adds waypoint images

web/src/lib/util/file_util.ts

@@ -5,4 +5,15 @@ export function getFileURL(record: { [key: string]: any; }, filename?: string) {
     }
 
     return `/api/v1/files/${record.collectionId}/${record.id}/${filename}`
-}
+}
+
+export function readAsDataURLAsync(file: File) {
+    return new Promise<string>((resolve, reject) => {
+        var fr = new FileReader();
+        fr.onload = () => {
+            resolve(fr.result as string);
+        };
+        fr.onerror = reject;
+        fr.readAsDataURL(file);
+    });
+}