feat: redis cache and detach image into s3

utils/image-processor.mjs

@@ -0,0 +1,43 @@
+// utils/image-processor.mjs
+import { logger } from './logger.mjs'; // Using the logger
+
+/**
+ * Extracts base64 content and format from a data URL string.
+ * E.g., "data:image/jpeg;base64,xxxxxxxxxxxxxxx"
+ * @param {string} dataUrl The full data URL string.
+ * @returns {object|null} An object { base64Content: string, format: string } or null if not found.
+ */
+export function extractBase64Image(dataUrl) {
+    if (typeof dataUrl !== 'string' || !dataUrl.startsWith('data:image/')) {
+        return null;
+    }
+
+    const markers = [
+        { prefix: "data:image/png;base64,", format: "png" },
+        { prefix: "data:image/jpeg;base64,", format: "jpeg" },
+        { prefix: "data:image/jpg;base64,", format: "jpg" },
+        { prefix: "data:image/gif;base64,", format: "gif" },
+        { prefix: "data:image/svg+xml;base64,", format: "svg" }, // svg+xml -> svg
+        { prefix: "data:image/webp;base64,", format: "webp" }
+    ];
+
+    for (const marker of markers) {
+        if (dataUrl.startsWith(marker.prefix)) {
+            const base64Content = dataUrl.substring(marker.prefix.length);
+            logger.debug(`Found image of format: ${marker.format}`);
+            return { base64Content, format: marker.format };
+        }
+    }
+
+    logger.warn("No known base64 image marker found in the provided data URL:", dataUrl.substring(0, 50) + "...");
+    return null;
+}
+
+/**
+ * Decodes a base64 string to a Buffer.
+ * @param {string} base64String The base64 encoded string (without the data URI prefix).
+ * @returns {Buffer}
+ */
+export function decodeBase64Image(base64String) {
+    return Buffer.from(base64String, 'base64');
+}