Fix Target host is not specified with HLS relative urls in m3u8 playlists

main/src/main/java/com/sedmelluq/discord/lavaplayer/container/playlists/HlsStreamSegmentUrlProvider.java

@@ -19,6 +19,7 @@ public class HlsStreamSegmentUrlProvider extends M3uStreamSegmentUrlProvider {
     private volatile String segmentPlaylistUrl;
 
     public HlsStreamSegmentUrlProvider(String streamListUrl, String segmentPlaylistUrl) {
+        super(streamListUrl);
         this.streamListUrl = streamListUrl;
         this.segmentPlaylistUrl = segmentPlaylistUrl;
     }

main/src/main/java/com/sedmelluq/discord/lavaplayer/source/beam/BeamSegmentUrlProvider.java

@@ -28,6 +28,7 @@ public class BeamSegmentUrlProvider extends M3uStreamSegmentUrlProvider {
      * @param channelId Channel ID number.
      */
     public BeamSegmentUrlProvider(String channelId) {
+        super(null);
         this.channelId = channelId;
     }
 

main/src/main/java/com/sedmelluq/discord/lavaplayer/source/stream/M3uStreamSegmentUrlProvider.java

@@ -13,6 +13,7 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.URI;
+import java.net.URISyntaxException;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -29,8 +30,25 @@ public abstract class M3uStreamSegmentUrlProvider {
     private static final long SEGMENT_WAIT_STEP_MS = 200;
     private static final RequestConfig streamingRequestConfig = RequestConfig.custom().setSocketTimeout(5000).setConnectionRequestTimeout(5000).setConnectTimeout(5000).build();
 
+    protected String baseUrl;
     protected SegmentInfo lastSegment;
 
+    protected M3uStreamSegmentUrlProvider() {
+        this(null);
+    }
+
+    protected M3uStreamSegmentUrlProvider(String originUrl) {
+        if (originUrl != null) {
+            if (originUrl.endsWith("/")) {
+                originUrl = originUrl.substring(0, originUrl.length() - 1);
+            }
+
+            this.baseUrl = originUrl.substring(0, originUrl.lastIndexOf("/"));
+        } else {
+            this.baseUrl = null;
+        }
+    }
+
     protected static String createSegmentUrl(String playlistUrl, String segmentName) {
         return URI.create(playlistUrl).resolve(segmentName).toString();
     }
@@ -122,6 +140,20 @@ public InputStream getNextSegmentStream(HttpInterface httpInterface) {
 
     protected abstract HttpUriRequest createSegmentGetRequest(String url);
 
+    protected boolean isAbsoluteUrl(String url) {
+        try {
+            // A URL is considered absolute if we don't have a baseUrl (so cannot convert a relative URL)
+            // or if URI#isAbsolute returns true.
+            return this.baseUrl == null || new URI(url).isAbsolute();
+        } catch (URISyntaxException e) {
+            return false;
+        }
+    }
+
+    protected String getAbsoluteUrl(String url) {
+        return baseUrl + ((url.startsWith("/")) ? url : "/" + url);
+    }
+
     protected List<ChannelStreamInfo> loadChannelStreamsList(String[] lines) {
         ExtendedM3uParser.Line streamInfoLine = null;
 
@@ -133,7 +165,8 @@ protected List<ChannelStreamInfo> loadChannelStreamsList(String[] lines) {
             if (line.isData() && streamInfoLine != null) {
                 String quality = getQualityFromM3uDirective(streamInfoLine);
                 if (quality != null) {
-                    streams.add(new ChannelStreamInfo(quality, line.lineData));
+                    String lineData = line.lineData;
+                    streams.add(new ChannelStreamInfo(quality, isAbsoluteUrl(lineData) ? lineData : getAbsoluteUrl(lineData)));
                 }
 
                 streamInfoLine = null;

main/src/main/java/com/sedmelluq/discord/lavaplayer/source/twitch/TwitchStreamSegmentUrlProvider.java

@@ -35,6 +35,7 @@ public class TwitchStreamSegmentUrlProvider extends M3uStreamSegmentUrlProvider
      * @param manager     Twitch source manager.
      */
     public TwitchStreamSegmentUrlProvider(String channelName, TwitchStreamAudioSourceManager manager) {
+        super(null);
         this.channelName = channelName;
         this.manager = manager;
         this.tokenExpirationTime = -1;