public static async Task<RssChannel> GetRssChannelAsync(string tenant, HttpContext context, string categoryAlias,
int pageNumber)
{
string url = context.Request.Url.DnsSafeHost;
string title = Configuration.Get("BlogTitle", tenant);
string copyright = Configuration.Get("RssCopyrightText", tenant);
int ttl = Configuration.Get("RssTtl", tenant).To<int>();
int limit = Configuration.Get("RssPageSize", tenant).To<int>();
int offset = (pageNumber - 1)*limit;
List<PublishedContentView> contents;
string category = string.Empty;
if (!string.IsNullOrWhiteSpace(categoryAlias))
{
contents =
(await Contents.GetBlogContentsAsync(tenant, categoryAlias, limit, offset).ConfigureAwait(false))
.ToList();
category = contents.Select(x => x.CategoryName).FirstOrDefault();
}
else
{
contents = (await Contents.GetBlogContentsAsync(tenant, limit, offset).ConfigureAwait(false)).ToList();
}
string domain = TenantConvention.GetBaseDomain(new HttpContextWrapper(context), true);
var items = contents.Select(view => new RssItem
{
Title = view.Title,
Description = view.Contents,
Link = UrlHelper.CombineUrl(domain, "/blog/" + view.CategoryAlias + "/" + view.Alias),
Ttl = ttl,
Category = view.CategoryName,
PublishDate = view.PublishOn,
LastBuildDate = view.LastEditedOn
}).ToList();
var channel = new RssChannel
{
Title = title,
Description = "Category: " + category,
Link = UrlHelper.CombineUrl(domain, "/blog"),
Items = items,
Copyright = copyright,
Category = category
};
return channel;
}
public static string Write(RssChannel channel)
{
var xml = new MemoryStream();
var writer = XmlWriter.Create(xml, new XmlWriterSettings
{
Encoding = Encoding.UTF8,
Indent = true
});
writer.WriteStartElement("rss");
writer.WriteAttributeString("version", "2.0");
writer.WriteStartElement("channel");
WriteTag(ref writer, "title", channel.Title);
WriteTag(ref writer, "link", channel.Link);
WriteTag(ref writer, "description", channel.Description);
WriteTag(ref writer, "generator", "Frapid");
WriteTag(ref writer, "copyright", channel.Copyright);
if (!string.IsNullOrWhiteSpace(channel.Category))
{
WriteTag(ref writer, "category", channel.Category);
}
foreach (var item in channel.Items)
{
writer.WriteStartElement("item");
WriteTag(ref writer, "title", item.Title);
WriteTag(ref writer, "link", item.Link);
WriteTag(ref writer, "description", item.Description);
WriteTag(ref writer, "pubDate", item.PublishDate.ToRfc822DateString());
WriteTag(ref writer, "lastBuildDate", item.LastBuildDate.ToRfc822DateString());
WriteTag(ref writer, "category", item.Category);
writer.WriteEndElement();//item
}
writer.WriteEndElement();//channel
writer.WriteEndElement();//rss
writer.Flush();
return Encoding.UTF8.GetString(xml.ToArray());
}
