664 lines
21 KiB
C#
664 lines
21 KiB
C#
//
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// Rss20ItemFormatter.cs
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//
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// Author:
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// Atsushi Enomoto <atsushi@ximian.com>
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//
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// Copyright (C) 2007 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Globalization;
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using System.IO;
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using System.Linq;
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using System.Runtime.Serialization;
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using System.Text;
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using System.Xml;
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using System.Xml.Schema;
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using System.Xml.Serialization;
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namespace System.ServiceModel.Syndication
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{
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static class XmlReaderExtensions
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{
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public static bool IsTextNode (this XmlReader r)
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{
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switch (r.NodeType) {
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case XmlNodeType.Text:
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case XmlNodeType.CDATA:
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case XmlNodeType.Whitespace:
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case XmlNodeType.SignificantWhitespace:
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return true;
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}
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return false;
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}
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}
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[XmlRoot ("item", Namespace = "")]
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public class Rss20ItemFormatter : SyndicationItemFormatter, IXmlSerializable
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{
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const string AtomNamespace ="http://www.w3.org/2005/Atom";
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bool ext_atom_serialization, preserve_att_ext = true, preserve_elem_ext = true;
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Type item_type;
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public Rss20ItemFormatter ()
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{
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ext_atom_serialization = true;
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}
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public Rss20ItemFormatter (SyndicationItem itemToWrite)
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: this (itemToWrite, true)
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{
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}
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public Rss20ItemFormatter (SyndicationItem itemToWrite, bool serializeExtensionsAsAtom)
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: base (itemToWrite)
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{
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ext_atom_serialization = serializeExtensionsAsAtom;
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}
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public Rss20ItemFormatter (Type itemTypeToCreate)
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{
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if (itemTypeToCreate == null)
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throw new ArgumentNullException ("itemTypeToCreate");
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item_type = itemTypeToCreate;
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}
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public bool SerializeExtensionsAsAtom {
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get { return ext_atom_serialization; }
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set { ext_atom_serialization = value; }
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}
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protected Type ItemType {
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get { return item_type; }
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}
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public bool PreserveAttributeExtensions {
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get { return preserve_att_ext; }
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set { preserve_att_ext = value; }
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}
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public bool PreserveElementExtensions {
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get { return preserve_elem_ext; }
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set { preserve_elem_ext = value; }
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}
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public override string Version {
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get { return "Rss20"; }
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}
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protected override SyndicationItem CreateItemInstance ()
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{
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return new SyndicationItem ();
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}
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public override bool CanRead (XmlReader reader)
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{
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if (reader == null)
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throw new ArgumentNullException ("reader");
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reader.MoveToContent ();
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return reader.IsStartElement ("item", String.Empty);
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}
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public override void ReadFrom (XmlReader reader)
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{
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if (!CanRead (reader))
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throw new XmlException (String.Format ("Element '{0}' in namespace '{1}' is not accepted by this syndication formatter", reader.LocalName, reader.NamespaceURI));
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ReadXml (reader, true);
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}
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public override void WriteTo (XmlWriter writer)
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{
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WriteXml (writer, true);
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}
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void IXmlSerializable.ReadXml (XmlReader reader)
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{
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ReadXml (reader, false);
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}
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void IXmlSerializable.WriteXml (XmlWriter writer)
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{
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WriteXml (writer, false);
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}
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XmlSchema IXmlSerializable.GetSchema ()
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{
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return null;
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}
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// read
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void ReadXml (XmlReader reader, bool fromSerializable)
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{
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if (reader == null)
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throw new ArgumentNullException ("reader");
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SetItem (CreateItemInstance ());
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reader.MoveToContent ();
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if (PreserveAttributeExtensions && reader.MoveToFirstAttribute ()) {
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do {
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if (reader.NamespaceURI == "http://www.w3.org/2000/xmlns/")
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continue;
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if (!TryParseAttribute (reader.LocalName, reader.NamespaceURI, reader.Value, Item, Version))
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Item.AttributeExtensions.Add (new XmlQualifiedName (reader.LocalName, reader.NamespaceURI), reader.Value);
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} while (reader.MoveToNextAttribute ());
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}
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reader.ReadStartElement ();
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for (reader.MoveToContent (); reader.NodeType != XmlNodeType.EndElement; reader.MoveToContent ()) {
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if (reader.NodeType != XmlNodeType.Element)
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throw new XmlException ("Only element node is expected under 'item' element");
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if (reader.NamespaceURI == String.Empty)
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switch (reader.LocalName) {
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case "title":
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Item.Title = ReadTextSyndicationContent (reader);
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continue;
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case "link":
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SyndicationLink l = Item.CreateLink ();
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ReadLink (reader, l);
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Item.Links.Add (l);
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continue;
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case "description":
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Item.Summary = ReadTextSyndicationContent (reader);
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continue;
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case "author":
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SyndicationPerson p = Item.CreatePerson ();
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ReadPerson (reader, p);
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Item.Authors.Add (p);
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continue;
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case "category":
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SyndicationCategory c = Item.CreateCategory ();
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ReadCategory (reader, c);
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Item.Categories.Add (c);
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continue;
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// case "comments": // treated as extension ...
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case "enclosure":
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l = Item.CreateLink ();
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ReadEnclosure (reader, l);
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Item.Links.Add (l);
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continue;
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case "guid":
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if (reader.GetAttribute ("isPermaLink") == "true")
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Item.AddPermalink (CreateUri (reader.ReadElementContentAsString ()));
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else
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Item.Id = reader.ReadElementContentAsString ();
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continue;
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case "pubDate":
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Item.PublishDate = FromRFC822DateString (reader.ReadElementContentAsString ());
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continue;
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case "source":
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Item.SourceFeed = new SyndicationFeed ();
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ReadSourceFeed (reader, Item.SourceFeed);
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continue;
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}
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else if (SerializeExtensionsAsAtom && reader.NamespaceURI == AtomNamespace) {
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switch (reader.LocalName) {
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case "contributor":
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SyndicationPerson p = Item.CreatePerson ();
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ReadPersonAtom10 (reader, p);
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Item.Contributors.Add (p);
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continue;
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case "updated":
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Item.LastUpdatedTime = XmlConvert.ToDateTimeOffset (reader.ReadElementContentAsString ());
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continue;
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case "rights":
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Item.Copyright = ReadTextSyndicationContent (reader);
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continue;
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case "content":
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if (reader.GetAttribute ("src") != null) {
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Item.Content = new UrlSyndicationContent (CreateUri (reader.GetAttribute ("src")), reader.GetAttribute ("type"));
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reader.Skip ();
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continue;
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}
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switch (reader.GetAttribute ("type")) {
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case "text":
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case "html":
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case "xhtml":
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Item.Content = ReadTextSyndicationContent (reader);
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continue;
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default:
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SyndicationContent content;
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if (!TryParseContent (reader, Item, reader.GetAttribute ("type"), Version, out content))
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Item.Content = new XmlSyndicationContent (reader);
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continue;
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}
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}
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}
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if (!TryParseElement (reader, Item, Version)) {
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if (PreserveElementExtensions)
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// FIXME: what to specify for maxExtensionSize
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LoadElementExtensions (reader, Item, int.MaxValue);
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else
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reader.Skip ();
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}
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}
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reader.ReadEndElement (); // </item>
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}
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TextSyndicationContent ReadTextSyndicationContent (XmlReader reader)
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{
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TextSyndicationContentKind kind = TextSyndicationContentKind.Plaintext;
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switch (reader.GetAttribute ("type")) {
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case "html":
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kind = TextSyndicationContentKind.Html;
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break;
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case "xhtml":
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kind = TextSyndicationContentKind.XHtml;
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break;
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}
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string text = reader.ReadElementContentAsString ();
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TextSyndicationContent t = new TextSyndicationContent (text, kind);
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return t;
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}
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void ReadCategory (XmlReader reader, SyndicationCategory category)
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{
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if (reader.MoveToFirstAttribute ()) {
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do {
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if (reader.NamespaceURI == "http://www.w3.org/2000/xmlns/")
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continue;
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if (reader.NamespaceURI == String.Empty) {
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switch (reader.LocalName) {
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case "domain":
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category.Scheme = reader.Value;
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continue;
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}
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}
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if (PreserveAttributeExtensions)
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if (!TryParseAttribute (reader.LocalName, reader.NamespaceURI, reader.Value, category, Version))
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category.AttributeExtensions.Add (new XmlQualifiedName (reader.LocalName, reader.NamespaceURI), reader.Value);
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} while (reader.MoveToNextAttribute ());
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reader.MoveToElement ();
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}
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if (!reader.IsEmptyElement) {
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reader.Read ();
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for (reader.MoveToContent (); reader.NodeType != XmlNodeType.EndElement; reader.MoveToContent ()) {
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if (reader.IsTextNode ())
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category.Name += reader.Value;
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else if (!TryParseElement (reader, category, Version)) {
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if (PreserveElementExtensions)
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// FIXME: what should be used for maxExtenswionSize
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LoadElementExtensions (reader, category, int.MaxValue);
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else
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reader.Skip ();
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}
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reader.Read ();
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}
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}
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reader.Read (); // </category> or <category ... />
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}
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// SyndicationLink.CreateMediaEnclosureLink() is almost
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// useless here since it cannot handle extension attributes
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// in straightforward way (it I use it, I have to iterate
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// attributes twice just to read extensions).
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void ReadEnclosure (XmlReader reader, SyndicationLink link)
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{
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link.RelationshipType = "enclosure";
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if (PreserveAttributeExtensions && reader.MoveToFirstAttribute ()) {
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do {
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if (reader.NamespaceURI == "http://www.w3.org/2000/xmlns/")
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continue;
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if (reader.NamespaceURI == String.Empty) {
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switch (reader.LocalName) {
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case "url":
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link.Uri = CreateUri (reader.Value);
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continue;
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case "type":
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link.MediaType = reader.Value;
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continue;
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case "length":
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link.Length = XmlConvert.ToInt64 (reader.Value);
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continue;
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}
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}
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if (!TryParseAttribute (reader.LocalName, reader.NamespaceURI, reader.Value, link, Version))
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link.AttributeExtensions.Add (new XmlQualifiedName (reader.LocalName, reader.NamespaceURI), reader.Value);
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} while (reader.MoveToNextAttribute ());
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reader.MoveToElement ();
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}
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// Actually .NET fails to read extension here.
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if (!reader.IsEmptyElement) {
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reader.Read ();
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for (reader.MoveToContent (); reader.NodeType != XmlNodeType.EndElement; reader.MoveToContent ()) {
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if (!TryParseElement (reader, link, Version)) {
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if (PreserveElementExtensions)
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// FIXME: what should be used for maxExtenswionSize
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LoadElementExtensions (reader, link, int.MaxValue);
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else
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reader.Skip ();
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}
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}
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}
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reader.Read (); // </enclosure> or <enclosure ... />
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}
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void ReadLink (XmlReader reader, SyndicationLink link)
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{
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if (PreserveAttributeExtensions && reader.MoveToFirstAttribute ()) {
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do {
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if (reader.NamespaceURI == "http://www.w3.org/2000/xmlns/")
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continue;
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if (!TryParseAttribute (reader.LocalName, reader.NamespaceURI, reader.Value, link, Version))
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link.AttributeExtensions.Add (new XmlQualifiedName (reader.LocalName, reader.NamespaceURI), reader.Value);
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} while (reader.MoveToNextAttribute ());
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reader.MoveToElement ();
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}
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if (!reader.IsEmptyElement) {
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string url = null;
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reader.Read ();
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for (reader.MoveToContent (); reader.NodeType != XmlNodeType.EndElement; reader.MoveToContent ()) {
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if (reader.IsTextNode ())
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url += reader.Value;
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else if (!TryParseElement (reader, link, Version)) {
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if (PreserveElementExtensions)
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// FIXME: what should be used for maxExtenswionSize
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LoadElementExtensions (reader, link, int.MaxValue);
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else
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reader.Skip ();
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}
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reader.Read ();
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}
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link.Uri = CreateUri (url);
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}
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reader.Read (); // </link> or <link ... />
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}
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void ReadPerson (XmlReader reader, SyndicationPerson person)
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{
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if (PreserveAttributeExtensions && reader.MoveToFirstAttribute ()) {
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do {
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if (reader.NamespaceURI == "http://www.w3.org/2000/xmlns/")
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continue;
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if (!TryParseAttribute (reader.LocalName, reader.NamespaceURI, reader.Value, person, Version))
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person.AttributeExtensions.Add (new XmlQualifiedName (reader.LocalName, reader.NamespaceURI), reader.Value);
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} while (reader.MoveToNextAttribute ());
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reader.MoveToElement ();
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}
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if (!reader.IsEmptyElement) {
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reader.Read ();
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for (reader.MoveToContent (); reader.NodeType != XmlNodeType.EndElement; reader.MoveToContent ()) {
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if (reader.IsTextNode ())
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person.Email += reader.Value;
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else if (!TryParseElement (reader, person, Version)) {
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if (PreserveElementExtensions)
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// FIXME: what should be used for maxExtenswionSize
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LoadElementExtensions (reader, person, int.MaxValue);
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else
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reader.Skip ();
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}
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reader.Read ();
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}
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}
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reader.Read (); // end element or empty element
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}
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// copied from Atom10ItemFormatter
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void ReadPersonAtom10 (XmlReader reader, SyndicationPerson person)
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{
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if (reader.MoveToFirstAttribute ()) {
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do {
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if (reader.NamespaceURI == "http://www.w3.org/2000/xmlns/")
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continue;
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if (!TryParseAttribute (reader.LocalName, reader.NamespaceURI, reader.Value, person, Version) && PreserveAttributeExtensions)
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person.AttributeExtensions.Add (new XmlQualifiedName (reader.LocalName, reader.NamespaceURI), reader.Value);
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} while (reader.MoveToNextAttribute ());
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reader.MoveToElement ();
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}
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if (!reader.IsEmptyElement) {
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reader.Read ();
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for (reader.MoveToContent (); reader.NodeType != XmlNodeType.EndElement; reader.MoveToContent ()) {
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if (reader.NodeType == XmlNodeType.Element && reader.NamespaceURI == AtomNamespace) {
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switch (reader.LocalName) {
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case "name":
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person.Name = reader.ReadElementContentAsString ();
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continue;
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case "uri":
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person.Uri = reader.ReadElementContentAsString ();
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continue;
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case "email":
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person.Email = reader.ReadElementContentAsString ();
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continue;
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}
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}
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if (!TryParseElement (reader, person, Version)) {
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if (PreserveElementExtensions)
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// FIXME: what should be used for maxExtenswionSize
|
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LoadElementExtensions (reader, person, int.MaxValue);
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else
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reader.Skip ();
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}
|
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}
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}
|
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reader.Read (); // end element or empty element
|
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}
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|
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void ReadSourceFeed (XmlReader reader, SyndicationFeed feed)
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{
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if (reader.MoveToFirstAttribute ()) {
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do {
|
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if (reader.NamespaceURI == "http://www.w3.org/2000/xmlns/")
|
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continue;
|
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if (reader.NamespaceURI == String.Empty) {
|
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switch (reader.LocalName) {
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case "url":
|
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feed.Links.Add (new SyndicationLink (CreateUri (reader.Value)));
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continue;
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}
|
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}
|
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} while (reader.MoveToNextAttribute ());
|
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reader.MoveToElement ();
|
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}
|
|
|
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if (!reader.IsEmptyElement) {
|
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reader.Read ();
|
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string title = null;
|
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while (reader.NodeType != XmlNodeType.EndElement) {
|
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if (reader.IsTextNode ())
|
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title += reader.Value;
|
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reader.Skip ();
|
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reader.MoveToContent ();
|
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}
|
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feed.Title = new TextSyndicationContent (title);
|
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}
|
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reader.Read (); // </source> or <source ... />
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}
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|
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Uri CreateUri (string uri)
|
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{
|
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return new Uri (uri, UriKind.RelativeOrAbsolute);
|
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}
|
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|
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// write
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|
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void WriteXml (XmlWriter writer, bool writeRoot)
|
|
{
|
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if (writer == null)
|
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throw new ArgumentNullException ("writer");
|
|
if (Item == null)
|
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throw new InvalidOperationException ("Syndication item must be set before writing");
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|
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if (writeRoot)
|
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writer.WriteStartElement ("item");
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|
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if (Item.BaseUri != null)
|
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writer.WriteAttributeString ("xml:base", Item.BaseUri.ToString ());
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|
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WriteAttributeExtensions (writer, Item, Version);
|
|
|
|
if (Item.Id != null) {
|
|
writer.WriteStartElement ("guid");
|
|
writer.WriteAttributeString ("isPermaLink", "false");
|
|
writer.WriteString (Item.Id);
|
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writer.WriteEndElement ();
|
|
}
|
|
|
|
if (Item.Title != null) {
|
|
writer.WriteStartElement ("title");
|
|
writer.WriteString (Item.Title.Text);
|
|
writer.WriteEndElement ();
|
|
}
|
|
|
|
foreach (SyndicationPerson author in Item.Authors)
|
|
if (author != null) {
|
|
writer.WriteStartElement ("author");
|
|
WriteAttributeExtensions (writer, author, Version);
|
|
writer.WriteString (author.Email);
|
|
WriteElementExtensions (writer, author, Version);
|
|
writer.WriteEndElement ();
|
|
}
|
|
foreach (SyndicationCategory category in Item.Categories)
|
|
if (category != null) {
|
|
writer.WriteStartElement ("category");
|
|
if (category.Scheme != null)
|
|
writer.WriteAttributeString ("domain", category.Scheme);
|
|
WriteAttributeExtensions (writer, category, Version);
|
|
writer.WriteString (category.Name);
|
|
WriteElementExtensions (writer, category, Version);
|
|
writer.WriteEndElement ();
|
|
}
|
|
|
|
if (Item.Content != null) {
|
|
Item.Content.WriteTo (writer, "description", String.Empty);
|
|
} else if (Item.Summary != null)
|
|
Item.Summary.WriteTo (writer, "description", String.Empty);
|
|
else if (Item.Title == null) { // according to the RSS 2.0 spec, either of title or description must exist.
|
|
writer.WriteStartElement ("description");
|
|
writer.WriteEndElement ();
|
|
}
|
|
|
|
foreach (SyndicationLink link in Item.Links)
|
|
switch (link.RelationshipType) {
|
|
case "enclosure":
|
|
writer.WriteStartElement ("enclosure");
|
|
if (link.Uri != null)
|
|
writer.WriteAttributeString ("uri", link.Uri.ToString ());
|
|
if (link.Length != 0)
|
|
writer.WriteAttributeString ("length", XmlConvert.ToString (link.Length));
|
|
if (link.MediaType != null)
|
|
writer.WriteAttributeString ("type", link.MediaType);
|
|
WriteAttributeExtensions (writer, link, Version);
|
|
WriteElementExtensions (writer, link, Version);
|
|
writer.WriteEndElement ();
|
|
break;
|
|
default:
|
|
writer.WriteStartElement ("link");
|
|
WriteAttributeExtensions (writer, link, Version);
|
|
writer.WriteString (link.Uri != null ? link.Uri.ToString () : String.Empty);
|
|
WriteElementExtensions (writer, link, Version);
|
|
writer.WriteEndElement ();
|
|
break;
|
|
}
|
|
|
|
if (Item.SourceFeed != null) {
|
|
writer.WriteStartElement ("source");
|
|
if (Item.SourceFeed.Links.Count > 0) {
|
|
Uri u = Item.SourceFeed.Links [0].Uri;
|
|
writer.WriteAttributeString ("url", u != null ? u.ToString () : String.Empty);
|
|
}
|
|
writer.WriteString (Item.SourceFeed.Title != null ? Item.SourceFeed.Title.Text : String.Empty);
|
|
writer.WriteEndElement ();
|
|
}
|
|
|
|
if (!Item.PublishDate.Equals (default (DateTimeOffset))) {
|
|
writer.WriteStartElement ("pubDate");
|
|
writer.WriteString (ToRFC822DateString (Item.PublishDate));
|
|
writer.WriteEndElement ();
|
|
}
|
|
|
|
if (SerializeExtensionsAsAtom) {
|
|
foreach (SyndicationPerson contributor in Item.Contributors) {
|
|
if (contributor != null) {
|
|
writer.WriteStartElement ("contributor", AtomNamespace);
|
|
WriteAttributeExtensions (writer, contributor, Version);
|
|
writer.WriteElementString ("name", AtomNamespace, contributor.Name);
|
|
writer.WriteElementString ("uri", AtomNamespace, contributor.Uri);
|
|
writer.WriteElementString ("email", AtomNamespace, contributor.Email);
|
|
WriteElementExtensions (writer, contributor, Version);
|
|
writer.WriteEndElement ();
|
|
}
|
|
}
|
|
|
|
if (!Item.LastUpdatedTime.Equals (default (DateTimeOffset))) {
|
|
writer.WriteStartElement ("updated", AtomNamespace);
|
|
// FIXME: how to handle offset part?
|
|
writer.WriteString (XmlConvert.ToString (Item.LastUpdatedTime.DateTime, XmlDateTimeSerializationMode.Local));
|
|
writer.WriteEndElement ();
|
|
}
|
|
|
|
if (Item.Copyright != null)
|
|
Item.Copyright.WriteTo (writer, "rights", AtomNamespace);
|
|
#if false
|
|
if (Item.Content != null)
|
|
Item.Content.WriteTo (writer, "content", AtomNamespace);
|
|
#endif
|
|
}
|
|
|
|
WriteElementExtensions (writer, Item, Version);
|
|
|
|
if (writeRoot)
|
|
writer.WriteEndElement ();
|
|
}
|
|
|
|
// FIXME: DateTimeOffset.ToString() needs another overload.
|
|
// When it is implemented, just remove ".DateTime" parts below.
|
|
string ToRFC822DateString (DateTimeOffset date)
|
|
{
|
|
switch (date.DateTime.Kind) {
|
|
case DateTimeKind.Utc:
|
|
return date.DateTime.ToString ("ddd, dd MMM yyyy HH:mm:ss 'Z'", DateTimeFormatInfo.InvariantInfo);
|
|
case DateTimeKind.Local:
|
|
StringBuilder sb = new StringBuilder (date.DateTime.ToString ("ddd, dd MMM yyyy HH:mm:ss zzz", DateTimeFormatInfo.InvariantInfo));
|
|
sb.Remove (sb.Length - 3, 1);
|
|
return sb.ToString (); // remove ':' from +hh:mm
|
|
default:
|
|
return date.DateTime.ToString ("ddd, dd MMM yyyy HH:mm:ss", DateTimeFormatInfo.InvariantInfo);
|
|
}
|
|
}
|
|
|
|
string [] rfc822formats = new string [] {
|
|
"ddd, dd MMM yyyy HH:mm:ss 'Z'",
|
|
"ddd, dd MMM yyyy HH:mm:ss zzz",
|
|
"ddd, dd MMM yyyy HH:mm:ss"};
|
|
|
|
// FIXME: DateTimeOffset is still incomplete. When it is done,
|
|
// simplify the code.
|
|
DateTimeOffset FromRFC822DateString (string s)
|
|
{
|
|
return XmlConvert.ToDateTimeOffset (s, rfc822formats);
|
|
}
|
|
}
|
|
}
|