Added ripper for Gelbooru.com

src/main/java/com/rarchives/ripme/ripper/rippers/GelbooruRipper.java

@@ -0,0 +1,96 @@
+package com.rarchives.ripme.ripper.rippers;
+
+import com.rarchives.ripme.ripper.AbstractHTMLRipper;
+import com.rarchives.ripme.utils.Http;
+import com.rarchives.ripme.utils.Utils;
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import org.apache.log4j.Logger;
+import org.jsoup.nodes.Document;
+import org.jsoup.nodes.Element;
+
+public class GelbooruRipper extends AbstractHTMLRipper {
+    private static final Logger logger = Logger.getLogger(XbooruRipper.class);
+
+    private static Pattern gidPattern = null;
+
+    public GelbooruRipper(URL url) throws IOException {
+        super(url);
+    }
+
+    @Override
+    public String getDomain() {
+        return "gelbooru.com";
+    }
+
+    @Override
+    public String getHost() {
+        return "gelbooru";
+    }
+
+    private String getPage(int num) throws MalformedURLException {
+        return "https://gelbooru.com/index.php?page=dapi&s=post&q=index&pid=" + num + "&tags=" + getTerm(url);
+    }
+
+    @Override
+    public Document getFirstPage() throws IOException {
+        return Http.url(getPage(0)).get();
+    }
+
+    @Override
+    public Document getNextPage(Document doc) throws IOException {
+        int offset = Integer.parseInt(doc.getElementsByTag("posts").first().attr("offset"));
+        int num = Integer.parseInt(doc.getElementsByTag("posts").first().attr("count"));
+
+        if (offset + 100 > num) {
+            return null;
+        }
+
+        return Http.url(getPage(offset / 100 + 1)).get();
+    }
+
+    @Override
+    public List<String> getURLsFromPage(Document page) {
+        List<String> res = new ArrayList<>(100);
+        for (Element e : page.getElementsByTag("post")) {
+            res.add(e.absUrl("file_url") + "#" + e.attr("id"));
+        }
+        return res;
+    }
+
+    @Override
+    public void downloadURL(URL url, int index) {
+        addURLToDownload(url, Utils.getConfigBoolean("download.save_order", true) ? url.getRef() + "-" : "");
+    }
+
+    private String getTerm(URL url) throws MalformedURLException {
+        if (gidPattern == null) {
+            gidPattern = Pattern.compile("^https?://(www\\.)?gelbooru\\.com/(index.php)?.*([?&]tags=([a-zA-Z0-9$_.+!*'(),%-]+))(&|(#.*)?$)");
+        }
+
+        Matcher m = gidPattern.matcher(url.toExternalForm());
+        if (m.matches()) {
+            return m.group(4);
+        }
+
+        throw new MalformedURLException("Expected gelbooru.com URL format: gelbooru.com/index.php?tags=searchterm - got " + url + " instead");
+    }
+
+    @Override
+    public String getGID(URL url) throws MalformedURLException {
+        try {
+            return Utils.filesystemSafe(new URI(getTerm(url)).getPath());
+        } catch (URISyntaxException ex) {
+            logger.error(ex);
+        }
+
+        throw new MalformedURLException("Expected gelbooru.com URL format: xbooru.com/index.php?tags=searchterm - got " + url + " instead");
+    }
+}