raas-proxy/raas-proxy.js

Rule as a Service (RaaS), change business rules on the fly from any browser. Quick integration, parallel execution, approval workflow and more..

//Author: Bobby Thomas (bobtxt@gmail.com)
let axios = require('axios');

module.exports = function (subscribeToken, proxyBearerToken, learningMode=false) {
	
	console.log('RaaS Initializing ..');
	
	let ruleEventLists = new Map();
	
	if(!learningMode){
		getRuleToTrigger((data)=> {
			ruleEventLists = data;
		});
	}
	
	return async function (req, res, next) {
		next(); //Return immidiatily so that the actual Api call is not delayed
		
		if(!req.body){
			console.log('RaaS Warning: Make sure you have a "bodyParser" middleware installed.');
		}
		
		let pattern = req.originalUrl.toLowerCase().replace(/\/[0-9]+/g,'');
		let match = `${req.method.toLowerCase()}:${pattern}`;
		let matchingRules = ruleEventLists.get(match);
		if(learningMode || (matchingRules && matchingRules.length > 0)){
			try {				
				let params = { 
					//rules: matchingRules.map(x=> ruleLists.get(x)),
					url: req.originalUrl.toLowerCase(), 
					method: req.method, 
					body: JSON.stringify(req.body), 
					param: JSON.stringify(req.params), 
					subscription: JSON.stringify(subscribeToken),
					token: JSON.stringify(proxyBearerToken), 
				};
								
				let a = await sendToPolicyEngine(params);
				console.log(a);
			}
			catch(ex){
				console.log('RaaS Error: ', ex);
			}
		}
		else{
			//console.log('RaaS Info: No rules captured.');
		}	
		
		console.log('------------ Scanned by RaaS ------------');		
	}
	
		
	async function sendToPolicyEngine(params){
		let url = 'https://7ijcibrpvf.execute-api.us-east-1.amazonaws.com/prod';
		const response = await axios.post(url, params);
		return response.data;
	}
	
	async function getRuleToTrigger(cb){
		let url = 'https://gr4m466yx1.execute-api.us-east-1.amazonaws.com/prod';
		const response = await axios.get(url);
		let ruleEventLists = new Map();
		response.data.map(x=>{
			ruleEventLists.set(x, 0);
		});
		cb(ruleEventLists);
	}
	
	async function longPolling(){
		let url = 'https://d5h5fxomug.execute-api.us-east-1.amazonaws.com/prod';
		const response = await axios.get(url); //After 20 seconds this line returns
		console.log(response.data);
		if(response.data.available){
			dataAvailable(response.data);
		}
		//longPolling();
	}
	
	
	function dataAvailable(data){
		//Trigger Transmute Action by calling local API
	}
}