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// https://github.com/discordjs/discord.js/blob/master/src/util/Permissions.js
// Apache License Version 2.0 Copyright 2015 - 2021 Amish Shah
import { MemberModel } from "../models/Member";
import { ChannelDocument, ChannelModel } from "../models/Channel";
import { ChannelPermissionOverwrite } from "../models/Channel";
import { Role, RoleModel } from "../models/Role";
import { BitField } from "./BitField";
export type PermissionResolvable = string | number | Permissions | PermissionResolvable[];
export class Permissions extends BitField {
static FLAGS = {
CREATE_INSTANT_INVITE: 1n << 0n,
KICK_MEMBERS: 1n << 1n,
BAN_MEMBERS: 1n << 2n,
ADMINISTRATOR: 1n << 3n,
MANAGE_CHANNELS: 1n << 4n,
MANAGE_GUILD: 1n << 5n,
ADD_REACTIONS: 1n << 6n,
VIEW_AUDIT_LOG: 1n << 7n,
PRIORITY_SPEAKER: 1n << 8n,
STREAM: 1n << 9n,
VIEW_CHANNEL: 1n << 10n,
SEND_MESSAGES: 1n << 11n,
SEND_TTS_MESSAGES: 1n << 12n,
MANAGE_MESSAGES: 1n << 13n,
EMBED_LINKS: 1n << 14n,
ATTACH_FILES: 1n << 15n,
READ_MESSAGE_HISTORY: 1n << 16n,
MENTION_EVERYONE: 1n << 17n,
USE_EXTERNAL_EMOJIS: 1n << 18n,
VIEW_GUILD_INSIGHTS: 1n << 19n,
CONNECT: 1n << 20n,
SPEAK: 1n << 21n,
MUTE_MEMBERS: 1n << 22n,
DEAFEN_MEMBERS: 1n << 23n,
MOVE_MEMBERS: 1n << 24n,
USE_VAD: 1n << 25n,
CHANGE_NICKNAME: 1n << 26n,
MANAGE_NICKNAMES: 1n << 27n,
MANAGE_ROLES: 1n << 28n,
MANAGE_WEBHOOKS: 1n << 29n,
MANAGE_EMOJIS: 1n << 30n,
};
any(permission: PermissionResolvable, checkAdmin = true) {
return (checkAdmin && super.has(Permissions.FLAGS.ADMINISTRATOR)) || super.any(permission);
}
/**
* Checks whether the bitfield has a permission, or multiple permissions.
*/
has(permission: PermissionResolvable, checkAdmin = true) {
return (checkAdmin && super.has(Permissions.FLAGS.ADMINISTRATOR)) || super.has(permission);
}
static channelPermission(overwrites: ChannelPermissionOverwrite[], init?: bigint) {
// channelOverwrites.filter((x) => x.type === 1 && x.id !== user.id);
return overwrites.reduce((permission, overwrite) => {
// apply disallowed permission
// * permission: current calculated permission (e.g. 010)
// * deny contains all denied permissions (e.g. 011)
// * allow contains all explicitly allowed permisions (e.g. 100)
return (permission & ~overwrite.deny) | overwrite.allow;
// ~ operator inverts deny (e.g. 011 -> 100)
// & operator only allows 1 for both ~deny and permission (e.g. 010 & 100 -> 000)
// | operators adds both together (e.g. 000 + 100 -> 100)
}, 0n ?? init);
}
static rolePermission(roles: Role[]) {
// adds all permissions of all roles together (Bit OR)
return roles.reduce((permission, role) => permission | role.permissions, 0n);
}
static finalPermission({
user,
guild,
channel,
}: {
user: { id: bigint; roles: bigint[] };
guild: { roles: Role[] };
channel?: {
overwrites?: ChannelPermissionOverwrite[];
};
}) {
let roles = guild.roles.filter((x) => user.roles.includes(x.id));
let permission = Permissions.rolePermission(roles);
if (channel?.overwrites) {
let overwrites = channel.overwrites.filter((x) => {
if (x.type === 0 && user.roles.includes(x.id)) return true;
if (x.type === 1 && x.id == user.id) return true;
return false;
});
permission = Permissions.channelPermission(overwrites, permission);
}
return permission;
}
}
export async function getPermission(user_id: bigint, guild_id: bigint, channel_id?: bigint) {
var member = await MemberModel.findOne({ guild_id, id: user_id }, "roles").exec();
if (!member) throw new Error("Member not found");
var roles = await RoleModel.find({ guild_id, id: { $in: member.roles } }).exec();
let channel: ChannelDocument | null = null;
if (channel_id) {
channel = await ChannelModel.findOne({ id: channel_id }, "permission_overwrites");
}
var permission = Permissions.finalPermission({
user: {
id: user_id,
roles: member.roles,
},
guild: {
roles: roles,
},
channel: {
overwrites: channel?.permission_overwrites,
},
});
return permission;
}
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