How to connect to BlobServiceClient in Azure sdk for python using access token on behalf of user generated with the help of msal

Question

I am try to use the below code to connect to storage account blobs using the access token that has been generated against the below scope :

> scopes : ['https://storage.azure.com/user_impersonation']
> ```
> 
> 
>  access token is correct since i am able to call the rest api for storage account to list the containers. But below code does not works as expected. Any help on this will be super helpful !!:
> 
```python
> 
> def list_containers_(access_token, page=1, page_size=10):
> 	try:
> 		account_url = "https://{}.blob.core.windows.net".format("userdatastore")
> 		blob_svc = BlobServiceClient(account_url=account_url, credential=access_token)
> 		
> 		containers = blob_svc.list_containers(include_metadata=True)
> 		total_length = 0
> 
> 		container_data=[]
> 		
> 		for i in containers:
> 			if i["name"] in ["azure-webjobs-hosts", "azure-webjobs-secrets"]:
> 				continue
> 			i["metadata"]["name"] = i["name"]
> 			i["metadata"]["size"] = container_size(blob_svc, i["name"])
> 			container_data.append(i["metadata"])
> 			total_length += 1
> 
> 
> 		start_idx = (page - 1) * page_size
> 		end_idx = start_idx + page_size
> 		paginated_container_data = container_data[start_idx:end_idx]
> 
> 		return paginated_container_data, {"total_length": total_length, "page_no": page, "page_size": page_size}
>     
> 	except Exception as e:
> 	    return str(e), 400
> ```
> 
> 
> 

Answer 1

@Ashish Singh Thanks for reaching out to Microsoft Q&A.

It seems like you are trying to list the containers in the Azure Blob Storage using the access token. The code seems to be working fine, but it is missing the import statement for the BlobServiceClient class. You need to add the following import statement at the top of your code: python from azure.storage.blob import BlobServiceClient Also, it is recommended to wrap the code in a try-except block to handle exceptions and return a meaningful error message to the user.

Please try the above and let me know if it displays the error message in more detail so we can go from there. Thanks!