Reddit Comment Posting using only request-promise and session cookies

reddit_comment.js

/*
 * The purpose of this excercise was to understand how to preserve a session
 * using only request-promise (https://www.npmjs.com/package/request-promise)
 *
 * USAGE:
 *
 * Grab dependencies:
 * $ npm --save request
 * $ npm --save request-promise
 *
 * Execute with proper command line args:
 * $ node reddit_comment.js -u 'reddit-username' -p 'reddit-password' -t 'thing-id you wish to comment on' -c 'comment text'
*/
var req = require('request-promise');

var ui = process.argv.indexOf('-u');
var pi = process.argv.indexOf('-p');
var ti = process.argv.indexOf('-t');
var ci = process.argv.indexOf('-c');
if (ui === -1 || pi === -1 || ti === -1) {
	throw TypeError('you must provide -u [username], -p [password], -t [comment ID], -c [comment text] command line args');
}

var username = process.argv[ui+1];
var password = process.argv[pi+1];
var thingID = process.argv[ti+1];
var comment = process.argv[ci+1];
var j = req.jar();
var url = 'http://www.reddit.com';

console.log('ATTEMPTING LOGIN');
req({
	uri: url + '/api/login/' + username,
	method: 'POST',
	jar: j,
	form: {
		op: 'login',
		user: username,
		passwd: password,
		api_type: 'json'
	},
	resolveWithFullResponse: true
})
.then(function(args) {
	console.log('LOGIN SUCCESS');
	for (var i = 0; i < args.headers['set-cookie'].length; i++) {
		var cookie = req.cookie(args.headers['set-cookie'][i]);
		j.setCookie(cookie, url);
	}
	console.log('VISITING HOMEPAGE POST-LOGGED-IN');
	// Reddit provides CSRF protection in the form of a "uh" value.
	// go back to homepage in order to pick up "uh" relevant for session
	return req({
		uri: url,
		method: 'GET',
		jar: j,
		resolveWithFullResponse: true
	})
})
.then(function(args) {
	var uh = /name="uh" value="([^"]+)"/.exec(args.body)[1];
	
	console.log('"UH" VALUE FOUND, ATTEMPTING TO POST COMMENT');
	return req({
		uri: url + '/api/comment',
		method: 'POST',
		jar: j,
		form: {
			thing_id: thingID,
			text: comment,
			id: '#commentreply_' + thingID,
			r: 'pics',
			uh: uh,
			renderstyle: 'html'
		},
		resolveWithFullResponse: true,
		followAllRedirects: true        // NEEDED FOR POSTS ONLY
	})
})
.then(function(args) {
	console.log('COMMENT POST SUCCESS');
})
.catch(function(args) {
	console.log('THERE WAS AN ERROR SOMEWHERE');
	Object.keys(args).forEach(function(arg) { console.log(arg); });
});