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const PORT = Number(process.env['PORT'] || 3000);

const MAX_ITEMS = 500; // Maximum number of items allowed

const MAX_SIZE = '1mb'; // Each item's maximum size

const MAX_AGE_MS = 4 * 60 * 60 * 1000; // Maximum age of 4 hours in milliseconds

const REAPER_MS = 60 * 1000; // Run the reaper every minute

const Koa = require('koa');

const Router = require('@koa/router');

const bodyParser = require('koa-bodyparser');

const app = new Koa();

const router = new Router();

const store = {};

const contentTypes = {};

const timestamps = {};

const pathOrder = [];

// Middleware to enforce body size limit of 1mb

app.use(bodyParser({

enableTypes: ['json', 'form', 'text'],

jsonLimit: MAX_SIZE,

textLimit: MAX_SIZE,

formLimit: MAX_SIZE

}));

// Function to enforce maximum items in the store

function enforceMaxItems() {

while (pathOrder.length > MAX_ITEMS) {

const oldestPath = pathOrder.shift();

delete store[oldestPath];

delete contentTypes[oldestPath];

}

}

// Function to remove old entries

function reaper() {

const now = Date.now();

for (const path of Object.keys(store)) {

if (now - timestamps[path] > MAX_AGE_MS) {

delete store[path];

delete contentTypes[path];

delete timestamps[path];

const index = pathOrder.indexOf(path);

if (index !== -1) pathOrder.splice(index, 1);

}

}

}

// POST endpoint to set a value at a dynamic path

router.post('/:path', (ctx) => {

const { path } = ctx.params;

const value = ctx.request.body;

if (!value) {

ctx.status = 400;

ctx.body = { error: 'Value is required' };

return;

}

if (!store[path]) {

pathOrder.push(path);

}

store[path] = value;

contentTypes[path] = ctx.request.type;

enforceMaxItems();

ctx.status = 201;

ctx.body = {};

});

// GET endpoint to serve as a health check

router.get('/', (ctx) => {

ctx.status = 200;

ctx.body = 'Path not specified!';

});

// GET endpoint to retrieve a value from a dynamic path

router.get('/:path', (ctx) => {

const { path } = ctx.params;

if (store[path] === undefined) {

ctx.status = 404;

ctx.body = 'Value not found!';

return;

}

ctx.type = contentTypes[path] || 'text/plain';

ctx.body = store[path];

});

setInterval(reaper, REAPER_MS);

app.use(router.routes()).use(router.allowedMethods());

app.listen(PORT, () => {

console.log(`Server running on http://localhost:${PORT}`);

});