add mail type and validation

src/helpers/convertHelper.ts

@@ -60,6 +60,41 @@ export abstract class MsTypeConverter extends TypeConverter<ms.StringValue> {
   }
 }
 
+export abstract class EmailTypeConverter extends TypeConverter<string> {
+  fromString(value: string): string {
+    return value;
+  }
+  toString(value: string): string {
+    return value;
+  }
+  validate(value: string): boolean {
+    var tester =
+      /^[-!#$%&'*+\/0-9=?A-Z^_a-z`{|}~](\.?[-!#$%&'*+\/0-9=?A-Z^_a-z`{|}~])*@[a-zA-Z0-9](-*\.?[a-zA-Z0-9])*\.[a-zA-Z](-?[a-zA-Z0-9])+$/;
+    if (!value) return false;
+
+    var emailParts = value.split("@");
+
+    if (emailParts.length !== 2) return false;
+
+    var account = emailParts[0];
+    var address = emailParts[1];
+
+    if (account.length > 64) return false;
+    else if (address.length > 255) return false;
+
+    var domainParts = address.split(".");
+
+    if (
+      domainParts.some(function (part) {
+        return part.length > 63;
+      })
+    )
+      return false;
+
+    return tester.test(value);
+  }
+}
+
 // Konkrete Implementierungen der Converter
 export class StringConverter extends StringTypeConverter {}
 export class LongStringConverter extends StringTypeConverter {}
@@ -67,3 +102,4 @@ export class UrlConverter extends StringTypeConverter {}
 export class NumberConverter extends NumberTypeConverter {}
 export class BooleanConverter extends BooleanTypeConverter {}
 export class MsConverter extends MsTypeConverter {}
+export class EmailConverter extends EmailTypeConverter {}