feat: add isDuration validator

README.md

@@ -105,6 +105,7 @@ Validator                               | Description
 **isDate(str [, options])**          | check if the string is a valid date. e.g. [`2002-07-15`, new Date()].<br/><br/> `options` is an object which can contain the keys `format`, `strictMode` and/or `delimiters`.<br/><br/>`format` is a string and defaults to `YYYY/MM/DD`.<br/><br/>`strictMode` is a boolean and defaults to `false`. If `strictMode` is set to true, the validator will reject strings different from `format`.<br/><br/> `delimiters` is an array of allowed date delimiters and defaults to `['/', '-']`.
 **isDecimal(str [, options])**             | check if the string represents a decimal number, such as 0.1, .3, 1.1, 1.00003, 4.0, etc.<br/><br/>`options` is an object which defaults to `{force_decimal: false, decimal_digits: '1,', locale: 'en-US'}`.<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', 'el-GR', 'en-AU', 'en-GB', 'en-HK', 'en-IN', 'en-NZ', 'en-US', 'en-ZA', 'en-ZM', 'eo', 'es-ES', 'fa', 'fa-AF', 'fa-IR', 'fr-FR', 'fr-CA', 'hu-HU', 'id-ID', 'it-IT', 'ku-IQ', 'nb-NO', 'nl-NL', 'nn-NO', 'pl-PL', 'pl-Pl', 'pt-BR', 'pt-PT', 'ru-RU', 'sl-SI', 'sr-RS', 'sr-RS@latin', 'sv-SE', 'tr-TR', 'uk-UA', 'vi-VN']`.<br/>**Note:** `decimal_digits` is given as a range like '1,3', a specific value like '3' or min like '1,'.
 **isDivisibleBy(str, number)**          | check if the string is a number that is divisible by another.
+**isDuration(str)**                     | check if the string is a valid duration. e.g. [`1 week`, `2 days`, `1h`, `30m`, `15 s`].<br/><br/>It is designed to match the format used by the [ms](https://github.com/vercel/ms) package.
 **isEAN(str)**                          | check if the string is an [EAN (European Article Number)][European Article Number].
 **isEmail(str [, options])**            | check if the string is an email.<br/><br/>`options` is an object which defaults to `{ allow_display_name: false, require_display_name: false, allow_utf8_local_part: true, require_tld: true, allow_ip_domain: false, allow_underscores: false, domain_specific_validation: false, blacklisted_chars: '', host_blacklist: [] }`. If `allow_display_name` is set to true, the validator will also match `Display Name <email-address>`. If `require_display_name` is set to true, the validator will reject strings without the format `Display Name <email-address>`. If `allow_utf8_local_part` is set to false, the validator will not allow any non-English UTF8 character in email address' local part. If `require_tld` is set to false, email addresses without a TLD in their domain will also be matched. If `ignore_max_length` is set to true, the validator will not check for the standard max length of an email. If `allow_ip_domain` is set to true, the validator will allow IP addresses in the host part. If `domain_specific_validation` is true, some additional validation will be enabled, e.g. disallowing certain syntactically valid email addresses that are rejected by Gmail. If `blacklisted_chars` receives a string, then the validator will reject emails that include any of the characters in the string, in the name part. If `host_blacklist` is set to an array of strings or regexp, and the part of the email after the `@` symbol matches one of the strings defined in it, the validation fails. If `host_whitelist` is set to an array of strings or regexp, and the part of the email after the `@` symbol matches none of the strings defined in it, the validation fails.
 **isEmpty(str [, options])**            | check if the string has a length of zero.<br/><br/>`options` is an object which defaults to `{ ignore_whitespace: false }`.

src/index.js

@@ -14,6 +14,7 @@ import isIPRange from './lib/isIPRange';
 import isFQDN from './lib/isFQDN';
 import isDate from './lib/isDate';
 import isTime from './lib/isTime';
+import isDuration from './lib/isDuration';
 
 import isBoolean from './lib/isBoolean';
 import isLocale from './lib/isLocale';
@@ -245,6 +246,7 @@ const validator = {
   isLicensePlate,
   isVAT,
   ibanLocales,
+  isDuration,
 };
 
 export default validator;

src/lib/isDuration.js

@@ -0,0 +1,60 @@
+import assertString from './util/assertString';
+
+const BaseDurationUnits = [
+  'Years',
+  'Year',
+  'Yrs',
+  'Yr',
+  'Y',
+  'Weeks',
+  'Week',
+  'W',
+  'Days',
+  'Day',
+  'D',
+  'Hours',
+  'Hour',
+  'Hrs',
+  'Hr',
+  'H',
+  'Minutes',
+  'Minute',
+  'Mins',
+  'Min',
+  'M',
+  'Seconds',
+  'Second',
+  'Secs',
+  'Sec',
+  's',
+  'Milliseconds',
+  'Millisecond',
+  'Msecs',
+  'Msec',
+  'Ms',
+];
+
+const AllDurationUnits = new Set(BaseDurationUnits.reduce((acc, unit) => acc.concat([
+  unit, unit.toUpperCase(), unit.toLowerCase()]), []));
+
+/**
+ * Checks if the string is a valid duration.
+ * It is designed to match the format used by the [ms](https://github.com/vercel/ms) package.
+ * The duration can be "1 week","2 days","1h", "30m", "15 s", etc.
+ */
+export default function isDuration(value) {
+  assertString(value);
+
+  // Match number (integer or decimal) optionally followed by a unit
+  // Supports: "1", "1.5", ".5", "-1", "-1.5", "-.5", "1h", "1.5 hours", etc.
+  // Using indexed capture groups for Node.js <10 compatibility
+  const match = value.match(/^(-?(?:\d+(?:\.\d+)?|\.\d+))(?:\s?([a-zA-Z]+))?$/);
+
+  if (!match) {
+    return false;
+  }
+
+  const unit = match[2];
+
+  return unit === undefined || AllDurationUnits.has(unit);
+}

test/validators/isDuration.test.js

@@ -0,0 +1,44 @@
+import { describe } from 'mocha';
+import test from '../testFunctions';
+
+describe('isDuration', () => {
+  it('should validate duration strings', () => {
+    test({
+      validator: 'isDuration',
+      valid: [
+        '1 week',
+        '2 days',
+        '1h',
+        '30m',
+        '15 s',
+        '100ms',
+        '1.5h',
+        '2.5 weeks',
+        '-1d',
+        '-200',
+      ],
+      invalid: [
+        '',
+        'abc',
+        '1 invalid',
+        'week 1',
+        '1.2.3h',
+        '+1h', // plus sign is not allowed as in `ms` package
+        '+200', // plus sign is not allowed as in `ms` package
+      ],
+    });
+  });
+
+  it('should accept various unit formats', () => {
+    test({
+      validator: 'isDuration',
+      valid: [
+        '1 Year',
+        '2 WEEKS',
+        '3 days',
+        '4H',
+        '5m',
+      ],
+    });
+  });
+});