Use JavaScript SDK in Node.js to manage ACLs in Azure Data Lake Storage

This article shows you how to use Node.js to get, set, and update the access control lists of directories and files.

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Prerequisites

• Azure subscription - create one for trial.
• Azure storage account that has hierarchical namespace (HNS) enabled. Follow these instructions to create one.
• Node.js LTS
• Azure CLI version 2.6.0 or higher.
• One of the following security permissions:
  • A provisioned Microsoft Entra ID security principal that has been assigned the Storage Blob Data Owner role, scoped to the target container, storage account, parent resource group, or subscription.
  • Owning user of the target container or directory to which you plan to apply ACL settings. To set ACLs recursively, this includes all child items in the target container or directory.
  • Storage account key.

Set up your project

This section walks you through preparing a project to work with the Azure Data Lake Storage client library for JavaScript.

Install packages

Install packages for the Azure Data Lake Storage and Azure Identity client libraries using the npm install command. The @azure/identity package is needed for passwordless connections to Azure services.

npm install @azure/storage-file-datalake
npm install @azure/identity

Load modules

Add the following code at the top of your file to load the required modules:

const {
AzureStorageDataLake,
DataLakeServiceClient,
StorageSharedKeyCredential
} = require("@azure/storage-file-datalake");

const { DefaultAzureCredential } = require('@azure/identity');

Connect to the account

To run the code examples in this article, you need to create a DataLakeServiceClient instance that represents the storage account. You can authorize the client object with Microsoft Entra ID credentials or with an account key.

function GetDataLakeServiceClientAD(accountName) {

  const dataLakeServiceClient = new DataLakeServiceClient(
      `https://${accountName}.dfs.core.chinacloudapi.cn`,
      new DefaultAzureCredential()
  );

  return dataLakeServiceClient;
}

function GetDataLakeServiceClient(accountName, accountKey) {

  const sharedKeyCredential =
     new StorageSharedKeyCredential(accountName, accountKey);

  const dataLakeServiceClient = new DataLakeServiceClient(
      `https://${accountName}.dfs.core.chinacloudapi.cn`, sharedKeyCredential);

  return dataLakeServiceClient;
}

Get and set a directory ACL

This example gets and then sets the ACL of a directory named my-directory. This example gives the owning user read, write, and execute permissions, gives the owning group only read and execute permissions, and gives all others read access.

async function ManageDirectoryACLs(fileSystemClient) {

    const directoryClient = fileSystemClient.getDirectoryClient("my-directory");
    const permissions = await directoryClient.getAccessControl();

    console.log(permissions.acl);

    const acl = [
    {
      accessControlType: "user",
      entityId: "",
      defaultScope: false,
      permissions: {
        read: true,
        write: true,
        execute: true
      }
    },
    {
      accessControlType: "group",
      entityId: "",
      defaultScope: false,
      permissions: {
        read: true,
        write: false,
        execute: true
      }
    },
    {
      accessControlType: "other",
      entityId: "",
      defaultScope: false,
      permissions: {
        read: true,
        write: true,
        execute: false
      }

    }

  ];

  await directoryClient.setAccessControl(acl);
}

You can also get and set the ACL of the root directory of a container. To get the root directory, pass an empty string (/) into the DataLakeFileSystemClient.getDirectoryClient method.

Get and set a file ACL

This example gets and then sets the ACL of a file named upload-file.txt. This example gives the owning user read, write, and execute permissions, gives the owning group only read and execute permissions, and gives all others read access.

async function ManageFileACLs(fileSystemClient) {

  const fileClient = fileSystemClient.getFileClient("my-directory/uploaded-file.txt");
  const permissions = await fileClient.getAccessControl();

  console.log(permissions.acl);

  const acl = [
  {
    accessControlType: "user",
    entityId: "",
    defaultScope: false,
    permissions: {
      read: true,
      write: true,
      execute: true
    }
  },
  {
    accessControlType: "group",
    entityId: "",
    defaultScope: false,
    permissions: {
      read: true,
      write: false,
      execute: true
    }
  },
  {
    accessControlType: "other",
    entityId: "",
    defaultScope: false,
    permissions: {
      read: true,
      write: true,
      execute: false
    }

  }

];

await fileClient.setAccessControl(acl);
}

See also

• Package (Node Package Manager)
• Samples
• Give Feedback
• Access control model in Azure Data Lake Storage
• Access control lists (ACLs) in Azure Data Lake Storage