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BlogHelpers.cs
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BlogHelpers.cs
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namespace SimpleBlogDemo.Helpers
{
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Threading.Tasks;
using System.Web;
using System.Web.Mvc;
using Dropbox.Api;
using Dropbox.Api.Files;
using SimpleBlogDemo.Models;
public static class BlogHelpers
{
private static Dictionary<string, Article> ArticleCache = new Dictionary<string, Article>();
public static async Task<Article> GetArticle(this DropboxClient client, string blogName, ArticleMetadata metadata, bool bypassCache = false)
{
if (metadata == null || string.IsNullOrEmpty(blogName))
{
return null;
}
var key = string.Format(CultureInfo.InvariantCulture, "{0}:{1}", blogName, metadata.Name);
Article article;
if (!bypassCache)
{
lock (ArticleCache)
{
if (ArticleCache.TryGetValue(key, out article))
{
if (article.Metadata.Rev == metadata.Rev)
{
return article;
}
}
}
}
try
{
using (var download = await client.Files.DownloadAsync("/" + metadata.Filename))
{
var content = await download.GetContentAsStringAsync();
var html = content.ParseMarkdown();
article = Article.FromMetadata(download.Response, html);
}
}
catch (ApiException<DownloadError> e)
{
var pathError = e.ErrorResponse.AsPath;
if (pathError != null && pathError.Value.IsNotFile)
{
return null;
}
throw;
}
lock (ArticleCache)
{
ArticleCache[key] = article;
}
return article;
}
public static void FlushCache(this ControllerBase controller, string blogName)
{
var prefix = blogName + ":";
lock (ArticleCache)
{
var keys = from k in ArticleCache.Keys
where k.StartsWith(prefix)
select k;
foreach (var key in keys)
{
ArticleCache.Remove(key);
}
}
}
public static async Task<IEnumerable<ArticleMetadata>> GetArticleList(this DropboxClient client)
{
var list = await client.Files.ListFolderAsync(string.Empty);
var articles = new List<ArticleMetadata>();
foreach (var item in list.Entries)
{
if (!item.IsFile)
{
continue;
}
var fileMetadata = item.AsFile;
var metadata = ArticleMetadata.Parse(item.Name, fileMetadata.Rev);
if (metadata != null)
{
articles.Add(metadata);
}
}
articles.Sort((l, r) => l.Date.CompareTo(r.Date));
return articles;
}
public static Tuple<string, DateTime, string> ParseBlogFileName(this string filename)
{
var elements = filename.Split('.');
if (elements.Length != 3 || elements[2] != "md" || elements[1].Length != 8)
{
return null;
}
var name = elements[0];
ulong dateInteger;
if (!ulong.TryParse(elements[1], out dateInteger))
{
return null;
}
int year = (int)(dateInteger / 10000);
int month = (int)((dateInteger / 100) % 100);
int day = (int)(dateInteger % 100);
if (month < 1 || month > 12 || day < 1 || day > 31)
{
return null;
}
var date = new DateTime(year, month, day);
return Tuple.Create(
elements[0],
date,
string.Format(CultureInfo.InvariantCulture, "{0}-{1:yyyy-MM-dd}", elements[0], date));
}
}
public class Blog
{
public string BlogName { get; private set; }
public IReadOnlyList<ArticleMetadata> BlogArticles { get; private set; }
public DateTime MostRecent
{
get
{
if (this.BlogArticles.Count == 0)
{
return DateTime.MinValue;
}
return this.BlogArticles.Last().Date;
}
}
public static async Task<Blog> FromUserAsync(UserProfile user)
{
if (string.IsNullOrWhiteSpace(user.BlogName) ||
string.IsNullOrWhiteSpace(user.DropboxAccessToken))
{
return null;
}
using (var client = new DropboxClient(user.DropboxAccessToken, new DropboxClientConfig("SimpleBlogDemo")))
{
return new Blog
{
BlogName = user.BlogName,
BlogArticles = new List<ArticleMetadata>(await client.GetArticleList()).AsReadOnly()
};
}
}
}
public class ArticleMetadata
{
public string Name { get; private set; }
public string DisplayName { get; private set; }
public string Rev { get; private set; }
public DateTime Date { get; private set; }
public string Filename
{
get
{
return string.Format(
CultureInfo.InvariantCulture,
"{0}.{1:yyyyMMdd}.md",
this.Name,
this.Date);
}
}
public static ArticleMetadata Parse(string filename, string rev)
{
var parsed = filename.ParseBlogFileName();
if (parsed == null)
{
return null;
}
return new ArticleMetadata
{
Name = parsed.Item1,
Date = parsed.Item2,
DisplayName = parsed.Item3,
Rev = rev
};
}
}
public class Article
{
public Article(string name, ArticleMetadata metadata, HtmlString content)
{
this.Name = name;
this.Metadata = metadata;
this.Content = content;
}
public string Name { get; private set; }
public ArticleMetadata Metadata { get; private set; }
public HtmlString Content { get; private set; }
public static Article FromMetadata(FileMetadata metadata, HtmlString content)
{
var parsed = metadata.Name.ParseBlogFileName();
return new Article(
metadata.Name,
ArticleMetadata.Parse(metadata.Name, metadata.Rev),
content);
}
}
}