MetaBot 1.0 (Java IRC Bot + OEmbed)

import java.awt.image.BufferedImage;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.imageio.ImageIO;
import javax.mail.internet.ContentType;
import org.jibble.pircbot.PircBot;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

public class MetaBot extends PircBot {
    private final Pattern urlPattern;

    public MetaBot() throws Exception {
        final Properties properties = new Properties();

        try (final InputStream inputStream = MetaBot.class.getResourceAsStream("/metabot.properties")) {
            properties.load(inputStream);
        }

        final String name = properties.getProperty("metabot.name");
        final String login = properties.getProperty("metabot.login");
        final String version = properties.getProperty("metabot.version");
        final String finger = properties.getProperty("metabot.finger");
        final boolean verbose = Boolean.parseBoolean(properties.getProperty("metabot.verbose"));
        final String hostname = properties.getProperty("metabot.hostname");
        final int port = Integer.parseInt(properties.getProperty("metabot.port"));
        final String[] channels = properties.getProperty("metabot.channels").split(" ");

        this.urlPattern = Pattern.compile("(https?://[^\\s]+)");
        this.setName(name);
        this.setLogin(login);
        this.setVersion(version);
        this.setFinger(finger);
        this.setVerbose(verbose);
        this.connect(hostname, port);

        for (final String channel : channels) {
            this.joinChannel(channel);
        }
    }

    public void onMessage(final String channel, final String sender, final String login, final String hostname, final String message) {
        final String name = this.getName();
        if (message.startsWith(name.concat(",")) || message.startsWith(name.concat(":")) || message.startsWith(name.concat(" "))) {
            final Matcher matcher = this.urlPattern.matcher(message);
            while (matcher.find()) {
                final String match = matcher.group();
                String reply;
                try {
                    if ((match.startsWith("http://twitter.com/") || match.startsWith("https://twitter.com/")) && match.indexOf("status") != -1) {
                        final String url = "http://api.embed.ly/1/oembed?url=" + URLEncoder.encode(match, "UTF-8");
                        final JSONObject object = this.getJSON(url);
                        final String authorName = (String) object.get("author_name");
                        final String description = (String) object.get("description");
                        if (authorName == null || description == null) {
                            throw new Exception();
                        }
                        reply = String.format("%s: %s", authorName, description);
                    } else {
                        final URL url = new URL(match);
                        final URLConnection urlConnection = url.openConnection();
                        try (final InputStream inputStream = urlConnection.getInputStream()) {
                            final String contentTypeString = urlConnection.getContentType();
                            final ContentType contentType = new ContentType(contentTypeString);
                            final String contentTypeMime = contentType.getBaseType();
                            if (contentTypeMime.equals("text/html") || contentTypeMime.equals("application/xhtml+xml")) {
                                final String contentTypeCharset = contentType.getParameter("charset");
                                final Document document = Jsoup.parse(inputStream, contentTypeCharset, match);
                                if (match.startsWith("http://twitter.com/") || match.startsWith("https://twitter.com/")) {
                                    final String author = document.select("h2.username").first().text();
                                    final String tweet = document.select("p.tweet-text").first().text();
                                    reply = String.format("%s: %s", author, tweet);
                                } else {
                                    final Elements elements = document.select("link[type=application/json+oembed]");
                                    if (elements.size() == 1) {
                                        final Element element = elements.first();
                                        final String href = element.attr("href");
                                        final JSONObject object = this.getJSON(href);
                                        final String authorName = (String) object.get("author_name");
                                        final String providerName = (String) object.get("provider_name");
                                        final String title = (String) object.get("title");
                                        final String type = (String) object.get("type");
                                        reply = String.format("%s %s by %s: %s", providerName, type, authorName, title);
                                    } else {
                                        reply = document.title();
                                    }
                                }
                            } else if (contentTypeMime.equals("image/png") || contentTypeMime.equals("image/jpeg")) {
                                final BufferedImage bufferedImage = ImageIO.read(inputStream);
                                final int width = bufferedImage.getWidth();
                                final int height = bufferedImage.getHeight();
                                reply = String.format("Image of type %s with size %sx%s", contentTypeMime, width, height);
                            } else {
                                reply = "Unknown content type.";
                            }
                        }
                    }
                } catch (final Exception exception) {
                    reply = "Could not retrieve metadata about link.";
                    exception.printStackTrace();
                }
                this.sendMessage(channel, reply);
            }
        }
    }

    private JSONObject getJSON(final String urlString) throws Exception {
        final URL url = new URL(urlString);
        final URLConnection urlConnection = url.openConnection();

        try (
            final InputStream inputStream = urlConnection.getInputStream();
            final InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
        ) {
            final JSONParser parser = new JSONParser();
            final JSONObject object = (JSONObject) parser.parse(inputStreamReader);

            return object;
        }
    }

    public static void main(final String[] args) throws Exception {
        final MetaBot metaBot = new MetaBot();
    }
}