Added .imageonlychannel / .imageonly to prevent users from posting anything but images in the channel

CHANGELOG.md

@@ -8,6 +8,8 @@ Experimental changelog. Mostly based on [keepachangelog](https://keepachangelog.
 
 - Added `.massban` to ban multiple people at once. 30 second cooldown
 - Added `.youtubeuploadnotif` / `.yun` as a shortcut for subscribing to a youtube channel's rss feed
+- Added `.imageonlychannel` / `.imageonly` to prevent users from posting anything but images in the channel 
+- Fully translated to Spanish 🎉
 
 ### Changed
 

src/NadekoBot.Tests/BotStringsTests.cs

@@ -2,12 +2,10 @@
 using System.Globalization;
 using System.Linq;
 using System.Reflection;
-using AngleSharp.Common;
 using Discord.Commands;
 using NadekoBot.Common.Attributes;
 using NadekoBot.Services;
 using NadekoBot.Modules;
-using YamlDotNet.Serialization;
 
 namespace NadekoBot.Tests
 {

src/NadekoBot/Db/Models/ImageOnlyChannel.cs

@@ -0,0 +1,8 @@
+namespace NadekoBot.Services.Database.Models
+{
+    public class ImageOnlyChannel : DbEntity
+    {
+        public ulong GuildId { get; set; }
+        public ulong ChannelId { get; set; }
+    }
+}

src/NadekoBot/Db/Models/LogSetting.cs

@@ -2,7 +2,6 @@
 
 namespace NadekoBot.Services.Database.Models
 {
-
     public class LogSetting : DbEntity
     {
         public HashSet<IgnoredLogChannel> IgnoredChannels { get; set; } = new HashSet<IgnoredLogChannel>();

src/NadekoBot/Db/NadekoContext.cs

@@ -2,11 +2,9 @@
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Design;
 using NadekoBot.Services.Database.Models;
-using NadekoBot.Services;
 using System;
 using System.IO;
 using Microsoft.Extensions.Logging;
-using NadekoBot.Common;
 using NadekoBot.Db.Models;
 
 namespace NadekoBot.Services.Database
@@ -60,6 +58,7 @@ namespace NadekoBot.Services.Database
         public DbSet<Repeater> Repeaters { get; set; }
         public DbSet<Poll> Poll { get; set; }
         public DbSet<WaifuInfo> WaifuInfo { get; set; }
+        public DbSet<ImageOnlyChannel> ImageOnlyChannels { get; set; }
 
         public NadekoContext(DbContextOptions<NadekoContext> options) : base(options)
         {
@@ -345,6 +344,10 @@ namespace NadekoBot.Services.Database
                 .IsUnique());
 
             #endregion
+
+            modelBuilder.Entity<ImageOnlyChannel>(ioc => ioc
+                .HasIndex(x => x.ChannelId)
+                .IsUnique());
         }
     }
 }

src/NadekoBot/Migrations/20210914180026_image-only-channels.cs

@@ -0,0 +1,38 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace NadekoBot.Migrations
+{
+    public partial class imageonlychannels : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "ImageOnlyChannels",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "INTEGER", nullable: false)
+                        .Annotation("Sqlite:Autoincrement", true),
+                    GuildId = table.Column<ulong>(type: "INTEGER", nullable: false),
+                    ChannelId = table.Column<ulong>(type: "INTEGER", nullable: false),
+                    DateAdded = table.Column<DateTime>(type: "TEXT", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_ImageOnlyChannels", x => x.Id);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ImageOnlyChannels_ChannelId",
+                table: "ImageOnlyChannels",
+                column: "ChannelId",
+                unique: true);
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "ImageOnlyChannels");
+        }
+    }
+}

src/NadekoBot/Migrations/NadekoContextModelSnapshot.cs

@@ -187,6 +187,29 @@ namespace NadekoBot.Migrations
                     b.ToTable("FollowedStream");
                 });
 
+            modelBuilder.Entity("NadekoBot.Services.Database.ImageOnlyChannel", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<ulong>("ChannelId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<DateTime?>("DateAdded")
+                        .HasColumnType("TEXT");
+
+                    b.Property<ulong>("GuildId")
+                        .HasColumnType("INTEGER");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("ChannelId")
+                        .IsUnique();
+
+                    b.ToTable("ImageOnlyChannels");
+                });
+
             modelBuilder.Entity("NadekoBot.Services.Database.Models.AntiAltSetting", b =>
                 {
                     b.Property<int>("Id")

src/NadekoBot/Modules/Administration/Administration.cs

@@ -13,13 +13,31 @@ namespace NadekoBot.Modules.Administration
 {
     public partial class Administration : NadekoModule<AdministrationService>
     {
+        private readonly ImageOnlyChannelService _imageOnly;
+
+        public Administration(ImageOnlyChannelService imageOnly)
+        {
+            _imageOnly = imageOnly;
+        }
+        
         public enum List
         {
             List = 0,
             Ls = 0
         }
 
-
+        [NadekoCommand, Aliases]
+        [RequireContext(ContextType.Guild)]
+        [UserPerm(GuildPerm.Administrator)]
+        [BotPerm(GuildPerm.Administrator)]
+        public async Task ImageOnlyChannel(StoopidTime time = null)
+        {
+            var newValue = _imageOnly.ToggleImageOnlyChannel(ctx.Guild.Id, ctx.Channel.Id);
+            if (newValue)
+                await ReplyConfirmLocalizedAsync(strs.imageonly_enable);
+            else
+                await ReplyPendingLocalizedAsync(strs.imageonly_disable);
+        }
 
         [NadekoCommand, Aliases]
         [RequireContext(ContextType.Guild)]

src/NadekoBot/Modules/Administration/Services/AdministrationService.cs

@@ -1,9 +1,7 @@
-using System;
+using Discord;
-using Discord;
 using Discord.Commands;
 using Discord.WebSocket;
 using Microsoft.EntityFrameworkCore;
-using NadekoBot.Common;
 using NadekoBot.Common.Collections;
 using NadekoBot.Common.Replacements;
 using NadekoBot.Services;
@@ -24,14 +22,11 @@ namespace NadekoBot.Modules.Administration.Services
 
         private readonly DbService _db;
         private readonly ILogCommandService _logService;
-        private readonly IEmbedBuilderService _eb;
 
-        public AdministrationService(Bot bot, CommandHandler cmdHandler, DbService db,
+        public AdministrationService(Bot bot, CommandHandler cmdHandler, DbService db, ILogCommandService logService)
-            ILogCommandService logService, IEmbedBuilderService eb)
         {
             _db = db;
             _logService = logService;
-            _eb = eb;
 
             DeleteMessagesOnCommand = new ConcurrentHashSet<ulong>(bot.AllGuildConfigs
                 .Where(g => g.DeleteMessageOnCommand)

src/NadekoBot/Modules/Administration/Services/ImageOnlyChannelService.cs

@@ -0,0 +1,187 @@
+using System;
+using System.Collections.Concurrent;
+using System.Linq;
+using System.Net;
+using System.Threading.Channels;
+using System.Threading.Tasks;
+using Discord;
+using Discord.Net;
+using Discord.WebSocket;
+using LinqToDB;
+using Microsoft.Extensions.Caching.Memory;
+using NadekoBot.Common.Collections;
+using NadekoBot.Common.ModuleBehaviors;
+using NadekoBot.Extensions;
+using NadekoBot.Services;
+using Serilog;
+
+namespace NadekoBot.Modules.Administration.Services
+{
+    public sealed class ImageOnlyChannelService : IEarlyBehavior
+    {
+        private readonly IMemoryCache _ticketCache;
+        private readonly DiscordSocketClient _client;
+        private readonly DbService _db;
+        private readonly ConcurrentDictionary<ulong, ConcurrentHashSet<ulong>> _enabledOn;
+
+        private Channel<IUserMessage> _deleteQueue = Channel.CreateBounded<IUserMessage>(new BoundedChannelOptions(100)
+        {
+            FullMode = BoundedChannelFullMode.DropOldest,
+            SingleReader = true,
+            SingleWriter = false,
+        });
+
+
+        public ImageOnlyChannelService(IMemoryCache ticketCache, DiscordSocketClient client, DbService db)
+        {
+            _ticketCache = ticketCache;
+            _client = client;
+            _db = db;
+
+            var uow = _db.GetDbContext();
+            _enabledOn = uow.ImageOnlyChannels
+                .ToList()
+                .GroupBy(x => x.GuildId)
+                .ToDictionary(x => x.Key, x => new ConcurrentHashSet<ulong>(x.Select(x => x.ChannelId)))
+                .ToConcurrent();
+            
+            _ = Task.Run(DeleteQueueRunner);
+            
+            _client.ChannelDestroyed += ClientOnChannelDestroyed;
+        }
+
+        private Task ClientOnChannelDestroyed(SocketChannel ch)
+        {
+            if (ch is not IGuildChannel gch)
+                return Task.CompletedTask;
+
+            if (_enabledOn.TryGetValue(gch.GuildId, out var channels) && channels.TryRemove(ch.Id))
+                ToggleImageOnlyChannel(gch.GuildId, ch.Id, true);
+
+            return Task.CompletedTask;
+        }
+
+        private async Task DeleteQueueRunner()
+        {
+            while (true)
+            {
+                var toDelete = await _deleteQueue.Reader.ReadAsync();
+                try
+                {
+                    await toDelete.DeleteAsync();
+                    await Task.Delay(1000);
+                }
+                catch (HttpException ex) when (ex.HttpCode == HttpStatusCode.Forbidden)
+                {
+                    // disable if bot can't delete messages in the channel
+                    ToggleImageOnlyChannel(((ITextChannel)toDelete.Channel).GuildId, toDelete.Channel.Id, true);
+                }
+            }
+        }
+
+        public bool ToggleImageOnlyChannel(ulong guildId, ulong channelId, bool forceDisable = false)
+        {
+            var newState = false;
+            using var uow = _db.GetDbContext();
+            if (forceDisable 
+                || (_enabledOn.TryGetValue(guildId, out var channels) 
+                    && channels.TryRemove(channelId)))
+            {
+                uow.ImageOnlyChannels.Delete(x => x.ChannelId == channelId);
+            }
+            else
+            {
+                uow.ImageOnlyChannels.Add(new()
+                {
+                    GuildId = guildId,
+                    ChannelId = channelId
+                });
+
+                channels = _enabledOn.GetOrAdd(guildId, new ConcurrentHashSet<ulong>());
+                channels.Add(channelId);
+                newState = true;
+            }
+            
+            uow.SaveChanges();
+            return newState;
+        }
+
+        public async Task<bool> RunBehavior(IGuild guild, IUserMessage msg)
+        {
+            if (msg.Channel is not ITextChannel tch)
+                return false;
+            
+            if (msg.Attachments.Any(x => x is { Height: > 0, Width: > 0 }))
+                return false;
+
+            if (!_enabledOn.TryGetValue(tch.GuildId, out var chs)
+                || !chs.Contains(msg.Channel.Id))
+                return false;
+
+            var user = await tch.Guild.GetUserAsync(msg.Author.Id)
+                       ?? await _client.Rest.GetGuildUserAsync(tch.GuildId, msg.Author.Id);
+            
+            if (user is null)
+                return false;
+            
+            // ignore owner and admin
+            if (user.Id == tch.Guild.OwnerId || user.GuildPermissions.Administrator)
+            {
+                Log.Information("Image-Only: Ignoring owner od admin ({ChannelId})", msg.Channel.Id);
+                return false;
+            }
+
+            // ignore users higher in hierarchy
+            var botUser = await tch.Guild.GetCurrentUserAsync();
+            if (user.GetRoles().Max(x => x.Position) >= botUser.GetRoles().Max(x => x.Position))
+                return false;
+
+            // can't modify channel perms if not admin apparently
+            if (!botUser.GuildPermissions.ManageGuild)
+            {
+                ToggleImageOnlyChannel( tch.GuildId, tch.Id, true);;
+                return false;
+            }
+
+            var shouldLock = AddUserTicket(tch.GuildId, msg.Author.Id);
+            if (shouldLock)
+            {
+                await tch.AddPermissionOverwriteAsync(msg.Author, new(sendMessages: PermValue.Deny));
+                Log.Warning("Image-Only: User {User} [{UserId}] has been banned from typing in the channel [{ChannelId}]",
+                    msg.Author,
+                    msg.Author.Id,
+                    msg.Channel.Id);
+            }
+            
+            try
+            {
+                await _deleteQueue.Writer.WriteAsync(msg);
+            }
+            catch (Exception ex)
+            {
+                Log.Error(ex, "Error deleting message {MessageId} in image-only channel {ChannelId}.",
+                    msg.Id,
+                    tch.Id);
+            }
+
+            return true;
+        }
+
+        private bool AddUserTicket(ulong guildId, ulong userId)
+        {
+            var old = _ticketCache.GetOrCreate($"{guildId}_{userId}", entry =>
+            {
+                entry.AbsoluteExpirationRelativeToNow = TimeSpan.FromDays(1);
+                return 0;
+            });
+
+            _ticketCache.Set($"{guildId}_{userId}", ++old);
+            
+            // if this is the third time that the user posts a
+            // non image in an image-only channel on this server 
+            return old > 2;
+        }
+
+        public int Priority { get; } = 0;
+    }
+}

src/NadekoBot/data/aliases.yml

@@ -1255,3 +1255,7 @@ crsimport:
 crsexport:
   - crsexport
   - exexport
+imageonlychannel:
+  - imageonlychannel
+  - imageonly
+  - imagesonly

src/NadekoBot/data/strings/commands/commands.en-US.yml

@@ -2114,3 +2114,9 @@ nhentai:
   args:
     - "273426"
     - "cute girl"
+imageonlychannel:
+  desc: |- 
+    Toggles whether the channel only allows images.
+    Users who send more than a few non-image messages will be banned from using the channel. 
+  args:
+    - ""

src/NadekoBot/data/strings/responses/responses.en-US.json

@@ -962,5 +962,7 @@
   "empty_page": "This page is empty.",
   "pages": "Pages",
   "favorites": "Favorites",
-  "tags": "Tags"
+  "tags": "Tags",
+  "imageonly_enable": "This channel is now image-only.",
+  "imageonly_disable": "This channel is no longer image-only."
 }