DocSpace-client/common/ASC.ActiveDirectory/LdapUtils.cs

/*
 *
 * (c) Copyright Ascensio System Limited 2010-2021
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
*/


using System.Text;
using System.Text.RegularExpressions;

using ASC.ActiveDirectory.Base.Data;
using ASC.Common.Logging;
using ASC.Core.Users;


namespace ASC.ActiveDirectory
{
    public static class LdapUtils
    {
        private static readonly Regex DcRegex = new Regex("dc=([^,]+)", RegexOptions.Compiled | RegexOptions.CultureInvariant | RegexOptions.IgnoreCase);

        public static string DistinguishedNameToDomain(string distinguishedName)
        {
            if (string.IsNullOrEmpty(distinguishedName))
                return null;

            var matchList = DcRegex.Matches(distinguishedName);

            var dcList = matchList.Cast<Match>().Select(match => match.Groups[1].Value).ToList();

            return !dcList.Any() ? null : string.Join(".", dcList);
        }

        public static bool IsLoginAccepted(LdapLogin ldapLogin, UserInfo ldapUser, string ldapDomain)
        {
            if (ldapLogin == null
                || string.IsNullOrEmpty(ldapLogin.ToString())
                || string.IsNullOrEmpty(ldapDomain)
                || ldapUser == null
                || ldapUser.Equals(Constants.LostUser)
                || string.IsNullOrEmpty(ldapUser.Email)
                || string.IsNullOrEmpty(ldapUser.UserName))
            {
                return false;
            }

            var hasDomain = !string.IsNullOrEmpty(ldapLogin.Domain);

            if (!hasDomain)
            {
                return ldapLogin.Username.Equals(ldapUser.UserName, StringComparison.InvariantCultureIgnoreCase);
            }

            var fullLogin = ldapLogin.ToString();

            if (fullLogin.Equals(ldapUser.Email, StringComparison.InvariantCultureIgnoreCase))
                return true;

            if (!ldapDomain.StartsWith(ldapLogin.Domain))
                return false;

            var alterEmail = ldapUser.UserName.Contains("@")
                ? ldapUser.UserName
                : string.Format("{0}@{1}", ldapUser.UserName, ldapDomain);

            return IsLoginAndEmailSuitable(fullLogin, alterEmail);
        }

        private static string GetLdapAccessableEmail(string email)
        {
            try
            {
                if (string.IsNullOrEmpty(email))
                    return null;

                var login = LdapLogin.ParseLogin(email);

                if (string.IsNullOrEmpty(login.Domain))
                    return email;

                var dotIndex = login.Domain.LastIndexOf(".", StringComparison.Ordinal);

                var accessableEmail = dotIndex > -1 ? string.Format("{0}@{1}", login.Username, login.Domain.Remove(dotIndex)) : email;

                return accessableEmail;
            }
            catch (Exception)
            {
                return null;
            }
        }

        private static bool IsLoginAndEmailSuitable(string login, string email)
        {
            try
            {
                if (string.IsNullOrEmpty(login) || string.IsNullOrEmpty(email))
                    return false;

                var accessableLogin = GetLdapAccessableEmail(login);

                if (string.IsNullOrEmpty(accessableLogin))
                    return false;

                var accessableEmail = GetLdapAccessableEmail(email);

                if (string.IsNullOrEmpty(accessableEmail))
                    return false;

                return accessableLogin.Equals(accessableEmail, StringComparison.InvariantCultureIgnoreCase);
            }
            catch (Exception)
            {
                return false;
            }
        }

        public static string GeneratePassword()
        {
            return Guid.NewGuid().ToString();
        }

        public static void SkipErrors(Action method, ILog log = null)
        {
            try
            {
                method();
            }
            catch (Exception ex)
            {
                if (log != null)
                    log.ErrorFormat("SkipErrors() failed. Error: {0}", ex);
            }
        }

        public static string GetContactsString(this UserInfo userInfo)
        {
            if (userInfo.ContactsList.Count == 0) return null;
            var sBuilder = new StringBuilder();
            foreach (var contact in userInfo.Contacts)
            {
                sBuilder.AppendFormat("{0}|", contact);
            }
            return sBuilder.ToString();
        }

        public static string GetUserInfoString(this UserInfo userInfo)
        {
            return string.Format(
                "{{ ID: '{0}' SID: '{1}' Email '{2}' UserName: '{3}' FirstName: '{4}' LastName: '{5}' Title: '{6}' Location: '{7}' Contacts: '{8}' Status: '{9}' }}",
                userInfo.ID,
                userInfo.Sid,
                userInfo.Email,
                userInfo.UserName,
                userInfo.FirstName,
                userInfo.LastName,
                userInfo.Title,
                userInfo.Location,
                userInfo.GetContactsString(),
                Enum.GetName(typeof(EmployeeStatus), userInfo.Status));
        }

        public static string UnescapeLdapString(string ldapString)
        {
            var sb = new StringBuilder();
            for (var i = 0; i < ldapString.Length; i++)
            {
                var ch = ldapString[i];
                if (ch == '\\')
                {
                    if (i + 1 < ldapString.Length && ldapString[i + 1] == ch)
                    {
                        sb.Append(ch);
                        i++;
                    }
                }
                else
                {
                    sb.Append(ch);
                }
            }
            return sb.ToString();
        }
    }
}