chat commands: add pets command

Co-authored-by: Illya Myshakov <imyshako@uwaterloo.ca>

http-api/src/main/java/net/runelite/http/api/chat/ChatClient.java

@@ -25,10 +25,13 @@
 package net.runelite.http.api.chat;
 
 import com.google.gson.JsonParseException;
+import com.google.gson.reflect.TypeToken;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.nio.charset.StandardCharsets;
+import java.util.Collection;
+import java.util.Set;
 import lombok.AllArgsConstructor;
 import net.runelite.http.api.RuneLiteAPI;
 import okhttp3.HttpUrl;
@@ -362,4 +365,54 @@ public class ChatClient
 			throw new IOException(ex);
 		}
 	}
+
+	public boolean submitPetList(String username, Collection<Integer> petList) throws IOException
+	{
+		HttpUrl url = RuneLiteAPI.getApiBase().newBuilder()
+			.addPathSegment("chat")
+			.addPathSegment("pets")
+			.addQueryParameter("name", username)
+			.build();
+
+		Request request = new Request.Builder()
+			.post(RequestBody.create(RuneLiteAPI.JSON, RuneLiteAPI.GSON.toJson(petList)))
+			.url(url)
+			.build();
+
+		try (Response response = client.newCall(request).execute())
+		{
+			return response.isSuccessful();
+		}
+	}
+
+	public Set<Integer> getPetList(String username) throws IOException
+	{
+		HttpUrl url = RuneLiteAPI.getApiBase().newBuilder()
+			.addPathSegment("chat")
+			.addPathSegment("pets")
+			.addQueryParameter("name", username)
+			.build();
+
+		Request request = new Request.Builder()
+			.url(url)
+			.build();
+
+		try (Response response = client.newCall(request).execute())
+		{
+			if (!response.isSuccessful())
+			{
+				throw new IOException("Unable to look up pet list!");
+			}
+
+			InputStream in = response.body().byteStream();
+			// CHECKSTYLE:OFF
+			return RuneLiteAPI.GSON.fromJson(new InputStreamReader(in, StandardCharsets.UTF_8),
+				new TypeToken<Set<Integer>>(){}.getType());
+			// CHECKSTYLE:ON
+		}
+		catch (JsonParseException ex)
+		{
+			throw new IOException(ex);
+		}
+	}
 }