How to use GuzzleHttp as a Tumblr client.

AppController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use GuzzleHttp\Client;
use GuzzleHttp\HandlerStack;
use GuzzleHttp\Exception\ClientException;
use GuzzleHttp\Subscriber\Oauth\Oauth1 as OAuth;

use App\Http\Controllers\Controller;

class AppController extends Controller
{
    public function __construct(Request $request)
    {
        $this->request = $request;
    }

    /**
     * Display a listing of the resource.
     *
     * @return Response
     */
    public function getAuthorize()
    {
        $stack = HandlerStack::create();

        $middleware = new OAuth([
            'consumer_key' => env('TUMBLR_CONSUMER_KEY'),
            'consumer_secret' => env('TUMBLR_CONSUMER_SECRET'),
            'token' => '',
            'token_secret' => '',
        ]);

        $stack->push($middleware);

        $client = new Client([
            'base_uri' => 'https://www.tumblr.com/oauth/',
            'handler' => $stack,
            'auth' => 'oauth',
        ]);

        $response = $client->post('request_token', [
            'form_params' => ['oauth_callback' => route('app.authorized')],
        ]);

        parse_str((string) $response->getBody(), $tokens);

        foreach (['oauth_token', 'oauth_token_secret'] as $token) {
            $this->request->session()->flash($token, $tokens[$token]);
        }

        return view('app.authorize')->with('oauthToken', $tokens['oauth_token']);
    }

    public function getAuthorized()
    {
        $stack = HandlerStack::create();

        $middleware = new OAuth([
            'consumer_key' => env('TUMBLR_CONSUMER_KEY'),
            'consumer_secret' => env('TUMBLR_CONSUMER_SECRET'),
            'token' => $this->request->session()->get('oauth_token'),
            'token_secret' => $this->request->session()->get('oauth_token_secret'),
        ]);

        $stack->push($middleware);

        $client = new Client([
            'base_uri' => 'https://www.tumblr.com/oauth/',
            'handler' => $stack,
            'auth' => 'oauth',
        ]);

        try {
            $response = $client->post('access_token', [
                'form_params' => [
                    'oauth_verifier' => $this->request->input('oauth_verifier'),
                ],
            ]);
        } catch (ClientException $e) {
            return view('app.unauthorized');
        }

        parse_str((string) $response->getBody(), $tokens);

        dd($tokens);
    }
}