feat(isBase32): Add option for Crockford's base 32 alternative (#1888)

closes #1857 

* feat(crockforbase32): Add option for Crockford's base 32 alternative to isBase32 method

* test move out to its own it() statement

* Update README.md

Co-authored-by: Brage <brage.aarset@gmail.com>

Co-authored-by: Brage <brage.aarset@gmail.com>

Author: BigOsvaap

README.md

@@ -95,7 +95,7 @@ Validator                               | Description
 **isAlpha(str [, locale, options])**    | check if the string contains only letters (a-zA-Z).<br/><br/>Locale is one of `['ar', 'ar-AE', 'ar-BH', 'ar-DZ', 'ar-EG', 'ar-IQ', 'ar-JO', 'ar-KW', 'ar-LB', 'ar-LY', 'ar-MA', 'ar-QA', 'ar-QM', 'ar-SA', 'ar-SD', 'ar-SY', 'ar-TN', 'ar-YE', 'bg-BG', 'cs-CZ', 'da-DK', 'de-DE', 'el-GR', 'en-AU', 'en-GB', 'en-HK', 'en-IN', 'en-NZ', 'en-US', 'en-ZA', 'en-ZM', 'es-ES', 'fa-IR', 'fi-FI', 'fr-CA', 'fr-FR', 'he', 'hi-IN', 'hu-HU', 'it-IT', 'ku-IQ', 'nb-NO', 'nl-NL', 'nn-NO', 'pl-PL', 'pt-BR', 'pt-PT', 'ru-RU', 'sl-SI', 'sk-SK', 'sr-RS', 'sr-RS@latin', 'sv-SE', 'tr-TR', 'uk-UA']`) and defaults to `en-US`. Locale list is `validator.isAlphaLocales`. options is an optional object that can be supplied with the following key(s): ignore which can either be a String or RegExp of characters to be ignored e.g. " -" will ignore spaces and -'s.
 **isAlphanumeric(str [, locale, options])**      | check if the string contains only letters and numbers (a-zA-Z0-9).<br/><br/>Locale is one of `['ar', 'ar-AE', 'ar-BH', 'ar-DZ', 'ar-EG', 'ar-IQ', 'ar-JO', 'ar-KW', 'ar-LB', 'ar-LY', 'ar-MA', 'ar-QA', 'ar-QM', 'ar-SA', 'ar-SD', 'ar-SY', 'ar-TN', 'ar-YE', 'bg-BG', 'cs-CZ', 'da-DK', 'de-DE', 'el-GR', 'en-AU', 'en-GB', 'en-HK', 'en-IN', 'en-NZ', 'en-US', 'en-ZA', 'en-ZM', 'es-ES', 'fa-IR', 'fi-FI', 'fr-CA', 'fr-FR', 'he', 'hi-IN', 'hu-HU', 'it-IT', 'ku-IQ', 'nb-NO', 'nl-NL', 'nn-NO', 'pl-PL', 'pt-BR', 'pt-PT', 'ru-RU', 'sl-SI', 'sk-SK', 'sr-RS', 'sr-RS@latin', 'sv-SE', 'tr-TR', 'uk-UA']`) and defaults to `en-US`. Locale list is `validator.isAlphanumericLocales`. options is an optional object that can be supplied with the following key(s): ignore which can either be a String or RegExp of characters to be ignored e.g. " -" will ignore spaces and -'s.
 **isAscii(str)**                        | check if the string contains ASCII chars only.
-**isBase32(str)**                       | check if a string is base32 encoded.
+**isBase32(str [, options])**           | check if a string is base32 encoded. `options` is optional and defaults to `{crockford: false}`.<br/> When `crockford` is true it tests the given base32 encoded string using [Crockford's base32 alternative](http://www.crockford.com/base32.html).
 **isBase58(str)**                       | check if a string is base58 encoded.
 **isBase64(str [, options])**          | check if a string is base64 encoded. options is optional and defaults to `{urlSafe: false}`<br/> when `urlSafe` is true it tests the given base64 encoded string is [url safe](https://base64.guru/standards/base64url)
 **isBefore(str [, date])**              | check if the string is a date that's before the specified date.

src/lib/isBase32.js

@@ -1,9 +1,21 @@
 import assertString from './util/assertString';
+import merge from './util/merge';
 
 const base32 = /^[A-Z2-7]+=*$/;
+const crockfordBase32 = /^[A-HJKMNP-TV-Z0-9]+$/;
 
-export default function isBase32(str) {
+const defaultBase32Options = {
+  crockford: false,
+};
+
+export default function isBase32(str, options) {
   assertString(str);
+  options = merge(options, defaultBase32Options);
+
+  if (options.crockford) {
+    return crockfordBase32.test(str);
+  }
+
   const len = str.length;
   if (len % 8 === 0 && base32.test(str)) {
     return true;

test/validators.js

@@ -5753,6 +5753,25 @@ describe('Validators', () => {
     });
   });
 
+  it('should validate base32 strings with crockford alternative', () => {
+    test({
+      validator: 'isBase32',
+      args: [{ crockford: true }],
+      valid: [
+        '91JPRV3F41BPYWKCCGGG',
+        '60',
+        '64',
+        'B5QQA833C5Q20S3F41MQ8',
+      ],
+      invalid: [
+        '91JPRV3F41BUPYWKCCGGG',
+        'B5QQA833C5Q20S3F41MQ8L',
+        '60I',
+        'B5QQA833OULIC5Q20S3F41MQ8',
+      ],
+    });
+  });
+
   it('should validate base58 strings', () => {
     test({
       validator: 'isBase58',