// ----------------------------------------------------------------------------
//
//  Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ----------------------------------------------------------------------------

namespace Microsoft.Singularity.Security
{
    using System;
    using Microsoft.Singularity.V1.Security;
    using Microsoft.Singularity.Channels;

    /// <summary>
    /// A Principal struct is a representation of a principal.
    /// There are methods here to retrieve the Principal of a process
    /// and to resolve the principal name of a Principal.
    /// See the security library for methods to evaluate whether
    /// Principals satisfy ACLs.
    /// </summary>

    // This is the process library version of Principal.sg.  The
    // kernel side is similar, but has additional methods and constructors.

    // This struct layers PrincipalHandle to hide the ABI type from clients.

    public struct Principal
    {
        private readonly PrincipalHandle handle;

        internal Principal(PrincipalHandle h)
        {
            this.handle = h;
        }

        public Principal(Endpoint*! in ExHeap ep)
        {
            this.handle = ep->PeerPrincipalHandle;
        }

        public static Principal Self()
        {
            return new Principal(PrincipalHandle.SelfPrincipalHandle());
        }

        public static Principal EndpointPeer(Endpoint*! in ExHeap ep)
        {
            return new Principal(ep->PeerPrincipalHandle);
        }

        public static Principal EndpointOwner(Endpoint*! in ExHeap ep)
        {
            return new Principal(ep->OwnerPrincipalHandle);
        }

        public static string ExpandAclIndirection (string! name)
        {
            return PrincipalHandle.ExpandAclIndirection(name);
        }

        public ulong Val { get { return this.handle.val; } }

        public bool Equal(Principal p) { return (this.Val == p.Val); }

        public string! GetName()
        {
            return (!)PrincipalHandle.GetPrincipalName(this.handle);
        }
    }
}