event-manager.js
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event-manager.js
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	const Promise = require("bluebird");
	const PatternEmitter = require("pattern-emitter-promise").EventEmitter;
	PatternEmitter.setPromiseLibrary(Promise);

	class EventManager {
	constructor(app) {
	app.ee = PatternEmitter();
	app.on = app.ee.on.bind(app.ee);
	app.off = app.ee.off.bind(app.ee);
	app.emit = app.ee.emit.bind(app.ee);
	app.removeAllListeners = app.ee.removeAllListeners.bind(app.ee);
	this.app = app;
	}
	// TODO: this function is a symptom of leaking abstraction
	// we need to abstract logic of intentions that base on secret tokens
	subscribeToIntentionCreate(collection_name, template_name) {
	this.subscribeTo(
	collection_name,
	"create",
	"post",
	async (context, path, params, intent) => {
	const token = (await this.app.run_action(
	new this.app.Sealious.SuperContext(),
	["collections", collection_name, intent.id],
	"show"
	)).body.token;
	const message = await this.app.MailTemplates[template_name](
	this.app,
	{
	email_address: intent.body.email,
	token,
	}
	);
	return message.send(this.app);
	}
	);
	}
	subscribeTo(collection_pattern, action_name, when, callback) {
	this.app.on(
	new RegExp(
	`${when}:collections\.${collection_pattern}:${action_name}`
	),
	callback
	);
	}
	}

	module.exports = EventManager;