/mcs/class/System.ServiceModel.Web/System.ServiceModel.Syndication/Rss20ItemFormatter.cs
C# | 664 lines | 551 code | 62 blank | 51 comment | 165 complexity | 1afbd975e7334f0e696969f911ab7c36 MD5 | raw file
Possible License(s): LGPL-2.0, MPL-2.0-no-copyleft-exception, CC-BY-SA-3.0, GPL-2.0, LGPL-2.1
- //
- // Rss20ItemFormatter.cs
- //
- // Author:
- // Atsushi Enomoto <atsushi@ximian.com>
- //
- // Copyright (C) 2007 Novell, Inc (http://www.novell.com)
- //
- // Permission is hereby granted, free of charge, to any person obtaining
- // a copy of this software and associated documentation files (the
- // "Software"), to deal in the Software without restriction, including
- // without limitation the rights to use, copy, modify, merge, publish,
- // distribute, sublicense, and/or sell copies of the Software, and to
- // permit persons to whom the Software is furnished to do so, subject to
- // the following conditions:
- //
- // The above copyright notice and this permission notice shall be
- // included in all copies or substantial portions of the Software.
- //
- // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
- // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
- // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- //
- using System;
- using System.Collections.Generic;
- using System.Collections.ObjectModel;
- using System.Globalization;
- using System.IO;
- using System.Linq;
- using System.Runtime.Serialization;
- using System.Text;
- using System.Xml;
- using System.Xml.Schema;
- using System.Xml.Serialization;
- namespace System.ServiceModel.Syndication
- {
- static class XmlReaderExtensions
- {
- public static bool IsTextNode (this XmlReader r)
- {
- switch (r.NodeType) {
- case XmlNodeType.Text:
- case XmlNodeType.CDATA:
- case XmlNodeType.Whitespace:
- case XmlNodeType.SignificantWhitespace:
- return true;
- }
- return false;
- }
- }
- [XmlRoot ("item", Namespace = "")]
- public class Rss20ItemFormatter : SyndicationItemFormatter, IXmlSerializable
- {
- const string AtomNamespace ="http://www.w3.org/2005/Atom";
- bool ext_atom_serialization, preserve_att_ext = true, preserve_elem_ext = true;
- Type item_type;
- public Rss20ItemFormatter ()
- {
- ext_atom_serialization = true;
- }
- public Rss20ItemFormatter (SyndicationItem itemToWrite)
- : this (itemToWrite, true)
- {
- }
- public Rss20ItemFormatter (SyndicationItem itemToWrite, bool serializeExtensionsAsAtom)
- : base (itemToWrite)
- {
- ext_atom_serialization = serializeExtensionsAsAtom;
- }
- public Rss20ItemFormatter (Type itemTypeToCreate)
- {
- if (itemTypeToCreate == null)
- throw new ArgumentNullException ("itemTypeToCreate");
- item_type = itemTypeToCreate;
- }
- public bool SerializeExtensionsAsAtom {
- get { return ext_atom_serialization; }
- set { ext_atom_serialization = value; }
- }
- protected Type ItemType {
- get { return item_type; }
- }
- public bool PreserveAttributeExtensions {
- get { return preserve_att_ext; }
- set { preserve_att_ext = value; }
- }
- public bool PreserveElementExtensions {
- get { return preserve_elem_ext; }
- set { preserve_elem_ext = value; }
- }
- public override string Version {
- get { return "Rss20"; }
- }
- protected override SyndicationItem CreateItemInstance ()
- {
- return new SyndicationItem ();
- }
- public override bool CanRead (XmlReader reader)
- {
- if (reader == null)
- throw new ArgumentNullException ("reader");
- reader.MoveToContent ();
- return reader.IsStartElement ("item", String.Empty);
- }
- public override void ReadFrom (XmlReader reader)
- {
- if (!CanRead (reader))
- throw new XmlException (String.Format ("Element '{0}' in namespace '{1}' is not accepted by this syndication formatter", reader.LocalName, reader.NamespaceURI));
- ReadXml (reader, true);
- }
- public override void WriteTo (XmlWriter writer)
- {
- WriteXml (writer, true);
- }
- void IXmlSerializable.ReadXml (XmlReader reader)
- {
- ReadXml (reader, false);
- }
- void IXmlSerializable.WriteXml (XmlWriter writer)
- {
- WriteXml (writer, false);
- }
- XmlSchema IXmlSerializable.GetSchema ()
- {
- return null;
- }
- // read
- void ReadXml (XmlReader reader, bool fromSerializable)
- {
- if (reader == null)
- throw new ArgumentNullException ("reader");
-
- SetItem (CreateItemInstance ());
- reader.MoveToContent ();
- if (PreserveAttributeExtensions && reader.MoveToFirstAttribute ()) {
- do {
- if (reader.NamespaceURI == "http://www.w3.org/2000/xmlns/")
- continue;
- if (!TryParseAttribute (reader.LocalName, reader.NamespaceURI, reader.Value, Item, Version))
- Item.AttributeExtensions.Add (new XmlQualifiedName (reader.LocalName, reader.NamespaceURI), reader.Value);
- } while (reader.MoveToNextAttribute ());
- }
- reader.ReadStartElement ();
- for (reader.MoveToContent (); reader.NodeType != XmlNodeType.EndElement; reader.MoveToContent ()) {
- if (reader.NodeType != XmlNodeType.Element)
- throw new XmlException ("Only element node is expected under 'item' element");
- if (reader.NamespaceURI == String.Empty)
- switch (reader.LocalName) {
- case "title":
- Item.Title = ReadTextSyndicationContent (reader);
- continue;
- case "link":
- SyndicationLink l = Item.CreateLink ();
- ReadLink (reader, l);
- Item.Links.Add (l);
- continue;
- case "description":
- Item.Summary = ReadTextSyndicationContent (reader);
- continue;
- case "author":
- SyndicationPerson p = Item.CreatePerson ();
- ReadPerson (reader, p);
- Item.Authors.Add (p);
- continue;
- case "category":
- SyndicationCategory c = Item.CreateCategory ();
- ReadCategory (reader, c);
- Item.Categories.Add (c);
- continue;
- // case "comments": // treated as extension ...
- case "enclosure":
- l = Item.CreateLink ();
- ReadEnclosure (reader, l);
- Item.Links.Add (l);
- continue;
- case "guid":
- Item.AddPermalink (CreateUri (reader.ReadElementContentAsString ()));
- continue;
- case "pubDate":
- // FIXME: somehow DateTimeOffset causes the runtime crash.
- reader.ReadElementContentAsString ();
- // Item.PublishDate = FromRFC822DateString (reader.ReadElementContentAsString ());
- continue;
- case "source":
- Item.SourceFeed = new SyndicationFeed ();
- ReadSourceFeed (reader, Item.SourceFeed);
- continue;
- }
- else if (SerializeExtensionsAsAtom && reader.NamespaceURI == AtomNamespace) {
- switch (reader.LocalName) {
- case "contributor":
- SyndicationPerson p = Item.CreatePerson ();
- ReadPersonAtom10 (reader, p);
- Item.Contributors.Add (p);
- continue;
- case "updated":
- // FIXME: somehow DateTimeOffset causes the runtime crash.
- reader.ReadElementContentAsString ();
- // Item.LastUpdatedTime = XmlConvert.ToDateTimeOffset (reader.ReadElementContentAsString ());
- continue;
- case "rights":
- Item.Copyright = ReadTextSyndicationContent (reader);
- continue;
- case "content":
- if (reader.GetAttribute ("src") != null) {
- Item.Content = new UrlSyndicationContent (CreateUri (reader.GetAttribute ("src")), reader.GetAttribute ("type"));
- reader.Skip ();
- continue;
- }
- switch (reader.GetAttribute ("type")) {
- case "text":
- case "html":
- case "xhtml":
- Item.Content = ReadTextSyndicationContent (reader);
- continue;
- default:
- SyndicationContent content;
- if (!TryParseContent (reader, Item, reader.GetAttribute ("type"), Version, out content))
- Item.Content = new XmlSyndicationContent (reader);
- continue;
- }
- }
- }
- if (!TryParseElement (reader, Item, Version)) {
- if (PreserveElementExtensions)
- // FIXME: what to specify for maxExtensionSize
- LoadElementExtensions (reader, Item, int.MaxValue);
- else
- reader.Skip ();
- }
- }
- reader.ReadEndElement (); // </item>
- }
- TextSyndicationContent ReadTextSyndicationContent (XmlReader reader)
- {
- TextSyndicationContentKind kind = TextSyndicationContentKind.Plaintext;
- switch (reader.GetAttribute ("type")) {
- case "html":
- kind = TextSyndicationContentKind.Html;
- break;
- case "xhtml":
- kind = TextSyndicationContentKind.XHtml;
- break;
- }
- string text = reader.ReadElementContentAsString ();
- TextSyndicationContent t = new TextSyndicationContent (text, kind);
- return t;
- }
- void ReadCategory (XmlReader reader, SyndicationCategory category)
- {
- if (reader.MoveToFirstAttribute ()) {
- do {
- if (reader.NamespaceURI == "http://www.w3.org/2000/xmlns/")
- continue;
- if (reader.NamespaceURI == String.Empty) {
- switch (reader.LocalName) {
- case "domain":
- category.Scheme = reader.Value;
- continue;
- }
- }
- if (PreserveAttributeExtensions)
- if (!TryParseAttribute (reader.LocalName, reader.NamespaceURI, reader.Value, category, Version))
- category.AttributeExtensions.Add (new XmlQualifiedName (reader.LocalName, reader.NamespaceURI), reader.Value);
- } while (reader.MoveToNextAttribute ());
- reader.MoveToElement ();
- }
- if (!reader.IsEmptyElement) {
- reader.Read ();
- for (reader.MoveToContent (); reader.NodeType != XmlNodeType.EndElement; reader.MoveToContent ()) {
- if (reader.IsTextNode ())
- category.Name += reader.Value;
- else if (!TryParseElement (reader, category, Version)) {
- if (PreserveElementExtensions)
- // FIXME: what should be used for maxExtenswionSize
- LoadElementExtensions (reader, category, int.MaxValue);
- else
- reader.Skip ();
- }
- reader.Read ();
- }
- }
- reader.Read (); // </category> or <category ... />
- }
- // SyndicationLink.CreateMediaEnclosureLink() is almost
- // useless here since it cannot handle extension attributes
- // in straightforward way (it I use it, I have to iterate
- // attributes twice just to read extensions).
- void ReadEnclosure (XmlReader reader, SyndicationLink link)
- {
- link.RelationshipType = "enclosure";
- if (PreserveAttributeExtensions && reader.MoveToFirstAttribute ()) {
- do {
- if (reader.NamespaceURI == "http://www.w3.org/2000/xmlns/")
- continue;
- if (reader.NamespaceURI == String.Empty) {
- switch (reader.LocalName) {
- case "url":
- link.Uri = CreateUri (reader.Value);
- continue;
- case "type":
- link.MediaType = reader.Value;
- continue;
- case "length":
- link.Length = XmlConvert.ToInt64 (reader.Value);
- continue;
- }
- }
- if (!TryParseAttribute (reader.LocalName, reader.NamespaceURI, reader.Value, link, Version))
- link.AttributeExtensions.Add (new XmlQualifiedName (reader.LocalName, reader.NamespaceURI), reader.Value);
- } while (reader.MoveToNextAttribute ());
- reader.MoveToElement ();
- }
- // Actually .NET fails to read extension here.
- if (!reader.IsEmptyElement) {
- reader.Read ();
- for (reader.MoveToContent (); reader.NodeType != XmlNodeType.EndElement; reader.MoveToContent ()) {
- if (!TryParseElement (reader, link, Version)) {
- if (PreserveElementExtensions)
- // FIXME: what should be used for maxExtenswionSize
- LoadElementExtensions (reader, link, int.MaxValue);
- else
- reader.Skip ();
- }
- }
- }
- reader.Read (); // </enclosure> or <enclosure ... />
- }
- void ReadLink (XmlReader reader, SyndicationLink link)
- {
- if (PreserveAttributeExtensions && reader.MoveToFirstAttribute ()) {
- do {
- if (reader.NamespaceURI == "http://www.w3.org/2000/xmlns/")
- continue;
- if (!TryParseAttribute (reader.LocalName, reader.NamespaceURI, reader.Value, link, Version))
- link.AttributeExtensions.Add (new XmlQualifiedName (reader.LocalName, reader.NamespaceURI), reader.Value);
- } while (reader.MoveToNextAttribute ());
- reader.MoveToElement ();
- }
- if (!reader.IsEmptyElement) {
- string url = null;
- reader.Read ();
- for (reader.MoveToContent (); reader.NodeType != XmlNodeType.EndElement; reader.MoveToContent ()) {
- if (reader.IsTextNode ())
- url += reader.Value;
- else if (!TryParseElement (reader, link, Version)) {
- if (PreserveElementExtensions)
- // FIXME: what should be used for maxExtenswionSize
- LoadElementExtensions (reader, link, int.MaxValue);
- else
- reader.Skip ();
- }
- reader.Read ();
- }
- link.Uri = CreateUri (url);
- }
- reader.Read (); // </link> or <link ... />
- }
- void ReadPerson (XmlReader reader, SyndicationPerson person)
- {
- if (PreserveAttributeExtensions && reader.MoveToFirstAttribute ()) {
- do {
- if (reader.NamespaceURI == "http://www.w3.org/2000/xmlns/")
- continue;
- if (!TryParseAttribute (reader.LocalName, reader.NamespaceURI, reader.Value, person, Version))
- person.AttributeExtensions.Add (new XmlQualifiedName (reader.LocalName, reader.NamespaceURI), reader.Value);
- } while (reader.MoveToNextAttribute ());
- reader.MoveToElement ();
- }
- if (!reader.IsEmptyElement) {
- reader.Read ();
- for (reader.MoveToContent (); reader.NodeType != XmlNodeType.EndElement; reader.MoveToContent ()) {
- if (reader.IsTextNode ())
- person.Email += reader.Value;
- else if (!TryParseElement (reader, person, Version)) {
- if (PreserveElementExtensions)
- // FIXME: what should be used for maxExtenswionSize
- LoadElementExtensions (reader, person, int.MaxValue);
- else
- reader.Skip ();
- }
- reader.Read ();
- }
- }
- reader.Read (); // end element or empty element
- }
- // copied from Atom10ItemFormatter
- void ReadPersonAtom10 (XmlReader reader, SyndicationPerson person)
- {
- if (reader.MoveToFirstAttribute ()) {
- do {
- if (reader.NamespaceURI == "http://www.w3.org/2000/xmlns/")
- continue;
- if (!TryParseAttribute (reader.LocalName, reader.NamespaceURI, reader.Value, person, Version) && PreserveAttributeExtensions)
- person.AttributeExtensions.Add (new XmlQualifiedName (reader.LocalName, reader.NamespaceURI), reader.Value);
- } while (reader.MoveToNextAttribute ());
- reader.MoveToElement ();
- }
- if (!reader.IsEmptyElement) {
- reader.Read ();
- for (reader.MoveToContent (); reader.NodeType != XmlNodeType.EndElement; reader.MoveToContent ()) {
- if (reader.NodeType == XmlNodeType.Element && reader.NamespaceURI == AtomNamespace) {
- switch (reader.LocalName) {
- case "name":
- person.Name = reader.ReadElementContentAsString ();
- continue;
- case "uri":
- person.Uri = reader.ReadElementContentAsString ();
- continue;
- case "email":
- person.Email = reader.ReadElementContentAsString ();
- continue;
- }
- }
- if (!TryParseElement (reader, person, Version)) {
- if (PreserveElementExtensions)
- // FIXME: what should be used for maxExtenswionSize
- LoadElementExtensions (reader, person, int.MaxValue);
- else
- reader.Skip ();
- }
- }
- }
- reader.Read (); // end element or empty element
- }
- void ReadSourceFeed (XmlReader reader, SyndicationFeed feed)
- {
- if (reader.MoveToFirstAttribute ()) {
- do {
- if (reader.NamespaceURI == "http://www.w3.org/2000/xmlns/")
- continue;
- if (reader.NamespaceURI == String.Empty) {
- switch (reader.LocalName) {
- case "url":
- feed.Links.Add (new SyndicationLink (CreateUri (reader.Value)));
- continue;
- }
- }
- } while (reader.MoveToNextAttribute ());
- reader.MoveToElement ();
- }
- if (!reader.IsEmptyElement) {
- reader.Read ();
- string title = null;
- while (reader.NodeType != XmlNodeType.EndElement) {
- if (reader.IsTextNode ())
- title += reader.Value;
- reader.Skip ();
- reader.MoveToContent ();
- }
- feed.Title = new TextSyndicationContent (title);
- }
- reader.Read (); // </source> or <source ... />
- }
- Uri CreateUri (string uri)
- {
- return new Uri (uri, UriKind.RelativeOrAbsolute);
- }
- // write
- void WriteXml (XmlWriter writer, bool writeRoot)
- {
- if (writer == null)
- throw new ArgumentNullException ("writer");
- if (Item == null)
- throw new InvalidOperationException ("Syndication item must be set before writing");
- if (writeRoot)
- writer.WriteStartElement ("item");
- if (Item.BaseUri != null)
- writer.WriteAttributeString ("xml:base", Item.BaseUri.ToString ());
- WriteAttributeExtensions (writer, Item, Version);
- if (Item.Id != null) {
- writer.WriteStartElement ("guid");
- writer.WriteAttributeString ("isPermaLink", "false");
- writer.WriteString (Item.Id);
- 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);
- }
- }
- }