Code:
/ WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / Serialization / System / Runtime / Serialization / XmlDataContract.cs / 1 / XmlDataContract.cs
//------------------------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- namespace System.Runtime.Serialization { using System; //using System.ServiceModel.Channels; using System.Collections.Generic; using System.Security.Permissions; using System.Reflection; using System.Threading; using System.Xml; using DataContractDictionary=System.Collections.Generic.Dictionary; using System.Xml.Serialization; using System.Xml.Schema; using System.Security; internal delegate IXmlSerializable CreateXmlSerializableDelegate(); internal sealed class XmlDataContract : DataContract { /// /// Critical - holds instance of CriticalHelper which keeps state that is cached statically for serialization. /// Static fields are marked SecurityCritical or readonly to prevent /// data from being modified or leaked to other components in appdomain. /// [SecurityCritical] XmlDataContractCriticalHelper helper; ////// Critical - initializes SecurityCritical field 'helper' /// Safe - doesn't leak anything /// [SecurityCritical, SecurityTreatAsSafe] internal XmlDataContract() : base(new XmlDataContractCriticalHelper()) { helper = base.Helper as XmlDataContractCriticalHelper; } ////// Critical - initializes SecurityCritical field 'helper' /// Safe - doesn't leak anything /// [SecurityCritical, SecurityTreatAsSafe] internal XmlDataContract(Type type) : base(new XmlDataContractCriticalHelper(type)) { helper = base.Helper as XmlDataContractCriticalHelper; } internal override DataContractDictionary KnownDataContracts { ////// Critical - fetches the critical KnownDataContracts property /// Safe - KnownDataContracts only needs to be protected for write /// [SecurityCritical, SecurityTreatAsSafe] get { return helper.KnownDataContracts; } ////// Critical - sets the critical KnownDataContracts property /// [SecurityCritical] set { helper.KnownDataContracts = value; } } internal XmlSchemaType XsdType { ////// Critical - fetches the critical XsdType property /// Safe - XsdType only needs to be protected for write /// [SecurityCritical, SecurityTreatAsSafe] get { return helper.XsdType; } ////// Critical - sets the critical XsdType property /// [SecurityCritical] set { helper.XsdType = value; } } internal bool IsAnonymous { ////// Critical - fetches the critical IsAnonymous property /// Safe - IsAnonymous only needs to be protected for write /// [SecurityCritical, SecurityTreatAsSafe] get { return helper.IsAnonymous; } } internal override bool HasRoot { ////// Critical - fetches the critical HasRoot property /// Safe - HasRoot only needs to be protected for write /// [SecurityCritical, SecurityTreatAsSafe] get { return helper.HasRoot; } ////// Critical - sets the critical HasRoot property /// [SecurityCritical] set { helper.HasRoot = value; } } internal override XmlDictionaryString TopLevelElementName { ////// Critical - fetches the critical TopLevelElementName property /// Safe - TopLevelElementName only needs to be protected for write /// [SecurityCritical, SecurityTreatAsSafe] get { return helper.TopLevelElementName; } ////// Critical - sets the critical TopLevelElementName property /// [SecurityCritical] set { helper.TopLevelElementName = value; } } internal override XmlDictionaryString TopLevelElementNamespace { ////// Critical - fetches the critical TopLevelElementNamespace property /// Safe - TopLevelElementNamespace only needs to be protected for write /// [SecurityCritical, SecurityTreatAsSafe] get { return helper.TopLevelElementNamespace; } ////// Critical - sets the critical TopLevelElementNamespace property /// [SecurityCritical] set { helper.TopLevelElementNamespace = value; } } internal bool IsTopLevelElementNullable { ////// Critical - fetches the critical IsTopLevelElementNullable property /// Safe - isISerializable only needs to be protected for write /// [SecurityCritical, SecurityTreatAsSafe] get { return helper.IsTopLevelElementNullable; } ////// Critical - sets the critical IsTopLevelElementNullable property /// [SecurityCritical] set { helper.IsTopLevelElementNullable = value; } } internal bool IsTypeDefinedOnImport { ////// Critical - fetches the critical IsTypeDefinedOnImport property /// Safe - IsTypeDefinedOnImport only needs to be protected for write /// [SecurityCritical, SecurityTreatAsSafe] get { return helper.IsTypeDefinedOnImport; } ////// Critical - sets the critical IsTypeDefinedOnImport property /// [SecurityCritical] set { helper.IsTypeDefinedOnImport = value; } } internal CreateXmlSerializableDelegate CreateXmlSerializableDelegate { ////// Critical - fetches the critical CreateXmlSerializableDelegate property /// Safe - CreateXmlSerializableDelegate only needs to be protected for write; initialized in getter if null /// [SecurityCritical, SecurityTreatAsSafe] get { if (helper.CreateXmlSerializableDelegate == null) { lock (this) { if (helper.CreateXmlSerializableDelegate == null) { CreateXmlSerializableDelegate tempCreateXmlSerializable = GenerateCreateXmlSerializableDelegate(); Thread.MemoryBarrier(); helper.CreateXmlSerializableDelegate = tempCreateXmlSerializable; } } } return helper.CreateXmlSerializableDelegate; } } internal override bool CanContainReferences { get { return false; } } internal override bool IsBuiltInDataContract { get { return UnderlyingType == Globals.TypeOfXmlElement || UnderlyingType == Globals.TypeOfXmlNodeArray; } } ////// Critical - holds all state used for for (de)serializing XML types. /// since the data is cached statically, we lock down access to it. /// [SecurityCritical(SecurityCriticalScope.Everything)] class XmlDataContractCriticalHelper : DataContract.DataContractCriticalHelper { DataContractDictionary knownDataContracts; bool isKnownTypeAttributeChecked; XmlDictionaryString topLevelElementName; XmlDictionaryString topLevelElementNamespace; bool isTopLevelElementNullable; bool isTypeDefinedOnImport; XmlSchemaType xsdType; bool hasRoot; CreateXmlSerializableDelegate createXmlSerializable; internal XmlDataContractCriticalHelper() { } internal XmlDataContractCriticalHelper(Type type) : base(type) { if (type.IsDefined(Globals.TypeOfDataContractAttribute, false)) throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidDataContractException(SR.GetString(SR.IXmlSerializableCannotHaveDataContract, DataContract.GetClrTypeFullName(type)))); if (type.IsDefined(Globals.TypeOfCollectionDataContractAttribute, false)) throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidDataContractException(SR.GetString(SR.IXmlSerializableCannotHaveCollectionDataContract, DataContract.GetClrTypeFullName(type)))); XmlSchemaType xsdType; bool hasRoot; XmlQualifiedName stableName; SchemaExporter.GetXmlTypeInfo(type, out stableName, out xsdType, out hasRoot); this.StableName = stableName; this.XsdType = xsdType; this.HasRoot = hasRoot; XmlDictionary dictionary = new XmlDictionary(); this.Name = dictionary.Add(StableName.Name); this.Namespace = dictionary.Add(StableName.Namespace); object[] xmlRootAttributes = (UnderlyingType == null) ? null : UnderlyingType.GetCustomAttributes(Globals.TypeOfXmlRootAttribute, false); if (xmlRootAttributes == null || xmlRootAttributes.Length == 0) { if (hasRoot) { topLevelElementName = Name; topLevelElementNamespace = (this.StableName.Namespace == Globals.SchemaNamespace) ? DictionaryGlobals.EmptyString : Namespace; isTopLevelElementNullable = true; } } else { if (hasRoot) { XmlRootAttribute xmlRootAttribute = (XmlRootAttribute)xmlRootAttributes[0]; isTopLevelElementNullable = xmlRootAttribute.IsNullable; string elementName = xmlRootAttribute.ElementName; topLevelElementName = (elementName == null || elementName.Length == 0) ? Name : dictionary.Add(DataContract.EncodeLocalName(elementName)); string elementNs = xmlRootAttribute.Namespace; topLevelElementNamespace = (elementNs == null || elementNs.Length == 0) ? DictionaryGlobals.EmptyString : dictionary.Add(elementNs); } else { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidDataContractException(SR.GetString(SR.IsAnyCannotHaveXmlRoot, DataContract.GetClrTypeFullName(UnderlyingType)))); } } } internal override DataContractDictionary KnownDataContracts { get { if (!isKnownTypeAttributeChecked && UnderlyingType != null) { lock (this) { if (!isKnownTypeAttributeChecked) { knownDataContracts = DataContract.ImportKnownTypeAttributes(this.UnderlyingType); Thread.MemoryBarrier(); isKnownTypeAttributeChecked = true; } } } return knownDataContracts; } set { knownDataContracts = value; } } internal XmlSchemaType XsdType { get { return xsdType; } set { xsdType = value; } } internal bool IsAnonymous { get { return xsdType != null; } } internal override bool HasRoot { get { return hasRoot; } set { hasRoot = value; } } internal override XmlDictionaryString TopLevelElementName { get { return topLevelElementName; } set { topLevelElementName = value; } } internal override XmlDictionaryString TopLevelElementNamespace { get { return topLevelElementNamespace; } set { topLevelElementNamespace = value; } } internal bool IsTopLevelElementNullable { get { return isTopLevelElementNullable; } set { isTopLevelElementNullable = value; } } internal bool IsTypeDefinedOnImport { get { return isTypeDefinedOnImport; } set { isTypeDefinedOnImport = value; } } internal CreateXmlSerializableDelegate CreateXmlSerializableDelegate { get { return createXmlSerializable; } set { createXmlSerializable = value; } } } ConstructorInfo GetConstructor() { Type type = UnderlyingType; if (type.IsValueType) return null; ConstructorInfo ctor = type.GetConstructor(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public, null, Globals.EmptyTypeArray, null); if (ctor == null) throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidDataContractException(SR.GetString(SR.IXmlSerializableMustHaveDefaultConstructor, DataContract.GetClrTypeFullName(type)))); return ctor; } ////// Critical - sets critical properties on XmlDataContract /// [SecurityCritical] internal void SetTopLevelElementName(XmlQualifiedName elementName) { if (elementName != null) { XmlDictionary dictionary = new XmlDictionary(); this.TopLevelElementName = dictionary.Add(elementName.Name); this.TopLevelElementNamespace = dictionary.Add(elementName.Namespace); } } ////// Critical - calls CodeGenerator.BeginMethod which is SecurityCritical /// Safe - self-contained: returns the delegate to the generated IL but otherwise all IL generation is self-contained here /// [SecurityCritical, SecurityTreatAsSafe] internal CreateXmlSerializableDelegate GenerateCreateXmlSerializableDelegate() { Type type = this.UnderlyingType; CodeGenerator ilg = new CodeGenerator(); bool memberAccessFlag = RequiresMemberAccessForCreate(null); try { ilg.BeginMethod("Create" + DataContract.GetClrTypeFullName(type), typeof(CreateXmlSerializableDelegate), memberAccessFlag); } catch (SecurityException securityException) { if (memberAccessFlag && securityException.PermissionType.Equals(typeof(ReflectionPermission))) { RequiresMemberAccessForCreate(securityException); } else { throw; } } if (type.IsValueType) { System.Reflection.Emit.LocalBuilder local = ilg.DeclareLocal(type, type.Name + "Value"); ilg.Ldloca(local); ilg.InitObj(type); ilg.Ldloc(local); } else { ilg.New(GetConstructor()); } ilg.ConvertValue(this.UnderlyingType, Globals.TypeOfIXmlSerializable); ilg.Ret(); return (CreateXmlSerializableDelegate)ilg.EndMethod(); } ////// Review - calculates whether this Xml type requires MemberAccessPermission for deserialization. /// since this information is used to determine whether to give the generated code access /// permissions to private members, any changes to the logic should be reviewed. /// [SecurityRequiresReview] bool RequiresMemberAccessForCreate(SecurityException securityException) { if (!IsTypeVisible(UnderlyingType)) { if (securityException != null) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError( new SecurityException(SR.GetString(SR.PartialTrustIXmlSerializableTypeNotPublic, DataContract.GetClrTypeFullName(UnderlyingType)), securityException)); } return true; } if (ConstructorRequiresMemberAccess(GetConstructor())) { if (securityException != null) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError( new SecurityException(SR.GetString(SR.PartialTrustIXmlSerialzableNoPublicConstructor, DataContract.GetClrTypeFullName(UnderlyingType)), securityException)); } return true; } return false; } internal override bool Equals(object other, DictionarycheckedContracts) { if (IsEqualOrChecked(other, checkedContracts)) return true; XmlDataContract dataContract = other as XmlDataContract; if (dataContract != null) { if (this.HasRoot != dataContract.HasRoot) return false; if (this.IsAnonymous) { return dataContract.IsAnonymous; } else { return (StableName.Name == dataContract.StableName.Name && StableName.Namespace == dataContract.StableName.Namespace); } } return false; } public override int GetHashCode() { return base.GetHashCode(); } public override void WriteXmlValue(XmlWriterDelegator xmlWriter, object obj, XmlObjectSerializerWriteContext context) { if (context == null) XmlObjectSerializerWriteContext.WriteRootIXmlSerializable(xmlWriter, obj); else context.WriteIXmlSerializable(xmlWriter, obj); } public override object ReadXmlValue(XmlReaderDelegator xmlReader, XmlObjectSerializerReadContext context) { object o; if (context == null) { o = XmlObjectSerializerReadContext.ReadRootIXmlSerializable(xmlReader, this, true /*isMemberType*/); } else { o = context.ReadIXmlSerializable(xmlReader, this, true /*isMemberType*/); context.AddNewObject(o); } xmlReader.ReadEndElement(); return o; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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