[code-watcher] init module.

Core/Extensions/BotExtension.cs

@@ -31,5 +31,16 @@ namespace Kruzya.TelegramBot.Core.Extensions
 
             return canUse;
         }
+
+        public static async Task<bool> CanDeleteMessagesAsync(this ITelegramBotClient bot, Chat chat)
+        {
+            return await CanDeleteMessagesAsync(bot, chat, await bot.GetMeAsync());
+        }
+
+        public static async Task<bool> CanDeleteMessagesAsync(this ITelegramBotClient bot, Chat chat, User user)
+        {
+            return await bot.GetChatMemberAsync(chat.Id, user.Id) is ChatMemberOwner 
+                or ChatMemberAdministrator {CanRestrictMembers: true};
+        }
     }
 }

Dockerfile

@@ -17,6 +17,7 @@ COPY ./modules/ChatQuotes/*.csproj ./modules/ChatQuotes/
 COPY ./modules/Reputation/*.csproj ./modules/Reputation/ 
 COPY ./modules/ContentStore/*.csproj ./modules/ContentStore/
 COPY ./modules/DebugTools/*.csproj ./modules/DebugTools/ 
+COPY ./modules/CodeWatcher/*.csproj ./modules/CodeWatcher/ 
 RUN dotnet restore Kruzya.TelegramBot.sln
 
 # Copy all project files

Kruzya.TelegramBot.sln

@@ -29,7 +29,9 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Reputation", "modules\Reput
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ContentStore", "modules\ContentStore\ContentStore.csproj", "{4F1E8FE8-640F-4671-87FC-0FFCCB6EDF5E}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DebugTools", "modules\DebugTools\DebugTools.csproj", "{B95C9180-4893-4A33-BF43-AB2EE998650C}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DebugTools", "modules\DebugTools\DebugTools.csproj", "{B95C9180-4893-4A33-BF43-AB2EE998650C}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CodeWatcher", "modules\CodeWatcher\CodeWatcher.csproj", "{DEF70068-93E5-4198-8CED-4B3D8AE65162}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -89,6 +91,10 @@ Global
 		{B95C9180-4893-4A33-BF43-AB2EE998650C}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{B95C9180-4893-4A33-BF43-AB2EE998650C}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{B95C9180-4893-4A33-BF43-AB2EE998650C}.Release|Any CPU.Build.0 = Release|Any CPU
+		{DEF70068-93E5-4198-8CED-4B3D8AE65162}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{DEF70068-93E5-4198-8CED-4B3D8AE65162}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{DEF70068-93E5-4198-8CED-4B3D8AE65162}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{DEF70068-93E5-4198-8CED-4B3D8AE65162}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -105,6 +111,7 @@ Global
 		{03F3C7D5-6FEF-4A83-9191-501091BFC1AC} = {C7821F15-DEDD-474F-A575-A296D4B58F10}
 		{4F1E8FE8-640F-4671-87FC-0FFCCB6EDF5E} = {C7821F15-DEDD-474F-A575-A296D4B58F10}
 		{B95C9180-4893-4A33-BF43-AB2EE998650C} = {C7821F15-DEDD-474F-A575-A296D4B58F10}
+		{DEF70068-93E5-4198-8CED-4B3D8AE65162} = {C7821F15-DEDD-474F-A575-A296D4B58F10}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {5BA73C3B-D5FC-4942-9091-504325CDC308}

modules/CodeWatcher/CodeWatcher.cs

@@ -0,0 +1,9 @@
+using Kruzya.TelegramBot.Core;
+
+namespace West.TelegramBot.CodeWatcher
+{
+    public class CodeWatcher : Module
+    {
+        public CodeWatcher(Core core) : base(core) {}
+    }
+}

modules/CodeWatcher/CodeWatcher.csproj

@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <AssemblyName>TelegramBot.CodeWatcher</AssemblyName>
+    <RootNamespace>West.TelegramBot.CodeWatcher</RootNamespace>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\Core\Core.csproj" />
+  </ItemGroup>
+
+</Project>

modules/CodeWatcher/Handler.cs

@@ -0,0 +1,67 @@
+using BotFramework;
+using BotFramework.Attributes;
+using BotFramework.Enums;
+using BotFramework.Utils;
+using Kruzya.TelegramBot.Core.Extensions;
+using Telegram.Bot;
+using Telegram.Bot.Types;
+using Telegram.Bot.Types.Enums;
+
+namespace West.TelegramBot.CodeWatcher;
+
+public class Handler : BotEventHandler
+{
+    private static readonly string ResponseMessage = new HtmlString()
+        .Text(", не стоит публиковать столь большой код прямо в чат. Вместо этого загрузите его на ")
+        .Url("https://pastebin.com", "https://pastebin.com")
+        .Text(" и отправьте в виде ссылки.")
+        .ToString();
+
+
+    [Message(InChat.Public, MessageFlag.HasText)]
+    public async Task HandleMessage()
+    {
+        var message = RawUpdate.Message!;
+
+        if (message.Entities == null)
+        {
+            return;
+        }
+
+        if (!await Bot.CanDeleteMessagesAsync(Chat))
+        {
+            return;
+        }
+
+        foreach (var entity in message.Entities)
+        {
+            if (entity.Type is MessageEntityType.Code or MessageEntityType.Pre)
+            {
+                var entityLines = message.Text!
+                    .Substring(entity.Offset, entity.Length)
+                    .SplitToLines()
+                    .ToList();
+
+                if (entityLines.Count >= 10)
+                {
+                    await DeleteAndNotifyAsync(message);
+                    return;
+                }
+
+                if (entityLines.Any(line => line.Length > 80))
+                {
+                    await DeleteAndNotifyAsync(message);
+                    return;
+                }
+            }
+        }
+    }
+
+    public async Task DeleteAndNotifyAsync(Message message)
+    {
+        await Bot.DeleteMessageAsync(Chat.Id, message.MessageId);
+        await Bot.SendTextMessageAsync(Chat.Id,
+            (message.From?.ToHtml() ?? "") + ResponseMessage, 
+            ParseMode.Html);
+    }
+}

modules/CodeWatcher/StringExtension.cs

@@ -0,0 +1,17 @@
+namespace West.TelegramBot.CodeWatcher;
+
+public static class StringExtension
+{
+    // https://stackoverflow.com/a/23408020
+    public static IEnumerable<string> SplitToLines(this string input)
+    {
+        using (var reader = new StringReader(input))
+        {
+            string line;
+            while ((line = reader.ReadLine()) != null)
+            {
+                yield return line;
+            }
+        }
+    }
+}