[YouTube] Workaround 403s on streaming URLs of WEB client after some time

These changes work around an anti-bot token, for which its requirement is A/B
tested on the WEB client. In this test, streaming URLs of this client return
HTTP errors 403 if the token is not provided after some time.

It also allows to not fetch the JavaScript player for non-age restricted
videos, reducing data usage.

The TVHTML5 embed client is now only fetched in the case of age-restricted
videos.

The methods forceFetchAndroidClient and forceFetchIosClient of
YoutubeStreamExtractor have been removed, as they are now not needed anymore.

These changes also break the extraction of appropriate error states for private
and deleted videos and invalid video IDs.

Author: AudricV

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubeParsingHelper.java

@@ -1301,31 +1301,49 @@ public static JsonBuilder<JsonObject> prepareTvHtml5EmbedJsonBuilder(
     }
 
     @Nonnull
-    public static byte[] createDesktopPlayerBody(
+    public static JsonObject getWebPlayerResponse(
+            @Nonnull final Localization localization,
+            @Nonnull final ContentCountry contentCountry,
+            @Nonnull final String videoId) throws IOException, ExtractionException {
+        final byte[] body = JsonWriter.string(
+                        prepareDesktopJsonBuilder(localization, contentCountry)
+                                .value(VIDEO_ID, videoId)
+                                .value(CONTENT_CHECK_OK, true)
+                                .value(RACY_CHECK_OK, true)
+                                .done())
+                .getBytes(StandardCharsets.UTF_8);
+        final String url = YOUTUBEI_V1_URL + "player" + "?" + DISABLE_PRETTY_PRINT_PARAMETER
+                + "&$fields=microformat,playabilityStatus,storyboards,videoDetails";
+
+        return JsonUtils.toJsonObject(getValidJsonResponseBody(
+                getDownloader().postWithContentTypeJson(
+                        url, getYouTubeHeaders(), body, localization)));
+    }
+
+    @Nonnull
+    public static byte[] createTvHtml5EmbedPlayerBody(
             @Nonnull final Localization localization,
             @Nonnull final ContentCountry contentCountry,
             @Nonnull final String videoId,
             @Nonnull final Integer sts,
-            final boolean isTvHtml5DesktopJsonBuilder,
-            @Nonnull final String contentPlaybackNonce) throws IOException, ExtractionException {
+            @Nonnull final String contentPlaybackNonce) {
         // @formatter:off
-        return JsonWriter.string((isTvHtml5DesktopJsonBuilder
-                        ? prepareTvHtml5EmbedJsonBuilder(localization, contentCountry, videoId)
-                        : prepareDesktopJsonBuilder(localization, contentCountry))
-                .object("playbackContext")
-                    .object("contentPlaybackContext")
-                        // Signature timestamp from the JavaScript base player is needed to get
-                        // working obfuscated URLs
-                        .value("signatureTimestamp", sts)
-                        .value("referer", "https://www.youtube.com/watch?v=" + videoId)
+        return JsonWriter.string(
+                prepareTvHtml5EmbedJsonBuilder(localization, contentCountry, videoId)
+                    .object("playbackContext")
+                        .object("contentPlaybackContext")
+                            // Signature timestamp from the JavaScript base player is needed to get
+                            // working obfuscated URLs
+                            .value("signatureTimestamp", sts)
+                            .value("referer", "https://www.youtube.com/watch?v=" + videoId)
+                        .end()
                     .end()
-                .end()
-                .value(CPN, contentPlaybackNonce)
-                .value(VIDEO_ID, videoId)
-                .value(CONTENT_CHECK_OK, true)
-                .value(RACY_CHECK_OK, true)
-                .done())
-                .getBytes(StandardCharsets.UTF_8);
+                    .value(CPN, contentPlaybackNonce)
+                    .value(VIDEO_ID, videoId)
+                    .value(CONTENT_CHECK_OK, true)
+                    .value(RACY_CHECK_OK, true)
+                    .done())
+                    .getBytes(StandardCharsets.UTF_8);
         // @formatter:on
     }