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/*
Fosscord: A FOSS re-implementation and extension of the Discord.com backend.
Copyright (C) 2023 Fosscord and Fosscord Contributors
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/>.
*/
import {
ajv,
DiscordApiErrors,
EVENT,
FieldErrors,
FosscordApiErrors,
getPermission,
getRights,
normalizeBody,
PermissionResolvable,
Permissions,
RightResolvable,
Rights,
} from "@fosscord/util";
import { NextFunction, Request, Response } from "express";
import { AnyValidateFunction } from "ajv/dist/core";
declare global {
// TODO: fix this
// eslint-disable-next-line @typescript-eslint/no-namespace
namespace Express {
interface Request {
permission?: Permissions;
}
}
}
export type RouteResponse = {
status?: number;
body?: `${string}Response`;
headers?: Record<string, string>;
};
export interface RouteOptions {
permission?: PermissionResolvable;
right?: RightResolvable;
body?: `${string}Schema`; // typescript interface name
test?: {
response?: RouteResponse;
body?: unknown;
path?: string;
event?: EVENT | EVENT[];
headers?: Record<string, string>;
};
}
export function route(opts: RouteOptions) {
let validate: AnyValidateFunction | undefined;
if (opts.body) {
validate = ajv.getSchema(opts.body);
if (!validate) throw new Error(`Body schema ${opts.body} not found`);
}
return async (req: Request, res: Response, next: NextFunction) => {
if (opts.permission) {
const required = new Permissions(opts.permission);
req.permission = await getPermission(
req.user_id,
req.params.guild_id,
req.params.channel_id,
);
// bitfield comparison: check if user lacks certain permission
if (!req.permission.has(required)) {
throw DiscordApiErrors.MISSING_PERMISSIONS.withParams(
opts.permission as string,
);
}
}
if (opts.right) {
const required = new Rights(opts.right);
req.rights = await getRights(req.user_id);
if (!req.rights || !req.rights.has(required)) {
throw FosscordApiErrors.MISSING_RIGHTS.withParams(
opts.right as string,
);
}
}
if (validate) {
const valid = validate(normalizeBody(req.body));
if (!valid) {
const fields: Record<
string,
{ code?: string; message: string }
> = {};
validate.errors?.forEach(
(x) =>
(fields[x.instancePath.slice(1)] = {
code: x.keyword,
message: x.message || "",
}),
);
throw FieldErrors(fields);
}
}
next();
};
}
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