added possibility to download latest images

generate.mjs

@@ -0,0 +1,55 @@
+import fs from 'fs';
+import client from 'https';
+
+function getTimeString(count) {
+    let date = new Date(Date.now() - count * 60000 * 5);
+    return (
+        date.getFullYear().toString()
+        + (date.getMonth() + 1).toString().padStart(2, "0")
+        + date.getDate().toString().padStart(2, "0")
+        + date.getHours().toString().padStart(2, "0")
+        + (date.getMinutes() - date.getMinutes() % 5).toString().padStart(2, "0")
+    );
+}
+
+function downloadImage(time_string, filepath) {
+    return new Promise((resolve, reject) => {
+        let options = {
+            hostname: 'www.nea.gov.sg',
+            port: 443,
+            path: `/docs/default-source/rain-area/dpsri_70km_${time_string}0000dBR.dpsri.png`,
+            headers: {
+                'Host': 'www.nea.gov.sg',
+                'User-Agent': 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:129.0) Gecko/20100101 Firefox/129.0',
+                'Accept': 'image/avif,image/webp,image/png,image/svg+xml,image/*;q=0.8,*/*;q=0.5',
+                'Accept-Language': 'en-US,en;q=0.5',
+            }
+        }
+        client.get(options, (res) => {
+            console.log(`Downloading ${time_string}`);
+            if (res.statusCode === 200) {
+                res.pipe(fs.createWriteStream(filepath))
+                    .on('error', reject)
+                    .once('close', () => resolve(filepath));
+            } else {
+                // Consume response data to free up memory
+                res.resume();
+                reject(new Error(`Request Failed With a Status Code: ${res.statusCode}`));
+
+            }
+        });
+    });
+}
+
+export async function initImages(count) {
+    for (let i = count; i >= 0; i--) {
+        let time_string = getTimeString(i);
+        let filename = `images/${time_string}.png`;
+        try {
+            await downloadImage(time_string, filename)
+        } catch (error) {
+            //Response 302, we've reached the latest available image
+            return;
+        }
+    }
+}