Power BI Connector for Slack

Build 22.0.8389

Headless Machines

Using OAuth on a Headless Machine

To create Slack data sources on headless servers or other machines on which the connector cannot open a browser, you need to authenticate from another machine. Authentication is a two-step process.

  1. Instead of installing the connector on another machine, you can follow the steps below to obtain the OAuthVerifier value. Or, you can install the connector on another machine and transfer the OAuth authentication values, after you authenticate through the usual browser-based flow.
  2. You can then configure the connector to automatically refresh the access token from the headless machine.

Note that the headless OAuth flow uses several undocumented connection properties -- you can set these in the connection string as usual.

Using the Credentials for a Custom OAuth App

Create a Custom OAuth App

See Creating a Custom OAuth App for a procedure. You can then follow the procedures below to authenticate and connect to data.

Obtain a Verifier Code

Set the following properties on the headless machine:

  • InitiateOAuth: Set to OFF.
  • OAuthClientId: Set to the Client Id in your app settings.
  • OAuthClientSecret: Set to the Client Secret in your app settings.

You can then follow the steps below to authenticate from another machine and obtain the OAuthVerifier connection property.

  1. Call the GetOAuthAuthorizationURL stored procedure with the CallbackURL input parameter set to the exact Redirect URI you specified in your app settings.
  2. Open the returned URL in a browser. Log in and grant permissions to the connector. You are then redirected to the callback URL, which contains the verifier code.
  3. Save the value of the verifier code. You will set this in the OAuthVerifier connection property.

On the headless machine, set the following connection properties to obtain the OAuth authentication values:

  • OAuthClientId: Set to the consumer key in your app settings.
  • OAuthClientSecret: Set to the consumer secret in your app settings.
  • OAuthVerifier: Set to the verifier code.
  • OAuthSettingsLocation: Set to persist the encrypted OAuth authentication values to the specified file.
  • InitiateOAuth: Set to REFRESH.

After the OAuth settings file is generated, set the following properties to connect to data:

  • OAuthClientId: Set to the consumer key in your app settings.
  • OAuthClientSecret: Set to the consumer secret in your app settings.
  • OAuthSettingsLocation: Set to the file containing the encrypted OAuth authentication values. Make sure this file gives read and write permissions to the provider to enable the automatic refreshing of the access token.
  • InitiateOAuth: Set to REFRESH.

Transfer OAuth Settings

Complete the following steps to install the connector on another machine, authenticate, and then transfer the resulting OAuth values:

On a second machine, install the connector and connect with the following properties set:

  • OAuthSettingsLocation: Set to a writable text file.
  • InitiateOAuth: Set to GETANDREFRESH.
  • OAuthClientId: Set to the client Id assigned when you registered your app.
  • OAuthClientSecret: Set to the client secret assigned when you registered your app.
  • CallbackURL: Set to the Redirect URI you specified in your app settings.

Test the connection to authenticate. The resulting authentication values are written, encrypted, to the path specified by OAuthSettingsLocation. Once you have successfully tested the connection, copy the OAuth settings file to your headless machine. On the headless machine, set the following connection properties to connect to data:

  • InitiateOAuth: Set to REFRESH.
  • OAuthClientId: Set to the consumer key in your app settings.
  • OAuthClientSecret: Set to the consumer secret in your app settings.
  • OAuthSettingsLocation: Set to the path to your OAuth settings file. Make sure this file gives read and write permissions to the connector to enable the automatic refreshing of the access token.

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Build 22.0.8389