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import { DiscordApiErrors, Event, EventData, getPermission, PermissionResolvable, Permissions } from "@fosscord/util";
import { NextFunction, Request, Response } from "express";
import fs from "fs";
import path from "path";
import Ajv from "ajv";
import { AnyValidateFunction } from "ajv/dist/core";
import { FieldErrors } from "..";
const SchemaPath = path.join(__dirname, "..", "..", "assets", "schemas.json");
const schemas = JSON.parse(fs.readFileSync(SchemaPath, { encoding: "utf8" }));
export const ajv = new Ajv({ allErrors: true, parseDate: true, allowDate: true, schemas, messages: true });
declare global {
namespace Express {
interface Request {
permission?: Permissions;
}
}
}
export type RouteSchema = string; // typescript interface name
export type RouteResponse = { status: number; body?: RouteSchema; headers?: Record<string, string> };
export interface RouteOptions {
permission?: PermissionResolvable;
body?: RouteSchema;
response?: RouteResponse;
example?: {
body?: any;
path?: string;
event?: EventData;
headers?: Record<string, string>;
};
}
export function route(opts: RouteOptions) {
var validate: AnyValidateFunction<any>;
if (opts.body) {
// @ts-ignore
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);
const permission = await getPermission(req.user_id, req.params.guild_id, req.params.channel_id);
console.log(required.bitfield, permission.bitfield, permission.bitfield & required.bitfield);
// bitfield comparison: check if user lacks certain permission
if (!permission.has(required)) {
throw DiscordApiErrors.MISSING_PERMISSIONS.withParams(opts.permission as string);
}
if (validate) {
const valid = validate(req.body);
if (!valid) {
const fields: Record<string, { code?: string; message: string }> = {};
validate.errors?.forEach((x) => (fields[x.instancePath] = { code: x.keyword, message: x.message || "" }));
throw FieldErrors(fields);
}
}
}
next();
};
}
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