app/src/apiv1/fingerprint.js | 42 ++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 taskncoffee-app/src/apiv1/fingerprint.js

diff --git a/taskncoffee-app/src/apiv1/fingerprint.js b/taskncoffee-app/src/apiv1/fingerprint.js
new file mode 100644
index 0000000..050fa73
--- /dev/null
+++ b/taskncoffee-app/src/apiv1/fingerprint.js
@@ -0,0 +1,42 @@
+import FingerprintJS from '@fingerprintjs/fingerprintjs';
+
+let fpPromise = null;
+
+/**
+ * @returns {Promise} Promise с экземпляром FingerprintJS
+ */
+const initFingerprint = () => {
+  if (!fpPromise) {
+    fpPromise = FingerprintJS.load();
+  }
+  return fpPromise;
+};
+
+/**
+ * @returns {Promise<string>} Fingerprint ID
+ */
+export const getFingerprint = async () => {
+  try {
+    const savedFingerprint = localStorage.getItem('fingerprint');
+    if (savedFingerprint) {
+      return savedFingerprint;
+    }
+
+    const fp = await initFingerprint();
+    const result = await fp.get();
+    const fingerprint = result.visitorId;
+
+    localStorage.setItem('fingerprint', fingerprint);
+    return fingerprint;
+  } catch (error) {
+    console.error('Error getting fingerprint:', error);
+    const fallbackFingerprint = `fallback_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
+    localStorage.setItem('fingerprint', fallbackFingerprint);
+    return fallbackFingerprint;
+  }
+};
+
+export const clearFingerprint = () => {
+  localStorage.removeItem('fingerprint');
+};
+