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//
// System.Net.Mail.SmtpPermission
//
// Authors:
// Sebastien Pouliot <sebastien@ximian.com>
//
// Copyright (C) 2006 Novell, Inc (http://www.novell.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
// NONINFRINGEMENT. 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.Security;
using System.Security.Permissions;
namespace System.Net.Mail {
[Serializable]
public sealed class SmtpPermission : CodeAccessPermission, IUnrestrictedPermission {
private const int version = 1;
private bool unrestricted;
private SmtpAccess access;
public SmtpPermission (bool unrestricted)
: base ()
{
this.unrestricted = unrestricted;
access = unrestricted ? SmtpAccess.ConnectToUnrestrictedPort : SmtpAccess.None;
}
public SmtpPermission (PermissionState state)
: base ()
{
unrestricted = (state == PermissionState.Unrestricted);
access = unrestricted ? SmtpAccess.ConnectToUnrestrictedPort : SmtpAccess.None;
}
public SmtpPermission (SmtpAccess access)
: base ()
{
// this ctor can accept invalid enum values
this.access = access;
}
public SmtpAccess Access {
get { return access; }
}
public void AddPermission (SmtpAccess access)
{
if (!unrestricted && (access > this.access)) {
this.access = access;
}
}
public override IPermission Copy ()
{
if (unrestricted) {
return new SmtpPermission (true);
} else {
return new SmtpPermission (access);
}
}
public override IPermission Intersect (IPermission target)
{
SmtpPermission sp = Cast (target);
if (sp == null)
return null;
if (unrestricted && sp.unrestricted)
return new SmtpPermission (true);
else if (access > sp.access)
return new SmtpPermission (sp.access);
else
return new SmtpPermission (access);
}
public override bool IsSubsetOf (IPermission target)
{
SmtpPermission sp = Cast (target);
if (sp == null)
return IsEmpty ();
if (unrestricted) {
return sp.unrestricted;
} else {
return (access <= sp.access);
}
}
public bool IsUnrestricted ()
{
return unrestricted;
}
public override SecurityElement ToXml ()
{
SecurityElement se = PermissionHelper.Element (typeof (SmtpPermission), version);
if (unrestricted) {
se.AddAttribute ("Unrestricted", "true");
} else {
switch (access) {
case SmtpAccess.ConnectToUnrestrictedPort:
se.AddAttribute ("Access", "ConnectToUnrestrictedPort");
break;
case SmtpAccess.Connect:
se.AddAttribute ("Access", "Connect");
break;
// note: SmtpAccess.None and invalid values aren't serialized to XML
}
}
return se;
}
public override void FromXml (SecurityElement securityElement)
{
PermissionHelper.CheckSecurityElement (securityElement, "securityElement", version, version);
// LAMESPEC: it says to throw an ArgumentNullException in this case
if (securityElement.Tag != "IPermission")
throw new ArgumentException ("securityElement");
if (PermissionHelper.IsUnrestricted (securityElement))
access = SmtpAccess.Connect;
else
access = SmtpAccess.None;
}
public override IPermission Union (IPermission target)
{
SmtpPermission sp = Cast (target);
if (sp == null)
return Copy ();
if (unrestricted || sp.unrestricted)
return new SmtpPermission (true);
else if (access > sp.access)
return new SmtpPermission (access);
else
return new SmtpPermission (sp.access);
}
// Internal helpers methods
private bool IsEmpty ()
{
return (!unrestricted && (access == SmtpAccess.None));
}
private SmtpPermission Cast (IPermission target)
{
if (target == null)
return null;
SmtpPermission sp = (target as SmtpPermission);
if (sp == null) {
PermissionHelper.ThrowInvalidPermission (target, typeof (SmtpPermission));
}
return sp;
}
}
}
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