Add timestamp checking to YouTube feeds

src/main/java/com/fpghoti/biscuit/guild/BiscuitGuild.java

@@ -203,6 +203,7 @@ public class BiscuitGuild {
 		String youTubeChannelURL = "null";
 		String message = "null";
 		String lastVideo = "null";
+		String lastVideoTimestamp = "null";
 
 		Properties prop = new Properties();
 		InputStream input = null;
@@ -221,6 +222,7 @@ public class BiscuitGuild {
 			youTubeChannelURL = prop.getProperty("YouTubeChannelURL");
 			message = prop.getProperty("Message");
 			lastVideo = prop.getProperty("LastVideo");
+			lastVideoTimestamp = prop.getProperty("LastVideoTimestamp");
 		} catch (IOException ex) {
 			ex.printStackTrace();
 		} finally {
@@ -240,6 +242,7 @@ public class BiscuitGuild {
 		}
 		YTFeed feed = new YTFeed(alias, textChannel, youTubeChannelURL, message);
 		feed.setLastVideo(lastVideo);
+		feed.setLastVideoTimestamp(lastVideoTimestamp);
 		return new YTFeedConfig(this, feed);
 	}
 
@@ -273,7 +276,7 @@ public class BiscuitGuild {
 			YTFeedConfig config = ytfeeds.get(s);
 			YTFeed feed = config.getFeed();
 			feed.post();
-			config.setLastPosted(feed.getLastVideo());
+			config.setLastPosted(feed.getLastVideo(), feed.getLastVideoTimestamp());
 		}
 	}
 

src/main/java/com/fpghoti/biscuit/rss/YTEntry.java

@@ -13,10 +13,11 @@ public class YTEntry {
 	private String id;
 	private String title;
 	private String author;
+	private String timestamp;
 	private String description;
 	private String thumbnail;
 	
-	public YTEntry(String id, String title, String author, String description, String thumbnail) {
+	public YTEntry(String id, String title, String author, String timestamp, String description, String thumbnail) {
 		this.id = id;
 		this.title = title;
 		this.author = author;
@@ -36,6 +37,10 @@ public class YTEntry {
 		return author;
 	}
 	
+	public String getTimestamp() {
+		return timestamp;
+	}
+	
 	public String getDescription() {
 		return description;
 	}

src/main/java/com/fpghoti/biscuit/rss/YTFeed.java

@@ -2,6 +2,9 @@ package com.fpghoti.biscuit.rss;
 
 import java.awt.Color;
 import java.io.IOException;
+import java.time.Instant;
+import java.time.OffsetDateTime;
+import java.time.format.DateTimeParseException;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -23,6 +26,7 @@ public class YTFeed {
 	private String channelURL;
 	private String message;
 	private String lastVideo;
+	private String lastVideoTimestamp;
 
 	public YTFeed(String alias, TextChannel channel, String channelURL, String message) {
 		this.guild = BiscuitGuild.getBiscuitGuild(channel.getGuild());
@@ -31,6 +35,7 @@ public class YTFeed {
 		this.channelURL = channelURL;
 		this.message = message;
 		lastVideo = "";
+		lastVideoTimestamp = "";
 	}
 
 	public String getAlias() {
@@ -52,11 +57,23 @@ public class YTFeed {
 	public String getLastVideo() {
 		return lastVideo;
 	}
-
+	
+	public String getLastVideoTimestamp() {
+		return lastVideoTimestamp;
+	}
+	
+	public Instant getLastInstant() {
+		return parseTimestamp(lastVideoTimestamp);
+	}
+	
 	public void setLastVideo(String link) {
 		lastVideo = link;
 	}
 
+	public void setLastVideoTimestamp(String link) {
+		lastVideoTimestamp = link;
+	}
+	
 	public void post(){
 		List<YTEntry> ytentries = getEntries();
 		int index = 0;
@@ -70,9 +87,20 @@ public class YTFeed {
 		}
 		index = 0;
 		for(YTEntry entry : ytentries) {
-			if(index > lastVidIndex) {
+			String timestamp = entry.getTimestamp();
+			Instant entryTimestamp = parseTimestamp(timestamp);
+			if(entryTimestamp == null) {
+				guild.error("Could not retrieve YouTube feed entry timestamp!");
+				return;
+			}
+			if(getLastInstant() == null) {
+				guild.error("Could not retrieve YouTube feed last timestamp!");
+				return;
+			}
+			if(index > lastVidIndex && entryTimestamp.isAfter(getLastInstant())) {
 				String link = entry.getURL();
 				lastVideo = link;
+				lastVideoTimestamp = timestamp;
 				MessageText.send(channel, message);
 				MessageText.send(channel, entry.getEmbedMessage());
 			}
@@ -100,6 +128,7 @@ public class YTFeed {
 				String id = "";
 				String title = "";
 				String author = "";
+				String timestamp = "";
 				String description = "";
 				String thumbnail = "";
 				
@@ -119,6 +148,9 @@ public class YTFeed {
 							}
 						}
 					}
+					if(value.getLocalName().equals("published")) {
+						timestamp = value.getValue();
+					}
 					if(value.getLocalName().equals("group")) {
 						Elements subvalues = value.getChildElements();
 						for(Element subvalue : subvalues) {
@@ -132,12 +164,24 @@ public class YTFeed {
 					}
 				}
 				
-				ytentries.add(new YTEntry(id, title, author, description, thumbnail));
+				ytentries.add(new YTEntry(id, title, author, timestamp, description, thumbnail));
 			}
 		}
 		
 		return ytentries.reversed();
 
 	}
+	
+	private Instant parseTimestamp(String timestamp) {
+	    if (timestamp == null || timestamp.trim().isEmpty()) {
+	        return null;
+	    }
+
+	    try {
+	        return OffsetDateTime.parse(timestamp.trim()).toInstant();
+	    } catch (DateTimeParseException e) {
+	        throw new IllegalArgumentException("Invalid YouTube timestamp: " + timestamp, e);
+	    }
+	}
 
 }

src/main/java/com/fpghoti/biscuit/rss/YTFeedConfig.java

@@ -54,15 +54,17 @@ public class YTFeedConfig {
 	}
 	
 
-	public void setLastPosted(String link) {
+	public void setLastPosted(String link, String timestamp) {
 		PropertiesConfiguration prop = new PropertiesConfiguration();
 		PropertiesConfigurationLayout layout = new PropertiesConfigurationLayout();
 		prop.setLayout(layout);
 		try {
 			layout.load(prop, new FileReader(config));
 			FileWriter fw = new FileWriter(config);
-			prop.setProperty("LastVideo", link);	
+			prop.setProperty("LastVideo", link);
+			prop.setProperty("LastVideoTimestamp", timestamp);
 			feed.setLastVideo(link);
+			feed.setLastVideoTimestamp(timestamp);
 			layout.save(prop, fw);
 		} catch (ConfigurationException e) {
 			e.printStackTrace();
@@ -105,6 +107,7 @@ public class YTFeedConfig {
 		addProperty("YouTubeChannelURL", feed.getChannelURL(), prop);
 		addProperty("Message", feed.getMesage(), prop);
 		addProperty("LastVideo", "", prop);
+		addProperty("LastVideoTimestamp", "", prop);
 	}
 
 	private void addProperty(String key, String value, PropertiesConfiguration prop) {