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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 {
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?: any;
path?: string;
event?: EVENT | EVENT[];
headers?: Record<string, string>;
};
}
export function route(opts: RouteOptions) {
var validate: AnyValidateFunction<any> | 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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