84 lines
2.8 KiB
C#
84 lines
2.8 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading.Tasks;
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using CodeHollow.FeedReader;
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namespace RSSBot {
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public class RssBotFeed {
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public readonly string Url;
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public string LastEntry;
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public readonly HashSet<long> Subs = new HashSet<long>();
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public string MainLink { get; private set; }
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public string Title { get; private set; }
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public List<FeedItem> NewEntries { get; private set; }
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public RssBotFeed(string url, string lastEntry = null, HashSet<long> subs = null) {
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Url = url;
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if (!string.IsNullOrWhiteSpace(lastEntry)) {
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LastEntry = lastEntry;
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}
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if (subs != null) {
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Subs = subs;
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}
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}
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public async Task Check() {
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Feed feed = await FeedReader.ReadAsync(Url);
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if (string.IsNullOrWhiteSpace(feed.Link)) {
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throw new Exception("Kein gültiger RSS-Feed.");
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}
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MainLink = feed.Link;
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Title = feed.Title;
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if (feed.Items == null || feed.Items.Count <= 0) return;
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NewEntries = string.IsNullOrWhiteSpace(LastEntry)
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? feed.Items.ToList()
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: GetNewEntries(feed.Items);
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LastEntry = string.IsNullOrWhiteSpace(feed.Items.First().Id)
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? feed.Items.First().Link
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: feed.Items.First().Id;
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}
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private List<FeedItem> GetNewEntries(IEnumerable<FeedItem> entries) {
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List<FeedItem> newEntries = new List<FeedItem>();
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foreach (FeedItem entry in entries) {
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if (!string.IsNullOrWhiteSpace(entry.Id)) {
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if (entry.Id.Equals(LastEntry)) {
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break;
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}
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newEntries.Add(entry);
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} else {
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if (entry.Link.Equals(LastEntry)) {
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break;
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}
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newEntries.Add(entry);
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}
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}
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newEntries.Reverse();
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return newEntries;
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}
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public override string ToString() {
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return $"RSS-Feed: '{Url}'";
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}
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public void Cleanup(long chatId) {
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Subs.Remove(chatId);
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string feedKey = $"{Configuration.RedisHash}:{Url}";
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Configuration.Database.SetRemove($"{feedKey}:subs", chatId);
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// No subscribers, delete all references
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if (Subs.Count != 0 || !Configuration.Database.KeyExists(feedKey)) return;
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Configuration.Database.KeyDelete(feedKey);
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Configuration.Database.KeyDelete($"{feedKey}:subs");
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Configuration.Database.SetRemove($"{Configuration.RedisHash}:feeds", Url);
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}
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}
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}
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