feat(isCpf): Add Brazilian CPF validation

src/index.js

@@ -121,6 +121,8 @@ import isStrongPassword from './lib/isStrongPassword';
 
 import isVAT from './lib/isVAT';
 
+import isCpf from './lib/isCpf';
+
 const version = '13.6.0';
 
 const validator = {
@@ -225,6 +227,7 @@ const validator = {
   isLicensePlate,
   isVAT,
   ibanLocales,
+  isCpf,
 };
 
 export default validator;

src/lib/isCpf.js

@@ -0,0 +1,44 @@
+import assertString from './util/assertString';
+
+// Brazilian CPF (Cadastro de Pessoas Físicas)
+
+export default function isCpf(cpfString) {
+  assertString(cpfString);
+
+  let sum = 0;
+  let rest;
+
+  const cpf = cpfString.toString().replace(/[^0-9]+/g, '');
+
+  if (cpf === '00000000000') {
+    return false;
+  }
+
+  for (let i = 1; i <= 9; i++) {
+    sum += parseInt(cpf.substring(i - 1, i), 10) * (11 - i);
+  }
+  rest = (sum * 10) % 11;
+
+  if (rest === 10 || rest === 11) {
+    rest = 0;
+  }
+  if (rest !== parseInt(cpf.substring(9, 10), 10)) {
+    return false;
+  }
+
+  sum = 0;
+  for (let i = 1; i <= 10; i++) {
+    sum += parseInt(cpf.substring(i - 1, i), 10) * (12 - i);
+  }
+  rest = (sum * 10) % 11;
+
+  if (rest === 10 || rest === 11) {
+    rest = 0;
+  }
+
+  if (rest !== parseInt(cpf.substring(10, 11), 10)) {
+    return false;
+  }
+  return true;
+}
+

test/validators.js

@@ -11070,4 +11070,14 @@ describe('Validators', () => {
       ],
     });
   });
+
+  it('should validate if has a valid brazilian cpf', () => {
+    test({
+      validator: 'isCpf',
+      args: ['57170743019', '25997505049', '465.839.300-05', '369.440.070-29',
+        '918.309.182-03', '12839471041', '84018401229'],
+      valid: ['57170743019', '25997505049', '465.839.300-05', '369.440.070-29'],
+      invalid: ['918.309.182-03', '12839471041', '84018401229'],
+    });
+  });
 });