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RssChannelProvider.cs
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RssChannelProvider.cs
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// Copyright (c) Source Tree Solutions, LLC. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
// Author: Joe Audette
// Created: 2016-04-02
// Last Modified: 2018-06-30
//
using cloudscribe.SimpleContent.Models;
using cloudscribe.SimpleContent.Web.Services;
using cloudscribe.Syndication.Models.Rss;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Infrastructure;
using Microsoft.AspNetCore.Mvc.Routing;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Threading;
using System.Threading.Tasks;
namespace cloudscribe.SimpleContent.Syndication
{
public class RssChannelProvider : IChannelProvider
{
public RssChannelProvider(
IProjectService projectService,
IBlogService blogService,
IBlogUrlResolver blogUrlResolver,
IBlogRoutes blogRoutes,
IHttpContextAccessor contextAccessor,
IUrlHelperFactory urlHelperFactory,
IActionContextAccessor actionContextAccesor,
IContentProcessor contentProcessor
)
{
ProjectService = projectService;
BlogService = blogService;
BlogUrlResolver = blogUrlResolver;
ContextAccessor = contextAccessor;
UrlHelperFactory = urlHelperFactory;
ActionContextAccesor = actionContextAccesor;
ContentProcessor = contentProcessor;
BlogRoutes = blogRoutes;
}
protected IUrlHelperFactory UrlHelperFactory { get; private set; }
protected IActionContextAccessor ActionContextAccesor { get; private set; }
protected IHttpContextAccessor ContextAccessor { get; private set; }
protected IProjectService ProjectService { get; private set; }
protected IBlogService BlogService { get; private set; }
protected IBlogRoutes BlogRoutes { get; private set; }
protected IContentProcessor ContentProcessor { get; private set; }
protected IBlogUrlResolver BlogUrlResolver { get; private set; }
public string Name { get; } = "cloudscribe.SimpleContent.Syndication.RssChannelProvider";
public virtual async Task<RssChannel> GetChannel(CancellationToken cancellationToken = default(CancellationToken))
{
var project = await ProjectService.GetCurrentProjectSettings();
if(project == null) { return null; }
var itemsToGet = project.DefaultFeedItems;
var requestedFeedItems = ContextAccessor.HttpContext?.Request.Query["maxItems"].ToString();
if(!string.IsNullOrWhiteSpace(requestedFeedItems))
{
int.TryParse(requestedFeedItems, out itemsToGet);
if(itemsToGet > project.MaxFeedItems) { itemsToGet = project.MaxFeedItems; }
}
var posts = await BlogService.GetRecentPosts(itemsToGet);
if(posts == null) { return null; }
var channel = new RssChannel
{
Title = project.Title,
Copyright = project.CopyrightNotice,
Generator = Name,
RemoteFeedUrl = project.RemoteFeedUrl,
RemoteFeedProcessorUseAgentFragment = project.RemoteFeedProcessorUseAgentFragment
};
if (!string.IsNullOrEmpty(project.Description))
{
channel.Description = project.Description;
}
else
{
// prevent error, channel desc cannot be empty
channel.Description = "Welcome to my blog";
}
if(!string.IsNullOrEmpty(project.ChannelCategoriesCsv))
{
var channelCats = project.ChannelCategoriesCsv.Split(',');
foreach(var cat in channelCats)
{
channel.Categories.Add(new RssCategory(cat));
}
}
var urlHelper = UrlHelperFactory.GetUrlHelper(ActionContextAccesor.ActionContext);
if (!string.IsNullOrEmpty(project.Image))
{
channel.Image.Url = new Uri(urlHelper.Content(project.Image));
}
if(!string.IsNullOrEmpty(project.LanguageCode))
{
channel.Language = new CultureInfo(project.LanguageCode);
}
var baseUrl = string.Concat(
ContextAccessor.HttpContext.Request.Scheme,
"://",
ContextAccessor.HttpContext.Request.Host.ToUriComponent()
);
// asp.net bug? the comments for this method say it returns an absolute fully qualified url but it returns relative
// looking at latest code seems ok so maybe just a bug in rc1
//https://github.com/aspnet/Mvc/blob/dev/src/Microsoft.AspNetCore.Mvc.Core/UrlHelperExtensions.cs
//https://github.com/aspnet/Mvc/blob/dev/src/Microsoft.AspNetCore.Mvc.Core/Routing/UrlHelper.cs
var indexUrl = urlHelper.RouteUrl(BlogRoutes.BlogIndexRouteName);
if(indexUrl == null)
{
indexUrl = urlHelper.Action("Index", "Blog");
}
if (indexUrl.StartsWith("/"))
{
indexUrl = string.Concat(baseUrl, indexUrl);
}
channel.Link = new Uri(indexUrl);
if(!string.IsNullOrEmpty(project.ManagingEditorEmail))
{
channel.ManagingEditor = project.ManagingEditorEmail;
}
if(!string.IsNullOrEmpty(project.ChannelRating))
{
channel.Rating = project.ChannelRating;
}
var feedUrl = string.Concat(
ContextAccessor.HttpContext.Request.Scheme,
"://",
ContextAccessor.HttpContext.Request.Host.ToUriComponent(),
ContextAccessor.HttpContext.Request.PathBase.ToUriComponent(),
ContextAccessor.HttpContext.Request.Path.ToUriComponent(),
ContextAccessor.HttpContext.Request.QueryString.ToUriComponent());
channel.SelfLink = new Uri(feedUrl);
channel.TimeToLive = project.ChannelTimeToLive;
if(!string.IsNullOrEmpty(project.WebmasterEmail))
{
channel.Webmaster = project.WebmasterEmail;
}
DateTime mostRecentPubDate = DateTime.MinValue;
var items = new List<RssItem>();
foreach(var post in posts)
{
if(!post.PubDate.HasValue) { continue; }
if(post.PubDate.Value > mostRecentPubDate) { mostRecentPubDate = post.PubDate.Value; }
var rssItem = new RssItem
{
Author = post.Author
};
if (post.Categories.Count > 0)
{
foreach(var c in post.Categories)
{
rssItem.Categories.Add(new RssCategory(c));
}
}
var postUrl = await BlogUrlResolver.ResolvePostUrl(post, project).ConfigureAwait(false);
if (string.IsNullOrEmpty(postUrl))
{
//TODO: log
continue;
}
if (postUrl.StartsWith("/"))
{
//postUrl = urlHelper.Content(postUrl);
postUrl = string.Concat(
ContextAccessor.HttpContext.Request.Scheme,
"://",
ContextAccessor.HttpContext.Request.Host.ToUriComponent(),
postUrl);
}
var filteredResult = ContentProcessor.FilterHtmlForRss(post, project, baseUrl);
rssItem.Description = filteredResult.FilteredContent;
if(!filteredResult.IsFullContent)
{
//TODO: localize
var readMore = " <a href='" + postUrl + "'>...read more</a>";
rssItem.Description += readMore;
}
//rssItem.Enclosures
rssItem.Guid = new RssGuid(postUrl,true);
rssItem.Link = new Uri(postUrl);
rssItem.PublicationDate = post.PubDate.Value;
//rssItem.Source
rssItem.Title = post.Title;
items.Add(rssItem);
}
channel.PublicationDate = mostRecentPubDate;
channel.Items = items;
return channel;
}
}
}