From ac0c5290c8824d9f398c1e9667dba0bb20186d67 Mon Sep 17 00:00:00 2001
From: Carlos Alexandre <capcj@protonmail.com>
Date: Mon, 13 Jul 2020 17:33:37 -0300
Subject: [PATCH] [exports-validate] Exports validate to provide a easy method
 to validate checksums without needing to call decode with try/catch

---
 emvqr/emvqr.js     | 12 ++++++------
 test/emvqr.spec.js | 15 +++++++++++++--
 2 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/emvqr/emvqr.js b/emvqr/emvqr.js
index 82e4b34..ed454af 100644
--- a/emvqr/emvqr.js
+++ b/emvqr/emvqr.js
@@ -1,8 +1,7 @@
-
 const crc = require('./crc');
 const { getTag, getSubTag } = require('./scheme');
 
-const validate = (text) => {
+const validate = text => {
     const data = text.substring(0, text.length - 4);
     const checksum = text.substring(text.length - 4);
 
@@ -42,7 +41,7 @@ const read = (text, describe, tagId) => {
             id,
             name: subtag ? subtag.name : tag.name,
             len,
-            data
+            data,
         };
     }
     else {
@@ -52,12 +51,12 @@ const read = (text, describe, tagId) => {
     if (next.length) {
         return {
             [id]: value,
-            ...read(next, describe, tagId)
+            ...read(next, describe, tagId),
         };
     }
     else {
         return {
-            [id]: value
+            [id]: value,
         };
     }
 };
@@ -71,5 +70,6 @@ const decode = (text, tiny = false) => {
 };
 
 module.exports = {
-    decode
+    decode,
+    validate,
 };
diff --git a/test/emvqr.spec.js b/test/emvqr.spec.js
index c8da9a7..27784bf 100644
--- a/test/emvqr.spec.js
+++ b/test/emvqr.spec.js
@@ -1,6 +1,10 @@
 const emvqr = require('../emvqr/emvqr');
 
-const emvqrHelloWorldExample = '00020101021229300012D156000000000510A93FO3230Q31280012D15600000001030812345678520441115802CN5914BEST TRANSPORT6007BEIJING64200002ZH0104最佳运输0202北京540523.7253031565502016233030412340603***0708A60086670902ME91320016A0112233449988770708123456786304A13A';
+const emvqrHelloWorldExample =
+  '00020101021229300012D156000000000510A93FO3230Q31280012D15600000001030812345678520441115802CN5914BEST TRANSPORT6007BEIJING64200002ZH0104最佳运输0202北京540523.7253031565502016233030412340603***0708A60086670902ME91320016A0112233449988770708123456786304A13A';
+
+const emvqrBadChecksumExample =
+  '00020101021229300012D156000000000510A93FO3230Q31280012D15600000001030812345678520441115802CN5914BEZT TRANSPORT6007BEIJING64200002ZH0104最佳运输0202北京540523.7253031565502016233030412340603***0708A60086670902ME91320016A0112233449988770708123456786304A13A';
 
 test('should return a valid object, when its called', () => {
     const emvObject = emvqr.decode(emvqrHelloWorldExample);
@@ -21,8 +25,15 @@ test('valid expected output for emvqr string example', () => {
 });
 
 test('should throw an error, when its called with an invalid checksum', () => {
-    const emvqrBadChecksumExample = '00020101021229300012D156000000000510A93FO3230Q31280012D15600000001030812345678520441115802CN5914BEZT TRANSPORT6007BEIJING64200002ZH0104最佳运输0202北京540523.7253031565502016233030412340603***0708A60086670902ME91320016A0112233449988770708123456786304A13A';
     expect(() => {
         emvqr.decode(emvqrBadChecksumExample);
     }).toThrow(Error);
 });
+
+test('should return true, when its called with a valid checksum', () => {
+    expect(emvqr.validate(emvqrHelloWorldExample)).toBe(true);
+});
+
+test('should return false, when its called with a invalid checksum', () => {
+    expect(emvqr.validate(emvqrBadChecksumExample)).toBe(false);
+});