ClaimComparer.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / IdentityModel / System / IdentityModel / Claims / ClaimComparer.cs / 1305376 / ClaimComparer.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.IdentityModel.Claims 
{
    using System.Collections; 
    using System.Collections.Generic; 
    using System.Diagnostics;
    using System.Runtime.CompilerServices; 
    using System.Security.Cryptography;
    using System.Security.Cryptography.X509Certificates;
    using System.Security.Principal;
 
    class ClaimComparer : IEqualityComparer
    { 
        static IEqualityComparer defaultComparer; 
        static IEqualityComparer hashComparer;
        static IEqualityComparer dnsComparer; 
        static IEqualityComparer rsaComparer;
        static IEqualityComparer thumbprintComparer;
        static IEqualityComparer upnComparer;
        static IEqualityComparer x500DistinguishedNameComparer; 
        IEqualityComparer resourceComparer;
 
        ClaimComparer(IEqualityComparer resourceComparer) 
        {
            this.resourceComparer = resourceComparer; 
        }

        public static IEqualityComparer GetComparer(string claimType)
        { 
            if (claimType == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("claimType"); 
            if (claimType == ClaimTypes.Dns) 
                return Dns;
            if (claimType == ClaimTypes.Hash) 
                return Hash;
            if (claimType == ClaimTypes.Rsa)
                return Rsa;
            if (claimType == ClaimTypes.Thumbprint) 
                return Thumbprint;
            if (claimType == ClaimTypes.Upn) 
                return Upn; 
            if (claimType == ClaimTypes.X500DistinguishedName)
                return X500DistinguishedName; 
            return Default;
        }

        public static IEqualityComparer Default 
        {
            get 
            { 
                if (defaultComparer == null)
                { 
                    defaultComparer = new ClaimComparer(new ObjectComparer());
                }
                return defaultComparer;
            } 
        }
 
        public static IEqualityComparer Dns 
        {
            get 
            {
                if (dnsComparer == null)
                {
                    dnsComparer = new ClaimComparer(StringComparer.OrdinalIgnoreCase); 
                }
                return dnsComparer; 
            } 
        }
 
        public static IEqualityComparer Hash
        {
            get
            { 
                if (hashComparer == null)
                { 
                    hashComparer = new ClaimComparer(new BinaryObjectComparer()); 
                }
                return hashComparer; 
            }
        }

        public static IEqualityComparer Rsa 
        {
            get 
            { 
                if (rsaComparer == null)
                { 
                    rsaComparer = new ClaimComparer(new RsaObjectComparer());
                }
                return rsaComparer;
            } 
        }
 
        public static IEqualityComparer Thumbprint 
        {
            get 
            {
                if (thumbprintComparer == null)
                {
                    thumbprintComparer = new ClaimComparer(new BinaryObjectComparer()); 
                }
                return thumbprintComparer; 
            } 
        }
 
        public static IEqualityComparer Upn
        {
            get
            { 
                if (upnComparer == null)
                { 
                    upnComparer = new ClaimComparer(new UpnObjectComparer()); 
                }
                return upnComparer; 
            }
        }

        public static IEqualityComparer X500DistinguishedName 
        {
            get 
            { 
                if (x500DistinguishedNameComparer == null)
                { 
                    x500DistinguishedNameComparer = new ClaimComparer(new X500DistinguishedNameObjectComparer());
                }
                return x500DistinguishedNameComparer;
            } 
        }
 
        // we still need to review how the default equals works, this is not how Doug envisioned it. 
        public bool Equals(Claim claim1, Claim claim2)
        { 
            if (ReferenceEquals(claim1, claim2))
                return true;

            if (claim1 == null || claim2 == null) 
                return false;
 
            if (claim1.ClaimType != claim2.ClaimType || claim1.Right != claim2.Right) 
                return false;
 
            return resourceComparer.Equals(claim1.Resource, claim2.Resource);
        }

        public int GetHashCode(Claim claim) 
        {
            if (claim == null) 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("claim"); 

            return claim.ClaimType.GetHashCode() ^ claim.Right.GetHashCode() 
                ^ ( (claim.Resource == null) ? 0 : resourceComparer.GetHashCode(claim.Resource));
        }

        class ObjectComparer : IEqualityComparer 
        {
            bool IEqualityComparer.Equals(object obj1, object obj2) 
            { 
                if (obj1 == null && obj2 == null)
                    return true; 
                if (obj1 == null || obj2 == null)
                    return false;
                return obj1.Equals(obj2);
            } 

            int IEqualityComparer.GetHashCode(object obj) 
            { 
                if (obj == null)
                    return 0; 
                return obj.GetHashCode();
            }
        }
 
        class BinaryObjectComparer : IEqualityComparer
        { 
            bool IEqualityComparer.Equals(object obj1, object obj2) 
            {
                if (ReferenceEquals(obj1, obj2)) 
                    return true;

                byte[] bytes1 = obj1 as byte[];
                byte[] bytes2 = obj2 as byte[]; 
                if (bytes1 == null || bytes2 == null)
                    return false; 
 
                if (bytes1.Length != bytes2.Length)
                    return false; 

                for (int i = 0; i < bytes1.Length; ++i)
                {
                    if (bytes1[i] != bytes2[i]) 
                        return false;
                } 
 
                return true;
            } 

            int IEqualityComparer.GetHashCode(object obj)
            {
                byte[] bytes = obj as byte[]; 
                if (bytes == null)
                    return 0; 
 
                int hashCode = 0;
                for (int i = 0; i < bytes.Length && i < 4; ++i) 
                {
                    hashCode = (hashCode << 8) | bytes[i];
                }
 
                return hashCode ^ bytes.Length;
            } 
        } 

        class RsaObjectComparer : IEqualityComparer 
        {
            bool IEqualityComparer.Equals(object obj1, object obj2)
            {
                if (ReferenceEquals(obj1, obj2)) 
                    return true;
 
                RSA rsa1 = obj1 as RSA; 
                RSA rsa2 = obj2 as RSA;
                if (rsa1 == null || rsa2 == null) 
                    return false;

                RSAParameters parm1 = rsa1.ExportParameters(false);
                RSAParameters parm2 = rsa2.ExportParameters(false); 

                if (parm1.Modulus.Length != parm2.Modulus.Length || 
                    parm1.Exponent.Length != parm2.Exponent.Length) 
                    return false;
 
                for (int i = 0; i < parm1.Modulus.Length; ++i)
                {
                    if (parm1.Modulus[i] != parm2.Modulus[i])
                        return false; 
                }
                for (int i = 0; i < parm1.Exponent.Length; ++i) 
                { 
                    if (parm1.Exponent[i] != parm2.Exponent[i])
                        return false; 
                }
                return true;
            }
 
            int IEqualityComparer.GetHashCode(object obj)
            { 
                RSA rsa = obj as RSA; 
                if (rsa == null)
                    return 0; 

                RSAParameters parm = rsa.ExportParameters(false);
                return parm.Modulus.Length ^ parm.Exponent.Length;
            } 
        }
 
        class X500DistinguishedNameObjectComparer : IEqualityComparer 
        {
            IEqualityComparer binaryComparer; 
            public X500DistinguishedNameObjectComparer()
            {
                binaryComparer = new BinaryObjectComparer();
            } 

            bool IEqualityComparer.Equals(object obj1, object obj2) 
            { 
                if (ReferenceEquals(obj1, obj2))
                    return true; 

                X500DistinguishedName dn1 = obj1 as X500DistinguishedName;
                X500DistinguishedName dn2 = obj2 as X500DistinguishedName;
                if (dn1 == null || dn2 == null) 
                    return false;
 
                // 1) Hopefully cover most cases (perf reason). 
                if (StringComparer.Ordinal.Equals(dn1.Name, dn2.Name))
                    return true; 

                // 2) Raw byte compare.  Note: we assume the rawbyte is in the same order
                // (default = X500DistinguishedNameFlags.Reversed).
                return binaryComparer.Equals(dn1.RawData, dn2.RawData); 
            }
 
            int IEqualityComparer.GetHashCode(object obj) 
            {
                X500DistinguishedName dn = obj as X500DistinguishedName; 
                if (dn == null)
                    return 0;

                return binaryComparer.GetHashCode(dn.RawData); 
            }
        } 
 
        class UpnObjectComparer : IEqualityComparer
        { 
            bool IEqualityComparer.Equals(object obj1, object obj2)
            {
                if (StringComparer.OrdinalIgnoreCase.Equals(obj1, obj2))
                    return true; 

                string upn1 = obj1 as string; 
                string upn2 = obj2 as string; 
                if (upn1 == null || upn2 == null)
                    return false; 

                SecurityIdentifier sid1;
                if (!TryLookupSidFromName(upn1, out sid1))
                    return false; 

                // Normalize to sid 
                SecurityIdentifier sid2; 
                if (!TryLookupSidFromName(upn2, out sid2))
                    return false; 

                return sid1 == sid2;
            }
 
            int IEqualityComparer.GetHashCode(object obj)
            { 
                string upn = obj as string; 
                if (upn == null)
                    return 0; 

                // Normalize to sid
                SecurityIdentifier sid;
                if (TryLookupSidFromName(upn, out sid)) 
                    return sid.GetHashCode();
 
                return StringComparer.OrdinalIgnoreCase.GetHashCode(upn); 
            }
 
            bool TryLookupSidFromName(string upn, out SecurityIdentifier sid)
            {
                sid = null;
                try 
                {
                    NTAccount acct = new NTAccount(upn); 
                    sid = acct.Translate(typeof(SecurityIdentifier)) as SecurityIdentifier; 
                }
                catch (IdentityNotMappedException e) 
                {
                    if (DiagnosticUtility.ShouldTraceInformation)
                    {
                        DiagnosticUtility.ExceptionUtility.TraceHandledException(e, TraceEventType.Information); 
                    }
                } 
                return sid != null; 
            }
        } 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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