From 9aa850db6f9960d1ee4a791e7df3b4ea85012bd5 Mon Sep 17 00:00:00 2001
From: JeelRajodiya <jeelrajodiyajeel@gmail.com>
Date: Sun, 20 Aug 2023 18:49:12 +0530
Subject: [PATCH 1/5] refactor: added shell for api

---
 server/app.ts            | 24 +++++++++++++-----------
 server/util/functions.ts |  8 ++++++++
 2 files changed, 21 insertions(+), 11 deletions(-)

diff --git a/server/app.ts b/server/app.ts
index 7b8c139..5260788 100644
--- a/server/app.ts
+++ b/server/app.ts
@@ -1,5 +1,4 @@
-import { loadEnvVariables } from "./util/functions";
-
+import { loadEnvVariables, updateLeaderboard } from "./util/functions";
 loadEnvVariables(__dirname);
 // keep the above imports always at the top they are used to load the environment variables
 
@@ -9,7 +8,6 @@ import WebSocket from "ws";
 import redisClient from "./util/redis";
 
 var app = express();
-
 app.use("/", async function (req: Request, res: Response, next) {
 	const count = await redisClient.incr("count");
 
@@ -17,14 +15,17 @@ app.use("/", async function (req: Request, res: Response, next) {
 });
 
 function webSocketHandler(ws: WebSocket) {
-	ws.on("message", function (message: string) {
-		console.log("received: %s", message);
-	});
-	let i = 0;
-	let interval = setInterval(() => {
-		ws.send(i);
-		i += 10;
-	}, 10000);
+	let interval = setInterval(async () => {
+		const leaderboard = await redisClient.get("leaderboard");
+		if (!leaderboard)
+			return ws.send(
+				JSON.stringify({
+					leaderboard: [],
+				})
+			);
+
+		ws.send(leaderboard);
+	}, 1000);
 
 	ws.send("something");
 	ws.on("close", function () {
@@ -32,5 +33,6 @@ function webSocketHandler(ws: WebSocket) {
 		clearInterval(interval);
 	});
 }
+setInterval(() => updateLeaderboard(redisClient as any), 10000);
 export default app;
 export { webSocketHandler };
diff --git a/server/util/functions.ts b/server/util/functions.ts
index 295d984..c528b53 100644
--- a/server/util/functions.ts
+++ b/server/util/functions.ts
@@ -1,6 +1,8 @@
 import fs from "fs";
 import dotenv from "dotenv";
 import path from "path";
+import { RedisClientType } from "redis";
+
 const requiredEnvVariables = ["REDIS_PASS", "REDIS_HOST"];
 export function loadEnvVariables(dirname: string): void {
 	try {
@@ -42,3 +44,9 @@ export function normalizePort(val: string) {
 
 	return false;
 }
+
+export async function updateLeaderboard(redisClient: RedisClientType) {
+	// fetch the json data from the codeforces api
+	const data = {}; // fetched data
+	await redisClient.set("leaderboard", JSON.stringify(data));
+}

From 75889fee6c164fb6f6e657f83eabb9b7ac781737 Mon Sep 17 00:00:00 2001
From: Saumya <saumyabshah90@gmail.com>
Date: Sun, 20 Aug 2023 21:58:36 +0530
Subject: [PATCH 2/5] fetching standings data from cf

---
 server/app.ts            |  6 +++++-
 server/package-lock.json | 12 ++++++++++++
 server/package.json      |  1 +
 server/util/functions.ts | 17 +++++++++++++++++
 4 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/server/app.ts b/server/app.ts
index 7b8c139..d105b7c 100644
--- a/server/app.ts
+++ b/server/app.ts
@@ -1,4 +1,5 @@
 import { loadEnvVariables } from "./util/functions";
+import { updateLeaderboard } from "./util/functions";
 
 loadEnvVariables(__dirname);
 // keep the above imports always at the top they are used to load the environment variables
@@ -32,5 +33,8 @@ function webSocketHandler(ws: WebSocket) {
 		clearInterval(interval);
 	});
 }
+
+setInterval(() => updateLeaderboard(redisClient as any, 468732));
+
 export default app;
-export { webSocketHandler };
+export { webSocketHandler };
\ No newline at end of file
diff --git a/server/package-lock.json b/server/package-lock.json
index 7b2678a..adeb00f 100644
--- a/server/package-lock.json
+++ b/server/package-lock.json
@@ -10,6 +10,7 @@
 			"dependencies": {
 				"@types/express": "^4.17.17",
 				"cookie-parser": "^1.4.6",
+				"crypto": "^1.0.1",
 				"dotenv": "^16.3.1",
 				"express": "^4.18.2",
 				"morgan": "^1.10.0",
@@ -512,6 +513,12 @@
 			"integrity": "sha512-dcKFX3jn0MpIaXjisoRvexIJVEKzaq7z2rZKxf+MSr9TkdmHmsU4m2lcLojrj/FHl8mk5VxMmYA+ftRkP/3oKQ==",
 			"dev": true
 		},
+		"node_modules/crypto": {
+			"version": "1.0.1",
+			"resolved": "https://registry.npmjs.org/crypto/-/crypto-1.0.1.tgz",
+			"integrity": "sha512-VxBKmeNcqQdiUQUW2Tzq0t377b54N2bMtXO/qiLa+6eRRmmC4qT3D4OnTGoT/U6O9aklQ/jTwbOtRMTTY8G0Ig==",
+			"deprecated": "This package is no longer supported. It's now a built-in Node module. If you've depended on crypto, you should switch to the one that's built-in."
+		},
 		"node_modules/debug": {
 			"version": "3.2.7",
 			"resolved": "https://registry.npmjs.org/debug/-/debug-3.2.7.tgz",
@@ -1891,6 +1898,11 @@
 			"integrity": "sha512-dcKFX3jn0MpIaXjisoRvexIJVEKzaq7z2rZKxf+MSr9TkdmHmsU4m2lcLojrj/FHl8mk5VxMmYA+ftRkP/3oKQ==",
 			"dev": true
 		},
+		"crypto": {
+			"version": "1.0.1",
+			"resolved": "https://registry.npmjs.org/crypto/-/crypto-1.0.1.tgz",
+			"integrity": "sha512-VxBKmeNcqQdiUQUW2Tzq0t377b54N2bMtXO/qiLa+6eRRmmC4qT3D4OnTGoT/U6O9aklQ/jTwbOtRMTTY8G0Ig=="
+		},
 		"debug": {
 			"version": "3.2.7",
 			"resolved": "https://registry.npmjs.org/debug/-/debug-3.2.7.tgz",
diff --git a/server/package.json b/server/package.json
index 26452a4..e6f610f 100644
--- a/server/package.json
+++ b/server/package.json
@@ -16,6 +16,7 @@
 	"dependencies": {
 		"@types/express": "^4.17.17",
 		"cookie-parser": "^1.4.6",
+		"crypto": "^1.0.1",
 		"dotenv": "^16.3.1",
 		"express": "^4.18.2",
 		"morgan": "^1.10.0",
diff --git a/server/util/functions.ts b/server/util/functions.ts
index 295d984..c42c9e2 100644
--- a/server/util/functions.ts
+++ b/server/util/functions.ts
@@ -1,6 +1,9 @@
 import fs from "fs";
 import dotenv from "dotenv";
 import path from "path";
+import { RedisClientType } from "redis";
+import crypto from 'crypto';
+
 const requiredEnvVariables = ["REDIS_PASS", "REDIS_HOST"];
 export function loadEnvVariables(dirname: string): void {
 	try {
@@ -42,3 +45,17 @@ export function normalizePort(val: string) {
 
 	return false;
 }
+
+export async function updateLeaderboard(redisClient: RedisClientType, contestId: number) {
+	const curr_time = Math.floor(new Date().getTime()/1000);
+	const apiKey = process.env.CF_API_KEY
+	const secret = process.env.CF_SECRET
+
+	const signature = crypto.createHash('sha512').update(`123456/contest.standings?apiKey=${apiKey}&contestId=${contestId}&time=${curr_time}#${secret}`).digest('hex');
+
+	const requestUrl = `https://codeforces.com/api/contest.standings?contestId=${contestId}&apiKey=${apiKey}&time=${curr_time}&apiSig=123456${signature}`;
+
+	const resp = await fetch(requestUrl);
+	const data = await resp.json();
+	await redisClient.set("leaderboard", JSON.stringify(data));
+}
\ No newline at end of file

From 3ac80884d90d36b9bc6147e20ddd38176693bd29 Mon Sep 17 00:00:00 2001
From: JeelRajodiya <jeelrajodiyajeel@gmail.com>
Date: Sun, 20 Aug 2023 23:04:14 +0530
Subject: [PATCH 3/5] fix: fetch not defined

---
 server/app.ts            |   3 +-
 server/package-lock.json | 270 ++++++++++++++++++++++++++++++---------
 server/package.json      |   4 +-
 server/server.ts         |   2 +-
 server/util/functions.ts |  34 +++--
 5 files changed, 242 insertions(+), 71 deletions(-)

diff --git a/server/app.ts b/server/app.ts
index 8da8f43..311bb72 100644
--- a/server/app.ts
+++ b/server/app.ts
@@ -35,4 +35,5 @@ function webSocketHandler(ws: WebSocket) {
 }
 setInterval(() => updateLeaderboard(redisClient as any, 468732), 10000);
 export default app;
-export { webSocketHandler};
\ No newline at end of file
+
+export { webSocketHandler };
diff --git a/server/package-lock.json b/server/package-lock.json
index 618d97d..d77872d 100644
--- a/server/package-lock.json
+++ b/server/package-lock.json
@@ -10,11 +10,13 @@
 			"dependencies": {
 				"@types/express": "^4.17.17",
 				"cookie-parser": "^1.4.6",
+				"cross-fetch": "^4.0.0",
 				"crypto": "^1.0.1",
-				"cryptos": "^1.2.4",
+				"cryptos": "^1.0.0",
 				"dotenv": "^16.3.1",
 				"express": "^4.18.2",
 				"morgan": "^1.10.0",
+				"node-fetch": "^3.3.2",
 				"nodemon": "^3.0.1",
 				"redis": "^4.6.7",
 				"typescript": "^5.1.6",
@@ -312,11 +314,6 @@
 			"resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
 			"integrity": "sha512-PCVAQswWemu6UdxsDFFX/+gVeYqKAod3D3UVm91jHwynguOwAvYPhx8nNlM++NqRcK6CxxpUafjmhIdKiHibqg=="
 		},
-		"node_modules/asn1": {
-			"version": "0.2.3",
-			"resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz",
-			"integrity": "sha512-6i37w/+EhlWlGUJff3T/Q8u1RGmP5wgbiwYnOnbOqvtrPxT63/sYFyP9RcpxtxGymtfA075IvmOnL7ycNOWl3w=="
-		},
 		"node_modules/balanced-match": {
 			"version": "1.0.2",
 			"resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
@@ -519,27 +516,50 @@
 			"integrity": "sha512-dcKFX3jn0MpIaXjisoRvexIJVEKzaq7z2rZKxf+MSr9TkdmHmsU4m2lcLojrj/FHl8mk5VxMmYA+ftRkP/3oKQ==",
 			"dev": true
 		},
+		"node_modules/cross-fetch": {
+			"version": "4.0.0",
+			"resolved": "https://registry.npmjs.org/cross-fetch/-/cross-fetch-4.0.0.tgz",
+			"integrity": "sha512-e4a5N8lVvuLgAWgnCrLr2PP0YyDOTHa9H/Rj54dirp61qXnNq46m82bRhNqIA5VccJtWBvPTFRV3TtvHUKPB1g==",
+			"dependencies": {
+				"node-fetch": "^2.6.12"
+			}
+		},
+		"node_modules/cross-fetch/node_modules/node-fetch": {
+			"version": "2.6.13",
+			"resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.13.tgz",
+			"integrity": "sha512-StxNAxh15zr77QvvkmveSQ8uCQ4+v5FkvNTj0OESmiHu+VRi/gXArXtkWMElOsOUNLtUEvI4yS+rdtOHZTwlQA==",
+			"dependencies": {
+				"whatwg-url": "^5.0.0"
+			},
+			"engines": {
+				"node": "4.x || >=6.0.0"
+			},
+			"peerDependencies": {
+				"encoding": "^0.1.0"
+			},
+			"peerDependenciesMeta": {
+				"encoding": {
+					"optional": true
+				}
+			}
+		},
 		"node_modules/crypto": {
 			"version": "1.0.1",
 			"resolved": "https://registry.npmjs.org/crypto/-/crypto-1.0.1.tgz",
 			"integrity": "sha512-VxBKmeNcqQdiUQUW2Tzq0t377b54N2bMtXO/qiLa+6eRRmmC4qT3D4OnTGoT/U6O9aklQ/jTwbOtRMTTY8G0Ig==",
 			"deprecated": "This package is no longer supported. It's now a built-in Node module. If you've depended on crypto, you should switch to the one that's built-in."
 		},
-		"node_modules/cryptojs": {
-			"version": "2.5.3",
-			"resolved": "https://registry.npmjs.org/cryptojs/-/cryptojs-2.5.3.tgz",
-			"integrity": "sha512-+rdPl1UCxE8s3R94NNn+zMKOiI4MJ7dyh3X0c5uBL3btDr4zQ6acd7f9mY7Wb5MrccZEi2Rrha3OEtLcc5XXog==",
-			"engines": {
-				"node": "*"
-			}
-		},
 		"node_modules/cryptos": {
-			"version": "1.2.4",
-			"resolved": "https://registry.npmjs.org/cryptos/-/cryptos-1.2.4.tgz",
-			"integrity": "sha512-vMbNQPQpCkZajEte1m/IB2LIZMCkI0+IpEk7S2zHssz2t3N3MjgKoUf7TkXIfyDmPiWkVazHHhShgAyNcXK9ug==",
-			"dependencies": {
-				"cryptojs": "~2.5.3",
-				"node-rsa": "^0.2.25"
+			"version": "1.0.0",
+			"resolved": "https://registry.npmjs.org/cryptos/-/cryptos-1.0.0.tgz",
+			"integrity": "sha512-f3QBXSYMhpDmy68vFp7nu6IH0Dd+okUJ9AMu9H0pDP8deUdjRWgG7bzkPbqzRo5INRdin38s8tI+cgo9AhvTCA=="
+		},
+		"node_modules/data-uri-to-buffer": {
+			"version": "4.0.1",
+			"resolved": "https://registry.npmjs.org/data-uri-to-buffer/-/data-uri-to-buffer-4.0.1.tgz",
+			"integrity": "sha512-0R9ikRb668HB7QDxT1vkpuUBtqc53YyAwMwGeUFKRojY/NWKvdZ+9UYtRfGmhqNbRkTSVpMbmyhXipFFv2cb/A==",
+			"engines": {
+				"node": ">= 12"
 			}
 		},
 		"node_modules/debug": {
@@ -667,6 +687,28 @@
 			"resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
 			"integrity": "sha512-Tpp60P6IUJDTuOq/5Z8cdskzJujfwqfOTkrwIwj7IRISpnkJnT6SyJ4PCPnGMoFjC9ddhal5KVIYtAt97ix05A=="
 		},
+		"node_modules/fetch-blob": {
+			"version": "3.2.0",
+			"resolved": "https://registry.npmjs.org/fetch-blob/-/fetch-blob-3.2.0.tgz",
+			"integrity": "sha512-7yAQpD2UMJzLi1Dqv7qFYnPbaPx7ZfFK6PiIxQ4PfkGPyNyl2Ugx+a/umUonmKqjhM4DnfbMvdX6otXq83soQQ==",
+			"funding": [
+				{
+					"type": "github",
+					"url": "https://github.com/sponsors/jimmywarting"
+				},
+				{
+					"type": "paypal",
+					"url": "https://paypal.me/jimmywarting"
+				}
+			],
+			"dependencies": {
+				"node-domexception": "^1.0.0",
+				"web-streams-polyfill": "^3.0.3"
+			},
+			"engines": {
+				"node": "^12.20 || >= 14.13"
+			}
+		},
 		"node_modules/fill-range": {
 			"version": "7.0.1",
 			"resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.0.1.tgz",
@@ -708,6 +750,17 @@
 			"resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
 			"integrity": "sha512-Tpp60P6IUJDTuOq/5Z8cdskzJujfwqfOTkrwIwj7IRISpnkJnT6SyJ4PCPnGMoFjC9ddhal5KVIYtAt97ix05A=="
 		},
+		"node_modules/formdata-polyfill": {
+			"version": "4.0.10",
+			"resolved": "https://registry.npmjs.org/formdata-polyfill/-/formdata-polyfill-4.0.10.tgz",
+			"integrity": "sha512-buewHzMvYL29jdeQTVILecSaZKnt/RJWjoZCF5OW60Z67/GmSLBkOFM7qh1PI3zFNtJbaZL5eQu1vLfazOwj4g==",
+			"dependencies": {
+				"fetch-blob": "^3.1.2"
+			},
+			"engines": {
+				"node": ">=12.20.0"
+			}
+		},
 		"node_modules/forwarded": {
 			"version": "0.2.0",
 			"resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.2.0.tgz",
@@ -898,11 +951,6 @@
 				"node": ">=0.12.0"
 			}
 		},
-		"node_modules/lodash": {
-			"version": "3.3.0",
-			"resolved": "https://registry.npmjs.org/lodash/-/lodash-3.3.0.tgz",
-			"integrity": "sha512-gpux6tVfBHsUdUIciz5HoV0ChAxUTvi0ChpQMIjAsKtg6FTYFtd1B1G0JlqHvAio3teaMVGPDPk2seVq1INwOQ=="
-		},
 		"node_modules/lru-cache": {
 			"version": "6.0.0",
 			"resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-6.0.0.tgz",
@@ -1034,13 +1082,39 @@
 				"node": ">= 0.6"
 			}
 		},
-		"node_modules/node-rsa": {
-			"version": "0.2.30",
-			"resolved": "https://registry.npmjs.org/node-rsa/-/node-rsa-0.2.30.tgz",
-			"integrity": "sha512-Tg5XrlbigFm6rek1UoIIPRHRbisJL8MhVvzx6xl/bNMaW3qRKQYJSswHsQOnoa/zTLaRG/uKht+XisA71P8U4Q==",
+		"node_modules/node-domexception": {
+			"version": "1.0.0",
+			"resolved": "https://registry.npmjs.org/node-domexception/-/node-domexception-1.0.0.tgz",
+			"integrity": "sha512-/jKZoMpw0F8GRwl4/eLROPA3cfcXtLApP0QzLmUT/HuPCZWyB7IY9ZrMeKw2O/nFIqPQB3PVM9aYm0F312AXDQ==",
+			"funding": [
+				{
+					"type": "github",
+					"url": "https://github.com/sponsors/jimmywarting"
+				},
+				{
+					"type": "github",
+					"url": "https://paypal.me/jimmywarting"
+				}
+			],
+			"engines": {
+				"node": ">=10.5.0"
+			}
+		},
+		"node_modules/node-fetch": {
+			"version": "3.3.2",
+			"resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-3.3.2.tgz",
+			"integrity": "sha512-dRB78srN/l6gqWulah9SrxeYnxeddIG30+GOqK/9OlLVyLg3HPnr6SqOWTWOXKRwC2eGYCkZ59NNuSgvSrpgOA==",
 			"dependencies": {
-				"asn1": "0.2.3",
-				"lodash": "3.3.0"
+				"data-uri-to-buffer": "^4.0.0",
+				"fetch-blob": "^3.1.4",
+				"formdata-polyfill": "^4.0.10"
+			},
+			"engines": {
+				"node": "^12.20.0 || ^14.13.1 || >=16.0.0"
+			},
+			"funding": {
+				"type": "opencollective",
+				"url": "https://opencollective.com/node-fetch"
 			}
 		},
 		"node_modules/nodemon": {
@@ -1386,6 +1460,11 @@
 				"nodetouch": "bin/nodetouch.js"
 			}
 		},
+		"node_modules/tr46": {
+			"version": "0.0.3",
+			"resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",
+			"integrity": "sha512-N3WMsuqV66lT30CrXNbEjx4GEwlow3v6rr4mCcv6prnfwhS01rkgyFdjPNBYd9br7LpXV1+Emh01fHnq2Gdgrw=="
+		},
 		"node_modules/ts-node": {
 			"version": "10.9.1",
 			"resolved": "https://registry.npmjs.org/ts-node/-/ts-node-10.9.1.tgz",
@@ -1488,6 +1567,28 @@
 				"node": ">= 0.8"
 			}
 		},
+		"node_modules/web-streams-polyfill": {
+			"version": "3.2.1",
+			"resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-3.2.1.tgz",
+			"integrity": "sha512-e0MO3wdXWKrLbL0DgGnUV7WHVuw9OUvL4hjgnPkIeEvESk74gAITi5G606JtZPp39cd8HA9VQzCIvA49LpPN5Q==",
+			"engines": {
+				"node": ">= 8"
+			}
+		},
+		"node_modules/webidl-conversions": {
+			"version": "3.0.1",
+			"resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
+			"integrity": "sha512-2JAn3z8AR6rjK8Sm8orRC0h/bcl/DqL7tRPdGZ4I1CjdF+EaMLmYxBHyXuKL849eucPFhvBoxMsflfOb8kxaeQ=="
+		},
+		"node_modules/whatwg-url": {
+			"version": "5.0.0",
+			"resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
+			"integrity": "sha512-saE57nupxk6v3HY35+jzBwYa0rKSy0XR8JSxZPwgLr7ys0IBzhGviA1/TUGJLmSVqs8pb9AnvICXEuOHLprYTw==",
+			"dependencies": {
+				"tr46": "~0.0.3",
+				"webidl-conversions": "^3.0.0"
+			}
+		},
 		"node_modules/ws": {
 			"version": "8.13.0",
 			"resolved": "https://registry.npmjs.org/ws/-/ws-8.13.0.tgz",
@@ -1775,11 +1876,6 @@
 			"resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
 			"integrity": "sha512-PCVAQswWemu6UdxsDFFX/+gVeYqKAod3D3UVm91jHwynguOwAvYPhx8nNlM++NqRcK6CxxpUafjmhIdKiHibqg=="
 		},
-		"asn1": {
-			"version": "0.2.3",
-			"resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz",
-			"integrity": "sha512-6i37w/+EhlWlGUJff3T/Q8u1RGmP5wgbiwYnOnbOqvtrPxT63/sYFyP9RcpxtxGymtfA075IvmOnL7ycNOWl3w=="
-		},
 		"balanced-match": {
 			"version": "1.0.2",
 			"resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
@@ -1940,24 +2036,38 @@
 			"integrity": "sha512-dcKFX3jn0MpIaXjisoRvexIJVEKzaq7z2rZKxf+MSr9TkdmHmsU4m2lcLojrj/FHl8mk5VxMmYA+ftRkP/3oKQ==",
 			"dev": true
 		},
+		"cross-fetch": {
+			"version": "4.0.0",
+			"resolved": "https://registry.npmjs.org/cross-fetch/-/cross-fetch-4.0.0.tgz",
+			"integrity": "sha512-e4a5N8lVvuLgAWgnCrLr2PP0YyDOTHa9H/Rj54dirp61qXnNq46m82bRhNqIA5VccJtWBvPTFRV3TtvHUKPB1g==",
+			"requires": {
+				"node-fetch": "^2.6.12"
+			},
+			"dependencies": {
+				"node-fetch": {
+					"version": "2.6.13",
+					"resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.13.tgz",
+					"integrity": "sha512-StxNAxh15zr77QvvkmveSQ8uCQ4+v5FkvNTj0OESmiHu+VRi/gXArXtkWMElOsOUNLtUEvI4yS+rdtOHZTwlQA==",
+					"requires": {
+						"whatwg-url": "^5.0.0"
+					}
+				}
+			}
+		},
 		"crypto": {
 			"version": "1.0.1",
 			"resolved": "https://registry.npmjs.org/crypto/-/crypto-1.0.1.tgz",
 			"integrity": "sha512-VxBKmeNcqQdiUQUW2Tzq0t377b54N2bMtXO/qiLa+6eRRmmC4qT3D4OnTGoT/U6O9aklQ/jTwbOtRMTTY8G0Ig=="
 		},
-		"cryptojs": {
-			"version": "2.5.3",
-			"resolved": "https://registry.npmjs.org/cryptojs/-/cryptojs-2.5.3.tgz",
-			"integrity": "sha512-+rdPl1UCxE8s3R94NNn+zMKOiI4MJ7dyh3X0c5uBL3btDr4zQ6acd7f9mY7Wb5MrccZEi2Rrha3OEtLcc5XXog=="
-		},
 		"cryptos": {
-			"version": "1.2.4",
-			"resolved": "https://registry.npmjs.org/cryptos/-/cryptos-1.2.4.tgz",
-			"integrity": "sha512-vMbNQPQpCkZajEte1m/IB2LIZMCkI0+IpEk7S2zHssz2t3N3MjgKoUf7TkXIfyDmPiWkVazHHhShgAyNcXK9ug==",
-			"requires": {
-				"cryptojs": "~2.5.3",
-				"node-rsa": "^0.2.25"
-			}
+			"version": "1.0.0",
+			"resolved": "https://registry.npmjs.org/cryptos/-/cryptos-1.0.0.tgz",
+			"integrity": "sha512-f3QBXSYMhpDmy68vFp7nu6IH0Dd+okUJ9AMu9H0pDP8deUdjRWgG7bzkPbqzRo5INRdin38s8tI+cgo9AhvTCA=="
+		},
+		"data-uri-to-buffer": {
+			"version": "4.0.1",
+			"resolved": "https://registry.npmjs.org/data-uri-to-buffer/-/data-uri-to-buffer-4.0.1.tgz",
+			"integrity": "sha512-0R9ikRb668HB7QDxT1vkpuUBtqc53YyAwMwGeUFKRojY/NWKvdZ+9UYtRfGmhqNbRkTSVpMbmyhXipFFv2cb/A=="
 		},
 		"debug": {
 			"version": "3.2.7",
@@ -2061,6 +2171,15 @@
 				}
 			}
 		},
+		"fetch-blob": {
+			"version": "3.2.0",
+			"resolved": "https://registry.npmjs.org/fetch-blob/-/fetch-blob-3.2.0.tgz",
+			"integrity": "sha512-7yAQpD2UMJzLi1Dqv7qFYnPbaPx7ZfFK6PiIxQ4PfkGPyNyl2Ugx+a/umUonmKqjhM4DnfbMvdX6otXq83soQQ==",
+			"requires": {
+				"node-domexception": "^1.0.0",
+				"web-streams-polyfill": "^3.0.3"
+			}
+		},
 		"fill-range": {
 			"version": "7.0.1",
 			"resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.0.1.tgz",
@@ -2098,6 +2217,14 @@
 				}
 			}
 		},
+		"formdata-polyfill": {
+			"version": "4.0.10",
+			"resolved": "https://registry.npmjs.org/formdata-polyfill/-/formdata-polyfill-4.0.10.tgz",
+			"integrity": "sha512-buewHzMvYL29jdeQTVILecSaZKnt/RJWjoZCF5OW60Z67/GmSLBkOFM7qh1PI3zFNtJbaZL5eQu1vLfazOwj4g==",
+			"requires": {
+				"fetch-blob": "^3.1.2"
+			}
+		},
 		"forwarded": {
 			"version": "0.2.0",
 			"resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.2.0.tgz",
@@ -2227,11 +2354,6 @@
 			"resolved": "https://registry.npmjs.org/is-number/-/is-number-7.0.0.tgz",
 			"integrity": "sha512-41Cifkg6e8TylSpdtTpeLVMqvSBEVzTttHvERD741+pnZ8ANv0004MRL43QKPDlK9cGvNp6NZWZUBlbGXYxxng=="
 		},
-		"lodash": {
-			"version": "3.3.0",
-			"resolved": "https://registry.npmjs.org/lodash/-/lodash-3.3.0.tgz",
-			"integrity": "sha512-gpux6tVfBHsUdUIciz5HoV0ChAxUTvi0ChpQMIjAsKtg6FTYFtd1B1G0JlqHvAio3teaMVGPDPk2seVq1INwOQ=="
-		},
 		"lru-cache": {
 			"version": "6.0.0",
 			"resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-6.0.0.tgz",
@@ -2332,13 +2454,19 @@
 			"resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.3.tgz",
 			"integrity": "sha512-+EUsqGPLsM+j/zdChZjsnX51g4XrHFOIXwfnCVPGlQk/k5giakcKsuxCObBRu6DSm9opw/O6slWbJdghQM4bBg=="
 		},
-		"node-rsa": {
-			"version": "0.2.30",
-			"resolved": "https://registry.npmjs.org/node-rsa/-/node-rsa-0.2.30.tgz",
-			"integrity": "sha512-Tg5XrlbigFm6rek1UoIIPRHRbisJL8MhVvzx6xl/bNMaW3qRKQYJSswHsQOnoa/zTLaRG/uKht+XisA71P8U4Q==",
+		"node-domexception": {
+			"version": "1.0.0",
+			"resolved": "https://registry.npmjs.org/node-domexception/-/node-domexception-1.0.0.tgz",
+			"integrity": "sha512-/jKZoMpw0F8GRwl4/eLROPA3cfcXtLApP0QzLmUT/HuPCZWyB7IY9ZrMeKw2O/nFIqPQB3PVM9aYm0F312AXDQ=="
+		},
+		"node-fetch": {
+			"version": "3.3.2",
+			"resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-3.3.2.tgz",
+			"integrity": "sha512-dRB78srN/l6gqWulah9SrxeYnxeddIG30+GOqK/9OlLVyLg3HPnr6SqOWTWOXKRwC2eGYCkZ59NNuSgvSrpgOA==",
 			"requires": {
-				"asn1": "0.2.3",
-				"lodash": "3.3.0"
+				"data-uri-to-buffer": "^4.0.0",
+				"fetch-blob": "^3.1.4",
+				"formdata-polyfill": "^4.0.10"
 			}
 		},
 		"nodemon": {
@@ -2586,6 +2714,11 @@
 				"nopt": "~1.0.10"
 			}
 		},
+		"tr46": {
+			"version": "0.0.3",
+			"resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",
+			"integrity": "sha512-N3WMsuqV66lT30CrXNbEjx4GEwlow3v6rr4mCcv6prnfwhS01rkgyFdjPNBYd9br7LpXV1+Emh01fHnq2Gdgrw=="
+		},
 		"ts-node": {
 			"version": "10.9.1",
 			"resolved": "https://registry.npmjs.org/ts-node/-/ts-node-10.9.1.tgz",
@@ -2647,6 +2780,25 @@
 			"resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
 			"integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg=="
 		},
+		"web-streams-polyfill": {
+			"version": "3.2.1",
+			"resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-3.2.1.tgz",
+			"integrity": "sha512-e0MO3wdXWKrLbL0DgGnUV7WHVuw9OUvL4hjgnPkIeEvESk74gAITi5G606JtZPp39cd8HA9VQzCIvA49LpPN5Q=="
+		},
+		"webidl-conversions": {
+			"version": "3.0.1",
+			"resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
+			"integrity": "sha512-2JAn3z8AR6rjK8Sm8orRC0h/bcl/DqL7tRPdGZ4I1CjdF+EaMLmYxBHyXuKL849eucPFhvBoxMsflfOb8kxaeQ=="
+		},
+		"whatwg-url": {
+			"version": "5.0.0",
+			"resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
+			"integrity": "sha512-saE57nupxk6v3HY35+jzBwYa0rKSy0XR8JSxZPwgLr7ys0IBzhGviA1/TUGJLmSVqs8pb9AnvICXEuOHLprYTw==",
+			"requires": {
+				"tr46": "~0.0.3",
+				"webidl-conversions": "^3.0.0"
+			}
+		},
 		"ws": {
 			"version": "8.13.0",
 			"resolved": "https://registry.npmjs.org/ws/-/ws-8.13.0.tgz",
diff --git a/server/package.json b/server/package.json
index 0c2b6d5..e29afb4 100644
--- a/server/package.json
+++ b/server/package.json
@@ -16,11 +16,13 @@
 	"dependencies": {
 		"@types/express": "^4.17.17",
 		"cookie-parser": "^1.4.6",
+		"cross-fetch": "^4.0.0",
 		"crypto": "^1.0.1",
-		"cryptos": "^1.2.4",
+		"cryptos": "^1.0.0",
 		"dotenv": "^16.3.1",
 		"express": "^4.18.2",
 		"morgan": "^1.10.0",
+		"node-fetch": "^3.3.2",
 		"nodemon": "^3.0.1",
 		"redis": "^4.6.7",
 		"typescript": "^5.1.6",
diff --git a/server/server.ts b/server/server.ts
index d2c2a57..da237fa 100644
--- a/server/server.ts
+++ b/server/server.ts
@@ -30,7 +30,7 @@ app.use(function (
 	res.render("error");
 });
 
-var port = normalizePort(process.env.PORT || "3000");
+var port = normalizePort(process.env.PORT || "3001");
 app.set("port", port);
 
 /**
diff --git a/server/util/functions.ts b/server/util/functions.ts
index c42c9e2..6f8729b 100644
--- a/server/util/functions.ts
+++ b/server/util/functions.ts
@@ -2,9 +2,14 @@ import fs from "fs";
 import dotenv from "dotenv";
 import path from "path";
 import { RedisClientType } from "redis";
-import crypto from 'crypto';
-
-const requiredEnvVariables = ["REDIS_PASS", "REDIS_HOST"];
+import crypto from "crypto";
+import fetch from "cross-fetch";
+const requiredEnvVariables = [
+	"REDIS_PASS",
+	"REDIS_HOST",
+	"CF_SECRET",
+	"CF_API_KEY",
+];
 export function loadEnvVariables(dirname: string): void {
 	try {
 		const envFilePath = path.resolve(dirname, ".env");
@@ -46,16 +51,27 @@ export function normalizePort(val: string) {
 	return false;
 }
 
-export async function updateLeaderboard(redisClient: RedisClientType, contestId: number) {
-	const curr_time = Math.floor(new Date().getTime()/1000);
-	const apiKey = process.env.CF_API_KEY
-	const secret = process.env.CF_SECRET
+export async function updateLeaderboard(
+	redisClient: RedisClientType,
+	contestId: number
+) {
+	const curr_time = Math.floor(new Date().getTime() / 1000);
+	const apiKey = process.env.CF_API_KEY;
+	const secret = process.env.CF_SECRET;
+	if (!apiKey || !secret) {
+		throw new Error("API key or secret is missing");
+	}
 
-	const signature = crypto.createHash('sha512').update(`123456/contest.standings?apiKey=${apiKey}&contestId=${contestId}&time=${curr_time}#${secret}`).digest('hex');
+	const signature = crypto
+		.createHash("sha512")
+		.update(
+			`123456/contest.standings?apiKey=${apiKey}&contestId=${contestId}&time=${curr_time}#${secret}`
+		)
+		.digest("hex");
 
 	const requestUrl = `https://codeforces.com/api/contest.standings?contestId=${contestId}&apiKey=${apiKey}&time=${curr_time}&apiSig=123456${signature}`;
 
 	const resp = await fetch(requestUrl);
 	const data = await resp.json();
 	await redisClient.set("leaderboard", JSON.stringify(data));
-}
\ No newline at end of file
+}

From 2f584275dbabf78269a7b5a4c1e3e699ee1099b0 Mon Sep 17 00:00:00 2001
From: JeelRajodiya <jeelrajodiyajeel@gmail.com>
Date: Sun, 20 Aug 2023 23:33:48 +0530
Subject: [PATCH 4/5] feat: web socket works perfectly

---
 client/app/Test/page.tsx | 19 +++++++++++++++++++
 server/app.ts            |  3 ++-
 2 files changed, 21 insertions(+), 1 deletion(-)
 create mode 100644 client/app/Test/page.tsx

diff --git a/client/app/Test/page.tsx b/client/app/Test/page.tsx
new file mode 100644
index 0000000..fb0091b
--- /dev/null
+++ b/client/app/Test/page.tsx
@@ -0,0 +1,19 @@
+"use client";
+import { useEffect, useState } from "react";
+
+export default function Test() {
+	const ws = new WebSocket("ws://localhost:3001");
+	const [data, setData] = useState(null);
+	useEffect(() => {
+		ws.onmessage = (e) => {
+			// a message was received
+
+			setData(e.data);
+		};
+		return () => {
+			ws.close();
+		};
+	}, []);
+
+	return <div>{data}</div>;
+}
diff --git a/server/app.ts b/server/app.ts
index 311bb72..d1be599 100644
--- a/server/app.ts
+++ b/server/app.ts
@@ -33,7 +33,8 @@ function webSocketHandler(ws: WebSocket) {
 		clearInterval(interval);
 	});
 }
-setInterval(() => updateLeaderboard(redisClient as any, 468732), 10000);
+
+setInterval(() => updateLeaderboard(redisClient as any, 468732), 1000);
 export default app;
 
 export { webSocketHandler };

From 50164ca4af1ecb456ce63c6f98f73d23d9a69448 Mon Sep 17 00:00:00 2001
From: JeelRajodiya <jeelrajodiyajeel@gmail.com>
Date: Sun, 20 Aug 2023 23:36:45 +0530
Subject: [PATCH 5/5] refactor: dependencies

---
 server/app.ts            |   2 +-
 server/package-lock.json | 127 ---------------------------------------
 server/package.json      |   1 -
 3 files changed, 1 insertion(+), 129 deletions(-)

diff --git a/server/app.ts b/server/app.ts
index d1be599..b670265 100644
--- a/server/app.ts
+++ b/server/app.ts
@@ -34,7 +34,7 @@ function webSocketHandler(ws: WebSocket) {
 	});
 }
 
-setInterval(() => updateLeaderboard(redisClient as any, 468732), 1000);
+setInterval(() => updateLeaderboard(redisClient as any, 468732), 4000);
 export default app;
 
 export { webSocketHandler };
diff --git a/server/package-lock.json b/server/package-lock.json
index d77872d..1fa6c1d 100644
--- a/server/package-lock.json
+++ b/server/package-lock.json
@@ -16,7 +16,6 @@
 				"dotenv": "^16.3.1",
 				"express": "^4.18.2",
 				"morgan": "^1.10.0",
-				"node-fetch": "^3.3.2",
 				"nodemon": "^3.0.1",
 				"redis": "^4.6.7",
 				"typescript": "^5.1.6",
@@ -554,14 +553,6 @@
 			"resolved": "https://registry.npmjs.org/cryptos/-/cryptos-1.0.0.tgz",
 			"integrity": "sha512-f3QBXSYMhpDmy68vFp7nu6IH0Dd+okUJ9AMu9H0pDP8deUdjRWgG7bzkPbqzRo5INRdin38s8tI+cgo9AhvTCA=="
 		},
-		"node_modules/data-uri-to-buffer": {
-			"version": "4.0.1",
-			"resolved": "https://registry.npmjs.org/data-uri-to-buffer/-/data-uri-to-buffer-4.0.1.tgz",
-			"integrity": "sha512-0R9ikRb668HB7QDxT1vkpuUBtqc53YyAwMwGeUFKRojY/NWKvdZ+9UYtRfGmhqNbRkTSVpMbmyhXipFFv2cb/A==",
-			"engines": {
-				"node": ">= 12"
-			}
-		},
 		"node_modules/debug": {
 			"version": "3.2.7",
 			"resolved": "https://registry.npmjs.org/debug/-/debug-3.2.7.tgz",
@@ -687,28 +678,6 @@
 			"resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
 			"integrity": "sha512-Tpp60P6IUJDTuOq/5Z8cdskzJujfwqfOTkrwIwj7IRISpnkJnT6SyJ4PCPnGMoFjC9ddhal5KVIYtAt97ix05A=="
 		},
-		"node_modules/fetch-blob": {
-			"version": "3.2.0",
-			"resolved": "https://registry.npmjs.org/fetch-blob/-/fetch-blob-3.2.0.tgz",
-			"integrity": "sha512-7yAQpD2UMJzLi1Dqv7qFYnPbaPx7ZfFK6PiIxQ4PfkGPyNyl2Ugx+a/umUonmKqjhM4DnfbMvdX6otXq83soQQ==",
-			"funding": [
-				{
-					"type": "github",
-					"url": "https://github.com/sponsors/jimmywarting"
-				},
-				{
-					"type": "paypal",
-					"url": "https://paypal.me/jimmywarting"
-				}
-			],
-			"dependencies": {
-				"node-domexception": "^1.0.0",
-				"web-streams-polyfill": "^3.0.3"
-			},
-			"engines": {
-				"node": "^12.20 || >= 14.13"
-			}
-		},
 		"node_modules/fill-range": {
 			"version": "7.0.1",
 			"resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.0.1.tgz",
@@ -750,17 +719,6 @@
 			"resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
 			"integrity": "sha512-Tpp60P6IUJDTuOq/5Z8cdskzJujfwqfOTkrwIwj7IRISpnkJnT6SyJ4PCPnGMoFjC9ddhal5KVIYtAt97ix05A=="
 		},
-		"node_modules/formdata-polyfill": {
-			"version": "4.0.10",
-			"resolved": "https://registry.npmjs.org/formdata-polyfill/-/formdata-polyfill-4.0.10.tgz",
-			"integrity": "sha512-buewHzMvYL29jdeQTVILecSaZKnt/RJWjoZCF5OW60Z67/GmSLBkOFM7qh1PI3zFNtJbaZL5eQu1vLfazOwj4g==",
-			"dependencies": {
-				"fetch-blob": "^3.1.2"
-			},
-			"engines": {
-				"node": ">=12.20.0"
-			}
-		},
 		"node_modules/forwarded": {
 			"version": "0.2.0",
 			"resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.2.0.tgz",
@@ -1082,41 +1040,6 @@
 				"node": ">= 0.6"
 			}
 		},
-		"node_modules/node-domexception": {
-			"version": "1.0.0",
-			"resolved": "https://registry.npmjs.org/node-domexception/-/node-domexception-1.0.0.tgz",
-			"integrity": "sha512-/jKZoMpw0F8GRwl4/eLROPA3cfcXtLApP0QzLmUT/HuPCZWyB7IY9ZrMeKw2O/nFIqPQB3PVM9aYm0F312AXDQ==",
-			"funding": [
-				{
-					"type": "github",
-					"url": "https://github.com/sponsors/jimmywarting"
-				},
-				{
-					"type": "github",
-					"url": "https://paypal.me/jimmywarting"
-				}
-			],
-			"engines": {
-				"node": ">=10.5.0"
-			}
-		},
-		"node_modules/node-fetch": {
-			"version": "3.3.2",
-			"resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-3.3.2.tgz",
-			"integrity": "sha512-dRB78srN/l6gqWulah9SrxeYnxeddIG30+GOqK/9OlLVyLg3HPnr6SqOWTWOXKRwC2eGYCkZ59NNuSgvSrpgOA==",
-			"dependencies": {
-				"data-uri-to-buffer": "^4.0.0",
-				"fetch-blob": "^3.1.4",
-				"formdata-polyfill": "^4.0.10"
-			},
-			"engines": {
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-				"url": "https://opencollective.com/node-fetch"
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 			"resolved": "https://registry.npmjs.org/nodemon/-/nodemon-3.0.1.tgz",
@@ -1567,14 +1490,6 @@
 				"node": ">= 0.8"
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-			"engines": {
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 			"resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
@@ -2064,11 +1979,6 @@
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-			"resolved": "https://registry.npmjs.org/data-uri-to-buffer/-/data-uri-to-buffer-4.0.1.tgz",
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@@ -2171,15 +2081,6 @@
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-			"resolved": "https://registry.npmjs.org/fetch-blob/-/fetch-blob-3.2.0.tgz",
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-		},
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@@ -2217,14 +2118,6 @@
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 			"resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.2.0.tgz",
@@ -2454,21 +2347,6 @@
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-		"node-domexception": {
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-			"resolved": "https://registry.npmjs.org/node-domexception/-/node-domexception-1.0.0.tgz",
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-		},
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-			"integrity": "sha512-dRB78srN/l6gqWulah9SrxeYnxeddIG30+GOqK/9OlLVyLg3HPnr6SqOWTWOXKRwC2eGYCkZ59NNuSgvSrpgOA==",
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 		"nodemon": {
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 			"resolved": "https://registry.npmjs.org/nodemon/-/nodemon-3.0.1.tgz",
@@ -2780,11 +2658,6 @@
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-			"resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-3.2.1.tgz",
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-		},
 		"webidl-conversions": {
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 			"resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
diff --git a/server/package.json b/server/package.json
index e29afb4..8147ccd 100644
--- a/server/package.json
+++ b/server/package.json
@@ -22,7 +22,6 @@
 		"dotenv": "^16.3.1",
 		"express": "^4.18.2",
 		"morgan": "^1.10.0",
-		"node-fetch": "^3.3.2",
 		"nodemon": "^3.0.1",
 		"redis": "^4.6.7",
 		"typescript": "^5.1.6",