Automated holiday generator

.github/workflows/holiday-generator.yml

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+name: Generate holiday ICS files
+
+on:
+    schedule:
+        # Run every year on 1st December, midnight
+        - cron: '0 0 1 12 *'
+    workflow_dispatch:
+
+jobs:
+    generate:
+        name: Generate ICS
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+            - name: Install NodeJS
+              uses: actions/setup-node@v4
+              with:
+                node-version: 20
+            - name: Run script
+              env:
+                LOG_ENABLED: true
+              working-directory: ./.github/workflows/holiday-generator
+              run: 'npm install && npm start'
+            - name: Create PR
+              uses: peter-evans/create-pull-request@v6
+              with:
+                commit-message: 'Autogenerated holidays update'
+                title: 'Holidays update'
+                body: ' '
+              env:
+                GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/holiday-generator/.gitignore

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+/node_modules
+package-lock.json

.github/workflows/holiday-generator/config.js

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+import { cwd } from "node:process";
+import { join } from "node:path";
+
+export const SHOULD_LOG = process.env.LOG_ENABLED === "true";
+
+export const ICS_PATH = join(cwd(), "../../../app/src/main/assets");
+
+// country codes from https://github.com/commenthol/date-holidays?tab=readme-ov-file#supported-countries-states-regions
+export const COUNTRIES = [
+    ["algeria.ics", "DZ"],
+    ["argentina.ics", "AR"],
+    ["australia.ics", "AU"],
+    ["austria.ics", "AT"],
+    ["belgium.ics", "BE"],
+    ["bolivia.ics", "BO"],
+    ["brazil.ics", "BR"],
+    ["bulgaria.ics", "BG"],
+    ["canada.ics", "CA"],
+    ["china.ics", "CN"],
+    ["colombia.ics", "CO"],
+    ["costarica.ics", "CR"],
+    ["croatia.ics", "HR"],
+    ["czech.ics", "CZ"],
+    ["denmark.ics", "DK"],
+    ["estonia.ics", "EE"],
+    ["finland.ics", "FI"],
+    ["france.ics", "FR"],
+    ["germany.ics", "DE"],
+    ["greece.ics", "GR"],
+    ["haiti.ics", "HT"],
+    ["hungary.ics", "HU"],
+    ["iceland.ics", "IS"],
+    // TODO add India: https://github.com/commenthol/date-holidays/issues/137
+    // ["india.ics", ""],
+    ["indonesia.ics", "ID"],
+    ["ireland.ics", "IE"],
+    ["israel.ics", "IL"],
+    ["italy.ics", "IT"],
+    ["japan.ics", "jp"],
+    // TODO add Kazakhstan: (no GH issue)
+    // ["kazakhstan.ics", ""],
+    ["latvia.ics", "LV"],
+    ["liechtenstein.ics", "LI"],
+    ["lithuania.ics", "LT"],
+    ["luxembourg.ics", "LU"],
+    ["macedonia.ics", "MK"],
+    ["malaysia.ics", "MY"],
+    ["mexico.ics", "MX"],
+    ["morocco.ics", "MA"],
+    ["netherlands.ics", "NL"],
+    ["nicaragua.ics", "NI"],
+    ["nigeria.ics", "NG"],
+    ["norway.ics", "NO"],
+    // TODO add Pakistan: https://github.com/commenthol/date-holidays/pull/138
+    // ["pakistan.ics", ""],
+    ["poland.ics", "PL"],
+    ["portugal.ics", "PT"],
+    ["romania.ics", "RO"],
+    ["russia.ics", "RU"],
+    ["serbia.ics", "RS"],
+    ["singapore.ics", "SG"],
+    ["slovakia.ics", "SK"],
+    ["slovenia.ics", "SI"],
+    ["southafrica.ics", "ZA"],
+    ["southkorea.ics", "KR"],
+    ["spain.ics", "ES"],
+    // TODO add Sri Lanka: (no GH issue)
+    // ["srilanka.ics", ""],
+    ["sweden.ics", "SE"],
+    ["switzerland.ics", "CH"],
+    ["taiwan.ics", "TW"],
+    ["thailand.ics", "TH"],
+    ["turkey.ics", "TR"],
+    ["ukraine.ics", "UA"],
+    ["unitedkingdom.ics", "GB"],
+    ["unitedstates.ics", "US"],
+    ["uruguay.ics", "UY"],
+];
+
+export const START_YEAR = new Date().getFullYear(); // start with current year
+export const END_YEAR = START_YEAR + 1;
+export const FIXED_DATE_START_YEAR = 1970; // start recurring events from start of Unix epoch
+
+// https://www.npmjs.com/package/date-holidays#types-of-holidays
+export const TYPE_WHITELIST = ["public", "bank"];

.github/workflows/holiday-generator/main.js

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+import { createHash } from "node:crypto";
+import { writeFile } from "node:fs/promises";
+import { join } from "node:path";
+import { promisify } from "node:util";
+
+import Holidays from "date-holidays";
+import { createEvents as icsCreateEvents } from "ics";
+
+import { COUNTRIES, END_YEAR, FIXED_DATE_START_YEAR, ICS_PATH, SHOULD_LOG, START_YEAR, TYPE_WHITELIST } from "./config.js";
+
+// converting createEvents from ics from function with callback to async function for easier usage
+const createEvents = promisify(icsCreateEvents);
+
+/**
+ * Log info to console
+ * @param {*} toLog
+ */
+function log(toLog) {
+    if (SHOULD_LOG) {
+        console.log(toLog);
+    }
+}
+
+/**
+ * Get events for country given by code
+ * @param {string} countryCode
+ * @returns
+ */
+function getEvents(countryCode) {
+    const generator = new Holidays(countryCode);
+    const events = [];
+    for (let i = START_YEAR; i <= END_YEAR; i++) {
+        events.push(...generator.getHolidays(i).filter((x) => TYPE_WHITELIST.includes(x.type)));
+    }
+    return events;
+}
+
+/**
+ * Generates reproducible ID for holiday
+ * @param {string} countryCode
+ * @param {string} date
+ * @param {string} rule
+ * @returns
+ */
+function generateUid(countryCode, date, rule) {
+    const hashGen = createHash("sha256");
+    hashGen.update(`${countryCode},${date},${rule}`);
+    return hashGen.digest("hex");
+}
+
+/**
+ * Convert JS Date object to ics.DateTime array
+ * @param {Date} date
+ * @returns
+ */
+function getDateArray(date) {
+    return [date.getFullYear(), date.getMonth() + 1, date.getDate()];
+}
+
+/**
+ * Checks if holiday is a fixed-date holiday.
+ * Regex based on https://github.com/commenthol/date-holidays/blob/master/docs/specification.md#fixed-date
+ * @param {string} rule
+ * @returns
+ */
+function isFixedDate(rule) {
+    return /^\d\d-\d\d$/.test(rule);
+}
+
+/**
+ * Generate ical file from given set of events
+ * @param {ReturnType<getEvents>} events
+ * @param {string} countryCode
+ * @returns {Promise<string>}
+ */
+async function generateIcal(events, countryCode) {
+    const eventsMap = new Map();
+    events.forEach((x) => {
+        if (isFixedDate(x.rule)) {
+            const uid = generateUid(countryCode, "", x.rule);
+            if (!eventsMap.has(uid)) {
+                const yearDiff = x.end.getFullYear() - x.start.getFullYear();
+                x.start.setFullYear(FIXED_DATE_START_YEAR);
+                x.end.setFullYear(FIXED_DATE_START_YEAR + yearDiff);
+                eventsMap.set(uid, {
+                    title: x.name,
+                    uid,
+                    start: getDateArray(x.start),
+                    end: getDateArray(x.end),
+                    recurrenceRule: "FREQ=YEARLY",
+                    productId: "Fossify Calendar Holiday Generator",
+                    status: "CONFIRMED",
+                });
+            }
+        } else {
+            const uid = generateUid(countryCode, x.date, x.rule);
+            eventsMap.set(uid, {
+                title: x.name,
+                uid,
+                start: getDateArray(x.start),
+                end: getDateArray(x.end),
+                productId: "Fossify Calendar Holiday Generator",
+                status: "CONFIRMED",
+            });
+        }
+    });
+    const ical = await createEvents([...eventsMap.values()]);
+    return ical;
+}
+
+/**
+ * Function generating ical files
+ */
+async function doWork() {
+    for (const [file, code] of COUNTRIES) {
+        log(`Generating events for ${code}, ${file}`);
+        const events = getEvents(code);
+        const ical = await generateIcal(events, code);
+        const filePath = join(ICS_PATH, file);
+        await writeFile(filePath, ical, { encoding: "utf-8" });
+        log(`File saved to ${filePath}`);
+    }
+}
+
+await doWork();

.github/workflows/holiday-generator/package.json

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+{
+  "name": "@fossify/holiday-generator",
+  "version": "1.0.0",
+  "description": "Holiday generator for Fossify Calendar",
+  "main": "main.js",
+  "type": "module",
+  "scripts": {
+    "start": "node main.js"
+  },
+  "license": "GPL-3.0-only",
+  "dependencies": {
+    "date-holidays": "^3",
+    "ics": "^3.7.2"
+  }
+}