Repository: validatorjs/validator.js
Pull request #2189 (2023-02-21 16:22:16)

new validator: isLocale, add support for validation of more valid language tags
## feat(isLocale): Add support for validation of more valid language tags

<!--
Add a descriptive title textbox above, e.g.
feat(validatorName): brief title of what has been done
-->

Implement [RFC 5646](https://www.rfc-editor.org/rfc/rfc5646.html) compliant regex to validate language tags and locales.

Fix for #2100

<!--- briefly describe what you have done in this PR --->

- https://www.w3.org/TR/ltli/
- https://www.w3.org/International/articles/language-tags/
- https://www.rfc-editor.org/rfc/rfc4647.html
- https://www.rfc-editor.org/rfc/rfc5646.html

<!--- provide some (credible) references showing the structure of the data to be validated, if applicable --->

## Checklist

- [x] PR contains only changes related; no stray files, etc.
- [x] README updated (where applicable)
- [x] Tests written (where applicable)
- [x] References provided in PR (where applicable)


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> Patch coverage: 100.00% of modified lines in pull request are covered.

<details><summary>Additional details and impacted files</summary>


```diff
@@            Coverage Diff            @@
##            master     #2189   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          106       106           
  Lines         2348      2359   +11     
  Branches       593       592    -1     
=========================================
+ Hits          2348      2359   +11     
```


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|---|---|---|
| [src/lib/isLocale.js](https://codecov.io/gh/validatorjs/validator.js/pull/2189?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=validatorjs#diff-c3JjL2xpYi9pc0xvY2FsZS5qcw==) | `100.00% <100.00%> (ø)` | |

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</details>

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Patch:
diff --git a/README.md b/README.md
index d75f15b..af22345 100644
--- a/README.md
+++ b/README.md
@@ -150,7 +150,7 @@ Validator                               | Description
 **isMagnetURI(str)**                      | check if the string is a [Magnet URI format][Magnet URI Format].
 **isMD5(str)**                          | check if the string is a MD5 hash.<br/><br/>Please note that you can also use the `isHash(str, 'md5')` function. Keep in mind that MD5 has some collision weaknesses compared to other algorithms (e.g., SHA).
 **isMimeType(str)**                     | check if the string matches to a valid [MIME type][MIME Type] format.
-**isMobilePhone(str [, locale [, options]])**          | check if the string is a mobile phone number,<br/><br/>`locale` is either an array of locales (e.g. `['sk-SK', 'sr-RS']`) OR one of `['am-Am', 'ar-AE', 'ar-BH', 'ar-DZ', 'ar-EG', 'ar-EH', 'ar-IQ', 'ar-JO', 'ar-KW', 'ar-PS', 'ar-SA', 'ar-SY', 'ar-TN', 'ar-YE', 'az-AZ', 'az-LB', 'az-LY', 'be-BY', 'bg-BG', 'bn-BD', 'bs-BA', 'ca-AD', 'cs-CZ', 'da-DK', 'de-AT', 'de-CH', 'de-DE', 'de-LU', 'dv-MV', 'dz-BT', 'el-CY', 'el-GR', 'en-AG', 'en-AI', 'en-AU', 'en-BM', 'en-BS', 'en-BW', 'en-CA', 'en-GB', 'en-GG', 'en-GH', 'en-GY', 'en-HK', 'en-IE', 'en-IN', 'en-JM', 'en-KE', 'en-KI', 'en-KN', 'en-LS', 'en-MO', 'en-MT', 'en-MU', 'en-NG', 'en-NZ', 'en-PG', 'en-PH', 'en-PK', 'en-RW', 'en-SG', 'en-SL', 'en-SS', 'en-TZ', 'en-UG', 'en-US', 'en-ZA', 'en-ZM', 'en-ZW', 'es-AR', 'es-BO', 'es-CL', 'es-CO', 'es-CR', 'es-CU', 'es-DO', 'es-EC', 'es-ES', 'es-HN', 'es-MX', 'es-NI', 'es-PA', 'es-PE', 'es-PY', 'es-SV', 'es-UY', 'es-VE', 'et-EE', 'fa-AF', 'fa-IR', 'fi-FI', 'fj-FJ', 'fo-FO', 'fr-BE', 'fr-BF', 'fr-BJ', 'fr-CD', 'fr-CF', 'fr-FR', 'fr-GF', 'fr-GP', 'fr-MQ', 'fr-PF', 'fr-RE', 'ga-IE', 'he-IL', 'hu-HU', 'id-ID', 'ir-IR', 'it-IT', 'it-SM', 'ja-JP', 'ka-GE', 'kk-KZ', 'kl-GL', 'ko-KR', 'ky-KG', 'lt-LT', 'mg-MG', 'mn-MN', 'ms-MY', 'my-MM', 'mz-MZ', 'nb-NO', 'ne-NP', 'nl-AW', 'nl-BE', 'nl-NL', 'nn-NO', 'pl-PL', 'pt-AO', 'pt-BR', 'pt-PT', 'ro-Md', 'ro-RO', 'ru-RU', 'si-LK', 'sk-SK', 'sl-SI', 'so-SO', 'sq-AL', 'sr-RS', 'sv-SE', 'tg-TJ', 'th-TH', 'tk-TM', 'tr-TR', 'uk-UA', 'uz-UZ', 'vi-VN', 'zh-CN', 'zh-HK', 'zh-MO', 'zh-TW']` OR defaults to `'any'`. If 'any' or a falsey value is used, function will check if any of the locales match).<br/><br/>`options` is an optional object that can be supplied with the following keys: `strictMode`, if this is set to `true`, the mobile phone number must be supplied with the country code and therefore must start with `+`. Locale list is `validator.isMobilePhoneLocales`.
+**isMobilePhone(str [, locale [, options]])**          | check if the string is a mobile phone number,<br/><br/>`locale` is either an array of locales (e.g. `['sk-SK', 'sr-RS']`) OR one of `['am-Am', 'ar-AE', 'ar-BH', 'ar-DZ', 'ar-EG', 'ar-EH', 'ar-IQ', 'ar-JO', 'ar-KW', 'ar-PS', 'ar-SA', 'ar-SY', 'ar-TN', 'ar-YE', 'az-AZ', 'az-LB', 'az-LY', 'be-BY', 'bg-BG', 'bn-BD', 'bs-BA', 'ca-AD', 'cs-CZ', 'da-DK', 'de-AT', 'de-CH', 'de-DE', 'de-LU', 'dv-MV', 'dz-BT', 'el-CY', 'el-GR', 'en-AG', 'en-AI', 'en-AU', 'en-BM', 'en-BS', 'en-BW', 'en-CA', 'en-GB', 'en-GG', 'en-GH', 'en-GY', 'en-HK', 'en-IE', 'en-IN', 'en-JM', 'en-KE', 'en-KI', 'en-KN', 'en-LS', 'en-MO', 'en-MT', 'en-MU', 'en-NG', 'en-NZ', 'en-PG', 'en-PH', 'en-PK', 'en-RW', 'en-SG', 'en-SL', 'en-SS', 'en-TZ', 'en-UG', 'en-US', 'en-ZA', 'en-ZM', 'en-ZW', 'es-AR', 'es-BO', 'es-CL', 'es-CO', 'es-CR', 'es-CU', 'es-DO', 'es-EC', 'es-ES', 'es-HN', 'es-MX', 'es-NI', 'es-PA', 'es-PE', 'es-PY', 'es-SV', 'es-UY', 'es-VE', 'et-EE', 'fa-AF', 'fa-IR', 'fi-FI', 'fj-FJ', 'fo-FO', 'fr-BE', 'fr-BF', 'fr-BJ', 'fr-CD', 'fr-CF', 'fr-FR', 'fr-GF', 'fr-GP', 'fr-MQ', 'fr-PF', 'fr-RE', 'fr-WF', 'ga-IE', 'he-IL', 'hu-HU', 'id-ID', 'ir-IR', 'it-IT', 'it-SM', 'ja-JP', 'ka-GE', 'kk-KZ', 'kl-GL', 'ko-KR', 'ky-KG', 'lt-LT', 'mg-MG', 'mn-MN', 'ms-MY', 'my-MM', 'mz-MZ', 'nb-NO', 'ne-NP', 'nl-AW', 'nl-BE', 'nl-NL', 'nn-NO', 'pl-PL', 'pt-AO', 'pt-BR', 'pt-PT', 'ro-Md', 'ro-RO', 'ru-RU', 'si-LK', 'sk-SK', 'sl-SI', 'so-SO', 'sq-AL', 'sr-RS', 'sv-SE', 'tg-TJ', 'th-TH', 'tk-TM', 'tr-TR', 'uk-UA', 'uz-UZ', 'vi-VN', 'zh-CN', 'zh-HK', 'zh-MO', 'zh-TW']` OR defaults to `'any'`. If 'any' or a falsey value is used, function will check if any of the locales match).<br/><br/>`options` is an optional object that can be supplied with the following keys: `strictMode`, if this is set to `true`, the mobile phone number must be supplied with the country code and therefore must start with `+`. Locale list is `validator.isMobilePhoneLocales`.
 **isMongoId(str)**                      | check if the string is a valid hex-encoded representation of a [MongoDB ObjectId][mongoid].
 **isMultibyte(str)**                    | check if the string contains one or more multibyte chars.
 **isNumeric(str [, options])**                      | check if the string contains only numbers.<br/><br/>`options` is an object which defaults to `{ no_symbols: false }` it also has `locale` as an option. If `no_symbols` is true, the validator will reject numeric strings that feature a symbol (e.g. `+`, `-`, or `.`).<br/><br/>`locale` determines the decimal separator and 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', 'en-AU', 'en-GB', 'en-HK', 'en-IN', 'en-NZ', 'en-US', 'en-ZA', 'en-ZM', 'es-ES', 'fr-FR', 'fr-CA', 'hu-HU', 'it-IT', 'nb-NO', 'nl-NL', 'nn-NO', 'pl-PL', 'pt-BR', 'pt-PT', 'ru-RU', 'sl-SI', 'sr-RS', 'sr-RS@latin', 'sv-SE', 'tr-TR', 'uk-UA']`.
diff --git a/src/lib/isLocale.js b/src/lib/isLocale.js
index cacac8a..ec84c8f 100644
--- a/src/lib/isLocale.js
+++ b/src/lib/isLocale.js
@@ -1,11 +1,111 @@
 import assertString from './util/assertString';
 
-const localeReg = /^[A-Za-z]{2,4}([_-]([A-Za-z]{4}|[\d]{3}))?([_-]([A-Za-z]{2}|[\d]{3}))?$/;
+/*
+  = 3ALPHA              ; selected ISO 639 codes
+    *2("-" 3ALPHA)      ; permanently reserved
+ */
+const extlang = '([A-Za-z]{3}(-[A-Za-z]{3}){0,2})';
+
+/*
+  = 2*3ALPHA            ; shortest ISO 639 code
+    ["-" extlang]       ; sometimes followed by
+                        ; extended language subtags
+  / 4ALPHA              ; or reserved for future use
+  / 5*8ALPHA            ; or registered language subtag
+ */
+const language = `(([a-zA-Z]{2,3}(-${extlang})?)|([a-zA-Z]{5,8}))`;
+
+/*
+  = 4ALPHA              ; ISO 15924 code
+ */
+const script = '([A-Za-z]{4})';
+
+/*
+  = 2ALPHA              ; ISO 3166-1 code
+  / 3DIGIT              ; UN M.49 code
+ */
+const region = '([A-Za-z]{2}|\\d{3})';
+
+/*
+  = 5*8alphanum         ; registered variants
+  / (DIGIT 3alphanum)
+ */
+const variant = '([A-Za-z0-9]{5,8}|(\\d[A-Z-a-z0-9]{3}))';
+
+/*
+  = DIGIT               ; 0 - 9
+  / %x41-57             ; A - W
+  / %x59-5A             ; Y - Z
+  / %x61-77             ; a - w
+  / %x79-7A             ; y - z
+ */
+const singleton = '(\\d|[A-W]|[Y-Z]|[a-w]|[y-z])';
+
+/*
+  = singleton 1*("-" (2*8alphanum))
+                        ; Single alphanumerics
+                        ; "x" reserved for private use
+ */
+const extension = `(${singleton}(-[A-Za-z0-9]{2,8})+)`;
+
+/*
+  = "x" 1*("-" (1*8alphanum))
+ */
+const privateuse = '(x(-[A-Za-z0-9]{1,8})+)';
+
+// irregular tags do not match the 'langtag' production and would not
+// otherwise be considered 'well-formed'. These tags are all valid, but
+// most are deprecated in favor of more modern subtags or subtag combination
+
+const irregular = '((en-GB-oed)|(i-ami)|(i-bnn)|(i-default)|(i-enochian)|' +
+    '(i-hak)|(i-klingon)|(i-lux)|(i-mingo)|(i-navajo)|(i-pwn)|(i-tao)|' +
+    '(i-tay)|(i-tsu)|(sgn-BE-FR)|(sgn-BE-NL)|(sgn-CH-DE))';
+
+// regular tags match the 'langtag' production, but their subtags are not
+// extended language or variant subtags: their meaning is defined by
+// their registration and all of these are deprecated in favor of a more
+// modern subtag or sequence of subtags
+
+const regular = '((art-lojban)|(cel-gaulish)|(no-bok)|(no-nyn)|(zh-guoyu)|' +
+    '(zh-hakka)|(zh-min)|(zh-min-nan)|(zh-xiang))';
+
+/*
+  = irregular           ; non-redundant tags registered
+  / regular             ; during the RFC 3066 era
+
+ */
+const grandfathered = `(${irregular}|${regular})`;
+
+/*
+  RFC 5646 defines delimitation of subtags via a hyphen:
+
+      "Subtag" refers to a specific section of a tag, delimited by a
+      hyphen, such as the subtags 'zh', 'Hant', and 'CN' in the tag "zh-
+      Hant-CN".  Examples of subtags in this document are enclosed in
+      single quotes ('Hant')
+
+  However, we need to add "_" to maintain the existing behaviour.
+ */
+const delimiter = '(-|_)';
+
+/*
+  = language
+    ["-" script]
+    ["-" region]
+    *("-" variant)
+    *("-" extension)
+    ["-" privateuse]
+ */
+const langtag = `${language}(${delimiter}${script})?(${delimiter}${region})?(${delimiter}${variant})*(${delimiter}${extension})*(${delimiter}${privateuse})?`;
+
+/*
+  Regex implementation based on BCP RFC 5646
+  Tags for Identifying Languages
+  https://www.rfc-editor.org/rfc/rfc5646.html
+ */
+const languageTagRegex = new RegExp(`(^${privateuse}$)|(^${grandfathered}$)|(^${langtag}$)`);
 
 export default function isLocale(str) {
   assertString(str);
-  if (str === 'en_US_POSIX' || str === 'ca_ES_VALENCIA') {
-    return true;
-  }
-  return localeReg.test(str);
+  return languageTagRegex.test(str);
 }
diff --git a/src/lib/isMobilePhone.js b/src/lib/isMobilePhone.js
index c6ded55..6a8f987 100644
--- a/src/lib/isMobilePhone.js
+++ b/src/lib/isMobilePhone.js
@@ -76,7 +76,7 @@ const phones = {
   'es-CO': /^(\+?57)?3(0(0|1|2|4|5)|1\d|2[0-4]|5(0|1))\d{7}$/,
   'es-CL': /^(\+?56|0)[2-9]\d{1}\d{7}$/,
   'es-CR': /^(\+506)?[2-8]\d{7}$/,
-  'es-CU': /^(\+53|0053)?5\d{7}/,
+  'es-CU': /^(\+53|0053)?5\d{7}$/,
   'es-DO': /^(\+?1)?8[024]9\d{7}$/,
   'es-HN': /^(\+?504)?[9|8|3|2]\d{7}$/,
   'es-EC': /^(\+?593|0)([2-7]|9[2-9])\d{7}$/,
@@ -104,6 +104,7 @@ const phones = {
   'fr-MQ': /^(\+?596|0|00596)[67]\d{8}$/,
   'fr-PF': /^(\+?689)?8[789]\d{6}$/,
   'fr-RE': /^(\+?262|0|00262)[67]\d{8}$/,
+  'fr-WF': /^(\+681)?\d{6}$/,
   'he-IL': /^(\+972|0)([23489]|5[012345689]|77)[1-9]\d{6}$/,
   'hu-HU': /^(\+?36|06)(20|30|31|50|70)\d{7}$/,
   'id-ID': /^(\+?62|0)8(1[123456789]|2[1238]|3[1238]|5[12356789]|7[78]|9[56789]|8[123456789])([\s?|\d]{5,11})$/,
diff --git a/src/lib/isVAT.js b/src/lib/isVAT.js
index 9559356..ece7d85 100644
--- a/src/lib/isVAT.js
+++ b/src/lib/isVAT.js
@@ -1,6 +1,21 @@
 import assertString from './util/assertString';
 import * as algorithms from './util/algorithms';
 
+const CH = (str) => {
+  // @see {@link https://www.ech.ch/de/ech/ech-0097/5.2.0}
+  const hasValidCheckNumber = (digits) => {
+    const lastDigit = digits.pop(); // used as check number
+    const weights = [5, 4, 3, 2, 7, 6, 5, 4];
+    const calculatedCheckNumber = (11 - (digits.reduce((acc, el, idx) =>
+      acc + (el * weights[idx]), 0) % 11)) % 11;
+
+    return lastDigit === calculatedCheckNumber;
+  };
+
+  // @see {@link https://www.estv.admin.ch/estv/de/home/mehrwertsteuer/uid/mwst-uid-nummer.html}
+  return /^(CHE[- ]?)?(\d{9}|(\d{3}\.\d{3}\.\d{3})|(\d{3} \d{3} \d{3})) ?(TVA|MWST|IVA)?$/.test(str) && hasValidCheckNumber((str.match(/\d/g).map(el => +el)));
+};
+
 const PT = (str) => {
   const match = str.match(/^(PT)?(\d{9})$/);
   if (!match) {
@@ -69,7 +84,7 @@ export const vatMatchers = {
   SM: str => /^(SM)?\d{5}$/.test(str),
   SA: str => /^(SA)?\d{15}$/.test(str),
   RS: str => /^(RS)?\d{9}$/.test(str),
-  CH: str => /^(CH)?(\d{6}|\d{9}|(\d{3}.\d{3})|(\d{3}.\d{3}.\d{3}))(TVA|MWST|IVA)$/.test(str),
+  CH,
   TR: str => /^(TR)?\d{10}$/.test(str),
   UA: str => /^(UA)?\d{12}$/.test(str),
   GB: str => /^GB((\d{3} \d{4} ([0-8][0-9]|9[0-6]))|(\d{9} \d{3})|(((GD[0-4])|(HA[5-9]))[0-9]{2}))$/.test(str),


Test patch:
diff --git a/test/validators.test.js b/test/validators.test.js
index 239f172..ad2ea70 100644
--- a/test/validators.test.js
+++ b/test/validators.test.js
@@ -4816,16 +4816,51 @@ describe('Validators', () => {
         'uz_Latn_UZ',
         'en',
         'gsw',
+        'en-US',
         'es_ES',
+        'es-419',
         'sw_KE',
         'am_ET',
+        'zh-CHS',
         'ca_ES_VALENCIA',
         'en_US_POSIX',
+        'hak-CN',
+        'zh-Hant',
+        'zh-Hans',
+        'sr-Cyrl',
+        'sr-Latn',
+        'zh-cmn-Hans-CN',
+        'cmn-Hans-CN',
+        'zh-yue-HK',
+        'yue-HK',
+        'zh-Hans-CN',
+        'sr-Latn-RS',
+        'sl-rozaj',
+        'sl-rozaj-biske',
+        'sl-nedis',
+        'de-CH-1901',
+        'sl-IT-nedis',
+        'hy-Latn-IT-arevela',
+        'i-enochian',
+        'en-scotland-fonipa',
+        'sl-IT-rozaj-biske-1994',
+        'de-CH-x-phonebk',
+        'az-Arab-x-AZE-derbend',
+        'x-whatever',
+        'qaa-Qaaa-QM-x-southern',
+        'de-Qaaa',
+        'sr-Latn-QM',
+        'sr-Qaaa-RS',
+        'en-US-u-islamcal',
+        'zh-CN-a-myext-x-private',
+        'en-a-myext-b-another',
       ],
       invalid: [
         'lo_POP',
         '12',
         '12_DD',
+        'de-419-DE',
+        'a-DE',
       ],
     });
   });
@@ -7764,6 +7799,32 @@ describe('Validators', () => {
           '6898912345',
         ],
       },
+      {
+        locale: 'fr-WF',
+        valid: [
+          '+681408500',
+          '+681499387',
+          '+681728590',
+          '+681808542',
+          '+681828540',
+          '+681832014',
+          '408500',
+          '499387',
+          '728590',
+          '808542',
+          '828540',
+          '832014',
+        ],
+        invalid: [
+          '+68189032',
+          '123456789',
+          '+681723845987',
+          '022452389',
+          '+681772345678',
+          '+681700456794',
+
+        ],
+      },
       {
         locale: 'ka-GE',
         valid: [
@@ -8296,6 +8357,7 @@ describe('Validators', () => {
           '',
           'abc',
           '+535123457',
+          '56043029304',
         ],
       },
       {
@@ -13864,18 +13926,30 @@ describe('Validators', () => {
       validator: 'isVAT',
       args: ['CH'],
       valid: [
-        'CH123456TVA',
-        '123456TVA',
-        'CH123456789MWST',
-        '123456789MWST',
-        'CH123.456IVA',
-        '123.456IVA',
-        'CH123.456.789TVA',
-        '123.456.789TVA',
-      ],
-      invalid: [
-        'CH 123456',
-        '12345',
+        // strictly valid
+        'CHE-116.281.710 MWST',
+        'CHE-116.281.710 IVA',
+        'CHE-116.281.710 TVA',
+        // loosely valid presentation variants
+        'CHE 116 281 710 IVA', // all separators are spaces
+        'CHE-191.398.369MWST', // no space before suffix
+        'CHE-116281710 MWST', // no number separators
+        'CHE-116281710MWST', // no number separators and no space before suffix
+        'CHE105854263MWST', // no separators
+        'CHE-116.285.524', // no suffix (vat abbreviation)
+        'CHE116281710', // no suffix and separators
+        '116.281.710 TVA', // no prefix (CHE, ISO-3166-1 Alpha-3)
+        '116281710MWST', // no prefix and separators
+        '100.218.485', // no prefix and suffix
+        '123456788', // no prefix, separators and suffix
+      ],
+      invalid: [
+        'CH-116.281.710 MWST', // invalid prefix (should be CHE)
+        'CHE-116.281 MWST', // invalid number of digits (should be 9)
+        'CHE-123.456.789 MWST', // invalid last digit (should match the calculated check-number 8)
+        'CHE-123.356.780 MWST', // invalid check-number (there are no swiss UIDs with the calculated check number 10)
+        'CH-116.281.710 VAT', // invalid suffix (should be MWST, IVA or TVA)
+        'CHE-116/281/710 IVA', // invalid number separators (should be all dots or all spaces)
       ],
     });
     test({