Add EUR currency support with multi-language translations

- Created EUR calculation module (calculate-eur.js) for EUR-based satoshi calculations
- Created btcpoll-eur.js to fetch and store EUR historical data from CoinGecko API
- Added EUR historical data file structure (public/eur_historical)
- Created locale files for 8 European languages (English, German, French, Spanish, Italian, Dutch, Portuguese, Polish)
- Updated index.js with EUR routes for all language variants (/en-eur, /de, /fr, /es, /it, /nl, /pt, /pl)
- Made template (sats.hbs) dynamic to support both HKD and EUR currencies with configurable exchange rates
- Updated template to support up to 7 language links for EUR version
- Added updaterate-eur.js for GitHub Actions to update EUR data daily
- Updated GitHub Actions workflow to run both HKD and EUR data updates
- Updated all locale files (HKD and EUR) with data_file, rate_field, and exchange_rate parameters

This implementation allows the site to work with EUR currency and supports translations
to all major European languages, preparing for deployment at eursat.eu domain.

.github/workflows/main.yml

@@ -21,9 +21,10 @@ jobs:
           
       - name: add and push
         run: |
-          npm install 
+          npm install
           npm install axios@0.26.1 --save
           node updaterate.js
+          node updaterate-eur.js
           date > generated.txt
           git config user.name github-actions
           git config user.email github-actions@github.com

btcpoll-eur.js

@@ -0,0 +1,80 @@
+const fs = require('fs')
+const axios = require('axios');
+const moment = require('moment');
+
+const path = require('path');
+const dirPath = path.join(__dirname, ".");
+const fileToWrite = dirPath + "/public/eur_historical"
+const fileToRead = dirPath + "/public/eur_historical"
+
+
+// get btc/usd and btc/eur daily rate
+async function BTCDaily() {
+    let url = "https://api.coingecko.com/api/v3/coins/bitcoin/history?localization=false&date="
+
+    const yesterday = moment().subtract(1, 'days') // YYYY-MM-DD
+    const reverse = yesterday.format('DD-MM-YYYY')
+
+    // format is YYYY-MM-DD
+    const dbdate = yesterday.format('YYYY-MM-DD')
+    let full_url = url + reverse
+    let row = {}
+    //console.log("db date: ", dbdate)
+    //console.log("new date format:  ", reverse, "\n")
+
+    await axios.get(full_url).then(
+        async function(response) {
+            // console.log("full url: ", full_url)
+            const data = await response.data;
+            const btcusd = data['market_data']['current_price']['usd']
+            const btceur = data['market_data']['current_price']['eur']
+            const satsrate = 100000000
+            const sateur = parseInt(satsrate / btceur)
+            const usdsat = parseInt(satsrate / btcusd)
+
+            row = {
+                btcusd_rate: parseInt(btcusd),
+                date: dbdate,
+                usdsat_rate: usdsat,
+                sateur_rate: sateur,
+                btceur_rate: parseFloat(btceur).toFixed(2),
+            }
+            console.log("row data: ", row)
+        })
+    return row
+}
+
+// update file in the target github repo
+async function updateFile() {
+    const row = await BTCDaily()
+    //const row = []
+
+    if (Object.keys(row).length > 0) {
+        //console.log("dirpath", dirPath)
+        //console.log("dirname", __dirname)
+        const original = await fs.readFileSync(fileToRead)
+        let orig = JSON.parse(original)
+        //console.log(orig[0])
+        orig.push(row)
+        //console.log(orig[orig.length - 1])
+        const new_content = JSON.stringify(orig)
+        await fs.writeFileSync(fileToWrite, new_content);
+    }
+}
+
+module.exports = {
+
+    // start here
+    main: async function () {
+        console.log("starting btcpoll script for sateur....")
+        let result = updateFile();
+        console.log(result)
+        return true
+    }
+}
+
+
+//const res = main()
+//console.log('Result from main() : ', res)
+
+

calculate-eur.js

@@ -0,0 +1,58 @@
+const axios = require('axios')
+const fs = require('fs');
+
+module.exports = {
+    bfx: async function() {
+        const eurrate = 0.92 // approximate EUR/USD rate
+        const btcDataURL = "https://api-pub.bitfinex.com/v2/ticker/tBTCUSD"
+        const response = await axios.get(btcDataURL)
+        const data = response.data
+            //console.log(data[6])
+
+        const satDenominator = 100000000
+            // see docs : https://docs.bitfinex.com/reference#rest-public-ticker
+        btcLastPrice = data[6]
+
+        const sateur = Math.round((1 / btcLastPrice) * satDenominator * eurrate)
+            //console.log("bitfinex last price: ", btcLastPrice, "current satEUR: ", sateur)
+        return sateur
+    },
+
+    get10yr: async function() {
+        //        console.log("get10yr")
+        try {
+            // const content = await fs.readFile('./public/eur_historical')
+            const content = fs.readFileSync('./public/eur_historical', { encoding: 'utf8' })
+
+            const historical = JSON.parse(content)
+            hist_entries = []
+            let datelist = []
+
+            // get all the years you need from 1 - 10
+            for (let i = 1; i < 11; i++) {
+                const y = new Date(new Date().setFullYear(new Date().getFullYear() - i)).toISOString().slice(0, 10)
+                datelist.push(y)
+            }
+            for (let j = 0; j < historical.length; j++) {
+                const hdate = historical[j]['date']
+                if (datelist.includes(hdate)) {
+                    hist_entries.push(historical[j])
+                }
+            }
+            //  console.log(hist_entries)
+            let final_list = []
+            let today_sats = await this.bfx()
+            for (var v = 0; v < hist_entries.length; v++) {
+                const date = new Date(hist_entries[v]['date'])
+                year = date.getFullYear();
+                rawsat = hist_entries[v]['sateur_rate']
+                percentage = (-100 * ((rawsat - today_sats) / rawsat)).toFixed(3)
+                final_list.push({ "year": date.toLocaleDateString(), "sats": rawsat.toLocaleString("en-US"), "percent": percentage });
+            }
+            return final_list.reverse()
+        } catch (error) {
+            console.error("Error trying to read file ", error)
+        }
+    }
+
+}

index.js

@@ -11,9 +11,18 @@ const handlebars = require('express-handlebars');
 const port = 3000;
 
 const calculate = require('./calculate')
+const calculateEur = require('./calculate-eur')
 const zhcnjson = require('./locales/zh-cn.json');
 const zhhkjson = require('./locales/zh-hk.json');
 const enjson = require('./locales/en.json');
+const eneurjson = require('./locales/en-eur.json');
+const dejson = require('./locales/de.json');
+const frjson = require('./locales/fr.json');
+const esjson = require('./locales/es.json');
+const itjson = require('./locales/it.json');
+const nljson = require('./locales/nl.json');
+const ptjson = require('./locales/pt.json');
+const pljson = require('./locales/pl.json');
 
 app.set('view engine', 'hbs');
 app.set('views', __dirname + '/views')
@@ -62,6 +71,71 @@ app.get('/zh-hk', function(req, res) {
     })
 });
 
+// EUR routes
+app.get('/en-eur', function(req, res) {
+    calculateEur.get10yr().then(pydata => {
+        const yeardata = { 'yeardata': pydata }
+        let eneurdata = Object.assign(eneurjson, yeardata)
+        res.render('sats', eneurdata)
+    })
+});
+
+app.get('/de', function(req, res) {
+    calculateEur.get10yr().then(pydata => {
+        const yeardata = { 'yeardata': pydata }
+        let dedata = Object.assign(dejson, yeardata)
+        res.render('sats', dedata)
+    })
+});
+
+app.get('/fr', function(req, res) {
+    calculateEur.get10yr().then(pydata => {
+        const yeardata = { 'yeardata': pydata }
+        let frdata = Object.assign(frjson, yeardata)
+        res.render('sats', frdata)
+    })
+});
+
+app.get('/es', function(req, res) {
+    calculateEur.get10yr().then(pydata => {
+        const yeardata = { 'yeardata': pydata }
+        let esdata = Object.assign(esjson, yeardata)
+        res.render('sats', esdata)
+    })
+});
+
+app.get('/it', function(req, res) {
+    calculateEur.get10yr().then(pydata => {
+        const yeardata = { 'yeardata': pydata }
+        let itdata = Object.assign(itjson, yeardata)
+        res.render('sats', itdata)
+    })
+});
+
+app.get('/nl', function(req, res) {
+    calculateEur.get10yr().then(pydata => {
+        const yeardata = { 'yeardata': pydata }
+        let nldata = Object.assign(nljson, yeardata)
+        res.render('sats', nldata)
+    })
+});
+
+app.get('/pt', function(req, res) {
+    calculateEur.get10yr().then(pydata => {
+        const yeardata = { 'yeardata': pydata }
+        let ptdata = Object.assign(ptjson, yeardata)
+        res.render('sats', ptdata)
+    })
+});
+
+app.get('/pl', function(req, res) {
+    calculateEur.get10yr().then(pydata => {
+        const yeardata = { 'yeardata': pydata }
+        let pldata = Object.assign(pljson, yeardata)
+        res.render('sats', pldata)
+    })
+});
+
 
 //Makes the app listen to port 3000
 app.listen(port, () => console.log(`App listening to port ${port}`));

locales/de.json

@@ -0,0 +1,35 @@
+{
+    "post": {
+        "author": "Janith Kasun",
+        "image": "https://picsum.photos/500/500",
+        "comments": [
+            "This is the first comment",
+            "This is the second comment",
+            "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum nec fermentum ligula. Sed vitae erat lectus."
+        ]
+    },
+    "layout": "main",
+    "Title": "1 Euro ist derzeit wert ",
+    "subtitle": "EURSAT Historische Performance",
+    "date": "Datum",
+    "price": "Preis",
+    "percentchange": "Prozentuale Änderung",
+    "footnote": "Datenquelle von usdsat.com, angepasst für EUR",
+    "data_file": "eur_historical",
+    "rate_field": "sateur_rate",
+    "exchange_rate": "0.92",
+    "lang1_link": "/en-eur/",
+    "lang1": "English",
+    "lang2_link": "/fr/",
+    "lang2": "Français",
+    "lang3_link": "/es/",
+    "lang3": "Español",
+    "lang4_link": "/it/",
+    "lang4": "Italiano",
+    "lang5_link": "/nl/",
+    "lang5": "Nederlands",
+    "lang6_link": "/pt/",
+    "lang6": "Português",
+    "lang7_link": "/pl/",
+    "lang7": "Polski"
+}

locales/en-eur.json

@@ -0,0 +1,35 @@
+{
+    "post": {
+        "author": "Janith Kasun",
+        "image": "https://picsum.photos/500/500",
+        "comments": [
+            "This is the first comment",
+            "This is the second comment",
+            "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum nec fermentum ligula. Sed vitae erat lectus."
+        ]
+    },
+    "layout": "main",
+    "Title": "1 Euro is currently worth ",
+    "subtitle": "EURSAT Historical Performance",
+    "date": "Date",
+    "price": "Price",
+    "percentchange": "Percent Change",
+    "footnote": "data source from usdsat.com, adapted for EUR",
+    "data_file": "eur_historical",
+    "rate_field": "sateur_rate",
+    "exchange_rate": "0.92",
+    "lang1_link": "/de/",
+    "lang1": "Deutsch",
+    "lang2_link": "/fr/",
+    "lang2": "Français",
+    "lang3_link": "/es/",
+    "lang3": "Español",
+    "lang4_link": "/it/",
+    "lang4": "Italiano",
+    "lang5_link": "/nl/",
+    "lang5": "Nederlands",
+    "lang6_link": "/pt/",
+    "lang6": "Português",
+    "lang7_link": "/pl/",
+    "lang7": "Polski"
+}

locales/en.json

@@ -15,6 +15,9 @@
     "price": "Price",
     "percentchange": "Percent Change",
     "footnote": "data source from usdsat.com, adapted for HKD",
+    "data_file": "hkd_historical",
+    "rate_field": "sathkd_rate",
+    "exchange_rate": "7.75",
     "lang1_link": "/zh-cn/",
     "lang1": "中文(中国)",
     "lang2_link": "/zh-hk/",

locales/es.json

@@ -0,0 +1,35 @@
+{
+    "post": {
+        "author": "Janith Kasun",
+        "image": "https://picsum.photos/500/500",
+        "comments": [
+            "This is the first comment",
+            "This is the second comment",
+            "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum nec fermentum ligula. Sed vitae erat lectus."
+        ]
+    },
+    "layout": "main",
+    "Title": "1 Euro vale actualmente ",
+    "subtitle": "Rendimiento Histórico EURSAT",
+    "date": "Fecha",
+    "price": "Precio",
+    "percentchange": "Cambio Porcentual",
+    "footnote": "fuente de datos de usdsat.com, adaptado para EUR",
+    "data_file": "eur_historical",
+    "rate_field": "sateur_rate",
+    "exchange_rate": "0.92",
+    "lang1_link": "/en-eur/",
+    "lang1": "English",
+    "lang2_link": "/de/",
+    "lang2": "Deutsch",
+    "lang3_link": "/fr/",
+    "lang3": "Français",
+    "lang4_link": "/it/",
+    "lang4": "Italiano",
+    "lang5_link": "/nl/",
+    "lang5": "Nederlands",
+    "lang6_link": "/pt/",
+    "lang6": "Português",
+    "lang7_link": "/pl/",
+    "lang7": "Polski"
+}

locales/fr.json

@@ -0,0 +1,35 @@
+{
+    "post": {
+        "author": "Janith Kasun",
+        "image": "https://picsum.photos/500/500",
+        "comments": [
+            "This is the first comment",
+            "This is the second comment",
+            "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum nec fermentum ligula. Sed vitae erat lectus."
+        ]
+    },
+    "layout": "main",
+    "Title": "1 Euro vaut actuellement ",
+    "subtitle": "Performance Historique EURSAT",
+    "date": "Date",
+    "price": "Prix",
+    "percentchange": "Variation en Pourcentage",
+    "footnote": "source de données de usdsat.com, adaptée pour EUR",
+    "data_file": "eur_historical",
+    "rate_field": "sateur_rate",
+    "exchange_rate": "0.92",
+    "lang1_link": "/en-eur/",
+    "lang1": "English",
+    "lang2_link": "/de/",
+    "lang2": "Deutsch",
+    "lang3_link": "/es/",
+    "lang3": "Español",
+    "lang4_link": "/it/",
+    "lang4": "Italiano",
+    "lang5_link": "/nl/",
+    "lang5": "Nederlands",
+    "lang6_link": "/pt/",
+    "lang6": "Português",
+    "lang7_link": "/pl/",
+    "lang7": "Polski"
+}

locales/it.json

@@ -0,0 +1,35 @@
+{
+    "post": {
+        "author": "Janith Kasun",
+        "image": "https://picsum.photos/500/500",
+        "comments": [
+            "This is the first comment",
+            "This is the second comment",
+            "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum nec fermentum ligula. Sed vitae erat lectus."
+        ]
+    },
+    "layout": "main",
+    "Title": "1 Euro vale attualmente ",
+    "subtitle": "Performance Storica EURSAT",
+    "date": "Data",
+    "price": "Prezzo",
+    "percentchange": "Variazione Percentuale",
+    "footnote": "fonte dati da usdsat.com, adattato per EUR",
+    "data_file": "eur_historical",
+    "rate_field": "sateur_rate",
+    "exchange_rate": "0.92",
+    "lang1_link": "/en-eur/",
+    "lang1": "English",
+    "lang2_link": "/de/",
+    "lang2": "Deutsch",
+    "lang3_link": "/fr/",
+    "lang3": "Français",
+    "lang4_link": "/es/",
+    "lang4": "Español",
+    "lang5_link": "/nl/",
+    "lang5": "Nederlands",
+    "lang6_link": "/pt/",
+    "lang6": "Português",
+    "lang7_link": "/pl/",
+    "lang7": "Polski"
+}

locales/nl.json

@@ -0,0 +1,35 @@
+{
+    "post": {
+        "author": "Janith Kasun",
+        "image": "https://picsum.photos/500/500",
+        "comments": [
+            "This is the first comment",
+            "This is the second comment",
+            "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum nec fermentum ligula. Sed vitae erat lectus."
+        ]
+    },
+    "layout": "main",
+    "Title": "1 Euro is momenteel waard ",
+    "subtitle": "EURSAT Historische Prestaties",
+    "date": "Datum",
+    "price": "Prijs",
+    "percentchange": "Procentuele Verandering",
+    "footnote": "gegevensbron van usdsat.com, aangepast voor EUR",
+    "data_file": "eur_historical",
+    "rate_field": "sateur_rate",
+    "exchange_rate": "0.92",
+    "lang1_link": "/en-eur/",
+    "lang1": "English",
+    "lang2_link": "/de/",
+    "lang2": "Deutsch",
+    "lang3_link": "/fr/",
+    "lang3": "Français",
+    "lang4_link": "/es/",
+    "lang4": "Español",
+    "lang5_link": "/it/",
+    "lang5": "Italiano",
+    "lang6_link": "/pt/",
+    "lang6": "Português",
+    "lang7_link": "/pl/",
+    "lang7": "Polski"
+}

locales/pl.json

@@ -0,0 +1,35 @@
+{
+    "post": {
+        "author": "Janith Kasun",
+        "image": "https://picsum.photos/500/500",
+        "comments": [
+            "This is the first comment",
+            "This is the second comment",
+            "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum nec fermentum ligula. Sed vitae erat lectus."
+        ]
+    },
+    "layout": "main",
+    "Title": "1 Euro jest obecnie warte ",
+    "subtitle": "Historyczna Wydajność EURSAT",
+    "date": "Data",
+    "price": "Cena",
+    "percentchange": "Zmiana Procentowa",
+    "footnote": "źródło danych z usdsat.com, dostosowane dla EUR",
+    "data_file": "eur_historical",
+    "rate_field": "sateur_rate",
+    "exchange_rate": "0.92",
+    "lang1_link": "/en-eur/",
+    "lang1": "English",
+    "lang2_link": "/de/",
+    "lang2": "Deutsch",
+    "lang3_link": "/fr/",
+    "lang3": "Français",
+    "lang4_link": "/es/",
+    "lang4": "Español",
+    "lang5_link": "/it/",
+    "lang5": "Italiano",
+    "lang6_link": "/nl/",
+    "lang6": "Nederlands",
+    "lang7_link": "/pt/",
+    "lang7": "Português"
+}

locales/pt.json

@@ -0,0 +1,35 @@
+{
+    "post": {
+        "author": "Janith Kasun",
+        "image": "https://picsum.photos/500/500",
+        "comments": [
+            "This is the first comment",
+            "This is the second comment",
+            "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum nec fermentum ligula. Sed vitae erat lectus."
+        ]
+    },
+    "layout": "main",
+    "Title": "1 Euro vale atualmente ",
+    "subtitle": "Desempenho Histórico EURSAT",
+    "date": "Data",
+    "price": "Preço",
+    "percentchange": "Variação Percentual",
+    "footnote": "fonte de dados de usdsat.com, adaptado para EUR",
+    "data_file": "eur_historical",
+    "rate_field": "sateur_rate",
+    "exchange_rate": "0.92",
+    "lang1_link": "/en-eur/",
+    "lang1": "English",
+    "lang2_link": "/de/",
+    "lang2": "Deutsch",
+    "lang3_link": "/fr/",
+    "lang3": "Français",
+    "lang4_link": "/es/",
+    "lang4": "Español",
+    "lang5_link": "/it/",
+    "lang5": "Italiano",
+    "lang6_link": "/nl/",
+    "lang6": "Nederlands",
+    "lang7_link": "/pl/",
+    "lang7": "Polski"
+}

locales/zh-cn.json

@@ -5,6 +5,9 @@
     "price": "价格",
     "percentchange": "百分比变化",
     "footnote": "来自usdsat.com的数据源",
+    "data_file": "hkd_historical",
+    "rate_field": "sathkd_rate",
+    "exchange_rate": "7.75",
     "lang1_link": "/",
     "lang1": "EN",
     "lang2_link": "/zh-hk/",

locales/zh-hk.json

@@ -5,6 +5,9 @@
     "price" : "價格",
     "percentchange" : "百分比變化",
     "footnote" : "來自usdsat.com的數據源",
+    "data_file": "hkd_historical",
+    "rate_field": "sathkd_rate",
+    "exchange_rate": "7.75",
     "lang1_link": "/zh-cn/",
     "lang1": "中文(中国)",
     "lang2_link": "/",

public/eur_historical

@@ -0,0 +1 @@
+[]

updaterate-eur.js

@@ -0,0 +1,13 @@
+const core = require('@actions/core');
+const poll = require('./btcpoll-eur');
+
+// modify this to ping url, get data and update, commit and push file to github repo
+try {
+  const res = poll.main()
+  console.log("main response: ", res)
+  core.setOutput('✅ Success');
+
+} catch (error) {
+  core.setFailed(`🛑 ${error.message}`);
+}
+

views/sats.hbs

@@ -58,8 +58,7 @@
                         </li>
                     </ul>
                     <span class="navbar-item" style="color: #fff">
-           <a class="px-2" href="{{ lang1_link }}" style="color: rgb(6, 168, 231)"> {{ lang1 }} </a> |
-           <a class="px-2" href="{{ lang2_link }}" style="color: rgb(6, 168, 231)"> {{ lang2 }}</a>
+           <a class="px-2" href="{{ lang1_link }}" style="color: rgb(6, 168, 231)"> {{ lang1 }} </a>{{#if lang2}} | <a class="px-2" href="{{ lang2_link }}" style="color: rgb(6, 168, 231)"> {{ lang2 }}</a>{{/if}}{{#if lang3}} | <a class="px-2" href="{{ lang3_link }}" style="color: rgb(6, 168, 231)"> {{ lang3 }}</a>{{/if}}{{#if lang4}} | <a class="px-2" href="{{ lang4_link }}" style="color: rgb(6, 168, 231)"> {{ lang4 }}</a>{{/if}}{{#if lang5}} | <a class="px-2" href="{{ lang5_link }}" style="color: rgb(6, 168, 231)"> {{ lang5 }}</a>{{/if}}{{#if lang6}} | <a class="px-2" href="{{ lang6_link }}" style="color: rgb(6, 168, 231)"> {{ lang6 }}</a>{{/if}}{{#if lang7}} | <a class="px-2" href="{{ lang7_link }}" style="color: rgb(6, 168, 231)"> {{ lang7 }}</a>{{/if}}
          </span>
                 </div>
             </div>
@@ -125,7 +124,7 @@
                         i.forEach(function(item) {
                             if (Array.isArray(item)) {
                                 var btc_price = item[0];
-                                currentPrice = Math.round((1 / btc_price) * 100000000 / 7.75); // satoshis per HKD dollar
+                                currentPrice = Math.round((1 / btc_price) * 100000000 / {{ exchange_rate }}); // satoshis per currency unit
                                 document.title = currentPrice.toLocaleString() + " sats";
                                 document.querySelector('#current').textContent = currentPrice.toLocaleString();
 
@@ -165,7 +164,7 @@
                 </p>
             </div>
             <script>
-                d3.json('/hkd_historical', function(data) {
+                d3.json('/{{ data_file }}', function(data) {
                     data = MG.convert.date(data, 'date');
 
                     var windowWidth = $(window).width();
@@ -230,7 +229,7 @@
                         xax_count: 16,
                         yax_count: 12,
                         x_accessor: 'date',
-                        y_accessor: 'sathkd_rate',
+                        y_accessor: '{{ rate_field }}',
                         y_scale_type: 'log',
                         y_extended_ticks: true,
                         yax_units: ' sats',