Adding TaxId validation for Argentina

README.md

@@ -167,7 +167,7 @@ Validator                               | Description
 **isSlug(str)**                         | check if the string is of type slug.
 **isStrongPassword(str [, options])**   | check if the string can be considered a strong password or not. Allows for custom requirements or scoring rules. If `returnScore` is true, then the function returns an integer score for the password rather than a boolean.<br/>Default options: <br/>`{ minLength: 8, minLowercase: 1, minUppercase: 1, minNumbers: 1, minSymbols: 1, returnScore: false, pointsPerUnique: 1, pointsPerRepeat: 0.5, pointsForContainingLower: 10, pointsForContainingUpper: 10, pointsForContainingNumber: 10, pointsForContainingSymbol: 10 }`
 **isTime(str [, options])**             | check if the string is a valid time e.g. [`23:01:59`, new Date().toLocaleTimeString()].<br/><br/> `options` is an object which can contain the keys `hourFormat` or `mode`.<br/><br/>`hourFormat` is a key and defaults to `'hour24'`.<br/><br/>`mode` is a key and defaults to `'default'`. <br/><br/>`hourFomat` can contain the values `'hour12'` or `'hour24'`, `'hour24'` will validate hours in 24 format and `'hour12'` will validate hours in 12 format. <br/><br/>`mode` can contain the values `'default'` or `'withSeconds'`, `'default'` will validate `HH:MM` format, `'withSeconds'` will validate the `HH:MM:SS` format.
-**isTaxID(str, locale)**                | check if the string is a valid Tax Identification Number. Default locale is `en-US`.<br/><br/>More info about exact TIN support can be found in `src/lib/isTaxID.js`.<br/><br/>Supported locales: `[ 'bg-BG', 'cs-CZ', 'de-AT', 'de-DE', 'dk-DK', 'el-CY', 'el-GR', 'en-CA', 'en-GB', 'en-IE', 'en-US', 'es-ES', 'et-EE', 'fi-FI', 'fr-BE', 'fr-CA', 'fr-FR', 'fr-LU', 'hr-HR', 'hu-HU', 'it-IT', 'lb-LU', 'lt-LT', 'lv-LV', 'mt-MT', 'nl-BE', 'nl-NL', 'pl-PL', 'pt-BR', 'pt-PT', 'ro-RO', 'sk-SK', 'sl-SI', 'sv-SE' ]`.
+**isTaxID(str, locale)**                | check if the string is a valid Tax Identification Number. Default locale is `en-US`.<br/><br/>More info about exact TIN support can be found in `src/lib/isTaxID.js`.<br/><br/>Supported locales: `[ 'bg-BG', 'cs-CZ', 'de-AT', 'de-DE', 'dk-DK', 'el-CY', 'el-GR', 'en-CA', 'en-GB', 'en-IE', 'en-US', 'es-AR', 'es-ES', 'et-EE', 'fi-FI', 'fr-BE', 'fr-CA', 'fr-FR', 'fr-LU', 'hr-HR', 'hu-HU', 'it-IT', 'lb-LU', 'lt-LT', 'lv-LV', 'mt-MT', 'nl-BE', 'nl-NL', 'pl-PL', 'pt-BR', 'pt-PT', 'ro-RO', 'sk-SK', 'sl-SI', 'sv-SE' ]`.
 **isURL(str [, options])**              | check if the string is a URL.<br/><br/>`options` is an object which defaults to `{ protocols: ['http','https','ftp'], require_tld: true, require_protocol: false, require_host: true, require_port: false, require_valid_protocol: true, allow_underscores: false, host_whitelist: false, host_blacklist: false, allow_trailing_dot: false, allow_protocol_relative_urls: false, allow_fragments: true, allow_query_components: true, disallow_auth: false, validate_length: true }`.<br/><br/>`require_protocol` - if set to true isURL will return false if protocol is not present in the URL.<br/>`require_valid_protocol` - isURL will check if the URL's protocol is present in the protocols option.<br/>`protocols` - valid protocols can be modified with this option.<br/>`require_host` - if set to false isURL will not check if host is present in the URL.<br/>`require_port` - if set to true isURL will check if port is present in the URL.<br/>`allow_protocol_relative_urls` - if set to true protocol relative URLs will be allowed.<br/>`allow_fragments` - if set to false isURL will return false if fragments are present.<br/>`allow_query_components` - if set to false isURL will return false if query components are present.<br/>`validate_length` - if set to false isURL will skip string length validation (2083 characters is IE max URL length).
 **isUUID(str [, version])**             | check if the string is a UUID (version 1, 2, 3, 4 or 5).
 **isVariableWidth(str)**                | check if the string contains a mixture of full and half-width chars.

src/lib/isTaxID.js

@@ -376,6 +376,30 @@ function enUsCheck(tin) {
   return enUsGetPrefixes().indexOf(tin.slice(0, 2)) !== -1;
 }
 
+/*
+ * es-AR validation function
+ * Clave Única de Identificación Tributaria (CUIT/CUIL)
+ * Sourced from:
+ * - https://servicioscf.afip.gob.ar/publico/abc/ABCpaso2.aspx?id_nivel1=3036&id_nivel2=3040&p=Conceptos%20b%C3%A1sicos
+ * - https://es.wikipedia.org/wiki/Clave_%C3%9Anica_de_Identificaci%C3%B3n_Tributaria
+ */
+
+function esArCheck(tin) {
+  let accum = 0;
+  let digits = tin.split('');
+  let digit = parseInt(digits.pop(), 10);
+  for (let i = 0; i < digits.length; i++) {
+    accum += digits[9 - i] * (2 + (i % 6));
+  }
+  let verif = 11 - (accum % 11);
+  if (verif === 11) {
+    verif = 0;
+  } else if (verif === 10) {
+    verif = 9;
+  }
+  return digit === verif;
+}
+
 /*
  * es-ES validation function
  * (Documento Nacional de Identidad (DNI)
@@ -1137,6 +1161,7 @@ const taxIdFormat = {
   'en-GB': /^\d{10}$|^(?!GB|NK|TN|ZZ)(?![DFIQUV])[A-Z](?![DFIQUVO])[A-Z]\d{6}[ABCD ]$/i,
   'en-IE': /^\d{7}[A-W][A-IW]{0,1}$/i,
   'en-US': /^\d{2}[- ]{0,1}\d{7}$/,
+  'es-AR': /(20|23|24|27|30|33|34)[0-9]{8}[0-9]/,
   'es-ES': /^(\d{0,8}|[XYZKLM]\d{7})[A-HJ-NP-TV-Z]$/i,
   'et-EE': /^[1-6]\d{6}(00[1-9]|0[1-9][0-9]|[1-6][0-9]{2}|70[0-9]|710)\d$/,
   'fi-FI': /^\d{6}[-+A]\d{3}[0-9A-FHJ-NPR-Y]$/i,
@@ -1175,6 +1200,7 @@ const taxIdCheck = {
   'en-CA': isCanadianSIN,
   'en-IE': enIeCheck,
   'en-US': enUsCheck,
+  'es-AR': esArCheck,
   'es-ES': esEsCheck,
   'et-EE': etEeCheck,
   'fi-FI': fiFiCheck,

test/validators.test.js

@@ -12321,6 +12321,27 @@ describe('Validators', () => {
         '28-1234567',
         '96-1234567'],
     });
+    test({
+      validator: 'isTaxID',
+      args: ['es-AR'],
+      valid: [
+        '20271633638',
+        '23274986069',
+        '27333234519',
+        '30678561165',
+        '33693450239',
+        '30534868460',
+        '23111111129',
+        '34557619099'],
+      invalid: [
+        '20-27163363-8',
+        '20.27163363.8',
+        '33693450231',
+        '69345023',
+        '693450233123123',
+        '3369ew50231',
+        '34557619095'],
+    });
     test({
       validator: 'isTaxID',
       args: ['es-ES'],