const Handlebars = require('handlebars');
const { sjs, attr } = require("slow-json-stringify");
const GREETING = "Hello, World!";
const headerTypes = {
plain: 'text/plain',
json: 'application/json',
html: 'text/html; charset=UTF-8'
};
function sortByMessage(arr) {
const n = arr.length;
for (let i = 1; i < n; i++) {
const c = arr[i];
let j = i - 1;
while (j > -1 && c.message < arr[j].message) {
arr[j + 1] = arr[j];
j--;
}
arr[j + 1] = c;
}
return arr;
}
function generateRandomNumber(){
return Math.ceil(Math.random() * 10000);
}
const jsonSerializer = sjs({ message: attr("string") });
const worldObjectSerializer = sjs({ id: attr("number"), randomnumber: attr("number")});
const escapeHTMLRules = { '&': '&', '<': '<', '>': '>', '"': '"', "'": ''', '/': '/' }
const unsafeHTMLMatcher = /[&<>"'\/]/g
function escapeHtmlFromText(text) {
if (unsafeHTMLMatcher.test(text) === false) return text;
return text.replace(unsafeHTMLMatcher, function (m) { return escapeHTMLRules[m] || m; });
}
function writeResponse(res, text, type = headerTypes["json"]) {
res.writeHead(200, {
"content-type": type,
server: "Node",
});
res.end(text);
}
const self = (module.exports = {
sortByMessage,
generateRandomNumber,
jsonSerializer,
worldObjectSerializer,
escapeHtmlFromText,
writeResponse,
headerTypes,
additionalFortune: () => ({
id: 0,
message: "Additional fortune added at request time.",
}),
fortunesTemplate: Handlebars.compile(
[
"",
"",
"Fortunes",
"",
"",
"",
"| id | ",
"message | ",
"
",
"{{#fortunes}}",
"",
"| {{id}} | ",
"{{message}} | ",
"
",
"{{/fortunes}}",
"
",
"",
"",
].join("")
),
randomTfbNumber: () => Math.floor(Math.random() * 10000) + 1,
fillArray: (value, len) => {
const arr = [];
for (let i = 0; i < len; i++) {
arr.push(value);
}
return arr;
},
addTfbHeaders: (res, headerType) => {
res.setHeader('Server', 'Node');
res.setHeader('Content-Type', headerTypes[headerType]);
},
responses: {
jsonSerialization: (req, res) => {
writeResponse(res, jsonSerializer({ message: GREETING }));
},
plaintext: (req, res) => {
writeResponse(res, GREETING, headerTypes['plain']);
},
routeNotImplemented: (req, res) => {
res.writeHead(501, { "Content-Type": "text/plain; charset=UTF-8" });
const reason = {
reason: "`" + req.url + "` is not an implemented route",
};
res.end(JSON.stringify(reason));
},
},
});