BirthdayBot/ApplicationCommands/Preconditions/EnforceBlocking.cs

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using BirthdayBot.Data;
using Discord.Interactions;
namespace BirthdayBot.ApplicationCommands;
/// <summary>
/// Only users not on the blocklist or affected by moderator mode may use the command.<br/>
/// This is used in the <see cref="BotModuleBase"/> base class. Manually using it anywhere else is unnecessary.
/// </summary>
class EnforceBlockingAttribute : PreconditionAttribute {
public const string FailModerated = "Guild has moderator mode enabled.";
public const string FailBlocked = "User is in the guild's block list.";
public const string ReplyModerated = ":x: This bot is in moderated mode, preventing you from using any bot commands in this server.";
public const string ReplyBlocked = ":x: You have been blocked from using bot commands in this server.";
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public override Task<PreconditionResult> CheckRequirementsAsync(
IInteractionContext context, ICommandInfo commandInfo, IServiceProvider services) {
// Not in guild context, unaffected by blocking
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if (context.Guild is not SocketGuild guild) return Task.FromResult(PreconditionResult.FromSuccess());
// Manage Guild permission overrides any blocks
var user = (SocketGuildUser)context.User;
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if (user.GuildPermissions.ManageGuild) return Task.FromResult(PreconditionResult.FromSuccess());
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using var db = new BotDatabaseContext();
var settings = (from row in db.GuildConfigurations
where row.GuildId == (long)guild.Id
select new { ModRole = (ulong?)row.ModeratorRole, ModMode = row.Moderated }).FirstOrDefault();
if (settings != null) {
// Bot moderators override all blocking measures in place
if (user.Roles.Any(r => r.Id == settings.ModRole)) return Task.FromResult(PreconditionResult.FromSuccess());
// Check for moderated mode
if (settings.ModMode) return Task.FromResult(PreconditionResult.FromError(FailModerated));
// Check if user exists in blocklist
if (db.BlocklistEntries.Where(row => row.GuildId == (long)guild.Id && row.UserId == (long)user.Id).Any())
return Task.FromResult(PreconditionResult.FromError(FailBlocked));
}
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return Task.FromResult(PreconditionResult.FromSuccess());
}
}