@appsemble/node-utils/tinyRouter.js

NodeJS utilities used by Appsemble internally.

import { has } from '@appsemble/utils';
import { throwKoaError } from './koa.js';
/**
 * A tiny dynamic router middleware for GET requests.
 *
 * @param routes The routes to serve.
 * @returns Middleware that serves middleware matching the route regex.
 */
export function tinyRouter(routes) {
    return (ctx, next) => {
        const { method, path } = ctx;
        let match;
        const result = routes.find(({ route }) => {
            if (typeof route === 'string') {
                return path === route;
            }
            match = path.match(route) ?? undefined;
            return match;
        });
        if (!result) {
            return next();
        }
        let m = method.toLowerCase();
        if (!has(result, m)) {
            if (!has(result, 'any')) {
                throwKoaError(ctx, 405, 'Method not allowed');
            }
            m = 'any';
        }
        ctx.params = match?.groups ? { ...match.groups } : undefined;
        return result[m]?.(ctx, next);
    };
}
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