SerializableAuthorizationContext.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx35 / System.WorkflowServices / System / ServiceModel / Security / SerializableAuthorizationContext.cs / 1305376 / SerializableAuthorizationContext.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.ServiceModel.Security 
{
    using System.IdentityModel.Policy; 
    using System.Collections.ObjectModel; 
    using System.IdentityModel.Claims;
    using System.Collections.Generic; 
    using System.Runtime.Serialization;
    using System.IO;
    using System.Xml;
    using System.ServiceModel.Dispatcher; 
    using System.Security.Principal;
    using System.ServiceModel.Security.Tokens; 
 
    [Serializable]
    class SerializableAuthorizationContext 
    {
        static readonly IList redBitsKnownType = new List(
            new Type[]{
                typeof(DefaultClaimSet), 
                typeof(WindowsClaimSet),
                typeof(X509CertificateClaimSet), 
                typeof(Claim) 
            });
 
        byte[] contextBlob;
        DateTime expirationTime;
        string id;
        IList knownTypes; 

        SerializableAuthorizationContext(byte[] contextBlob, DateTime expirationTime, string id, IList knownTypes) 
        { 
            if (contextBlob == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("contextBlob");
            }

            this.expirationTime = expirationTime; 
            this.id = id;
            this.contextBlob = contextBlob; 
            this.knownTypes = knownTypes; 
        }
 
        public static SerializableAuthorizationContext From(AuthorizationContext authorizationContext)
        {
            if (authorizationContext == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("authorizationContext");
            } 
 
            IList knownTypes = BuildKnownClaimTypes(authorizationContext);
            byte[] contextBlob = CreateSerializableBlob(authorizationContext, knownTypes); 

            return new SerializableAuthorizationContext(contextBlob, authorizationContext.ExpirationTime, authorizationContext.Id, knownTypes);
        }
 
        public AuthorizationContext Retrieve()
        { 
            List authorizationPolicies = new List(1); 
            authorizationPolicies.Add(RetrievePolicyFromBlob(this.contextBlob, this.id, this.expirationTime, this.knownTypes));
            return AuthorizationContext.CreateDefaultAuthorizationContext(authorizationPolicies); 
        }

        static IList BuildKnownClaimTypes(AuthorizationContext authorizationContext)
        { 
            List knownTypes = new List();
 
            foreach (ClaimSet claimSet in authorizationContext.ClaimSets) 
            {
                Type claimSetType = claimSet.GetType(); 

                if (!redBitsKnownType.Contains(claimSetType) && !knownTypes.Contains(claimSetType))
                {
                    knownTypes.Add(claimSetType); 
                }
 
                foreach (Claim claim in claimSet) 
                {
                    Type claimType = claim.GetType(); 

                    if (!redBitsKnownType.Contains(claimType) && !knownTypes.Contains(claimType))
                    {
                        knownTypes.Add(claimType); 
                    }
                } 
            } 

            if (knownTypes.Count != 0) 
            {
                return knownTypes;
            }
 
            return null;
        } 
 
        static byte[] CreateSerializableBlob(AuthorizationContext authorizationContext, IList knownTypes)
        { 
            if (authorizationContext == null)
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("authorizationContext");
            } 

            MemoryStream stream = new MemoryStream(); 
            XmlDictionaryWriter writer = XmlDictionaryWriter.CreateBinaryWriter(stream, SctClaimDictionary.Instance, null); 
            SctClaimDictionary claimDictionary = SctClaimDictionary.Instance;
 

            writer.WriteStartElement(claimDictionary.SecurityContextSecurityToken, claimDictionary.EmptyString);
            writer.WriteStartElement(claimDictionary.Version, claimDictionary.EmptyString);
            writer.WriteValue(1); 
            writer.WriteEndElement();
 
            if ((authorizationContext != null) && (authorizationContext.ClaimSets.Count != 0)) 
            {
                DataContractSerializer identitySerializer = DataContractSerializerDefaults.CreateSerializer(typeof(IIdentity), knownTypes, 0x7fffffff); 
                DataContractSerializer claimSetSerializer = DataContractSerializerDefaults.CreateSerializer(typeof(ClaimSet), knownTypes, 0x7fffffff);
                DataContractSerializer claimSerializer = DataContractSerializerDefaults.CreateSerializer(typeof(Claim), knownTypes, 0x7fffffff);
                SctClaimSerializer.SerializeIdentities(authorizationContext, claimDictionary, writer, identitySerializer);
 
                writer.WriteStartElement(claimDictionary.ClaimSets, claimDictionary.EmptyString);
                for (int i = 0; i < authorizationContext.ClaimSets.Count; i++) 
                { 
                    SctClaimSerializer.SerializeClaimSet(authorizationContext.ClaimSets[i], claimDictionary, writer, claimSetSerializer, claimSerializer);
                } 
                writer.WriteEndElement();
            }

            writer.WriteEndElement(); 
            writer.Flush();
            return stream.ToArray(); 
        } 

        static IAuthorizationPolicy RetrievePolicyFromBlob(byte[] contextBlob, string id, DateTime expirationTime, IList knownTypes) 
        {
            if (contextBlob == null)
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("contextBlob"); 
            }
 
            if (id == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("id"); 
            }

            SctClaimDictionary claimDictionary = SctClaimDictionary.Instance;
            XmlDictionaryReader reader = XmlDictionaryReader.CreateBinaryReader(contextBlob, 0, contextBlob.Length, claimDictionary, XmlDictionaryReaderQuotas.Max, null, null); 
            IList identities = null;
            IList claimSets = null; 
            int versionNumber = -1; 

            reader.ReadFullStartElement(claimDictionary.SecurityContextSecurityToken, claimDictionary.EmptyString); 

            while (reader.IsStartElement())
            {
                if (reader.IsStartElement(claimDictionary.Version, claimDictionary.EmptyString)) 
                {
                    versionNumber = reader.ReadElementContentAsInt(); 
 
                    if (versionNumber != 1)
                    { 
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotSupportedException(SR2.GetString(SR2.SerializedAuthorizationContextVersionUnsupported, versionNumber)));
                    }
                }
                else 
                {
                    if (reader.IsStartElement(claimDictionary.Identities, claimDictionary.EmptyString)) 
                    { 
                        identities = SctClaimSerializer.DeserializeIdentities(reader, claimDictionary, DataContractSerializerDefaults.CreateSerializer(typeof(IIdentity), knownTypes, 0x7fffffff));
                        continue; 
                    }
                    if (reader.IsStartElement(claimDictionary.ClaimSets, claimDictionary.EmptyString))
                    {
                        reader.ReadStartElement(); 
                        DataContractSerializer claimSetSerializer = DataContractSerializerDefaults.CreateSerializer(typeof(ClaimSet), knownTypes, 0x7fffffff);
                        DataContractSerializer claimSerializer = DataContractSerializerDefaults.CreateSerializer(typeof(Claim), knownTypes, 0x7fffffff); 
                        claimSets = new List(1); 

                        while (reader.IsStartElement()) 
                        {
                            claimSets.Add(SctClaimSerializer.DeserializeClaimSet(reader, claimDictionary, claimSetSerializer, claimSerializer));
                        }
 
                        reader.ReadEndElement();
                        continue; 
                    } 
                }
            } 
            reader.ReadEndElement();
            return new SctUnconditionalPolicy(identities, id, claimSets, expirationTime);
        }
 
        class SctUnconditionalPolicy : IAuthorizationPolicy, IAuthorizationComponent
        { 
 
            IList claimSets;
            DateTime expirationTime; 
            string id;
            IList identities;

            public SctUnconditionalPolicy(IList identities, string id, IList claimSets, DateTime expirationTime) 
            {
                this.identities = identities; 
                this.claimSets = claimSets; 
                this.expirationTime = expirationTime;
                this.id = id; 
            }

            public string Id
            { 
                get
                { 
                    return this.id; 
                }
            } 

            public ClaimSet Issuer
            {
                get 
                {
                    return ClaimSet.System; 
                } 
            }
 
            public bool Evaluate(EvaluationContext evaluationContext, ref object state)
            {
                for (int num1 = 0; num1 < this.claimSets.Count; num1++)
                { 
                    evaluationContext.AddClaimSet(this, this.claimSets[num1]);
                } 
                if (this.identities != null) 
                {
                    object obj; 
                    if (!evaluationContext.Properties.TryGetValue("Identities", out obj))
                    {
                        evaluationContext.Properties.Add("Identities", (object) this.identities);
                    } 
                    else
                    { 
                        List identities = obj as List; 
                        if (identities != null)
                        { 
                            identities.AddRange(this.identities);
                        }
                    }
                } 
                evaluationContext.RecordExpirationTime(this.expirationTime);
                return true; 
            } 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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SerializableAuthorizationContext.cs source code in C# .NET

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