138 lines
3.2 KiB
JavaScript
138 lines
3.2 KiB
JavaScript
/* eslint-disable no-console */
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/* eslint-disable no-sync */
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'use strict';
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const fs = require ('fs');
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const path = require ('path');
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/**
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* @typedef {object} options
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* @property {any} [opts] object to pass to the handlers
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* @property {string} [subdir] subdirectory for all requests
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* @property {boolean} [verbose] enable verbose logging
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* @property {boolean} [rethrow] rethrow errors (default: true)
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*/
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/**
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* @typedef {object} handler_description
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* @property {string} module_folder folder the module file is in
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* @property {string} file name of the module
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* @property {any} opts optional arguments
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* @property {boolean} rethrow should errors be rethrown
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*/
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/**
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* wrap a requestor handler to be compatible with express
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*
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* @param {handler_description} data handler data
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* @returns {Function} requestor handler
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*/
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function get_handler ({ module_folder, file, opts, rethrow }) {
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// eslint-disable-next-line global-require
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const handler = require (path.join (process.cwd (), module_folder, file));
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return (req, res, next) => {
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new Promise ((resolve) => resolve (handler (req, res, next, opts)))
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.catch ((e) => {
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if (rethrow)
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throw e;
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});
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};
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}
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/**
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* register a handler to the given app
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*
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* @param {any} app express app
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* @param {handler_description} handler_description data for the used handler
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* @param {string} method method to respond to
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* @param {string} url url to respond to
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* @param {boolean} verbose should verbose logging be enabled
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*/
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function register_handler (
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app,
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handler_description,
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method,
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url,
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verbose
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) {
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const handler = get_handler (handler_description);
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if (verbose) {
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console.log (
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`[requestor info] redirecting ${url} to ${handler_description.file}`
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);
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}
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switch (method) {
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case 'post':
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app.post (url, handler);
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break;
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case 'get':
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app.get (url, handler);
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break;
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case 'put':
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app.put (url, handler);
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break;
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case 'delete':
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app.delete (url, handler);
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break;
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case 'all':
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app.all (url, handler);
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break;
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default:
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if (verbose) {
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console.warn (
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`'${method}' did not match any request method, ignoring`
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);
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}
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break;
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}
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}
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/**
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* Load all request handlers in the given folder
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*
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* @param {any} app express app
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* @param {string} module_folder folder that contains all modules
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* @param {options} options additional options
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*/
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module.exports = function main (
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app,
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module_folder,
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options = { opts: null, subdir: '', verbose: false, rethrow: true }
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) {
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const { opts, subdir, verbose, rethrow } = options;
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for (const file of fs.readdirSync (module_folder)) {
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const regex = /(?<method>.*?)-(?<url>.*?)\.js/u;
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const { groups } = regex.exec (file);
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if (typeof subdir === 'undefined')
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groups.url = `/${groups.url}/`;
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else
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groups.url = `/${subdir}/${groups.url}/`;
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groups.url = groups.url
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.replace (/^\/[^/]*\/root/iu, '/')
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.replace (/\./gu, '/')
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.replace (/\/+/gu, '/');
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register_handler (
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app,
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{
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file,
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module_folder,
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opts,
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rethrow
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},
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groups.method,
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groups.url,
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verbose
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);
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}
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};
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