tiny framework for aws lambda

handler_aws.js

const Application = require('./Application')();
var { s2o, o2s, o2o, tryRequire, flag_production, approot } = Application;
//var Access_Control_Allow_Headers = (h)=>{ var rt=['origin', 'content-type','accept']; for(var k in h){rt.push(k)}; return rt; };
var Access_Control_Allow_Headers = (h)=> ['origin', 'content-type','accept'].concat( Object.keys(h)||[] );
var loadtime_handler_aws = new Date();
module.exports = async(event, context) => {
	try {
		var statusCode = 200;
		var { queryStringParameters, httpMethod, body, path, requestContext} = event || {};
		var headers = {
			'Access-Control-Allow-Origin': '*',
			'Access-Control-Allow-Headers':Access_Control_Allow_Headers(event.headers).join(','),
			'Access-Control-Allow-Methods':'GET,POST',
			"Access-Control-Allow-Credentials": "true",
			"Access-Control-Max-Age": 1728000,
		};
		if(httpMethod=='GET'||httpMethod=='POST'||httpMethod==null){
		}else{ throw new Error(`NOT ALLOW method ${httpMethod}`); }
		var body_raw = body;
		var post_o = s2o(body_raw) || {};
		var get_o = queryStringParameters || {};
		var request_o = o2o(get_o, post_o);
		var { c, m } = request_o || {};
		var mm;
		if (path) {
			var u, mmm;
			if (mmm = path.match(/.*\/([a-zA-Z0-9_]*)\.([a-zA-Z0-9_]+)(\.api)?$/)) // [C.M,.M,C.M.api,.M.api]
			{ [u, c, m] = mmm; }
			else if (mmm = path.match(/.*\/([a-zA-Z0-9_]+)(\.api)?$/))// [M,M.api]
			{ [u, m] = mmm; }
			mm = m;
		}
		//else if (requestContext) mm = 'HandleWebSocket';
		else { c = 'Default', mm = 'GetVersion' };//when w- path
		if (!c) c = 'Default'; //to ApiDefault
		if (!mm) mm = 'Index'; //to .Index
		if (c.substr(0, 3) != "Api") c = "Api" + c;
		var req = {
			loadtime_handler_aws,
			time_req:new Date(),
			request_o,
			post_o,
			get_o,
			event,
			body_raw,
			region: process.env.AWS_REGION
			//@ref http://docs.aws.amazon.com/lambda/latest/dg/current-supported-versions.html#lambda-environment-variables
		}, res = { headers };
		var cc;
		var _logicModule = tryRequire(approot + '/' + c, !flag_production);
		if (_logicModule) cc = new _logicModule(Application, /*Server=*/{ req, res, c, m });

		if(cc&&cc[mm]){
			var rst	= await cc[mm](request_o);
		}else{
			rst = (`404 ${path} ${c}.${mm} ${httpMethod}`);
		}
		if('string'==typeof rst){
			body = rst;
			headers['content-type'] = 'text/html';
		}else{
			body = o2s(rst);
		}
	}
	catch (err) {
		body = '500 '+err;
	}
	return { statusCode, body, headers };
}

exports.handler = require('./handler_aws');