Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / Mail / ContentDisposition.cs / 1305376 / ContentDisposition.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Net.Mime { using System; using System.Collections; using System.Collections.Specialized; using System.IO; using System.Text; using System.Globalization; using System.Net.Mail; using System.Collections.Generic; public class ContentDisposition { string dispositionType; TrackingValidationObjectDictionary parameters; bool isChanged; bool isPersisted; string disposition; const string creationDate = "creation-date"; const string readDate = "read-date"; const string modificationDate = "modification-date"; const string size = "size"; const string fileName = "filename"; private static readonly TrackingValidationObjectDictionary.ValidateAndParseValue dateParser = new TrackingValidationObjectDictionary.ValidateAndParseValue ((object value) => { // this will throw a FormatException if the value supplied is not a valid SmtpDateTime SmtpDateTime date = new SmtpDateTime(value.ToString()); return date; }); private static readonly TrackingValidationObjectDictionary.ValidateAndParseValue longParser = new TrackingValidationObjectDictionary.ValidateAndParseValue ((object value) => { long longValue; if (!long.TryParse(value.ToString(), NumberStyles.None, CultureInfo.InvariantCulture, out longValue)) { throw new FormatException(SR.GetString(SR.ContentDispositionInvalid)); } return longValue; }); private static readonly IDictionaryvalidators; static ContentDisposition() { validators = new Dictionary (); validators.Add(creationDate, dateParser); validators.Add(modificationDate, dateParser); validators.Add(readDate, dateParser); validators.Add(size, longParser); } public ContentDisposition() { isChanged = true; dispositionType = "attachment"; disposition = dispositionType; // no need to parse disposition since there's nothing to parse } /// /// ctor. /// /// Unparsed header value. public ContentDisposition(string disposition) { if (disposition == null) throw new ArgumentNullException("disposition"); isChanged = true; this.disposition = disposition; ParseValue(); } internal DateTime GetDateParameter(string parameterName) { SmtpDateTime dateValue = ((TrackingValidationObjectDictionary)Parameters).InternalGet(parameterName) as SmtpDateTime; if (dateValue == null) { return DateTime.MinValue; } return dateValue.Date; } ////// Gets the disposition type of the content. /// public string DispositionType { get { return dispositionType; } set { if (value == null) { throw new ArgumentNullException("value"); } if (value == string.Empty) { throw new ArgumentException(SR.GetString(SR.net_emptystringset), "value"); } isChanged = true; dispositionType = value; } } public StringDictionary Parameters { get { if (parameters == null) { parameters = new TrackingValidationObjectDictionary(validators); } return parameters; } } ////// Gets the value of the Filename parameter. /// public string FileName { get { return Parameters[fileName]; } set { if (String.IsNullOrEmpty(value)) { Parameters.Remove(fileName); } else { Parameters[fileName] = value; } } } ////// Gets the value of the Creation-Date parameter. /// public DateTime CreationDate { get { return GetDateParameter(creationDate); } set { SmtpDateTime date = new SmtpDateTime(value); ((TrackingValidationObjectDictionary)Parameters).InternalSet(creationDate, date); } } ////// Gets the value of the Modification-Date parameter. /// public DateTime ModificationDate { get { return GetDateParameter(modificationDate); } set { SmtpDateTime date = new SmtpDateTime(value); ((TrackingValidationObjectDictionary)Parameters).InternalSet(modificationDate, date); } } public bool Inline { get { return (dispositionType == DispositionTypeNames.Inline); } set { isChanged = true; if (value) { dispositionType = DispositionTypeNames.Inline; } else { dispositionType = DispositionTypeNames.Attachment; } } } ////// Gets the value of the Read-Date parameter. /// public DateTime ReadDate { get { return GetDateParameter(readDate); } set { SmtpDateTime date = new SmtpDateTime(value); ((TrackingValidationObjectDictionary)Parameters).InternalSet(readDate, date); } } ////// Gets the value of the Size parameter (-1 if unspecified). /// public long Size { get { object sizeValue = ((TrackingValidationObjectDictionary)Parameters).InternalGet(size); if (sizeValue == null) return -1; else return (long)sizeValue; } set { ((TrackingValidationObjectDictionary)Parameters).InternalSet(size, value); } } internal void Set(string contentDisposition, HeaderCollection headers) { // we don't set ischanged because persistence was already handled // via the headers. disposition = contentDisposition; ParseValue(); headers.InternalSet(MailHeaderInfo.GetString(MailHeaderID.ContentDisposition), ToString()); isPersisted = true; } internal void PersistIfNeeded(HeaderCollection headers, bool forcePersist) { if (IsChanged || !isPersisted || forcePersist) { headers.InternalSet(MailHeaderInfo.GetString(MailHeaderID.ContentDisposition), ToString()); isPersisted = true; } } internal bool IsChanged { get { return (isChanged || parameters != null && parameters.IsChanged); } } public override string ToString() { if (disposition == null || isChanged || parameters != null && parameters.IsChanged) { StringBuilder builder = new StringBuilder(); builder.Append(dispositionType); foreach (string key in Parameters.Keys) { builder.Append("; "); builder.Append(key); builder.Append('='); MailBnfHelper.GetTokenOrQuotedString(parameters[key], builder); } disposition = builder.ToString(); isChanged = false; parameters.IsChanged = false; isPersisted = false; } return disposition; } public override bool Equals(object rparam) { if (rparam == null) { return false; } return (String.Compare(ToString(), rparam.ToString(), StringComparison.OrdinalIgnoreCase) == 0); } public override int GetHashCode() { return ToString().GetHashCode(); } void ParseValue() { int offset = 0; try { // the disposition MUST be the first parameter in the string dispositionType = MailBnfHelper.ReadToken(disposition, ref offset, null); // disposition MUST not be empty if (String.IsNullOrEmpty(dispositionType)) { throw new FormatException(SR.GetString(SR.MailHeaderFieldMalformedHeader)); } // now we know that there are parameters so we must initialize or clear // and parse if (parameters == null) { parameters = new TrackingValidationObjectDictionary(validators); } else { parameters.Clear(); } while (MailBnfHelper.SkipCFWS(disposition, ref offset)) { // ensure that the separator charactor is present if (disposition[offset++] != ';') throw new FormatException(SR.GetString(SR.MailHeaderFieldInvalidCharacter, disposition[offset-1])); // skip whitespace and see if there's anything left to parse or if we're done if (!MailBnfHelper.SkipCFWS(disposition, ref offset)) break; string paramAttribute = MailBnfHelper.ReadParameterAttribute(disposition, ref offset, null); string paramValue; // verify the next character after the parameter is correct if (disposition[offset++] != '=') { throw new FormatException(SR.GetString(SR.MailHeaderFieldMalformedHeader)); } if (!MailBnfHelper.SkipCFWS(disposition, ref offset)) { // parameter was at end of string and has no value // this is not valid throw new FormatException(SR.GetString(SR.ContentDispositionInvalid)); } if (disposition[offset] == '"') { paramValue = MailBnfHelper.ReadQuotedString(disposition, ref offset, null); } else { paramValue = MailBnfHelper.ReadToken(disposition, ref offset, null); } // paramValue could potentially still be empty if it was a valid quoted string that // contained no inner value. this is invalid if (String.IsNullOrEmpty(paramAttribute) || string.IsNullOrEmpty(paramValue)) { throw new FormatException(SR.GetString(SR.ContentDispositionInvalid)); } // if validation is needed, the parameters dictionary will have a validator registered // for the parameter that is being set so no additional formatting checks are needed here Parameters.Add(paramAttribute, paramValue); } } catch (FormatException exception) { // it's possible that something in MailBNFHelper could throw so ensure that we catch it and wrap it // so that the exception has the correct text throw new FormatException(SR.GetString(SR.ContentDispositionInvalid), exception); } parameters.IsChanged = false; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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