Basic implementation of Codeforces contest reminders

Signed-off-by: adithyagenie <adithyagenie@gmail.com>

package.json

@@ -17,7 +17,8 @@
     "node-schedule": "^2.1.1",
     "@grammyjs/parse-mode": "^1.10.0",
     "fastify": "^4.27.0",
-    "leetcode-query": "^1.2.3"
+    "leetcode-query": "^1.2.3",
+    "codeforces-api-ts":  "^3.0.1"
   },
   "devDependencies": {
     "@grammyjs/types": "^3.8.0",

pnpm-lock.yaml

@@ -8,6 +8,9 @@ dependencies:
   '@grammyjs/parse-mode':
     specifier: ^1.10.0
     version: 1.10.0(grammy@1.24.1)
+  codeforces-api-ts:
+    specifier: ^3.0.1
+    version: 3.0.1
   dotenv:
     specifier: ^16.4.5
     version: 16.4.5
@@ -493,6 +496,17 @@ packages:
       ieee754: 1.2.1
     dev: false
 
+  /call-bind@1.0.7:
+    resolution: {integrity: sha512-GHTSNSYICQ7scH7sZ+M2rFopRoLh8t2bLSW6BbgrtLsahOIB5iyAVJf9GjWK3cYTDaMj4XdBpM1cA6pIS0Kv2w==}
+    engines: {node: '>= 0.4'}
+    dependencies:
+      es-define-property: 1.0.0
+      es-errors: 1.3.0
+      function-bind: 1.1.2
+      get-intrinsic: 1.2.4
+      set-function-length: 1.2.2
+    dev: false
+
   /callsites@3.1.0:
     resolution: {integrity: sha512-P8BjAsXvZS+VIDUI11hHCQEv74YT67YUi5JJFNWIqL235sBmjX4+qx9Muvls5ivyNENctx46xQLQ3aTuE7ssaQ==}
     engines: {node: '>=6'}
@@ -506,6 +520,13 @@ packages:
       supports-color: 7.2.0
     dev: true
 
+  /codeforces-api-ts@3.0.1:
+    resolution: {integrity: sha512-VkHDKFD8EA94OqJD9GGehJeNP5GtACNrhEzZBejroTl6k8GlTH/X/s7yQUnzkqfek8gWe2dvuhvvE07DkZ25CQ==}
+    dependencies:
+      lodash: 4.17.21
+      qs: 6.12.1
+    dev: false
+
   /color-convert@2.0.1:
     resolution: {integrity: sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==}
     engines: {node: '>=7.0.0'}
@@ -572,6 +593,15 @@ packages:
     resolution: {integrity: sha512-oIPzksmTg4/MriiaYGO+okXDT7ztn/w3Eptv/+gSIdMdKsJo0u4CfYNFJPy+4SKMuCqGw2wxnA+URMg3t8a/bQ==}
     dev: true
 
+  /define-data-property@1.1.4:
+    resolution: {integrity: sha512-rBMvIzlpA8v6E+SJZoo++HAYqsLrkg7MSfIinMPFhmkorw7X+dOXVJQs+QT69zGkzMyfDnIMN2Wid1+NbL3T+A==}
+    engines: {node: '>= 0.4'}
+    dependencies:
+      es-define-property: 1.0.0
+      es-errors: 1.3.0
+      gopd: 1.0.1
+    dev: false
+
   /delayed-stream@1.0.0:
     resolution: {integrity: sha512-ZySD7Nf91aLB0RxL4KGrKHBXl7Eds1DAmEdcoVawXnLD7SDhpNgtuII2aAkg7a7QS41jxPSZ17p4VdGnMHk3MQ==}
     engines: {node: '>=0.4.0'}
@@ -589,6 +619,18 @@ packages:
     engines: {node: '>=12'}
     dev: false
 
+  /es-define-property@1.0.0:
+    resolution: {integrity: sha512-jxayLKShrEqqzJ0eumQbVhTYQM27CfT1T35+gCgDFoL82JLsXqTJ76zv6A0YLOgEnLUMvLzsDsGIrl8NFpT2gQ==}
+    engines: {node: '>= 0.4'}
+    dependencies:
+      get-intrinsic: 1.2.4
+    dev: false
+
+  /es-errors@1.3.0:
+    resolution: {integrity: sha512-Zf5H2Kxt2xjTvbJvP2ZWLEICxA6j+hAmMzIlypy4xcBg1vKVnx89Wy0GbS+kf5cwCVFFzdCFh2XSCFNULS6csw==}
+    engines: {node: '>= 0.4'}
+    dev: false
+
   /escape-string-regexp@4.0.0:
     resolution: {integrity: sha512-TtpcNJ3XAzx3Gq8sWRzJaVajRs0uVxA2YAkdb1jm2YkPz4G6egUFAyA3n5vtEIZefPk5Wa4UXbKuS5fKkJWdgA==}
     engines: {node: '>=10'}
@@ -842,6 +884,21 @@ packages:
     engines: {node: '>= 0.6'}
     dev: false
 
+  /function-bind@1.1.2:
+    resolution: {integrity: sha512-7XHNxH7qX9xG5mIwxkhumTox/MIRNcOgDrxWsMt2pAr23WHp6MrRlN7FBSFpCpr+oVO0F744iUgR82nJMfG2SA==}
+    dev: false
+
+  /get-intrinsic@1.2.4:
+    resolution: {integrity: sha512-5uYhsJH8VJBTv7oslg4BznJYhDoRI6waYCxMmCdnTrcCrHA/fCFKoTFz2JKKE0HdDFUF7/oQuhzumXJK7paBRQ==}
+    engines: {node: '>= 0.4'}
+    dependencies:
+      es-errors: 1.3.0
+      function-bind: 1.1.2
+      has-proto: 1.0.3
+      has-symbols: 1.0.3
+      hasown: 2.0.2
+    dev: false
+
   /glob-parent@5.1.2:
     resolution: {integrity: sha512-AOIgSQCepiJYwP3ARnGx+5VnTu2HBYdzbGP45eLw1vr3zB3vZLeyed1sC9hnbcOc9/SrMyM5RPQrkGz4aS9Zow==}
     engines: {node: '>= 6'}
@@ -873,6 +930,12 @@ packages:
       slash: 3.0.0
     dev: true
 
+  /gopd@1.0.1:
+    resolution: {integrity: sha512-d65bNlIadxvpb/A2abVdlqKqV563juRnZ1Wtk6s1sIR8uNsXR70xqIzVqxVf1eTqDunwT2MkczEeaezCKTZhwA==}
+    dependencies:
+      get-intrinsic: 1.2.4
+    dev: false
+
   /grammy@1.24.1:
     resolution: {integrity: sha512-0ijKmqL1wlxIk+Zml4qZDXTbacWFf9IEmTPAjvNpl5jpaarkE7SOxst1gDb0ZmySAPimzvP2vH4rc0IhwexSOA==}
     engines: {node: ^12.20.0 || >=14.13.1}
@@ -895,6 +958,29 @@ packages:
     engines: {node: '>=8'}
     dev: true
 
+  /has-property-descriptors@1.0.2:
+    resolution: {integrity: sha512-55JNKuIW+vq4Ke1BjOTjM2YctQIvCT7GFzHwmfZPGo5wnrgkid0YQtnAleFSqumZm4az3n2BS+erby5ipJdgrg==}
+    dependencies:
+      es-define-property: 1.0.0
+    dev: false
+
+  /has-proto@1.0.3:
+    resolution: {integrity: sha512-SJ1amZAJUiZS+PhsVLf5tGydlaVB8EdFpaSO4gmiUKUOxk8qzn5AIy4ZeJUmh22znIdk/uMAUT2pl3FxzVUH+Q==}
+    engines: {node: '>= 0.4'}
+    dev: false
+
+  /has-symbols@1.0.3:
+    resolution: {integrity: sha512-l3LCuF6MgDNwTDKkdYGEihYjt5pRPbEg46rtlmnSPlUbgmB8LOIrKJbYYFBSbnPaJexMKtiPO8hmeRjRz2Td+A==}
+    engines: {node: '>= 0.4'}
+    dev: false
+
+  /hasown@2.0.2:
+    resolution: {integrity: sha512-0hJU9SCPvmMzIBdZFqNPXWa6dqh7WdH0cII9y+CyS8rG3nL48Bclra9HmKhVVUHyPWNH5Y7xDwAB7bfgSjkUMQ==}
+    engines: {node: '>= 0.4'}
+    dependencies:
+      function-bind: 1.1.2
+    dev: false
+
   /ieee754@1.2.1:
     resolution: {integrity: sha512-dcyqhDvX1C46lXZcVqCpK+FtMRQVdIMN6/Df5js2zouUsqG7I6sFxitIC+7KYK29KdXOLHdu9zL4sFnoVQnqaA==}
     dev: false
@@ -1021,6 +1107,10 @@ packages:
     resolution: {integrity: sha512-0KpjqXRVvrYyCsX1swR/XTK0va6VQkQM6MNo7PqW77ByjAhoARA8EfrP1N4+KlKj8YS0ZUCtRT/YUuhyYDujIQ==}
     dev: true
 
+  /lodash@4.17.21:
+    resolution: {integrity: sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==}
+    dev: false
+
   /long-timeout@0.1.1:
     resolution: {integrity: sha512-BFRuQUqc7x2NWxfJBCyUrN8iYUYznzL9JROmRz1gZ6KlOIgmoD+njPVbb+VNn2nGMKggMsK79iUNErillsrx7w==}
     dev: false
@@ -1096,6 +1186,10 @@ packages:
       sorted-array-functions: 1.3.0
     dev: false
 
+  /object-inspect@1.13.1:
+    resolution: {integrity: sha512-5qoj1RUiKOMsCCNLV1CBiPYE10sziTsnmNxkAI/rZhiD63CF7IqdFGC/XzjWjpSgLf0LxXX3bDFIh0E18f6UhQ==}
+    dev: false
+
   /on-exit-leak-free@2.1.2:
     resolution: {integrity: sha512-0eJJY6hXLGf1udHwfNftBqH+g73EU4B504nZeKpz1sYRKafAghwxEJunB2O7rDZkL4PGfsMVnTXZ2EjibbqcsA==}
     engines: {node: '>=14.0.0'}
@@ -1208,6 +1302,13 @@ packages:
     resolution: {integrity: sha512-vYt7UD1U9Wg6138shLtLOvdAu+8DsC/ilFtEVHcH+wydcSpNE20AfSOduf6MkRFahL5FY7X1oU7nKVZFtfq8Fg==}
     engines: {node: '>=6'}
 
+  /qs@6.12.1:
+    resolution: {integrity: sha512-zWmv4RSuB9r2mYQw3zxQuHWeU+42aKi1wWig/j4ele4ygELZ7PEO6MM7rim9oAQH2A5MWfsAVf/jPvTPgCbvUQ==}
+    engines: {node: '>=0.6'}
+    dependencies:
+      side-channel: 1.0.6
+    dev: false
+
   /queue-microtask@1.2.3:
     resolution: {integrity: sha512-NuaNSa6flKT5JaSYQzJok04JzTL1CA6aGhv5rfLW3PgqA+M2ChpZQnAC8h8i4ZFkBS8X5RqkDBHA7r4hej3K9A==}
     dev: true
@@ -1289,6 +1390,18 @@ packages:
     resolution: {integrity: sha512-RVnVQxTXuerk653XfuliOxBP81Sf0+qfQE73LIYKcyMYHG94AuH0kgrQpRDuTZnSmjpysHmzxJXKNfa6PjFhyQ==}
     dev: false
 
+  /set-function-length@1.2.2:
+    resolution: {integrity: sha512-pgRc4hJ4/sNjWCSS9AmnS40x3bNMDTknHgL5UaMBTMyJnU90EgWh1Rz+MC9eFu4BuN/UwZjKQuY/1v3rM7HMfg==}
+    engines: {node: '>= 0.4'}
+    dependencies:
+      define-data-property: 1.1.4
+      es-errors: 1.3.0
+      function-bind: 1.1.2
+      get-intrinsic: 1.2.4
+      gopd: 1.0.1
+      has-property-descriptors: 1.0.2
+    dev: false
+
   /shebang-command@2.0.0:
     resolution: {integrity: sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA==}
     engines: {node: '>=8'}
@@ -1301,6 +1414,16 @@ packages:
     engines: {node: '>=8'}
     dev: true
 
+  /side-channel@1.0.6:
+    resolution: {integrity: sha512-fDW/EZ6Q9RiO8eFG8Hj+7u/oW+XrPTIChwCOM2+th2A6OblDtYYIpve9m+KvI9Z4C9qSEXlaGR6bTEYHReuglA==}
+    engines: {node: '>= 0.4'}
+    dependencies:
+      call-bind: 1.0.7
+      es-errors: 1.3.0
+      get-intrinsic: 1.2.4
+      object-inspect: 1.13.1
+    dev: false
+
   /slash@3.0.0:
     resolution: {integrity: sha512-g9Q1haeby36OSStwb4ntCGGGaKsaVSjQ68fBxoQcutl5fS1vuY18H3wSt3jFyFtrkx+Kz0V1G85A4MyAdDMi2Q==}
     engines: {node: '>=8'}

src/api/cfFetch.ts

@@ -0,0 +1,17 @@
+import { CodeforcesAPI } from "codeforces-api-ts";
+
+export async function cfFetchContests(): Promise<{ name: string; startTime: number; id: number }[]> {
+	const res = await CodeforcesAPI.call("contest.list", {});
+	if (res.status == "OK") {
+		let futureContests = res.result.filter(o => o.phase == "BEFORE");
+		futureContests.filter(o => o.name.includes("Codeforces") && o.name.includes("Div. ") && o.startTimeSeconds !== undefined);
+		return futureContests.map((o) => ({
+			name: o.name,
+			id: o.id,
+			startTime: o.startTimeSeconds as number
+		}));
+	}
+	else {
+		throw new Error("Unable to reach Codeforces API :(");
+	}
+}

src/bot/commands/contestRem.ts

@@ -1,4 +1,5 @@
 import { bot } from "../bot";
+import { CodeforcesAPI } from "codeforces-api-ts";
 
 export async function reminderContestLC(contestName: string, contestKey: string): Promise<void> {
 	await bot.api.sendMessage(parseInt(process.env.CHAT_ID as string),
@@ -11,3 +12,13 @@ export async function reminderContestCodeChef(): Promise<void> {
 		`CodeChef contest is in ~10 minutes.\n
 Attend the contest here: https://www.codechef.com/contests/`);
 }
+
+export async function reminderContestCF(contestName: string, contestID: number, contestTime: Date) {
+	let options: {timeZone: string, timeStyle: "short"} = {
+			timeZone: 'Asia/Calcutta',
+			timeStyle: "short"
+		};
+	await bot.api.sendMessage(parseInt(process.env.CHAT_ID as string),
+		`${contestName} at ${new Date(contestTime).toLocaleTimeString('en-US', options)} IST starts in ~10 minutes.
+Attend the contest here: https://codeforces.com/contests/${contestID}`);
+}

src/helpers/cfSchedule.ts

@@ -0,0 +1,18 @@
+import { cfFetchContests } from "../api/cfFetch";
+import { scheduleJob } from "node-schedule";
+import { reminderContestCF } from "../bot/commands/contestRem";
+
+
+export async function cfSchedule() {
+	const contests = await cfFetchContests();
+	if (contests.length === 0) {
+		console.log("No codeforces contests found!");
+		return;
+	}
+	for (let contest of contests) {
+		const contestRemTime = new Date((contest.startTime - 600) * 1000);
+		const contestTime = new Date(contest.startTime * 1000);
+		scheduleJob(`${contest.name}`, contestRemTime, reminderContestCF.bind(null, contest.name, contest.id, contestTime));
+	}
+	console.log("Codeforces contests scheduled!");
+}

src/helpers/lcSchedule.ts

@@ -20,7 +20,6 @@ function getNextBiweeklyDate(): Date {
 
 
 export async function lcSchedule() {
-	await gracefulShutdown();
 	const contestNames = await fetchLCContests();
 	const biweekly = contestNames.filter(o =>
 		o.key.match(/^biweekly-contest-(\d+)$/)

src/helpers/scheduler.ts

@@ -1,7 +1,11 @@
 import { lcSchedule } from "./lcSchedule";
 import { ccSchedule } from "./ccSchedule";
+import { cfSchedule } from "./cfSchedule";
+import { gracefulShutdown } from "node-schedule";
 
 export async function contestScheduler() {
+	await gracefulShutdown();
 	await lcSchedule();
 	ccSchedule();
+	await cfSchedule();
 }