1//------------------------------------------------------------------------------
  2// <copyright company="Tunynet">
  3//     Copyright (c) Tunynet Network Technology Co., Ltd.  All rights reserved.
  4// </copyright> 
  5//------------------------------------------------------------------------------
  6
  7using System;
  8using System.Collections.Generic;
  9using System.Text;
 10using System.Web;
 11using SpaceBuilder.Components;
 12using SpaceBuilder.Blogs.Components;
 13using TunyNet.Utils;
 14using SpaceBuilder.Posts.Permissions;
 15using System.Xml;
 16using System.Text.RegularExpressions;
 17
 18namespace SpaceBuilder.Blogs.Controls
 19...{
 20    /**//// <summary>
 21    /// Summary description for TrackBackHandler.
 22    /// </summary>
 23    public class TrackBackHandler : IHttpHandler
 24    ...{
 25        public TrackBackHandler()
 26        ...{ }
 27
 28        public void ProcessRequest(HttpContext context)
 29        ...{
 30            context.Response.ContentType = "text/xml";
 31            User user = SBContext.Current.User;
 32            int postId = 0;
 33            try
 34            ...{
 35                postId = int.Parse(context.Request.QueryString["postid"]);
 36            }
 37            catch
 38            ...{
 39                trackbackResponse(context, 1, "EntryID is invalid or missing");
 40            }
 41
 42
 43            if (context.Request.HttpMethod == "POST")
 44            ...{
 45                string title = safeParam(context, "title");
 46                string excerpt = safeParam(context, "excerpt");
 47                string url = safeParam(context, "url");
 48                string blog_name = safeParam(context, "blog_name");
 49
 50                if (!ValueHelper.IsNullOrEmpty(excerpt))
 51                    excerpt = HtmlUtils.TrimHtml(excerpt, 250);
 52                try
 53                ...{
 54                    // is the url valid ?
 55                    if (url == "")
 56                        trackbackResponse(context, 1, "no url parameter found, please try harder!");
 57
 58                    string pageTitle = null;
 59
 60                    BlogThread trackedEntry = BlogPosts.GetThread(postId, true);
 61
 62                    if (trackedEntry == null)
 63                        trackbackResponse(context, 2, "The link does not exist");
 64
 65
 66                    Weblog wl = trackedEntry.Section as Weblog;
 67
 68                    Permissions.AccessCheck(wl, Permission.View, user);
 69
 70                    if (!wl.EnableTrackbacks)
 71                    ...{
 72                        trackbackResponse(context, 2, "Trackbacks are not enabled");
 73                        return;
 74                    }
 75
 76                    if (!IsNewTrackBack(trackedEntry, url))
 77                    ...{
 78                        trackbackResponse(context, 2, "Trackbacks already exists");
 79                        return;
 80
 81                    }
 82
 83                    if (trackedEntry != null && !SourceContainsTarget(url, WebUtils.FullPath(BlogUrls.Instance().ShowPost(trackedEntry, wl)), out pageTitle))
 84                    ...{
 85                        trackbackResponse(context, 2, "Sorry couldn't find a relevant link in " + url);
 86                    }
 87
 88                    BlogPost entry = new BlogPost();
 89                    entry.BlogPostType = BlogPostType.Trackback;
 90                    entry.SectionID = wl.SectionID;
 91                    entry.ParentID = postId;
 92                    entry.Subject = title;
 93                    entry.TitleUrl = url;
 94                    entry.TrackBackName = blog_name;
 95                    entry.Body = excerpt;
 96                    entry.IsApproved = true;
 97                    entry.PostDate = DateTime.Now;
 98                    //entry.BloggerTime = DateTime.Now;
 99                    BlogPosts.CreatePost(entry);
100                }
101                catch (System.Threading.ThreadAbortException) ...{ }
102                catch (System.Exception ex)
103                ...{
104                    if (ex.Message != null)
105                        trackbackResponse(context, 0, string.Format("Error occurred while processing Trackback: {0}", ex.Message));
106                    else
107                        trackbackResponse(context, 0, "Unknown error occurred while processing Trackback.");
108                }
109            }
110            else
111            ...{
112                BlogThread entry = BlogPosts.GetThread(postId, true);
113
114                Weblog wl = entry.Section as Weblog;
115                Permissions.AccessCheck(wl, Permission.View, user);
116
117                XmlTextWriter w = new XmlTextWriter(context.Response.Output);
118                w.Formatting = Formatting.Indented;
119
120                w.WriteStartDocument();
121                w.WriteStartElement("response");
122                w.WriteElementString("error", "0");
123                w.WriteStartElement("rss");
124                w.WriteAttributeString("version", "0.91");
125                w.WriteStartElement("channel");
126                w.WriteElementString("title", entry.Subject);
127                w.WriteElementString("link", BlogUrls.Instance().TrackbackPingUrl(postId));
128                w.WriteElementString("description", "");
129                w.WriteElementString("language", "en-us");
130
131                w.WriteEndElement(); // channel
132                w.WriteEndElement(); // rss 
133                w.WriteEndElement(); // response
134                w.WriteEndDocument();
135            }
136
137        }
138
139        public bool IsReusable
140        ...{
141            get ...{ return true; }
142        }
143
144        private void trackbackResponse(HttpContext context, int errNum, string errText)
145        ...{
146            // Log trackback failure messae to the EventLog
147            string message = String.Format("Trackback request received by SpaceBuilder but failed due to one or more reasons. The request URL was [{0}]. Error message returned was: {1}.", context.Request.RawUrl, errText);
148
149            XmlDocument d = new XmlDocument();
150            XmlElement root = d.CreateElement("response");
151            d.AppendChild(root);
152            XmlElement er = d.CreateElement("error");
153            root.AppendChild(er);
154            er.AppendChild(d.CreateTextNode(errNum.ToString()));
155            if (errText != "")
156            ...{
157                XmlElement msg = d.CreateElement("message");
158                root.AppendChild(msg);
159                msg.AppendChild(d.CreateTextNode(errText));
160            }
161            d.Save(context.Response.Output);
162            context.Response.End();
163        }
164
165        private string safeParam(HttpContext context, string pName)
166        ...{
167            if (context.Request.Form[pName] != null)
168                return WebUtils.HtmlEncode(context.Request.Form[pName]);
169            return string.Empty;
170        }
171
172        public static bool SourceContainsTarget(string sURI, string tURI, out string pageTitle)
173        ...{
174            pageTitle = string.Empty;
175            string page = SBRequest.GetPageText(sURI, tURI);
176            if (page == null || page.IndexOf(tURI) < 0)
177                return false;
178
179            string pat = @"<head.*?>.*<title.*?>(.*)</title.*?>.*</head.*?>";
180            Regex reg = new Regex(pat, RegexOptions.IgnoreCase | RegexOptions.Singleline);
181            Match m = reg.Match(page);
182            if (m.Success)
183            ...{
184                pageTitle = HtmlUtils.TrimHtml(m.Result("$1"));
185                return true;
186            }
187
188            return false;
189        }
190
191        protected static bool IsNewTrackBack(BlogThread post, string trackbackUrl)
192        ...{
193            BlogPostSetQuery query = new BlogPostSetQuery();
194            query.PostID = post.PostID;
195            query.ReturnFullThread = true;
196
197            PostSet ps = BlogPosts.GetPostSet(query);
198
199            foreach (BlogPost p in ps.Replies)
200            ...{
201                if ((string.Compare(trackbackUrl, p.TitleUrl, true) == 0) && (p.BlogPostType == BlogPostType.Trackback))
202                    return false;
203            }
204
205            return true;
206        }
207
208
209
210    }
211}
212
213