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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 "..";
import addFormats from "ajv-formats";
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,
strict: true,
strictRequired: true
});
addFormats(ajv);
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>;
};
}
// Normalizer is introduced to workaround https://github.com/ajv-validator/ajv/issues/1287
// this removes null values as ajv doesn't treat them as undefined
// normalizeBody allows to handle circular structures without issues
// taken from https://github.com/serverless/serverless/blob/master/lib/classes/ConfigSchemaHandler/index.js#L30 (MIT license)
const normalizeBody = (body: any = {}) => {
const normalizedObjectsSet = new WeakSet();
const normalizeObject = (object: any) => {
if (normalizedObjectsSet.has(object)) return;
normalizedObjectsSet.add(object);
if (Array.isArray(object)) {
for (const [index, value] of object.entries()) {
if (typeof value === "object") normalizeObject(value);
}
} else {
for (const [key, value] of Object.entries(object)) {
if (value == null) {
if (key === "icon" || key === "avatar" || key === "banner" || key === "splash") continue;
delete object[key];
} else if (typeof value === "object") {
normalizeObject(value);
}
}
}
};
normalizeObject(body);
return body;
};
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);
const permission = await getPermission(req.user_id, req.params.guild_id, req.params.channel_id);
// 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(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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