/// <summary>Reconstructs a permission with a specified state from an XML encoding.</summary>
/// <param name="elem">The XML encoding to use to reconstruct the permission. </param>
/// <exception cref="T:System.ArgumentNullException">The <paramref name="elem" /> parameter is null. </exception>
/// <exception cref="T:System.ArgumentException">The <paramref name="elem" /> parameter is not a valid permission element.-or- The <paramref name="elem" /> parameter's version number is not valid. </exception>
public void FromXml(SecurityElement elem)
{
this.CheckSecurityElement(elem, "elem", 1, 1);
this.principals.Clear();
if (elem.Children != null)
{
foreach (object obj in elem.Children)
{
SecurityElement securityElement = (SecurityElement)obj;
if (securityElement.Tag != "Identity")
{
throw new ArgumentException("not IPermission/Identity");
}
string name = securityElement.Attribute("ID");
string role = securityElement.Attribute("Role");
string text = securityElement.Attribute("Authenticated");
bool isAuthenticated = false;
if (text != null)
{
try
{
isAuthenticated = bool.Parse(text);
}
catch
{
}
}
PrincipalPermission.PrincipalInfo value = new PrincipalPermission.PrincipalInfo(name, role, isAuthenticated);
this.principals.Add(value);
}
}
}
/// <summary>Creates an XML encoding of the permission and its current state.</summary>
/// <returns>An XML encoding of the permission, including any state information.</returns>
public SecurityElement ToXml()
{
SecurityElement securityElement = new SecurityElement("Permission");
Type type = base.GetType();
securityElement.AddAttribute("class", type.FullName + ", " + type.Assembly.ToString().Replace('"', '\''));
securityElement.AddAttribute("version", 1.ToString());
foreach (object obj in this.principals)
{
PrincipalPermission.PrincipalInfo principalInfo = (PrincipalPermission.PrincipalInfo)obj;
SecurityElement securityElement2 = new SecurityElement("Identity");
if (principalInfo.Name != null)
{
securityElement2.AddAttribute("ID", principalInfo.Name);
}
if (principalInfo.Role != null)
{
securityElement2.AddAttribute("Role", principalInfo.Role);
}
if (principalInfo.IsAuthenticated)
{
securityElement2.AddAttribute("Authenticated", "true");
}
securityElement.AddChild(securityElement2);
}
return(securityElement);
}
/// <summary>Determines at run time whether the current principal matches the principal specified by the current permission.</summary>
/// <exception cref="T:System.Security.SecurityException">The current principal does not pass the security check for the principal specified by the current permission.-or- The current <see cref="T:System.Security.Principal.IPrincipal" /> is null. </exception>
public void Demand()
{
IPrincipal currentPrincipal = Thread.CurrentPrincipal;
if (currentPrincipal == null)
{
throw new SecurityException("no Principal");
}
if (this.principals.Count > 0)
{
bool flag = false;
foreach (object obj in this.principals)
{
PrincipalPermission.PrincipalInfo principalInfo = (PrincipalPermission.PrincipalInfo)obj;
if ((principalInfo.Name == null || principalInfo.Name == currentPrincipal.Identity.Name) && (principalInfo.Role == null || currentPrincipal.IsInRole(principalInfo.Role)) && ((principalInfo.IsAuthenticated && currentPrincipal.Identity.IsAuthenticated) || !principalInfo.IsAuthenticated))
{
flag = true;
break;
}
}
if (!flag)
{
throw new SecurityException("Demand for principal refused.");
}
}
}
/// <summary>Determines whether the current permission is a subset of the specified permission.</summary>
/// <returns>true if the current permission is a subset of the specified permission; otherwise, false.</returns>
/// <param name="target">A permission that is to be tested for the subset relationship. This permission must be of the same type as the current permission. </param>
/// <exception cref="T:System.ArgumentException">The <paramref name="target" /> parameter is an object that is not of the same type as the current permission. </exception>
public bool IsSubsetOf(IPermission target)
{
PrincipalPermission principalPermission = this.Cast(target);
if (principalPermission == null)
{
return(this.IsEmpty());
}
if (this.IsUnrestricted())
{
return(principalPermission.IsUnrestricted());
}
if (principalPermission.IsUnrestricted())
{
return(true);
}
foreach (object obj in this.principals)
{
PrincipalPermission.PrincipalInfo principalInfo = (PrincipalPermission.PrincipalInfo)obj;
bool flag = false;
foreach (object obj2 in principalPermission.principals)
{
PrincipalPermission.PrincipalInfo principalInfo2 = (PrincipalPermission.PrincipalInfo)obj2;
if ((principalInfo.Name == principalInfo2.Name || principalInfo2.Name == null) && (principalInfo.Role == principalInfo2.Role || principalInfo2.Role == null) && principalInfo.IsAuthenticated == principalInfo2.IsAuthenticated)
{
flag = true;
}
}
if (!flag)
{
return(false);
}
}
return(true);
}
/// <summary>Initializes a new instance of the <see cref="T:System.Security.Permissions.PrincipalPermission" /> class with the specified <see cref="T:System.Security.Permissions.PermissionState" />.</summary>
/// <param name="state">One of the <see cref="T:System.Security.Permissions.PermissionState" /> values. </param>
/// <exception cref="T:System.ArgumentException">The <paramref name="state" /> parameter is not a valid <see cref="T:System.Security.Permissions.PermissionState" />. </exception>
public PrincipalPermission(PermissionState state)
{
this.principals = new ArrayList();
if (CodeAccessPermission.CheckPermissionState(state, true) == PermissionState.Unrestricted)
{
PrincipalPermission.PrincipalInfo value = new PrincipalPermission.PrincipalInfo(null, null, true);
this.principals.Add(value);
}
}
/// <summary>Creates and returns a permission that is the intersection of the current permission and the specified permission.</summary>
/// <returns>A new permission that represents the intersection of the current permission and the specified permission. This new permission will be null if the intersection is empty.</returns>
/// <param name="target">A permission to intersect with the current permission. It must be of the same type as the current permission. </param>
/// <exception cref="T:System.ArgumentException">The <paramref name="target" /> parameter is not null and is not an instance of the same class as the current permission. </exception>
public IPermission Intersect(IPermission target)
{
PrincipalPermission principalPermission = this.Cast(target);
if (principalPermission == null)
{
return(null);
}
if (this.IsUnrestricted())
{
return(principalPermission.Copy());
}
if (principalPermission.IsUnrestricted())
{
return(this.Copy());
}
PrincipalPermission principalPermission2 = new PrincipalPermission(PermissionState.None);
foreach (object obj in this.principals)
{
PrincipalPermission.PrincipalInfo principalInfo = (PrincipalPermission.PrincipalInfo)obj;
foreach (object obj2 in principalPermission.principals)
{
PrincipalPermission.PrincipalInfo principalInfo2 = (PrincipalPermission.PrincipalInfo)obj2;
if (principalInfo.IsAuthenticated == principalInfo2.IsAuthenticated)
{
string text = null;
if (principalInfo.Name == principalInfo2.Name || principalInfo2.Name == null)
{
text = principalInfo.Name;
}
else if (principalInfo.Name == null)
{
text = principalInfo2.Name;
}
string text2 = null;
if (principalInfo.Role == principalInfo2.Role || principalInfo2.Role == null)
{
text2 = principalInfo.Role;
}
else if (principalInfo.Role == null)
{
text2 = principalInfo2.Role;
}
if (text != null || text2 != null)
{
PrincipalPermission.PrincipalInfo value = new PrincipalPermission.PrincipalInfo(text, text2, principalInfo.IsAuthenticated);
principalPermission2.principals.Add(value);
}
}
}
}
return((principalPermission2.principals.Count <= 0) ? null : principalPermission2);
}
/// <summary>Returns a value indicating whether the current permission is unrestricted.</summary>
/// <returns>true if the current permission is unrestricted; otherwise, false.</returns>
public bool IsUnrestricted()
{
foreach (object obj in this.principals)
{
PrincipalPermission.PrincipalInfo principalInfo = (PrincipalPermission.PrincipalInfo)obj;
if (principalInfo.Name == null && principalInfo.Role == null && principalInfo.IsAuthenticated)
{
return(true);
}
}
return(false);
}
/// <summary>Creates a permission that is the union of the current permission and the specified permission.</summary>
/// <returns>A new permission that represents the union of the current permission and the specified permission.</returns>
/// <param name="other">A permission to combine with the current permission. It must be of the same type as the current permission. </param>
/// <exception cref="T:System.ArgumentException">The <paramref name="other" /> parameter is an object that is not of the same type as the current permission. </exception>
public IPermission Union(IPermission other)
{
PrincipalPermission principalPermission = this.Cast(other);
if (principalPermission == null)
{
return(this.Copy());
}
if (this.IsUnrestricted() || principalPermission.IsUnrestricted())
{
return(new PrincipalPermission(PermissionState.Unrestricted));
}
PrincipalPermission principalPermission2 = new PrincipalPermission(this.principals);
foreach (object obj in principalPermission.principals)
{
PrincipalPermission.PrincipalInfo value = (PrincipalPermission.PrincipalInfo)obj;
principalPermission2.principals.Add(value);
}
return(principalPermission2);
}
public override bool Equals(object obj)
{
if (obj == null)
{
return(false);
}
PrincipalPermission principalPermission = obj as PrincipalPermission;
if (principalPermission == null)
{
return(false);
}
if (this.principals.Count != principalPermission.principals.Count)
{
return(false);
}
foreach (object obj2 in this.principals)
{
PrincipalPermission.PrincipalInfo principalInfo = (PrincipalPermission.PrincipalInfo)obj2;
bool flag = false;
foreach (object obj3 in principalPermission.principals)
{
PrincipalPermission.PrincipalInfo principalInfo2 = (PrincipalPermission.PrincipalInfo)obj3;
if ((principalInfo.Name == principalInfo2.Name || principalInfo2.Name == null) && (principalInfo.Role == principalInfo2.Role || principalInfo2.Role == null) && principalInfo.IsAuthenticated == principalInfo2.IsAuthenticated)
{
flag = true;
break;
}
}
if (!flag)
{
return(false);
}
}
return(true);
}
/// <summary>Initializes a new instance of the <see cref="T:System.Security.Permissions.PrincipalPermission" /> class for the specified <paramref name="name" />, <paramref name="role" />, and authentication status.</summary>
/// <param name="name">The name of the <see cref="T:System.Security.Principal.IPrincipal" /> object's user. </param>
/// <param name="role">The role of the <see cref="T:System.Security.Principal.IPrincipal" /> object's user (for example, Administrator). </param>
/// <param name="isAuthenticated">true to signify that the user is authenticated; otherwise, false. </param>
public PrincipalPermission(string name, string role, bool isAuthenticated)
{
this.principals = new ArrayList();
PrincipalPermission.PrincipalInfo value = new PrincipalPermission.PrincipalInfo(name, role, isAuthenticated);
this.principals.Add(value);
}
