fix(miio): Don't get confused by the system clock doing weird things

Hypfer · Feb 15, 2021 · 5e6d8df · 5e6d8df
1 parent 58515d9
commit 5e6d8df
Showing 1 changed file with 4 additions and 4 deletions.
diff --git a/lib/miio/Codec.js b/lib/miio/Codec.js
@@ -91,9 +91,9 @@ class Codec {
      */
     encode(msg, stamp, deviceId) {
         const cipher = crypto.createCipheriv("aes-128-cbc", this.tokenKey, this.tokenIV);
-        const encrypted =
-            msg === null ? Buffer.alloc(0) : Buffer.concat([cipher.update(msg), cipher.final()]);
-        const secondsPassed = Math.floor(Date.now() - stamp.time) / 1000;
+        const encrypted = msg === null ? Buffer.alloc(0) : Buffer.concat([cipher.update(msg), cipher.final()]);
+        const secondsPassed = Math.max(0, Math.floor((Date.now() - stamp.time) / 1000));
+
         const header = createMiioHeader({
             timestamp: stamp.val + secondsPassed,
             deviceId: deviceId,
@@ -113,4 +113,4 @@ class Codec {
     }
 }
 
-module.exports = Codec;
+module.exports = Codec;