fix(lib-storage): restrict lstat calls to fs.ReadStream objects

Author: kuhe

lib/lib-storage/src/byteLength.ts

@@ -29,8 +29,7 @@ export const byteLength = (input: any): number | undefined => {
   } else if (typeof input.start === "number" && typeof input.end === "number") {
     // file read stream with range.
     return input.end + 1 - input.start;
-  } else if (typeof input.path === "string") {
-    // file read stream with path.
+  } else if (runtimeConfig.isFileReadStream(input)) {
     try {
       return runtimeConfig.lstatSync(input.path).size;
     } catch (error) {

lib/lib-storage/src/runtimeConfig.shared.ts

@@ -3,4 +3,7 @@
  */
 export const runtimeConfigShared = {
   lstatSync: () => {},
+  isFileReadStream(f: unknown) {
+    return false;
+  },
 };

lib/lib-storage/src/runtimeConfig.ts

@@ -1,4 +1,4 @@
-import { lstatSync } from "fs";
+import { lstatSync, ReadStream } from "fs";
 
 import { runtimeConfigShared as shared } from "./runtimeConfig.shared";
 
@@ -9,4 +9,7 @@ export const runtimeConfig = {
   ...shared,
   runtime: "node",
   lstatSync,
+  isFileReadStream(f: unknown): f is ReadStream {
+    return f instanceof ReadStream;
+  },
 };