Committing in-progress implementation of ban petitions

Module/ModTools/Commands/BanKick.cs

@@ -8,7 +8,6 @@ using System.Threading.Tasks;
 
 namespace Noikoio.RegexBot.Module.ModTools.Commands
 {
-    
     class BanKick : CommandBase
     {
         // Ban and kick commands are highly similar in implementation, and thus are handled in a single class.
@@ -20,6 +19,11 @@ namespace Noikoio.RegexBot.Module.ModTools.Commands
         private readonly string _successMsg;
         private readonly string _notifyMsg;
 
+        const string DefaultMsg = "You have been {0} from $s for the following reason:\n$r";
+        const string DefaultMsgBanAppend = "\n\nIf the moderators have allowed it, you may petition your ban by" +
+            " submitting **one** message to the moderation team. To do so, reply to this message with" +
+            " `!petition [Your message here]`.";
+
         // Configuration:
         // "forcereason" - boolean; Force a reason to be given. Defaults to false.
         // "purgedays" - integer; Number of days of target's post history to delete, if banning.
@@ -41,8 +45,8 @@ namespace Noikoio.RegexBot.Module.ModTools.Commands
             if (conf["notifymsg"] == null)
             {
                 // Message not specified - use default
-                string act = _mode == CommandMode.Ban ? "banned" : "kicked";
+                _notifyMsg = string.Format(DefaultMsg, mode == CommandMode.Ban ? "banned" : "kicked");
-                _notifyMsg = $"You have been {act} from $s for the following reason:\n$r";
+                if (_mode == CommandMode.Ban) _notifyMsg += DefaultMsgBanAppend;
             }
             else
             {

Module/ModTools/ModTools.cs

@@ -25,13 +25,26 @@ namespace Noikoio.RegexBot.Module.ModTools
 
         private async Task Client_MessageReceived(SocketMessage arg)
         {
-            await CommandCheckInvoke(arg);
+            if (arg.Channel is IDMChannel) await PetitionRelayCheck(arg);
+            else if (arg.Channel is IGuildChannel) await CommandCheckInvoke(arg);
         }
 
+        #region Config
         [ConfigSection("modtools")]
         public override async Task<object> ProcessConfiguration(JToken configSection)
         {
-            // TODO: put command definitions elsewhere, not in root of this config
+            if (configSection.Type != JTokenType.Object)
+            {
+                throw new RuleImportException("Configuration for this section is invalid.");
+            }
+            
+            // BIG TO DO LIST:
+            /*
+             * 1. Have commands go into their own space within modtools. Candidate name: "banappeal"
+             * 2. Add a property for where to put the petition channel
+             * 3. Within ban cmd load, have it check for the existence of a petition channel... if possible?
+             *      I guess otherwise silently discard, if the info isn't readily available. I don't know.
+             */
 
             var commands = new Dictionary<string, CommandBase>(StringComparer.OrdinalIgnoreCase);
 
@@ -50,13 +63,24 @@ namespace Noikoio.RegexBot.Module.ModTools
             return new ReadOnlyDictionary<string, CommandBase>(commands);
         }
 
+        /*
+         * Config is stored in a tuple. I admit, not the best choice...
+         * Consider a different approach if more data needs to be stored in the future.
+         * Item 1: Command config (Dictionary<string, CommandBase>)
+         * Item 2: Ban petition channel (EntityName)
+         */
+
+        private new Tuple<Dictionary<string, CommandBase>, EntityName> GetConfig(ulong guildId)
+            => (Tuple<Dictionary<string, CommandBase>, EntityName>)base.GetConfig(guildId);
+        private Dictionary<string, CommandBase> GetCommandConfig(ulong guild) => GetConfig(guild).Item1;
+        private EntityName GetPetitionConfig(ulong guild) => GetConfig(guild).Item2;
+        #endregion
+
         public new Task Log(string text) => base.Log(text);
 
         private async Task CommandCheckInvoke(SocketMessage arg)
         {
-            // Disregard if not in a guild
+            SocketGuild g = ((SocketGuildUser)arg.Author).Guild;
-            SocketGuild g = (arg.Author as SocketGuildUser)?.Guild;
-            if (g == null) return;
 
             // Get guild config
             ServerConfig sc = RegexBot.Config.Servers.FirstOrDefault(s => s.Id == g.Id);
@@ -73,7 +97,7 @@ namespace Noikoio.RegexBot.Module.ModTools
             int spc = arg.Content.IndexOf(' ');
             if (spc != -1) cmdchk = arg.Content.Substring(0, spc);
             else cmdchk = arg.Content;
-            if (((IDictionary<string, CommandBase>)GetConfig(g.Id)).TryGetValue(cmdchk, out var c))
+            if ((GetCommandConfig(g.Id)).TryGetValue(cmdchk, out var c))
             {
                 try
                 {
@@ -87,5 +111,107 @@ namespace Noikoio.RegexBot.Module.ModTools
                 }
             }
         }
+
+        /// <summary>
+        /// List of available appeals. Key is user (for quick lookup). Value is guild (for quick config resolution).
+        /// TODO expiration?
+        /// </summary>
+        private Dictionary<ulong, ulong> _openPetitions; // Key: user, Value: guild
+        public void AddPetition(ulong guild, ulong user)
+        {
+            lock (_openPetitions) _openPetitions[user] = guild;
+        }
+        private async Task PetitionRelayCheck(SocketMessage msg)
+        {
+            const string PetitionAccepted = "Your petition has been forwarded to the moderators for review.";
+            const string PetitionDenied = "You may not submit a ban petition.";
+            if (!msg.Content.StartsWith("!petition ", StringComparison.InvariantCultureIgnoreCase)) return;
+
+            // Input validation
+            string ptext = msg.Content.Substring(10);
+            if (string.IsNullOrWhiteSpace(ptext))
+            {
+                // Just ignore.
+                return;
+            }
+
+            ulong targetGuild = 0;
+            lock (_openPetitions)
+            {
+                if (_openPetitions.TryGetValue(msg.Author.Id, out targetGuild))
+                {
+                    _openPetitions.Remove(msg.Author.Id);
+                }
+            }
+
+            // It's possible the sender may still block messages sent to them,
+            // hence the empty catch blocks you'll see up ahead.
+
+            if (targetGuild == 0)
+            {
+                try { await msg.Author.SendMessageAsync(PetitionDenied); }
+                catch (Discord.Net.HttpException) { }
+                return;
+            }
+            var gObj = Client.GetGuild(targetGuild);
+            if (gObj == null)
+            {
+                // Guild is missing. No longer in guild?
+                try { await msg.Author.SendMessageAsync(PetitionDenied); }
+                catch (Discord.Net.HttpException) { }
+                return;
+            }
+
+            // Get petition reporting target if not already known
+            var rch = GetPetitionConfig(targetGuild);
+            ISocketMessageChannel rchObj;
+            if (!rch.Id.HasValue)
+            {
+                rchObj = gObj.TextChannels
+                    .Where(c => c.Name.Equals(rch.Name, StringComparison.InvariantCultureIgnoreCase))
+                    .FirstOrDefault();
+            }
+            else
+            {
+                rchObj = (ISocketMessageChannel)gObj.GetChannel(rch.Id.Value);
+            }
+            if (rchObj == null)
+            {
+                // Channel not found.
+                await Log("Petition reporting channel could not be resolved.");
+                try { await msg.Author.SendMessageAsync(PetitionDenied); }
+                catch (Discord.Net.HttpException) { }
+                return;
+            }
+
+            // Ready to relay as embed
+            try
+            {
+                await rchObj.SendMessageAsync("", embed: new EmbedBuilder()
+                {
+                    Color = new Color(0x00FFD9),
+
+                    Author = new EmbedAuthorBuilder()
+                    {
+                        Name = $"{msg.Author.ToString()} - Ban petition:",
+                        IconUrl = msg.Author.GetAvatarUrl()
+                    },
+                    Description = ptext,
+                    Timestamp = msg.Timestamp
+                });
+            }
+            catch (Discord.Net.HttpException ex)
+            {
+                await Log("Failed to relay petition message by " + msg.Author.ToString());
+                await Log(ex.Message);
+                // For the user's point of view, fail silently.
+                try { await msg.Author.SendMessageAsync(PetitionDenied); }
+                catch (Discord.Net.HttpException) { }
+            }
+
+            // Success. Notify user.
+            try { await msg.Author.SendMessageAsync(PetitionAccepted); }
+            catch (Discord.Net.HttpException) { }
+        }
     }
 }