Added Guzzle proxy

src/AuthmanGuzzleClientProxy.php

@@ -0,0 +1,68 @@
+<?php
+
+declare(strict_types = 1);
+
+namespace Drupal\authman;
+
+use Drupal\authman\AuthmanInstance\AuthmanOauthInstanceInterface;
+use GuzzleHttp\ClientInterface;
+use Psr\Http\Message\RequestInterface;
+
+/**
+ * Constructs a Guzzle client proxy for Authman.
+ */
+class AuthmanGuzzleClientProxy implements ClientInterface {
+
+  /**
+   * The authman instance.
+   *
+   * @var \Drupal\authman\AuthmanInstance\AuthmanOauthInstanceInterface
+   */
+  protected $authmanInstance;
+
+  /**
+   * Constructs a AuthmanGuzzleClientProxy.
+   *
+   * @param \Drupal\authman\AuthmanInstance\AuthmanOauthInstanceInterface $authmanInstance
+   *   An authman instance.
+   */
+  public function __construct(AuthmanOauthInstanceInterface $authmanInstance) {
+    $this->authmanInstance = $authmanInstance;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function send(RequestInterface $request, array $options = []) {
+    return $this->authmanInstance->authenticatedRequest($request->getMethod(), (string) $request->getUri(), $options);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function sendAsync(RequestInterface $request, array $options = []) {
+    throw new \BadMethodCallException();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function request($method, $uri, array $options = []) {
+    throw new \BadMethodCallException();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function requestAsync($method, $uri, array $options = []) {
+    throw new \BadMethodCallException();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConfig($option = NULL) {
+    return $this->authmanInstance->getProvider()->getHttpClient()->getConfig($option);
+  }
+
+}