Implement listStickerPacks command

src/main/java/org/asamk/signal/commands/Commands.java

@@ -23,6 +23,7 @@ public class Commands {
         addCommand(new ListDevicesCommand());
         addCommand(new ListGroupsCommand());
         addCommand(new ListIdentitiesCommand());
+        addCommand(new ListStickerPacksCommand());
         addCommand(new QuitGroupCommand());
         addCommand(new ReceiveCommand());
         addCommand(new RegisterCommand());

src/main/java/org/asamk/signal/commands/ListStickerPacksCommand.java

@@ -0,0 +1,67 @@
+package org.asamk.signal.commands;
+
+import net.sourceforge.argparse4j.inf.Namespace;
+import net.sourceforge.argparse4j.inf.Subparser;
+
+import org.asamk.signal.commands.exceptions.CommandException;
+import org.asamk.signal.manager.Manager;
+import org.asamk.signal.manager.api.StickerPack;
+import org.asamk.signal.output.JsonWriter;
+import org.asamk.signal.output.OutputWriter;
+import org.asamk.signal.output.PlainTextWriter;
+import org.asamk.signal.util.Hex;
+
+import java.util.List;
+
+public class ListStickerPacksCommand implements JsonRpcLocalCommand {
+
+    @Override
+    public String getName() {
+        return "listStickerPacks";
+    }
+
+    @Override
+    public void attachToSubparser(final Subparser subparser) {
+        subparser.help("Show a list of known sticker packs.");
+    }
+
+    @Override
+    public void handleCommand(
+            final Namespace ns, final Manager c, final OutputWriter outputWriter
+    ) throws CommandException {
+        final var stickerPacks = c.getStickerPacks();
+        if (outputWriter instanceof JsonWriter jsonWriter) {
+            final var jsonStickerPacks = stickerPacks.stream().map(JsonStickerPack::new).toList();
+            jsonWriter.write(jsonStickerPacks);
+        } else if (outputWriter instanceof PlainTextWriter plainTextWriter) {
+            for (final var sticker : stickerPacks) {
+                plainTextWriter.println("Pack {}: “{}” by “{}” has {} stickers",
+                        Hex.toStringCondensed(sticker.packId().serialize()),
+                        sticker.title(),
+                        sticker.author(),
+                        sticker.stickers().size());
+            }
+        }
+    }
+
+    private record JsonStickerPack(
+            String packId, boolean installed, String title, String author, JsonSticker cover, List<JsonSticker> stickers
+    ) {
+
+        JsonStickerPack(StickerPack stickerPack) {
+            this(Hex.toStringCondensed(stickerPack.packId().serialize()),
+                    stickerPack.installed(),
+                    stickerPack.title(),
+                    stickerPack.author(),
+                    stickerPack.cover().map(JsonSticker::new).orElse(null),
+                    stickerPack.stickers().stream().map(JsonSticker::new).toList());
+        }
+
+        private record JsonSticker(int id, String emoji, String contentType) {
+
+            JsonSticker(StickerPack.Sticker sticker) {
+                this(sticker.id(), sticker.emoji(), sticker.contentType());
+            }
+        }
+    }
+}

src/main/java/org/asamk/signal/dbus/DbusManagerImpl.java

@@ -18,6 +18,7 @@ import org.asamk.signal.manager.api.Pair;
 import org.asamk.signal.manager.api.RecipientIdentifier;
 import org.asamk.signal.manager.api.SendGroupMessageResults;
 import org.asamk.signal.manager.api.SendMessageResults;
+import org.asamk.signal.manager.api.StickerPack;
 import org.asamk.signal.manager.api.TypingAction;
 import org.asamk.signal.manager.api.UpdateGroup;
 import org.asamk.signal.manager.groups.GroupId;
@@ -443,6 +444,11 @@ public class DbusManagerImpl implements Manager {
         }
     }
 
+    @Override
+    public List<StickerPack> getStickerPacks() {
+        throw new UnsupportedOperationException();
+    }
+
     @Override
     public void requestAllSyncData() throws IOException {
         signal.sendSyncRequest();