fix(whatsapp): keep echo tracker log truncation UTF-16 safe (#102603)

Pandah97 · steipete · web-flow · commit 0a8677ec9948 · 2026-07-09T11:46:52.000+01:00
* fix(whatsapp): keep echo tracker log truncation UTF-16 safe

Replace `.slice(0, 50)` with `truncateUtf16Safe(text, 50)` in
echo tracker verbose log message to prevent surrogate pair corruption.

Ref. lsr911 pattern — mechanical substitution, no behavior change.

* test(whatsapp): cover UTF-16-safe echo previews

---------

Co-authored-by: Peter Steinberger &lt;steipete@gmail.com&gt;
diff --git a/extensions/whatsapp/src/auto-reply/monitor/echo.test.ts b/extensions/whatsapp/src/auto-reply/monitor/echo.test.ts
@@ -0,0 +1,18 @@
+import { describe, expect, it, vi } from "vitest";
+import { createEchoTracker } from "./echo.js";
+
+describe("createEchoTracker", () => {
+  it("keeps verbose previews UTF-16 safe without changing the tracked text", () => {
+    const logVerbose = vi.fn();
+    const tracker = createEchoTracker({ logVerbose });
+    const prefix = "x".repeat(49);
+    const text = `${prefix}😀tail`;
+
+    tracker.rememberText(text, { logVerboseMessage: true });
+
+    expect(logVerbose).toHaveBeenCalledExactlyOnceWith(
+      `Added to echo detection set (size now: 1): ${prefix}...`,
+    );
+    expect(tracker.has(text)).toBe(true);
+  });
+});
diff --git a/extensions/whatsapp/src/auto-reply/monitor/echo.ts b/extensions/whatsapp/src/auto-reply/monitor/echo.ts
@@ -1,4 +1,5 @@
 // Whatsapp plugin module implements echo behavior.
+import { truncateUtf16Safe } from "openclaw/plugin-sdk/text-utility-runtime";
 export type EchoTracker = {
   rememberText: (
     text: string | undefined,
@@ -48,7 +49,7 @@ export function createEchoTracker(params: {
     }
     if (opts.logVerboseMessage) {
       params.logVerbose?.(
-        `Added to echo detection set (size now: ${recentlySent.size}): ${text.slice(0, 50)}...`,
+        `Added to echo detection set (size now: ${recentlySent.size}): ${truncateUtf16Safe(text, 50)}...`,
       );
     }
     trim();

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,5 @@`
`1`	`1`	`// Whatsapp plugin module implements echo behavior.`
	`2`	`+import { truncateUtf16Safe } from "openclaw/plugin-sdk/text-utility-runtime";`
`2`	`3`	`export type EchoTracker = {`
`3`	`4`	`rememberText: (`
`4`	`5`	`text: string \| undefined,`
`@@ -48,7 +49,7 @@ export function createEchoTracker(params: {`
`48`	`49`	`}`
`49`	`50`	`if (opts.logVerboseMessage) {`
`50`	`51`	`params.logVerbose?.(`
`51`		- `Added to echo detection set (size now: ${recentlySent.size}): ${text.slice(0, 50)}...`,
	`52`	+ `Added to echo detection set (size now: ${recentlySent.size}): ${truncateUtf16Safe(text, 50)}...`,
`52`	`53`	`);`
`53`	`54`	`}`
`54`	`55`	`trim();`