feat: ignore channel commands

Catalogger.Backend/Services/PermissionResolverService.cs

@@ -0,0 +1,93 @@
+// Copyright (C) 2021-present sam (starshines.gay)
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published
+// by the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+using Catalogger.Backend.Cache;
+using Catalogger.Backend.Cache.InMemoryCache;
+using Catalogger.Backend.Extensions;
+using Remora.Discord.API.Abstractions.Objects;
+using Remora.Discord.API.Objects;
+using Remora.Rest.Core;
+
+namespace Catalogger.Backend.Services;
+
+public class PermissionResolverService(
+    IMemberCache memberCache,
+    RoleCache roleCache,
+    ChannelCache channelCache
+)
+{
+    public async Task<IDiscordPermissionSet> GetGuildPermissionsAsync(
+        Snowflake guildId,
+        Snowflake userId
+    )
+    {
+        var member = await memberCache.TryGetAsync(guildId, userId);
+        return member == null ? DiscordPermissionSet.Empty : GetGuildPermissions(guildId, member);
+    }
+
+    public async Task<IDiscordPermissionSet> GetChannelPermissionsAsync(
+        Snowflake guildId,
+        Snowflake userId,
+        Snowflake channelId
+    )
+    {
+        if (!channelCache.TryGet(channelId, out var channel))
+            return DiscordPermissionSet.Empty;
+        return await GetChannelPermissionsAsync(guildId, userId, channel);
+    }
+
+    public async Task<IDiscordPermissionSet> GetChannelPermissionsAsync(
+        Snowflake guildId,
+        Snowflake userId,
+        IChannel channel
+    )
+    {
+        var member = await memberCache.TryGetAsync(guildId, userId);
+        return member == null
+            ? DiscordPermissionSet.Empty
+            : GetChannelPermissions(guildId, member, channel);
+    }
+
+    public IDiscordPermissionSet GetGuildPermissions(Snowflake guildId, IGuildMember member)
+    {
+        var roles = roleCache.GuildRoles(guildId).ToList();
+        var everyoneRole = roles.First(r => r.ID == guildId);
+        var memberRoles = roles.Where(r => member.Roles.Contains(r.ID)).ToList();
+
+        return DiscordPermissionSet.ComputePermissions(
+            member.User.GetOrThrow().ID,
+            everyoneRole,
+            memberRoles
+        );
+    }
+
+    public IDiscordPermissionSet GetChannelPermissions(
+        Snowflake guildId,
+        IGuildMember member,
+        IChannel channel
+    )
+    {
+        var roles = roleCache.GuildRoles(guildId).ToList();
+        var everyoneRole = roles.First(r => r.ID == guildId);
+        var memberRoles = roles.Where(r => member.Roles.Contains(r.ID)).ToList();
+
+        return DiscordPermissionSet.ComputePermissions(
+            member.User.GetOrThrow().ID,
+            everyoneRole,
+            memberRoles,
+            channel.PermissionOverwrites.OrDefault()
+        );
+    }
+}