DPM/ThirtPartyKlassen/MsgReaderCore/Helpers/EmailAddress.cs

//
// EmailAddress.cs
//
// Author: Kees van Spelde <sicos2002@hotmail.com>
//
// Copyright (c) 2013-2018 Magic-Sessions. (www.magic-sessions.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NON INFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

using System.Text.RegularExpressions;

namespace MsgReader.Helpers
{
    /// <summary>
    /// This class contains helper methods for E-mail addresses
    /// </summary>
    internal static class EmailAddress
    {
        private static readonly Regex EmailRegex = new Regex(@"\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*", RegexOptions.IgnoreCase | RegexOptions.Compiled);

        #region IsEmailAddressValid
        /// <summary>
        /// Return true when the E-mail address is valid
        /// </summary>
        /// <param name="emailAddress"></param>
        /// <returns></returns>
        public static bool IsEmailAddressValid(string emailAddress)
        {
            if (string.IsNullOrEmpty(emailAddress))
                return false;

            var matches = EmailRegex.Matches(emailAddress);

            return matches.Count == 1;
        }
        #endregion

        public static string GetValidEmailAddress(string value)
        {
            if (string.IsNullOrEmpty(value))
                return null;

            var matches = EmailRegex.Matches(value);

            if (matches.Count != 1)
                return null;

            return matches[0].Value;
        }

        #region RemoveSingleQuotes
        /// <summary>
        /// Removes trailing en ending single quotes from an E-mail address when they exist
        /// </summary>
        /// <param name="email"></param>
        /// <returns></returns>
        public static string RemoveSingleQuotes(string email)
        {
            if (string.IsNullOrEmpty(email))
                return string.Empty;

            if (email.StartsWith("'"))
                email = email.Substring(1, email.Length - 1);

            if (email.EndsWith("'"))
                email = email.Substring(0, email.Length - 1);

            return email;
        }
        #endregion
    }
}