[Protocol] Add room chat channel extensions and catalog payload (#7475)

* [Protocol] Add room chat channel extensions and catalog payload

* [Protocol] Add per-channel write level and banner to room channel catalog

Adds two optional fields to ServerInfo_RoomChannel:

- write_access_level: minimum privilege level required to send to the
  channel. When unset, writing requires the same level as reading
  (access_level), preserving the previous single-level behavior. This
  allows read-mostly channels such as a developer news feed: readable
  by everyone, writable only by developers.
- banner_message: static notice shown at the top of the channel,
  analogous to the room join message on Main. Empty means none.

---------

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

libcockatrice_protocol/libcockatrice/protocol/pb/CMakeLists.txt

@@ -117,6 +117,7 @@ set(PROTO_FILES
     event_reveal_cards.proto
     event_reverse_turn.proto
     event_roll_die.proto
+    event_room_channel_say.proto
     event_room_say.proto
     event_server_complete_list.proto
     event_server_identification.proto
@@ -201,6 +202,7 @@ set(PROTO_FILES
     serverinfo_replay_match.proto
     serverinfo_report.proto
     serverinfo_room.proto
+    serverinfo_room_channel.proto
     serverinfo_user.proto
     serverinfo_user_alt.proto
     serverinfo_user_session.proto

libcockatrice_protocol/libcockatrice/protocol/pb/event_room_channel_say.proto

@@ -0,0 +1,12 @@
+syntax = "proto2";
+import "room_event.proto";
+
+message Event_RoomChannelSay {
+    extend RoomEvent {
+        optional Event_RoomChannelSay ext = 1005; // next free RoomEvent extension
+    }
+    optional string channel_id = 1;
+    optional string name = 2;
+    optional string message = 3;
+    optional uint64 time_of = 4;
+}

libcockatrice_protocol/libcockatrice/protocol/pb/room_event.proto

@@ -6,6 +6,7 @@ message RoomEvent {
         ROOM_SAY = 1002;
         LIST_GAMES = 1003;
         REMOVE_MESSAGES = 1004;
+        ROOM_CHANNEL_SAY = 1005;
     }
     optional sint32 room_id = 1;
     extensions 100 to max;

libcockatrice_protocol/libcockatrice/protocol/pb/serverinfo_chat_message.proto

@@ -13,4 +13,5 @@ message ServerInfo_ChatMessage {
     optional string target_type = 6; // target type (room,game,chat)
     optional string target_id = 7;   // id of target
     optional string target_name = 8; // name of target
+    optional string channel = 9;     // channel id, for room_channel targets
 }

libcockatrice_protocol/libcockatrice/protocol/pb/serverinfo_room.proto

@@ -2,6 +2,7 @@ syntax = "proto2";
 import "serverinfo_game.proto";
 import "serverinfo_user.proto";
 import "serverinfo_gametype.proto";
+import "serverinfo_room_channel.proto";
 
 message ServerInfo_Room {
     optional sint32 room_id = 1;
@@ -15,4 +16,5 @@ message ServerInfo_Room {
     repeated ServerInfo_GameType gametype_list = 9;
     optional string permissionlevel = 10;
     optional string privilegelevel = 11;
+    repeated ServerInfo_RoomChannel channel_list = 12;
 }

libcockatrice_protocol/libcockatrice/protocol/pb/serverinfo_room_channel.proto

@@ -0,0 +1,23 @@
+syntax = "proto2";
+
+message ServerInfo_RoomChannel {
+    enum AccessLevel {
+        // Minimum privilege level, evaluated against the privilege ladder
+        // Public < Registered < Judge < Moderator < Admin < Developer.
+        Public = 0;
+        Registered = 1;
+        Judge = 2;
+        Moderator = 3;
+        Admin = 4;
+        Developer = 5;
+    }
+    optional string id = 1;                                   // stable ASCII id, e.g. "deck-discussion"
+    optional string display_name = 2;                         // server-provided, localizable only server-side
+    optional AccessLevel access_level = 3 [default = Public]; // minimum privilege level required to read the channel
+    // Minimum privilege level required to write to the channel. When unset, writing requires the same level as
+    // reading. This allows read-mostly channels such as a developer news feed: readable by everyone, writable
+    // only by developers.
+    optional AccessLevel write_access_level = 4;
+    // Static banner shown at the top of the channel, analogous to the room join message on Main. Empty = none.
+    optional string banner_message = 5;
+}