Slack Oauth integration with adam-paterson/oauth2-slack - php

Question

I am trying to use the Admin-paterson oauth library for PHP to connect to slack
(https://github.com/adam-paterson/oauth2-slack)
When I run the sample code:
include("slack-vendor/autoload.php");
include("slacker/src/Provider/Slack.php");
$provider = new \AdamPaterson\OAuth2\Client\Provider\Slack([
'clientId' => $$slackid,
'clientSecret' => $slacksecret,
'redirectUri' => $returnURL,
]);
if (!isset($_GET['code'])) {
// If we don't have an authorization code then get one
$authUrl = $provider->getAuthorizationUrl();
$_SESSION['oauth2state'] = $provider->getState();
header('Location: '.$authUrl);
exit;
// Check given state against previously stored one to mitigate CSRF attack
} elseif (empty($_GET['state']) || ($_GET['state'] !== $_SESSION['oauth2state'])) {
unset($_SESSION['oauth2state']);
exit('Invalid state');
} else {
// Try to get an access token (using the authorization code grant)
$token = $provider->getAccessToken('authorization_code', [
'code' => $_GET['code']
]);
// Optional: Now you have a token you can look up a users profile data
try {
// We got an access token, let's now get the user's details
$team = $provider->getResourceOwner($token);
// Use these details to create a new profile
printf('Hello %s!', $team->getName());
} catch (Exception $e) {
// Failed to get user details
exit('Oh dear...');
}
// Use this to interact with an API on the users behalf
echo $token->getToken();
}
I get an error back from slack saying :
Invalid permissions requested
Requested scopes cannot be blank
I tried adding a "scope" to the call like this:
$provider = new \AdamPaterson\OAuth2\Client\Provider\Slack([
'clientId' => $slackid,
'clientSecret' => $slacksecret,
'redirectUri' => $returnURL,
'scope' => 'channels:write,groups:write,team:read'
]);
but it still returns the same error.
When I look at the url the scope field is blank
what do I need to do to send scope to the server?

Answer 1

Add your scope in getAuthorizationUrl() method like this
$authUrl = $provider->getAuthorizationUrl([
'scope' => 'channels:write'
]);

Answer 2

use the scope as defined in https://api.slack.com/apps/ in your App, under OAuth, e.g. 'scope' => 'users.profile:read'