Fix(isEmail): Added support for internationalized domain names

src/lib/isEmail.js

@@ -10,6 +10,7 @@ const default_email_options = {
   allow_underscores: false,
   require_display_name: false,
   allow_utf8_local_part: true,
+  allow_idn: true,
   require_tld: true,
   blacklisted_chars: '',
   ignore_max_length: false,
@@ -144,6 +145,7 @@ export default function isEmail(str, options) {
     require_tld: options.require_tld,
     ignore_max_length: options.ignore_max_length,
     allow_underscores: options.allow_underscores,
+    allow_idn: options.allow_idn,
   })) {
     if (!options.allow_ip_domain) {
       return false;

src/lib/isFQDN.js

@@ -7,6 +7,7 @@ const default_fqdn_options = {
   allow_trailing_dot: false,
   allow_numeric_tld: false,
   allow_wildcard: false,
+  allow_idn: true,
   ignore_max_length: false,
 };
 
@@ -71,6 +72,11 @@ export default function isFQDN(str, options) {
       return false;
     }
 
+    // verify if domain is IDN
+    if (!options.allow_idn && !/^[a-z0-9-_]+$/i.test(part)) {
+      return false;
+    }
+
     return true;
   });
 }

test/validators.test.js

@@ -140,6 +140,29 @@ describe('Validators', () => {
     });
   });
 
+  it('should not validate email addresses with non-ASCII domain names if allow_idn is set to false', () => {
+    test({
+      validator: 'isEmail',
+      args: [{ allow_idn: false }],
+      valid: [],
+      invalid: [
+        'ka25maj@gˇmail.com',
+        'i18n@exampلe.com',
+        'i18n@EXАМПЛЕ.com',
+        'i18n@exамple.com',
+        'i18n@éxample.com',
+        'i18n@eßample.com',
+        'i18n@EXΑΜΠΛΕ.com',
+        'i18n@exαmple.com',
+        'i18n@exampłe.com',
+        'i18n@eซample.com',
+        'i18n@例題.com',
+        'i18n@例え.com',
+        'i18n@사례.com',
+      ],
+    });
+  });
+
   it('should validate email addresses with display names', () => {
     test({
       validator: 'isEmail',
@@ -828,6 +851,29 @@ describe('Validators', () => {
     });
   });
 
+  it('should not validate URLs with non-ASCII domain names if allow_idn is set to false', () => {
+    test({
+      validator: 'isURL',
+      args: [{ allow_idn: false }],
+      valid: [],
+      invalid: [
+        'gˇmail.com',
+        'exampلe.com',
+        'EXАМПЛЕ.com',
+        'exамple.com',
+        'éxample.com',
+        'eßample.com',
+        'EXΑΜΠΛΕ.com',
+        'exαmple.com',
+        'exampłe.com',
+        'eซample.com',
+        '例題.com',
+        '例え.com',
+        '사례.com',
+      ],
+    });
+  });
+
   it('should validate MAC addresses', () => {
     test({
       validator: 'isMACAddress',