Handle Unicode characters

Author: Secreto31126

src/index.ts

@@ -24,6 +24,7 @@ import type {
     OnStatus,
     OnStatusArgs
 } from "./emitters";
+import { escapeUnicode } from "./utils";
 
 /**
  * The main API Class
@@ -730,7 +731,7 @@ export default class WhatsAppAPI {
                 ["sign", "verify"]
             );
 
-            const data = encoder.encode(raw_body);
+            const data = encoder.encode(escapeUnicode(raw_body));
             const result = await this.subtle.sign("HMAC", key, data.buffer);
             const result_array = Array.from(new Uint8Array(result));
 

src/utils.ts

@@ -4,6 +4,13 @@ export function isInteger(n: unknown): n is number {
     return Number.isInteger(n);
 }
 
+export function escapeUnicode(str: string) {
+    // https://stackoverflow.com/a/40558081
+    return str.replace(/[^\0-~]/g, (ch) => {
+        return "\\u" + ("000" + ch.charCodeAt(0).toString(16)).slice(-4);
+    });
+}
+
 type Without<T, U> = { [P in Exclude<keyof T, keyof U>]?: never };
 export type XOR<T, U> = T | U extends object
     ? (Without<T, U> & U) | (Without<U, T> & T)

test/index.test.cjs

@@ -1520,9 +1520,9 @@ describe("WhatsAppAPI", function () {
             const phoneID = "1";
             const user = "2";
             const body =
-                "Let's pretend this body is equal to the message object";
+                "Let's pretend this body is equal to the message object and can handle unicode characters like みどりいろ and J'ai mangé des pâtes";
             const signature =
-                "sha256=8d2c8fd74d3ac31eafd99563ac39107a45e5ea1d44831e291353193729d57f56";
+                "sha256=0363007aabdf1ab579f35936651a460fb5fa1aaf40df98b1264446b72cc96688";
 
             const name = "name";
             const message = {