new validator: isMailtoURI, validate the mailto link URI format

README.md

@@ -148,6 +148,7 @@ Validator                               | Description
 **isLuhnNumber(str)**                    | check if the string passes the [Luhn algorithm check](https://en.wikipedia.org/wiki/Luhn_algorithm).
 **isMACAddress(str [, options])**                   | check if the string is a MAC address.<br/><br/>`options` is an object which defaults to `{ no_separators: false }`. If `no_separators` is true, the validator will allow MAC addresses without separators. Also, it allows the use of hyphens, spaces or dots e.g. '01 02 03 04 05 ab', '01-02-03-04-05-ab' or '0102.0304.05ab'. The options also allow a `eui` property to specify if it needs to be validated against EUI-48 or EUI-64. The accepted values of `eui` are: 48, 64.
 **isMagnetURI(str)**                      | check if the string is a [Magnet URI format][Magnet URI Format].
+**isMailtoURI(str, [, options])**                      | check if the string is a [Magnet URI format][Mailto URI Format].<br/><br/>`options` is an object of validating emails inside the URI (check `isEmail`s options for details).
 **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`.
@@ -301,6 +302,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 [ISSN]: https://en.wikipedia.org/wiki/International_Standard_Serial_Number
 [Luhn Check]: https://en.wikipedia.org/wiki/Luhn_algorithm
 [Magnet URI Format]: https://en.wikipedia.org/wiki/Magnet_URI_scheme
+[Mailto URI Format]: https://en.wikipedia.org/wiki/Mailto
 [MIME Type]: https://en.wikipedia.org/wiki/Media_type
 [mongoid]: http://docs.mongodb.org/manual/reference/object-id/
 [RFC 3339]: https://tools.ietf.org/html/rfc3339

src/index.js

@@ -101,6 +101,7 @@ import isBase58 from './lib/isBase58';
 import isBase64 from './lib/isBase64';
 import isDataURI from './lib/isDataURI';
 import isMagnetURI from './lib/isMagnetURI';
+import isMailtoURI from './lib/isMailtoURI';
 
 import isMimeType from './lib/isMimeType';
 
@@ -213,6 +214,7 @@ const validator = {
   isBase64,
   isDataURI,
   isMagnetURI,
+  isMailtoURI,
   isMimeType,
   isLatLong,
   ltrim,

src/lib/isMailtoURI.js

@@ -0,0 +1,67 @@
+import trim from './trim';
+import isEmail from './isEmail';
+import assertString from './util/assertString';
+
+function parseMailtoQueryString(queryString) {
+  const allowedParams = new Set(['subject', 'body', 'cc', 'bcc']),
+    query = { cc: '', bcc: '' };
+  let isParseFailed = false;
+
+  const queryParams = queryString.split('&');
+
+  if (queryParams.length > 4) {
+    return false;
+  }
+
+  for (const q of queryParams) {
+    const [key, value] = q.split('=');
+
+    // checked for invalid and duplicated query params
+    if (key && !allowedParams.has(key)) {
+      isParseFailed = true;
+      break;
+    }
+
+    if (value && (key === 'cc' || key === 'bcc')) {
+      query[key] = value;
+    }
+
+    if (key) {
+      allowedParams.delete(key);
+    }
+  }
+
+  return isParseFailed ? false : query;
+}
+
+export default function isMailtoURI(url, options) {
+  assertString(url);
+
+  if (url.indexOf('mailto:') !== 0) {
+    return false;
+  }
+
+  const [to = '', queryString = ''] = url.replace('mailto:', '').split('?');
+
+  if (!to && !queryString) {
+    return true;
+  }
+
+  const query = parseMailtoQueryString(queryString);
+
+  if (!query) {
+    return false;
+  }
+
+  return `${to},${query.cc},${query.bcc}`
+    .split(',')
+    .every((email) => {
+      email = trim(email, ' ');
+
+      if (email) {
+        return isEmail(email, options);
+      }
+
+      return true;
+    });
+}

test/validators.test.js

@@ -14179,4 +14179,55 @@ describe('Validators', () => {
       ],
     });
   });
+  it('should validate mailto URI', () => {
+    test({
+      validator: 'isMailtoURI',
+      valid: [
+        'mailto:?subject=something&[email protected]',
+        'mailto:?subject=something&[email protected],[email protected],',
+        'mailto:?subject=something&[email protected]',
+        'mailto:?subject=something&[email protected],[email protected]',
+        'mailto:[email protected],[email protected]',
+        'mailto:[email protected],[email protected]',
+        'mailto:[email protected]',
+        'mailto:[email protected]',
+        'mailto:?subject=something&body=something else',
+        'mailto:?subject=something&body=something else&[email protected],[email protected]',
+        'mailto:?subject=something&body=something else&[email protected],[email protected]',
+        'mailto:?subject=something&body=something else&[email protected]&[email protected],[email protected]',
+        'mailto:[email protected]',
+        'mailto:[email protected]?',
+        'mailto:[email protected]?subject=something',
+        'mailto:[email protected]?subject=something&[email protected]',
+        'mailto:[email protected]?subject=something&[email protected],[email protected],',
+        'mailto:[email protected]?subject=something&[email protected]',
+        'mailto:[email protected]?subject=something&[email protected],[email protected]',
+        'mailto:[email protected][email protected],[email protected]',
+        'mailto:[email protected][email protected],[email protected]',
+        'mailto:[email protected][email protected]',
+        'mailto:[email protected][email protected]&',
+        'mailto:[email protected]?subject=something&body=something else',
+        'mailto:[email protected]?subject=something&body=something else&[email protected],[email protected]',
+        'mailto:[email protected]?subject=something&body=something else&[email protected],[email protected]',
+        'mailto:[email protected]?subject=something&body=something else&[email protected]&[email protected],[email protected]',
+        'mailto:',
+      ],
+      invalid: [
+        '',
+        'somthing',
+        '[email protected]',
+        'mailto:?subject=okay&subject=444',
+        'mailto:?subject=something&wrong=888',
+        'mailto:somename@ｇｍａｉｌ.com',
+        'mailto:[email protected]?cc=somename@ｇｍａｉｌ.com',
+        'mailto:[email protected]?bcc=somename@ｇｍａｉｌ.com',
+        'mailto:[email protected]?bcc=somename@ｇｍａｉｌ.com&bcc',
+        'mailto:[email protected]?subject=anything&body=nothing&cc=&bcc=&key=',
+        'mailto:[email protected]?cc=somename',
+        'mailto:somename',
+        'mailto:[email protected]?subject=something&body=something else&[email protected]&[email protected],[email protected]&',
+        'mailto:?subject=something&body=something else&[email protected]&[email protected],[email protected]&',
+      ],
+    });
+  });
 });