SecurityTokenResolver.cs source code in C# .NET

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

namespace System.IdentityModel.Selectors 
{
    using System.Collections.ObjectModel; 
    using System.IdentityModel.Tokens; 

    public abstract class SecurityTokenResolver 
    {
        public SecurityToken ResolveToken(SecurityKeyIdentifier keyIdentifier)
        {
            if (keyIdentifier == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifier"); 
            } 
            SecurityToken token;
            if (!this.TryResolveTokenCore(keyIdentifier, out token)) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.UnableToResolveTokenReference, keyIdentifier)));
            }
            return token; 
        }
 
        public bool TryResolveToken(SecurityKeyIdentifier keyIdentifier, out SecurityToken token) 
        {
            if (keyIdentifier == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifier");
            }
            return TryResolveTokenCore(keyIdentifier, out token); 
        }
 
        public SecurityToken ResolveToken(SecurityKeyIdentifierClause keyIdentifierClause) 
        {
            if (keyIdentifierClause == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifierClause");
            }
            SecurityToken token; 
            if (!this.TryResolveTokenCore(keyIdentifierClause, out token))
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.UnableToResolveTokenReference, keyIdentifierClause))); 
            }
            return token; 
        }

        public bool TryResolveToken(SecurityKeyIdentifierClause keyIdentifierClause, out SecurityToken token)
        { 
            if (keyIdentifierClause == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifierClause"); 
            }
            return this.TryResolveTokenCore(keyIdentifierClause, out token); 
        }

        public SecurityKey ResolveSecurityKey(SecurityKeyIdentifierClause keyIdentifierClause)
        { 
            if (keyIdentifierClause == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifierClause"); 
            }
            SecurityKey key; 
            if (!this.TryResolveSecurityKeyCore(keyIdentifierClause, out key))
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.UnableToResolveKeyReference, keyIdentifierClause)));
            } 
            return key;
        } 
 
        public bool TryResolveSecurityKey(SecurityKeyIdentifierClause keyIdentifierClause, out SecurityKey key)
        { 
            if (keyIdentifierClause == null)
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifierClause");
            } 
            return this.TryResolveSecurityKeyCore(keyIdentifierClause, out key);
        } 
 
        // protected methods
        protected abstract bool TryResolveTokenCore(SecurityKeyIdentifier keyIdentifier, out SecurityToken token); 
        protected abstract bool TryResolveTokenCore(SecurityKeyIdentifierClause keyIdentifierClause, out SecurityToken token);
        protected abstract bool TryResolveSecurityKeyCore(SecurityKeyIdentifierClause keyIdentifierClause, out SecurityKey key);

 
        public static SecurityTokenResolver CreateDefaultSecurityTokenResolver(ReadOnlyCollection tokens, bool canMatchLocalId)
        { 
            return new SimpleTokenResolver(tokens, canMatchLocalId); 
        }
 
        class SimpleTokenResolver : SecurityTokenResolver
        {
            ReadOnlyCollection tokens;
            bool canMatchLocalId; 

            public SimpleTokenResolver(ReadOnlyCollection tokens, bool canMatchLocalId) 
            { 
                if (tokens == null)
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("tokens"); 

                this.tokens = tokens;
                this.canMatchLocalId = canMatchLocalId;
            } 

            protected override bool TryResolveSecurityKeyCore(SecurityKeyIdentifierClause keyIdentifierClause, out SecurityKey key) 
            { 
                if (keyIdentifierClause == null)
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifierClause"); 

                key = null;
                for (int i = 0; i < this.tokens.Count; ++i)
                { 
                    SecurityKey securityKey = this.tokens[i].ResolveKeyIdentifierClause(keyIdentifierClause);
                    if (securityKey != null) 
                    { 
                        key = securityKey;
                        return true; 
                    }
                }

                if (keyIdentifierClause is EncryptedKeyIdentifierClause) 
                {
                    EncryptedKeyIdentifierClause keyClause = (EncryptedKeyIdentifierClause)keyIdentifierClause; 
                    SecurityKeyIdentifier keyIdentifier = keyClause.EncryptingKeyIdentifier; 
                    if (keyIdentifier != null && keyIdentifier.Count > 0)
                    { 
                        for (int i = 0; i < keyIdentifier.Count; i++)
                        {
                            SecurityKey unwrappingSecurityKey = null;
                            if (TryResolveSecurityKey(keyIdentifier[i], out unwrappingSecurityKey)) 
                            {
                                byte[] wrappedKey = keyClause.GetEncryptedKey(); 
                                string wrappingAlgorithm = keyClause.EncryptionMethod; 
                                byte[] unwrappedKey = unwrappingSecurityKey.DecryptKey(wrappingAlgorithm, wrappedKey);
                                key = new InMemorySymmetricSecurityKey(unwrappedKey, false); 
                                return true;
                            }
                        }
                    } 
                }
 
                return key != null; 
            }
 
            protected override bool TryResolveTokenCore(SecurityKeyIdentifier keyIdentifier, out SecurityToken token)
            {
                if (keyIdentifier == null)
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifier"); 

                token = null; 
                for (int i = 0; i < keyIdentifier.Count; ++i) 
                {
 
                    SecurityToken securityToken = ResolveSecurityToken(keyIdentifier[i]);
                    if (securityToken != null)
                    {
                        token = securityToken; 
                        break;
                    } 
                } 

                return (token != null); 
            }

            protected override bool TryResolveTokenCore(SecurityKeyIdentifierClause keyIdentifierClause, out SecurityToken token)
            { 
                if (keyIdentifierClause == null)
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifierClause"); 
 
                token = null;
 
                SecurityToken securityToken = ResolveSecurityToken(keyIdentifierClause);
                if (securityToken != null)
                    token = securityToken;
 
                return (token != null);
            } 
 
            SecurityToken ResolveSecurityToken(SecurityKeyIdentifierClause keyIdentifierClause)
            { 
                if (keyIdentifierClause == null)
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifierClause");

                if (!this.canMatchLocalId && keyIdentifierClause is LocalIdKeyIdentifierClause) 
                    return null;
 
                for (int i = 0; i < this.tokens.Count; ++i) 
                {
                    if (this.tokens[i].MatchesKeyIdentifierClause(keyIdentifierClause)) 
                        return this.tokens[i];
                }

                return null; 
            }
 
        } 

    } 
}

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