From b563fd677f89fc095b219f1753058ecb866c66c4 Mon Sep 17 00:00:00 2001
From: Ygor Azambuja <ygorazambuja@gmail.com>
Date: Sun, 3 Oct 2021 16:23:43 -0400
Subject: [PATCH 1/4] feat: add brazilian cpf validation

---
 src/lib/isCpf.js | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 src/lib/isCpf.js

diff --git a/src/lib/isCpf.js b/src/lib/isCpf.js
new file mode 100644
index 000000000..442a96217
--- /dev/null
+++ b/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;
+}
+

From db12f108754f6ea482848210587728088ddd48cf Mon Sep 17 00:00:00 2001
From: Ygor Azambuja <ygorazambuja@gmail.com>
Date: Sun, 3 Oct 2021 16:23:53 -0400
Subject: [PATCH 2/4] feat: add isCpf on index

---
 src/index.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/index.js b/src/index.js
index a0e8aa63c..6d6e380eb 100644
--- a/src/index.js
+++ b/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;

From 3cc9c0f8a6e4915cc9352a31b2d5ecb2787b2da6 Mon Sep 17 00:00:00 2001
From: Ygor Azambuja <ygorazambuja@gmail.com>
Date: Sun, 3 Oct 2021 16:24:08 -0400
Subject: [PATCH 3/4] add isCpf on tests

---
 test/validators.js | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/test/validators.js b/test/validators.js
index 91794d521..474e0ac89 100644
--- a/test/validators.js
+++ b/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'],
+    });
+  });
 });

From 462c897386939e5f914441b1955c620a0bb2262b Mon Sep 17 00:00:00 2001
From: Ygor Azambuja <ygorazambuja@gmail.com>
Date: Sun, 3 Oct 2021 18:18:17 -0400
Subject: [PATCH 4/4] refactor: add more test cases

---
 test/validators.js | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/test/validators.js b/test/validators.js
index 474e0ac89..6bf6a5dc4 100644
--- a/test/validators.js
+++ b/test/validators.js
@@ -11074,10 +11074,23 @@ 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'],
+      args: ['57170743019',
+        '25997505049',
+        '465.839.300-05',
+        '369.440.070-29',
+        '918.309.182-03',
+        '12839471041',
+        '84018401229',
+        '1309972150',
+        '1570758018',
+      ],
       valid: ['57170743019', '25997505049', '465.839.300-05', '369.440.070-29'],
-      invalid: ['918.309.182-03', '12839471041', '84018401229'],
+      invalid: ['918.309.182-03',
+        '12839471041',
+        '84018401229',
+        '00000000000',
+        '1309972150',
+        '1570758018'],
     });
   });
 });