🚧 CAS integration

modules/CombotAntiSpam/Combot/CombotApiResponse.cs

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+using System;
+using Newtonsoft.Json;
+
+namespace Kruzya.TelegramBot.CombotAntiSpam.Combot
+{
+    internal class CombotApiResponse
+    {
+        public class ApiResult
+        {
+            [JsonProperty("messages")]
+            public string[] Messages { get; set; }
+            
+            [JsonProperty("time_added")]
+            public int TimeAdded { get; set; }
+            
+            [JsonProperty("offenses")]
+            public int Offenses { get; set; }
+
+            public DateTime AddedAt => DateTimeOffset.FromUnixTimeSeconds(TimeAdded).DateTime;
+        }
+
+        [JsonProperty("ok")]
+        public bool IsSpammer { get; set; }
+        
+        [JsonProperty("description")]
+        public string Description { get; set; }
+        
+        [JsonProperty("result")]
+        public ApiResult Result { get; set; }
+    }
+}

modules/CombotAntiSpam/Combot/CombotClient.cs

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+using System;
+using System.Net.Http;
+using System.Threading.Tasks;
+using Kruzya.TelegramBot.Core.Extensions;
+using Telegram.Bot.Types;
+
+namespace Kruzya.TelegramBot.CombotAntiSpam.Combot
+{
+    public class CombotClient : ICombotClient
+    {
+        public HttpClient _HttpClient;
+
+        public CombotClient()
+        {
+            _HttpClient = new HttpClient();
+            _HttpClient.BaseAddress = new Uri("https://api.cas.chat/check");
+        }
+        
+        public bool IsSpammer(User user)
+        {
+            return IsSpammerAsync(user).GetAwaiter().GetResult();
+        }
+
+        public async Task<bool> IsSpammerAsync(User user)
+        {
+            var result = await _HttpClient.GetJsonAsync<CombotApiResponse>($"?user_id={user.Id}");
+            return result.IsSpammer;
+        }
+    }
+}

modules/CombotAntiSpam/Combot/ICombotClient.cs

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+using System.Threading.Tasks;
+using Telegram.Bot.Types;
+
+namespace Kruzya.TelegramBot.CombotAntiSpam.Combot
+{
+    public interface ICombotClient
+    {
+        public bool IsSpammer(User user);
+        public Task<bool> IsSpammerAsync(User user);
+    }
+}