#Drupal oAuth Integration module. This module works in conjunction with the Rocket.Chat+ Module for Drupal Version 7.x-1.1 or later.

A full set of instructions for how to connect the 2 are present in the drupal module's documentation.

Basically to connect the 2 you first setup the oAuth server connection in your drupal, with the proper permissions ("Use OAuth2 Server" => "Anonymous User" = Checked).

In the Rocket chat you have to do the following:

• fill in the 'Client ID'.
  Bear in mind that the Client ID should not be guessable,but is seen in the URL when doing the login.
• fill in the 'Client Secret'. This should be treated as a Secret Key (like the Secret Key of a TLS certificate). it must not be guesable or derivable, and is best a Alphanumerical sequence between 16 and 48 cahracters long (longer would be better but longer than 48 characters can be problem with long URI's)
• fill in the Drupal's BaseURL.
• on the Drupal use the "Restrict redirect URIs" Setting to limit possible exploits. and set the Redirect URI's to whatever is in the Callback URL (like https://Rocketchat.example.com/_oauth/drupal and possibly also the https://Rocketchat.example.com/_oauth/drupal?close URI.).
• Lastly do not forget to Enable the Drupal OAuth and SAVE CHANGES.

When all is a Blue Button with a drupal like logo will apear on the login page of Rocket.Chat+