[MOO-1862]: Signature base64 to image

packages/jsActions/nanoflow-actions-native/CHANGELOG.md

@@ -6,10 +6,13 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 
+### Fixed
+
+-   We've fixed a synchronization issue with Base64 images generated by the Signature widget.
+
 ## [5.2.0] Nanoflow Commons - 2026-1-23
 
 -   We've migrated from using @react-native-community/geolocation to react-native-permissions for handling location permissions.
--
 
 ## [5.1.6] Nanoflow Commons - 2025-12-05
 

packages/jsActions/nanoflow-actions-native/src/other/Base64DecodeToImage.ts

@@ -6,6 +6,7 @@
 // - the code between BEGIN EXTRA CODE and END EXTRA CODE
 // Other code you write will be lost the next time you deploy the project.
 import { Base64 } from "js-base64";
+import RNBlobUtil from "react-native-blob-util";
 
 // BEGIN EXTRA CODE
 // END EXTRA CODE
@@ -16,7 +17,7 @@ import { Base64 } from "js-base64";
  * @param {MxObject} image
  * @returns {Promise.<boolean>}
  */
-export function Base64DecodeToImage(base64: string, image: mendix.lib.MxObject): Promise<boolean> {
+export async function Base64DecodeToImage(base64: string, image: mendix.lib.MxObject): Promise<boolean> {
     // BEGIN USER CODE
 
     if (!base64) {
@@ -26,11 +27,52 @@ export function Base64DecodeToImage(base64: string, image: mendix.lib.MxObject):
         throw new Error("image should not be null");
     }
 
-    const blob = new Blob([Base64.toUint8Array(base64)], { type: "image/png" });
+    // Native platform
+    if (navigator && navigator.product === "ReactNative") {
+        try {
+            // Remove data URI prefix if present (e.g., "data:image/png;base64,")
+            let cleanBase64 = base64;
+            if (base64.includes(",")) {
+                cleanBase64 = base64.split(",")[1];
+            }
+
+            // Remove any whitespace/newlines
+            cleanBase64 = cleanBase64.replace(/\s/g, "");
+
+            // Validate base64 format
+            if (!/^[A-Za-z0-9+/]*={0,2}$/.test(cleanBase64)) {
+                throw new Error("Invalid base64 format");
+            }
+
+            // Create a temporary file path
+            const tempPath = `${RNBlobUtil.fs.dirs.CacheDir}/temp_image_${Date.now()}.png`;
+
+            // Write Base64 data to a temporary file
+            await RNBlobUtil.fs.writeFile(tempPath, cleanBase64, "base64");
 
+            // Fetch the file as a blob
+            const res = await fetch(`file://${tempPath}`);
+            const blob = await res.blob();
+
+            return new Promise((resolve, reject) => {
+                mx.data.saveDocument(image.getGuid(), "camera image", {}, blob, () => {
+                    RNBlobUtil.fs.unlink(tempPath).catch(() => { });
+                    resolve(true);
+                }, (error) => {
+                    RNBlobUtil.fs.unlink(tempPath).catch(() => { });
+                    reject(error);
+                });
+            });
+        } catch (error) {
+            const errorMessage = error instanceof Error ? error.message : String(error);
+            throw new Error(`Failed to decode base64 to image: ${errorMessage}`);
+        }
+    }
+
+    // Other platforms
+    const blob = new Blob([Base64.toUint8Array(base64)], { type: "image/png" });
     return new Promise((resolve, reject) => {
         mx.data.saveDocument(image.getGuid(), "camera image", {}, blob, () => resolve(true), reject);
     });
-
     // END USER CODE
 }