Authenticating BlobContainerClient with Azure SDK for Java

Question

What are the recommended methods for authenticating com.azure.storage.blob.BlobContainerClient to allow user access to a blob container and its blobs? There appear to be multiple approaches to manage permissions and credentials. Can you provide some examples for creating a BlobContainerClient with the necessary access? Much appreciated! Also going through the docs and will post a few answers if I find them.

Answer 1

Hello,

Welcome to Microsoft Q&A,

1. Using Azure Identity (Recommended for Managed Identity & Azure AD):

Use DefaultAzureCredential to automatically select the best credential (ideal for Managed Identity, Environment variables, or developer login).

import com.azure.identity.DefaultAzureCredentialBuilder;
import com.azure.storage.blob.BlobContainerClient;
import com.azure.storage.blob.BlobContainerClientBuilder;

BlobContainerClient client = new BlobContainerClientBuilder()
    .credential(new DefaultAzureCredentialBuilder().build())
    .endpoint("https://<your-storage-account>.blob.core.windows.net/<your-container>")
    .buildClient();

2. Using a Connection String (Not recommended for production)

String connectionString = "DefaultEndpointsProtocol=https;AccountName=...;AccountKey=...;EndpointSuffix=core.windows.net";
BlobContainerClient client = new BlobContainerClientBuilder()
    .connectionString(connectionString)
    .containerName("your-container-name")
    .buildClient();

3. Using a Shared Access Signature (SAS)

Use a SAS token to give limited access.

String sasUrl = "https://<your-storage-account>.blob.core.windows.net/<your-container>?<sas-token>";

BlobContainerClient client = new BlobContainerClientBuilder()
    .endpoint(sasUrl)
    .buildClient();

https://learn.microsoft.com/en-us/java/api/overview/azure/storage-blob-readme?view=azure-java-stable#authenticate-the-client

https://learn.microsoft.com/en-us/java/api/overview/azure/identity-readme?view=azure-java-stable

Please Upvote and accept the answer if it helps!!