refactor: deduplicate encryption helpers (#4146)

src/data/blob.ts

@@ -11,6 +11,7 @@ import { CanvasError } from "../errors";
 import { t } from "../i18n";
 import { calculateScrollCenter } from "../scene";
 import { AppState, DataURL } from "../types";
+import { bytesToHexString } from "../utils";
 import { FileSystemHandle } from "./filesystem";
 import { isValidExcalidrawData } from "./json";
 import { restore } from "./restore";
@@ -195,26 +196,18 @@ export const canvasToBlob = async (
 
 /** generates SHA-1 digest from supplied file (if not supported, falls back
     to a 40-char base64 random id) */
-export const generateIdFromFile = async (file: File) => {
-  let id: FileId;
+export const generateIdFromFile = async (file: File): Promise<FileId> => {
   try {
     const hashBuffer = await window.crypto.subtle.digest(
       "SHA-1",
       await file.arrayBuffer(),
     );
-    id =
-      // convert buffer to byte array
-      Array.from(new Uint8Array(hashBuffer))
-        // convert to hex string
-        .map((byte) => byte.toString(16).padStart(2, "0"))
-        .join("") as FileId;
+    return bytesToHexString(new Uint8Array(hashBuffer)) as FileId;
   } catch (error: any) {
     console.error(error);
     // length 40 to align with the HEX length of SHA-1 (which is 160 bit)
-    id = nanoid(40) as FileId;
+    return nanoid(40) as FileId;
   }
-
-  return id;
 };
 
 export const getDataURL = async (file: Blob | File): Promise<DataURL> => {