nadekobot/src/NadekoBot/PermissionChecker.cs

using NadekoBot.Modules.Permissions.Common;
using NadekoBot.Modules.Permissions.Services;

namespace NadekoBot;

public sealed class PermissionChecker : IPermissionChecker, INService
{
    private readonly PermissionService _perms;
    private readonly GlobalPermissionService _gperm;
    private readonly CmdCdService _cmdCds;
    private readonly IMessageSenderService _sender;
    private readonly CommandHandler _ch;

    public PermissionChecker(
        PermissionService perms,
        GlobalPermissionService gperm,
        CmdCdService cmdCds,
        IMessageSenderService sender,
        CommandHandler ch)
    {
        _perms = perms;
        _gperm = gperm;
        _cmdCds = cmdCds;
        _sender = sender;
        _ch = ch;
    }

    public async Task<PermCheckResult> CheckPermsAsync(
        IGuild guild,
        IMessageChannel channel,
        IUser author,
        string module,
        string? cmdName)
    {
        module = module.ToLowerInvariant();
        cmdName = cmdName?.ToLowerInvariant();

        if (cmdName is not null && await _cmdCds.TryBlock(guild, author, cmdName))
        {
            return new PermCooldown();
        }

        try
        {
            if (_gperm.BlockedModules.Contains(module))
            {
                return new PermGlobalBlock();
            }

            if (cmdName is not null && _gperm.BlockedCommands.Contains(cmdName))
            {
                return new PermGlobalBlock();
            }

            if (guild is SocketGuild sg)
            {
                var pc = _perms.GetCacheFor(sg.Id);
                if (!pc.Permissions.CheckPermissions(author, channel, cmdName, module, out var index))
                {
                    return new PermDisallowed(index,
                        pc.Permissions[index].GetCommand(_ch.GetPrefix(guild), sg),
                        pc.Verbose);
                }
            }
        }
        catch
        {
        }

        return new PermAllowed();
    }
}