@tus/azure-store: Cannot download file

[osarogie]

Hi! 👋

Firstly, thanks for your work on this project! 🙂

Today I used patch-package to patch @tus/azure-store@2.0.0 for the project I'm working on.

Steps to reproduce:

1. Uploading a file to azure blob store.
2. Navigate to uploaded file url provided by the Tus Server.
3. Request fails with 500 error and message "Metadata string is not valid".

Here is the diff that solved my problem:

diff --git a/node_modules/@tus/azure-store/dist/index.js b/node_modules/@tus/azure-store/dist/index.js
index 77efab1..1ad25c9 100644
--- a/node_modules/@tus/azure-store/dist/index.js
+++ b/node_modules/@tus/azure-store/dist/index.js
@@ -71,7 +71,7 @@ export class AzureStore extends DataStore {
         const upload = JSON.parse(propertyData.metadata.upload);
         // Metadata is base64 encoded to avoid errors for non-ASCII characters
         // so we need to decode it separately
-        upload.metadata = Metadata.parse(JSON.stringify(upload.metadata ?? {}));
+        let metadataStr
+        if (typeof upload.metadata === 'string') {
+          metadataStr = upload.metadata
+        } else if (upload.metadata && typeof upload.metadata === 'object') {
+          metadataStr = JSON.stringify(upload.metadata??{})
+        } else {
+          metadataStr = '{}'
+        }
+        upload.metadata = Metadata.parse(metadataStr)
         await this.cache.set(appendBlobClient.url, upload);
         log('metadata returned from blob get properties');
         return upload;

This issue body was partially generated by patch-package.