ViewOnlyAuthority.cs

using System;
 
namespace Waher.Things.Authorities
{
    public class ViewOnlyAuthority : Authority
    {
        private readonly string[] dataSourceIds;
 
        public ViewOnlyAuthority(string From)
            : this(From, null, null, null, (string[])null)
        {
        }
 
        public ViewOnlyAuthority(string From, string[] DeviceTokens, string[] ServiceTokens,
            string[] UserTokens)
            : this(From, DeviceTokens, ServiceTokens, UserTokens, null)
        {
        }
 
        public ViewOnlyAuthority(string From, params string[] DataSourceIds)
            : this(From, null, null, null, DataSourceIds)
        {
        }
 
        public ViewOnlyAuthority(string From, string[] DeviceTokens, string[] ServiceTokens,
            string[] UserTokens, params string[] DataSourceIds)
            : base(From, DeviceTokens, ServiceTokens, UserTokens)
        {
            this.dataSourceIds = DataSourceIds;
        }
 
        public override bool HasPrivilege(string Privilege)
        {
            string[] Parts = Privilege?.Split(':');
            if ((Parts?.Length ?? 0) < 2)
                return false;
 
            if (Parts[0] != "Source")
                return false;
 
            if (!(this.dataSourceIds is null) &&
                Array.IndexOf(this.dataSourceIds, Parts[1]) < 0)
            {
                return false;
            }
 
            switch (Parts.Length)
            {
                case 3:
                    return Parts[2] == "View";
 
                case 4:
                    return Parts[2] == "Node" && Parts[3] == "View";
 
                default:
                    return false;
            }
        }
    }
}