Southwest Auto Check-In

southwest.user.js

// ==UserScript==
// @name        Southwest Auto Check-In
// @namespace	http://dbknickerbocker.blogspot.com
// @description	Automatically check-in for Southwest flights
// @include	https://southwest.com/flight/retrieveCheckinDoc*
// @include	https://www.southwest.com/flight/retrieveCheckinDoc*
// @include	https://southwest.com/flight/selectPrintDocument*
// @include	https://www.southwest.com/flight/selectPrintDocument*
// @updateURL	https://gist.github.com/dbknickerbocker/5730976/raw/southwest.user.js
// @author	David B. Knickerbocker
// @version	0.3
// ==/UserScript==

var SECOND_IN_MSEC = (1000);
var MINUTE_IN_MSEC = (SECOND_IN_MSEC * 60);
var HOUR_IN_MSEC = (MINUTE_IN_MSEC * 60);
var DAY_IN_MSEC = (HOUR_IN_MSEC * 24);

var TIMEOUT_MAX_MSEC = (DAY_IN_MSEC * 24);

function southwestCheckInForm() {
	return document.getElementById('itineraryLookup');
}

function submitSouthwestCheckInForm() {
	try {
		southwestCheckInForm().submit();
	} catch (exception) {
		alert("Unknown error has occured - You're on your own! :" + exception.message);		
	}
}

function countdownDiv() {
	return document.getElementById('countdown');
}

function insertBreak(element) {
	element.appendChild(document.createElement('br'));	
}

function insertText(element, text) {
	element.appendChild(document.createTextNode(text));
}

function insertTextWithBoldStyle(element, text) {
	var span = document.createElement('span');
	span.style.fontWeight = 'bold';
	insertText(span, text);
	element.appendChild(span);
}

function removeAllChildrenFromElement(element) {
	while (element.firstChild) {
		element.removeChild(element.firstChild);
	}
}

function zeroPad(value) {
	return (value < 10) ? '0' + value : value;
}

function displayCountdown(checkInDate) {
	try {
		var countdown = countdownDiv();
	
		removeAllChildrenFromElement(countdown);
		
		var timeRemainingMsec = checkInDate - new Date();
		if (timeRemainingMsec <= 0) {
			insertTextWithBoldStyle(countdown, 'Checking in now...');
			insertBreak(countdown);
			return;
		}
		
		var days = Math.floor(timeRemainingMsec / DAY_IN_MSEC);
		var hours = Math.floor(timeRemainingMsec / HOUR_IN_MSEC) % 24;
		var minutes = Math.floor(timeRemainingMsec / MINUTE_IN_MSEC) % 60;
		var seconds = Math.floor(timeRemainingMsec / SECOND_IN_MSEC) % 60;
	
		insertBreak(countdown);
		insertTextWithBoldStyle(countdown, 'Check-in time: ');
		insertText(countdown, checkInDate.toString());
		insertBreak(countdown);
		
		insertTextWithBoldStyle(countdown, 'Time remaining until automatic check-in: ');		
		insertText(countdown, zeroPad(days) + ' DAY ' + zeroPad(hours) + ' HRS ' + zeroPad(minutes) + ' MIN ' + zeroPad(seconds) + ' SEC');
		insertBreak(countdown);
		insertBreak(countdown);
	} catch (exception) {
		alert("Unknown error has occured - You're on your own! :" + exception.message);
	}
}

function elementByIdValueAsInteger(id) {
	return parseInt(document.getElementById(id).value, 10);
}

function getFlightDate() {
	var month = elementByIdValueAsInteger('month-input') - 1;
	var day = elementByIdValueAsInteger('day-input');
	var year = elementByIdValueAsInteger('year-input');
	
	var hours = elementByIdValueAsInteger('hour-input');
	var minutes = elementByIdValueAsInteger('minute-input');
	var seconds = elementByIdValueAsInteger('second-input');
	
	var flightDate = new Date(year, month, day, hours, minutes, seconds, 0);
	if ((flightDate.getMonth() != month) || (flightDate.getDate() != day) || (flightDate.getFullYear() != year) ||
			(flightDate.getHours() != hours) || (flightDate.getMinutes() != minutes) || (flightDate.getSeconds() != seconds)) {
		return null;
	}
	
	return flightDate;
}

function displayUnderOneHourError() {
	insertAutoCheckInFormWithError('Unable to check-in when flight is within one hour.');
}

function displayInvalidDateError() {
	insertAutoCheckInFormWithError('Invalid Date!');
}

function displayMaxTimeoutError() {
	var maxFlightDateToSatisfyMaxTimeout = new Date(new Date().getTime() + TIMEOUT_MAX_MSEC + DAY_IN_MSEC);
	insertAutoCheckInFormWithError('Your flight must be before: ' + maxFlightDateToSatisfyMaxTimeout);
}

function displayFlightInPastError(flightDate) {
	insertAutoCheckInFormWithError('You already missed your flight: ' + flightDate);
}

function startAutoCheckInCountdown() {
	try {
		var flightDate = getFlightDate();
		if (flightDate === null) {
			displayInvalidDateError();
			return;
		}
		
		var timeRemainingToFlightMsec = (flightDate - new Date());
		if (timeRemainingToFlightMsec < 0) {
			displayFlightInPastError(flightDate);
			return;
		}
		
		if (timeRemainingToFlightMsec <= HOUR_IN_MSEC) {
			displayUnderOneHourError();
			return;
		}
		
		if (timeRemainingToFlightMsec <= DAY_IN_MSEC) {
			submitSouthwestCheckInForm();
			return;
		}
		
		var timeRemainingToCheckInMsec = timeRemainingToFlightMsec - DAY_IN_MSEC;
		if (timeRemainingToCheckInMsec > TIMEOUT_MAX_MSEC) {
			displayMaxTimeoutError();
			return;
		}

		var checkInDate = new Date(flightDate.getTime() - DAY_IN_MSEC);
		
		window.setTimeout(submitSouthwestCheckInForm, timeRemainingToCheckInMsec);
		window.setInterval(function () {
				displayCountdown(checkInDate);
			}, SECOND_IN_MSEC);
	} catch (exception) {
		alert("Unknown error has occured - You're on your own! :" + exception.message);
	}
}

function insertInput(element, id, value, length) {
	var input = document.createElement('input');
	input.id = id;
	input.type = 'text';
	input.maxLength = length;
	input.size = length;
	input.value = value;
	input.setAttribute('onfocus', "if (this.value === '" + value + "') { this.value = ''; }");
	element.appendChild(input);
}

function insertLabel(element, text, id) {
	var label = document.createElement('label');
	label.setAttribute('for', id);
	label.textContent = text;
	element.appendChild(label);
}

function insertH4(element, text) {
	var h4 = document.createElement('h4');
	h4.textContent = text;
	element.appendChild(h4);
	return h4;
}

function insertH4WithColor(element, text, color) {
	var h4 = insertH4(element, text);
	h4.style.color = color;
}

function createAutoCheckInForm() {
	var autoCheckInForm = document.createElement('form');
	autoCheckInForm.setAttribute('method', 'POST');
	
	insertH4(autoCheckInForm, 'When is your flight?');
	insertBreak(autoCheckInForm);
	
	insertLabel(autoCheckInForm, 'Date: ', 'month-input');
	insertInput(autoCheckInForm, 'month-input', 'mm', '2');
	insertText(autoCheckInForm, '/');
	insertInput(autoCheckInForm, 'day-input', 'dd', '2');
	insertText(autoCheckInForm, '/');
	insertInput(autoCheckInForm, 'year-input', 'yyyy', '4');
	insertBreak(autoCheckInForm);
	
	insertLabel(autoCheckInForm, 'Time (24 hr): ', 'hour-input');
	insertInput(autoCheckInForm, 'hour-input', 'hh', '2');
	insertText(autoCheckInForm, ':');
	insertInput(autoCheckInForm, 'minute-input', 'mm', '2');
	insertText(autoCheckInForm, ':');
	insertInput(autoCheckInForm, 'second-input', 'ss', '2');
	insertBreak(autoCheckInForm);
	insertBreak(autoCheckInForm);
	
	var startAutoCheckInButton = document.createElement('input');
	startAutoCheckInButton.id = 'auto-check-in-button';
	startAutoCheckInButton.type = 'button';
	startAutoCheckInButton.value = 'Start Auto Check-In';
	startAutoCheckInButton.addEventListener('click', startAutoCheckInCountdown, true);
	
	autoCheckInForm.appendChild(startAutoCheckInButton);
	
	return autoCheckInForm;
}

function insertChildBefore(child, element) {
	element.parentNode.insertBefore(child, element);
}

function removePreviousCountdownDiv() {
	var countdown = countdownDiv();
	if ((countdown !== null) && (countdown.parentNode !== null)) {
		countdown.parentNode.removeChild(countdown);
	}	
}

function insertCountdownDivWithElements(elements) {
	removePreviousCountdownDiv();
	
	var countdownDiv = document.createElement('div');
	countdownDiv.id = 'countdown';
	
	countdownDiv.style.backgroundColor = '#F3F5FF';
	countdownDiv.style.borderRadius = '10px';
	countdownDiv.style.padding = '20px';
	
	for (var i = 0; i < elements.length; ++i) {
		countdownDiv.appendChild(elements[i]);
	}
	
	insertChildBefore(countdownDiv, southwestCheckInForm());
}

function createErrorNode(error) {
	var div = document.createElement('div');
	insertH4WithColor(div, error, 'red');
	insertBreak(div);
	return div;
}

function insertAutoCheckInFormWithError(error) {
	insertCountdownDivWithElements([createErrorNode(error), createAutoCheckInForm()]);
}

function insertAutoCheckInForm() {
	insertCountdownDivWithElements([createAutoCheckInForm()]);
}

function countdownDivPresent() {
	return (countdownDiv() !== null);
}

function checkForDepartureTimeOops() {
	try {
		var errorsUl = document.querySelector('ul#errors');
		if (errorsUl === null) {
			return;
		}
		
		var errors = errorsUl.getElementsByTagName('li');
		for (var i = 0; i < errors.length; ++i) {
			if (errors[i].textContent.indexOf('more than 24 hours prior') >= 0) {
				insertAutoCheckInForm();
				break;
			}
		}
	} catch (exception) {
		alert("Unknown error has occured - You're on your own! :" + exception.message);
	}
}

function selectAllPassengers() {
	var inputs = document.getElementsByTagName('input');
	for (var i = 0; i < inputs.length; ++i) {
		var input = inputs[i];
		if (input.getAttribute('type') == 'checkbox') {
			input.checked = true;
		}
	}
}

function printDocuments() {
	try {
		var printButton = document.getElementById('printDocumentsButton');
		if (printButton === null) {
			return;
		}
	
		selectAllPassengers();
		printButton.click();
	} catch (exception) {
		alert("Unknown error has occured - You're on your own! :" + exception.message);		
	}
}

if (document.location.href.indexOf('retrieveCheckinDoc') >= 0) {
	if (!countdownDivPresent()) {
		checkForDepartureTimeOops();
	}
} else if (document.location.href.indexOf('selectPrintDocument') >= 0) {
	printDocuments();
}