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index.js
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index.js
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const http = require('http');
const http2 = require('http2');
const fs = require('fs');
const zlib = require('zlib')
const util = require('util')
const dotenv = require('dotenv');
const path = require('path');
const jwt = require('jsonwebtoken')
const mimes = require('./utils/MIMETypes');
const database = require('./utils/database');
dotenv.config()
const httpPort = 80;
if (require.main == module) { // create HTTP Server
const httpServer = http.createServer();
httpServer.listen(httpPort,
() => console.log(`Server listening on port ${httpPort}`));
httpServer.on('request', handleHTTPRequest);
}
function handleHTTPRequest(request, response) {
console.log(createLogMessage(request.method, request.url));
redirectHTTPRequests(response, request.url)
}
function createLogMessage(method, route) {
return `${new Date}, ${method}, ${route}`
}
function redirectHTTPRequests(response, route) {
response.writeHead(301, {
'location': `${process.env.DOMAIN}${route}`
})
response.end()
}
if (require.main == module) { // create HTTPS Server
const port = 443;
const options = {
key: fs.readFileSync(process.env.KEY),
cert: fs.readFileSync(process.env.CERT),
ca: fs.readFileSync(process.env.CA),
allowHTTP1: true
}
const server = http2.createSecureServer(options);
server.listen(port, () => console.log(`HTTP2 Server listening on port ${port}`));
server.on('request', handleHTTP2Request);
}
function handleHTTP2Request(request, response) {
console.log(createLogMessage(request.method, request.url))
routeRequests(request, response);
}
function handleAPIPostRequest(request, response) {
if (request.method == 'POST' && isAPIRequest(request.url)) {
console.log(createLogMessage(request.method, request.url));
getAPIModule(request.url).main(request, response)
}
}
function routeRequests(request, response) {
const headers = request.headers;
const parsedUrl = new URL(request.url, process.env.DOMAIN);
if (isAPIRequest(request.url)) { // api routes request for data
if (request.method == 'GET') {
//handle get requests
handleAPIGetRequest(response, parsedUrl);
} else if (request.method == 'POST') {
handleAPIPostRequest(request, response)
}
} else if (isFileRequest(request.url)) {
handleFileRequest(response, request.url)
} else { // browser request
if (isAdminPageRequest(request.url) && !isAuthorized(headers.cookie)) {
const filePath = path.join(__dirname, 'frontend/html/unauthorized.html');
respondWithFile(response, filePath, 401)
} else {
handlePageRequest(request, response);
}
}
}
function isAPIRequest(route) {
const re = /^\/api\/.+/;
return re.test(route);
}
function isFileRequest(route) {
return Boolean(path.extname(route));
}
function handlePageRequest(request, response) {
const headers = request.headers;
const route = request.url;
if (headers['user-agent'] == 'thetalkingowl-puppeteer') {
handlePageRequestsFromPuppeteer(response, route);
} else {
handlePageRequestsFromUsers(response, route);
}
}
function handleFileRequest(response, route) {
const filePath = createFilePathFromFileRequest(route);
respondWithFile(response, filePath)
}
function createFilePathFromPageRequest(route) {
const parsedUrl = new URL(route, process.env.DOMAIN);
if (isHomePage(route)) {
return path.join(__dirname, `/frontend/html/home.html`)
} else {
return path.join(__dirname, `/frontend/html${parsedUrl.pathname}.html`)
}
}
function createFilePathFromFileRequest(route) {
return path.join(__dirname, route);
}
function createArticleFilePath() {
return path.join(__dirname, 'frontend/html/article.html')
}
function handlePageRequestsFromPuppeteer(response, route) {
let filePath;
if (path.dirname(route) == '/articles') {
filePath = createArticleFilePath()
} else {
filePath = createFilePathFromPageRequest(route);
}
respondWithFile(response, filePath)
}
function handlePageRequestsFromUsers(response, route) {
const parsedUrl = new URL(route, process.env.DOMAIN);
let filePath;
if (path.dirname(parsedUrl.pathname) == '/articles') {
const id = parsedUrl.searchParams.get('id');
filePath = path.join(__dirname, 'static', 'articles', `${id}.html`);
} else if (parsedUrl.pathname == '/') {
filePath = path.join(__dirname, 'static', 'home.html');
} else if (parsedUrl.pathname == '/business' || parsedUrl.pathname == '/technology') {
const pageNumber = parsedUrl.searchParams.get('page') || 1;
filePath = path.join(
__dirname,
'static',
parsedUrl.pathname,
`${pageNumber}.html`
);
} else {
filePath = path.join(__dirname, `/frontend/html${parsedUrl.pathname}.html`);
}
respondWithFile(response, filePath)
}
function isHomePage(route) {
if (route == '/') return true;
return false
}
async function respondWithFile(response, filePath, statusCode=200) {
const existing = await isExistingFile(filePath);
if (!existing) {
filePath = path.join(__dirname, 'frontend/html/error.html');
statusCode = 404;
}
response.writeHead(
statusCode,
{
'content-type': mimes.findMIMETypeFromExtension(path.extname(filePath)),
'content-encoding': 'gzip',
'cache-control': 'max-age=1209600'
}
)
fs.createReadStream(filePath)
.pipe(zlib.createGzip())
.pipe(response)
}
function isExistingFile(filePath) {
return new Promise((resolve, reject) => {
fs.access(filePath, (error) => {
if (error) {
resolve(false)
} else {
resolve(true)
}
})
})
}
function getAPIModule(route) {
return require(`./${route}`);
}
function isAdminPageRequest(route) {
return /^\/admin\/.*/.test(route)
}
function passCookieIntoURLSearchParams(cookieString) {
if (!cookieString) return null;
return new URLSearchParams(cookieString.replaceAll('; ', '&'))
}
function isAuthorized(cookie) {
const cookieParams = passCookieIntoURLSearchParams(cookie);
if (!cookieParams) return false;
const authToken = cookieParams.get('auth');
if (!authToken) return false;
return JWTTokenIsValid(authToken)
}
async function JWTTokenIsValid(token) {
const jwtVerify = util.promisify(jwt.verify);
const decoded = await jwtVerify(token, process.env.ADMIN_PASSWORD);
if (decoded.email) return true;
return false
}
async function handleAPIGetRequest(response, parsedUrl) {
try {
const collectionName = path.basename(parsedUrl.pathname);
const data = await database.getData(parsedUrl.searchParams, collectionName);
respondWithJSON(response, JSON.stringify(data));
} catch (error) {
console.log(error);
respondWithError(response);
}
}
function respondWithJSON(response, data) {
response.writeHead(
'200',
{ 'content-type':'application/json' }
);
response.end(data);
}
function respondWithError(response) {
response.writeHead(
'500',
{ 'content-type': 'text/plain'}
);
response.end('error');
}
process.on('uncaughtException', error => console.log(error))
exports.createLogMessage = createLogMessage;
exports.redirectHTTPRequests = redirectHTTPRequests;
exports.isAPIRequest = isAPIRequest;
exports.isFileRequest = isFileRequest;
exports.isHomePage = isHomePage;
exports.createFilePathFromPageRequest = createFilePathFromPageRequest;
exports.createFilePathFromFileRequest = createFilePathFromFileRequest;
exports.isExistingFile = isExistingFile;
exports.getAPIModule = getAPIModule;
exports.isAdminPageRequest = isAdminPageRequest;
exports.passCookieIntoURLSearchParams = passCookieIntoURLSearchParams;