added botonguild api endpoint

src/EllieBot.GrpcApiBase/protos/other.proto

@@ -8,7 +8,7 @@ import "google/protobuf/timestamp.proto";
 package other;
 
 service GrpcOther {
-
+  rpc BotOnGuild(BotOnGuildRequest) returns (BotOnGuildReply);
   rpc GetGuilds(google.protobuf.Empty) returns (GetGuildsReply);
   rpc GetTextChannels(GetTextChannelsRequest) returns (GetTextChannelsReply);
 
@@ -20,6 +20,14 @@ service GrpcOther {
   rpc GetServerInfo(ServerInfoRequest) returns (GetServerInfoReply);
 }
 
+message BotOnGuildRequest {
+  uint64 guildId = 1;
+}
+
+message BotOnGuildReply {
+  bool success = 1;
+}
+
 message GetGuildsReply {
   repeated GuildReply guilds = 1;
 }

src/EllieBot/Services/GrpcApi/OtherSvc.cs

@@ -39,6 +39,19 @@ public sealed class OtherSvc : GrpcOther.GrpcOtherBase, IEService
         _cache = cache;
     }
 
+    [GrpcNoAuthRequired]
+    public override async Task<BotOnGuildReply> BotOnGuild(BotOnGuildRequest request, ServerCallContext context)
+    {
+        var guild = await _client.GetGuildAsync(request.GuildId);
+
+        var reply = new BotOnGuildReply
+        {
+            Success = guild is not null
+        };
+
+        return reply;
+    }
+
     public override async Task<GetTextChannelsReply> GetTextChannels(
         GetTextChannelsRequest request,
         ServerCallContext context)