Change the way numbers are validated on whatsapp

Author: judsonjuniorr

package.json

@@ -60,7 +60,6 @@
     "exiftool-vendored": "^22.0.0",
     "express": "^4.18.2",
     "express-async-errors": "^3.1.1",
-    "fast-levenshtein": "^3.0.0",
     "form-data": "^4.0.0",
     "hbs": "^4.2.0",
     "https-proxy-agent": "^7.0.2",
@@ -94,7 +93,6 @@
     "@types/compression": "^1.7.2",
     "@types/cors": "^2.8.13",
     "@types/express": "^4.17.17",
-    "@types/fast-levenshtein": "^0.0.4",
     "@types/js-yaml": "^4.0.5",
     "@types/jsonwebtoken": "^8.5.9",
     "@types/mime-types": "^2.1.1",

src/whatsapp/services/whatsapp.baileys.service.ts

@@ -41,7 +41,6 @@ import axios from 'axios';
 import { exec } from 'child_process';
 import { arrayUnique, isBase64, isURL } from 'class-validator';
 import EventEmitter2 from 'eventemitter2';
-import levenshtein from 'fast-levenshtein';
 import fs, { existsSync, readFileSync } from 'fs';
 import Long from 'long';
 import NodeCache from 'node-cache';
@@ -2455,24 +2454,58 @@ export class BaileysStartupService extends WAStartupService {
       owner: this.instance.name,
       ids: jids.users.map(({ jid }) => (jid.startsWith('+') ? jid.substring(1) : jid)),
     });
-    const verify = await this.client.onWhatsApp(
-      ...jids.users.map(({ jid }) => (!jid.startsWith('+') ? `+${jid}` : jid)),
-    );
+    const numbersToVerify = jids.users.map(({ jid }) => jid.replace('+', ''));
+    const verify = await this.client.onWhatsApp(...numbersToVerify);
     const users: OnWhatsAppDto[] = await Promise.all(
       jids.users.map(async (user) => {
-        const MAX_SIMILARITY_THRESHOLD = 0.01;
-        const isBrWithDigit = user.jid.startsWith('55') && user.jid.slice(4, 5) === '9' && user.jid.length === 28;
-        const jid = isBrWithDigit ? user.jid.slice(0, 4) + user.jid.slice(5) : user.jid;
-
-        const numberVerified = verify.find((v) => {
-          const mainJidSimilarity = levenshtein.get(user.jid, v.jid) / Math.max(user.jid.length, v.jid.length);
-          const jidSimilarity = levenshtein.get(jid, v.jid) / Math.max(jid.length, v.jid.length);
-          return mainJidSimilarity <= MAX_SIMILARITY_THRESHOLD || jidSimilarity <= MAX_SIMILARITY_THRESHOLD;
-        });
+        let numberVerified: (typeof verify)[0] | null = null;
+
+        // Brazilian numbers
+        if (user.number.startsWith('55')) {
+          const numberWithDigit =
+            user.number.slice(4, 5) === '9' && user.number.length === 13
+              ? user.number
+              : `${user.number.slice(0, 4)}9${user.number.slice(4)}`;
+          const numberWithoutDigit =
+            user.number.length === 12 ? user.number : user.number.slice(0, 4) + user.number.slice(5);
+
+          numberVerified = verify.find(
+            (v) => v.jid === `${numberWithDigit}@s.whatsapp.net` || v.jid === `${numberWithoutDigit}@s.whatsapp.net`,
+          );
+        }
+
+        // Mexican/Argentina numbers
+        // Ref: https://faq.whatsapp.com/1294841057948784
+        if (!numberVerified && (user.number.startsWith('52') || user.number.startsWith('54'))) {
+          let prefix = '';
+          if (user.number.startsWith('52')) {
+            prefix = '1';
+          }
+          if (user.number.startsWith('54')) {
+            prefix = '9';
+          }
+
+          const numberWithDigit =
+            user.number.slice(2, 3) === prefix && user.number.length === 13
+              ? user.number
+              : `${user.number.slice(0, 2)}${prefix}${user.number.slice(2)}`;
+          const numberWithoutDigit =
+            user.number.length === 12 ? user.number : user.number.slice(0, 2) + user.number.slice(3);
+
+          numberVerified = verify.find(
+            (v) => v.jid === `${numberWithDigit}@s.whatsapp.net` || v.jid === `${numberWithoutDigit}@s.whatsapp.net`,
+          );
+        }
+
+        if (!numberVerified) {
+          numberVerified = verify.find((v) => v.jid === user.jid);
+        }
+
+        const numberJid = numberVerified?.jid || user.jid;
         return {
           exists: !!numberVerified?.exists,
-          jid: numberVerified?.jid || user.jid,
-          name: contacts.find((c) => c.id === jid)?.pushName,
+          jid: numberJid,
+          name: contacts.find((c) => c.id === numberJid)?.pushName,
           number: user.number,
         };
       }),