public async Task AddFeedAsync(string feed_url)
{
var found_feed_urls = from url in await FeedReader.GetFeedUrlsFromUrlAsync(feed_url) select url.Url;
if (found_feed_urls.Count() > 0)
{
var blog_url = found_feed_urls.First();
feed_url = blog_url.StartsWith('/') ? $"{feed_url.TrimEnd('/')}{blog_url}" : blog_url;
}
if (Feeds.Any(f => f.FeedLink == feed_url))
{
throw new Exception("There's already a feed with that url.");
}
else
{
var parsed_feed = await FeedReader.ReadAsync(feed_url);
var feed_uri = new Uri(parsed_feed.Link);
var feed_title = string.IsNullOrWhiteSpace(parsed_feed.Title) ? feed_uri.Host : parsed_feed.Title;
var feed_id = AvoidFeedIdCollision(MakeSafeId(feed_title));
string feed_image_path = await DownloadFeedImageAsync(feed_id, parsed_feed.ImageUrl, feed_uri.Host);
var feed = new Feed(feed_id, feed_url)
{
Title = feed_title,
Link = $"{feed_uri.Scheme}://{feed_uri.Host}",
ImagePath = feed_image_path,
DateLastUpdated = parsed_feed.LastUpdatedDate is null ? DateTime.Now : (DateTime)parsed_feed.LastUpdatedDate,
Description = ExtractTextFromHtml(parsed_feed.Description)
};
await WriteToFileAsync(Path.Combine(FeedDirectory, $"{feed_id}.feed"), feed.Serialize());
Directory.CreateDirectory(Path.Combine(FeedDirectory, feed_id));
await AddPostsToFeedAsync(feed, parsed_feed.Items);
Feeds.Add(feed);
}
string AvoidFeedIdCollision(string id)
{
var pre_path = Path.Combine(FeedDirectory, id);
if (Directory.Exists($"{pre_path}.feed"))
{
int suffix = 2;
while (Directory.Exists($"{pre_path}_{suffix}.feed"))
{
suffix++;
}
id = $"{id}_{suffix}";
}
return(id);
}
async Task <string> DownloadFeedImageAsync(string feed_id, string feed_image_url, string feed_host)
{
string feed_image_path = null;
if (string.IsNullOrEmpty(feed_image_url))
{
try
{
var web_client = new WebClient();
web_client.Headers.Add(HttpRequestHeader.UserAgent, "Fidd RSS Reader v1.0");
var favicon_api_response = await web_client.DownloadStringTaskAsync($"http://favicongrabber.com/api/grab/{feed_host}");
var deserialized_response = JsonConvert.DeserializeObject <FaviconGrabberResponse>(favicon_api_response);
if (deserialized_response.Icons.Count > 0)
{
feed_image_url = deserialized_response.Icons.First().Source;
}
} catch (Exception e) {; }
}
if (!string.IsNullOrEmpty(feed_image_url))
{
if (feed_image_url.StartsWith("data:image/"))
{
feed_image_url = feed_image_url.Substring(11);
var image_extension = feed_image_url.Substring(0, feed_image_url.IndexOf(';'));
feed_image_path = $"{feed_id}.{image_extension}";
var image_data_base64 = feed_image_url.Substring(feed_image_url.IndexOf(',') + 1);
await File.WriteAllBytesAsync(Path.Combine(FeedDirectory, feed_image_path), Convert.FromBase64String(image_data_base64));
}
else
{
var downloader = new WebClient();
string image_extension = ExtractExtensionFromUrl(feed_image_url);
feed_image_path = $"{feed_id}{image_extension}";
await downloader.DownloadFileTaskAsync(feed_image_url, Path.Combine(FeedDirectory, feed_image_path));
}
}
return(feed_image_path);
}
}