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//------------------------------------------------------------------------------
// <copyright file="AuthorizationRuleCollection.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.Configuration {
using System;
using System.Xml;
using System.Configuration;
using System.Collections.Specialized;
using System.Collections;
using System.Globalization;
using System.IO;
using System.Text;
using System.Security.Principal;
using System.Web.Util;
using System.ComponentModel;
using System.Security.Permissions;
[ConfigurationCollection(typeof(AuthorizationRule), AddItemName = "allow,deny",
CollectionType = ConfigurationElementCollectionType.BasicMapAlternate)]
public sealed class AuthorizationRuleCollection : ConfigurationElementCollection {
private static ConfigurationPropertyCollection _properties;
static AuthorizationRuleCollection() {
_properties = new ConfigurationPropertyCollection();
}
public AuthorizationRuleCollection() {
}
protected override ConfigurationPropertyCollection Properties {
get {
return _properties;
}
}
// public properties
public AuthorizationRule this[int index] {
get {
return (AuthorizationRule)BaseGet(index);
}
set {
if (BaseGet(index) != null) {
BaseRemoveAt(index);
}
BaseAdd(index, value);
}
}
// Protected Overrides
protected override ConfigurationElement CreateNewElement() {
return new AuthorizationRule();
}
protected override ConfigurationElement CreateNewElement(string elementName) {
AuthorizationRule newElement = new AuthorizationRule();
switch (elementName.ToLower(CultureInfo.InvariantCulture)) {
case "allow":
newElement.Action = AuthorizationRuleAction.Allow;
break;
case "deny":
newElement.Action = AuthorizationRuleAction.Deny;
break;
}
return newElement;
}
protected override Object GetElementKey(ConfigurationElement element) {
AuthorizationRule rule = (AuthorizationRule)element;
return rule._ActionString;
}
protected override string ElementName {
get {
return String.Empty; //_LookUpInElement_
}
}
public override ConfigurationElementCollectionType CollectionType {
get {
return ConfigurationElementCollectionType.BasicMapAlternate;
}
}
// IsElement name allows collection with multiple element names to
// exist with the base class architecture. Given an element name
// it simply returns true if the name is legal for the default collection
// or false otherwise.
protected override bool IsElementName(string elementname) {
bool IsElement = false;
switch (elementname.ToLower(CultureInfo.InvariantCulture)) {
case "allow":
case "deny":
IsElement = true;
break;
}
return IsElement;
}
internal bool IsUserAllowed(IPrincipal user, String verb) {
if (user == null) {
return false;
}
if (!_fCheckForCommonCasesDone) {
DoCheckForCommonCases();
_fCheckForCommonCasesDone = true;
}
if (!user.Identity.IsAuthenticated && _iAnonymousAllowed != 0)
return (_iAnonymousAllowed > 0);
if (_iAllUsersAllowed != 0)
return (_iAllUsersAllowed > 0);
// Go down the list permissions and check each one
foreach (AuthorizationRule rule in this) {
int result = rule.IsUserAllowed(user, verb);
if (result != 0)
return (result > 0);
}
return false;
}
private void DoCheckForCommonCases()
{
bool fStillLookingForAnonymous = true;
bool fAnyAllowRulesFound = false;
bool fAnyDenyRulesFound = false;
foreach (AuthorizationRule rule in this)
{
if (rule.Everyone) // Found a rule for Every-user
{
if (!fAnyAllowRulesFound && rule.Action == AuthorizationRuleAction.Deny)
_iAllUsersAllowed = -1;
if (!fAnyDenyRulesFound && rule.Action == AuthorizationRuleAction.Allow)
_iAllUsersAllowed = 1;
return; // done!
}
if (fStillLookingForAnonymous && rule.IncludesAnonymous) // Found a rule for anonymous-user
{
if (!fAnyAllowRulesFound && rule.Action == AuthorizationRuleAction.Deny)
_iAnonymousAllowed = -1;
if (!fAnyDenyRulesFound && rule.Action == AuthorizationRuleAction.Allow)
_iAnonymousAllowed = 1;
fStillLookingForAnonymous = false;
}
if (!fAnyAllowRulesFound && rule.Action == AuthorizationRuleAction.Allow)
fAnyAllowRulesFound = true;
if (!fAnyDenyRulesFound && rule.Action == AuthorizationRuleAction.Deny)
fAnyDenyRulesFound = true;
if (!fStillLookingForAnonymous && fAnyAllowRulesFound && fAnyDenyRulesFound)
return;
}
}
// public methods
public void Add(AuthorizationRule rule) {
BaseAdd(-1, rule); // add to the end of the list and dont overwrite dups!
}
public void Clear() {
BaseClear();
}
public AuthorizationRule Get(int index) {
return (AuthorizationRule)BaseGet(index);
}
public void RemoveAt(int index) {
BaseRemoveAt(index);
}
public void Set(int index, AuthorizationRule rule) {
BaseAdd(index, rule);
}
public int IndexOf(AuthorizationRule rule) {
for (int x = 0; x < Count; x++) {
if (Object.Equals(Get(x), rule)) {
return x;
}
}
return -1;
}
public void Remove(AuthorizationRule rule) {
int index = IndexOf(rule);
if (index >= 0) {
BaseRemoveAt(index);
}
}
private int _iAllUsersAllowed = 0;
private int _iAnonymousAllowed = 0;
private bool _fCheckForCommonCasesDone = false;
}
}
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