2 files changed, 144 insertions, 0 deletions

diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
index d574e4b79..05fdfea82 100644
--- a/src/common/CMakeLists.txt
+++ b/src/common/CMakeLists.txt
@@ -41,6 +41,7 @@ add_custom_command(OUTPUT scm_rev.cpp
 add_library(common STATIC
     algorithm.h
     alignment.h
+    announce_multiplayer_room.h
     assert.cpp
     assert.h
     atomic_helpers.h
diff --git a/src/common/announce_multiplayer_room.h b/src/common/announce_multiplayer_room.h
new file mode 100644
index 000000000..0ad9da2be
--- /dev/null
+++ b/src/common/announce_multiplayer_room.h
@@ -0,0 +1,143 @@
+// SPDX-FileCopyrightText: Copyright 2017 Citra Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <array>
+#include <functional>
+#include <string>
+#include <vector>
+#include "common/common_types.h"
+#include "web_service/web_result.h"
+
+namespace AnnounceMultiplayerRoom {
+
+using MacAddress = std::array<u8, 6>;
+
+struct GameInfo {
+    std::string name{""};
+    u64 id{0};
+};
+
+struct Member {
+    std::string username;
+    std::string nickname;
+    std::string display_name;
+    std::string avatar_url;
+    MacAddress mac_address;
+    GameInfo game;
+};
+
+struct RoomInformation {
+    std::string name;          ///< Name of the server
+    std::string description;   ///< Server description
+    u32 member_slots;          ///< Maximum number of members in this room
+    u16 port;                  ///< The port of this room
+    GameInfo preferred_game;   ///< Game to advertise that you want to play
+    std::string host_username; ///< Forum username of the host
+    bool enable_yuzu_mods;     ///< Allow yuzu Moderators to moderate on this room
+};
+
+struct Room {
+    RoomInformation information;
+
+    std::string id;
+    std::string verify_uid; ///< UID used for verification
+    std::string ip;
+    u32 net_version;
+    bool has_password;
+
+    std::vector<Member> members;
+};
+using RoomList = std::vector<Room>;
+
+/**
+ * A AnnounceMultiplayerRoom interface class. A backend to submit/get to/from a web service should
+ * implement this interface.
+ */
+class Backend {
+public:
+    virtual ~Backend() = default;
+
+    /**
+     * Sets the Information that gets used for the announce
+     * @param uid The Id of the room
+     * @param name The name of the room
+     * @param description The room description
+     * @param port The port of the room
+     * @param net_version The version of the libNetwork that gets used
+     * @param has_password True if the room is passowrd protected
+     * @param preferred_game The preferred game of the room
+     * @param preferred_game_id The title id of the preferred game
+     */
+    virtual void SetRoomInformation(const std::string& name, const std::string& description,
+                                    const u16 port, const u32 max_player, const u32 net_version,
+                                    const bool has_password, const GameInfo& preferred_game) = 0;
+    /**
+     * Adds a player information to the data that gets announced
+     * @param nickname The nickname of the player
+     * @param mac_address The MAC Address of the player
+     * @param game_id The title id of the game the player plays
+     * @param game_name The name of the game the player plays
+     */
+    virtual void AddPlayer(const Member& member) = 0;
+
+    /**
+     * Updates the data in the announce service. Re-register the room when required.
+     * @result The result of the update attempt
+     */
+    virtual WebService::WebResult Update() = 0;
+
+    /**
+     * Registers the data in the announce service
+     * @result The result of the register attempt. When the result code is Success, A global Guid of
+     * the room which may be used for verification will be in the result's returned_data.
+     */
+    virtual WebService::WebResult Register() = 0;
+
+    /**
+     * Empties the stored players
+     */
+    virtual void ClearPlayers() = 0;
+
+    /**
+     * Get the room information from the announce service
+     * @result A list of all rooms the announce service has
+     */
+    virtual RoomList GetRoomList() = 0;
+
+    /**
+     * Sends a delete message to the announce service
+     */
+    virtual void Delete() = 0;
+};
+
+/**
+ * Empty implementation of AnnounceMultiplayerRoom interface that drops all data. Used when a
+ * functional backend implementation is not available.
+ */
+class NullBackend : public Backend {
+public:
+    ~NullBackend() = default;
+    void SetRoomInformation(const std::string& /*name*/, const std::string& /*description*/,
+                            const u16 /*port*/, const u32 /*max_player*/, const u32 /*net_version*/,
+                            const bool /*has_password*/,
+                            const GameInfo& /*preferred_game*/) override {}
+    void AddPlayer(const Member& /*member*/) override {}
+    WebService::WebResult Update() override {
+        return WebService::WebResult{WebService::WebResult::Code::NoWebservice,
+                                     "WebService is missing", ""};
+    }
+    WebService::WebResult Register() override {
+        return WebService::WebResult{WebService::WebResult::Code::NoWebservice,
+                                     "WebService is missing", ""};
+    }
+    void ClearPlayers() override {}
+    RoomList GetRoomList() override {
+        return RoomList{};
+    }
+
+    void Delete() override {}
+};
+
+} // namespace AnnounceMultiplayerRoom