CanvasApiToolProvider.php

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<?php

namespace ceLTIc\LTI\ApiHook\canvas;

//
class CanvasApiToolProvider extends \ceLTIc\LTI\ApiHook\ApiToolProvider
{

    public function getUserId()
    {
        $userId = '';
        $messageParameters = $this->toolProvider->getMessageParameters();
        if (isset($messageParameters['custom_canvas_user_id'])) {
            $userId = trim($messageParameters['custom_canvas_user_id']);
        }

        return $userId;
    }

}