DocSpace-buildtools/common/ASC.ActiveDirectory/Novell/Extensions/NovellLdapEntryExtension.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.
 *
*/


namespace ASC.ActiveDirectory.Novell.Extensions;
[Singletone]
public class NovellLdapEntryExtension
{
    private readonly IOptionsMonitor<ILog> _options;
    public NovellLdapEntryExtension(IOptionsMonitor<ILog> option)
    {
        _options = option;
    }
    public object GetAttributeValue(LdapEntry ldapEntry, string attributeName, bool getBytes = false)
    {
        try
        {
            var attribute = ldapEntry.GetAttribute(attributeName);

            if (attribute == null)
                return null;

            if (!(string.Equals(attributeName, LdapConstants.ADSchemaAttributes.OBJECT_SID,
                StringComparison.OrdinalIgnoreCase) || getBytes))
            {
                return attribute.StringValue;
            }

            if (attribute.ByteValue == null)
                return null;

            var value = new byte[attribute.ByteValue.Length];

            Buffer.BlockCopy(attribute.ByteValue, 0, value, 0, attribute.ByteValue.Length);

            if (getBytes)
            {
                return value;
            }

            return DecodeSid(value);
        }
        catch (Exception)
        {
            return null;
        }
    }

    public string[] GetAttributeArrayValue(LdapEntry ldapEntry, string attributeName)
    {
        var attribute = ldapEntry.GetAttribute(attributeName);
        return attribute == null ? null : attribute.StringValueArray;
    }

    private string DecodeSid(byte[] sid)
    {
        var strSid = new StringBuilder("S-");

        // get version
        int revision = sid[0];
        strSid.Append(revision.ToString(CultureInfo.InvariantCulture));

        //next byte is the count of sub-authorities
        var countSubAuths = sid[1] & 0xFF;

        //get the authority
        long authority = 0;

        //String rid = "";
        for (var i = 2; i <= 7; i++)
        {
            authority |= ((long)sid[i]) << (8 * (5 - (i - 2)));
        }

        strSid.Append("-");
        strSid.Append(authority);

        //iterate all the sub-auths
        var offset = 8;
        const int size = 4; //4 bytes for each sub auth

        for (var j = 0; j < countSubAuths; j++)
        {
            long subAuthority = 0;
            for (var k = 0; k < size; k++)
            {
                subAuthority |= (long)(sid[offset + k] & 0xFF) << (8 * k);
            }

            strSid.Append("-");
            strSid.Append(subAuthority);

            offset += size;
        }

        return strSid.ToString();
    }

    /// <summary>
    /// Create LDAPObject by LdapEntry
    /// </summary>
    /// <param name="ldapEntry">init ldapEntry</param>
    /// <param name="ldapUniqueIdAttribute"></param>
    /// <returns>LDAPObject</returns>
    public LdapObject ToLdapObject(LdapEntry ldapEntry, string ldapUniqueIdAttribute = null)
    {
        if (ldapEntry == null)
            throw new ArgumentNullException("ldapEntry");

        var novellLdapObject = new NovellLdapObject(_options, this);
        novellLdapObject.Init(ldapEntry, ldapUniqueIdAttribute);

        return novellLdapObject;
    }

    /// <summary>
    /// Create lis of LDAPObject by LdapEntry list
    /// </summary>
    /// <param name="entries">list of LdapEntry</param>
    /// <param name="ldapUniqueIdAttribute"></param>
    /// <returns>list of LDAPObjects</returns>
    public List<LdapObject> ToLdapObjects(IEnumerable<LdapEntry> entries, string ldapUniqueIdAttribute = null)
    {
        return entries.Select(e => ToLdapObject(e, ldapUniqueIdAttribute)).ToList();
    }
}