etsy-1.0.0-alpha3/src/Provider/EtsyProvider.php

<?php
namespace Drupal\etsy\Provider;

use League\OAuth2\Client\Provider\AbstractProvider;
use League\OAuth2\Client\Provider\GenericProvider;

class EtsyProvider extends GenericProvider {

  protected function getAuthorizationParameters(array $options) {
    if (empty($options['state'])) {
      $options['state'] = $this->getRandomState();
    }

    if (empty($options['scope'])) {
      $options['scope'] = $this->getDefaultScopes();
    }

    $options += [
      'response_type'   => 'code',
      'approval_prompt' => 'auto'
    ];

    if (is_array($options['scope'])) {
      $separator = $this->getScopeSeparator();
      $options['scope'] = implode($separator, $options['scope']);
    }

    // Store the state as it may need to be accessed later on.
    $this->state = $options['state'];

    $pkceMethod = $this->getPkceMethod();

    if (!empty($pkceMethod)) {
      if ($pkceMethod === AbstractProvider::PKCE_METHOD_S256) {
        $options['code_challenge'] = trim(
          strtr(
            base64_encode(hash('sha256', $this->pkceCode, true)),
            '+/',
            '-_'
          ),
          '='
        );
      } elseif ($pkceMethod === AbstractProvider::PKCE_METHOD_PLAIN) {
        $options['code_challenge'] = $this->pkceCode;
      } else {
        throw new InvalidArgumentException('Unknown PKCE method "' . $pkceMethod . '".');
      }
      $options['code_challenge_method'] = $pkceMethod;
    }

    // Business code layer might set a different redirect_uri parameter
    // depending on the context, leave it as-is
    if (!isset($options['redirect_uri'])) {
      $options['redirect_uri'] = $this->redirectUri;
    }

    $options['client_id'] = $this->clientId;

    return $options;
  }
}