Merge pull request #163 from Stypox/youtube-url-signature-fix

Fix invalid yt url: signature tag name is not always "signature"

Author: TobiGr

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeStreamExtractor.java

@@ -888,7 +888,13 @@ private Map<String, ItagItem> getItags(String encodedUrlMapKey, ItagItem.ItagTyp
                         String streamUrl = tags.get("url");
                         // if video has a signature: decrypt it and add it to the url
                         if (tags.get("s") != null) {
-                            streamUrl = streamUrl + "&signature=" + decryptSignature(tags.get("s"), decryptionCode);
+                            if (tags.get("sp") == null) {
+                                // fallback for urls not conaining the "sp" tag
+                                streamUrl = streamUrl + "&signature=" + decryptSignature(tags.get("s"), decryptionCode);
+                            }
+                            else {
+                                streamUrl = streamUrl + "&" + tags.get("sp") + "=" + decryptSignature(tags.get("s"), decryptionCode);
+                            }
                         }
                         urlAndItags.put(streamUrl, itagItem);
                     }