Allow Transmission users to set a base dir for ftp download url construction; fixes #518

app/src/main/java/org/transdroid/daemon/Daemon.java

@@ -329,7 +329,7 @@ public enum Daemon {
 	}
 
 	public static boolean needsManualPathSpecified(Daemon type) {
-		return type == uTorrent || type == BitTorrent || type == KTorrent || type == BuffaloNas;
+		return type == uTorrent || type == BitTorrent || type == KTorrent || type == BuffaloNas || type == Transmission;
 	}
 
 	public static boolean supportsFilePaths(Daemon type) {

app/src/main/java/org/transdroid/daemon/Transmission/TransmissionAdapter.java

@@ -17,13 +17,14 @@
  */
 package org.transdroid.daemon.Transmission;
 
+import net.iharder.Base64;
+import net.iharder.Base64.InputStream;
+
 import org.apache.http.HttpEntity;
 import org.apache.http.HttpResponse;
 import org.apache.http.client.methods.HttpPost;
 import org.apache.http.entity.StringEntity;
 import org.apache.http.impl.client.DefaultHttpClient;
-import net.iharder.Base64;
-import net.iharder.Base64.InputStream;
 import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
@@ -579,6 +580,18 @@ public class TransmissionAdapter implements IDaemonAdapter {
 
 	private ArrayList<TorrentFile> parseJsonFileList(JSONObject response, Torrent torrent) throws JSONException {
 
+		String absoluteDir = torrent.getLocationDir();
+		String relativeDir = settings.getDownloadDir();
+		if (relativeDir == null) {
+			// We can make no assumptions except the torrent's location is the main download dir
+			relativeDir = "";
+		} else if (absoluteDir.startsWith(relativeDir)) {
+			relativeDir = absoluteDir.substring(relativeDir.length());
+			if (relativeDir.startsWith("/")) {
+				relativeDir = relativeDir.substring(1);
+			}
+		}
+
 		// Parse response
 		ArrayList<TorrentFile> torrentfiles = new ArrayList<>();
 		JSONArray rarray = response.getJSONArray("torrents");
@@ -592,8 +605,8 @@ public class TransmissionAdapter implements IDaemonAdapter {
 				torrentfiles.add(new TorrentFile(
 						String.valueOf(i),
 						file.getString(RPC_FILE_NAME),
-						file.getString(RPC_FILE_NAME),
-						torrent.getLocationDir() + file.getString(RPC_FILE_NAME),
+						relativeDir + file.getString(RPC_FILE_NAME),
+						absoluteDir + file.getString(RPC_FILE_NAME),
 						file.getLong(RPC_FILE_LENGTH),
 						file.getLong(RPC_FILE_COMPLETED),
 						convertTransmissionPriority(stat.getBoolean(RPC_FILESTAT_WANTED), stat.getInt(RPC_FILESTAT_PRIORITY))));