Adding Databricks Azure tokens (Bearer token) support. (Issue #121)

[divyavanmahajan]

Issue #121 : Support Azure AD Tokens instead of PAT tokens

PAT vs Azure AD tokens - PAT tokens are workspace specific and usually have a long expiry. Azure AD tokens expire within a few hours and the same token will work across all workspaces with SSO enabled.

The NodeJS SQL driver was extended to support Azure AD tokens.

Description of change:

• Introduces useAADToken in connection options.
• When useAADToken=true, the PlainHTTPAuthentication class will send a Bearer authorization header with the Azure AD token, instead of the Basic authorization header when using a PAT token.
• Unit tests extended for PlainHTTPAuthentication for Azure tokens.
• E2E tests extended to support AAD Tokens

Workaround:
To use AAD token - you can tweak (@databricks/sql 1.1.1) as follows to use Azure AD tokens.

const { DBSQLClient, auth } = require('@databricks/sql');
// Patch to Databricks SQL driver to send Azure AD token as Bearer token.
Reflect.defineProperty(auth.PlainHttpAuthentication.prototype, 'getToken', {
  value: function () {
    return `Bearer ${this.password}`
  }
})

// Use normally - replacing token with your AAD token.

Submitted by:
Divya van Mahajan divyavanmahajan@users.noreply.github.com

[divyavanmahajan]

Closed. Incorrect branch. Will resubmit.