134 lines
4.3 KiB
JavaScript
134 lines
4.3 KiB
JavaScript
//schedule.js
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/**
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* Module for parsing downloaded schedule pages into useable/readable JSON objects.
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* Usually used after a lookup with the supplied information from it.
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* @module schedule
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*/
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//Import first-party modules.
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var url = require('url');
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//Import third-party modules.
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var http = require('socks5-http-client');
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var cheerio = require('cheerio');
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//Import self-written modules.
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var config = require('./configuration');
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/**
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* Function being called by Express when the user requests a schedule.
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* @param {Object} req - Request object supplied by Express.
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* @param {Object} res - Response object supplied by Express.
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* @param {Function} next - Next function supplied by Express.
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*/
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function get(req, res, next) {
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getSchedule(req.match.url, function (json) {
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req.match.json = json;
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next();
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});
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}
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/**
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* Function for getting the information off of the schedule servers.
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* @param {String} url - The url of the page that needs to be downloaded.
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* @param {Function} callback - Callback function to return the downloaded information.
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*/
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function getSchedule(url, callback) {
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var options = url.parse(url);
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options.socksPort = config().torPort;
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options.socksHost = config().torHost;
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http.get(options, function (res) {
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var _download = '';
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res.on('data', function (data) {
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_download += data;
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});
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res.on('end', function () {
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callback(toJSON(_download));
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});
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});
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}
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/**
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* Function for getting the names of the schedules with Regular Expressions
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* @param {String} page - The downloaded page with schedule information.
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* @return {Array} names - An array populated with the schedule names (basic, week)
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*/
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function scheduleNames(page) {
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var extract = cheerio('table tr td[valign="bottom"] table tr td b, table tr td[valign="bottom"] table tr td a', page).text().split(/\s\s/);
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var tab = 0;
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var names = [];
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for (element of extract) {
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element != '' ? names.push({
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'letter': element.substr(0, 1),
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'value' : element.match(/.*rooster|t\/m|\d\d\s\w{3}/gi).join(' ').slice(1).toLowerCase(),
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'tab': tab++
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}) : null;
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}
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return names;
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}
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/**
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* Function for converting the page (string) into a JSON datastructure.
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* @param {String} page - The downloaded page with schedule information.
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* @return {Object} scheduleData - The converted JSON datastructure.
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*/
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function toJSON(page) {
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var result = cheerio('td:nth-child(3) table', page);
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var names = scheduleNames(page);
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var isTeacher = cheerio(cheerio(page).find('tr.CoreDark').find('td')[3]).find('a').html() == null;
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var amountOfDays = cheerio(result).find('tr.AccentDark').find('td').length - 1;
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var amountOfHours = config().amountOfHours;
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var scheduleData = [];
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var offset = isTeacher ? 5 : 6;
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//Looping for amount of days
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for (day = 0; day < amountOfDays; day++) {
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scheduleData[day] = [];
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//Looping for amount of hours
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for (hour = 0; hour < amountOfHours; hour++) {
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var schedule = cheerio('tr:nth-child('+ (offset + hour) +')', result);
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//Looping for (optional) specialhours
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var specialHours = schedule.find('table').eq(day).children().length;
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scheduleData[day][hour] = {teacher: [], chamber: [], course: [], changed: []};
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for (subhour = 0; subhour < specialHours; subhour++) {
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var selectedHour = schedule.find('table').eq(day).find('tr').eq(subhour).find('td');
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//Give the value of the schedule hour to the fitting array.
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scheduleData[day][hour].teacher[subhour] = selectedHour.eq(0).text().replace(/\r|\n/g, '');
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scheduleData[day][hour].chamber[subhour] = selectedHour.eq(2).text();
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scheduleData[day][hour].course[subhour] = selectedHour.eq(4).text();
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//Check if the hour is 'changed' by the schedule authors, if so set to true.
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scheduleData[day][hour].changed[subhour] = selectedHour.eq(0).attr().class == 'tableCellNew' ? true : false;
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}
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}
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}
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scheduleData.names = names;
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return scheduleData;
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}
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/**
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* Function for doing a lookup in the database containing all records
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* of students, teachers and classrooms.
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* @param {Object} lookup - Object with all of the information from the request.
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* @param {Function} callback - Callback function for the API module.
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*/
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function api(lookup, callback) {
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getSchedule(lookup.data[0].url, callback);
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}
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//Exporting the schedule function.
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module.exports = {
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'get': get,
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'api': api
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};
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