Implement batched fetching of dearrow content.

src/main/java/me/kavin/piped/server/ServerLauncher.java

@@ -33,6 +33,7 @@ import org.xml.sax.InputSource;
 
 import java.io.ByteArrayInputStream;
 import java.net.InetSocketAddress;
+import java.util.List;
 import java.util.Objects;
 import java.util.concurrent.Executor;
 import java.util.concurrent.TimeUnit;
@@ -149,6 +150,23 @@ public class ServerLauncher extends MultithreadedHttpServerLauncher {
                     } catch (Exception e) {
                         return getErrorResponse(e, request.getPath());
                     }
+                })).map(GET, "/dearrow", AsyncServlet.ofBlocking(executor, request -> {
+                    try {
+                        var videoIds = getArray(request.getQueryParameter("videoIds"));
+
+                        return getJsonResponse(
+                                SponsorBlockUtils.getDeArrowedInfo(List.of(videoIds))
+                                        .thenApplyAsync(json -> {
+                                            try {
+                                                return mapper.writeValueAsBytes(json);
+                                            } catch (JsonProcessingException e) {
+                                                throw new RuntimeException(e);
+                                            }
+                                        }).get(),
+                                "public, max-age=3600");
+                    } catch (Exception e) {
+                        return getErrorResponse(e, request.getPath());
+                    }
                 })).map(GET, "/streams/:videoId", AsyncServlet.ofBlocking(executor, request -> {
                     try {
                         return getJsonResponse(StreamHandlers.streamsResponse(request.getPathParameter("videoId")),

src/main/java/me/kavin/piped/utils/SponsorBlockUtils.java

@@ -1,5 +1,10 @@
 package me.kavin.piped.utils;
 
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.NullNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.fasterxml.jackson.databind.node.TextNode;
 import me.kavin.piped.consts.Constants;
 import me.kavin.piped.utils.resp.InvalidRequestResponse;
 import me.kavin.piped.utils.resp.SimpleErrorMessage;
@@ -7,6 +12,9 @@ import org.apache.commons.codec.digest.DigestUtils;
 import org.apache.commons.lang3.StringUtils;
 
 import java.io.IOException;
+import java.util.List;
+import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
 
 import static me.kavin.piped.consts.Constants.mapper;
 
@@ -46,4 +54,46 @@ public class SponsorBlockUtils {
         return null;
     }
 
+    public static CompletableFuture<ObjectNode> getDeArrowedInfo(List<String> videoIds) {
+        ObjectNode objectNode = mapper.createObjectNode();
+
+        var futures = videoIds.stream()
+                .map(id -> getDeArrowedInfo(id).thenAcceptAsync(jsonNode -> objectNode.set(id, jsonNode.orElse(NullNode.getInstance()))))
+                .toArray(CompletableFuture[]::new);
+
+        return CompletableFuture.allOf(futures)
+                .thenApplyAsync(v -> objectNode, Multithreading.getCachedExecutor());
+    }
+
+    private static CompletableFuture<Optional<JsonNode>> getDeArrowedInfo(String videoId) {
+
+        String hash = DigestUtils.sha256Hex(videoId);
+
+        CompletableFuture<Optional<JsonNode>> future = new CompletableFuture<>();
+
+        Multithreading.runAsync(() -> {
+            for (String url : Constants.SPONSORBLOCK_SERVERS)
+                try {
+                    Optional<JsonNode> optional = RequestUtils.sendGetJson(url + "/api/branding/" + URLUtils.silentEncode(hash.substring(0, 4)))
+                            .thenApplyAsync(json -> json.has(videoId) ? Optional.of(json.get(videoId)) : Optional.<JsonNode>empty())
+                            .get();
+
+                    optional.ifPresent(jsonNode -> {
+                        ArrayNode nodes = (ArrayNode) jsonNode.get("thumbnails");
+                        for (JsonNode node : nodes) {
+                            ((ObjectNode) node).set("thumbnail", new TextNode(URLUtils.rewriteURL("https://dearrow-thumb.ajay.app/api/v1/getThumbnail?videoID=" + videoId + "&time=" + node.get("timestamp").asText())));
+                        }
+                    });
+
+
+                    future.complete(optional);
+                    return;
+                } catch (Exception ignored) {
+                }
+            future.completeExceptionally(new Exception("All SponsorBlock servers are down"));
+        });
+
+        return future;
+
+    }
 }