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index.js
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index.js
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const assert = require('assert');
const CryptoJS = require("crypto-js");
const fs = require('fs');
const generator = require('generate-password');
const Mustache = require('mustache');
const Config = require('./config.json');
const People = require('./people.json');
console.log("Starting up");
function find_path(persons){
var vertices = [];
var temp = JSON.parse(JSON.stringify(persons));
while (Object.keys(temp).length > 0) {
var cur = Object.keys(temp)[0];
var vertex = [];
while (cur != null) {
vertex.push(cur)
cur = temp[cur].give_to
}
cur = temp[Object.keys(temp)[0]].receive_from
while (cur != null) {
vertex.unshift(cur)
cur = temp[cur].give_to
}
vertices.push(vertex);
for (key of vertex){
delete temp[key];
}
}
vertices = shuffle(vertices);
var vert = vertices.pop();
while (vertices.length > 0) {
var tail = vert[vert.length - 1];
var places = [];
for (var i = 0; i < vertices.length; i++) {
if (!persons[tail].nomatch.includes(vertices[i][0])) {
places.push(i);
}
}
if (places.length == 0) {
return null;
}
places = shuffle(places);
var index = places[0]
vert = vert.concat(vertices[index]);
vertices.splice(index, 1);
}
//console.log(vert);
if (persons[vert[vert.length - 1]].nomatch.includes(vert[0])) {
console.log("Tail can't give to head");
return null;
}
return vert;
}
var links = null;
for (var i = 0; i < 100; i++) {
links = find_path(People);
if (links != null) {
console.log("Number of tries to find path: ", i + 1);
break;
}
}
if (links == null) {
console.log("Couldn't find a valid path after 100 tries");
return -1;
}
for (var i = 0; i < links.length; i++) {
People[links[i]].give_to = links[(i+1) % links.length];
People[links[(i+1) % links.length]].receive_from = links[i];
}
console.log("Assignments completed 🎄", links);
var assignment_template = fs.readFileSync('./templates/assignment.html', 'utf8');
Mustache.parse(assignment_template); // optional, speeds up future uses
var crypt_template = fs.readFileSync('./templates/staticcrypt.html', 'utf8');
Mustache.parse(crypt_template);
var index_template = fs.readFileSync('./templates/index.html', 'utf8');
Mustache.parse(index_template);
if (!fs.existsSync('./site')){
fs.mkdirSync('./site');
}
links = links.sort();
var persons = [];
for (name of links) {
persons.push({"name": name});
}
fs.writeFileSync('./site/index.html', Mustache.render(index_template, {"persons": persons}), 'utf-8');
copyFile('./images/logo.gif', './site/logo.gif');
for (person of Object.values(People)) {
if (!fs.existsSync('./site/' + person.name)){
fs.mkdirSync('./site/' + person.name);
}
var unencrypted = Mustache.render(assignment_template, {
"name": person.give_to,
"date":Config.date
});
var passphrase = generator.generate({
length: 15,
numbers: true
});
person.password = passphrase;
// Encrypt
var encrypted = CryptoJS.AES.encrypt(unencrypted, passphrase);
var hmac = CryptoJS.HmacSHA256(encrypted.toString(), CryptoJS.SHA256(passphrase)).toString();
var encryptedMsg = hmac + encrypted;
var params = {
"instructions": Config.instructions,
"encrypted": encryptedMsg,
"title": "🎄 " + person.name + "'s Secret Santa Assignment"}
var final = Mustache.render(crypt_template, params);
var encryptedMsg = encryptedMsg,
encryptedHMAC = encryptedMsg.substring(0, 64),
encryptedHTML = encryptedMsg.substring(64),
decryptedHMAC = CryptoJS.HmacSHA256(encryptedHTML, CryptoJS.SHA256(passphrase)).toString();
if (decryptedHMAC !== encryptedHMAC) {
console.log('Bad passphrase !');
return;
}
var plainHTML = CryptoJS.AES.decrypt(encryptedHTML, passphrase).toString(CryptoJS.enc.Utf8);
fs.writeFileSync('./site/' + person.name + '/index.html', final , 'utf-8');
}
var output = []
for (person of Object.values(People)) {
output.push({
'name': person.name,
'email': person.email,
'password': person.password
})
}
var final = JSON.stringify(output);
fs.writeFileSync('final.json', final , 'utf-8');
function copyFile(src, dest) {
let readStream = fs.createReadStream(src);
readStream.once('error', (err) => {
console.log(err);
});
readStream.once('end', () => {
console.log('done copying');
});
readStream.pipe(fs.createWriteStream(dest));
}
function shuffle(array) {
var currentIndex = array.length, temporaryValue, randomIndex;
// While there remain elements to shuffle...
while (0 !== currentIndex) {
// Pick a remaining element...
randomIndex = Math.floor(Math.random() * currentIndex);
currentIndex -= 1;
// And swap it with the current element.
temporaryValue = array[currentIndex];
array[currentIndex] = array[randomIndex];
array[randomIndex] = temporaryValue;
}
return array;
}